中国物理B ›› 2024, Vol. 33 ›› Issue (4): 47301-047301.doi: 10.1088/1674-1056/ad11e5

所属专题: SPECIAL TOPIC — Heat conduction and its related interdisciplinary areas

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Diameter-dependent ultra-high thermoelectric performance of ZnO nanowires

Yinan Nie(聂祎楠), Guihua Tang(唐桂华), Yifei Li(李一斐), Min Zhang(张敏), and Xin Zhao(赵欣)   

  1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2023-10-05 修回日期:2023-11-20 接受日期:2023-12-04 出版日期:2024-03-19 发布日期:2024-04-07
  • 通讯作者: Guihua Tang E-mail:ghtang@mail.xjtu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 52130604 and 51825604).

Diameter-dependent ultra-high thermoelectric performance of ZnO nanowires

Yinan Nie(聂祎楠), Guihua Tang(唐桂华), Yifei Li(李一斐), Min Zhang(张敏), and Xin Zhao(赵欣)   

  1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2023-10-05 Revised:2023-11-20 Accepted:2023-12-04 Online:2024-03-19 Published:2024-04-07
  • Contact: Guihua Tang E-mail:ghtang@mail.xjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 52130604 and 51825604).

摘要: Zinc oxide (ZnO) shows great potential in electronics, but its large intrinsic thermal conductivity limits its thermoelectric applications. In this work, we explore the significant carrier transport capacity and diameter-dependent thermoelectric characteristics of wurtzite-ZnO<0001> nanowires based on first-principles and molecular dynamics simulations. Under the synergistic effect of band degeneracy and weak phonon—electron scattering, P-type (ZnO)73 nanowires achieve an ultra-high power factor above 1500 μW· cm-1· K-2 over a wide temperature range. The lattice thermal conductivity and carrier transport properties of ZnO nanowires exhibit a strong diameter size dependence. When the ZnO nanowire diameter exceeds 12.72 Å, the carrier transport properties increase significantly, while the thermal conductivity shows a slight increase with the diameter size, resulting in a ZT value of up to 6.4 at 700 K for P-type (ZnO)73. For the first time, the size effect is also illustrated by introducing two geometrical configurations of the ZnO nanowires. This work theoretically depicts the size optimization strategy for the thermoelectric conversion of ZnO nanowires.

关键词: ZnO nanowire, size effect, thermoelectric performance, deformation potential theory

Abstract: Zinc oxide (ZnO) shows great potential in electronics, but its large intrinsic thermal conductivity limits its thermoelectric applications. In this work, we explore the significant carrier transport capacity and diameter-dependent thermoelectric characteristics of wurtzite-ZnO<0001> nanowires based on first-principles and molecular dynamics simulations. Under the synergistic effect of band degeneracy and weak phonon—electron scattering, P-type (ZnO)73 nanowires achieve an ultra-high power factor above 1500 μW· cm-1· K-2 over a wide temperature range. The lattice thermal conductivity and carrier transport properties of ZnO nanowires exhibit a strong diameter size dependence. When the ZnO nanowire diameter exceeds 12.72 Å, the carrier transport properties increase significantly, while the thermal conductivity shows a slight increase with the diameter size, resulting in a ZT value of up to 6.4 at 700 K for P-type (ZnO)73. For the first time, the size effect is also illustrated by introducing two geometrical configurations of the ZnO nanowires. This work theoretically depicts the size optimization strategy for the thermoelectric conversion of ZnO nanowires.

Key words: ZnO nanowire, size effect, thermoelectric performance, deformation potential theory

中图分类号:  (Electronic transport in nanoscale materials and structures)

  • 73.63.-b
73.50.Lw (Thermoelectric effects)