Methylammonium-Based Quasi-Two-Dimensional Perovskite Single Crystals for Highly Sensitive X-ray Detection and Imaging
Shuai‐Hua Wang, Fang Wang, Xieming Xu, Nan Zhang, Rui Zhang, Lingfei Lv, Xiao‐Ming Jiang, Xin Huang, Shaofan Wu, Yuchong Ding
Abstract
The strategy of introducing large organic cations into three-dimensional perovskites could reduce the dimensionality of perovskites to form quasi-two-dimensional (quasi-2D) perovskites, resulting in increased stability and reduced detection limits due to less ion migration. Herein, a quasi-2D perovskite single crystal (BDA)(MA) 2 Pb 3 Br 10 (BDA = NH 3 C 4 H 8 NH 3, MA = CH 3 NH 3 ) with a layered structure was grown by the temperature-cooling solution method. The X-ray detector based on the (BDA)(MA) 2 Pb 3 Br 10 single crystal has a sensitivity as high as 1984 μC Gy –1 cm –2 at 55.6 V/mm, and it could detect X-rays as low as 28.12 nGy s –1 at 22.2 V/mm. In addition, the X-ray imaging system based on the single-crystal device easily distinguishes between metals and plastics and exhibits a spatial resolution estimated as 250 μm, indicating the feasibility of (BDA)(MA) 2 Pb 3 Br 10 crystals for X-ray imaging. This research offers a method for the design of quasi-2D layered perovskites and enhances photoelectronic applications in X-ray inspection and imaging.