Investigation of Interface Effect on the Performance of CH₃NH₃PbCl₃/ZnO UV Photodetectors

Abstract

Recent investigations indicate that the performance of organic-inorganic perovskite optoelectronic devices can be improved by combining the perovskites and the inorganic materials. However, very few studies have focused on the investigation of perovskites/inorganic semiconductor hybrid UV photodetectors and their detailed performance-enhancement mechanism is still not very clear. In this work, a CH₃NH₃PbCl₃/ZnO UV photodetector has been first demonstrated and investigated. Both the photoresponsivity and response speed of the hybrid device are higher than those of pure CH₃NH₃PbCl₃ and ZnO devices. The photoluminescence and transient absorption spectra indicate that the photoinduced electron transfer between CH₃NH₃PbCl₃ and ZnO should be responsible for the performance enhancement of the hybrid device. In addition, the high crystal quality of CH₃NH₃PbCl₃ on ZnO film is another important reason for the excellent UV detection performance. Our findings in this work provide new insights into the intrinsic photophysics essential for perovskite optoelectronic devices.