Self-powered visible photodetector with fast-response speed and high stability based on vertical (In,Ga)N nanowires

Energy-saving photodetector (PD) with fast response speed is a key component of the next-generation photonic systems. In this work, self-powered photoelectrochemical (PEC) PD based on vertical (In,Ga)N nanowires (NWs) has been proposed and demonstrated successfully. With deionized water solution, the (In,Ga)N NWs are stable and the PEC PD is eco-friendly. The PEC PD has a good stability in terms of good on/off switching behaviors after continuously working for a few hours. The PD exhibits a high sensitivity under very low light illumination intensity of 6.4 μW/cm 2 . A fast rise/fall time of ∼54/55 ms with good symmetry can also be achieved. Moreover, the NW core-shell structure is proposed to provide an additional way for electron-hole carrier transport, which could play a key role in accelerating the response speed. This work paves a way to develop high-performance PEC PDs for the wide applications in wireless visible photodetection and communication.