Abstract
Self-powered ultraviolet (UV) photodetectors based on ZnO nanowires have attracted considerable interest due to low-cost and ease of fabrication. Effective strategies to enhance their photoresponse still remain challenging. Here we report a 4 × 4 matrix of self-powered ZnO UV photodetector system with optimized ZnO nanowire photoelectrode/electrolyte heterostructures. Modulating pH-dependent chemo-phototronic effect can regulate optoelectric and chemoelectric processes, resulting in significantly improved photodetection performance. The maximum photocurrent and photoresponsivity up to 290.02 μA and 4.74 × 10−2 A W−1 can be achieved by using NaOH aqueous electrolyte (pH 13), which have been enhanced by 2056% as compared with that of utilizing deionized water electrolyte (pH 7). The enhanced performance is related to the pH-dependent chemical reaction, Schottky-like barrier height and depletion region width modulation at ZnO/electrolyte interface. This work provides guidelines to fabricate high-performance self-powered photodetector system of using semiconductor/electrolyte heterostructures, pushing forward the advancement of high-sensitivity and low-cost photodetector array system.
Published Version
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