Dresden 2014 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 42: Thermoelectric Materials

DS 42.2: Vortrag

Donnerstag, 3. April 2014, 15:15–15:30, CHE 89

Thermoelectric properties of meso-porous thin films from laser-assisted wet-chemically doped group-IV nanoparticles — •Anton Greppmair¹, Benedikt Stoib¹, Tim Langmann¹, Nils Petermann², Hartmut Wiggers², Martin Stutzmann¹, and Martin S. Brandt¹ — ¹Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, 85748 Garching — ²Institut für Verbrennung und Gasdynamik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg

We present recent studies on the morphology and the thermoelectric properties of thin films of laser-sintered group-IV nanoparticles. The structure size of the meso-porous network can be controlled by the laser fluence used for sintering, doping is achieved by immersing the nanoparticle film in a liquid containing the dopants prior to sintering. Conductivity and thermopower measurements provide insight into the doping efficiency and confirm n- and p-type doping. For the doping with group-V elements we find a threshold concentration, above which the conductivity can be increased by several orders of magnitude using different dopant concentrations in the dopant solution. Adsorption of the dopant atoms to the nanoparticles is the limiting process for the doping efficiency. The doping process was successfully transferred to various SiGe alloy compositions ranging from pure Ge to pure Si. Thermal properties were also investigated by microscopic infrared thermography.

[1] B. Stoib et al., Physica Status Solidi A 210, 153 (2012)