Universal Vapor‐Phase Synthesis of Large‐Scale Ultrathin Perovskites with Superior Stability for Photodetectors and Image Sensors

Abstract

Ultrathin halide perovskites have drawn tremendous attention in nano‐/micro‐optoelectronic devices due to their fascinating performance and capability for chip integration. Unfortunately, it is highly challenging to obtain large‐scale and chronically stable ultrathin halide perovskites for practical application. Herein, the universal low‐temperature vapor‐phase synthesis of ultrathin perovskite family materials with thickness down to 2D level and lateral size up to 1.5 cm × 1.5 cm is reported by developing a self‐limiting chemical vapor deposition strategy. The perovskite products are found to exhibit superior stability over 180 days under an air environment. The resultant photodetectors demonstrate charming optoelectronic properties such as superior responsivity (3.7 × 10³ A W⁻¹), ultrafast response time (<10 µs), and outstanding low‐level light image sensing capability. This universal perovskite synthesis strategy offers great potential for practical applications of halide perovskites in future nano‐/micro‐optoelectronic devices.