Realizing high-ranged thermoelectric performance in PbSnS2 crystals

Shaoping Zhan, Tao Hong, Bingchao Qin, Yingcai Zhu, Xiang Feng, Lizhong Su, Haonan Shi, Hao Liang, Qianfan Zhang, Xiang Gao, Zhen-Hua Ge, Lei Zheng, Dongyang Wang () and Li-Dong Zhao ()
Additional contact information
Shaoping Zhan: Beihang University
Tao Hong: Beihang University
Bingchao Qin: Beihang University
Yingcai Zhu: Beihang University
Xiang Feng: Beihang University
Lizhong Su: Beihang University
Haonan Shi: Beihang University
Hao Liang: Kunming University of Science and Technology
Qianfan Zhang: Beihang University
Xiang Gao: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Zhen-Hua Ge: Kunming University of Science and Technology
Lei Zheng: Beihang University
Dongyang Wang: Zhengzhou University
Li-Dong Zhao: Beihang University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Great progress has been achieved in p-type SnS thermoelectric compound recently, while the stagnation of the n-type counterpart hinders the construction of thermoelectric devices. Herein, n-type sulfide PbSnS2 with isostructural to SnS is obtained through Pb alloying and achieves a maximum ZT of ~1.2 and an average ZT of ~0.75 within 300–773 K, which originates from enhanced power factor and intrinsically ultralow thermal conductivity. Combining the optimized carrier concentration by Cl doping and enlarged Seebeck coefficient through activating multiple conduction bands evolutions with temperature, favorable power factors are maintained. Besides, the electron doping stabilizes the phase of PbSnS2 and the complex-crystal-structure induced strong anharmonicity results in ultralow lattice thermal conductivity. Moreover, a maximum power generation efficiency of ~2.7% can be acquired in a single-leg device. Our study develops a n-type sulfide PbSnS2 with high performance, which is a potential candidate to match the excellent p-type SnS.

Date: 2022
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DOI: 10.1038/s41467-022-33684-0

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