Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PostDocs : selection by topics

Engineering science >> Mechanics, energetics, process engineering
122 proposition(s).

Simulation of semimetal nanowires

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-11-2017

PsD-DRT-18-0004

jean-pierre.colinge@cea.fr

The candidate's mission will be: ? Simulation using ab-initio tools of the structure of bismuth nanowire bands of different diameters (from 1 nm to 10 nm). ? Extraction of parameters as effective masses, density of states, band offsets for these nanowires. ? Implementation of these parameters in a NEGF simulator to simulate bismuth nanowire transistors with variable diameter. ? Ab-initio simulation of the bismuth-dielectric nanowire interface and study of various elements of chemical passivation. ? This work will be done in collaboration with LETI / DCOS / SCME / LSIM (Philippe Blaise) ? The candidate will interact with an experimental team that will produce the simulated devices and will help to supervise one or more doctoral students, in collaboration with IMEP. ? The candidate will interact with the LTM to help predict the properties of the grid bismuth-insulator interface and implement the IMEP results in the simulator.

Large scale visual recognition

Département Intelligence Ambiante et Systèmes Interactifs (LIST)

Vision & Ingénierie des Contenus (SAC)

01-01-2013

PsD-DRT-13-0008

herve.le-borgne@cea.fr

This post-doc deals with detection and recognition of objects in images and video streams, on a large scale. This is a fundamental task that is the subject of active research in the world, including recent challenges in the evaluation campaigns. The "large scale" aspect refer to both large size databases (eg ten million images) and large number of concepts to recognize (eg 100-10000).The work will concern bothimage description and classification. At the description level, state of the art techniques rely on local descriptors, aggregated according to dictionaries of "visual words" possibly constructed using Fisher kernels. It is nevertheless necessary to recode these signatures effectively in order to manage large databases. Regarding learning of visual concepts or objects, many algorithms use SVM (support vector machines) but other approaches are sometimes considered, such as those based on boosting or logistic regression. The proposed position involves research and development of efficient algorithms to find visual entities in very large databases. Tracks are considered and should be discussed with the candidate selected based on prior knowledge and technical discussions.

Electric field and ab initio simulations, application to RRAM

Département Composants Silicium (LETI)

Laboratoire de Simulation et Modélisation

01-01-2016

PsD-DRT-16-0009

philippe.blaise@cea.fr

Since several years, LETI/DCOS is engaged in a simulation effort of microscopic phenomena at the heart of oxide-based RRAM operation (made of HfO2, Ta2O5, Al2O3). The correct description of an external electric field applied to a MIM device (Metal-Insulator-Metal) is now possible thanks to two methods one by an orbital separation approach [1] the other by using the non equilibrium green function formalism [2]. In this work, we propose to develop and to handle these methods by combining already existing simulation approaches. The main goal is to study the degradation mechanisms of an oxide by following the oxygen atoms movements coupled directly to the applied external electric field. These mechanisms are not known and this study will support the optimization and characterization efforts already engaged at LETI on RRAM functional prototypes. The targeted simulations tools are SIESTA for the DFT part, and TB_SIM for the electronic transport part. [1] S. Kasamatsu et al., « First principle calculation of charged capacitors under open-circuit using the orbital separation approach, PRB 92, 115124 (2015) [2] M. Brandbyge et al., « Density functional method for nonequilibrium electron transport », PRB 65, 165401 (2002)

Design for reliability for digital circuits

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Fiabilité et Intégration Capteur

01-03-2018

PsD-DRT-18-0010

valentin.gherman@cea.fr

Flash memories are a key enabler for high-temperature applications such as data acquisition and engine control in aerospace, automotive and drilling industries. Unfortunately, the retention time of flash memories is very sensitive to high temperatures. Even at relatively moderated temperatures, flash memories may be affected by retention-related problems especially if they are set to store more than one bit per cell. This impact can be mitigated by periodically refreshing the stored data. The problem is that, in the presence of a variable operating temperature that could be due to variable environmental and workload conditions, a fixed data-refresh frequency may become disproportionately large with a subsequent impact on response time and cycling endurance. The first objective of this project is to implement a data-refresh method based on a specially designed counter that is able to (a) track the evolution of the temperature and its impact on the data retention time of Flash memory blocks, (b) trigger warnings against potential retention time hazards and (c) provide timestamps. The second objective is to find the distribution law that gives the evolution of the number of data retention errors in time. The goal is to implement a methodology able to infer the remaining retention time of flash memory pages based on their data retention age, i.e., the elapsed time since data was stored, and the number of retention and non-retention errors. The publication of the scientific results in high-ranked conferences and journals is major project objective.

Frequency tunable elastic plate wave resonators and filters

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-03-2017

PsD-DRT-17-0011

alexandre.reinhardt@cea.fr

The increasing number of frequency bands having to be dealt with in mobile phone systems require a huge number of band pass filters in such systems. In this context, the capability to provide frequency tunable resonators and filters is seen as a key enabling element in future wireless transmission systems. CEA-LETI has been working for more than 10 years on the development of resonators and filters exploiting the propagation of guided elastic waves in piezoelectric thin films. It has also proposed several concepts for frequency agile resonators and filters. The purpose of this post-doc will be to further develop these ideas and to apply them to the design of demonstrators matching realistic specifications. In collaboration with the other member of the project team, more focused on fabrication in clean rooms, the candidate will propose innovative structures demonstrating frequency tuning of reconfigurability, and will take in charge their electrical characterization.

Design / Technology Co-Optimization of SRAM and standard cells on stacked nanowires at the 5nm technology node

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Dispositifs Innovants

01-02-2017

PsD-DRT-17-0013

francois.andrieu@cea.fr

The post-doctoral position will focus on the layout of SRAM and standard cells dedicated to the 5nm node on stacked nanowires integrating a Direct Self-Assembly solution (DSA). He/she will use the SPICE model developed at LETI and interact with both model and process/integration teams to find the best layout for a set of cells.

Compressed Sensing Electron Tomography: Quantitative Multi-dimensional Characterization of Nanomaterials

Département Technologies Silicium (LETI)

Autre laboratoire

01-01-2019

PsD-DRT-19-0015

zineb.saghi@cea.fr

Electron tomography (ET) is a well-established technique for the 3D morphological characterization at the nanoscale. ET applied to spectroscopic modes for 3D structural and chemical analysis has become a hot topic but necessitates long exposure times and high beam currents. In this project, we will explore advanced compressed sensing (CS) approaches in order to improve the resolution of spectroscopic ET and reduce significantly the dose. More precisely, we will focus on the following two tasks: 1. Comparison of total variation minimization, orthogonal or undecimated wavelets, 3D curvelets or ridgelets and shearlets for nano-objects with different structures/textures; 2. Comparison of PCA and novel CS-inspired methods such as sparse PCA for dimensionality reduction and spectral un-mixing. The code will be written in Python, using Hyperspy (hyperspy.org) and PySAP (https://github.com/CEA-COSMIC/pysap) libraries. The project follows a multidisciplinary approach that involves the strong expertise of the coordinator in ET and the input of two collaborators with complementary skills: Philippe Ciuciu with expertise in MRI (DRF/Joliot/NEUROSPIN/Parietal) and Jean-Luc Starck with expertise in cosmology, signal processing and applied maths (DRF/IRFU/DAP/CosmoStat). The three communities share a strong interest in compressed sensing algorithms.

Investigation of the reliability of Resistive RAMs for high density memories application

Département Composants Silicium (LETI)

Laboratoire de Composants Mémoires

01-03-2016

PsD-DRT-16-0016

gabriel.molas@cea.fr

In this postdoc, we propose to investigate Resistive memories (RRAM) as a Storage Class Memory (SCM) for high density memory applications. To this aim, both CBRAM and OXRAM will be studied and compared. RRAM technologies, integrating various resistive layers, top and bottom electrodes will be integrated. Then electrical characterization will be performed on these different memory options. The impact of the integration flow on the memory characteristics will be addressed, to evaluate how critical integration steps may impact the memory operation. In particular, MESA (the RRAM stack is etched) vs Damascene (the RRAM stack is deposited in a cavity) approaches will be compared. After the evaluation of the memory basic operation (forming, SET and RESET operation speed, required voltages?), a specific focus will be made on reliability. In particular, endurance will be deeply investigated and optimized. The impact of SET RESET conditions (including smart programming schemes) on the window margin and number of cycles will be analyzed. Finally, the variability issue will be highly covered, in order to quantify how cycle to cycle and device to device variability close the window margin of the RRAM. Specific reliability concerns (read noise?) will also be addressed. Extrapolations on the maximum density a given RRAM technology can reach will be drawn. Based on this detailed study, a benchmark of all the tested RRAM technologies will be made, to identify the pros and cons of each option, and highlight the tradeoff that have to be found (among them: memory speed, endurance, operating voltages, consumption?).

Optimisation of the monolithic cascode device based on GaN/Si MOS-Channel HEMT technology

Département Composants Silicium (LETI)

Laboratoire Composants Electroniques pour l'Energie

01-02-2017

PsD-DRT-17-0017

erwan.morvan@cea.fr

In order to adress the requirements of power conversion in the field of electrical vehicule or photovoltaics, high performance GaN on Silicon power devices need to be developped. Such power devices must fulfill agressive specifications in terms of threshold voltage (> 2V), nominal current (100-200A), breakdown voltage (650 and 1200V) and stability (low "current collapse", low hysteresis). Discrete cascode configuration, consisting in a combination of a low voltage E-mode Silicon die and a hihg voltage D-mode GaN/Si die in a single package, has been developped by different laboratories and companies to adress this need (Transphorm, On-Semi, NXP, IR?). However, this approach has some drawbacks like parasitic inductances, device pairing, need of additionnal protection devices, cost, temperature limitation due to the Si die... The monolithic cascode is a very compact version of the cascode configuration that will allow to avoid those problems but also to improve the performance of E-mode devices developped at Leti (MOS-channel HEMT). Indeed, some actors in the field of GaN power devices already use this configuration with another E-mode technology (p-GaN gate). Monolithic cascode device has been demonstrated recently by CEA-Leti in the frame of a PhD thesis (2014-2016) on the basis of the 200mm GaN/Si, CMOS compatible, MOS-channel HEMT technology. The aim of this post-doc is to optimize the monolithic cascode structure in terms of On-state resistance, Figure Of Merit, switching losses and high switching frequency capability in order to meet the specifications of our industrial partners.

3D Imaging with X-ray backscattering and fluorescence for applications in additive manufacturing

Département Imagerie Simulation pour le Contrôle (LIST)

Laboratoire Instrumentation et Capteurs

01-01-2018

PsD-DRT-18-0018

Marius.Costin@cea.fr

The department of imaging and simulation for non-destructive testing (DISC) at CEA Tech develops adapted inspection methods through advanced algorithms used with commercial or in-house devices. Techniques such as ultrasound, eddy current, radiography and tomography are used. In the framework of an inter-laboratory project, we aim to develop a 3D imaging system of industrial metallic samples using backscattering and X-ray fluorescence techniques. The system will be dedicated to the detection of surface and sub-surface defaults (cracks, porosity, etc.) inside very attenuating or complex geometry pieces which cannot be controlled using standard transmission X-ray imaging. We propose a post-doctoral position of one year to work on this project, to prepare and integrate the system which will target a prototype level. This includes several aspects, from design of the system, instrumentation to signal and image processing. The design and implementation of the 3D imaging system will require simulation, experimentation and programming. The prototype will consist of an X-ray generator, a bi-dimensional spectral camera and a mechanical device to perform surface scans over areas of few tens of square centimetres. A dedicated CALISTE micro-camera developed in the IRFU institute of the CEA will be specially designed for the project. This new micro-camera will have to be qualified before its integration into the device. With the help of simulation tools, the optimal characteristics will be defined and for the integrated system a special collimator will have to be designed and fabricated. The micro-camera will have to be interfaced with the mechanical system performing the scan and with the signal processing functions. The output will be a 3D cartography of the inspected are of the sample.

New packaging for power electronics : application to SiC components

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire de Substrats Avancés

01-01-2016

PsD-DRT-16-0019

julie.widiez@cea.fr

In continuity of ongoing work (PhD thesis) on the 3D assembly of vertical Silicon power components, the purpose of the post-doc proposal is to develop a similar assembly on vertical wide-gap SiC power components. The required work will be to define the components (high frequency / high voltage) with the supplier and to adapt them to the best vertical integration (Cu finishing, topology,...), to adjust the metal leadframe design for the 3D assembly, and to develop the transfer layer technology adapted to this new material. The candidate will also take care of the electrical characterizations of the final stack to validate the interest of this 3D packaging on wide-gap power devices.

Design of a new generation of MEMS flow or viscosity sensors

Département Composants Silicium (LETI)

Laboratoire Composants Micro-Capteurs

PsD-DRT-13-0020

caroline.coutier@cea.fr

This Post-doc is defined to answer to various industrial requests for flow sensors and viscosity sensors working on a large range, low cost and able to measure different kind of fluids (liquid or gas). The objective of this post-doc is to consider the design of a new generation of MEMS sensor for measuring flow or viscosity of any fluid that meets the specifications provided by the industry. In particular, the possibilities of using a 3-axis micro-force sensor developed in the laboratory will be explored by exploiting the drag force or the tangential stresses near the walls of the pipes. Different cases will have to be evaluated depending on the flow dynamics of the different fluids. A modeling and sizing of the sensor will have to be developed to determine the interactions with the fluids and the characteristics of the forces in the different flow rates. The candidate should possess strong knowledge on fluidic and microsystems.

Strain engineering on AlN thin films

Département Technologies Silicium (LETI)

Laboratoire

01-01-2019

PsD-DRT-19-0023

pierre.montmeat@cea.fr

AlN is one of the prime material due to its outstanding piezoelectric properties for many RF and MEMS applications. The performances of the devices strongly depend on the piezoelectric properties of the material and one promissing way to tune the properties is to set a mechanical strain to the AlN. The goal of the post-doctoral position is to strain AlN thin film by transferring them onto various substrates. In the case of flexible polymer substrate, the strain of the polymer can stress AlN. LETI has ever developed a process dedicated to the transfer of very thin silicon film onto a flexible substrate. the student will be in charge of : 1/ the transfer of AlN thin onto various substrates 2/ The mechanical and electrical characterization of the transfered films

Microfluidic cell encapsulation

Département Microtechnologies pour la Biologie et la Santé (LETI)

Laboratoire Biologie et Architecture Microfluidiques

01-02-2015

PsD-DRT-15-0024

Luis-miguel.FIDALGO@cea.fr

The Laboratory of Biology and Microfluidic Architecture is looking for a candidate to establish a new class of microfluidic devices for cell encapsulation using robust, industry-compatible materials. The laboratory is located in the Microtechnologies for Biology and Healthcare Division of LETI, focused on the development of micro and nanotechnologies for applications in the fields of medical imaging, security, in-vitro diagnostic, nanomedicine, medical devices and environment monitoring. LETI is a research institution focused on creating value and innovation through technology transfer to its industrial partners. It specializes in nanotechnologies and their applications, from wireless devices and systems, to biology, healthcare and photonics.

