High-performance photodetector based on quasi-two-dimensional Ruddlesden-Popper perovskite PEAFAPbBr film

For next-generation Internet-of-Everything applications, such as artificial neural-network image sensors, artificial retina, visible light communication, flexible devices, and so on, the photodetectors with excellent properties are urgently demanded. In recent years, two-dimensional (2D) material-based photodetectors have been developed and certified for remarkable performances. Nonetheless, it cannot meet the need of wide linear dynamic range, ultralow dark current, and large on/off ratio, which are critical factors for commercial applications. Recently, quasi-2D Ruddlesden-Popper (RP) perovskites are explored and developed as well-known photovoltaic and optoelectronic materials. Herein, an excellent photodetector based on quasi-2D RP layered perovskite PEAFAPbBr film was fabricated. The photodetector displays an ultralow dark current of 4.08 × 10 A, high specific detectivity of 1.69 × 10 Jones, high on/off ratio of 7.33 × 10, and fast rise/fall times of 32/38 ms, attributed to its multiple quantum wells in PEAFAPbBr. Therefore, the photodetectors based on quasi-2D RP perovskite PEAFAPbBr have immense potentials in the field of optoelectronics.