High-performance all-fiber-integrated perovskite photodetector based on FA_0.4MA_0.6PbI₃

The performance of an all-fiber-integrated photodetector (AFPD) depends on the integration of the active layer, where FA 0.4 MA 0.6 PbI 3 emerges as a promising candidate due to its high absorbance, long carrier diffusion distance, and self-assembly. In this study, we report an AFPD based on FA 0.4 MA 0.6 PbI 3 perovskite, along with thickness design for enhancement. The active layer of the AFPD is regarded as a thin-film waveguide for thickness design. Theoretical analysis and simulation results indicate the presence of resonance mode, enhancing and confining the light field even in a thinned active layer. An FA 0.4 MA 0.6 PbI 3 based metal-semiconductor-metal (MSM) photodetector is directly deposited onto a side-polished multimode fiber (SP-MMF). The transmitted light in fiber leaks from the 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 8 ms. The proposed AFPD and method exhibit potential to simultaneously achieve high responsivity, fast response, and low insertion loss, providing a reliable solution for high-performance photodetection.