All opportunities

Offers : 35

Design of pancreas on a chip

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Start date : 1 January 2018

offer n° PsD-DRT-19-0032

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

The post doc will have to work in close collaboration with several collaborators and other post docs on this interdisciplinary topic.

  • Keywords : Engineering science, Life Sciences, Cellular biology, physiology and cellular imaging, Instrumentation, DTBS, Leti
  • Laboratory : DTBS / Leti
  • CEA code : PsD-DRT-19-0032
  • Contact : fabrice.navarro@cea.fr

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

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Start date : 1 August 2019

offer n° PsD-DRT-18-0056

The Compact / SPICE model is the link between the development of technological bricks and circuit design. The model purpose is to accurately reproduce the experimental characteristics essential to digital, analog and mixed circuit design. But today we need deeper investigation to set up the specifications of models for such device, in order to provide adequate tools to help circuit designers building up quantum circuits.

The main challenge is to be able to describe the quantum behavior of this architecture. It will also be necessary to study if this behavior must be described via the physical quantities (eg electronic spin, energy level …) or by logical quantities (quantum state, matrix of transformation, …). It will also be necessary to take into account the compatibility between the mathematical formalism and the standard tools of compact modeling (through Verilog-A description).

Following recent experimental research activities (between CEA and CNRS) concerning the first demonstration of hole spin qubit on SOI, we propose first to investigate how to model such device through macro modeling approach where SET compact model, inclusion of magnetic spin degeneracy and management of RF excitation are main steps.

The challenges in regards to literature are inclusion of magnetic field in SET model, description of resonant tunneling, RF excitation of SET and reproduction of Rabi oscillations.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, DCOS, Leti
  • Laboratory : DCOS / Leti
  • CEA code : PsD-DRT-18-0056
  • Contact : sebastien.martinie@cea.fr

Nano-silicon/graphene composites for high energy density lithium-ion batteries

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Start date : 1 May 2018

offer n° PsD-DRF-18-0052

This postdoctoral fellowship is part of the Graphene Flagship Core 2 H2020 european project (2018-2020) on the energy storage applications of graphene. In lithium-ion batteries, graphene associated to nanostructured silicon in a proper composite helps increase the energy capacity. Indeed graphene wraps silicon, reducing its reactivity with electrolyte and the formation of the SEI passivation layer. It also maintains a high electrical conductivity within the electrode.

The study will compare two technologies: graphene-silicon nanoparticles and graphene-silicon nanowires. The former composite, already explored in the above mentioned project, will be optimized in the present study. The latter is a new kind of composite, using a large scale silicon nanowire synthesis process recently patented in the lab. The postdoc will work within two laboratories: a technological research lab (LITEN) with expertise in batteries for transportation, and a fundamental research lab (INAC) with expertise in nanomaterial synthesis.

The postdoc will synthesize silicon nanowires for his/her composites at INAC. Following LITEN know-how, she/he will be in charge of composite formulation, battery fabrication and electrochemical cycling. He/she will systematically compare the electrochemical behavior of the nanoparticle and nanowire based silicon-graphene composites. Comparison will extend to the mechanism of capacity fading and SEI formation, thanks to the characterization means available at CEA Grenoble and in the European consortium: X-ray diffraction, electronic microscopy, XPS, FTIR, NMR spectroscopies. She/he will report her/his work within the international consortium (Cambride UK, Genova Italy, Graz Austria) meetings.

A 2-year post-doctoral position is open.

PhD in materials science is requested. Experience in nanocharacterization, nanochemistry and/or electrochemistry is welcome.

Applications are expected before May 31st, 2018.

  • Keywords : Engineering science, Materials and applications, Ultra-divided matter, Physical sciences for materials, INAC, SyMMES
  • Laboratory : INAC / SyMMES
  • CEA code : PsD-DRF-18-0052
  • Contact : pascale.chenevier@cea.fr

Tunnel Junction for UV LEDs: characterization and optimization

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Start date : 1 September 2018

offer n° PsD-DRT-18-0047

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).

  • Keywords : Solid state physics, surfaces and interfaces, DOPT, Leti
  • Laboratory : DOPT / Leti
  • CEA code : PsD-DRT-18-0047
  • Contact : guy.feuillet@cea.fr

In situ synchrotron X-ray monitoring of the growth of defect-free two-dimensional materials by liquid-metal catalytic routes

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Start date : 1 January 2018

offer n° PsD-DRF-18-0009

The postdoctoral research project is part of a four-year European FET-Open project called LMCat (http://lmcat.eu/) bringing together five European labs, including the ESRF and the CEA-INAC, to develop the growth of defect-free two-dimensional materials by liquid-metal catalytic routes. A central lab will be established at the ESRF to develop an instrumentation/methodology capable of studying the ongoing chemical reactions on the molten catalyst. The growth by chemical vapor deposition at high pressure and temperatures will be characterized in situ, by means of two main techniques: Raman and X-ray scattering (Grazing Incidence X-Ray Scattering and Reflectivity). It will be complemented by theoretical calculations performed in Munich. The successful candidate will be in charge; together with a PhD student, of the in situ synchrotron X-ray scattering measurements, using the ESRF ID10 liquid scattering beamline (http://www.esrf.eu/UsersAndScience/Experiments/CBS/ID10) and the P08 beamline of PETRA-III (photon-science.desy.de/facilities/petra_iii/beamlines/p08_highres_diffraction/index_eng.html), in Desy.

You should hold a PhD in physics, chemistry or material science or closely related science. Previous experience of complex instrumental environment, MBE or CVD growth methods and / or with synchrotron X-ray scattering / diffraction / reflectivity, especially on liquids, will be an advantage. You should be motivated to work with an international team of young researchers with an experimental setup at the forefront of instrumental development, and ready to travel in Germany (Hambourg) for extended periods to perform some of the experiments. A good practice of English is mandatory. You should also have:

This is a full time, 3 year contract.

Please submit a 1 page cover letter stating the motivation, research experience and goals, ; a curriculum vitae, and contact information for 3 references.

  • Keywords : Solid state physics, surfaces and interfaces, INAC, MEM
  • Laboratory : INAC / MEM
  • CEA code : PsD-DRF-18-0009
  • Contact : gilles.renaud@cea.fr
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