A High‐Performance Flexible Broadband Photodetector Based on Graphene–PTAA–Perovskite Heterojunctions

Abstract

Abstract Organometal halide perovskites (CH 3 NH 3 PbI 3− x Cl x ) have received considerable attention in the field of optoelectronics due to their strong light absorption and long carrier lifetime. However, the performance such as response speed, responsivity, and stability of such detectors still need to be improved. In this paper, a flexible photodetector (PD) composed of multilayered structure of graphene–poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA)–perovskite‐poly(methyl methacrylate) (PMMA) is proposed. The PD can detect a wide wavelength range from ultraviolet to near infrared. The PD shows a high detectivity of ≈10 13 Jones and a responsivity of 10 5 A W −1 at 360 nm. More importantly, the device also shows a high bending durability, fast response time, and good stability in air due to the protection of the PMMA layer. The facile and low‐cost fabrication of the flexible perovskite‐based hybrid photodetector indicates the mass production for the potential application in sensitive broadband photodetection.