A Polarization‐Sensitive Photodetector with Patterned CH₃NH₃PbCl₃ Film

Abstract

Perovskite 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.