|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications X
||The Wurtzite CuFeS2 Thin Film and Its Phase Transformation to Chalcopyrite for Thermoelectric Generator
||Hong Pang, Cédric Bourgès, Naohito Tsujii, Takahiro Baba, Naoki Sato, Tetsuya Baba, Takao Mori
|On-Site Speaker (Planned)
Utilizing magnetic semiconductors to obtain enhanced thermoelectric (TE) performance has been demonstrated in the cases where the electrical carriers have strong interaction with the magnetic moments. Thin film offers tremendous scope for TE materials by eliminating the scattering of carriers and minimization of thermal conductivity. Herein this work, the prototypical magnetic semiconductor chalcopyrite, CuFeS2-type thin films was targeted. The non-equilibrium condition in the radio frequency magnetron sputtering provides the possibility to form the elusive metastable compound from ambient environment. A novel metastable wurtzite CuFeS2 thin film was fabricated via co-sputtering deposition and disclosed with a promising thermoelectric harvesting capability. Further investigation reveals that Zn doping and high temperature stage can activate the phase transformation from metastable wurtzite structure to the thermodynamically stable chalcopyrite phase. A power factor of ~0.17 mW·m-1·K-2 at room temperature has been obtained so far, and other TE properties are investigated.
||Thin Films and Interfaces, Phase Transformations, Energy Conversion and Storage