Wide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values

Jing-Wei Li, Zhijia Han, Jincheng Yu, Hua-Lu Zhuang (), Haihua Hu, Bin Su, Hezhang Li, Yilin Jiang, Lu Chen, Weishu Liu, Qiang Zheng and Jing-Feng Li ()
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Jing-Wei Li: Tsinghua University
Zhijia Han: Southern University of Science and Technology
Jincheng Yu: Tsinghua University
Hua-Lu Zhuang: Tsinghua University
Haihua Hu: Tsinghua University
Bin Su: Tsinghua University
Hezhang Li: Tsinghua University
Yilin Jiang: Tsinghua University
Lu Chen: Tsinghua University
Weishu Liu: Southern University of Science and Technology
Qiang Zheng: National Centre for Nanoscience and Technology
Jing-Feng Li: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Mg3(Sb,Bi)2 is a promising thermoelectric material suited for electronic cooling, but there is still room to optimize its low-temperature performance. This work realizes >200% enhancement in room-temperature zT by incorporating metallic inclusions (Nb or Ta) into the Mg3(Sb,Bi)2-based matrix. The electrical conductivity is boosted in the range of 300–450 K, whereas the corresponding Seebeck coefficients remain unchanged, leading to an exceptionally high room-temperature power factor >30 μW cm−1 K−2; such an unusual effect originates mainly from the modified interfacial barriers. The reduced interfacial barriers are conducive to carrier transport at low and high temperatures. Furthermore, benefiting from the reduced lattice thermal conductivity, a record-high average zT > 1.5 and a maximum zT of 2.04 at 798 K are achieved, resulting in a high thermoelectric conversion efficiency of 15%. This work demonstrates an efficient nanocomposite strategy to enhance the wide-temperature-range thermoelectric performance of n-type Mg3(Sb,Bi)2, broadening their potential for practical applications.

Date: 2023
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DOI: 10.1038/s41467-023-43228-9

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