Dresden 2011 – scientific programme
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DS: Fachverband Dünne Schichten
DS 43: Poster II: Thin Film Chalcogenide Photovoltaics; Thermoelectric Materials, Thin Films, and Nanostructures
DS 43.4: Poster
Wednesday, March 16, 2011, 15:00–17:30, P2
Thermal conduction in correlated multilayer structures — •Stefanie Wiedigen1, Kodanda R. Mangipudi1, Manuel Feuchter2, Christian Jooss1, Cynthia A. Volkert1, and Marc Kamlah2 — 1Institut für Materialphysik, Georg-August-Universität Göttingen, Germany — 2Institut for Materials Research II, Karlsruhe Institute of Technology, Germany
High-efficient thermoelectric devices require effective methods of suppressing thermal conductivity, e.g. by complex materials, multilayer structures or nanoscale patterning to enhance the figure of merit Z. The goal of this collaborative work is to understand the anisotropic and size dependent thermal conductivity in multilayer structures. Because of correlation effects, e.g. perovskite oxides are promising new thermoelectric materials. Thin films of these materials are measured with the 3ω method which is a common and reliable measurement technique for thin film and multilayer thermal conductivity. However, measuring complex geometries requires an extension of the standard method. Improvement of the experimental setup is related to new heater concepts and patterned layer configurations. This needs support by finite element simulations with respect to the detailed thermal and electric conditions due to lack of analytical solutions. Another important requirement is the selection of multilayer materials and their geometry. We study phonon dispersion in a two component singly-periodic infinite multilayer system using continuum finite element models. The results will be presented in terms of the effect of the elastic constants and thickness on the phonon band gap variation.