Thesis, internship, and post-doc opportunities
261 results found
[Thèse]
Diffusion and rheology of ionic liquid based electrolyte for lithium batteries
Offer N°: 5490
The lithium batteries are currently developped at CEA for theapplication to electric vehicles with an important car constructor. Lithium batteries are mainly constituted of two electrodes positive and negative and an electrolyte. The currently used electrolyte is a lithium salt dissolved in a carbonate solvent and a co-solvant (ether type) for minimizing the viscosity and insuring a large ionic conductivity.
The lithium batteries are currently developped at CEA for theapplication to electric vehicles with an important car constructor. Lithium batteries are mainly constituted of two electrodes positive and negative and an electrolyte. The currently used electrolyte is a lithium salt dissolved in a carbonate solvent and a co-solvant (ether type) for minimizing the viscosity and insuring a large ionic conductivity. For electrochemical stability and security reasons, new electrolyte based on ionic liquid are developped. It appears necessary to understand the transport properties and the rheological properties of these new systems over the requireed temperature range. The PhD thesis will be devoted to characterize the rheological properties of new ionic liquid systems with or without co-solvents and the diffusion properties will be determined using nuclear Magnetic Resonance and neutron quasielastic techniques.
[Thèse]
Optical micro spectrometer integrated on silicon
Offer N°: 2629
This goal of this subject is to develop a new family of micro spectrometers based on the SWIFTS (Stationary Waves Integrated Fourier Transform Spectrograph) principle. This principle consists in sampling with photodetectors stationary waves generated by a reflection at the end of an optical waveguide, in order to obtain instantaneously, and statically an optical spectrum by Fourier Transform.
This goal of this subject is to develop a new family of micro spectrometers based on the SWIFTS (Stationary Waves Integrated Fourier Transform Spectrograph) principle. This principle consists in sampling with photodetectors stationary waves generated by a reflection at the end of an optical waveguide, in order to obtain instantaneously, and statically an optical spectrum by Fourier Transform.
Such a device uses a very small volume, but thanks to the recent progress in silicon photonics technology, it is possible to consider its integration on silicon, for better performances at a reduced price and an in ultimate small volume, enabling new applications such as portable gaz analyzer, spectrometric endoscope for diagnostic, spatial applications, spectroscopic imagery, etc…
The goal of this thesis is therefore to design, realize on silicon, and characterize a micro spectrometer integrated on silicon based on SWIFTS.
[Thèse]
In line characterization and study of spatial deformity generated by stress during MEMS fabrication yielding to their damage
Offer N°: 2627
Performances and fabrication improvements of MEMS yield to an increase of their miniaturization. While their dimension shrink the stress and deformation to which they are submitted become more and more important. So there is a real need to characterize and monitor Microsystems deformations and link them to their performances and integrity at fabrication time.
Performances and fabrication improvements of MEMS yield to an increase of their miniaturization. While their dimension shrink the stress and deformation to which they are submitted become more and more important. So there is a real need to characterize and monitor Microsystems deformations and link them to their performances and integrity at fabrication time. The aim of the thesis is to implement a characterisation toolbox (technique + model) which could be use in-line to monitor the dimension changes and mechanical properties of Microsystems and their constitutive materials. A complementary part will include numerical experiments to understand furthermore the effects of fabrication conditions on MEMS mechanical properties.
[PostDoc]
Implementation of state of the art nano-Auger electron spectroscopy and application for chemical characterization of advanced nano-devices
Offer N°: 2619
The LETI Institute (French Atomic Authority, Technological Research Division, Grenoble) in collaboration with the Lavoisier Institute (CNRS, Paris/Versailles), proposes a one year post-doc position (renewable for one year) to implement Auger electron spectroscopy and imaging and apply it to nanostructures for microelectronics applications.
The LETI Institute (French Atomic Authority, Technological Research Division, Grenoble) in collaboration with the Lavoisier Institute (CNRS, Paris/Versailles), proposes a one year post-doc position (renewable for one year) to implement Auger electron spectroscopy and imaging and apply it to nanostructures for microelectronics applications.
Both LETI and Lavoisier Institute have engaged a collaboration dealing with the implementation of state of the art Auger nano-probes in their respective laboratory for chemical characterizations of innovative materials and devices at the nanometric scale. The post-doctoral fellow will help both institutes to develop specific protocols in order to reach optimal performances in terms of lateral and depth resolutions.
The work-plan will require the post-doc to spend half of the time at the Lavoisier Institute and half of the time at LETI (Minatec Nanocharacterization Platform) in Grenoble. The candidate will benefit from a full scientific and technological support from both laboratories, with access to complementary techniques such as x-ray photoelectron spectroscopy (XPS) and –spectromicroscopy (XPEEM) as well as STEM coupled with EDX or EELS.
The work plan is divided into two main items:
- i) Use of the Auger nano-probe that is currently being installed at the Lavoisier Institute for microelectronics applications. The work will consist in selecting appropriate samples that will serve as references and in developing protocols to reach optimized lateral and depth resolutions. Complex issues such as beam damage, impact of the topography and cross-section analysis will be addressed.
- ii) Transfer and use of such protocols on the LETI equipment for the characterization of innovative nano-structures such as integrated devices with complex 3D architectures. The candidate is expected to identify and prepare the best specimens to highlight the benefits of the technique. Results will be compared to other complementary techniques (XPS, XPEEM, TEM-EELS). The candidate will be integrated in the Minatec Nanocharacterization Platform with a wide range of complementary characterization techniques. He (she) will benefit from partnerships with industrials and academic laboratories in order to favour professional integration.
The candidate should have a solid grounding in semiconductor physics and material science. A good experience in physico-chemical characterizations such as electron microscopy, Auger electron spectroscopy or photoemission spectroscopy is a big advantage. French or good English speaking will be an asset.
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