XPS Study in Electrochromic Process of Zn-doped NiO and Zndoped WO3 Thin Films Prepared by Spin Coating Method
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Abstract
Variation in oxidation states of Ni, W and O in electrochromic process of Zn-doped NiO and Zn-doped WO3 sol-gel derived thin films deposited by spin coating technique were extensively investigated by mean of X-ray photoelectron spectroscopy. The starting precursors for NiO and WO3 thin film deposition were prepared from nickel acetate tetrahydrate and tungsten powder dissolved in hydrogen peroxide meanwhile Zn dopant was started from zinc acetate dehydrate. X-ray photoelectron spectroscopy measurement was conducted on colored and bleached states of electrochromic process of both films. The corresponding results exhibited the significant variations of oxidation states and compositions of Ni ion, W ion and O were observed and were in good agreement with proposed chemical reactions during electrochromic process. The role of Zn dopant on electrochromic performance of both NiO and WO3 films was also investigated
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