Interlamellar-Spacing Engineering of Stable and Toxicity-Reduced 2D Perovskite Single Crystal for High-Resolution X-ray Imaging
Yuqian Liang, Zeqin Zhao, Jinglu Hao, Yunxia Zhang, Depeng Chu, Binxia Jia, Jiacheng Pi, Lei Zhao, Mingyue Wei, Ziyang Feng, Yaohui Li, Ruixin Shi, Xiaojie Zhang, Zupei Yang, Xiaolian Chao, Shengzhong Liu, Yucheng Liu
Abstract
Two-dimensional (2D) lead halide perovskites are excellent candidates for X-ray detection due to their high resistivity, high ion migration barrier, and large X-ray absorption coefficients. However, the high toxicity and long interlamellar distance of the 2D perovskites limit their wide application in high sensitivity X-ray detection. Herein, we demonstrate stable and toxicity-reduced 2D perovskite single crystals (SCs) realized by interlamellar-spacing engineering via a distortion self-balancing strategy. The engineered low-toxicity 2D SC detectors achieve high stability, large mobility-lifetime product, and therefore high-performance X-ray detection. Specifically, the detectors exhibit a record high sensitivity of 13488 μC Gy 1– cm –2, a low detection limit of 8.23 nGy s –1, as well as a high spatial resolution of 8.56 lp mm –1 in X-ray imaging, all of which are far better than those of the high-toxicity 2D lead-based perovskite detectors. These advances provide a new technical solution for the low-cost fabrication of low-toxicity, scalable X-ray detectors.