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Research paper | Open Access

Isovalent co-alloying contributes to considerable improvement in thermoelectric performance of BiSe bulks with weak anisotropy

Shenzhen Key Laboratory of Advanced Thin Films and Applications, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, China
Kunming University of Science and Technology, Kunming, 650093, China
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518060, Guangdong, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

BiSe with intrinsic low thermal conductivity has considered as a promising thermoelectric (TE) material at nearly room temperature. To improve its low thermoelectric figure of merit (zT), in this work, Sb and Te isovalent co-alloying was performed and significantly optimized its TE property with weakly anisotropic characteristic. After substituting Sb on Bi sites, the carrier concentration is suppressed by introduction of Sb- Se site defects, which contributes to the increased absolute value of Seebeck coefficient (|S|). Further co-alloying Te on Se of the optimized composition Bi0.7Sb0.3Se, the carrier concentration increased without affecting the |S| due to the enhanced effective mass, which leads to a highest power factor of 12.8 μW/(cm·K2) at 423 K. As a result, a maximum zT of ~0.54 is achieved for Bi0.7Sb0.3Se0.7Te0.3 along the pressing direction and the average zT (zTave) (from 300 K to 623 K) are drastically improved from 0.24 for pristine BiSe sample to 0.45. Moreover, an energy conversion efficiency ~4.0% is achieved for a single leg TE device of Bi0.7Sb0.3Se0.7Te0.3when applied the temperature difference of 339 K, indicating the potential TE application.

Keywords

BiSeIsovalent alloyingzTCarrier modulation

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Journal of Materiomics
Volume 10 Issue 5,
September 2024
Pages 965-974
DOI: 10.1016/j.jmat.2023.10.009
Cite this article:
Li F, Liu C, Nisar M, et al. Isovalent co-alloying contributes to considerable improvement in thermoelectric performance of BiSe bulks with weak anisotropy. Journal of Materiomics, 2024, 10(5): 965-974. https://doi.org/10.1016/j.jmat.2023.10.009

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Received: 07 September 2023
Revised: 17 October 2023
Accepted: 19 October 2023
Published: 08 November 2023
© 2023 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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