Engineer in Chemical Engineering on hydrogenation/dehydrogenation of LOHC (Liquid Organic Hydrogen Carrier)

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire de Nanocaractérisation et Nanosécurité

01-02-2019

PsD-DRT-19-0025

vincent.faucheux@cea.fr

Hydrogen could represent the best way to transport energy as long as it is produced from renewables energies and stored/transported safely and at low cost. A way to fix hydrogen consists of using organic molecules such as LOHC (Liquid Organic Hydrogen Carrier). Indeed, LOHC have H2 contents à room and pressure temperatures which can be upper than for H2 under pressure. These unsaturated molecules directly react with H2 in the presence of a catalyst. Thus, the transit of H2 consist simply in the transport of a liquid. Dehydrogenation is then realized where the hydrogen is needed. Nevertheless, the energetic cost to dehydrogenize these molecules constitute the lock to the emergence of this technology. The goal of this work consists to determine the best triplet LOHC molecule/catalyst/catalyst support and to improve the interfaces LOHC molecule/catalyst and catalyst/catalyst support to decrease the reaction temperature, improve the heat and mass (liquid-gas) transfers, improve the dehydrogenation kinetics, and at the end, decrease the energy necessary to the reaction. This work implies the choice of a molecule with all the criteria of performances, the determination of an optimum catalytic support in term of porosity, thermal and electrical conductivity (from a thermo-fluidic modelling), the choice of a catalyst (bibliographic study) and its deposition, and then the validation of the models and subsets through experimental measurements. This optimisation will include the realization of a catalytic system (catalyst and support) in relation with a LOHC molecule.

Ultra Low Power RF Communication Circuit and System Design for Wake-Up Radio

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Architectures Intégrées Radiofréquences

01-01-2019

PsD-DRT-19-0026

dominique.morche@cea.fr

Today, there is a strong demand in developing new autonomous Wake-Up radio systems with tunable performances and independent clocking system. The objectives of the proposed contract it to exploit the capacity of CMOS FD-SOI technologies to develop such devices, improving power consumption and RF performance above the state of the art, thanks to the natural low parasitic and tuning capacity through back biasing of the FD-SOI . A particular attention will be paid to the development of a new power efficient, fast settling, frequency synthesis system. The chosen candidate will be involved both in RF system and circuit design, with the support of the experienced RF System & Design team.

Development of a mechanical energy harvester based on a rotating machine architecture with permanent magnets

Département Systèmes

Laboratoire Autonomie et Intégration des Capteurs

01-03-2017

PsD-DRT-17-0027

sebastien.boisseau@cea.fr

This Post-doc offer will be aimed at developing energy harvesters, and more especially electromagnetic energy harvesters with an operation mode close to the one of rotating machines with permanent magnets. The post-doc applicant will have a background in electrical engineering and an experience in rotating machines design, ideally, with permanent magnets. The missions of the Post-doc applicant will be to: 1) Imagine and design small-scale innovative energy harvesters by exploiting the techniques used in rotating machines. 2) Model and optimize the devices 3) Characterize the systems 4) Participate to the industrialization process

Innovative modeling for technology-design-system co-optimization

Département Composants Silicium (LETI)

Laboratoire de Simulation et Modélisation

01-01-2019

PsD-DRT-19-0028

luca.lucci@cea.fr

The post-DOC will support the device modeling part of a research project investigating new methodologies for system and circuit optimization with the aim of achieving a better integration between the knowledge of the detailed characteristics of a specific technology, the circuit-design methodology and the system architecture. The practical goal is to leverage the existing multi-disciplinary know-how for benchmarking of system and technologies to advance the analysis past the usual PPA, PPAY and PPAC approaches that are commonly deployed in such cases. In more detail, the post-DOC will develop "pre"-spice models for actives and passives which will constitute the basic bricks for the optimization methodology developed in the overall project. Active device modeling will have a starting point in the works of EPFL based on the analytical expression of invariants such has the inversion coefficient.

Active medical implants encapsulated using hermetic glass package

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Hétérogène

01-02-2015

PsD-DRT-15-0030

baptiste.goubault@cea.fr

Microelectronics extends its range of applications via the micro-systems with high level of integration including sensors, energy scavenger, and communication modules. Medical implants such as pacemakers and defibrillators medical implants, drug dispensers, intra-cranial probes are many possible applications for these modules. The use of glass offers a wide field of investigation. Moreover, recent innovations for the glass material (interconnections, thinning, and functionalization) reinforce its relevance to the medical field: biocompatibility, stability, transparency, and potentially lower cost. The objective of this work is to design and validate technological steps to integrate high level of microsystems encapsulated in glass material.

Characterization and Modeling of epitaxial leakage current and trapping effects in GaN on Si substrates

Département Composants Silicium (LETI)

Laboratoire de Caractérisation et Test Electrique

01-03-2019

PsD-DRT-19-0031

william.vandendaele@cea.fr

Understand and model the leakage current in the epitaxial structure as well as the trapping effects in GaN on Si substrates remain critical to optimize efficiently the final device (HEMT or Diode) dynamic behavior. Current collapse, OFF state and Breakdown voltage are directly related to the quality of the GaN on Si substrate. Up to now, only partial explanation of the leakage mechanims are reported and hardly modeled. Plus the direct correlation between current collapse and substrate leakage is not so obvious. The postdoctoral position will consist on : Advanced electrical characterization (IV, I(t), Susbtrate ramping, C(V)...) at different temperature and illumination conditions will be performed on epitaxial layers or final devices. Extracted parameters and data will be analyzed thouroughly to deduce the predominant condutction mechanisms in the different layers of the epitaxial stack. TCAD modeling will be used to fit experimental data thanks to relevant extrated parameters.

Design of pancreas on a chip

Département Microtechnologies pour la Biologie et la Santé (LETI)

Laboratoire Biologie et Architecture Microfluidiques

01-01-2018

PsD-DRT-19-0032

fabrice.navarro@cea.fr

In the last decade, the organs-on-a-chip represent a new topic of a great interest, at the crossroads of the disciplines between cell biology and microfluidics. Biological functions have been mimicked on microfluidic chips. New generations of microfluidic chips are being developed, integrating greater biological complexity by cultivating 3D structures as well as several biological functions and real-time monitoring of them. The subject we are proposing is the development of an instrumented microfluidic chip to cultivate pancreatic islets in the long term and monitor their functionality. The post doc will have to work in close collaboration with several collaborators and other post docs on this interdisciplinary topic.

Detection of small particules in the environment with nanomechanical resonators

Département Composants Silicium (LETI)

Laboratoire Composants Micro-Capteurs

01-06-2019

PsD-DRT-19-0033

sebastien.hentz@cea.fr

Today, there are solutions for detecting and quantifying PM10 and PM2.5 type particles (10 and 2.5µm diameter); their reliability depends essentially on their cost. These solutions are essentially optical, and they must be improved for particles down to a micron. For even smaller particles that are even more dangerous to health, there does not seem to be an obvious solution today. Nanomechanical resonators perform very well in these size / mass ranges, as demonstrated by our recent results obtained with our system for biological objects in liquid, recently published by the journal Science (http://science.sciencemag.org/content/ 362/6417/918). These nanoresonators therefore appear as a promising technology for the detection of PM especially for certain applications of air quality control in real time. It will therefore be necessary to study the possibility of detecting particles in the air, in particular those which are hardly detectable today (PM <0.5). We will rely very largely on the systems developed for the detection of biological particles in liquid medium. It will be a question of taking advantage of this know-how and of adapting the system architectures, but also the nanomechanical resonators themselves for the detection of particles in aerosol. We will target representative nanoparticles, organic, pathogenic or non-pathogenic. In terms of resonators, we will also take advantage of current fabrications, with specific designs (electrical or optomechanical) for this application. We will particularly study the possibility of preventing fouling problems. The candidate will be fully integrated into the team around mass detection with nanoresonators.

Sizing and control optimisation of a hydrogen production system coupled with an offshore wind farm

DPLOIRE (CTReg)

Autre

01-03-2018

PsD-DRT-18-0034

guenael.lesolliec@cea.fr

Coupling MRE (Marine Renewable Energy) and hydrogen sectors reveal an important potential long-term assets. The MHyWind project suggests to estimate the energetic and economic potential of a hydrogen production system integrated into a substation of an offshore wind farm. The hydrogen produced and stored locally will be distributed by boat for harbour uses, as a replacement of fossil fuels. For that purpose, it will be organized a simulation which will integrate all the energy chain towards the harbour uses of hydrogen. It will allow to estimate various configurations and sizing according to the local uses, valuation leverages, control modes and behavior of the system. The criteria will be the producible (kg of H2 producted and used) and complet costs (CAPEX and OPEX). The objective of the postdoctoral student will be to develop the simulation tool on this applicative being fully integrated with the teams of concerned laboratories.

Nanocomposite plastic scintillators: functionalization and dispersion of diamond nanoparticles in radioluminescent polymers

DM2I (LIST)

Laboratoire Capteurs et Architectures Electroniques

01-02-2019

PsD-DRT-19-0035

vesna.simic@cea.fr

The objective of this postdoctoral position concerns the synthesis and the characterization of novel radioluminescent nanocomposite polymers for the development of ionizing-radiation detectors more efficient than existing devices. To achieve this goal, we propose to incorporate sub-micron 2D resonant structures in conventional radioluminescent polymers (based on polystyrene and derivatives), in order to both improve the collection of scintillation photons and amplify their generation (effect Purcell). Nevertheless, this approach requires polymers with a higher optical index than standard materials. An effective way to increase the overall index of the material would be to introduce nano-objects with higher optical index into the polymer matrix. Diamond is the non-metallic material with the highest refractive index (2.42). It is also transparent in the visible and its surface chemistry easily lends itself to many functionalization routes. These criteria, together with their compatibility with the nanostructuration processes that will be implemented, make it a prime candidate for the doping of scintillating polymers.

Outgassing studies for advanced lithography

Département Technologies Silicium (LETI)

Laboratoire

01-01-2013

PsD-DRT-13-0036

philippe.michallon@cea.fr

This work address a "post doc" person. The frame work of this subject is a advanced lithography multifaisceaux Ebeam development project. Within this project framework, an multiEbeam tool is developed in a international partnership context. Strong contamination constraints of the projection optic are identified due to resists outgassing during theirs activations by electronic expositions. Layers contamination due to resists outgassing will be studied. The candidate will be in charge to carry out outgassing studies on various resist samples in support to the existing team and using Leti outgassing studies tool and characterization tools available on Leti (BEM, XPS, interferometer,...). Candidate will implement methodologies already developed in Leti (pumping speed, outgassed elements identification,...) and will make contribution to improvement all of these methods. It will also supervise realization of objects useful for outgassing studies(Ebeam projection optics simulator) which will be carried on Leti. The candidate will carry out electron beam characterization on the outgassing tool and could be force of proposal for improvement. He will also take charges characterization of contaminants layers. The candidate will evolved in advanced lithography context and will be in close collaboration with international teams. English is needed.

Design of a power integrated circuit using GaN on Si, characterization, implementation.

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

01-03-2017

PsD-DRT-17-0038

dominique.bergogne@cea.fr

The objective is to propose an innovative solution to supply low voltage electronics (3 to 12VDC) or to charge accumulators, using industrial alternating voltages (230VAC / 400VAC). This type of device should benefit greatly from the contribution of integrated passive technologies and the possibilities offered by the ASICs developed at Leti, in particular GaN ASICs. This research program is part of the Leti's 'power roadmap'. From the state of the art and concepts envisaged by CEA researchers, the post-doctoral student will have to imagine an original solution, to design it and then to characterize the prototype. The research program involves other academic partners, which allows the post-doctoral student to immerse himself in an upstream research context. An industrial application has been identified. The post-doctoral student will be encouraged to enrich the subject with additional functions in the control (regulation) at very high frequency, the transmission of isolated signals via the converter or any other proposals.

2D materials for Contacts and Gate stacks for advanced CMOS applications

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-06-2017

PsD-DRT-17-0039

louis.hutin@cea.fr

Transition Metal Dicalchogenides (TMDs) have displayed interesting properties in numerous fields of nanotechnoogy (CMOS, memory, sensors, photonics etc.), and emerge as promising materials thanks to their functional properties and potential for co-integration, facilitated by their intrinsic features (van der Waals materials). However, their applicative impact remains uncertain due to the challenge of developing their processing in a standard nanoelectronics environment while maintaining a good control of their fundamental properties. The candidate will quantify the electrical properties of various 2D materials in test structures derived from a silicon technology baseline (TLM, Cross-Bridge Kelvin Résistors, MOS capacitors), in order to provide guidelines for device prototyping. Specifically, the primary aim is to assess the interest of these materials as interface layers rather than for transport, for improving: - The contact resistivity via Fermi-level depinning. - Control by the Gate over the inversion charge in the channel via a negative differential capacitance effect.

Cryogenic Analog Front-End for Quantum Computing

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

01-02-2018

PsD-DRT-18-0041

gael.pillonnet@cea.fr

Quantum engineering is a rapidly evolving novel domain in device technology, boosted by the recent progress in semiconductor quantum bits (QuBits) and by the major opportunity to combine the quantum device with dedicated electronics of conventional CMOS technology working at low temperatures (= 4 K). The ultimate goal of the research related to the proposed post-doc will be the development of silicon-based systems containing many QuBits and versatile electronics based on mature industrial technology, in order to facilitate the massive introduction of quantum processors. Nowadays state-of-the-art experiments on low-temperature quantum devices use electronic components at room temperature, but the future development of integrating many QuBits together complicates the device control with the multiplication of data lines. Minimal power dissipation and noise characteristics will be the challenging key elements to control a large number of QuBits. At CEA Grenoble, we have developed the first semiconductor QuBit fully realized on a CMOS 300-mm foundry that uses the spins of holes in Si as quantum state. The subject of the post PhD is aimed to build the electronics needed nearby the QuBit at low temperatures, using industrial CMOS technology (FDSOI 28nm) compatible with Silicon Qubits. The post PhD will be asked to develop his competence in the quantum physics of QuBits, the modelling of transistor parameters at low temperatures, and the design and measurement of analogue electronics, with the main task in developing and testing CMOS circuitry at low temperatures.

