A Reconfigurable Ultraflexible Paper-Based Perovskite Photodetector for In-Sensor Image Preprocessing

Bioinspired reconfigurable photodetectors (PD) promise to address complex image processing challenges, yet existing devices are often hindered by complex fabrication and rigid formats. Here, we present an ultraflexible, paper-based perovskite photodetector fabricated via a simple one-pot approach. The device leverages UV-assisted ion redistribution at perovskite/cellulose interfaces to achieve multimode bidirectionally tunable photoresponsivity (from −51.7 to +52.5 μA/W at zero bias under 520 nm illumination) with high linearity. It exhibits exceptional mechanical robustness, maintaining stable performance after 10,000 bending cycles at a 5 mm radius. Leveraging this reconfigurability, we demonstrate in-sensor image preprocessing (including grayscale inversion, smoothing, and sharpening) and achieve up to 98% classification accuracy for blurred patterns. This work provides a low-cost, biodegradable platform for intelligent vision systems in wearable and biointegrated electronics.