CVD deposited hybrid lead halide perovskite films for high responsivity, self powered photodetectors with enhanced photo stability under ambient conditions
Abstract 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 1014 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 (l 365 nm) illumination at 1 mW/cm2 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.