Diamond membrane based microdosimetric system for radiation quality assurance in hadron therapy

DM2I (LIST)

Laboratoire Capteurs Diamants

01-03-2019

PsD-DRT-19-0042

michal.pomorski@cea.fr

The Diamond Sensors Laboratory of CEA-LIST has twenty years of experience in diamond material synthesis including R&D on diamond-based sensors and radiation-detection devices. The INSERM-funded (2018-2020) DIADEM collaboration proposes to develop a new tissue-equivalent diamond-based micro-dosimeter with associated electronics, to obtain precise measurements of lineal energy distributions in hadron-therapy clinical conditions with high rates and high spatial resolution. Interdisciplinary experimental techniques, such as nano- and microfabrication, device characterization under ion nuclear microprobes micro-electronic and electronic developments are going to be employed for diamond micro-dosimeter prototyping. The performance of final prototypes will be evaluated with clinical hadron beams leading to first step for the implementation in radiobiological numerical models. The position: ? MC simulations of clinical proton/carbon beams interactions with matter, to benchmark experimental response of the micro-dosimeter prototypes ? participation in beamtimes for devices testing with clinical beams and parcticle microbeams at accelerator facilities ? participation in fabrication process of the devices (surfaces preparation, thin layer deposition, photolithography) Requirements: ? PhD in physics/medical physics or equivalent ? knowledge of solid-state particle detectors, associated electronics and signal processing, possibly including some experience at accelerator facilities ? knowledge of relevant Monte Carlo simulation programs ? verbal and written communication in English (French would be additional asset) ? knowledge of simple printed circuit boards design and semiconductors simulation software would be an asset Conditions: A one-year postdoctoral contract starting preferably from March-April 2019. Salary and benefits are commensurate with those of CEA organization. Classification is based upon candidate's qualification and assigned duties.

Symbolic learning for processes optimization

DM2I (LIST)

Laboratoire d'Analyse des Données et d'Intelligence des Systèmes

01-03-2019

PsD-DRT-19-0045

laurence.boudet@cea.fr

In the context of a R&D platform on symbolic artificial intelligence (knowledge-based systems), we would like to develop machine-learning capacities. One of the interests of such systems is to be able to explain their decisions, in line with GDPR which is applicable from May 2018. After a bibliographic study, the candidate will propose and develop evolution of existing methods or a new one for rule induction in presence of numerical or symbolic (categorical) variables. These algorithms will be applied to the prediction of the link between physical parameters of material elaboration (temperature, pressure, etc.) and desired technical features (such as resistivity). Results obtained will be compared with other classical techniques of machine learning. Furthermore, inducted rules will be evaluated by experts in material elaboration. We will be able to answer to the question: Does AI approach generate new knowledge? Two other laboratories will provide data and will make experiments during the project. They will be available for describing their knowledge. Thus, machine-learning and knowledge-modeling approaches will be compared.

Development of flexible polymeric materials for in vivo dosimetry of complex beams used in radiotherapy

DM2I (LIST)

Laboratoire Capteurs et Architectures Electroniques

01-03-2019

PsD-DRT-19-0046

dominique.tromson@cea.fr

New treatment modalities as IMRT or stereotactic radiotherapy use very complex beams in order to improve the dose delivery to the tumor while sparing healthy tissues. In these treatment conditions patient radioprotection becomes a real challenge concerning the measurement of the dose delivered during the treatment. Despite the fact that in-vivo dosimetry became a legal obligation since 2011, there is still no existing device completely appropriate to perform accurate measurement for in-vivo dosimetry using such irradiation fields. The aim of this post-doctoral project is to develop an innovative dosimeter based on tissue-equivalent, flexible material in order to perform in-vivo dosimetry for complex irradiation techniques. The novelty of this project is based on the dosimeter composition, made from flexible composite material including polymers and colorant. The dosimeter response will be evaluated with ionising radiation and measured with absorption spectroscopy and RPE. A critical point will be the homogeneity and stability of the material after irradiation. The dosimeter will be validated by the evaluation of the dosimetric parameters. The incorporation of nanoparticles will be investigated as an option to increase the dosimeter sensitivity.

Tunnel Junction for UV LEDs: characterization and optimization

Département d'Optronique (LETI)

Laboratoire des Matériaux pour la photonique

01-09-2018

PsD-DRT-18-0047

guy.feuillet@cea.fr

Besides existing UV lamps, UV LEDs emitting in the UV-C region (around 265 nm) are considered as the next solutions for cost efficient water sterilization systems. But existing UV-C LEDs based on AlGaN wide band gap materials and related quantum well heterostructures still have low efficiencies which precludes their widespread use in industrial systems. Analysing the reasons of the low efficiencies of present UV-C LEDs led us to propose a solution based on the use of a Tunnel Junction (TJ) inserted within the AlGaN heterostructure diode. p+/ n+ tunnel junctions are smart solutions to cope with doping related problems in the wide band gap AlGaN materials but give rise to extra tunneling resistances that need to be coped with. The post-doctoral work is dedicated to understanding the physics of tunneling processes in the TJ itself for a better control of the tunneling current. The post-doctoral work will be carried out at the ?Plate-Forme de Nanocaractérization? in CEA/ Grenoble, using different optical, structural and electrical measurements on stand-alone TJs or on TJs inserted within LEDs. The candidate will have to interact strongly with the team in CNRS/CRHEA in Sophia Antipolis where epitaxial growth of the diodes will be undertaken. The work is part of a collaborative project named "DUVET" financed by the Agence Nationale de la Recherche (ANR).

Automatic driving of a finite element software based upon a domain decomposition strategy. Application to ultrasonic non-destructive testing.

Département Imagerie Simulation pour le Contrôle (LIST)

Laboratoire Simulation et Modélisation en Acoustique

01-05-2015

PsD-DRT-15-0048

alexandre.imperiale@cea.fr

One the most important field of activity at the DISC (Department of Imaging and Simulation for Control) of CEA - LIST is to provide a comprehensive set of tools for modeling and simulation for Non-Destructive Testing (NDT). These tools are gathered within the computational platform CIVA. Most of the ultrasound models -- elaborated by the LSMA (research laboratory for Simulation and Modeling in Acoustics) -- are based upon semi-analytical methods. Although very efficient, these methods suffer from a loss of precision as soon as some critical phenomena (e.g. head waves or caustics) or some particular features of the material (e.g. flaws or heterogeneities ) appear in the control experiment. To circumvent these limitations, one of the field of research in the LSMA is to build coupling schemes between semi-analytical and numerical methods. Following this strategy, a computational software based upon high-order finite elements combined with domain decomposition strategies is developped in order to address 3D configurations. The work proposed here focuses on increasing the complexity of the configurations reachable within this coupling strategy. A typical example being the fluid-structure interaction in the case of flaws reaching the bottom of the material to control.

Predictive design of heat management structures

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Thermoélectricité

01-06-2015

PsD-DRT-15-0050

natalio.mingo@cea.fr

Heat management is a paramount challenge in many cutting edge technologies, including new GaN electronic technology, turbine thermal coatings, resistive memories, or thermoelectrics. Further progress requires the help of accurate modeling tools that can predict the performance of new complex materials integrated in these increasingly demanding novel devices. However, there is currently no general predictive approach to tackle the complex multiscale modeling of heat flow through such nano and micro-structured systems. The state of the art, our predictive approach ?ShengBTE.org?, currently covers the electronic and atomistic scales, going directly from them to predict the macroscopic thermal conductivity of homogeneous bulk materials, but it does not tackle a mesoscopic structure. This project will extend this predictive approach into the mesoscale, enabling it to fully describe thermal transport from the electronic ab initio level, through the atomistic one, all the way into the mesoscopic structure level, within a single model. The project is a 6 partner effort with complementary fields of expertise, 3 academic and 3 from industry. The widened approach will be validated against an extensive range of test case scenarios, including carefully designed experimental measurements taken during the project. The project will deliver a professional multiscale software permitting, for the first time, the prediction of heat flux through complex structured materials of industrial interest. The performance of the modeling tool will be then demonstrated in an industrial setting, to design a new generation of substrates for power electronics based on innovating layered materials. This project is expected to have large impacts in a wide range of industrial applications, particularly in the rapidly evolving field of GaN based power electronics, and in all new technologies where thermal transport is a key issue.

Lensfree Cytometry for High-troughput biological analysis

Département Microtechnologies pour la Biologie et la Santé (LETI)

Laboratoire Imagerie et Systèmes d'Acquisition

01-05-2015

PsD-DRT-15-0051

cedric.allier@cea.fr

The new lensfree imaging is against the foot of the recent developments in microscopy that focuses today on super-resolution achievements. Instead lensfree imaging offers several advantages: field of view (FOV) can cover several cm2, resolution in the range of 0.5µm to 3µm, mostly compact sizes and ease of use. The technique is based on holography online as invented by Gabor [1]. A biological object is illuminated by a coherent light, micrometric structures of the object diffract and the light interferes with the incident wave. The amplitude of the interference is recorded by a CMOS sensor and the image is reconstructed thanks to inverse-problem approaches. Albeit the method exists since 1970, the recent development of large field, small pixel size digital sensors helped realize the full potential of this method only since 2010. At CEA-LETI Health Division, a new microscopic platform based on this principle has been developed. Its applicability for performing high-throughput monitoring of major cell functions such as cell-substrate adhesion, cell spreading, cell division, cell division orientation, cell migration, cell differentiation, and cell death have been demonstrated [2,3]. The new project proposed in this PostDoc is dealing with the development of an innovative lensfree cytometry setup aiming at high-throughput analysis of biological samples, e.g. cell counting, cell sorting, etc. The post-doctoral fellow will develop the instrumentation and methods and will conduct the experimentation and analysis of true biological samples.

3D sequential integration

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Dispositifs Innovants

01-01-2012

PsD-DRT-12-0052

perrine.batude@cea.fr

3D integration is currently under great investigation because it offers a solution to keep increasing transistor density while relaxing the constraint on the transistor's dimension and it eases the co integration of highly heterogeneous technologies compared to a planar scheme. 3D sequential integration offers the possibility of using the third-dimension potential: two stacked layers can be connected at the transistor scale. This contrasts with 3D parallel integration, which is limited to connecting blocks of a few thousand transistors. However, its implementation faces the challenge of being able to process a high performance top transistor at low temperature in order to preserve the bottom FET from any degradation, as the stacked FETs are fabricated sequentially.

Feasability study and development of models towards SPICE-simulation of silicon Qubit quantum circuits

Département Composants Silicium (LETI)

Laboratoire de Simulation et Modélisation

01-08-2019

PsD-DRT-18-0056

sebastien.martinie@cea.fr

The Compact / SPICE model is the link between the development of technological bricks and circuit design. The model purpose is to accurately reproduce the experimental characteristics essential to digital, analog and mixed circuit design. But today we need deeper investigation to set up the specifications of models for such device, in order to provide adequate tools to help circuit designers building up quantum circuits. The main challenge is to be able to describe the quantum behavior of this architecture. It will also be necessary to study if this behavior must be described via the physical quantities (eg electronic spin, energy level ...) or by logical quantities (quantum state, matrix of transformation, ...). It will also be necessary to take into account the compatibility between the mathematical formalism and the standard tools of compact modeling (through Verilog-A description). Following recent experimental research activities (between CEA and CNRS) concerning the first demonstration of hole spin qubit on SOI, we propose first to investigate how to model such device through macro modeling approach where SET compact model, inclusion of magnetic spin degeneracy and management of RF excitation are main steps. The challenges in regards to literature are inclusion of magnetic field in SET model, description of resonant tunneling, RF excitation of SET and reproduction of Rabi oscillations.

Development of a reference test surface for the characterization of surface contamination monitors under dismantling conditions

DM2I (LIST)

Laboratoire de Métrologie de l'Activité

01-05-2019

PsD-DRT-19-0057

valerie.lourenco@cea.fr

Decommissioning and dismantling operations are a major issue for the nuclear industry. They are characterized by a wide diversity of radioactivity measurement conditions (very broad range of surface activities, large areas to characterize, roughness of the walls, interference of the radiations to be measured). The CAPSUD project aims to address these issues through the development and characterization of an innovative measurement system: a wide area deformable and pixelated sensor. The performance of this prototype will be evaluated using a modular test surface (1 m²), characterized metrologically. The main objective of the post-doc is the realization of this reference test surface whose modularity also aims to mimic the actual conditions of measurement of dismantling sites. Several strategies are considered in order to find solutions adapted to each radiation constraint (spinking, electrodeposition, functionalization).

Measurement of magnetic Fields with nm-scale resolution in a TEM.

Département Technologies Silicium (LETI)

Autre laboratoire

01-03-2019

PsD-DRT-19-0058

david.cooper@cea.fr

In this project we will develop new methods of characterising magnetic fields with a view to act as an accelerator for the development of Spin Transfer Torque (STT) magnetic random access memories (MRAM) and future magnetic devices at LETI. Off-axis electron holography will be developed for the mapping of magnetic fields following the improvements in the technique implemented during the ERC project « Holoview ». As properties such as the thermal stability and magnetic switching characteristics are key to the success of these devices, methods to visualise the evolution of the magnetic fields in-situ in a transmission electron microscopy (TEM) will be developed. Different types of STT MRAM devices will be examined in the project including devices grown on Ta posts for ultra high density applications and perpendicular shape anisotropy which provides a gateway towards magnetic devices with diameters as low as 4 nm.

AlGaN/GaN HEMTs transfert for enhanced electrical and thermal performances

Département Composants Silicium (LETI)

Laboratoire Intégration et Transfert de Film

01-04-2018

PsD-DRT-18-0060

julie.widiez@cea.fr

Due to their large critical electric field and high electron mobility, gallium nitride (GaN) based devices emerge as credible candidates for power electronic applications. In order to face the large market needs and benefit from available silicon manufacturing facilities, the current trend is to fabricate those devices, such as aluminum gallium nitride (AlGaN)/GaN high electron mobility transistors (HEMTs), directly on (111) silicon substrates. However, this pursuit of economic sustainability negatively affects device performances mainly because of self-heating effect inherent to silicon substrate use. New substrates with better thermal properties than silicon are desirable to improve thermal dissipation and enlarge the operating range at high performance. A Ph.D. student in the lab. has developed a method to replace the original silicon material with copper, starting from AlGaN/GaN HEMTs fabricated on silicon substrates. He has demonstrated the interest of the postponement of a GaN power HEMT on a copper metal base with respect to self heating without degrading the voltage resistance of the component. But there are still many points to study to improve the power components. Post-doc objectives : We propose to understand what is the best integration to eliminate self-heating and increase the voltage resistance of the initial AlGaN/GaN HEMT. The impact of the component transfer on the quality of the 2D gas will be analyzed. The same approach can be made if necessary on RF components. Different stacks will be made by the post-doc and he will be in charge of the electrical and thermal characterizations. Understanding the role of each part of the structure will be critical in choosing the final stack. This process will also be brought in larger dimensions. This post-doc will work if necessary in collaboration with different thesis students on power components.

Dual layer transfer of piezoelectric films for advanced RF devices

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire de Substrats Avancés

01-06-2013

PsD-DRT-13-0061

thomas.signamarcheix@cea.fr

The aim of these workds is to study and develop an innovating concept of piezoelectric thin films multilayer transfer for RF applications.The applicant will be responsible for the development of the entire fabrication sequence of these multilayer structures and of the 3D RF components. To this end, he or she must master the physical mechanisms involved in the film transfer technology and design the complete architecture through simulation of the expected RF filters properties. Once the structure is defined and the technology backbone is mastered, the candidate will collaborate with Leti technology experts to identify the necessary process developments. He or she will then ensure their implementation in the fabrication technology platform and support the achievement of the most critical steps. The development of this fabrication sequence will allow the generation of substrates whose features meet device specifications. The functionality of the substrates will then be demonstrated through the fabrication and characterization of RF devices that are relevant to the target applications.

