Physics

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Electrochromic Properties of Sol-gel NiO – based films
(2012) Atheer Yousef Saleh Abu-Yaqoub; Dr. Iyad Saadeddin; Prof. Hikmat Hilal
Abstract Electrochromic films of NiO, Ni1-xTixO (with Ti nominal concentration ranging from 0-30 %) and Ni1-xTix-ySnyO (with Sn nominal concentration ranging from 1-5 %). Films of one and double imertion have been prepared by the sol-gel route using dip coating technique onto fluorine-doped tin oxide-coated glass substrates (FTO/glass). Characteristics of different films were studied in a comparative manner. Photoluminescence spectra, electrochromic behavior, cyclic voltammetry, transmittance spectrum, XRD and SEM have been investigated. Our results indicate that electrochromic and other characteristics of the NiO can be enhanced by addition of Ti and Sn within NiO at certain concentrations.Mechanisms of coloration and morphology transformation of the layer during cycling in 0.5 M KOH electrolyte were discussed in terms of an activation and degradation period. Calculation of cathodic charge (Qc), anodic charge (Qa), optical density and coloration efficiency, energy gap, thikness were made and discussed.