Anomalous Photovoltaic Effect in a Chiral Alternating‐Cation Intercalation‐Type Perovskite for Efficient Self‐Driven X‐Ray Detection

Organic-inorganic hybrid perovskites (OIHPs) exhibiting intrinsic anomalous photovoltaic (APV) effects have attracted considerable attention due to their exceptional optoelectronic and photovoltaic properties. However, the ionizing radiation-induced APV effect, a promising mechanism for self-powered X-ray detection, remains underexplored in OIHPs. Here, this study reports for the first time the radiation-induced APV in 2D OIHPs for efficient self-driven X-ray detection. Specifically, the 2D chiral alternating cation-intercalated perovskite (R)-PPA(MOPA)PbBr₄ (where PPA = 1-phenylpropylammonium and MOPA = 3-methoxypropylammonium) demonstrates an intrinsic radiation-induced APV of 4 V, which facilitates the separation and transport of X-ray-generated carriers. Remarkably, leveraging this intrinsic APV, highly efficient X-ray detection is achieved with a high sensitivity of 475 µC Gy⁻¹ cm⁻² at zero bias, surpassing most existing self-powered X-ray detectors. These findings underscore the potential of radiation-responsive APV effects in advanced self-driven X-ray detection and pave the way for future practical applications.