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Exceptional figure of merit achieved in boron-dispersed GeTe-based thermoelectric composites

Author

Listed:
  • Yilin Jiang

    (Tsinghua University)

  • Bin Su

    (Tsinghua University)

  • Jincheng Yu

    (Tsinghua University)

  • Zhanran Han

    (Tsinghua University)

  • Haihua Hu

    (Tsinghua University)

  • Hua-Lu Zhuang

    (Tsinghua University)

  • Hezhang Li

    (Tsinghua University
    Tsinghua University)

  • Jinfeng Dong

    (Tsinghua University
    Nanyang Technological University)

  • Jing-Wei Li

    (Tsinghua University)

  • Chao Wang

    (Tsinghua University)

  • Zhen-Hua Ge

    (Southwest United Graduate School)

  • Jing Feng

    (Southwest United Graduate School)

  • Fu-Hua Sun

    (Hubei Normal University)

  • Jing-Feng Li

    (Tsinghua University
    Southwest United Graduate School
    Hubei Normal University)

Abstract

GeTe is a promising p-type material with increasingly enhanced thermoelectric properties reported in recent years, demonstrating its superiority for mid-temperature applications. In this work, the thermoelectric performance of GeTe is improved by a facile composite approach. We find that incorporating a small amount of boron particles into the Bi-doped GeTe leads to significant enhancement in power factor and simultaneous reduction in thermal conductivity, through which the synergistic modulation of electrical and thermal transport properties is realized. The thermal mismatch between the boron particles and the matrix induces high-density dislocations that effectively scatter the mid-frequency phonons, accounting for a minimum lattice thermal conductivity of 0.43 Wm−1K−1 at 613 K. Furthermore, the presence of boron/GeTe interfaces modifies the interfacial potential barriers, resulting in increased Seebeck coefficient and hence enhanced power factor (25.4 μWcm−1K−2 at 300 K). Consequently, we obtain a maximum figure of merit Zmax of 4.0 × 10−3 K−1 at 613 K in the GeTe-based composites, which is the record-high value in GeTe-based thermoelectric materials and also superior to most of thermoelectric systems for mid-temperature applications. This work provides an effective way to further enhance the performance of GeTe-based thermoelectrics.

Suggested Citation

  • Yilin Jiang & Bin Su & Jincheng Yu & Zhanran Han & Haihua Hu & Hua-Lu Zhuang & Hezhang Li & Jinfeng Dong & Jing-Wei Li & Chao Wang & Zhen-Hua Ge & Jing Feng & Fu-Hua Sun & Jing-Feng Li, 2024. "Exceptional figure of merit achieved in boron-dispersed GeTe-based thermoelectric composites," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50175-6
    DOI: 10.1038/s41467-024-50175-6
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    References listed on IDEAS

    as
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