A Review on Millimeter‐Thickness Polycrystalline Perovskite for High‐Performance Direct X‐Ray Detection

ABSTRACT Metal halide perovskites (MHPs) have been proven to have excellent direct X‐ray detection properties due to their high carrier lifetime product, strong X‐ray absorption ability, a low electron‐hole pair creation energy, and excellent charge transport properties. Millimeter‐thickness polycrystalline MHPs (MPMHPs) can effectively utilize X‐rays and have detection performance comparable to single‐crystal MHP, and it is less difficult to synthesize. In this paper, we review the direct X‐ray detectors and imagers based on MPMHPs. The basic knowledge of X‐ray and direct X‐ray detectors is introduced. This review focuses on describing in synthesis methods of MPMHPs and their X‐ray detection performance. Furthermore, we summarize the X‐ray imaging scheme and imaging application results of MPMHPs. Finally, we discuss future optimization methods in material synthesis, device optimization, and imaging applications. We hope that this review will help readers understand the basics of MPMHPs, improve detection performance, and boost imaging applications.