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

PhD : selection by topics

See all positions [+]

Lithography process for 3D high-resolution patterning

Département des Plateformes Technologiques (LETI)

Laboratoire

01-09-2021

SL-DRT-21-0409

jerome.reche@cea.fr

Emerging materials and processes for nanotechnologies and microelectronics (.pdf)

Since 1960 the CEA-LETI (laboratory of electronics and information technology) is ones of main contributor of French innovation is electronics and new technologies. Its different entities are a real bridge between research and industry. One of them, the DPFT (technological platform department), includes the resources of manufacturing, the control and the associated environment, which allows to set up and to mature new processesto develop the future of electronics. Use of 3D structures to replace planar structures is one way to achieve this plan. Nevertheless, the current 3D structures, which are made and replicated, as microlens used in photonic field, use process scale for micrometer size and the new needs target sub-micronics size. The replication technology as high-resolution nanoimprint could adress this scaling challenge with yield improvement (time and cost reduction). The nanoimprint technology allows replication of 3D structure in one process step inside a functional material, this mean that the material imprint is the final use for application and not an intermediate one. The final aim of the thesis is the realization of 3D structures on a sub-micrometric scale (100 nm to 1 µm) and their replication. This involves firstly the creation of such structures using known but slow technology such as electron beam lithography associated with the transfer techniques in hard materials. Moreover, it will be necessary to characterize these structures at each stage in order to know their precise shape. In a second step, the candidate will be able to try to replicate these patterns with the laboratory nanoimprinting equipment and the various materials and processes already developed in the lab. The replicated structures will be finely characterize to evaluate morphological modification, defectivity obtained or possible non-uniformity. From these results, the candidate will have to implement a detailed analysis potentially associated with design of experiment (DOE) and the use of modeling to adapt the process and the starting structures to obtain the expected replication. The thesis contract will take place over 3 years with a gross monthly salary of 2 043.54? during the 1st and 2nd years, and 2 104.62? for the 3rd year. At the end, the skills developed by the PhD student enable him to work in many high technology sectors such as nano and microelectronics, materials chemistry or more generally data processing field.

Download the offer (.zip)

New physical layer on millimeter wave band for 5G-NR IoT

Département Systèmes (LETI)

Laboratoire Communication des Objets Intelligents

01-10-2021

SL-DRT-21-0410

valerian.mannoni@cea.fr

Communication networks, IOT, radiofrequencies and antennas (.pdf)

A new 5G air interface is to be designed, in order to address good reliability and acceptable latency service for IoT use cases not addressed yet by Cellular IoT technologies. This new 5G air interface is the subject of a study item in 3GPP release 17 and has been called NR_REDCAP (Reduced Capability NR devices). The ability to operate NR-Light on millimeter wave band is seen as required for Industry 4.0 applications and attractive for private networks due to its limited range and high spatial reuse. The objective of the PhD thesis is then to propose and investigate a new physical layer on millimeter wave band for 5G-NR IoT meeting the above challenges. The expected results are: - A better understanding of challenges and key enablers of 5G NR in millimeter wave band - Proposal of a new physical layer for 5G-NR IoT with the associated MIMO scheme - Proposal and study of the multiple access scheme based on MIMO - Identification and assessment of key NR-Light enablers in millimeter wave band to fulfill these requirements and reach the reduced complexity and cost target of NR-Light UEs while mitigating the performance degradation of such complexity reduction, for example coverage degradation.

Download the offer (.zip)

Superconductor Integration for thermal management of quantum computing and spatial multi-chip platforms

Département Composants Silicium (LETI)

Laboratoire Packaging et 3D

01-09-2021

SL-DRT-21-0411

jean.charbonnier@cea.fr

New computing paradigms, circuits and technologies, incl. quantum (.pdf)

