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DS: Fachverband Dünne Schichten

DS 32: Thermoelectric materials I (Focused session – Organizers: Meyer, Heiliger)

DS 32.2: Hauptvortrag

Donnerstag, 29. März 2012, 10:00–10:30, H 2032

Oxide materials for high-temperature thermoelectrics — •Michitaka Ohtaki — Kyushu University, Fukuoka, Japan

Increasing energy demand in worldwide obviously requires more energy security options. Thermoelectric (TE) conversion is becoming more and more of vital importance for higher overall energy efficiency. However, conventional TE materials such as Bi2Te3 and PbTe based on Bi, Te, and Pb are unlikely to prevail for wide commercialization because of the toxicity, poor heat durability, and low abundance of the comprising elements, particularly for those containing Te. In terms of durability at high temperature in air, metal oxides are most attractive. Although strongly ionic characters and the light constituent element, oxygen, of metal oxides are obviously against the conventional guiding principles for higher ZT and hence metal oxides have been totally disregarded in the history of thermoelectrics until the early 1990s, several oxide materials such as CaMnO3, ZnO, SrTiO3, NaCoO2, and Ca3Co4O9 have been reported to actually show a promising thermoelectric performance [1,2]. In this paper, a landscape of oxide thermoelectric materials will be given with respect to the recent materials development based on analyses of the carrier mobility and the lattice thermal conductivity. Some strategies for selective phonon scattering for higher ZT in oxides will be given.

References [1] M. Ohtaki, K. Araki, K. Yamamoto, J. Electron. Mater., 38 1234 (2009). [2] N. V. Nong, N. Pryds, S. Linderoth, M. Ohtaki, Adv. Mater., 23, 2484 (2011).