Scientific Direction
Transfer of knowledge to industry
Scientific Direction
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.
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.
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)
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.
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.
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.
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.
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?).
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.
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)
Laboratoires des fondements des systèmes Temps réel Embarqués
01-03-2014
PsD-DRT-14-0018
julien.herve@cea.fr
The TSUNAMY project aims at thinking the design of future manycore chips in a collaborative hardware/software approach. It will investigate how crypto-processors can be incorporated into such a chip, turning it into a heterogeneous architecture, where scheduling, resource allocation, resource sharing, and resource isolation will be a concern. The LaSTRE laboratory has designed Anaxagoros, a micro-kernel which ensures good properties in terms of safety and integration of mixed-criticality applications and is therefore well suited to the virtualization of operating systems. Making this virtualization software layer evolve in the context of the TSUNAMY project is the main goal of this post-doctoral proposal. The first issue to address deals with the scalability of Anaxagoros on a manycore architecture. This system was designed with multicore scalability in mind : to help reach the highest level of parallelism in a lock-free fashion, innovative techniques were proposed to minimize the amount of synchronization points within the system. This is the first step, but scaling to manycore architectures brings new topics such as cache-coherency or non-uniform memory access that require to focus on data locality as well. The second challenge will be to incorporate genuine security features into Anaxagoros, e.g. regarding protection from covert channels, or confidentiality. The third and final challenge that will be addressed through interactions with the partners of the project is to devise techniques that could be implemented directly in hardware in order to ensure that even a breach in what is usually considered as trusted software will not allow an attacker to gain unprivileged data access or let information leak.
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.
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.
Département Composants Silicium (LETI)
Laboratoire Masques et Design Kits
01-01-2016
PsD-DRT-16-0023
fabien.gays@cea.fr
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.
Département d'Optronique (LETI)
Laboratoire des Matériaux pour la photonique
01-01-2018
PsD-DRT-18-0025
philippe.ballet@cea.fr
The intrinsic spin-momentum locking of Dirac fermions at the surface or interface of topological insulators opens the path towards novel spintronic effects and applications. Strained HgTe/CdTe is a model topological insulator and a very good candidate to design and demonstrate new spintronic devices exploiting the very large charge to spin conversion efficiency expected for such 2D systems. This postdoc position aims at realizing the first demonstration of the direct charge to spin conversion in topological HgTe nanostructures and use this demonstration as a building block for spin based logic elements.
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.
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
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.
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.
Département technologies silicium (LETI)
Autre laboratoire
01-03-2017
PsD-DRT-17-0032
eugenie.martinez@cea.fr
This project will focus on understanding plasma-induced damage at the sidewalls of micro-nano-patterned III-V semiconductors to find relevant technological solutions capable to minimize this damage. There is a clear need of knowledge on by which mechanisms and to what extent the plasma etching process modifies the III-V pattern sidewalls and the consequences it has on the device optical performances. The selected III-V semiconductor will be aluminium gallium arsenide which exhibits excellent optoelectronic properties and strong nonlinear parametric gain. The student will be mainly focused on understanding how the key plasma process parameters influence the structural and chemical changes at the III-V sidewalls, as well as changes of optical properties. This will require the development of a methodology for a 3D quantitative characterization of the sidewalls at the nanoscale, based on Auger microscopy and cathololuminescence. The main objective will be to correlate plasma-induced structural defects and modifications of the optoelectronics properties. The second step will consist in developing optimized plasma etching processes for III-V semiconductors, exploring alternative plasma technologies. You will also be involved in the development of processes for restoring and passivating the AlGaAs sidewalls.
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.
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.
