Chu Depeng, Liu Naiming, Xie Shenghui, Li Yaohui, Chen Jingjing, Wei Mingyue, Feng Ziyang, Zhao Lei, Jia Binxia, Jiang Yujia, Pi Jiacheng, Shi Ruixin, Yue Shengying, Liu Yucheng, Frank Liu Shengzhong
School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China.
Laboratory for Multiscale Mechanics and Medical Science, SV LAB, School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Adv Mater. 2025 Jul;37(27):e2500101. doi: 10.1002/adma.202500101. Epub 2025 Apr 23.
Metal-halide perovskite single crystals (SCs) are promising candidates for next-generation X-ray detectors. X-ray detectors fabricated using perovskite FAPbI 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 SCs. In this study, large high-quality perovskite FAPbI 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 SCRs, the SC detectors realize a record high X-ray detection sensitivity (2.16 × 10 µC Gy cm) and high sensitivity to dark current density ratio (1.93 × 10 Gy s). Furthermore, the detectors exhibit both ultralow dark and X-ray current drifts, as well as a detection limit of 2 nGy s. These characteristics enable the detectors to achieve high-resolution X-ray imaging, even at dose rates as low as 12 nGy s. 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.
金属卤化物钙钛矿单晶是下一代X射线探测器的有前途的候选材料。使用钙钛矿FAPbI单晶制造的X射线探测器具有高检测灵敏度。然而，在实际应用中仍有两个紧迫问题需要解决：高质量FAPbI单晶的取向控制生长和环境友好获取。在本研究中，使用生物质衍生的绿色溶剂生长出具有独特取向的大型高质量钙钛矿FAPbI单晶棒。由于取向的FAPbI单晶棒具有高载流子迁移率和大体积电阻率，单晶探测器实现了创纪录的高X射线检测灵敏度（2.16×10 µC Gy cm）和高暗电流密度比灵敏度（1.93×10 Gy s）。此外，探测器表现出超低的暗电流和X射线电流漂移，以及2 nGy s的检测限。这些特性使探测器即使在低至12 nGy s的剂量率下也能实现高分辨率X射线成像。本研究不仅为低剂量X射线检测提供了一种新的技术解决方案，还为低成本、环境友好地生产X射线探测器的核心材料建立了一种新方法。
