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DS: Fachverband Dünne Schichten

DS 16: Poster I

DS 16.32: Poster

Dienstag, 24. März 2009, 09:30–12:30, P5

Heusler thin film superlattices as model systems for thermoelectric materials — •Gerhard Jakob¹, Tobias Eichhorn¹, Joachim Barth², Gerhard Fecher², Claudia Felser², and Anke Weidenkaff³ — ¹Institute of Physics, Johannes Gutenberg-University, 55099 Mainz, Germany — ²Institute of Anorganic and Analytical Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany — ³Empa - Swiss Federal Laboratories for Materials Testing and Research, 8600 Duebendorf, Switzerland

Research on thermoelectric materials has strongly increased in recent years due to their high application potential. We use Heusler type materials of C1b structure as model system for thermoelectric materials. TiNiSn is known to possess a high thermoelectric power factor and we show data of epitaxial film growth and the resistive and thermoelectric transport properties of these films. We do band structure calculations in order to find suitable partner systems with a similar Fermi surface but a different phonon structure. Free standing films are achieved using deposition on solvable substrates. Using a multilayer deposition system we prepare Heusler type superlattices with the aim to reduce thermal conductivity while keeping electrical conductivity high.