无铅钙钛矿Cs3Bi2I9单晶的制备及光电性能研究

摘要/Abstract

摘要： 采用蒸发结晶法在低温常压条件下制备Cs₃Bi₂I₉单晶,温度为60~90 ℃,保温时间为18~30 h。研究温度和保温时间对Cs₃Bi₂I₉单晶晶体结构和光学性能的影响。使用机械剥离法制备基于柔性衬底的Cs₃Bi₂I₉单晶薄膜,研究薄膜的电学性能。结果表明,在结晶度最优的目标下,Cs₃Bi₂I₉单晶制备的优化工艺条件为温度60 ℃,保温时间26 h。温度和保温时间对Cs₃Bi₂I₉单晶的结晶度、紫外可见光吸光度和光致发光性能的影响一致。柔性Cs₃Bi₂I₉单晶薄膜具有显著的光电特性,且工作时具有良好的稳定性。Cs₃Bi₂I₉单晶薄膜的弯折耐久度良好,90°弯折100次后,仍能保持原有性能的84.4%。无铅钙钛矿Cs₃Bi₂I₉单晶薄膜在柔性光电传感器件上具有潜在的应用前景。

关键词: 无铅钙钛矿, Cs₃Bi₂I₉, 单晶, 柔性薄膜, 机械剥离, 结晶度

Abstract: Cs₃Bi₂I₉ single crystals were prepared by evaporative crystallization method at the conditions of low temperature and atmospheric pressure, with temperature ranging from 60 ℃ to 90 ℃ and holding time ranging from 18 h to 30 h. The effects of temperature and holding time on the crystal structure and optical properties of Cs₃Bi₂I₉ single crystals were investigated. The Cs₃Bi₂I₉ single crystal film based on flexible substrate was prepared by mechanical exfoliation method and its electrical properties were studied. The results show that, for the best crystallinity target, the optimal parameters for the growth of Cs₃Bi₂I₉ single crystals are the temperature of 60 ℃ and holding time of 26 h. The effects of temperature and holding time on the crystallinity, ultraviolet visible light absorbance, and photoluminescence properties of Cs₃Bi₂I₉ single crystals are consistent. The flexible Cs₃Bi₂I₉ single crystal film has obvious photoelectric properties, and shows excellent stability during work. Cs₃Bi₂I₉ single crystal film has outstanding bending durability. After bending 100 times at the angle of 90°, the performances of Cs₃Bi₂I₉ single crystal film still maintain at 84.4% of the original performances. Lead-free perovskite Cs₃Bi₂I₉ single crystal film has potential application prospects in flexible photoelectric sensor devices.

Key words: lead-free perovskite, Cs₃Bi₂I₉, single crystal, flexible film, mechanical exfoliation, crystallinity

中图分类号:

TB34

欧阳文锦, 徐浩尧, 贺振华. 无铅钙钛矿Cs₃Bi₂I₉单晶的制备及光电性能研究[J]. 硅酸盐通报, 2023, 42(8): 2968-2975.

OUYANG Wenjin, XU Haoyao, HE Zhenhua. Preparation and Photoelectric Properties of Lead-Free Perovskite Cs₃Bi₂I₉ Single Crystals[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2968-2975.

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无铅钙钛矿Cs₃Bi₂I₉单晶的制备及光电性能研究

Preparation and Photoelectric Properties of Lead-Free Perovskite Cs₃Bi₂I₉ Single Crystals

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