Chemical solutions consisting of NiO/ZnO p-n heterojunction nanowires (NWs) decorated with Pd nanoparticles on a glass substrate were used to fabricate an ultraviolet (UV)/visible photodetector. The photodetector was composed of ZnO hexagonal wurtzite and NiO cubic crystalline structures. A few NiO nanograins were found to epitaxially grow on the ZnO NW surface. The current-voltage curve for the photodetector exhibited rectification in the dark and under green and blue light-emitting diode (LED) illumination, whereas an approximately linear current-voltage curve was found under UV LED illumination. The Igreen/Idark, Iblue/Idark, and IUV/Idark ratios for the photodetector were 91.4, 403.2, and 1.25 × 105, respectively. Multilayer structures of the photodetector are sensitive toward the UV and visible bands.
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