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 mu C Gyair-1 cm-2, a low detection limit of 5.7 nGyair 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 mu Gyair, 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. Low-dimensional Dion-Jacobson (DJ) perovskites are utilized to fabricate low dose and stable X-ray imagers. By tuning the chemical structure of diammonium interlayers, both the charge transport performance and structural stability of the material are significantly enhanced. Consequently, flat perovskite X-ray imagers with sensitivity of 18000 mu C Gyair-1 cm-2, detection limit of 5.7 nGyair s-1, and spatial resolution of 3.7 lp mm-1 are achieved. image