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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (1): 103-110.DOI: 10.16553/j.cnki.issn1000-985x.2025.0154

• 研究论文 • 上一篇    下一篇

全无机钙钛矿铯锡溴的光学性质研究

梁永福1,2(), 杨豫萍1,2, 程学瑞1,2   

  1. 1.郑州轻工业大学电子信息学院,郑州 450002
    2.河南省信息功能材料与传感技术重点实验室,郑州 450002
  • 收稿日期:2025-07-20 出版日期:2026-01-20 发布日期:2026-02-05
  • 作者简介:梁永福(1991—),男,河南省人,博士,讲师。E-mail:liangyongfu@zzuli.edu.cn
  • 基金资助:
    国家自然科学基金青年基金(12104415);河南省科技攻关项目(252102241031)

Optical Properties of All-Inorganic Perovskite Cesium Tin Bromide

LIANG Yongfu1,2(), YANG Yuping1,2, CHENG Xuerui1,2   

  1. 1. School of Electronics and Information,Zhengzhou University of Light Industry,Zhengzhou 450002,China
    2. Henan Key Laboratory of Magnetoelectronic Information Functional Materials,Zhengzhou 450002,China
  • Received:2025-07-20 Online:2026-01-20 Published:2026-02-05

摘要: 安全环保的锡基钙钛矿材料以稳定、优异的性能正在成为无铅钙钛矿的替代品。本研究聚焦全无机锡基钙钛矿CsSnBr3的结构-性质关系,通过变温X射线衍射并结合Rietveld精修和热重分析研究了该材料的结构稳定性和在123~673 K的相变行为。CsSnBr3在298~673 K为Pm3ˉm相,在253 K转变成P4/mbm相,最后在123 K转变成Pnma相。紫外-可见吸收光谱与密度泛函计算共同表明该材料具有1.67 eV的直接带隙,其导带底由Sn-5p和Br-4p轨道构成,价带顶则源于Br-4p轨道。变温荧光光谱表明,CsSnBr3的荧光强度在113 K增强4倍。该现象可能源于低温下声子散射抑制,使非辐射复合降低。该研究为发展适用于高温条件的高效无铅钙钛矿太阳能电池提供了坚实的热力学基础。

关键词: 锡基钙钛矿; CsSnBr3; 荧光光谱; 光学性质; 活化能; 第一性原理

Abstract: Safe and environmentally friendly tin-based perovskite materials are emerging as promising lead-free alternatives due to their stable and excellent properties. This study focuses on the structure-property relationship of the all-inorganic tin-based perovskite CsSnBr3. The structural stability and phase transition behavior of this material over the temperature range from 123 K to 673 K were investigated using variable-temperature X-ray diffraction combined with Rietveld refinement and thermogravimetric analysis. CsSnBr3 exists as the Pm3ˉm phase between 298 K and 673 K, transforms into the P4/mbm phase at 253 K, and finally converts to the Pnma phase at 123 K. Ultraviolet-visible absorption spectroscopy and density functional theory calculations collectively reveal that the material possesses a direct band gap of 1.67 eV. The conduction band minimum is primarily constituted by Sn-5p and Br-4p orbitals, while the valence band maximum originates mainly from Br-4p orbitals. Temperature-dependent photoluminescence (PL) spectra indicate that the PL intensity of CsSnBr3 enhances fourfold at 113 K. This phenomenon is likely attributed to the suppression of phonon scattering at low temperatures, leading to reduced non-radiative recombination. This study provides a solid thermodynamic basis for the development of high-efficiency lead-free perovskite solar cells suitable for high-temperature conditions.

Key words: tin-based perovskite; CsSnBr3; PL spectroscopy; optical property; activation energy; first-principle

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