In-situ spectroscopic studies of electrochromic tungsten oxide films

Nilgun Ozer; Muharrem Demirbas; Secuk Ozyurt

doi:10.1117/12.448246

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13 November 2001 In-situ spectroscopic studies of electrochromic tungsten oxide films

Nilgun Ozer, Muharrem Demirbas, Secuk Ozyurt

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Proceedings Volume 4458, Solar and Switching Materials; (2001) https://doi.org/10.1117/12.448246
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Tungsten oxide thin films were prepared using an ethanolic solution of tungsten hexachloride (WCl₆) by sol-gel spin coating. The films were spin coated on indium tin oxide (ITO) coated glass substrate at temperatures in the range of 100 to 450 degree(s)C. The films were characterized by x-ray diffractometry (XRD), scanning electron microscopy (SEM) UV- visible spectroscopy and cyclic voltammetry (CV). XRD showed that they had a polycrystalline WO₃ structure for heat treatment temperatures at above 350 degree(s)C. The SEM examinations showed that the surface texture was very uniform and homogeneous. In situ electrochemical reduction of WO₃/ITO (2M HCl) produced a blue color in less than a second. Coloration efficiency (CE) was found to be 21 cm²/mC. In situ spectroscopic investigations showed that these films could be used as a working electrode in electrochromic devices.

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Nilgun Ozer, Muharrem Demirbas, and Secuk Ozyurt "In-situ spectroscopic studies of electrochromic tungsten oxide films", Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); https://doi.org/10.1117/12.448246

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