Low-Dose and Stable X-Ray Imaging Enabled by Low-Dimensional Dion-Jacobson Perovskites

Metal halide perovskites have emerged as highly promising candidates for next-generation X-ray detectors due to their facile and low-cost processability, high attenuation coefficient, and tunable optoelectrical properties. In this work, quasi-2D Dion-Jacobson (DJ) perovskites are introduced in a flat panel X-ray imager (FPXI) for X-ray imaging. This study demonstrates that the diammonium interlayers in DJ perovskites play a key role in enhancing structural stability, suppressing ion migration, and improving charge transport. As a result, DJ perovskite-based X-ray FPXIs achieve a sensitivity of 18000 µC Gy air −1 cm −2 , a low detection limit of 5.7 nGy air s −1 , representing performance comparable to that of state-of-the-art 3D perovskite FPXIs. Thanks to the decrease in the signal crosstalk effect of the FPXIs, a high spatial resolution of 0.54 line-pair-per-pixel is achieved, which is higher than that of 3D perovskite FPXIs. Remarkably, high-quality X-ray imaging is achieved at a total dose of 20 µGy air , which is only 1/5 of the dose typically used in commercial equipment. This work not only provides valuable insights and guidance for the fabrication of 2D DJ perovskite X-ray detectors but also lays the groundwork for the adoption of high-performance, stable DJ perovskite imagers as novel flat-panel X-ray detectors.