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<p>Thermoelectric (TE) technology offers a sustainable solution that improves energy efficiency by converting waste heat into electrical energy. Among various thermoelectric materials, ZnSb has attracted attention due to its stable operation in the medium temperature range, its abundance, and its low cost. However, its simple crystal structure results in high thermal conductivity, which limits its thermoelectric performance. In this study, we doped Fe at the Zn sites to improve the electrical and thermal transport properties of ZnSb and analyzed the effects of Fe substitution. Fe<sub>y</sub>Zn<sub>1-y</sub>Sb (y = 0, 0.001, 0.002, 0.004, and 0.006) compounds were synthesized via a melting-quenching-annealing process, and thermoelectric performance was evaluated according to Fe content. Low Fe doping significantly reduced lattice thermal conductivity by maximizing phonon scattering without significantly degrading electrical properties. The Fe<sub>0.002</sub>Zn<sub>0.998</sub>Sb sample exhibited an improved <i>zT</i> value of ~ 0.613 at 723&#xa0;K, a 21% improvement over the ~ 0.507 value of pure ZnSb. These results provide new insights into the enhancement of ZnSb thermoelectric properties through Fe doping and will contribute to the development of efficient and sustainable thermoelectric materials.</p>

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Enhanced thermoelectric performance of ZnSb through Fe doping-induced phonon scattering

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Jeong Min Lee,
  • Seung Bin Park,
  • Sung Hyun Kang,
  • Yong-Jae Jung,
  • Minsu Heo,
  • Jong-Min Oh,
  • Sang-Mo Koo,
  • Woo Hyun Nam,
  • Jung Young Cho,
  • Hyun-Sik Kim,
  • Jinsung Choi,
  • Eun Ha Choi,
  • Weon Ho Shin

摘要

Thermoelectric (TE) technology offers a sustainable solution that improves energy efficiency by converting waste heat into electrical energy. Among various thermoelectric materials, ZnSb has attracted attention due to its stable operation in the medium temperature range, its abundance, and its low cost. However, its simple crystal structure results in high thermal conductivity, which limits its thermoelectric performance. In this study, we doped Fe at the Zn sites to improve the electrical and thermal transport properties of ZnSb and analyzed the effects of Fe substitution. FeyZn1-ySb (y = 0, 0.001, 0.002, 0.004, and 0.006) compounds were synthesized via a melting-quenching-annealing process, and thermoelectric performance was evaluated according to Fe content. Low Fe doping significantly reduced lattice thermal conductivity by maximizing phonon scattering without significantly degrading electrical properties. The Fe0.002Zn0.998Sb sample exhibited an improved zT value of ~ 0.613 at 723 K, a 21% improvement over the ~ 0.507 value of pure ZnSb. These results provide new insights into the enhancement of ZnSb thermoelectric properties through Fe doping and will contribute to the development of efficient and sustainable thermoelectric materials.