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Proceedings Paper

In-situ spectroscopic studies of electrochromic tungsten oxide films
Author(s): Nilgun Ozer; Muharrem Demirbas; Secuk Ozyurt
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Paper 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.

Paper Details

Date Published: 13 November 2001
PDF: 6 pages
Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); doi: 10.1117/12.448246
Show Author Affiliations
Nilgun Ozer, Univ. of California/Berkeley (United States)
Muharrem Demirbas, TUBITAK-National Research Institute of Electronics and Cryptology (Turkey)
Secuk Ozyurt, TUBITAK-National Research Institute of Electronics and Cryptology (United States)

Published in SPIE Proceedings Vol. 4458:
Solar and Switching Materials
Carl M. Lampert; Carl M. Lampert; Claes-Goran Granqvist; Claes-Goeran Granqvist; Keith L. Lewis; Keith L. Lewis, Editor(s)

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