Dual-Mode 2D Perovskite X-Ray Detector With High Sensitivity and Spatial Resolution

Metal halide perovskites have been promising materials for radiation detectors. However, ion migration in perovskite semiconductors and thermal quenching in perovskite scintillators deteriorate the performance of direct and indirect X-ray detection. Here, we propose a dual-mode perovskite X-ray detector by transferring a two-dimensional (2D) (PEA)2PbI4 perovskite microsheet on Au interdigital electrodes. High-quality 2D perovskite (PEA)2PbI4 possesses ion migration suppression and quantum confinement effect, rendering the simultaneous operation of the X-ray detector in direct semiconductor mode and indirect scintillation mode. The detector shows a good sensitivity of $169.8 \mu \text{C} \ \mathrm{Gy}_{\text {air}}^{-{1}}$ cm−2 and the spatial resolution is 13.8 lp mm−1. Our work opens a new path for high sensitivity and spatial resolution 2D perovskites dual-mode radiation detectors.