As part of Quantum Silicon Grenoble project, teams at CEA-LETI, CEA-IRIG and Néel Institute aim at building a quantum accelerator with silicon spin quantum bits (qubits). Compatible with large-scale production, existing integration processes on Si are a real advantage for the scalability of these qubits. The extreme qubit operating conditions (cryogenic temperatures =1K, high frequencies in the range of a few GHz, high signal density) require the development of adapted technological building blocks. To interconnect the qubits and the controlled circuits, integration of superconducting metals is promising. Indeed, their vanishing resistance at low temperatures and the low thermal conductivity of superconductors also enables to protect the qubits from the heat generated by the control electronics circuits integrated close-by. Note that these developments will also benefit spatial applications sharing similar operating constraints. The thesis will focus on: 1) Studying the superconducting properties of Nb, NbN, TiN, Al and any combination of these materials during integration processes to optimize them for a single level of routing and multilayers pads. Establishing low temperature compatible thermal conductivity measurement set-up, protocol and sample design. 2) Transferring the acquired knowledge in term of integration and thermal conductivities to develop the next generation of multi-chip platform hosting qubits and control electronics circuits. The PhD student will be part of the 3D integration and packaging lab of CEA-LETI (Grenoble) and will interact very closely with the Spectral-imaging laboratory for space science at CEA-IRFU (Saclay) for thermal conductivity measurements.

Download the offer (.zip)

Wearable dynamic fluidic chamber dedicated to transcutaneous monitoring of oxygen and carbon dioxide blood concentration

Département Microtechnologies pour la Biologie et la Santé (LETI)

Laboratoire Systèmes Pour la Personne

SL-DRT-21-0415

rodrigue.rousier@cea.fr

Health and environment technologies, medical devices (.pdf)

The development of wearable medical devices is a fundamental and essential in order to promote ambulatory medicine. So-called "conventional" as opposed to outpatient medicine commonly uses blood gas analysis to assess the efficiency of pulmonary exchanges and diagnose respiratory diseases. In particular, it detects an abnormal change in the oxygen and carbon dioxide concentrations in arterial blood going to the tissues. Since this analysis requires a blood test, it is therefore an invasive method and does not allow monitoring of concentrations in real time. An alternative to taking blood is a transcutaneous gas analysis, i.e. measuring the concentrations of gases that diffuse through the skin. This method is non-invasive and guarantees continuous monitoring of blood gases. The objective of this thesis is to study and develop an instrumented wearable dynamic fluidic chamber. This chamber will measure in real time the concentrations of oxygen and carbon dioxide which diffuse through the skin. The work will consist in modeling the gas exchanges between the skin and the fluidic chamber, then designing and instrumenting the chamber and finally testing it on a gas test bench. This subject requires a highly motivated person with skills in simulation, medical device design and instrumentation.

Download the offer (.zip)

Hybrid representation of polarising topics in political news

Département Intelligence Ambiante et Systèmes Interactifs (LIST)

Laboratoire Analyse Sémantique Textes et Images

01-02-2021

SL-DRT-21-0419

julien.tourille@cea.fr

Artificial intelligence & Data intelligence (.pdf)

Existing recommendation algorithms tend to create filter bubbles which reduce the diversity of information proposed to users and lead to polarized opinions. This functioning mode is problematic particularly for domains such as politics, in which balanced and diversified information is needed to fuel a healthy debate. The main objectives of this PhD are to: (1) automatically detect topics which are prone to polarization, (2) propose new text representations which combine objective and subjective description criteria, (3) update the representations to take into account the highly dynamic nature of political texts and (4) propose new datasets and evaluation protocols which are adapted for the methods introduced in the paper. The results of the PhD work will constitute the entry point for diversified recommendation algorithms which aim to open the filter bubbles.

Download the offer (.zip)

Elastic wave sensors for field biological detection

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-09-2021

SL-DRT-21-0437

alexandre.reinhardt@cea.fr

Health and environment technologies, medical devices (.pdf)

Monitoring of the sanitary quality of water becomes increasingly a public health issue. In this context, CEA-LETI is developping sensors to detect bacteria in liquid samples. Among the technologies under investigation, electromechanical elastic wave sensors appear as particularly promissing. The aim of this PhD is to evaluate the use of such components, initially developped for radiofrequency signal processing, to biological detection in liquid samples. More precisely, the PhD subject proposed aims in a first stage at analysing the biological structures we want to detect, their possible interactions with a sensors and the associated detection mechanisms which could be exploited. This will allow the design of suitable sensors, by selecting the type of resonator, the vibration mode leading to the highest sensitivity and compatible with operation in liquids, and a scheme for the electronic readout of the sensor output. The candidate will then fabricate prototypes in the CEA-LETI clean rooms and will functionalize them and evaluate their performance in the laboratory. Ultimately, the sensors will be adapted so that they can be integrated in a multi-sensors detection platform developped in parallel by the CEA-LETI teams.

Download the offer (.zip)

137 Results found (Page 5 of 23)
first   previous  3 - 4 - 5 - 6 - 7  next   last

See all positions