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High thermoelectric efficiency realized in SnSe crystals via structural modulation

Author

Listed:
  • 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)

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.

Suggested Citation

  • Bingchao Qin & Dongyang Wang & Tao Hong & Yuping Wang & Dongrui Liu & Ziyuan Wang & Xiang Gao & Zhen-Hua Ge & Li-Dong Zhao, 2023. "High thermoelectric efficiency realized in SnSe crystals via structural modulation," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37114-7
    DOI: 10.1038/s41467-023-37114-7
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