Visible blind ultraviolet photodetector based on CH_3NH_3PbCl_3 thin film

We report a prototypical device of CH₃NH₃PbCl₃ film ultraviolet photodetectors that were fabricated with a coplanar metal-semiconductor-metal Au interdigital electrode configuration. Pure phase CH₃NH₃PbCl₃ films with a good crystallinity were formed by a hybrid sequential deposition process featured with inter-diffusion of PbCl₂ and CH₃NH₃Cl upon annealing. The CH₃NH₃PbCl₃ film photodetector exhibits a high responsivity of 7.56 A /W at 360 nm, a ultraviolet/visible rejection ratio (R360 nm/R500 nm) was about two orders of magnitude and fast response speed with a rising time of 170 μs and a decay time of 220 μs. All the above results demonstrate CH₃NH₃PbCl₃ film photodetector as a competitive candidate in the application of visible blind UV detectors.