CVD-deposited hybrid lead halide perovskite films for high-responsivity, self-powered photodetectors with enhanced photo stability under ambient conditions

Hybrid lead halide perovskites possess highly attractive optoelectronic properties that make them suitable for high-performance, self-powered photodetectors. Chemical vapor deposition (CVD) allows the large-area fabrication of high-quality polycrystalline perovskite thin films with large grain size, hence highly attractive as the active layer for self-powered photodetectors. In this study, CVD-deposited perovskite films were employed to realize high-performance sandwich-type photodetectors responsive in the visible range. In self-powered mode, these devices delivered a responsivity as high as 112 A/W, a specific detectivity of 3.5 x 10(14) Jones and an external quantum efficiency of 22,042% under red light. Further, these devices exhibited good moisture stability and negligible photoresponse degradation after 2160 h in ambient conditions. The long-term stability of their photoresponse was additionally demonstrated under UV (lambda = 365 nm) illumination at 1 mW/cm(2) for 500 h. Our CVD-deposited perovskite films offer a promising avenue for the realization of high-performance, self-powered photodetectors with good operating stability for next-generation optoelectronic systems and their applications.