Photodetectors are essential components in the Internet of Things (IoT); however, most conventional photodetectors generate only transient photocurrents, requiring additional processors for data storage. Professor Jung-Yao Chen’s team has developed an innovative non-volatile flash photomemory, achieving a programming time of 0.7 ms and a photoresponsivity of 1.91×10^4 mA W^-1. Furthermore, the integration of a hydrogen-sensitive gasochromic film with the photomemory enables hydrogen leakage detection.