High-Detectivity and sensitive UVA photodetector of polycrystalline CH3NH3PbCl3 improved by α-Ga2O3 nanorod array

The detection and quantification of UVA radiation are indispensable for the reason that excess UVA radiation is harmful to skin, eyes, immune system and blood vessels of the human body. This study demonstrates a high-performance and accurate UVA (320–400 nm) detector based on polycrystalline CH3NH3PbCl3/α-Ga2O3 nanorod array hybrid structure, which was fabricated by using facile and low-cost solution processing method. The devices show the maximum responsivity of 8.02 mA/W under zero bias, which is two orders of magnitude larger than bare polycrystalline CH3NH3PbCl3 photodetector, as well as high speed photo-switching. Meanwhile, the detectivity of this self-powered device reaches up to 1.9 × 1011 Jones, which is even superior to most of the reported single-crystal CH3NH3PbCl3 photodetectors. This study reveals the potential in the combination of ultra-wide bandgap inorganic semiconductors with polycrystalline organic–inorganic hybrid perovskites in high performance of photodetector and other optoelectronic devices.