Ultra‐stable and Sensitive X‐ray Detectors Using 3D Hybrid Perovskitoid Single Crystals

, outperforming most low-dimensional perovskite detectors. Most strikingly, the detectors retain 79.6% of their initial sensitivity after 14 days of water immersion, highlighting exceptional moisture stability. This work is the first to construct moisture-stable high-performance X-ray detectors using 3D perovskitoid single crystals, advancing the development of stable X-ray detection.