Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 24: Thermoelectric Materials

DS 24.8: Vortrag

Mittwoch, 13. März 2013, 16:30–16:45, H32

Acoustic phonon propagation in cobalt antimony skutterudites — •Chuan He¹, Martin Großmann¹, Martin Schubert¹, Marcus Daniel², Manfred Albrecht², and Thomas Dekorsy¹ — ¹University of Konstanz, Germany — ²Chemnitz University of Technology, Germany

Cobalt antimony skutterudites are interesting due to their promising thermoelectric properties. Filling foreign atoms in its cage-like structure is considered beneficial to their thermoelectric properties. The undoped CoSb3 samples and Co4Sb12 samples with different Yb concentration we studied are fabricated using molecular beam epitaxy and characterized by femtosecond pump and probe spectroscopy with an asynchronous optical sampling system. The transient reflectivity signal is strongly dependent on the Yb concentration. For highly doped samples fast electron-phonon coupling is observed.