DM2I (LIST)
Laboratoire Capteurs et Architectures Electroniques
01-05-2013
PsD-DRT-13-0035
stephane.normand@cea.fr
This subject aims at developing new methods of X/gamma-ray spectrum analysis for the characterization of uranium-bearing ore, enabling to process data obtained in the framework of nuclear mining activities. This subject will be developped into two parts. The first part will concern the processing of complex gamma-ray spectra, obtained using different types of medium-resolution scintillators (such as NaI or LaBr3 detector). The main purpose of this part will be related to the processing of complex regions of interest using deconvolving methods by non-parametric Bayesian inference, notably by using the SINBAD code, initially developed by CEA LIST for the processing of HPGe spectra. The second part of the subject will concern the analysis of low-resolution spectra obtained using a NaI detector in order to obtain a spectrometric information. In this case, a traditional approach based on the analysis of photoelectric peaks is not conceivable. The problem will be studied in the form of an inverse problem using a model of the detector response and a reconstruction, using an approach analogous to computed tomography. The performances of different types of reconstruction algorithms will be studied (EM analysis, non-parametric Bayesian approach).
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.
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)
Laboratoire Intégration Gestion d'Energie Capteurs et Actionneurs
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.
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.
Archive des laboratoires DRT (ne pas utiliser)
Laboratoire de Substrats Avancés
01-01-2012
PsD-DRT-12-0041
julie.widiez@cea.fr
Double transfer of thin single crystalline processed layer can be very interesting for all technologies that require front and back side engineering of the silicon active film. With the increase of the electronical system complexity, this alternative technology can offer new opportunities to miniaturize the semiconductor devices. To fulfill such requirements, a recent alternative technology was developed at the CEA-LETI, based on the use of porous silicon substrates [1]. This new technology will be of a great interest for 3D integration, back-side imager but also MEMS or photovoltaics applications. This technology should now be validated at a larger scale, and we need to focus on all involved mechanisms such as the porous silicon layer rupture. In a first place, the applicant should comprehend the specification of porous materials in thin film configuration, including elaboration steps and distinctive properties of transferred porous layers. Subsequently he/she may need to interact with Leti's technological experts to determine process improvements to be implemented to reach pre-established specifications of desired prototypes. In order to evaluate and recommend appropriate materials and equipments, he/she may need to extensively focus on the behaviour of porous material under specific stress conditions such as chemical, thermal or mechanical solicitations. The purpose is to ensure compliance to Smart Cut or Smart stacking technologies that involve amongst others processes molecular bonding technology. Later, the effort should be focused on the development of a specific technology to induce the mechanical separation inside the buried porous silicon layer. One line of approach would be to trigger the mechanical separation by ultrasound solicitation. Understanding the mechanisms of the splitting and characterising the resulting structures are part of the expected work to be completed in this project. [1] A-S.Stragier et al., JECS,158 (5) H595-H599 (2011)
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)
Laboratoire Infrastructure et Ateliers Logiciels pour Puces
01-02-2018
PsD-DRT-18-0042
remy.gauguey@cea.fr
The context of this subject is the development of autonomous vehicles / drones / robots. The vehicle environment is represented by a 3D occupancy grid, in which each cell contains the probability of presence of an object. This grid is refreshed over time, thanks to sensor data (Lidar, Radar, Camera). Higher-level algorithms, like path planning or collision avoidance, think in terms of objects described by their path, speed, and nature. It is thus mandatory to get these objects from individual grid cells, with clustering, classification, and tracking. Many previous publications on this topic comes from the context of vision processing, many of them using deep learning. They show a big computational complexity, and do not benefit from occupancy grids specific characteristics (lack of textures, a priori knowledge of areas of interest?). We want to explore new techniques, tailored to occupation grids, and more compatible with embedded and low cost implementation. The objective of the subject is to determine, from a series of 3D occupation grids, the number and the nature of the different objects, their position and velocity vector, exploiting the recent advances of deep learning on unstrucured 3D data.
