Pan Y, Yao M, Hong X, Zhu Y, Fan F, Imasato K, He Y, Hess C, Fink J, Yang J, Buechner B, Fu C, Snyder GJ, Felser C (2020)
Publication Type: Journal article
Publication year: 2020
Book Volume: 13
Pages Range: 1717-1724
Journal Issue: 6
DOI: 10.1039/d0ee00838a
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.
APA:
Pan, Y., Yao, M., Hong, X., Zhu, Y., Fan, F., Imasato, K.,... 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
MLA:
Pan, Yu, et al. "Mg3(Bi,Sb)2single crystals towards high thermoelectric performance." Energy and Environmental Science 13.6 (2020): 1717-1724.
BibTeX: Download