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Proceedings Paper

Self-bleaching mechanism of electrochromic WO3 films
Author(s): Ji-Guang Zhang; David K. Benson; C. Ed Tracy; John D. Webb; Satyen K. Deb
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Paper Abstract

We report the first investigation of the self-bleaching behavior of electrochemically colored WO3 films. These films exhibit accelerated self-bleaching behavior over an 8-hour period when exposed to ambient air and show negligible or limited transmittance changes in other environments. The rate of self-bleaching in these films also depends on their preparation conditions, the electrolytes used in the coloring process, and film thickness and roughness. Self-bleaching in a WO3 film colored by lithium ions can be attributed mainly to the reaction between Li+ ions and water vapor, but self-bleaching in WO3 films colored by protons may be mainly due to the reaction between H+ and oxygen. The fast self-bleaching of the films in their early stages is dominated by the reaction of surface Li+ or H+ ions which are in direct contact with the reactive gases. The rate of self-bleaching increases with increasing film surface roughness but decreases with film thickness. The latter stages of self-bleaching exhibit a slower transmittance increase and are limited by diffusion of the reaction species.

Paper Details

Date Published: 22 October 1993
PDF: 9 pages
Proc. SPIE 2017, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XII, (22 October 1993); doi: 10.1117/12.161951
Show Author Affiliations
Ji-Guang Zhang, National Renewable Energy Lab. (United States)
David K. Benson, National Renewable Energy Lab. (United States)
C. Ed Tracy, National Renewable Energy Lab. (United States)
John D. Webb, National Renewable Energy Lab. (United States)
Satyen K. Deb, National Renewable Energy Lab. (United States)


Published in SPIE Proceedings Vol. 2017:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XII
Carl M. Lampert, Editor(s)

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