Fast chemical vapor-solid reaction for synthesizing organometal halide perovskite array thin films for photodetector applications

Abstract

Preparing organometal halide perovskite array thin films from solution is a big challenge due to its soluble nature. In this work, we provide a fast chemical vapor-solid reaction (FCVR) for fabricating perovskite array thin films. An elemental Pb array thin film was firstly prepared by magnetron sputtering using a shadow mask, which then converted to CH3NH3PbI3 arrays by reacting with CH3NH3I. The related photoelectric characteristics were investigated by Uv–Vis spectroscopy, photoluminescence spectroscopy, and transient photovoltage analysis. The photodetector devices were assembled using these resultant perovskite thin films, which showed a fast response with 3 ms rise time and 3 ms decay time both under 405 nm and 660 nm light illumination. The response was faster than the commercial photodetector. This FCVR method not only provides a high quality perovskite array thin film, but also a novel synthesis strategy for new organic-inorganic hybrid perovskite photoelectric materials.