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Large Lead‐Free Perovskite Single Crystal for High‐Performance Coplanar X‐Ray Imaging Applications
Author(s) -
Liu Yucheng,
Zhang Yunxia,
Yang Zhou,
Cui Jian,
Wu Haodi,
Ren Xiaodong,
Zhao Kui,
Feng Jiangshan,
Tang Jiang,
Xu Zhuo,
Liu Shengzhong Frank
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000814
Subject(s) - materials science , perovskite (structure) , single crystal , optoelectronics , crystallite , x ray detector , crystal (programming language) , electrical resistivity and conductivity , particle detector , detector , optics , nuclear magnetic resonance , crystallography , chemistry , physics , programming language , quantum mechanics , computer science , metallurgy
Lead‐based (Pb) perovskite recently emerged as a promising photoelectric material for direct ionization radiation detection with outstanding performance. Unfortunately, its application is limited due to its toxicity caused by high Pb content, serious ion migration, poor crystallite quality, unsatisfactory reproducibility, high resistivity, and large fluctuation of electronic properties. Herein, a better substitute of lead‐free inch‐sized (34.3 mm × 34.3 mm × 13.1 mm) high‐quality halide (CH 3 NH 3 ) 3 Bi 2 I 9 single crystal (MA 3 Bi 2 I 9 SC) is presented with higher resistivity, lower ion migration, and better stability. The coplanar detector fabricated using the MA 3 Bi 2 I 9 SC shows low dark noise current and outstanding X‐ray response including a high sensitivity of 872 μ C Gy −1 cm −2 , short response time of 266 μs, low detection limit of 31 nGy s −1 , good spatial resolution of 4.22 lp mm −1 , long‐term working stability, and excellent uniformity. Thanks to these excellent properties, the coplanar MA 3 Bi 2 I 9 SC X‐ray detector array shows high‐resolution X‐ray imaging. The present report may inspire development of next‐generation high‐energy radiation detection and imaging using lead‐free perovskite single crystals.