Fig. 1. Schematic diagram of a photodetector based on CsPbBr₃ microcrystal film

Fig. 2. (a) Typical SEM images showing the morphology of CsPbBr₃ microcrystal films; (b) XRD spectrum of CsPbBr₃ microcrystal films

Fig. 3. Schematic of the femtosecond laser damage experiment setup

Fig. 4. Schematic of the reproducible on/off switch of the device

Fig. 5. Micrograph of a sample irradiated by femtosecond pulse lasers with power densities of (a) 0 W/cm², (b) 2.1 W/cm², (c) 2.6 W/cm² and (d) 3.2 W/cm²

Fig. 6. Spectral responsivity of a sample after being damaged by a femtosecond laser with different power densities

Fig. 7. Photocurrent generation of a sample irradiated by femtosecond laser irradiation under power densities of (a) 0 W/cm², (b) 2.1 W/cm², (c) 2.6 W/cm² and (d) 3.2 W/cm²