Fan Yipeng, Chen Qin, Li Zhou, Zhu Tingting, Wu Jianbo, You Shihai, Zhang Shuhua, Luo Junhua, Ji Chengmin
Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, Guangxi, 541004, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Small. 2023 Nov;19(45):e2303814. doi: 10.1002/smll.202303814. Epub 2023 Jul 7.
Halide hybrid perovskites are a kind of intriguing contenders for X-ray detection, and their low detection limits (LoDs) have played a crucial part in X-ray safety inspection and medical examination. However, there is still a significant challenge in manufacturing perovskite X-ray detectors with low LoDs. Herein, attributed to the bulk photovoltaic effect (BPVE) of a Dion-Jacobson (DJ) type 2D halide hybrid perovskite polar structure (3-methylaminopropylamine)PbBr (1), self-powered X-ray detection with low detection limit is successfully realized. Specifically, the crystal-based detector of 1 exhibits a low dark current at zero bias, which reduces the noise current (0.34 pA), leading to a low detection limit (58.3 nGy s ) which is two orders of magnitude lower than that of under external voltage bias. The combination of BPVE and LoDs of halide hybrid perovskite provides an efficient strategy to achieve passive X-ray detection with low doses.
卤化物混合钙钛矿是X射线检测中一类引人关注的候选材料，其低检测限在X射线安全检查和医学检查中发挥了关键作用。然而，制造具有低检测限的钙钛矿X射线探测器仍然面临重大挑战。在此，由于Dion-Jacobson（DJ）型二维卤化物混合钙钛矿极性结构（3-甲基氨基丙胺）PbBr（1）的体光伏效应（BPVE），成功实现了具有低检测限的自供电X射线检测。具体而言，基于晶体1的探测器在零偏压下呈现出低暗电流，这降低了噪声电流（0.34 pA），导致低检测限（58.3 nGy s），比外部电压偏压下的检测限低两个数量级。卤化物混合钙钛矿的BPVE和检测限的结合为实现低剂量被动X射线检测提供了一种有效策略。
