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<p>Tin selenide (SnSe), a prominent narrow-bandgap p-type semiconductor in the IV-VI group, has garnered significant research interest due to its exceptionally low thermal conductivity and remarkable thermoelectric performance. This study systematically investigates the synergistic effects of zinc oxide (ZnO) particle size variation (30 nm, 200 nm, and 45 μm) and composite ratios on the thermoelectric transport properties of SnSe matrix composites fabricated through hydrothermal synthesis at 140°C with a 14 h reaction time. Experimental results demonstrate that the incorporation of 45 μm ZnO particles at an optimal 2% mass ratio substantially enhances the thermoelectric performance of ZnO/SnSe composites, achieving a peak thermoelectric figure of merit (<i>ZT</i>) value of approximately 1.5 ± 0.1 at 773 K, with an average <i>ZT</i> of 0.9 across 373–773 K. This significant improvement highlights the critical role of secondary phase particle size optimization in developing high-efficiency thermoelectric materials.</p>

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ZnO particle size engineering in SnSe composites: synergistic optimization of thermoelectric performance

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Xinjuan Yang,
  • Yunkai Li,
  • Xiaolong Li,
  • Lige Wang,
  • Jing Liu

摘要

Tin selenide (SnSe), a prominent narrow-bandgap p-type semiconductor in the IV-VI group, has garnered significant research interest due to its exceptionally low thermal conductivity and remarkable thermoelectric performance. This study systematically investigates the synergistic effects of zinc oxide (ZnO) particle size variation (30 nm, 200 nm, and 45 μm) and composite ratios on the thermoelectric transport properties of SnSe matrix composites fabricated through hydrothermal synthesis at 140°C with a 14 h reaction time. Experimental results demonstrate that the incorporation of 45 μm ZnO particles at an optimal 2% mass ratio substantially enhances the thermoelectric performance of ZnO/SnSe composites, achieving a peak thermoelectric figure of merit (ZT) value of approximately 1.5 ± 0.1 at 773 K, with an average ZT of 0.9 across 373–773 K. This significant improvement highlights the critical role of secondary phase particle size optimization in developing high-efficiency thermoelectric materials.