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All-Solution-Processed Reduced Graphene Oxide Flexible Photodetectors for Use in Low-Light Environments | IEEE Journals & Magazine | IEEE Xplore

All-Solution-Processed Reduced Graphene Oxide Flexible Photodetectors for Use in Low-Light Environments


Abstract:

All-solution-processed reduced graphene oxide (rGO)-based flexible photodetectors (PDs) with asymmetric electrode structures of Ag nanowires (NWs) — Cu NWs are demonstrat...Show More

Abstract:

All-solution-processed reduced graphene oxide (rGO)-based flexible photodetectors (PDs) with asymmetric electrode structures of Ag nanowires (NWs) — Cu NWs are demonstrated for stable photodetection in weak-light environments. At first, we aimed to optimize the fabrication parameters of rGO layers for minimum roughness and high uniformity according to the field emission scanning electron microscope (FESEM) images; the average absorbance of optimal rGO layers is \sim 17.4% from 400 to 1600 nm. Additionally, compared to Ag NWs — Ag NWs and Cu NWs — Cu NWs electrodes, rGO PDs with Ag NWs—Cu NWs asymmetric electrodes showed a higher photocurrent-to-dark-current ratio (PDCR) ( \sim 6), which was due to the improved carrier transport with using Ag and Cu as cathodes and anodes. Furthermore, the highest photoresponsivity (5.5 mA/W) and detectivity ( D^{\ast} ) ( \sim {1}\times {10}^{{9}} cm Hz ^{{{1}/{2}}} /W) of rGO PDs with Ag NWs — Cu NWs electrodes have been measured and evaluated at 8 V bias. This work demonstrates the significant potential of all-solution processed rGO-based flexible PDs for high-performance and low-cost photosensing applications.
Published in: IEEE Electron Device Letters ( Volume: 44, Issue: 6, June 2023)
Page(s): 999 - 1002
Date of Publication: 18 April 2023

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