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DS: Fachverband Dünne Schichten

DS 13: Thermoelectric Thin Films and Nanostructures I

DS 13.2: Vortrag

Dienstag, 23. März 2010, 10:45–11:00, H8

Experimental and theoretical investigations of PbTe-based nanocomposites with different inclusion phases — Denis Petri¹, Christoph Erk², Gert Homm³, Markus Piechotka³, Peter J. Klar³, Sabine Schlecht², and •Beate Paulus⁴ — ¹Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstraße 34-36, 14195 Berlin — ²Justus-Liebig-Universität Gießen, Institut für Anorganische und Analytische Chemie, Heinrich-Buff-Ring 58, 35392 Gießen — ³Justus-Liebig-Universitä t Gießen, I. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Gießen — ⁴Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin

Nanocomposite thermoelectric materials made by co-ball-milling of lead telluride and an added inclusion phase of Sb₂Te₃, BiSbTe₃, Bi₂Te₃ or AgSbTe₂ were investigated. A cold-pressing/annealing approach was applied to the resulting powders and the thermopower and the electrical conductivity of the products were measured in the temperature range of 50-300 K. The two quaternary phases Pb₁₀BiSbTe₁₃ (n-type) and Pb₁₀AgSbTe₁₂ (p-type) show the most promising power factors within the series of nanocomposites investigated. These experimental investigations are supported by first principle calculations for the bulk and the surfaces on the different materials.