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<p>Thermoelectric materials possess tremendous potential in energy regeneration owing to their capacity to produce power directly from heat. SnTe, a lead-free compound, is a prospective thermoelectric material. However, because of its elevated thermal conductivity, the thermoelectric performance of undoped SnTe remains at a low level. In this work, we induce ternary compounds CuFeS<sub>2</sub> into the SnTe matrix by ball milling. We observe the decomposition of CuFeS<sub>2</sub>, which decomposes into FeS, Cu<sub>2</sub>S, and other binary compounds. These newly generated binary compounds form micropores and secondary phases in the matrix. Combined with the natural grain boundaries in the polycrystal, they form all-scale hierarchical structures within the material, resulting in reduced lattice thermal conductivity. Overall, the produced SnTe + 2&#xa0;wt%&#xa0;CuFeS<sub>2</sub> composites show the peak dimensionless figure of merit (<i>ZT</i>) up to 0.33 at 673&#xa0;K, an increase of ~ 100% compared to the undoped SnTe.</p>

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Impact of CuFeS2 on the Thermoelectric Performance of SnTe

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Baocheng Yuan,
  • Yi Wen,
  • Lei Wang,
  • Zhihao Li,
  • Hong-Chao Wang,
  • Cheng Chang,
  • Li-Dong Zhao

摘要

Thermoelectric materials possess tremendous potential in energy regeneration owing to their capacity to produce power directly from heat. SnTe, a lead-free compound, is a prospective thermoelectric material. However, because of its elevated thermal conductivity, the thermoelectric performance of undoped SnTe remains at a low level. In this work, we induce ternary compounds CuFeS2 into the SnTe matrix by ball milling. We observe the decomposition of CuFeS2, which decomposes into FeS, Cu2S, and other binary compounds. These newly generated binary compounds form micropores and secondary phases in the matrix. Combined with the natural grain boundaries in the polycrystal, they form all-scale hierarchical structures within the material, resulting in reduced lattice thermal conductivity. Overall, the produced SnTe + 2 wt% CuFeS2 composites show the peak dimensionless figure of merit (ZT) up to 0.33 at 673 K, an increase of ~ 100% compared to the undoped SnTe.