- Ge Mn based nanostructured thin films : phonon glass - electron crystal material for thermoelectricity applications

Top view TEM image of nanostructured GeMn thin film

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.

 

Cross view TEM image of nanostructured GeMn on GOI (germanium on insulator)

Permanent Staff:

André BARSKi

 

Non-permanent Staff:

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)

 

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