Characterization And Performances Of WO3 Anodic Films In Electrochromic Devices

Pierre Delichere; Polycarpos Falaras; Anne Hugot-Le Goff

doi:10.1117/12.949908

6 March 1989 Characterization And Performances Of WO₃ Anodic Films In Electrochromic Devices

Pierre Delichere, Polycarpos Falaras, Anne Hugot-Le Goff

Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989) https://doi.org/10.1117/12.949908
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Anodic oxydation of tungsten in sulfuric solutions gives thin films with the uncommon hexagonal structure. When the films have grown at low voltages, the hexagonal channels are distorted with a lack of long-distance order. These films present very interesting electrochromic properties, over all when the coloration is done in an organic medium with insertion of Li⁺. The coloration absorption band is then centered in the visible wavelengths range. The optical indices in the bleached and colored states are obtained by a sophisticated statistical method of reflectance curves fitting. The kinetics of coloration/bleaching are studied by Multichannel Optical Analysis (OMA), and the lattice perturbations created by the insertion are followed by Raman spectroscopy. The electrical and optical reversibilities are perfect after more than 2x10⁶ coloration/ bleaching cycles and, in reason of the position of the coloration band in the visible wavelengths range, the coloration yield is high.

Citation Download Citation

Pierre Delichere, Polycarpos Falaras, and Anne Hugot-Le Goff "Characterization And Performances Of WO₃ Anodic Films In Electrochromic Devices", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); https://doi.org/10.1117/12.949908

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