Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds
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d0ee03014g.pdf
Description
Published version
Size
4.53 MB
Format
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Checksum (MD5)
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Author(s)
He, Ran
Zhu, Taishan
Wang, Yumei
Wolff, Ulrike
Jaud, Jean-Christophe
Sotnikov, Andrei
Potapov, Pavel
Wolf, Daniel
Ying, Pingjun
Wood, Max
Date Issued
2020
Journal
Energy and Environmental Science
Publisher
Royal Society of Chemistry (RSC)
Citation
He, Ran, Zhu, Taishan, Wang, Yumei, Wolff, Ulrike, Jaud, Jean-Christophe et al. 2020. "Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds." Energy and Environmental Science, 13 (12).
Version
Final published version
Abstract
© The Royal Society of Chemistry. Half-Heusler (HH) compounds are among the most promising thermoelectric (TE) materials for large-scale applications due to their superior properties such as high power factor, excellent mechanical and thermal reliability, and non-toxicity. Their only drawback is the remaining-high lattice thermal conductivity. Various mechanisms were reported with claimed effectiveness to enhance the phonon scattering of HH compounds including grain-boundary scattering, phase separation, and electron-phonon interaction. In this work, however, we show that point-defect scattering has been the dominant mechanism for phonon scattering other than the intrinsic phonon-phonon interaction for ZrCoSb and possibly many other HH compounds. Induced by the charge-compensation effect, the formation of Co/4d Frenkel point defects is responsible for the drastic reduction of lattice thermal conductivity in ZrCoSb1-xSnx. Our work systematically depicts the phonon scattering profile of HH compounds and illuminates subsequent material optimizations. This journal is
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1039/D0EE03014G
