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Roles of Anion Sites in High-Performance GeTe Thermoelectrics

机译:Roles of Anion Sites in High-Performance GeTe Thermoelectrics

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摘要

Cationic doping is mainly used to improve the performance of rocksalt-structured GeTe thermoelectric materials. However, its counterpart anionic doping is scarcely facilitated. Here, a comprehensive discussion is provided on doping at the anion site of rocksalt-structured thermoelectric materials, surrounding its influence on bonding mechanisms, carrier and phonon transport characteristics, and thermoelectric figure-of-merit. To verify the viewpoint, a modified flux-assist method is adopted to synthesize anionic Iodine (Ⅰ) doped GeTe samples, which show comparably optimized electrical and thermal properties with that of cationic Antimony (Sb) or Bismuth (Bi) doped GeTe samples. Further combining cationic Bi and anionic I co-doping, an enhanced figure-of-merit from 0.8 in pristine GeTe to 2.5 at 675 K can be realized in 8 (Bi and I) co-doped GeTe, which corresponds to a maximum heat-toelectricity conversion efficiency of 14.6 under a temperature difference of 430 K. This study rationalizes the influence of anionic doping on the electrical and thermal properties of the rocksalt-structured materials, which serves as an effective yet previously neglected strategy toward high-performance GeTe thermoelectrics.

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  • 来源
    《Advanced functional materials》 |2022年第48期|2208579.1-2208579.8|共8页
  • 作者单位

    School of Mechanical and Mining Engineering The University of Queensland Brisbane, Queensland 4072, Australia,School of Chemistry and Physics Queensland University of Technology Brisbane, Queensland 4072, Australia;

    School of Mechanical and Mining Engineering The University of Queensland Brisbane, Queensland 4072, Australia;

    Centre for Future Materials University of Southern Queensland Springfield Central, Queensland 4300, AustraliaSchool of Chemistry and Physics Queensland University of Technology Brisbane, Queensland 4072, Australia,Centre for Future Materials University of Southern Queensland Springfield Central, Queensland 4300, AustraliaSchool of Mechanical and Mining Engineering The University of Queensland Brisbane, Queensland 4072, Australia,Centre for Microscopy and Microanalysis The University of Queensland Brisbane, Queensland 4072, AustraliaShenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016, P. R. China,Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055, P. R. ChinaSchool of Chemistry and Physics Queensland University of Technology Brisbane, Queensland 4072, Australia;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

    anionic dopants; conversion efficiencies; figure-of-merit; GeTe thermoelectrics;

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