|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
||Thin Film Heusler Systems: Boosting ZT
||Ernst Bauer, Bernhard Hinterleitner, Igor Knapp, Michael Poneder, Mathieu Taupin, Christoph Eisenmenger-Sittner, Christian Nöbauer
|On-Site Speaker (Planned)
Fe2VAl-based Heusler systems are promising thermoelectric materials for temperatures from 70 to 300°C due to their large power factor. Thin film samples of these alloys reduce the thermal conductivity in comparison with the bulk material, ZT values greater than 1 are expected. Throughout this work different mol fractions of iron and/or vanadium are exchanged by other metals to boost the ZT of the bulk material. The best compositions are then used for the thin film preparation via magnetron sputtering. As substrate undoped silicon was used. For better adherence it was sputter etched and heated to different temperatures during the sputtering process. The finished film is then heat treated to heal crystal defects.
For a single bulk sample, several thin films were made at different conditions. All these parameters influences thermoelectric properties. Under the best conditions the power factor increased by ten times with respect to the bulk material.
||Planned: Supplemental Proceedings volume