High thermoelectric efficiency realized in SnSe crystals via structural modulation

Bingchao Qin, Dongyang Wang, Tao Hong, Yuping Wang, Dongrui Liu, Ziyuan Wang, Xiang Gao, Zhen-Hua Ge and Li-Dong Zhao ()
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Bingchao Qin: Beihang University
Dongyang Wang: Zhengzhou University
Tao Hong: Beihang University
Yuping Wang: Beihang University
Dongrui Liu: Beihang University
Ziyuan Wang: Kunming University of Science and Technology
Xiang Gao: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Zhen-Hua Ge: Kunming University of Science and Technology
Li-Dong Zhao: Beihang University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Crystalline thermoelectrics have been developed to be potential candidates for power generation and electronic cooling, among which SnSe crystals are becoming the most representative. Herein, we realize high-performance SnSe crystals with promising efficiency through a structural modulation strategy. By alloying strontium at Sn sites, we modify the crystal structure and facilitate the multiband synglisis in p-type SnSe, favoring the optimization of interactive parameters μ and m*. Resultantly, we obtain a significantly enhanced PF ~85 μW cm−1 K−2, with an ultrahigh ZT ~1.4 at 300 K and ZTave ~2.0 among 300–673 K. Moreover, the excellent properties lead to single-leg device efficiency of ~8.9% under a temperature difference ΔT ~300 K, showing superiority among the current low- to mid-temperature thermoelectrics, with an enhanced cooling ΔTmax of ~50.4 K in the 7-pair thermoelectric device. Our study further advances p-type SnSe crystals for practical waste heat recovery and electronic cooling.

Date: 2023
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DOI: 10.1038/s41467-023-37114-7

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