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Constantly yielding important breakthroughs, epitaxy research is an extremely dynamic field. Epitaxy involves developing techniques to produce high-quality monocrystalline films with specific properties. Accurately controlling film growth, doping, and heterostructure formation has turned the method into a crucial component for the semi-conductor industry, enhancing the performance, scalability, and integration of semi-conductors.
Having devoted their thesis to this topic, Justine and Marvin received awards for their innovations.
Justine studied the epitaxial growth of IV-IV semi-conductor materials such as Silicium-Germanium (SiGe) or doped silicon. Her research involved determining the growth characteristics and incorporation of dopants, which revealed potential applications for devices and made it possible to grasp their properties in a different light. Her next goal is to integrate this process into a device as a way of improving its energy efficiency. Attending conferences remotely rather than flying, Justine takes sustainable development issues to heart both in her everyday life and in epitaxy.
The CEA-Leti ecosystem is very rich; it's impossible not to expand my field of knowledge. Additionally, research is focusing more on environmental responsibility. This has a real impact on my professional and personal decisions."
Marvin rose to the challenge of co-integrating innovative materials with standardized industry equipment by using the RP-CVD (Reduced Pressure-Chemical Vapor Deposition) process. A contact resistance reduced via strong doping levels and an improved electrical confinement were used to manufacture photodiodes on Silicon Germanium Tin (SiGeSn). They demonstrated improved light-emitting intensity when integrated in photonic devices compared with photodiodes that had doped Germanium (Ge) contact layers. The wavelength range covered by the photodiodes is promising for their use as CMOS-compatible components, including to detect gases inexpensively. Having developed an optical laser device that works at room temperature, Marvin's next goal is to design a laser that will work electrically under the same conditions.
Marvin's paper : click here
Justine's paper : click here
Acknowledgements: Jean-Michel Hartmann, Fabien Deprat, Pablo Acosta Alba, Cecile Moulin, Sylvain Maitrejean, Dan Buca, Vincent Reboud, Lara Casiez, Clément Cardoux, Nicolas PAUC, Vincent Calvo, Alexei Tchelnokov
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.