Water Erosion Highly Recoverable and Flexible Photodetectors Based on Electrospun, Waterproof Perovskite–Polymer Fiber Membranes

Recently, there has been significant interest in perovskite–polymer composite nanostructures due to their biological nontoxicity and excellent waterproof stability. However, the exploration of their potential in water erosion highly recoverable and flexible high-performance photodetectors remains limited. In this study, we propose a specific photodetector (PD) strategy based on the electrospun perovskite–polymer [polymethyl methacrylate (PMMA)] fiber membranes (PPFMs), where perovskite nanocrystals are uniformly embedded within the long PMMA microfibers. The Schottky contact PDs, formed by in situ growth of PPFMs on lateral electrodes, exhibit ∼97% recovery in performance after drying the devices from the water-induced short-circuit states. The capacitive contact PDs, achieved by dry transfer of PPFMs onto the electrodes, maintain stable photoresponse with less than 2-fold performance fluctuations upon exposure to water, thanks to the suppressed water infiltration effects. Furthermore, due to the strong self-adhesion and flexibility of electrospun PPFMs, which establish tight contact with the lateral electrodes without requiring additional treatments, the PDs retain almost 100% of their original performances even after undergoing 500 bending cycles to a folded state.