Thanks to thermoelectric materials, we can recycle waste-heat to transform it back into electric power. This opens a wide range of applications, allowing a more efficient use of energy resources, and to face the new environmental issues. Here we investigate thermoelectric properties of nanostructured (Ge,Mn) thin films grown by molecular beam epitaxy (MBE) and annealed at high temperature. Our objective is to optimize the growth parameters in order to maximize the thermoelectric figure of merit ZT. This could be done by reducing the thermal conductivity, keeping high the Seebeck coefficient and the electrical conductivity of Ge matrix. To achieve this objective, we introduce phonons scattering centers (Ge,Mn) clusters. In this work, we investigate structural and chemical properties of (Ge,Mn) clusters using HRTEM and STEM-EELS observations.
2013 – 2016: Mustapha BOUKHARI, PhD Student
2012 – 2013: Dimitri TAÏNOFF, Post-doc
Other years (PhD students) : Abhinav JAIN, Thibaut DEVILLERS, Clément PORRET, Romain Dujardin
Maj : 19/10/2016 (1193)