Zinc Oxide Nanorods/Reduced Graphene Oxide for Schottky Junction Ultraviolet Photodetector Application

Abstract

Hybrid Ultraviolet photodetector (UVPD) was fabricated by depositing reduced graphene oxide on zinc oxide nanorods (ZnO NRs) array-coated FTO glass. Structural and optical properties of ZnO NRs were studied using TEM, SEM, XRD and UV–Vis spectroscopy. Graphene oxide (GO) sheets were synthesized from graphite powder using the modified Hummer’s method. rGO films were obtained after illuminating the GO in UV radiation. The formation of rGO and GO films was studied using AFM surface topography and UV–Vis spectroscopy. External quantum efficiency (EQE), responsivity and transient response of rGO/ZnO NR-based UV photodetector were studied in detail. The photodetector device shows very high EQE ([Formula: see text]45 257%) and responsivity (R[Formula: see text]130 A/W).