Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 13: Thermoelectric Thin Films and Nanostructures I
DS 13.1: Talk
Tuesday, March 23, 2010, 10:30–10:45, H8
Thermoelectric investigations on nanocomposite PbTe with different inclusions — •Gert Homm1, Denis Petri3, Sabine Schlecht2, and Peter J. Klar1 — 1I. Physikalisches Institut, Justus-Liebig-Universität, Gießen, Germany — 2Institut für Anorganische und Analytische Chemie, Justus-Liebig-Universität, Gießen, Germany — 3Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
We investigated different series of nanogranular so called LAST (LeadAntimonySilverTelluride) samples where either the composition of the inclusion of particles was varied or the PbTe matrix itself was doped isovalently by different elements. Inclusion particles of BiSbTe3, AgSbBiTe2 and AgSbTe2, respectively, were distributed into a nanoparticulate matrix of PbTe by co-ball-milling of the two components and compacting/annealing of the resulting composite material. This is a very easy and economic way of nanostructuring. The resulting nanogranularity of the material is supposed to exhibit a lower thermal conductivity than the corresponding bulk material but possess comparable electrical conductivity. The thermopower and the electrical conductivity was measured in the range of 50-300 K before and after annealing of the specimens. The changes of the thermoelectric properties due to doping of the PbTe matrix as well as of the nanograins will be discussed. The effects of the annealing with respect to structural changes as well as dopant diffusion will be explained. (SPP 1386)