Self-powered (In,Ga)N-nanowire-based photodetector with fast response speed for under-seawater detection

• DOI: 10.1364/oe.482370
• Publication Date: 2023-02-03T20:00:05Z
• Authors: Jianya Zhang; Min Jiang; Min Zhou; Wenxian Yang; Yukun Zhao; Shulong Lu
• Keywords: Response time

Due to the requirements of oceanography exploration and detection, self-powered photodetectors (PDs) with low-power consumption are essential for next-generation optoelectronic applications. In this work, we successfully demonstrate a photoelectrochemical (PEC) PD in seawater based on (In,Ga)N/GaN core-shell heterojunction nanowires. Compared those pure water, it is found that upward downward overshooting features current can be key reason contributing much faster response speed seawater. Thanks enhanced speed, rise time reduced more than 80%, fall remains only 30% by applying instead water. The factors generating these should instantaneous temperature gradient, carrier accumulation elimination semiconductor/electrolyte interfaces at moments light off. By analysis experimental results, Na+ Cl- ions proposed main affecting behavior seawater, which enhance conductivity accelerate oxidation-reduction reaction significantly. This work paves an effective way develop new PDs wide applications under-seawater detection communication.