Solution-processed and self-powered photodetector in vertical architecture using mixed-halide perovskite for highly sensitive UVC detection

Abstract

In this study, a self-powered lead-halide perovskite-based deep-ultraviolet (UV) photodetector was prepared using a solution process. A heterojunction of mixed (FAPbI₃)_0.97(MAPbBr₃)_0.03 perovskite was utilized as the photo-absorber layer, and spiro-OMeTAD was utilized as the hole injection layer in a vertical structure. The device exhibited an outstanding on/off photocurrent ratio of more than 10³, a good responsivity of 52.68 mA W⁻¹, and a high detectivity of 4.65 × 10¹¹ Jones under 254 nm UV illumination without an external bias. Moreover, the detector demonstrated superior stability while retaining a quick response speed after three weeks of storage in ambient air without encapsulation. Thus, the present study has developed a promising photodetector for several applications in the deep-UV region.