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Metavalently bonded tellurides: the essence of improved thermoelectric performance in elemental Te

Author

Listed:
  • Decheng An

    (Taiyuan University of Technology)

  • Senhao Zhang

    (RWTH Aachen University)

  • Xin Zhai

    (Southeast University)

  • Wutao Yang

    (Taiyuan University of Technology)

  • Riga Wu

    (RWTH Aachen University)

  • Huaide Zhang

    (RWTH Aachen University)

  • Wenhao Fan

    (Taiyuan University of Technology)

  • Wenxian Wang

    (Taiyuan University of Technology)

  • Shaoping Chen

    (Taiyuan University of Technology)

  • Oana Cojocaru-Mirédin

    (Albert-Ludwigs-Universität Freiburg)

  • Xian-Ming Zhang

    (Taiyuan University of Technology
    Taiyuan University of Technology)

  • Matthias Wuttig

    (RWTH Aachen University
    Forschungszentrum Jülich)

  • Yuan Yu

    (RWTH Aachen University)

Abstract

Elemental Te is important for semiconductor applications including thermoelectric energy conversion. Introducing dopants such as As, Sb, and Bi has been proven critical for improving its thermoelectric performance. However, the remarkably low solubility of these elements in Te raises questions about the mechanism with which these dopants can improve the thermoelectric properties. Indeed, these dopants overwhelmingly form precipitates rather than dissolve in the Te lattice. To distinguish the role of doping and precipitation on the properties, we have developed a correlative method to locally determine the structure-property relationship for an individual matrix or precipitate. We reveal that the conspicuous enhancement of electrical conductivity and power factor of bulk Te stems from the dopant-induced metavalently bonded telluride precipitates. These precipitates form electrically beneficial interfaces with the Te matrix. A quantum-mechanical-derived map uncovers more candidates for advancing Te thermoelectrics. This unconventional doping scenario adds another recipe to the design options for thermoelectrics and opens interesting pathways for microstructure design.

Suggested Citation

  • Decheng An & Senhao Zhang & Xin Zhai & Wutao Yang & Riga Wu & Huaide Zhang & Wenhao Fan & Wenxian Wang & Shaoping Chen & Oana Cojocaru-Mirédin & Xian-Ming Zhang & Matthias Wuttig & Yuan Yu, 2024. "Metavalently bonded tellurides: the essence of improved thermoelectric performance in elemental Te," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47578-w
    DOI: 10.1038/s41467-024-47578-w
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