Intégration CMOS à canal dual en technologie FDSOI : comparaison "enrichissement en Ge" vs. "Epitaxie localisée"

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Dispositifs Innovants

01-04-2012

PsD-DRT-12-0062

cyrille.leroyer@cea.fr

LETI is a major laboratory in the european microelectronics research, especially in the thin film FDSOI research (Fully Depleted). We propose innovative solutions for the next ITRS roadmap generations (sub 22nm), such as the integration of ultrathin Silicon-Germanium (SiGe) layers in the channel of p type transistors (in order to increase the hole mobility, and to adjust the threshold voltage of pMOSFETs). The first results show significative gains for hole mobilityy and Vth,p tunning (C. Le Royer et al. ESSDERC 2010, IEDM 2011) but also for basic circuits (L. Hutin et al. IEDM 2010). In order to further improve the Fully Depleted CMOS DualChannel integration, it is necessary to quantify in details the advantages and the possible drawbacks (form the process and from the electrical performance point of view). LETI wants to compare the two following approaches for SiGe based pMOSFETs (cointegrated with SOI nMOSFETs featuring 6nm body thickness): .SiGe/SOI hetrostructures ("Localized SiGe epi" on SOI) .SiGe-On-Insulator ("localized Ge enrichment" on SOI) Other issues have also to be considered such as the initial substrate (SOI, sSOI) or the Ge content in the SiGe layer?

Frequency reference oscillators for the 5G technology based on acoustic resonators

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-09-2019

PsD-DRT-19-0063

marc.sansaperna@cea.fr

Millimiter-wave 5G systems require increasing modulation complexities (beyond 64 QAM) as a means to improve data bandwidth, but they are currently limited by the phase noise of local oscillators. Current reference oscillators are based on quartz resonators, limited to frequencies of few MHz. There is therefore a need for high-performance and high-frequency alternatives. Reference oscillators based on acoustic-wave resonators represent a privileged alternative to attain good phase noise performance in the UHF band. In this context, the RF components laboratory of the CEA/Leti has a large experience in the design and fabrication of such devices, as demonstrated by its large scientific output and industrial collaborations. The post-doc will be centred on the development of high-performance acoustic resonators in the UHF band. The objective is to optimize phase noise and temperature stability of reference oscillators, two of the main defining parameters defining their performance. The candidate will be in charge of the design, fabrication and characterization of the acoustic resonators, and the development of strategies to improve their performance.

Département Thermique Biomasse et Hydrogène (LITEN)

Laboratoire Systèmes Solaires Haute Température

01-01-2015

PsD-DRT-14-0064

francois.boudehenn@cea.fr

Contribution to the development of miniature antennas measuring devices

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Antennes et Propagation

01-10-2014

PsD-DRT-14-0065

christophe.delaveaud@cea.fr

The generalization of RF links operating at VUHFfrequencies to equip an increasing number of communicating electronic devices helps to intensify research on miniaturization and integration of antennas. As a result, significant progress are regularly carried out to reduce the size of antennas and it is not uncommon to find work describing antenna structures of 1/30 of the wavelength maximum dimension. Increased sensitivity to the operating environment is observable with electrically small antennas. This feature is reflected by problems of measurement of electrical and radiation properties that may be altered with the standard techniques of connecting a measuring cable to the antenna. Accordingly, the subject seeks to develop techniques for electrically small antennas charterization using non-invasive methods, that is to say does not interfere (or few) under test antenna. Two techniques will be investigated based on the work already done in the laboratory. The first technique is based on the far field electromagnetic reflectometry. The second technique involves the use of an RF-optical transducer in the vicinity of the antenna under test for a particular design of miniature optic RF conversion reflectometer for measuring antenna impedance.

Development of flexible solar panels for space applications

Département des Technologies Solaires (LITEN)

Laboratoire Photovoltaïque à Concentration

01-04-2018

PsD-DRT-18-0066

philippe.voarino@cea.fr

Traditional solar panels used to power satellites can be bulky with heavy panels folded together using mechanical hinges. Smaller and lighter than traditional solar panels, flexible solar array consists of a flexible material containing photovoltaic cells to convert light into electricity. Being flexible, the solar array could roll or snap using carbon fiber composite booms to deploy solar panels without the aid of motors, making it lighter and less expensive than current solar array designs. On the other hand, satellite trends are shifting away from one-time stints and moving towards more regular use in a constellation setting. In the last years, the desire increased to mass-produce low-weight satellites. Photovoltaic arrays companies are challenged on their capacity to face these new needs in terms of production capacity and versatility. And this is exactly where space photovoltaics can learn from terrestrial photovoltaics where this mass production and low-cost shift occurred years ago. To tackle these new challenges, the Liten institute started to work on these topics two years ago. In the frame of this post-doc, we propose the candidate to work on the development of an innovative flexible solar panel architecture, using high throughput assembly processes. We are looking for a candidate with a strong experience in polymers and polymers processing, along with an experience in mechanics. A previous experience in photovoltaic will be greatly appreciated.

Selective removal of metal alloy for advanced silicidation applied to sub-20nm CMOS transistors

Département Technologies Silicium (LETI)

Laboratoire

01-10-2012

PsD-DRT-12-0070

virginie.loup@cea.fr

CMOS transistor performances depend on electrical contact resistivity reduction. Thus, self aligned silicidation (salicide) is one of the key processes which have to be improved to meet the ITRS requirements for the future technological nodes. Nowadays, solid state reaction between thin metal layer (Ni1-yPty < 10nm) and a silicon substrate allows to decrease access resistances of transistor source & drain. The metal is currently deposited by physical vapor deposition method all over the wafer surface. Under heat treatment, metal reacts preferably with semiconductor areas rather than dielectrics ones. Then, unreacted metal layer is selectively etched with an appropriate acidic solution; only metal silicide remains.As new specifications (use of ultra-thin Ni-alloy,very low temperature process leading to partial salicidation, use of various additive metals ...)are required for advanced nodes (C20nm & C14nm), the capability to chemically remove the excess of metal on dielectric areas has to be investigated. In the clean room environment of CEA-LETI (Grenoble, France), the candidate will work on innovative wet chemistries to remove selectively the different metallic layers (Ni, Pd, NiCo, NiPd?). In a first time preliminary test will be conducted on sample in manual tank in order to check removal kinetic and global selectivity on structures devices? Based on several characterization techniques (TXRF, XRR, AFM, SEM, TEM, XRD?), residual additive interaction with dielectric and chemical mixture behavior towards the metal rich phase on silicided area (roughness, resistivity) will be studied. Different semi-conductor (Si, SiGe?) and dielectrics surfaces (SiO2, SixNy?) will be investigated. Afterwards the most promising selective processes will be selected to be installed on a fully automatic 300mm tool. Finally, best processes will be integrated on critical patterned wafer architectures for morphological and electrical characterizations.

Nonlinear ultrasonic testing for the assessment of adhesive bonding properties

Département Imagerie Simulation pour le Contrôle (LIST)

Laboratoire CND pour les Applications Aéronautiques

01-09-2015

PsD-DRT-15-0072

damien.segur@cea.fr

The CEA-LIST carries out Non Destructive Testing (NDT) projects in partnership with various industrial sectors. A strong collaboration with Airbus Group Innovations (AGI) had led to a common entity through the NDT laboratory for Aeronautics Applications (LC2A). With the increasing portion of composite materials in the aerospace industry, assessment of the adhesive bonding properties of such composite structures is a key issue. Various aspects could decrease the quality of bonding, such as the surface contamination, non-optimal thermal cycle or external mechanical stresses. However, conventional NDT techniques are often not sensible to such damages in the adhesive bonds. Non-linear ultrasonic methods such as wave mixing, harmonic generation or non- linear imaging appear as promising techniques to detect kissing bonds and pre-damaging that could occur in adhesive bonds. The objective of this postdoc position is to develop NDT innovative solutions for the assessment of the adhesion quality by means of experimental techniques based on such non-linear methods. This post-doc position will be carried out in the framework of an international research program on the adhesion bonding. The candidate will work in the NDE laboratory for Aeronautics Applications located in Toulouse. Strong skills in experimental physics, instrumentation, and non-linear ultrasonics would be appreciated.

FDSOI technology scaling beyond 10nm node

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-11-2018

PsD-DRT-18-0074

claire.fenouillet-beranger@cea.fr

FDSOI (Fully-Depleted Silicon On Insulator) is acknowledged as a promising technology to meet the requirements of emerging mobile, Internet Of Things (IOT), and RF applications for scaled technological nodes [1]. Leti is a pioneer in FDSOI technology, enabling innovative solutions to support industrial partners. Scaling of FDSOI technology beyond 10nm node offers solid perspectives in terms of SoC and RF technologies improvement. Though from a technological point of view, it becomes challenging because of thin channel thickness scaling limitation around 5nm to maintain both good mobility and variability. Thus, introduction of innovative technological boosters such as strain modules, alternative gate process, parasitics optimization, according to design rules and applications, become mandatory [2]. The viability of these new concepts should be validated first by TCAD simulations and then implemented on our 300mm FDSOI platform. This subject is in line with the recent LETI strategy announcement and investments to develop new technological prototypes for innovative technology beyond 28nm [3]. The candidate will be in charge to perform TCAD simulations, to define experiment and to manage them until the electrical characterization. The TCAD simulations will be performed in close collaboration with the TCAD team. The integration will be done in the LETI clean room in collaboration with the process and integration team. Candidate with out-of-the-BOX thinking, autonomy, and ability to work in team is mandatory. [1] 22nm FDSOI technology for emerging mobile, Internet-of-Things, and RF applications, R. Carter et al, IEEE IEDM 2016. [2] UTBB FDSOI scaling enablers for the 10nm node, L. Grenouillet et al, IEEE S3S 2013. [3]https://www.usinenouvelle.com/article/le-leti-investit-120-millions-d-euros-dans-sa-salle-blanche-pour-preparer-les-prochaines-innovations-dans-les-puces.

Reverse engineering of an internal permanent magnet synchronous electrical machine and modelisation of evolutions based on new new magnet technologies developped in CEA

DMIPY (CTReg)

Autre

01-09-2013

PsD-DRT-13-0076

sebastien.fiette@cea.fr

The study aims at studying and modeling a synchronous electric motor with magnet buried in the rotor. This study begins with a preliminary phase of retro engineering and modeling of an existing machine. A second phase will focus on the design and the modeling of a new machine integrating a new technology of magnets developed in the CEA. In the context of electric transportation, if batteries and energy storage are still the weak point of the energy chain, the electric motor remains a central part that has to be optimized to raise efficiency. For twenty years, all motor structures have been studied and tested: dc motors, synchronous machines with permanent magnets, asynchronous machines and switched reluctance machines. This study will focus on a synchronous machine with magnets buried into the rotor. This type of machine offers a natural ability of delivering at full load a constant power along a wide speed range, associated with a high efficiency. Moreover, power density can be improved by increasing maximal speed range. The Post doc will be split into three parts: 1st phase: Testing of an existing commercial electrical synchronous machine with magnets buried in the rotor and characterization of its components. These tests will be done on a motor test bench situated in the CEA 2nd phase: Modeling of the commercial machine tested on the test bench and comparison of modeling results with experimental measurements from the first phase. 3rd phase: Design and modeling of evolution of the machine tested and modeled in phases 1 and 2, integrating new technologies of magnets developped by the CEA.

Conformal deposition of polymer thin-films in high aspect ratio 3D structures

Département Technologies Silicium (LETI)

Laboratoire

01-06-2018

PsD-DRT-18-0078

vincent.jousseaume@cea.fr

The deposition of thin films on challenging high aspect ratio structures are of key importance in many different areas of microelectronics and nano-technologies. For polymer thin films, filament-assisted CVD techniques (such as iCVD) have emerged recently as promising method for the conformal deposition of insulating thin films in 3D structures. However, it is still not clear if this CVD method can allow conformal coating inside porous and 3D substrates with acceptable growth rates and what are the limits of utilization. The work proposed here aims to study polymer thin film deposition by iCVD in high aspect ratio 3D structures in order to identify the parameters governing the deposition speed and the accessible degree of conformality. The works will be performed on high aspect ratio Through Silicon Vias and on various porous substrates. The candidate will be in charge of thin films deposition on a 200 mm tool and of the material characterization. The thin films will be characterized using physicochemical analyses (FTIR, X-Ray Reflectometry, Ellipsometry, Porosimetry, Contact angle, AFM). More in depth characterizations (using Electronic Microscopy, ToF-SIMS) will be carried out to study the deposition in 3D structures. The main objective of the work will be to identify the key parameters that play a role in the conformal deposition inside 3D structures and porous substrates as a function of the feature shape and size. The work will be done in the LETI/DTSi division. The material deposition and characterizations will be performed in the LETI clean room in close collaboration with an industrial partner. Part of the work will be done in collaboration with experts of materials characterization (CEA nanocharacterization platform), and specialists in charge of 3D integration.

Development of a Metal Supported Cell for Hydrogen production by High Temperature Steam Electrolysis

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Procédés et composants pour l'Energie

01-09-2012

PsD-DRT-12-0080

gerard.delette@cea.fr

The development of Metal Supported Cells (MSC) for High Temperature Steam Electrolysis (HTSE) constitutes an interesting innovation able to reduce the degradation of this component under operation. An increase in the cell life time would be a valuable contribution to cost reduction and is able at positioning HTSE as an alternative process to other hydrogen production technologies. However, some progresses in the elaboration of MSCs are still required. Within the current process, functional ceramic layers of the MSC are joined to the metallic substrate at elevated temperature (> 1000 °C). Mismatch of the mechanical properties of the materials as well as the reducing conditions fixed by the metal substrate during sintering lead to MSCs having insufficient electrochemical performances. The post-doctorate aims, on the one hand, at obtaining a better understanding of the mechanisms that occur in the multilayer structure during sintering and, on the other hand, at proposing and testing technological solutions able to improve to reliability of MSC elaboration.

Real time low cost algorithms for brain computer interface with multiple degrees of freedom

Clinatec (LETI)

Clinatec (LETI)

01-05-2012

PsD-DRT-12-0081

tetiana.aksenova@cea.fr

The topic of the postdoctoral project is the optimization of BCI methods and algorithms for medical application in humans (quadriplegic subjects). Namely the particular goal of the postdoctoral fellow will be optimization and the acceleration of calculation to allow multiple degrees of freedom (up to 26) in real time. Selecting the appropriate features subset will improve the computational efficiency and the quality of control. To this purpose the algorithms of sparse modeling will be applied. To map ECoG recordings to the spatial-temporal-frequency space, continuous wavelet transform (CWT) is applied. Optimization will include the implementation of low cost CWT and C++ coding. The project will include the test and the adaptation of BCI algorithms to wireless signal transmission with the implant WIMAGINE. Finally the adaptation of algorithms to medical environment of quadriplegic subjects (the use of imaginary tasks, presence of stimuli in the signal, the restricted duration of experiments) will be under responsibility of postdoctoral scientist.

