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DS: Fachverband Dünne Schichten

DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers

DS 9.53: Poster

Montag, 22. März 2010, 15:00–17:30, Poster D1

Complex Chalcogenides for Thermoelectrics: Microstructural-Property Relationship — •Susanne Perlt and Thomas Höche — Leibniz Institute of Surface Modification, Permoserstrasse 15, D-04318 Leipzig, Germany

The quaternary compound AgPb₁₈SbTe₂₀ (LAST) is a typical high-temperature thermoelectric material. The manufactoring process needs to be controlled in such a way, that the figure of merit, ZT [1], gets maximized. In this respect, a high electronic conductivity σ, a high thermopower S, and a low thermal conductivity κ are crucial. The high thermoelectric performance of LAST is assumed to be caused by the nanoscale precipitates formed by spinodal decomposition [2].
Based on properties monitored by a Seebeck probe, structure-property relationships are studied by SEM and TEM analysis. Site-specific lift-out of TEM lamellae from thermoelectrically characterised samples is made by focused ion beam (FIB) machining. Composition analyses, phase analyses (via electron diffraction) and element distributions are done by energy-dispersive X-ray spectrometry.
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M.-K. Han et al., Chem. Mater. 20, 3512 (2008)