Halide perovskites in wide‐spectrum photodetection

Abstract Metal‐halide perovskites have emerged as promising semiconductors for wide‐spectrum photodetection owing to their exceptional optoelectronic properties, tunable band gaps, and facile synthesis. Their strong light–matter interactions and long carrier diffusion lengths have enabled devices capable of detecting radiation across an extraordinary spectral range, from γ‐rays and x‐rays to ultraviolet (UV), visible, and near‐infrared (NIR) light. This review highlights key advancements in perovskite‐based photodetectors (PPDs) and phototransistors, with an emphasis on high responsivity, detectivity, and ultrafast response times. We categorize device architectures by dimensionality (0D–3D) and detection regime, covering recent innovations such as flexible, lead‐free, and self‐powered PPDs. Special attention is given to novel chiral perovskites and polarization‐sensitive photodetectors enabling circularly polarized light (CPL) discrimination. Furthermore, this work discusses the extension of perovskite detection to the single‐photon level and evaluates underlying mechanisms for optical, ionizing, and near‐infrared regimes. The review concludes with perspectives on challenges and future trends, emphasizing interface engineering, stability enhancement, and scalable fabrication toward next‐generation optoelectronic imaging and communication systems.