Fabrication and characterization of a VO2: PVP/PSi/ and n-Si heterojunction for photodetector applications

Abstract

Vanadium dioxide nanoparticles (VO2) NPs have been demonstrated to create a thin film based for photodetectors which are controlled by size, shape, and morphology of materials in nanoscale by using hydrothermal method. Analyses from XRD, AFM and FT-IR showed that crystallite size = 12.92 nm, particle size = 16 nm, root mean-square of roughness = 21.3 respectively as well as, the transmittance reaches 96%. The results agree with optical properties where energy gap of samples = 1.36. The proposed results, for the Ag/VO2/PSi/n-Si/Ag heterojunction photo-detector are considerably better than other photodetectors. Responsivity of detector 0.9A/W at 915 nm and maximum value of detectivity D* 3.3 × 1012 W-1. cm. Hz0.