In situ analytical device based on the LIBS technique for the characterization of hard environment liquid media

Département des Technologies Solaires (LITEN)

Laboratoire Matériaux et Procédés Silicium

01-01-2018

PsD-DRT-17-0084

malek.benmansour@cea.fr

The proposed research project aims at developing an in situ analytical device based on the LIBS technique for the characterization of hard environment liquid media such as high temperature melting materials or highly volatile liquid metals used for development of low carbon energy production. The project involves two CEA teams specialized in LIBS instrumentation, analytical developments and high temperature environments. At high temperature, the molten metals have a high surface reactivity leading to processes of oxidation, slagging ? Non-intrusive analysis of this surface by traditional LIBS tools leads to a non-representative results of the molten metal chemical composition. In this project, a new-patented concept based on a mechanical stirring coupled to the LIBS device is developed in order to have a renewable and stable surface of the liquid metal. The aim is to have an on-line representative composition of the metal during the treatment process. The developed demonstrator will be validated for the analysis of impurities (at ppmw ranges) in liquid silicon (T> 1450 °C) during the purification process and the crystallization one for photovoltaic applications. At the end of the project, recommendations for in-situ analysis of liquid sodium (used as cooling fluid in nuclear reactors) will be given.

Developpment of a control quality method for radiotherapy treatments based on dosimetric gels

DM2I (LIST)

Laboratoire de Métrologie de la Dose

01-10-2017

PsD-DRT-17-0085

valentin.blideanu@cea.fr

In the field of dosimetry for radiotherapy, chemical dosimetry, and in particular gel dosimeters, are good candidates for dose distribution measurements for the quality control of treatment plans. Actually, these gels are radiosensitive and, thus, enable measurements of the dose in 3 dimensions when read by adapted imaging methods. This post-doctoral project deals with the development of gel dosimetry methods, using two types of reading devices: Optical tomography and Magnetic Reading Imaging. For gel-MRI dosimetry, the aim will be to adapt and validate the method used at LNHB (Laboratoire National Henri Becquerel) for quality control applications for MR-guided-radiotherapy devices. For this purpose, specific phantoms will have to be designed and produced using 3D printing. The reading method will also have to be optimized and transposed on partnering hospital devices. Concerning the gel-optical CT dosimetry method, the whole method will have to be developed. This involves an adaptation of the composition for the gel, a characterization of the reading device and a validation of the method established.

Realistic motion generation for anthropomorphic systems

DMIPY (CTReg)

Autre

01-10-2013

PsD-DRT-13-0087

alain.micaelli@cea.fr

This work is devoted to Digital Human motion generation, for manufacturing (specifically, for design, maintenance, operator training, workstation design and ergonomics, ...), health (postures for surgery, rehabilitation, ...), or entertainment industry (animation for games, movies,...). Based on complementary skills and developments of Gepetto LAAS team, and CEA LIST team, in terms of path planning (HPP), dynamic motion control of anthropomorphic systems, the objective of this post doc is to combine both approaches, a global one, dealing mainly with geometric and quasi-static constraints and characteristics, and a local one, dealing with dynamics and taking into account human movement characteristics (motor primitives, minimizing cost criteria, etc ...).

Study of cooling solutions for compact electronic systems

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire d'Empilement de Circuits Avancés

01-09-2013

PsD-DRT-13-0088

jean-philippe.colonna@cea.fr

3D technologies (i.e. electronic components vertically stacked) constitute an axis of global research, both at the architectural and manufacturing level. The Grenoble area is at the heart of these technological breakthroughs with world first prototypes that make Cea-Leti one of the leaders in these advanced technologies. One of the critical points of this innovative technology is to control the thermal management in such 3D components regardless of the final application. Nowadays conventional solutions like adding a fan cannot fit all the thermal requirements, and may be of limited effectiveness. More integrated solutions are now unavoidable and can be considered from two points of view: heat can be managed directly at the component-level in silicon chips that make up the 3D-stack, or it can be managed at package level. Ideally, the two approaches should be combined. The first objective of this study is to achieve an exhaustive state of the art and evaluate the potential of the different solutions for the components developed at Leti. This evaluation will be based on thermal simulations and a critical analysis based on technological feasibility, consumption, efficiency, cost,? and lead to choose the most appropriate solution. The second part of the work will be dedicated to the implementation of this solution. Relying on experts of silicon and packaging technologies, the candidate will be responsible for contributing to the design of the component (design and implementation) and its characterization. This position is for a researcher with a strong background in the areas of thermal and microelectronic components. This position requires analysis skills, a large autonomy and unifying skills.

Development of a cell analysis algorithm for phase microscopy imaging

Département Microtechnologies pour la Biologie et la Santé (LETI)

Laboratoire Imagerie et Systèmes d'Acquisition

01-09-2018

PsD-DRT-18-0089

cedric.allier@cea.fr

At CEA-Leti we have validated a video-lens-free microscopy platform by performing thousands of hours of real-time imaging observing varied cell types and culture conditions (e.g.: primary cells, human stem cells, fibroblasts, endothelial cells, epithelial cells, 2D/3D cell culture, etc.). And we have developed different algorithms to study major cell functions, i.e. cell adhesion and spreading, cell division, cell division orientation, and cell death. The research project is to extend the analysis of the datasets produced by lens-free video microscopy. The objective is to study a real-time cell tracking algorithm to follow every single cell and to plot different cell fate events as a function of time. To this aim, researches will be carried on segmentation and tracking algorithms that should outperform today's state-of-the-art methodology in the field. In particular, the algorithms should yield good performances in terms of biological measures and practical usability. This will allow us to outperform today's state-of-the-art methodology which are optimized for the intrinsic performances of the cell tracking and cell segmentation algorithms but fails at extracting important biological features (cell cycle duration, cell lineages, etc.). To this aim the recruited person should be able to develop a method that either take prior information into account using learning strategies (single vector machine, deep learning, etc.) or analyze cells in a global spatiotemporal video. We are looking people who have completed a PhD in image processing, with skills in the field of microscopy applied to biology.

Low temperature process modules for Coolcube

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Composants Logiques

01-10-2016

PsD-DRT-16-0092

claire.fenouillet-beranger@cea.fr

Distributed optimal planning of energy resources. Application to district heating

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-01-2014

PsD-DRT-13-0095

Jesus-Javier.GILQUIJANO@cea.fr

Heating district networks in France fed more than one million homes and deliver a quantity of heat equal to about 5% of the heat consumed by the residential and tertiary sector. Therefore, they represent a significant potential for the massive introduction of renewable and recovery energy. However, heating networks are complex systems that must manage large numbers of consumers and producers of energy, and that are distributed in extended and highly branched geographical zones. The aim of the STRATEGE project, realized in collaboration among the CEA-LIST and the CEA-LITEN, is to implement an optimal and dynamic management of heating networks. We propose a multidisciplinary approach, by integrating the advanced network management using Multi-Agent Systems (MAS) and by considering simplified physical models of transport and recovery of heat developed on Modelica. The post-doc's goal is to design mechanisms of planning and optimization for allocation of heat resources that consider the geographical information from a GIS and the predictions of consumption, production and losses calculated with the physical models. In this way, several characteristics of the network will be considered: the continuous and dynamic aspect of the resource; sources with different behaviors, capabilities and production costs; the dependence of consumption/production to external aspects (weather, energy price); the internal characteristics of the network (losses, storage capacity). The developed algorithms will be implemented in a existing MAS management plateform and will constitute the main brick of a decision-support engine for the management of heating systems. It will initially operate in a simulated environment and in a second time online on a real system.

Development of flexible solar panel for space application

Département des Technologies Solaires (LITEN)

01-10-2017

PsD-DRT-17-0097

mathieu.baudrit@cea.fr

Traditional solar panels used to power satellites can be bulky with heavy panels folded together using mechanical hinges. Smaller and lighter than traditional solar panels, flexible solar array consists of a flexible material containing photovoltaic cells to convert light into electricity. Being flexible, the solar array could roll or snap using carbon fiber composite booms to deploy solar panels without the aid of motors, making it lighter and less expensive than current solar array designs. On the other hand, satellite trends are shifting away from one-time stints and moving towards more regular use in a constellation setting. In the last years, the desire increased to mass-produce low-weight satellites. Photovoltaic arrays companies are challenged on their capacity to face these new needs in terms of production capacity and versatility. And this is exactly where space photovoltaics can learn from terrestrial photovoltaics where this mass production and low-cost shift occurred years ago. To tackle these new challenges, the Liten institute started to work on these topics two years ago. In the frame of this post-doc, we propose the candidate to work on the development of an innovative flexible solar panel architecture, using high throughput assembly processes. We are looking for a candidate with a strong experience in polymers and polymers processing, along with an experience in mechanics. A previous experience in photovoltaic will be greatly appreciated.

Systemic Optimisation and Functional Digital Twin

Département Ingénierie Logiciels et Systèmes (LIST)

Labo. ingénierie des langages exécutables et optimisation

01-10-2018

PsD-DRT-18-0098

arnaud.cuccuru@cea.fr

The current economic constraints in the industrial field are getting tighter, which leads to increased competitiveness and a need to produce better and quicker. The optimisation of production processes and their design therefore lies at the centre of the considerations on the Factory of the Future. Optimisation needs are large and cover various scopes ranging from design and logistics to processes, with the objective of reducing time and costs while maintaining or even increasing the quality and tailoring of products and services. Optimisation and simulation tools need a comprehensive vision of the systems they study, which may be provided by a Functional Digital Twin of the factory/construction site. The approach of Model-Driven Engineering (MDE) allows engineers to design such a Twin and to interconnect it with numerical models (equations, 3D models ?), which allows validating and/or optimising the overall system operation through a complete Digital Twin. The goal of this Post-Doc is to investigate and develop a generic and configurable framework for process optimisation (scheduling, sizing ...) around MDE tool Papyrus and its simulator. An executable language, dedicated to the description of Digital Twins, has been implemented in Papyrus, and first industrial optimization projects have been completed. The main objective of this Post-Doc is to propose a generic simulation-based framework to solve optimisation problems of the factory/construction site. The goal is also to improve the decision support environment existing in Papyrus, using results of optimisations and simulations. The candidate will have to ensure a technology watch on the topics of process optimisation within the framework of the industry of the future and to organise and animate the topic of optimisation in the laboratory.

Kinetic study of biocide effect in nanocellulose_based food film

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire de Nanocaractérisation et Nanosécurité

01-10-2016

PsD-DRT-16-0099

delphine.boutry@cea.fr

This project will study the kinetic of biocide effect of a nanocellulose-based film food. The main aim is to graft Ag and/or ZnO NPs on and inside halloysite particles that have a characteristic shape of twisted sheets and therefore could acting as NPs tanks. The localization of NPs outside halloysite could induce a fast biocide effect with limited duration whereas the internal grafting could produce longer biocide effect. This project gathers all steps from the film food synthesis, its nanocharacterization to the evaluation of its toxicological effect on bacteria. The final goal is to find one or many halloysite functionalizations allowing to extend the biocide effect in film food and to transpose it to other types of materials.

Error Coding Driven Synthesis of Combinational Circuits from Unreliable Components

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Etudes et Spécifications de Systèmes de Communication

01-01-2015

PsD-DRT-14-0101

valentin.savin@cea.fr

With the advent of nanoelectronics, the reliability of the forthcoming circuits and computation devices is becoming questionable. Indeed, due to huge increases in density integration, lower supply voltages, and variations in the technological process, MOS and emerging nanoelectronic devices will be inherently unreliable. As a consequence, the nanoscale integration of chips built out of unreliable components has emerged as one of the most critical challenges for the next-generation electronic circuit design. To make such nanoscale integration economically viable, new solutions for efficient and fault-tolerant data processing and storage must now be invented. This post-doctoral position aims at investigating innovative fault-tolerant solutions, at both device- and system-level, that are fundamentally rooted in mathematical models, algorithms, and techniques of information and coding theory. Investigated solutions will build on specific error correcting codes, able to provide reliable error protection even if they themselves operate on unreliable hardware. The goal is to develop the scientific foundation and provide a first proof-of-concept, as an essential condition for bringing about a paradigm shift in the design of future nanoscale circuits.

Conversational Agent for Medical Serious Games

Département Intelligence Ambiante et Systèmes Interactifs (LIST)

Vision & Ingénierie des Contenus (FAR)

01-09-2016

PsD-DRT-16-0102

olivier.ferret@cea.fr

The LVIC laboratory participates in a research project which aims to develop innovative tools for teaching medical students. The training will be done through serious games of second generation, in which the learner can interact directly with the environment: - immersed in a 3D environment with a Virtual Reality Head Mounted Display and motion detection, - with natural and ecological handling of the environment (instruments, patient ?), - and a voice interaction with conversational and emotional avatars. The multimedia team of LVIC laboratory is involved in the project to develop tools allowing students to interact in natural language with conversational avatars. In this context, the post-doctoral researcher will be in charge of: - studying the state of art of conversational agents; - understanding and mastering the technological components of the laboratory language processing; - proposing and developing a dialogue system allowing interaction in natural language with conversational avatars of the project.

Couplings between the distributions of water and current density in operating Proton Exchange Membrane Fuel Cell (PEMFC)

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire des Composants Piles à combustible, Electrolyseurs et Modélisation

01-01-2015

PsD-DRT-14-0104

arnaud.morin@cea.fr

The post-doc work will be focused on the measurement of the current density and of the water distributions in an operating fuel cell with a real design, in order to give a better understanding of PEMFC operation as a function of the operating parameters (Temperature, Gas hydration, Pressure, Gas composition). The measurement of the distribution of the current density will be performed using a reliable commercial setup on a full size cell. CEA developed a technique based on Small Angle Neutron Scattering (SANS) as a non-intrusive tool in order to quantify the water distribution during fuel cell operation within and without the membrane. CEA benefits for international recognition on this topic. These measurements will be conducted in high flux neutron reactors, such Institut Laue Langevin (ILL). Some specific high and low resolution neutron imaging experiments could be also be conducting additionally in order to have a complete 3D view of water repartition.

Internet of Things applications: Ultra Low power and adaptive analog-to-digital converters in advanced FD-SOI process

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Architectures Intégrées Radiofréquences

01-01-2015

PsD-DRT-14-0106

patrick.audebert@cea.fr

The post-doctoral project aims to study Ultra Low Power and Adaptive Analog-to-Digital Converter (ADC) over a wide operating range of microsystem from Internet of Things or sensor networks applications. The ADC is one of the main blocks into System on Chip (SoC) because of its position between physical signal treatment (Front-End) and digital treatment (Digital Base Band). Its performances in terms of resolution or frequency ranges affect the overall performances of the SoC. A particular consideration will be carrying out on power consumption and some reconfigurability technics will be used to adapt its consumption to the contextual performances required. To reduce as possible the ADC consumption, advanced FDSOI process will be used. Based on Ultra Low Power constraints, the post-doctorate student will study the literature and will propose, design and experimentally demonstrate a relevant topology to increase the power efficiency and the performances of ADC by using advanced FDSOI process.