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)
Laboratoire Calcul Embarqué
01-01-2016
PsD-DRT-16-0045
kods.trabelsi@cea.fr
The purpose of the study is to prepare the next generation of OR solvers. We will study the hardware acceleration possibility based on FPGA to run some or all of the OR algorithm. The blocks for which such a solution is not effective can be parallelized and executed on a standard computing platform. Thus, the proposed runtime correspond to a standard computing platform integrating FPGA. To access to this platform we require a set of tools. These tools should provide features such as (a) analysis and pre-compiling an input or problem or sub-problem of OR, (b) HW / SW partitioning and dedicated logic optimization and finally (c) generating an software executable and a bitstream. The first step will be to find OR algorithms that are well suited for hardware acceleration. We then propose a HW / SW partitioning methodologies for different classes of algorithms. The results will be implemented to lead to a compilation prototype starting from an OR instance and generating a software executable and a bitstream. Theses results will be implemented and executed on a computing platform integrating FPGA to evaluate the performance gain and the impact on the energy consumption of the proposed solution.
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).
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.
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.
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.
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.
Département des Technologies Solaires (LITEN)
01-10-2014
PsD-DRT-14-0056
QuocTuan.Tran@cea.fr
In the solution concerning residential or tertiary sites that consume and produce electrical energy , the objective is to optimize the use of energy based on economic criteria or constraints networks (adaptation of the consumption) without introducing perturbations of user comfort. The purpose of this position is to develop a solution for "optimal management of the use of solar energy in a tertiary building integrating EV charging stations and storage." according to three objectives: - Minimize the cost of consumption based on a dynamic tarif - Maximize the use of solar energy - Minimize the power demand of the network. Taking into account the LCOS (levelised Cost Of Storage) of battery . The Post- Doc will contribute and participate in: - Specification of tertiary system - Development of algorithms for managing a tertiary system - Deploy and test the proposed solution.
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.
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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.
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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?
Département Thermique Biomasse et Hydrogène (LITEN)
Laboratoire Systèmes Solaires Haute Température
01-01-2015
PsD-DRT-14-0064
francois.boudehenn@cea.fr
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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.
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.
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.
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)
Laboratoire Infrastructure et Ateliers Logiciels pour Puces
01-04-2019
PsD-DRT-19-0071
anca.molnos@cea.fr
The post-doc is concerned with the application of machine learning methods to detect potential cyber-security attacks on a connected multi-sensor system. The application domain is the agriculture, where CEA Leti has several projects, among which the H2020 project SARMENTI (Smart multi-sensor embedded and secure system for soil nutrient and gaseous emission monitoring). The objective of SARMENTI is to develop and validate a secure, low power multisensor systems connected to the cloud to make in situ soil nutrients analysis and to provide decision support to the farmers by monitoring soil fertility in real-time. Within this topic, the postdoc is concerned with the cyber-security analysis to determine main risks in our multi-sensor case and with the investigation of a attack detection module. The underlying detection algorithm will be based on anomaly detection, e.g., one-class classifier. The work has tree parts, implement the probes that monitor selected events, the communication infrastructure that connects the probes with the detector, and the detector itself.
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.
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.
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.
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.
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.
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.
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.
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 ...).
Département Ingénierie Logiciels et Systèmes (LIST)
Labo. ingénierie des langages exécutables et optimisation
01-06-2019
PsD-DRT-19-0088
flroian.noyrit@cea.fr
Model-Based System Engineering relies on using various formal descriptions of the system to make prediction, analysis, automation, simulation... However, these descriptions are mostly distributed across heterogeneous silos. The analysis and exploitation of the information are confined to their silos and thereby miss the big picture. The crosscutting insights remain hidden. To overcome this problem, ontologies and knowledge engineering techniques provide desirable solutions that have been acknowledged by academic works. These techniques and paradigm notably help in giving access to a complete digital twin of the system thanks to their federation capabilities, in making sense to the information by embedding it with existing formal knowledge and in exploring and uncovering inconsistencies thanks to reasoning capabilities. The objective of this work will be to propose an approach that gives access to a complete digital twin federated with knowledge engineering technologies. The opportunities and limits of the approach will be evaluated on industrial use cases.
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.
