Temperature effect on structural and optical properties of V₂O₅ thin films prepared by spray pyrolysis technique

Abstract

In this work, the effect of substrate temperature on structural and optical properties of V2O5 thin films has been characterized by X-ray diffraction (XRD); SEM and transmission. The films mince has been prepared by Reactive Chemical Spraying technology in Liquid Phase (RCSLP) on glass substrates preheated at (350, 400, 450 and 500 °C). The X-ray diffraction analysis confirms that all layers are polycrystalline, and the preferred orientation of V2O5 is the (001) plane. The morphology of V2O5 thin films are porous nature and their particle’s shape is three-dimensional. The transmittance and absorbance of thin film were measured from which the optical constants (Energy gap, Refractive index, Absorption coefficient, Extinction coefficient and Optical dielectric constant) were determined.

Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study

“…The transition phase produces a change in the characteristics of the material which means, the characteristics of each phase seem to be separated from each other. As such, the substance is a tunable optic material [17]. The effective-medium theories (EMTs) for example; the Bruggeman formalism and the Looyenga mixing rule [15,16,18] were applied to estimate the permittivity of VO 2 nano-films approximately, within the IMT when insulating and metallic domains coexist.…”

“…Therefore, k (besides n) is mainly controlled by the electric field of the electromagnetic wave and its interaction with the solids. In addition, α is the absorption coefficient denoted by [17] as.…”