New porous materials in the form of nanofibers
Offer N°: SL-DRT-14-0572
Discovered in the early 1900's, electrospinning is a long-known polymer processing technique that has recently been rediscovered. It allows for the creation of nanofibers (fibers with a diameter well in the realm of nano dimensions) that can be collected to form a non-woven fabric. The resulting material can be applied to create many products including medical devices, tissue engineering scaffolds, clothing and filtration media.
Modular Emission Tomography System based on CdZnTe detectors
Offer N°: SL-DRT-14-0586
The Detector laboratory is developing semiconductor radiation detector based systems for medical imaging (radiology, X-CT, SPECT) and safety applications (baggage inspection, nuclear safety). It has been shown that the improvement of signal processing techniques allows to extract for each detected photon several physical parameters: energy, 3D positioning and timestamp.
Study of assembly technologies for high temperature power components
Offer N°: SL-DRT-14-0568
This thesis is integrated in LETI's developments of power transistors, based on gallium nitride material. This wide-bandgap semiconductor allows increased performances of energy converters in terms of efficiency and power density. Compared to silicon components, it permits to work at higher frequencies and temperatures (over 200°C). However, such characteristics imply specific packaging technologies, that are not available in current package technologies developed for silicon transistors.
Study of extrinsic doping in high operating temperature (HOT) HgCdTe photodetectors
Offer N°: SL-DRT-14-0752
CEA/Leti is, in collaboration with the Grenoble based company Sofradir, one of the world leaders in the research and development of Infrared photodetectors made in the II-VI semi-conductor HgCdTe. One of the main challenges in this field is the increase in operating temperature of the detectors. Theoretically, the highest operating temperature in HgCdTe photodiodes should be achieved in extrinsically doped material.