DM2I (LIST)
Laboratoire de Métrologie de l'Activité
01-09-2019
PsD-DRT-19-0090
marie-christine.lepy@cea.fr
The activity measurement of X-ray emitting radionuclides in the energy range below 100 keV encounters several difficulties that limit the accuracy of the result. These include the difficulty of calibrating detector performance and, in general, the significant uncertainties associated with emission intensities X. In addition, the self-absorption effects of X-rays in standard sources or samples lead to important corrections that must be controlled. Among the important applications of X-emitter measurement, reactor dosimetry, which makes it possible to determine the neutron fluence received during irradiation and to characterize its spectrum, is based on the analysis of the activity of irradiated dosimeters. These are made of pure metals or alloys of perfectly known compositions, some of which are activated or fissioned by neutrons. For example, reactions 93Nb(n,n')93Nbm and 103Rh(n,n')103Rhm are of prime importance for reactor dosimetry and are particularly interesting for characterizing neutron fluxes around 1 MeV. The proposed work follows a thesis that identified several areas for improvement in dosimeter measurement that will need to be implemented, including : - improvement of radionuclide X-ray emission data used as standard for calibration (133Ba, 152Eu, etc.) to establish a consistent set of data; - validation of corrective coefficients due to the presence of impurities during dosimeter irradiation; - evaluation and publication of the decay scheme of 103Pd and 103mRh; - implementation of a new method of performance calibration using monochromatic radiation.
Archive des laboratoires DRT (ne pas utiliser)
Laboratoire Composants Logiques
01-10-2016
PsD-DRT-16-0092
claire.fenouillet-beranger@cea.fr
Département Systèmes
Laboratoire Capteurs Haute Performance
01-10-2019
PsD-DRT-19-0093
agustin.palacioslaloy@cea.fr
The purpose of the post-doctorate is to contribute to the development of magnetometer networks with helium optical pumping, magnetoencephalography (MEG) and magneto-cardiography (MCG). This will involve both theoretical and experimental work to improve a first prototype of medical magnetic imager, based on optically pumped magnetometers. This technology is derived from a product developed for space applications, and implemented on satellites currently orbitting. This work aims to bring this technology to the medical imaging market, through the creation of a CEA-Leti start-up. This work will be carried out in a multidisciplinary team, composed of researchers, experienced engineers, as well as PhD or post-doctorate students, specialized in the fields of optics / laser, magnetic and electronic instrumentation (there are 3 positions opened). This work will also rely on collaborations with medical research teams in neurology / cardiology. In particular, the candidate will have to participate in measurement campaigns in hospitals, in partnership with doctors and medical engineers. The purpose of these measurements is to lead the candidate to propose and implement improvements on the prototype magnetic imager used for measurements.
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.
DM2I (LIST)
Laboratoire Capteurs Diamants
01-01-2020
PsD-DRT-19-0096
emmanuel.scorsone@cea.fr
The postdoctoral researcher will work in the framework of the H2020-CURSOR project funded by the European Commission. This project will start in September 2019 and focus on the development of miniaturized robotic equipment and advanced sensor technologies for search and rescue operations. The main task of the candidate will be to integrate off-the-shelf and/or experimental chemical sensors onto miniaturized robots developed by another partner of the CURSOR consortium, in strong collaboration with chemical sensors specialists. This will include the development of dedicated read-out and data communication electronics, power management, data processing e.g. using multiparametric data analysis algorithms, etc. The developments will take into account a number of challenges with respect to the usage case (weight and size limitations, autonomy, resilience in harsh environments, etc.). The candidate will also take part in the various technical meetings with the other consortium members, writing of deliverables, and possibly field testing.
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.
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.
