多功能PbI₂实现具有超弱光检测能力的自驱动钙钛矿纳米线光电探测器

High-performance perovskite photodetectors with self-driven characteristic usually need electron/hole transport lay-ers to extract carriers.However,these devices with transport layer structure are prone to result in a poor perovskite/transport layer interface,which restricts the performance and stability of the device.To solve this problem,this work reports a novel device structure in which perovskite nanowires are in-situ prepared on PbI2,which serves as both a reaction raw material and efficient carrier extraction layer.By optimizing the thickness of PbI2,nanowire growth time,and ion exchange time,a self-driven photodetector with an ITO/PbI2/CsPbBr3/carbon structure is constructed.The optimized device achieves excellent perfor-mance with the responsivity of 0.33 A/W,the detectivity of as high as 3.52 × 1013 Jones.Furthermore,the device can detect the light with its optical power lowered to 0.1 nW/cm2.This research provides a new method for preparing perovskite nano/micro devices with simple structure but excellent performance.