A Self-Powered Transparent Photodetector Based on Detached Vertical (In,Ga)N Nanowires with 360° Omnidirectional Detection for Underwater Wireless Optical Communication

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Abstract
Underwater wireless optical communication (UWOC) is a wireless communication technology using visible light to transmit data in an underwater environment, which has wide applications. Based on lift-off (In,Ga)N nanowires, this work has proposed and successfully demonstrated a self-powered photoelectrochemical (PEC) photodetector (PD) with excellent transmissivity. The transparent functionality of the PD is critical for 360° omnidirectional underwater detection, which was realized by detaching the (In,Ga)N nanowires from the opaque epitaxial substrates to the indium tin oxide (ITO)/glass. It was also found that the insulating SiO2 layer can enhance the photocurrent by about 12 times. The core–shell structure of the nanowires is beneficial for generating carriers and contributing to the photocurrent. Furthermore, a communication system with ASCII code is set to demonstrate the PD detection in underwater communication. This work paves an effective way to develop 360° omnidirectional PDs for the wide applications in UWOC system and underwater photodetection.
Funding Information
  • National Key Research and Development Program of China (2018YFB0406900 and 2018YFB0406902)
  • Natural Science Foundation of Jiangsu Province (BK20180252)
  • Key Research and Development Program of Jiangsu Province (BE2018005)
  • Key Research Program of Frontier Sciences, CAS (ZDBS-LY-JSC034)
  • National Natural Science Foundation of China (61804163, 61875224 and 61827823)
  • Natural Science Foundation of Jiangxi Province (20192BBEL50033)
  • Research Program of Scientific Instrument and Equipment of CAS (YJKYYQ20200073)
  • Research Program of Scientific Instrument and Equipment of SINANO (Y8AAQ21001)
  • Vacuum Interconnected Nanotech Workstation (B2006)

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