Implementation of a software package for the simulation of the Infrared Thermography Non Destructive Testing method

DAQUIT (CTReg)

Autre

01-01-2015

PsD-DRT-14-0109

damien.segur@cea.fr

The CEA LIST implements simulation tools for several Non Destructively Testing (NDT) techniques, integrated to the CIVA software platform. The different methods used, nowadays in the CIVA platform, concern the ultrasonics, eddy current and radiography techniques. The TREFLE is a reference lab in thermics and had developped some original modelling approachs for the control by Infrared Thermography (IR) method. In the frame of a project funded by the Aquitaine region, these two labs collabore to implement simulation tools for the NDT by the Infrared Thermography technique, dedicated to industrial applications and accesssible to a non-numericians public. The objective of this post-doc position is the implementation of physical modelling (in a matlab environment) for the resolution of transient thermal problems in multilayers configurations (like composite materials used in aeronautics), eventually anisotropic, for a flash or a periodic excitation with uniform or point irradtiation.

Apprenticeship Learning Platform deployment for industrial applications

DPLOIRE (CTReg)

Autre

01-10-2018

PsD-DRT-18-0112

guillaume.hamon@cea.fr

This project aims at developing a demonstrator that integrates state-of-the-art technologies and improve it on a use-case representative of the industrial world. The demonstrator will consist in a robotic / cobotic arm coupled to an acquisition sensor (RGBD type). This device will be positioned in a workspace made of a rack / shelf containing objects / pieces of various shapes and qualities (materials, densities, colors ...) in front of which will be placed a typical conveyor prototype of industrial installations. The type of tasks expected to be carried out by the demonstrator will be "pick and place" type tasks where an object will have to be identified in shelf and then placed on the conveyor. This type of demonstrator will be closer to the real industrial conditions of use than the "toy" examples used in the academic field. This demonstrator will focus first on the short-term effectiveness based on state of the art technologies for both hardware and software, for a use case representative of the industrial world. At first, it will thus be less focused on the evolution of the algorithms used than on the adaptation of the parameters, the injection of knowledge a priori dependent on the context making it possible to reduce the high-dimensional input space, etc.

Photothermal active hydrogel-based microneedles for the delivery of insulin

Département Nord Pas De Calais

01-11-2018

PsD-DRT-18-0113

severine.vignoud@cea.fr

Microneedles (MN) array offer a highly promising solution for overcoming the barrier that the skin creates to deliver small molecular as well as macromolecular therapeutics. Drug delivery from MN arrays is based on dissolving the microneedles once inserted into the skin. This is however a large limitation for diseases requiring medications that must be dosed intermittently on demand and over a longer period of time. To address this issue, a stimuli responsive MN array system for the on-demand delivery will be developed in this project. It is based on the formation of reduced graphene oxide (rGO) impregnated hydrogel based MN arrays. The choice of rGO loaded MNs is made based on its high light absorption in the near-infrared region and excellent photothermal properties, converting absorbed light into heat. To validate the proof of concept for on demand drug delivery, insulin will be integrated into the MN and its release upon light activation explored. Next to exploring the physico-chemical and mechanical properties of the novel MN array, the focus will be on transdermal delivery of insulin into diabetic mice. This part of the work will be performed in close collaboration with the European Genomic Institute for Diabetes (EGID FR 3508) which is one of the first and only institution dedicated to research on diabetes.

Wireless biological sensor using 2D materials (Graphene , Molybdenium disulfide)

Département Composants Silicium (LETI)

Laboratoire Composants Micro-Capteurs

01-11-2016

PsD-DRT-16-0115

thomas.alava@cea.fr

The main goal of the post-doctoral position is the fabrication of a biological sensor using 2D materials and that can be remotely addressed thanks to a RF antenna simultaneously fabricated alongside the biosensor. The post-doctoral associate will be in charge of the fabrication and characterization of the prototype. Starting from well-designed modelling, he/she will first establish a design architecture for the sensor and RF antenna. Once designed and sized, the post-doctoral associate will adapt existing transfer protocol of 2D materials to develop an innovative fabrication process for the sensor. He/she will then fabricate the first prototypes of the sensors. Consecutively he/she will validate first the remote addressing of the sensor via the RF antenna. Secondly he/she will lead biodétection tests to assess the sensitivity of the fabricated sensors. Finally, he/she will try to integrate Transition Metal Di-chalcogenides 2D materials (such as MoS2) to graphene sensors inside a hybrid 2D materials biological sensor. The goal here will be to boost operational sensitivity.

Micro-energy sources for biomedical applications

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Composants Récupération de l'Energie

01-09-2012

PsD-DRT-12-0117

simon.perraud@cea.fr

There is a growing interest towards wireless implantable systems for in vivo biomedical applications. However, such implantable systems have a limited lifetime determined by the battery capacity. CEA LITEN is working on innovative miniaturized systems integrating an energy harvesting component with a rechargeable battery. This type of micro-systems will be used for powering sensors or other implantable medical devices. The post-doctoral researcher will work on the design, the fabrication and the characterization of demonstrators consisting of the energy harvesting component, the battery and a power management circuit. Numerical simulations could also be performed, with the help of specialized engineers. The characterization of the demonstrators and the numerical simulation results will allow the post-doctoral researcher to propose innovative solutions for optimizing the system. The post-doctoral researcher will work in a multi-disciplinary team, which requires strong abilities for team working and communication.

Shape optimization for optical computation

Département d'Optronique (LETI)

Laboratoire des Capteurs Optiques

01-01-2019

PsD-DRT-18-0119

alain.gliere@cea.fr

Context CEA - LETI is one of the Europe's leading research centers in microelectronics. This post-doctoral position is proposed within the framework of the CLEAR CARNOT project, involving two departments of CEA - LETI. Namely, the DOPT department specializes in the design, manufacture and characterization of optoelectronic components while the DACLE department performs research on embedded systems and innovative computational architectures. Research topic / Missions Although several extremely compact components performing more or less complex unitary functions have been designed and manufactured in recent years, no practical application of numerical shape optimization methods has emerged to date in the field of integrated photonics. Building on the recent development of optical computation, particularly in the wake of neural network and machine learning, we aim to demonstrate the feasibility (design, fabrication and test) and the applicative interest of integrated optical calculation circuits obtained by shape optimization techniques. The candidate will participate in the choice of the optical computation prototype architecture, and will be in charge of the photonic circuit design (conventional circuit, shape optimized circuit, and finally reconfigurable circuit). He/she will rely on an existing toolbox, dedicated to shape optimization of photonic components, developed as part of an ongoing work. The work should lead to theoretical developments as well as applications, with publications in international journals. Required skills Candidates will have completed a PhD in applied mathematics, mathematical physics or related fields. He/she should demonstrate both theoretical and computational skills. Implementations will be performed in the MATLAB language. Knowledge in shape optimization and an interest for photonics would be greatly appreciated.

Design of integrated photonics modules

Département d'Optronique (LETI)

Laboratoire des Coposants Photonique sur CMOS (LCPC)

01-12-2013

PsD-DRT-13-0121

stephane.bernabe@cea.fr

Design of next generation optoelectronic transceivers (particularly on-board modules) requires the merging of two advanced technologies: Silicon Photonics and 3D Silicon Packaging, both being developed at Leti. In order to meet the requirements in term of technical specifications, cost and density, it is needed to achieve a codesign involving mechanical, thermal, optical and mainly RF aspects. The aim of the work consists in designing such integrated modules by optimizing the RF interconnections of the module (internal and external), and the proper setup of the integrated circuits (ASICs). Modelling of several architectures will be led under HFSS and ADS softwares. Finally, the integration of the module into its system environnement will be taken in charge, so as its characterization (involving testboard and testbench design).

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Chimie et Sécurité des Nanomatériaux

01-09-2012

PsD-DRT-12-0122

simon.clavaguera@cea.fr

Physisorption of chemical species on sensitive surfaces during transfer in controlled mini-environment in microelectronics industry

Département Technologies Silicium (LETI)

Laboratoire

01-12-2017

PsD-DRT-17-0124

herve.fontaine@cea.fr

A characterization platform based on the connection concept between process and characterization tools through the use of a transfer box under vacuum was implemented allowing a quasi in-situ characterization of substrates (wafers) of the microelectronics. Currently, this transfer concept based simply on static vacuum inside a carrier box is satisfactory regarding the residual O or C on the surface of especially sensitive materials (Ge, Ta, Sb, Ti?) and the MOCVD layers growth on GST or III/V surfaces. Its optimization for more stringent applications (molecular bonding, epitaxy?) in terms of contamination surface prevention requires studies the understanding of the physico-chemical evolution of the surfaces. The proposed work will be focused on physico chemical studies of the evolution and molecular contamination of surfaces during transfers and will take place in clean room. XPS, TD-GCMS and MS coupled to the carrier itself (to be implemented) will be used to address the sources (wall, seals, gaseous environment?) of the adsorbed chemical species implied and to determine the physisorption mechanisms on the substrates. The studied surfaces will be sensitive to the contaminants in such a way than the box environment impact will be extracted and studied parameters will be the nature of polymer seal used, the carrier box thermal conditioning, the vacuum level, the use of low pressure gaseous environment in the carrier (gas nature, pressure level?).

Study of substrate coupling in millimeter wireless circuits

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Architectures Intégrées Radiofréquences

01-01-2018

PsD-DRT-17-0125

emeric.defoucauld@cea.fr

The candidate will study substrate coupling in millimeter wireless circuit. He will demonstrate the influence of silicon substrate on millimeter circuit design The first task will consist in establishing the state of the art of substrate reduction technics on millimeter chip. The influence between building blocks at layout level will be analyzed. Parasitic noise effects, frequency and power spurious will be studied with coupling substrate tool. Specifications for layout design in order to reduce spurious will be done, especially for power, analog and digital applications. A design methodology will be proposed with this results.

Development of femtosecond Fiber Bragg Grating acoustic receivers for the Structural Health Monitoring using passive acoustic tomography

DM2I (LIST)

Laboratoire Capteurs et Architectures Electroniques

01-01-2018

PsD-DRT-17-0126

guillaume.laffont@cea.fr

The proposed post-doctoral fellowship is part of a transverse project initiated by the CEA and which consists in developing a prototype of a continuous monitoring system of a metallic structure (pipe for example) using fiber Bragg gratings acoustic receivers and passive imaging (or passive tomography). It aims to demonstrate the relevance of the SHM (Structural Health Monitoring) concept for nuclear facilities using optical fiber sensors operating in continuous and in extreme environment. This project is based on two recent developments: new generation of fiber Bragg gratings developed for severe environments and defect imaging algorithms based on ambient noise analysis. A demonstration of elastic wave reconstruction from passive algorithm applied to fiber Bragg gratings was carried out at the CEA in 2015, which is a world first, patented. The project aims more particularly to produce a demonstrator and to equip a pipeline on a test loop. It will provide input data relating to the ability of a moving fluid to generate elastic waves that can be analyzed in passive tomography.

Optimal Multi Agent System management of smart heat grid using thermal storage

Département des Technologies Solaires (LITEN)

Laboratoire Systèmes Thermiques

01-01-2014

PsD-DRT-13-0127

david.cheze@cea.fr

The aim of this work is a major contribution to a software framework based on coupling of Modelica/Jade environments that will allow to model, to simulate and to optimise the control of smart heat grid through dedicated thermal storage models development: interface specification to control the storages in the grid, simplified models design of heat grid's most crucial components to be integrated in Agents (production, distribution/storage, consumption) and design of consumption and production forecast models in order to manage anticipation and improve the overall efficiency. The evaluation of performance is based on the test case build in Modelica simulation environment.

Development of numerical tools for the simulation of ultrasonic nondestructive inspection.

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire de Simulation et Modélisation

01-09-2012

PsD-DRT-12-0130

sylvain.chatillon@cea.fr

The CEA LIST develops the CIVA software platform (http://www-civa.cea.fr), in position of global leader for the simulation and expertise of non-destructive testing (ultrasonic and electromagnetic methods, radiography, X tomography). In the context of extending and improving capabilities of the CIVA platform, the post-doc fellow will contribute to the development of numerical methods for the ultrasonic testing (UT) simulation module. The semi-analytical models of CIVA are based on physical simplifying hypotheses for the propagation of the ultrasonic beam and its interaction with defects. These methods provide efficient computational performances with accurate results in a wide range of realistic applications. However, configurations for which these models are not valid. The so called ?numerical models? including finite element method (FEM), finite difference method (FDM) or boundary element method (BEM) enable to deal with these configurations without any simplifying hypotheses. However, the computation time is prohibitive in an industrial context, especially for 3D applications. The approach adopted in the CIVA platform consists in hybridizing semi analytical models with numerical ones in order to benefit of both the numerical efficiency of the former and the capability of simulating complex phenomena of the later. The tasks associated to the post include the development of numerical methods themselves, in collaboration with academic partners, the integration in CIVA of a meshing solution enabling the data formatting for the numerical solving and specific developments for the coupling with semi analytical methods. Multi-boxes solutions, enabling for example the optimization of configurations with several defects or a coupling around the source and the defect, will be studied.

Atomic sensors based on metastable 4He

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Capteurs Innovants

01-01-2017

PsD-DRT-16-0131

agustin.palacioslaloy@cea.fr

Detection of weak magnetic fields opens the way to new techniques of medical imaging, geophysics and chemistry. Optically pumped magnetometers are currently the most accurate and precise sensors for magnetic fields [1]. Our lab works on optically-pumped magnetometers based on a thermal gas of helium-4 metastables, a spin-one electronic species. Our main achievement in last years has been the design and space qualification of the most recent generation of magnetometers available for spatial exploration, which were launched by ESA Swarm mission [2]. We are now starting a new project in order to explore further applications of magneto-optical effects of metastable helium. Indeed, dichroism and birefringence have been observed on 4He from the very first times of optical pumping [3] but, in strong contrast with alkali [4], the nonlinear regimes which can be reached from the introduction of 1083 nm lasers have been hardly studied. These regimes open new possibilities for realizing not only magnetometers but also other kind of useful sensors which address a broader range of industrial applications. We are looking for a motivated postdoc candidate willing to work towards a better understanding of these effects but also towards harnessing them for building ultra-precise sensors. The applicant should have a PhD in physics, ideally with a good background in experimental atomic physics and/or laser physics. Our lab is well equipped and staff engineers will be available to assist the post doc on technical aspects related to optics, design of electronics and magnetic materials. The results will be divulgated in form both of journal publications and of patents. [1] Kominis et al., Nature 422 (2003) [2] http://smsc.cnes.fr/SWARM [3] Laloë, Leduc, Minguzzi, Journal de Physique, 30 (1969) S. Pancharatnam, J. Phys. B: At. Mol. Phys. 1 (1968). [4] Budker et al., Rev. Mod. Phys. 74 (2002)

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Chimie et Sécurité des Nanomatériaux

01-10-2012

PsD-DRT-12-0137

stephanie.desrousseaux@cea.fr

Development of an hermetic thin flim packaging for RF MEMS switches

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-01-2013

PsD-DRT-12-0139

Leti has developed for many years a RF MEMS switch process which have demonstrated RF performances at the state-of-the-art as well as a process maturity level closed to industrial standards. To finalize its component and especially to ensure long-terms reliability level for space applications, Leti is today developing an innovative hermetic thin film packaging process. The applicant will join a project team working on the development of this new technological brick. In a first step, the applicant will be in charge of the design of the process test vehicles, of the follow-up of their silicon batches fabrication in clean room and of their characterization during the process. In a second step, the applicant will perform a modeling study to optimize the design of the switches integrating this new packaging. In particular, he will propose new designs for mid RF power applications. Finally, the applicant will be in charge of the follow-up of the realization of silicon batches for the RF MEMS switches demonstrators. He will then supervise and participate to all the characterization studies on packaged components.

