Self-Powered, Fast Response Quadruple Cation Perovskite Photodetector With Al 2 O 3 Nanoparticles as Interfacial Modification Layer

This study presents the fabrication and characterization of self-powered (0 V bias) perovskite photodetectors with a fast response time. We fabricated a RbCsMAFAPb(IBr)$_{3}$perovskite photodetector in an n-i-p planar architecture and systematically analyzed its performance. The device achieves an external quantum efficiency (EQE) exceeding 55% and a peak responsivity of 0.306 A/W at 730 nm. At the same wavelength, it demonstrates a detectivity of$2.36 \times 10^{11}$Jones. With a rise time of 0.286ms, the detector exhibits a competitive response speed among perovskite photodetectors. The device exhibited good stability over the course of 10 days. Furthermore, we investigated the incorporation of Al$_{2}$O$_{3}$nanoparticles in the electron transport layer (ETL) and their impact on the morphology of the perovskite film.