Self-Powered Photodetector Based on Ag/CH₃NH₃PbI₃/C Asymmetric Dual-Terminal Device

Abstract

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.

Element Regulation and Dimensional Engineering Co-Optimization of Perovskite Memristors for Synaptic Plasticity Applications

“…If the cation migration rate within the functional layer is rapid, the metal ions are reduced only upon reaching the inert electrode, which is the FTO. Consequently, the conductive filament extends from the inert electrode (FTO) toward the active electrode (Ag). − The inset of Figure c elucidates the underlying cause of this phenomenon. Under the stimulation of continuous positive pulses, silver ions will sink to the bottom electrode due to the repulsion of positive voltage, resulting in the accumulation of CFs.…”