Developement of a simulation platform for the energy systems

Département des Technologies Solaires (LITEN)

Laboratoire Systèmes Solaires

01-01-2013

PsD-DRT-13-0141

franck.bourry@cea.fr

The evolution of power systems towards smart-grids, including a high share of renewable generation which can be combined with storage systems, lead to an increased complexity for designing and optimizing these systems. This leads to a need for new modeling and simulation tools, which have to manage different energy sources, different energy vectors and different technologies for energy conversion. Moreover, such simulation tools will be used to optimize the system sizing and to design energy management strategies. The objective of this project is to design the software architecture for the simulation platform, which will be in ad equation to the previously mentioned needs. Such software will be organized in order to maximize the transfer towards industrial partners. The software will be able to support multi-energy systems, and will leave the possibility for the user to implement its own component models or energy management strategies. The project is focused on the simulation platform architecture, and on the architecture model. This architecture will be used as a base for the development of a software. The objective of the given project is not to cover all the applications but rather to validate the architecture through a given application.

Development of a solid electrolyte to optimise lithium microbatteries

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Composants micro stockage de l'Energie

01-10-2012

PsD-DRT-12-0142

lucie.levan-jodin@cea.fr

All-solid-state microbatteries are developing for nomad applications (RFID, autonomous sensors?). Their main advantages are due to the electrolyte, a thin film inorganic material allowing a very good cyclability (>10000 cycles), long life, good thermal resistivity and excellent safety. These thin film microbatteries have to response to a challenge of integration: decreasing of size but increasing of performances. The goal of this post-doc is to develop the electrolyte performances. The first part will focus on the optimisation of the actual electrolyte and the second part on the development of a new electrolyte material. The electrolyte deposition will be done by Physical Vapor Deposition. Le position is in the CEA/LITEN/DTNM/LCMS for a common laboratory CEA/ST Microelectronics.

Planning energy consumption within an eco-district

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-10-2012

PsD-DRT-12-0146

jean-philippe.poli@cea.fr

Energy consumption and production are changing, and the birth of eco-districts is now a reality which is a continuation of these changes. Eco-districts consists in grouping within the same territory entities which consume or produce energy and in managing these resources locally. Alongside these developments, homes, shops and even offices are increasingly equipped with communicating sensors and intelligent devices that can be controlled remotely. It is therefore possible to control these devices taking into account several factors: the financial or environmental cost of energy consumed, the respect of comfort desired by the people and the intent of the directors of the eco-district. Many algorithms have been developed in order to plan and control devices more or less autonomous, while expert systems have often been excluded because of their lack of expressiveness in this area. The goal of this postdoctoral fellowship is to check if fuzzy expert systems can be used to plan devices which consume a source of energy.

Carbon nanotubes grafting for positive electrodes of lithium/sulfur cells

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Batteries Avancées

01-10-2012

PsD-DRT-12-0149

celine.barchasz@cea.fr

In a view to develop electric vehicles, researches on lithium batteries are now focusing on sulfur active material. Indeed, this new system should allow to produce cheap and high energy batteries of about 600 Wh/kg. While being developed for more than 40 years, the limitations of such a system are still quite problematic: elemental sulfur is an electronic insulator, sulfur and intermediate lithium polysulfides are soluble in the electrolyte and final discharge product Li2S is non-soluble and insulating too. This post-doctoral position will thus aim at improving the performances of the sulfur positive electrode, by combining : - Carbon nanotubes that will allow to improve the electronic conductivity of the positive electrode, as well as to provide a substrate for sulfur grafting - Disulfide functions that will be grafted on the nanotubes. Thanks to this chemical grafting of active material, the electrochemical reaction would occur without leading to sulfur and polysulfides dissolution, thus leading to higher capacity and cyclability along with lower self-discharge.

Model evolution management and mastering

Département Ingénierie Logiciels et Systèmes (LIST)

Laboratoire d'Ingénierie dirigée par les modèles pour les Systèmes Embarqués

01-12-2013

PsD-DRT-12-0150

sebastien.gerard@cea.fr

Designing ever more complex systems needs for new paradigms in order to face all the new challenges as improving safety while reducing time and cost to market. Paradigms, mainly active models and model transformations, promoted by model-driven engineering are providing efficient solutions to deal with those issues. However, as promoted in the series of international workshops on model and evolution (www.modse.fr), model (co-)evolution and consistency management become crucial activities to cope with the natural changes of any system. In fact, there is an increasing need for more disciplined techniques and engineering tools to support a wide range of model evolution activities, including model-driven system evolution, model differencing, model comparison, model refactoring, model inconsistency management, model versioning and merging, and (co-)evolution of models. As part of this project, the LISE want especially to consider model evolution management under both next perspectives: - The first issue is to enable modelers to manage the evolution of their models. They should be able to follow the changes that have been made within a model by providing as for example ?track changes? mode in the modeling environment. - The second issue concerns the problem of model versioning. The users need here to manage and use multiple versions of their models in a collaborative way.

New nanostructurated fluorescent materials for the detection of volatile organic compounds.

DM2I (LIST)

Laboratoire Capteurs et Architectures Electroniques

01-11-2012

PsD-DRT-12-0153

vesna.simic@cea.fr

The presence in indoor environments of many substances and (geno-)toxic, allergenic and infectious agents with pathogenic effects is well known. The on-site detection of these substances has become a strong need, related to public health concerns. To respond to this need and enable the development of sensitive and selective 'field-deployable chemical sensors', different technological solutions are being considered (conductimetric, electrochemical, piezoelectric, electro-mechanical, optical based systems?). Among all these methods, those based on the use of fluorescence phenomena are particularly interesting because of the inherently high sensitivity (lower limit of detection) of the technique and the possibility it offers to develop low cost, small size and low energy consuming devices. The proposal falls into this context and aims at evaluating the potentialities of new nanostructurated organic materials for the detection of indoor air trace pollutants by fluorescence change monitoring. This work will be done in straight collaboration with the Laboratoire Chimie des Polymères (UMR7610-CNRS/UPMC Paris VI) specialized in the synthesis of functionalized organogels. More precisely, we propose to develop new highly porous supramolecular materials serving either as substrate for the sensitive fluorescent polymer or functionalised so as to directly detect and recognize the vapor pollutant. The physico-chemical properties of these new materials will be examined by different techniques. Their performances in the presence of target pollutants (formaldehyde, acetaldehyde) and potentially interferants will be evaluated. Finally, the most interesting materials will be integrated into a functional prototype.

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-03-2010

PsD-DRT-10-5525

frederic.suard@cea.fr

Département d'Optronique (LETI)

Laboratoire Ingénierie et Nouvelles Applications

01-09-2010

PsD-DRT-10-5537

thierry.deutsch@cea.fr

Third generation Photovoltaic Solar Cells are based on the extensive use of nanostructurations to scatter light and confine the electromagnetic fields. Modelling and optimization of such a PV cells is currently a challenge since the phenomena involved in light trapping and confinement lie on several decades (from nanometers scale to several microns scale). Then, to develop and adapt simulation programs using low cost massively parallel processors are mandatory for PV cells conception. The task consists in developing computation techniques using GPU processors in order to optimize Third Generation Solar Cells. The post-doc will work within computer science specialists as well as optoelectronics modelling engineers, building a bridge between advanced and applied research of scientific computing.

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-04-2010

PsD-DRT-10-5543

frederic.suard@cea.fr

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-04-2010

PsD-DRT-10-5544

laurence.boudet@cea.fr

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-04-2010

PsD-DRT-10-5545

laurence.boudet@cea.fr

DM2I (LIST)

Laboratoire Modélisation et Simulation des Systèmes

01-06-2010

PsD-DRT-10-5546

frederic.suard@cea.fr

DM2I (LIST)

Laboratoire Modélisation et Simulation des Systèmes

01-06-2010

PsD-DRT-10-5547

Sylvain.Robert@cea.fr

CIGS solar cells optimized for energy harvesting applications in indoor environments

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Composants Récupération de l'Energie

01-04-2010

PsD-DRT-10-5597

simon.perraud@cea.fr

The goal of this post-doctoral fellowship is to develop solar cells based on CIGS thin films, for energy harvesting applications (powering of small electronic autonomous devices). This research project will aim at optimizing the solar cell performances in indoor environments, i.e., under low light intensity. The post-doctoral fellow will be involved in CIGS thin film elaboration by physical vapour deposition, film characterization, solar cell realization and test.

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire de Substrats Avancés

01-05-2010

PsD-DRT-10-5605

julie.widiez@cea.fr

Electrical Characterization of resistive memory devices

Département Composants Silicium (LETI)

Laboratoire de Caractérisation et Test Electrique

01-06-2010

PsD-DRT-10-5615

luca.perniola@cea.fr

The activity of the postdoc will be focused on electrical characterization and physical modeling of devices with integrated bistable oxides (ie NiO, HfO2): mainly he will address both the hardware & methodology to address the non-volatile memory performances (ie write/erase, data retention and endurance), and he will perform measurements on several devices featuring different bistable oxides (ie NiO, HfO2?). Note that particular attention will be devoted to pulsed measurements tailored for ?non-polar? or ?bipolar? devices. After having collected sufficient ensemble of data on memory performance, he will try to interpret them in the simplest form with possibly semi-analitycal models in order to catch the basics of physics relying behind the electrical data.

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-10-2010

PsD-DRT-10-5627

jean-philippe.poli@cea.fr

Silicon nanowire elaboration for microelectronic applications

Département Technologies Silicium (LETI)

Laboratoire

01-09-2010

PsD-DRT-10-5629

vincent.jousseaume@cea.fr

In order to realize high capacity integrated capacitor, one approach consists in developing electrode with high specific surface. In this work, we propose to perform capacitor integrating silicon nanowires. The first part of this study will be devoted to the understanding and to the optimization of Si nanowires CVD growth process. In parallel, properties of nanowires obtained by electrochemical silicon etching will be assessed and will be compared to CVD nanowires characteristics. According to the electrical performances, different strategies (metallization Silicuration?) will be envisaged in order to enhance their electrical conductivity.

DM2I (LIST)

Laboratoire Informations Modèles et Apprentissage

01-09-2010

PsD-DRT-10-5640

jean-philippe.poli@cea.fr

Electrical characterization of phase-change memories (PCM)

Département Nanotec (LETI)

Laboratoire Simulation et Caractéristisation Electriques

01-09-2010

PsD-DRT-10-5661

luca.perniola@cea.fr

Main objectives of this postdoc position will be the electrical characterization in view of basic physical modelling of chalcogenide materials and integrated devices for application to sub-45nm embedded Phase-Change Non-Volatile Memories. Electrical characterization (program dynamics, data-retention at different temperature, cycling, data-retention after cycling, disturb during cell reading and programming of nearby cells...) on test structures will be performed in order to put in evidence the main performances and degradation modes. Electrical characterization on blanket deposition will be operated as well, in order to assess the chalcogenide resistivity, crystallization temperature and thermal conductivity. The postdoc will be involved in a detailed experimental work, but he will have also to face the theoretical principles governing the functionality of a Phase-Change Memory. In particular, the obtained experimental data will be coupled to a basic physical modeling of the chalcogenide materials integrated in the test structure, considering the electrical & thermal dynamics governing the phase change process of PCRAM devices.

Nanocrystal synthesis

Département d'Optronique (LETI)

Laboratoire Composants pour la Visualisation

01-09-2010

PsD-DRT-10-5663

stephanie.le-calvez@cea.fr

This study aims at the chemical synthesis of infrared emitting nanocrystals for integration in LEDs. These nanocrystals will be characterized by TEM, XRD, EDX, UV-vis, PL, NMR, FTIR. Formulation of colloidal solutions suitable for deposition via inkjet printing. The candidate will work in the partner lab INAC/LEMOH

Metamaterials : design of an integrated high-impedance surface at 60 GHz, transposition and potentialities at 60 THz

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Communications sans fil et Sécurité

01-09-2010

PsD-DRT-10-5669

laurent.dussopt@cea.fr

Invisibility cloaking, sub-wavelength, thin antenna substrates, absorbers, etc., metamaterial structures have open many perspectives, some of them seeming futuristic while other being very practical given the current ste of the art in the domains of materials, microtechnologies and integrated optics. this post-doctoral work will focus on the study of high-impedance surfaces and the possibility of transposition of these designs between very different frequency bands (6 GHz, 60 GHz, 60 THz) corresponding to a wide range of technologies and applications. After a thorough bibliographic study of the current state of the art, the developments will include the design of high-impedance surfaces at the three frequency bands cited above and an experimental demonstration at 6 GHz and possibly at 60 GHz.

Electro-optical characterisation for Vis-IR active devices

Département d'Optronique (LETI)

Laboratoire Composants pour la Visualisation

01-09-2010

PsD-DRT-10-5683

stephanie.le-calvez@cea.fr

With the Integration of Heterogeneous Components Department, the Lab of Technologies and Components for Visualisation (DIHS/LTCV) develops OLED devices. One of its main topics is aimed at producing hybrid OLEDs, hybrid standing for the mix of deposition techniques : wet and evaporation. Target applications come from micro displays to photodetectors via lighting. For the development of hybrid OLEDs, DIHS/LTCV lab is looking for a Post_doc specialised in Organic Electronic to work in a fundamental research project. You will be in charge of stack development and of the characterisation method development for OLEDs devices.The optimisation of the cavity will be done based on the physical parameters of the different layers. At the same time, IV, CV and photoluminescence analyses will be adapted in visible and IR range. Finally, the layers interface study by impedance spectroscopy and Hall effect will be done.

