Vanadium Pentoxide and Bismuth Oxide Thin Films Deposition on PSi for Application in Solar Cells

Abstract

In this study, V₂O₅ and Bi₂O₃ nanoparticles were synthesized using a hydrolysis method and simple chemical method respectively. PSi was prepared by electrochemical etching method. The samples were characterized by X-ray diffraction (XRD), Atomic force microscopy (AFM), Scanning electron microscope (SEM), ultra violet-visible (UV–Vis), Fourier transform infrared (FTIR) and PL emission. From X-ray pattern of PSi, it observed a strong peak of (PSi) at 2θ = 69.04 and 69.24 is confirming the mono-crystalline structure of the Si layer. from AFM of freshly prepared porous silicon found the surface form like hillocks with un-uniform different heights surface. with RMS roughness (Sq): 3.62 nm, Mean roughness (Sa): 2.43 nm and Maximum height (Sz): 61.39. it was a single peak emission at 647 nm was due to PSi nano-crystalline. FTIR spectrum identified the most important functional groups involved in the formation of PSi. The mean crystalline size of V₂O₅ and Bi₂O₃ nanoparticles was found to be around (19.70 and 28.57) nm. The morphology of the synthesized V₂O₅. and Bi₂O₃ NPs was observed exhibits lamellar structure with diameters 68.08 nm and 32.18 nm respectively. FTIR spectrum identified the most important functional groups involved in the formation of V₂O₅ and Bi₂O₃. The optical band gap of V₂O₅-NPs was found to be 3 eV and Bi₂O₃ NPs was (4.52 eV). The efficiency of the fabricated solar cell was found to be 1.38% and filling factor 20.62%.