Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 24: Thermoelectric Materials
DS 24.6: Talk
Wednesday, March 13, 2013, 16:00–16:15, H32
Reduced thermal conductivity in Half Heusler superlattices — •Tino Jaeger1, Christoph Euler1, Christian Mix1, Michael Schwall2, Benjamin Balke2, Sascha Populoh3, Anke Weidenkaff3, Claudia Felser2, and Gerhard Jakob1 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, 55099 Mainz, Germany — 2Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, 55099 Mainz, Germany — 3Empa- Eidgenössische Materialprüfung und -forschungs Anstalt Festkörperchemie und Katalyse, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
Besides bulk applications that are well-established in industry, thin film technology moves into focus. Self-sustaining sensors and on-chip cooling represent the most emerging fields of application. As valid for the conventional techniques, enhancing ZT would open new prospects in commercial usage. For thin films, the fabrication of superlattices enables a unique type of nanostructuring. To sustain electronic behavior from layer to layer, subsequently deposited materials must have a structural similarity. XRD and transport measurements have shown that the Half-Heusler alloys TiNiSn and Zr0.5Hf0.5NiSn are appropriate in doing so. Increased cross-plane ZT in this material system is requested by additional interface scattering. Depressed thermal conductivity has been obtained by 3omega method. The measurement was performed by a home-made assembly using a passive circuit and a lock-in amplifier. We gratefully acknowledge financial support by DFG Ja821/4-1 with in the priority program SPP 1386.