Integrated antenna arrays for 60 GHz high-data rate communications

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Communications sans fil et Sécurité

01-10-2010

PsD-DRT-10-5686

laurent.dussopt@cea.fr

This post-doctoral offer is in support of our work program on the design of millimetre-wave antennas for high data rate communication systems in the 57-66 GHz frequency band. The realization of smart devices in this frequency band with a high level of integration and a low cost is a challenge accessible today thanks to the recent microelectronic technologies as well as other silicon technologies such as assembly, packaging or micromachining. Some applications in the consumer electronics domain are clearly identified and expected to result in product in a very short term. After a series of project completed these last years on the design of single antennas built and validated on different technologies, such as silicon or ceramic, the future projects will focus on the demonstration of antenna arrays with electronic beamsteering for long range applications. Several demonstrators will be realized in collaboration with our partners developing the integrated circuits and fabrication/assembly technologies in order to obtain a fully functional system.

Gas sensors based on diamond nanoparticles and nanoporous materials

DM2I (LIST)

Laboratoire Capteurs Diamants

01-09-2010

PsD-DRT-10-5702

emmanuel.scorsone@cea.fr

The aim is to develop surface acoustic wave sensors (SAW) with high sensitivity and high selectivity to gaseous compounds (< 100 ppb). The development strategy involves the use of diamond nanoparticles based guiding layers deposited on the piezoelectric substrate and chemically modified to tune the specificity of the sensors. In order to increase further the selectivity, the sensors will be coupled to specific filters placed before the sensors and based on probe molecules trapped in porous sol-gel based materials and able to react non-reversibly with interferent molecules. The topic includes 4 mains sections: 1) synthesis and functionalisation of diamond nanoparticles, 2) study of probe molecules and immobilisation in porous matrices, 3) study of the filtering capacity of the filters toward relevant interferent species, 4) metrology and calibration of the sensors. This work will be carried out in the "Diamond Sensors Laboratory" as well as laboratoire Francis Perrin both located in CEA Saclay.

Proton conducting interpenetrating polymer networks as new PEMFC membranes

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire des Composants Piles à combustible, Electrolyseurs et Modélisation

01-10-2010

PsD-DRT-10-5715

arnaud.morin@cea.fr

This subject takes place in the frame of the development of proton exchange membrane fuel cells (PEMFC) and the main objective is to increase their performance and durability for operation above 100°C at low relative humidity. The current standard membranes for use in PEMFC applications remain perfluorosulfonated ionomers such as Nafion® due their good proton conductivity and chemical stability. Nevertheless, their proton conductivity decreases for relative humidity below 70% especially at high temperature because of a too low density of proton conducting groups. This characteristic is a limitation for their use in the working conditions of the requirements for the automotive application. With these polymers, an increase of the proton conducting group density leads to a decrease of mechanical and dimensional stability. Yet, this stability is already quite low and decreases the PEMFC durability. The goal of this subject is to develop new membrane structures based on interpenetrating polymer networks that do not present this antagonism between good mechanical stability and proton conductivity. This strategy which has recently been patented by CEA (patent application number 08 06890) is based on the association of two entangled polymer networks, one sulfonated for proton conductivity and one fluorinated for mechanical and chemical stability. The applicant will make the membranes and then will characterize their mechanical properties, proton conductivity as well as gas permeability. He will also quantify their performance and durability in a running fuel cell.

Nano-silicon based negative composite electrode for lithium-ion batteries

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Batteries Avancées

01-10-2010

PsD-DRT-10-5718

severine.jouanneau@cea.fr

With the aim of improving the battery type lithium-ion batteries, many works are devoted to research of new materials for the manufacturing of high-capacity electrodes. Silicon is an attractive material as an element of negative electrode instead of graphitic carbon with its high capacity that can theoretically reach almost 3579 mAh/g (Li15Si4, ten times more than the graphite (372 mAh / g, LiC6) . However, one major problem that has prevented the development of such electrodes is the high coefficient of volumetric expansion of silicon which leads to rapid degradation of the material (cracked, spraying the electrode ,....) and its performance. In this context, the work of post-doc will be to explore the electrochemical performance of negative electrodes prepared from silicon nanoparticles synthesized by laser pyrolysis CEA. The work will be to incorporate nanoparticles in a negative composite electrode and test its performance. The understanding work will be focused on the dual influence of nanostructuration of silicon particles and of the composition / implementation of the composite electrode on the performance. Thus, this work will be located at the junction of two CEA laboratory specialists from both key points of the study (Synthesis in Saclay, development and characterization of batteries in Grenoble).

modelling and Control of voltage and frequancy in GALS architecture submitted to Process-Voltage-Temperature variability

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Infrastructure et Ateliers Logiciels pour Puces

01-11-2010

PsD-DRT-10-5722

suzanne.lesecq@cea.fr

The evolution of sub-micron technologies has induced tremendous challenges the designer has to face, namely, the Process-Voltage-Temperature varibility and the decrase of power consumption for mobile applications. The work to be done here concerns the DVFS (Dynamic Voltage and Frequency Scaling) policies for GALS (Globally Asynchronous, Locally Synchronous) architecture. A fine grain modelling of the voltage and frequency ?actuators? must be first done in order to simulate in a realistic ways the physical phenomena. Especially, the various parameters that may influence the system will be considered (process variation, supply voltage variation and noise, temperature variation, etc.) Then, Non-Linear (NL) control laws that take into account the saturation of the actuators will be developed. These laws will be validated on the physical simulator and their performances in regulation (i.e. the response of the closed-loop system to disturbances such as PVT variations) will be evaluated. Note that these laws will be designed at the light of implementation constraints (mainly cost) in terms of complexity, area, etc. Actually, the system considered here is intrinsically a Multi-Inputs-Multi-Outputs (MIMO) one. Therefore, its control can be design with NL techniques devoted to MIMO systems in order to ensure the requirements and reject the disturbances. The control of several Voltage and Frequency Islands (VFI) is usually done via a ?central brain? that chooses the voltage and frequency references thanks to a computational workload deadline. For more advanced architectures, the capabilities of each processing element, especially its maximum frequency, can be taken into account. A disruptive approach should be to consider a more distributed control that for instance takes into account the particular state (e.g. temperature) of each VFI neighbours. Control techniques that have been designed for distributed Network Controlled Systems could be adapted to MPSoCs.

Process evaluation of 3rd generation biofuel production from micro-algae

Département Thermique Biomasse et Hydrogène (LITEN)

Laboratoire Technologie de la biomasse

01-01-2011

PsD-DRT-10-5733

karine.froment@cea.fr

CEA contributes to R&D activities in 3rd generation biofuel production from micro-algae by its fundamental research in biology (understanding of biological mechanism and improvement of microorganism performances) led by DSV at CEA Cadarache. LITEN Institute, belonging to CEA/DRT, investigates 2nd biofuel generation, from studies on resources (biomass, waste) up to industrial, economical and environmental integration. This post doc fellow will use the different approaches developed at LITEN/DTBH to : - perform a prospective study on process integration, for biofuel production from micro-algae, - realize a technico-economical study of the more promising process solutions in the 2rd generation domain and industrial use of micro-algae, - estimate the environmental impact (especially CO2) of these processes. This work will take place in in frame of a collaboration of both labs (DSV/IBEB and DRT/LITEN/DTBH), the first one bringing its very fundamental knowledge on technical ability and performance of the micro-organism, the second one giving the knowledge on process and technico-economical evaluation of industrial reactor systems. The post doc fellow, located in Grenoble, will go as needed in Cadarache to discuss with biology experts.

New acoustical transducer inspired by the middle ear for source localization

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Capteurs Fonctionnalisation et Environnement

01-10-2010

PsD-DRT-10-5736

elisabeth.delevoye@cea.fr

The external and middle ears can be seen as a whole system able to convert the acoustical energy from the free field to a semi-confined media dedicated to an efficient transduction of the signals of interest. Among species this configuration is highly dependent on the environment and the usage. The work will focus on the simulation by the finite element method using the COMSOL software of the acoustical coupling of a vibrating membrane placed at the interface between an acoustic wave guide and a semi-confined network of cavities. Methods developed to study the design of microphones are well suited. In particular the methods that help study the impact of a non planar shape of the back of the cavity just behind the vibrating membrane. It will be asked to demonstrate how these configuration help creating optimized set-up condition. In a second phase, design rules inspired by anatomical specificities will be extracted. The optimisation of three parameters is of main interest : directionality, sensitivity to a larger range of input signals and spectral responses within a narrow or large frequency band. In the meanwhile a lumped model based on the acoustic-mechanic-electrical analogy of the complete system will be done on the basis of a preliminary study demonstrating the interest in using a system-level simulation tool (ASYGN) to reproduce the performance of the organ on one side and the artificial transducers inspired from the organ on the other side.

Study and realization of thermal energy harvesting prototypes by thermal/fluidic coupling, and then electrical conversion. Application to electronic circuits.

Département des Technologies des NanoMatériaux (LITEN)

Composants pour la Conversion de l'Energie

01-11-2010

PsD-DRT-10-5740

emmanuel.ollier@cea.fr

The objective of this study is to explore possibilities of using systems with fluidic/thermal coupling to harvest the thermal energy released by an electronic device and then convert it into electricity that can be stored or used again. In those systems, the fluidic can be also used for a cooling purpose. The two main steps will be the design of devices allowing controlling the operating regimes of the fluidic system submitted to a constant heat source (thermo-fluidic coupling) and the characterization of the best coupling conditions with the electrical conversion devices, in particular piezo-electrical. The studies will also explore new mechanisms taking place in the small scale fluidic systems compared to models known macroscopically. The work will be mostly experimental but will also include a simulation part. The study should also provide an estimation of the harvesting efficiency as well as the power densities taking place in this kind of new devices.

Multiscale Modeling of the Degradation Mechanisms in Polymer Electrolyte Fuel Cells

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire des Composants Piles à combustible, Electrolyseurs et Modélisation

PsD-DRT-10-5746

alejandro.franco@cea.fr

In an attempt to provide a rigorous physical-based description of the physicochemical phenomena occurring in the PEFC environments, the Modeling Group at CEA-Grenoble/LCPEM has developed a novel physical multi-scale theory of the PEFC electrodes electro-catalysis,the MEMEPhys model, based on a combined non-equilibrium thermodynamics/electrodynamics approach. This postdoctoral research position will consist on actively contributing on the development of the model, including the implementation of a physical-based description of water transport phenomena and water condensation in the PEFC. Heterogeneities on the electrochemical and aging processes, induced by water transport, will be in particular addressed. The candidate will strongly combine theoretical and experimental data, obtained in our laboratory, in order to establish MEA microstructure-performance relationships and to elucidate the main MEA degradation and failure mechanisms. From a fundamental point of view, this work will provide a deeper understanding of the electrochemical mechanisms responsible of the PEFC active layers aging at different spatiotemporal scales.

Integration Testing with Symbolic Execution for Component-Based Systems

Département Ingénierie Logiciels et Systèmes (LIST)

Laboratoire d'Ingénierie dirigée par les modèles pour les Systèmes Embarqués

01-01-2011

PsD-DRT-10-5747

diane.bahrami@cea.fr

Abstract interpretation of ACSL annotations

Département Ingénierie Logiciels et Systèmes (LIST)

Laboratoire pour la Sûreté du Logiciel

01-01-2011

PsD-DRT-10-5751

pascal.cuoq@cea.fr

Frama-C is a set of tools dedicated to the analysis of C software. In Frama-C, different analyses techniques are implemented as plug-ins within the same framework. Part of the glue that holds the various plug-ins together is the ACSL annotation language. ACSL is a formal specification language for C programs. Each verification plug-in is supposed to interpret ACSL annotations as best it can. A plug-in can also, when it needs to make an assumption, express it as an ACSL property so that another plug-in can be used to verify this assumption. This post-doctoral position consists in improving the precision of Frama-C's value analysis, based on Abstract Interpretation, for constructs that are not currently handled. The treatment of some constructs will require specific abstract domains to be designed. http://frama-c.com http://frama-c.com/value.html http://frama-c.com/acsl.html

Nanoparticle synthesis for photovoltaic appliation

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Chimie et Sécurité des Nanomatériaux

01-01-2011

PsD-DRT-10-5760

olivier.raccurt@cea.fr

Electrochemical device for purifying hydrogen in a reformed gas

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire des Composants Piles à combustible, Electrolyseurs et Modélisation

01-12-2010

PsD-DRT-10-5761

nicolas.guillet@cea.fr

This project aims to establish a new research and development on purification devices for fuel reformers for hydrogen fuel cells. This work is of prime importance for fuel cell systems fed by different sources of hydrogen. Used in "power full" or "range extender" modes, the reformer and gas purification system are elements of the chain that have to be optimized. Objective is to develop an electrochemical device for purifying the gas from a reformer whose basic principle is similar to that of a PEM electrolyzer. The gases from the reformer undergo a selective electrocatalytic oxidation to separate hydrogen and conventional pollutants directly power a fuel cell. The project will focus on selection and characterization of catalysts electrocatalytic performance and the achievement of functional prototypes. These developments will assess the economic relevance of the device vis-à-vis other systems and identify areas of research to develop thereafter.

Simulation of silicon solar cells based on n-type material : modelling and architecture optimisation.

Département des Technologies Solaires (LITEN)

Laboratoire Composants Photovoltaïques

01-01-2011

PsD-DRT-10-5793

philippe.thony@cea.fr

INES is actually developping new fabrication technologies for n-type silicon solar cells. Working on simulation of photovoltaic solar cells enables the speed-up of the developement of new technologies: physical interpretation of characterisation results, support to device design, optimisation of processing steps and evaluation of original designs. This subject open for post-doc position is focused on the study of semi-empirical models for materials and process steps for n-type solar cells. These basic road-blocks will be assembled in a complete model by using a multi-scale simulation tool. In the end, this global model will allow optimising of the p-type emitter geometrical structure, the efficiency of carrier collection on the back side or the geometry of metallisation for electrical contacts.

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Composants Imprimés

01-01-2011

PsD-DRT-10-5842

delphine.boutry@cea.fr

Nanoimprint process development on flexible substrate for electronic and optical applications

Archive des laboratoires DRT (ne pas utiliser)

Laboratoire Composants Imprimés

01-02-2011

PsD-DRT-10-6472

delphine.boutry@cea.fr

This subject aims to develop specific nanoimprint processes for various materials and to apply them to the realization of various components on plastic film. Several themes will be addressed through different materials, on the substrate itself or on a more or less thin layer deposited on a flexible plastic film. An incomplete list of these materials is presented below. They correspond to various potential applications. In the field of electronics, printing processes of dielectric materials will be studied. Particular substrates are also pressed for the creation of OTFT. In the field of optics, the structuring of several conducting polymers with special optical properties is considered for various applications. Some of these polymers belong to the family of PEDOT used also in the field of photovoltaics. The multilayer structure of polymers will be explored for the realization of 3D structures. Finally, the ability to print polymer films loaded nanoparticles will also analyzed.

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