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

PostDocs : selection by topics

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

DM2I (LIST)

Laboratoire de Métrologie de l'Activité

01-05-2019

PsD-DRT-19-0057

valerie.lourenco@cea.fr

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

AlGaN/GaN HEMTs transfert for enhanced electrical and thermal performances

Département Composants Silicium (LETI)

Laboratoire Intégration et Transfert de Film

01-04-2018

PsD-DRT-18-0060

julie.widiez@cea.fr

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

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

Département Composants Silicium (LETI)

Laboratoire Composants Radiofréquences

01-09-2019

PsD-DRT-19-0063

marc.sansaperna@cea.fr

Millimetre-wave 5G systems require increasing modulation complexities as a means to improve data bandwidth, but they are currently limited by the phase noise of local oscillators, based on quartz resonators. Developing high-performance and high frequency reference oscillators, ideally in the GHz range, would address this problem. In this context, reference oscillators based on micro-electromechanical systems (MEMS) represent a privileged way to achieve these specifications The CEA-Leti has proven experience in the development of acoustic-wave MEMS resonators (Reinhardt et al. IEEE-IMSD, 2012) and silicon-based MEMS (Dominguez-Medina et al. Science 2018), with a special focus in low-noise applications (Sansa et al. Nature Nanotech. 2016). This expertise, together with its technological platform (8500m2 of clean room) and unique fabrication processes, make it one of the leading research actors in the field. The post-doc project consists on the development of high-performance reference oscillators in the 1-5 GHz band based on MEMS resonators. The post-doc will start by performing a study and characterization of current MEMS resonators fabricated in the Leti, and will then identify ways to improve their performance. Based on these first results, the post-doc will then be in charge of the design and characterization of a new generation of devices. The candidate will have a PhD in MEMS or acoustic resonators, with experience in characterization, signal processing and physics of the device.

Development of flexible solar panels for space applications

Département des Technologies Solaires (LITEN)

Laboratoire Photovoltaïque à Concentration

01-04-2018

PsD-DRT-18-0066

philippe.voarino@cea.fr

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

Detection of cyber-attacks in a smart multi-sensor embedded system for soil monitoring

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.

FDSOI technology scaling beyond 10nm node

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-11-2018

PsD-DRT-18-0074

claire.fenouillet-beranger@cea.fr

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

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