Abstract
A poly (vinyl alcohol) matrix incorporating ZnO-GQD composite structures was used in a photodiode configuration as a novel kind of nanocomposite. The crystal structure and morphology of the composites were studied in depth. The electro-optical properties of the fabricated photodiodes using the composites were interpreted based on the intrinsic characteristics of the composites. The ZnO/PVA-based photodiode offers self-power with approximately high specific detectivity of 4.6 × 1010 Jones at zero bias. However, graphene quantum dots provided numerous advantages, particularly improving the response speed of the photodiode ZnO-GQDs/PVA dispossessed the ability due to introducing GQDs. A high-speed response (0.06 s, at least three times faster than ZnO/PVA photodiode) was recorded for ZnO-GQDs/PVA.
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