Preparation of V2O5 Thin Films Using Vanadyl Heteroligand Complexes and Their Electrochromic Properties

Abstract

Microstructural features, phase composition, and eletrochromic properties of V₂O₅ film formed by spin-coating using vanadyl alkoxoacetylacetonate as a precursor have been studied. The obtained material possesses a significant amount of V⁴⁺ ions, which is indicated both by the presence of the corresponding modes in the Raman spectra and the presence of the V₇O₁₆ phase. As a result, the material exhibits anodic electrochromism; it colors upon oxidation, changing color from pale blue to a much less transparent orange-yellow. The optical contrast can reach 30% at a wavelength of 400 nm, and the coloration efficiency is 65.26 cm²/C. The results of the study clearly demonstrate the promising application of materials based on V₂O₅, obtained using heteroligand hydrolytically active vanadyl complexes, as functional components of devices that provide a change in optical properties when an electrical voltage is applied.