High-Stability Patterned CsPbIxBr3-x Thin Films with Tunable Crystal Size Prepared by Solid-Phase Reaction

Downsides such as pollution, stability, and cost limit the further optoelectronic applications of cesium lead halide inorganic perovskite thin films, prepared using traditional liquid-phase and vapor-phase reactions. This study investigates the preparation of inorganic perovskite CsPbIxBr3-x (x = 0, 1, 2, 3) thin films based on a solid-phase reaction. Two solid-phase precursor thin films, with an appropriate thickness ratio, are deposited by pulsed laser deposition (PLD) and subsequently react under high temperature, without any by-products or gas volatilization. Relying on lower structural destruction from solution evaporation, and a reduced intermolecular distance of PLD-prepared solid-phase precursors, the inorganic perovskite photodetectors based on a solid-phase reaction demonstrate enhanced stability under ultrahigh humidity (90-95%). By altering the thickness of the two precursors, the crystal size of the inorganic perovskite thin films can be adjusted within the range from 40 to 150 nm. Reusable metallic masks can be applied on the PLD-prepared precursors to prepare high-precision inorganic perovskite arrays (9.6 mu m). The results demonstrate the significance of a solid-phase reaction method in the commercial application of inorganic perovskite optoelectronic devices.