Effect of solution molarity on the characteristics of vanadium pentoxide thin film |
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Authors: | Alaa A Akl |
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Institution: | Faculty of Science, Physics Department, El-Minia University, Egypt |
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Abstract: | Vanadium pentoxide (V2O5) thin films have been prepared by spray pyrolysis technique. The influence of solution molarity on the characteristics of the V2O5 has been investigated. X-ray diffraction analysis (XRD) showed that, the films deposited at ≥0.1 M were orthorhombic structure with a preferential orientation along 〈0 0 1〉 direction. Moreover, the crystallinity was improved by increasing solution molarity. The microstructure parameters have been evaluated by using a single order Voigt profile method. The optical band gaps, determined by using Tauc plot, have been found to be 2.50 ± 0.02 and 2.33 ± 0.02 eV for the direct and indirect allowed transition, respectively. Also the complex optical constants for the wavelength range 300-2500 nm are reported. At room temperature, the dark conductivity as a function of solution molarity showed the range of 5.74 × 10−2 ± 0.03 to 3.36 × 10−1 ± 0.02 Ω−1 cm−1. While at high temperature, the behaviour of electrical conductivity dominated by grain boundaries. The values of activation energy and potential barrier height were 0.156 ± 0.011 and 0.263 ± 0.012 eV, respectively. |
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Keywords: | Vanadium pentoxide Thin films Spray pyrolysis |
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