Self-Powered Photodetector Based on Ag/CH 3 NH 3 PbI 3 /C Asymmetric Dual-Terminal Device.

CH 3 NH 3 PbI 3 is capable of exhibiting a superior photoresponse to visible light, but its self-powered devices are typically formed through p - n junctions. In this study, we fabricated a Ag/CH 3 NH 3 PbI 3 /C dual-terminal asymmetric electrode device using a single CH 3 NH 3 PbI 3 perovskite micro/nanowire, enabling both the photoresponse and self-powered characteristics of CH 3 NH 3 PbI 3 to visible light. Compared with traditional p - n junction devices, this simple device demonstrates enhanced interface photovoltaic effects by optimizing the combination of the Ag electrode with CH 3 NH 3 PbI 3 , resulting in superior self-powered characteristics. Under low bias voltage, the device achieves a significant on/off ratio of 10 3 , with superior sensitivity and responsivity as well as a maximum rectification ratio of about 12. The photogenerated voltage and current reach approximately 0.8 V and 2 nA, respectively. This simple, compact, and self-powered asymmetric device exhibits great potential for applications in self-powered optoelectronics and wearable devices. This research provides a promising approach for recognizing and utilizing surface state effects in single nanoscale structures.