Stable and Ultrasensitive X‐Ray Detectors Based on Oriented Single‐Crystal Perovskite Rods
Depeng Chu, Naiming Liu, Shenghui Xie, Yaohui Li, Jingjing Chen, Mingyue Wei, Ziyang Feng, Lei Zhao, Binxia Jia, Yujia Jiang, Jiacheng Pi, Ruixin Shi, Shengying Yue, Yucheng Liu, Shengzhong Liu
Abstract
Abstract Metal‐halide perovskite single crystals (SCs) are promising candidates for next‐generation X‐ray detectors. X‐ray detectors fabricated using perovskite FAPbI 3 SCs exhibit high detection sensitivity. However, two pressing issues still need to be addressed for practical applications: the orientation‐controlled growth and environmentally friendly acquisition of high‐quality FAPbI 3 SCs. In this study, large high‐quality perovskite FAPbI 3 SC rods (SCRs) with unique orientation are grown using a biomass‐derived green solvent. Owing to the high carrier mobility and large bulk resistivity of the oriented FAPbI 3 SCRs, the SC detectors realize a record high X‐ray detection sensitivity (2.16 × 10 5 µC Gy −1 cm −2 ) and high sensitivity to dark current density ratio (1.93 × 10 9 Gy −1 s). Furthermore, the detectors exhibit both ultralow dark and X‐ray current drifts, as well as a detection limit of 2 nGy s −1 . These characteristics enable the detectors to achieve high‐resolution X‐ray imaging, even at dose rates as low as 12 nGy s −1 . This study not only contributes a new technical solution for low‐dose X‐ray detection, but also establishes a new approach for the low‐cost and environmentally friendly production of core materials for X‐ray detectors.