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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (4): 627-633.DOI: 10.16553/j.cnki.issn1000-985x.2025.0243

• 研究论文 • 上一篇    下一篇

硒化锑空穴迁移率的第一性原理研究

张冷1,2(), 黄佳健1, 申辉1, 吴孔平1   

  1. 1.金陵科技学院电子信息工程学院,南京 211169
    2.南京大学物理学院,固体微结构物理全国重点实验室,南京 210093
  • 收稿日期:2025-12-02 出版日期:2026-04-20 发布日期:2026-05-19
  • 作者简介:张冷(1990—),女,河南省人,博士,副教授。E-mail:zhangleng2018@jit.edu.cn
  • 基金资助:
    国家自然科学基金(61904071);2023年江苏省高校青蓝工程培养对象项目

First-Principles Study on Hole Mobility in Antimony Selenide

ZHANG Leng1,2(), HUANG Jiajian1, SHEN Hui1, WU Kongping1   

  1. 1.School of Electronics and Information Engineering,Jinling Institute of Technology,Nanjing 211169,China
    2.National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China
  • Received:2025-12-02 Online:2026-04-20 Published:2026-05-19

摘要: 硒化锑(Sb2Se3)以原料丰富、无毒、稳定等优势,成为一种前景广阔的薄膜光伏材料。尽管Sb2Se3光电转换效率已取得长足进步,但其背后的载流子输运机理,尤其是限制空穴迁移率的关键散射机制仍不清晰。针对此问题,本研究采用第一性原理密度泛函理论(DFT)结合玻尔兹曼输运理论,量化分析了声学形变势(ADP)散射、电离杂质(IMP)散射及极性光学声子(POP)散射对空穴迁移率的贡献,计算得到的室温空穴迁移率为42.8 cm2·V-1·s-1。研究发现,在105~650 K温度区间,极性光学声子散射是限制Sb2Se3空穴迁移率的主导机制;迁移率沿三个主要晶向(xyz)表现出明显的各向异性,y轴方向上迁移率最高,z轴方向上迁移率最低。同时发现:低载流子浓度下,空穴迁移率随着载流子浓度增加基本不变;高载流子浓度下,空穴迁移率随着载流子浓度增加而降低。该研究阐明了Sb2Se3空穴迁移率的影响因素,为其性能优化提供了一定理论依据。

关键词: 硒化锑; 太阳电池; 散射机制; 空穴迁移率; 第一性原理; 密度泛函理论; 玻尔兹曼输运理论

Abstract: Antimony selenide (Sb2Se3) is a promising photovoltaic thin-film material, owing to its abundant reserves, non-toxicity, and good stability. Despite substantial advances in its power conversion efficiency, the underlying carrier transport mechanism—particularly the key scattering processes that limit the hole mobility—remains unclear. To address this, first-principles density functional theory (DFT) combined with Boltzmann transport theory was used to quantitatively evaluate the contributions of acoustic deformation potential (ADP), ionized impurity (IMP), and polar optical phonon (POP) scattering to Sb2Se3 hole mobility. The calculated room-temperature hole mobility is 42.8 cm2·V-1·s-1. The results show that POP scattering dominated the limitation of hole mobility over a temperature range of 105~650 K. The mobility exhibits distinct anisotropy along the three principal crystallographic directions (xy and z), with the highest mobility in the y-axis direction and the lowest in the z-axis direction. It is also found that at low carrier concentrations, the hole mobility remains essentially unchanged as carrier concentration increases; at high carrier concentrations, the hole mobility decreases as carrier concentration increases. This work clarifies the dominant factors restricting the hole mobility of Sb2Se3 and offers a theoretical foundation for further performance optimization.

Key words: Sb2Se3; solar cell; scattering mechanism; hole mobility; first principle; density functional theory; Boltzmann transport theory

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