A dual-band photodetector based on ZnO nanowires decorated with Au nanoparticles synthesized on a glass substrate

Abstract

ZnO nanowires (NWs) decorated with Au nanoparticles (NPs) of various grain sizes are fabricated into a dual-band photodetector on a glass substrate. The morphology, crystallinity, oxygen vacancy density, optical properties, and responsivity of the ZnO NWs are evaluated using scanning electron microscopy, X-ray diffraction, and photoluminescence spectroscopy. The ZnO NWs decorated with Au NPs had a quantum efficiency of ∼80.82%, an ultraviolet (UV)-to-visible rejection ratio of 3.41 × 10², and UV and green region bands. Au NPs can absorb green light and produce a strong electric field via the localized surface plasmon resonance effect.