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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (7): 1282-1288.DOI: 10.16553/j.cnki.issn1000-985x.2025.0080

• 研究论文 • 上一篇    下一篇

I-掺杂Cs3Bi2Br9晶体的生长及其光学性能调控

陈思贤(), 徐乐, 唐远之, 孙海滨, 郭学, 冯玉润, 胡强强()   

  1. 山东理工大学材料科学与工程学院,淄博 255049
  • 收稿日期:2025-04-15 出版日期:2025-07-20 发布日期:2025-07-30
  • 通信作者: 胡强强,博士,教授。E-mail:huqq@sdut.edu.cn
  • 作者简介:陈思贤(2000—),男,广东省人,硕士研究生。E-mail:1837701211@qq.com
    胡强强,工学博士,山东理工大学材料科学与工程学院教授。主要从事具有重要应用前景的光电功能晶体的生长及应用研究。入选山东省“青年优秀人才引进计划”,担任山东省高等学校青创团队负责人、山东理工大学晶体材料研究所负责人。主持教育部联合基金、国家自然科学基金、山东省自然科学基金等多项,发表SCI论文40余篇。
  • 基金资助:
    国家自然科学基金(62105189);山东省高等学校青创科技支持计划(2022KJ231)

Growth and Optical Properties Modulation of I- Doped Cs3Bi2Br9 Crystals

CHEN Sixian(), XU Le, TANG Yuanzhi, SUN Haibin, GUO Xue, FENG Yurun, HU Qiangqiang()   

  1. School of Materials Science and Engineering,Shandong University of Technology,Zibo 255049,China
  • Received:2025-04-15 Online:2025-07-20 Published:2025-07-30

摘要: 本文采用溶液降温法成功制备了I-掺杂的Cs3Bi2Br9晶体(Cs3Bi2I x Br9-x ),系统研究了I-掺杂对Cs3Bi2Br9晶体结构、热稳定性与光学性能的影响。生长得到的Cs3Bi2I x Br9-x 晶体尺寸达5 mm,晶体呈现出橙红色,与未掺杂的黄色有明显区别。XRD结果表明,I-部分取代Br-后,晶体仍维持六方结构,属于P3m1空间群,衍射峰位向小角度偏移表明,掺杂晶体晶格因阴离子半径差异而发生膨胀。热重分析表明晶体在475.2 ℃下保持稳定,较未掺杂Cs3Bi2Br9晶体略有提升。光学测试发现,掺杂后晶体吸收截止边由486 nm红移至590 nm,带隙从2.61 eV降至2.18 eV,显著拓宽了光响应范围;光致发光(PL)峰蓝移至447 nm(半峰全宽97.7 nm,CIE坐标(0.27, 0.24)),荧光寿命呈现双指数衰减(τ1=2.18 ns,38%;τ2=32.32 ns,62%)。本研究证实,I-掺杂可实现Cs3Bi2Br9晶体热稳定性与光电性能的优化,为无铅钙钛矿在光电器件领域的应用提供新选择。

关键词: 钙钛矿材料; I-掺杂; Cs3Bi2Br9晶体; 溶液降温法; 光学性能

Abstract: In this study, I- doped Cs3Bi2Br9 crystals (Cs3Bi2I x Br9-x ) were successfully grown using the solution cooling method. The influence of I- doping on the crystal structure, thermal stability, and optical properties of Cs3Bi2Br9 was systematically investigated. The Cs3Bi2I x Br9-x crystals obtained through growth have a size of 5 mm.The doped crystal exhibits an orange-red color, which is distinctly different from the yellow color of the undoped crystal. The XRD results show that the doped crystal still maintains a hexagonal structure with the P3m1 space group, while displaying a shift of diffraction peaks towards smaller angles, indicating lattice expansion due to the difference in radius between the I- and Br-. Thermal analysis shows that the crystal remains stable up to 475.2 ℃, slightly higher than that of Cs3Bi2Br9. Optical tests reveal that after doping, the crystal absorption cut-off edge redshift from 486 nm to 590 nm, resulting in a decrease in the bandgap from 2.61 eV to 2.18 eV, thus significantly broadening the photoresponse range. The main photoluminescence (PL) peak blue shifts to 447 nm (with a full width at half maximum of 97.7 nm, CIE coordinates (0.27, 0.24)), and the fluorescence lifetime exhibits a double exponential decay (τ1=2.18 ns, 38%; τ2=32.32 ns, 62%). This study confirms that I- doping can achieve an optimization of the thermal stability and optoelectronic properties of Cs3Bi2Br9 crystals, providing a new pathway for the application of lead-free perovskites in the field of optoelectronic devices.

Key words: perovskite material; I- doping; Cs3Bi2Br9 crystal; solution cooling method; optical property

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