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

Recently, there has been significant interest in perovskite-polymercomposite nanostructures due to their biological nontoxicity and excellentwaterproof stability. However, the exploration of their potentialin water erosion highly recoverable and flexible high-performancephotodetectors remains limited. In this study, we propose a specificphotodetector (PD) strategy based on the electrospun perovskite-polymer[polymethyl methacrylate (PMMA)] fiber membranes (PPFMs), where perovskitenanocrystals are uniformly embedded within the long PMMA microfibers.The Schottky contact PDs, formed by in situ growth of PPFMs on lateralelectrodes, exhibit & SIM;97% recovery in performance after dryingthe devices from the water-induced short-circuit states. The capacitivecontact PDs, achieved by dry transfer of PPFMs onto the electrodes,maintain stable photoresponse with less than 2-fold performance fluctuationsupon exposure to water, thanks to the suppressed water infiltrationeffects. Furthermore, due to the strong self-adhesion and flexibilityof electrospun PPFMs, which establish tight contact with the lateralelectrodes without requiring additional treatments, the PDs retainalmost 100% of their original performances even after undergoing 500bending cycles to a folded state.