LAUSR

In recent years, solution‐processed lead trihalide perovskites have been widely used as semiconductors in photodetectors with their salient features of tunable direct bandgap, long carrier lifetime, extended diffusion length, and high carrier mobility, etc. For the photodetector application, perovskites with different structures ranging from the traditional 3D perovskites to the emerging 2D perovskites, to 1D nanowires, and to 0D quantum dots, have been synthesized. In this perspective, the recent advances in the strategies of preparing novel lead trihalide perovskites with different nanostructures are summarized together with an overview on their application in photodetectors including photoconductors, photodiodes, and phototransistors. The semiconductor selection and structure–performance relationships of various photodetectors over the past 5 years are discussed comprehensively. Finally, a brief summary as well as an in‐depth discussion regarding the current challenges and perspectives for the future development of perovskite‐based photodetectors is presented.