Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)
HL 61.39: Poster
Wednesday, March 18, 2015, 15:00–20:00, Poster F
Transport Measurements on Thermoelectric CoSb3 and Partially-Filled YbxCo4Sb12 Skutterudites — •Martin Lonsky1, Sven Heinz1, Marcus Daniel2, Manfred Albrecht2,3, and Jens Müller1 — 1Physikalisches Institut, Goethe-Universität, Frankfurt (M), Germany — 2Institut für Physik, TU Chemnitz, Chemnitz, Germany — 3Institut für Physik, Universität Augsburg, Augsburg, Germany
Semiconducting CoSb3 is a member of the skutterudite family of compounds and a promising candidate for thermoelectric applications. Its thermoelectric properties can be improved by filling void space in its crystal structure with foreign atoms such as Yb or La. These loosely bound atoms serve as phonon-scattering centers and thereby reduce thermal conductivity drastically.
The aim of our study is a systematic investigation of the electronic transport properties for different filling factors on thin films of thermoelectric CoSb3 and partially filled YbxCo4Sb12 skutterudites. Transport parameters as resistivity ρ (T), effective charge carrier density n(T) and Hall mobility µ (T) have been determined in a broad temperature range from 20 to 250 K. In contrast to CoSb3, which is close to compensation of hole- and electron-like carriers, YbxCo4Sb12 clearly shows an n-type semiconductor behavior. Apart from resistance and Hall-effect measurements, we applied fluctuation (noise) spectroscopy in order to gain a deeper insight into the charge carrier dynamics of the investigated materials.