Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Transport

HL 25.1: Talk

Monday, March 14, 2011, 15:45–16:00, POT 151

Transport properties of BiTe-SbTe superlattices — •Bogdan Yavorsky¹, Nicki Hinsche¹, Peter Zahn¹, Martin Gradhand², Michael Czerner³, and Ingrid Mertig^1,2 — ¹Institut für Physik, Martin-Luther Universität Halle-Wittenberg, D-06120 Halle, Germany — ²Max-Plank-Institut für Mikrostrukturphysik, D-06099 Halle, Germany — ³I. Physikalisches Institut, AG Theorie, Justus-Liebig University Giessen, D-35392 Giessen, Germany

During the last decade BiTe-SbTe multilayers attracted much attention due to their enhanced thermoelectric figure of merit compared to the bulk materials. To shed light on the origin of this enhancement, we studied the electronic structure of (Bi₂Te₃)_x(Sb₂Te₃)_N−x superlattices with a fully relativistic screened Korringa-Kohn-Rostoker Green’s function method. The electrical conductivity was calculated within the relaxation time approximation of the Boltzmann theory. The effect of composition (x) on the transport near the Fermi energy and the consequences for the thermoelectric properties were studied in detail.