Mg3(Bi,Sb)2single crystals towards high thermoelectric performance

Yu Pan, Mengyu Yao, Xiaochen Hong, Yifan Zhu, Yifan Zhu, Fengren Fan, Kazuki Imasato, Yangkun He, Christian Hess, Jörg Fink, Jörg Fink, Jörg Fink, Jiong Yang, Bernd Büchner, Bernd Büchner, Chenguang Fu*, G. Jeffrey Snyder, Claudia Felser

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The rapid growth of the thermoelectric cooler market makes the development of novel room temperature thermoelectric materials of great importance. Ternary n-type Mg3(Bi,Sb)2 alloys are promising alternatives to the state-of-the-art Bi2(Te,Se)3 alloys but grain boundary resistance is the most important limitation. n-type Mg3(Bi,Sb)2 single crystals with negligible grain boundaries are expected to have particularly high zT but have rarely been realized due to the demanding Mg-rich growth conditions required. Here, we report, for the first time, the thermoelectric properties of n-type Mg3(Bi,Sb)2 alloyed single crystals grown by a one-step Mg-flux method using sealed tantalum tubes. High weighted mobility ∼140 cm2 V-1 s-1 and a high zT of 0.82 at 315 K are achieved in Y-doped Mg3Bi1.25Sb0.75 single crystals. Through both experimental angle-resolved photoemission spectroscopy and theoretical calculations, we denote the origin of the high thermoelectric performance from a point of view of band widening effect and electronegativity, as well as the necessity to form high Bi/Sb ratio ternary Mg3(Bi,Sb)2 alloys. The present work paves the way for further development of Mg3(Bi,Sb)2 for near room temperature thermoelectric applications.

Original languageEnglish (US)
Pages (from-to)1717-1724
Number of pages8
JournalEnergy and Environmental Science
Volume13
Issue number6
DOIs
StatePublished - Jun 2020

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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    Pan, Y., Yao, M., Hong, X., Zhu, Y., Zhu, Y., Fan, F., Imasato, K., He, Y., Hess, C., Fink, J., Fink, J., Fink, J., Yang, J., Büchner, B., Büchner, B., Fu, C., Snyder, G. J., & Felser, C. (2020). Mg3(Bi,Sb)2single crystals towards high thermoelectric performance. Energy and Environmental Science, 13(6), 1717-1724. https://doi.org/10.1039/d0ee00838a