Self-bleaching mechanism of electrochromic WO3 films

Ji-Guang Zhang; David K. Benson; C. Ed Tracy; John D. Webb; Satyen K. Deb

doi:10.1117/12.161951

22 October 1993 Self-bleaching mechanism of electrochromic WO3 films

Ji-Guang Zhang, David K. Benson, C. Ed Tracy, John D. Webb, Satyen K. Deb

Proceedings Volume 2017, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XII; (1993) https://doi.org/10.1117/12.161951
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Ji-Guang Zhang, David K. Benson, C. Ed Tracy, John D. Webb, and Satyen K. Deb "Self-bleaching mechanism of electrochromic WO3 films", Proc. SPIE 2017, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XII, (22 October 1993); https://doi.org/10.1117/12.161951

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