High responsivity all-fiber-integrated perovskite photodetector based on FA0.4MA0.6PbI3

Perovskite exhibits advantages including tunable bandgap, high absorbance and self-assembly, making it potential for high-performance photodetection. In this study, we report an all-fiber-integrated photodetector (AFPD) based on FA0.4MA0.6PbI3 perovskite. The thickness of photodetector’s active layer is designed based on the thin-film waveguide mechanism to optimize device’s responsivity. Theoretical analysis and simulation results indicate the presence of a strong mode field in the active layer meeting the resonance thickness condition, which exhibits the potential to enhance material’s light absorption efficiency and improve device’s responsivity even in a thinned film. Metal-Semiconductor-Metal (MSM) photodetector based on FA0.4MA0.6PbI3 is directly deposited onto a side-polished multimode fiber (SP-MMF). Light transmitted in fiber leaks from core to the MSM photodetector through the polished surface of SP-MMF, inducing a detection response. Experimental results demonstrate that the device achieves a responsivity of 3.2 A/W to 650 nm light, with both rising and falling edges of the response time reaching 8ms. The proposed AFPD exhibits advantages including high responsivity, short response time, low insertion loss and all-fiber integration, providing a reliable solution for the development of high performance AFPD.