Département Imagerie Simulation pour le Contrôle (LIST)
Laboratoire Méthodes CND
01-01-2020
PsD-DRT-19-0099
olivier.mesnil@cea.fr
In non-destructive ultrasonic testing, multi-element sensors are used for the inspection of structures to ensure the safety of people and infrastructures. Currently, one of the driving factor of an ultrasonic method is the number of elements of the sensor, influencing the speed and efficiency of the inspection but also the cost and the volume of the equipment. This project aims at developing a prototype of a multi-element sensor with a limited number of elements compared to current state of the art equipment, without losing imaging resolution. To achieve this goal, Compressed Sensing (CS), a recent technique of signal processing allowing to go beyond the traditional sampling theorems and to reconstruct data from severely undersampled measurements, will be used. The ultrasonic inspection procedure will need to be entirely rethought to meet the CS requirements, specifically the sparsity of the measured data and the incoherence of the measurement process. The expected results is a significant reduction (of the order of 5) of the number of elements to conduct imaging, which would be a true revolution in NDT with direct applications in various industrials sectors. The following laboratories, all located in Saclay (France) of the CEA (the French atomic commission), will participate to the project: the NDT department for its expertise in multi-element ultrasonic testing and Neurospin and Cosmostat for their expertises in the field of CS, mainly applied to medical RMI imaging and astrophysics, respectively. The collaboration between these three labs, each among the worldwide leading institutes in their respective fields, will ensure the creation of a new and disruptive family of sensors.
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.
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.
DM2I (LIST)
Laboratoire Modélisation et Simulation des Systèmes
01-01-2020
PsD-DRT-19-0103
eric.barat@cea.fr
Very recently, Bayesian statistical researchers have suggested an alternative way to learn from large datasets. First, they move away from the conventional framework of Bayesian inference by replacing the generative model with a nonparametric prior directly related to the data distribution. The parameters are then inferred by minimizing a bunch of randomized costs functions. As part of this 18-month post-doctoral fellowship (Physicancer project, led by IGR), we propose to assess the problem of PET/MRI reconstruction in this Bayesian nonparametric learning framework. The study covers the performance assessment of the approach on realistic synthetic dataset by comparison to conventional techniques. Transfer to the Castor environment will be considered in collaboration with researchers of SHFJ. In addition, an analysis of the asymptotic properties of this estimator (concentration of the posterior distribution) will be carried in collaboration with the Laboratoire de Mathématiques d'Orsay (LMO).
Département Microtechnologies pour la Biologie et la Santé (LETI)
Laboratoire Chimie des Matériaux et des Interfaces
01-02-2020
PsD-DRT-19-0104
olivier.constantin@cea.fr
This project proposes to develop an array of highly sensitive and specific detectors, based on nanowire photodetectors to target single molecule detection (SMD) and biological analysis applications involving a protocol without amplification. Nanowire arrays have the potential to improve the detection limit of DNA strands functionalized with quantum dots markers, without the need for amplification. They are CMOS compatible and will allow ultra-compact integration. Thanks to their fast response and the ability to create dense arrays over large areas, nanowire photodetector are therefore an interesting approach to detecting rare events (SMD). Nanowire geometry is an interesting approach to optimize the speed-response trade-off. The first objective of this project will be to explore the physical mechanisms that determine the performance of semiconductor nanowire photodetectors at the level of a single nanowire and then on an array of nanowire photodetectors. The biofunctionalization of this array and its hybridization with labelled DNA strands will be explored.
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.
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.
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.
DM2I (LIST)
Laboratoire Informations Modèles et Apprentissage
01-09-2012
PsD-DRT-12-0113
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 SIGMA 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), by taking into account spatial constraints using Geographic Information Systems (GIS) and by considering simplified physical models of transport and recovery of heat. The post-doc's goal is to design mechanisms for dynamically allocating resources that consider the geographical information from the 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 coupling with a GIS should allow implementing self-configuration mechanisms for the management of different networks and different levels of granularity obtained by reduction of the original GIS. The MAS should dynamically establish the link between the suitable simplified models and the desired level of granularity and then it will create the agents needed to represent the system.
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.
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.
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.
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
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?).
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.
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.
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.
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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.
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
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.
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.
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.
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.
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.
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.
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
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
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
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
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.
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
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.
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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
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
Département des Technologies des NanoMatériaux (LITEN)
Laboratoire Chimie et Sécurité des Nanomatériaux
01-01-2011
PsD-DRT-10-5760
olivier.raccurt@cea.fr
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.
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
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.
