A Polarization‐Sensitive Photodetector with Patterned CH3NH3PbCl3 Film

Abstract

AbstractPerovskite photodetectors with polarization‐sensitive properties have gained significant attention due to their potential applications in fields such as imaging and remote sensing. Most perovskite photodetectors concentrate on iodine (I) or bromine (Br)‐based materials, primarily due to their straightforward fabrication techniques. The utilization of chloride (Cl)‐based perovskites with wider bandgaps, such as CH3NH3PbCl3, is relatively limited. In this work, polarized perovskite photodetectors are prepared by a patterned spatially confined method with polarization sensitivity and excellent optoelectronic properties. The patterned perovskite photodetectors (PP‐PDs) not only exhibit outstanding photoelectric conversion performance but also demonstrate polarization sensitivity. PP‐PDs showcase remarkable performance, including on/off ratios of 3.4 × 104, an extremely low dark current of 1.56 × 10−11 A, and a rapid response time of microseconds. The responsivity and detectivity of PP‐PDs reach 10.6 A W−1 and 3 × 1012 Jones, respectively, positioning them as among the highest‐performing MAPbCl3‐based photodetectors reported to date. Furthermore, polarization layered imaging sensing is achieved using stepwise scanning of the device. This work provides innovative ideas for realizing high‐performance polarized perovskite photodetectors.