Antisolvent‐Induced Fastly Grown All‐Inorganic Perovskite CsPbCl3 Microcrystal Films for High‐Sensitive UV Photodetectors

Abstract CsPbCl 3 ‐based inorganic perovskite ultraviolet photodetectors (UV‐PDs) have a great promise for the wide application prospects due to the desirably UV‐matched energy band and the excellent intrinsic optoelectronic properties. However, the traditional high‐temperature Bridgman method (near 600 °C) and complexly time‐consuming vapor preparation (several days) of high‐quality CsPbCl 3 crystals have badly restricted its commercial applications to date. Herein, an antisolvent‐induced crystallization kinetics (ACK) strategy is demonstrated for the quick lower‐temperature fabrication (50 °C, tens of minutes) of excellent continuous highly crystalline CsPbCl 3 microcrystal films (MCFs) with low trap density (1.42 × 10 12 cm −3 ). Further, the as‐developed CsPbCl 3 MCF‐based UV‐PDs present a high detectivity of 5.6 × 10 12 Jones, a superior responsivity of 2.11 A W −1 , and robust stability. Evidently, this work provides a rapid and simple method to prepare high‐quality perovskite MCFs, greatly promoting the commercial development of perovskite‐based photodetectors.