Cation-π interactions enabled water-stable perovskite X-ray flat mini-panel imager
Wanting Pan, Yuhong He, Weijun Li, Lulu Liu, Keke Guo, Jianglei Zhang, Wang Chao, Bao Li, Hu Huang, Junhu Zhang, Bai Yang, Haotong Wei
Abstract
Abstract Sensitive and stable perovskite X-ray detectors are attractive in low-dosage medical examinations. The high sensitivity, tunable chemical compositions, electronic dimensions, and low-cost raw materials make perovskites promising next-generation semiconductors. However, their ionic nature brings serious concerns about their chemical and water stability, limiting their applications in well-established technologies like crystal polishing, micro-processing, photolithography, etc. Herein we report a one-dimensional tryptamine lead iodide perovskite, which is stable in water for several months as the strong cation-π interactions between organic cations. The one-dimensional and two-dimensional tryptamine lead iodide perovskite tablets are switchable through thermal-annealing or water-soaking treatments to relax microstrains. The water-stable and microstrain-free one-dimensional perovskite tablets yield a large sensitivity of 2.5 × 10 6 μC Gy air −1 cm −2 with the lowest detectable dose rate of 5 nGy air s −1 . Microelectrode arrays are realized by surface photolithography to construct high-performance X-ray flat mini-panels with good X-ray imaging capability, and a record spatial resolution of 17.2 lp mm −1 is demonstrated.