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Proceedings Paper

Characterization And Performances Of WO3 Anodic Films In Electrochromic Devices
Author(s): Pierre Delichere; Polycarpos Falaras; Anne Hugot-Le Goff
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Paper 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.

Paper Details

Date Published: 6 March 1989
PDF: 7 pages
Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); doi: 10.1117/12.949908
Show Author Affiliations
Pierre Delichere, Physique des Liquides et Eletrochimie (France)
Polycarpos Falaras, Physique des Liquides et Eletrochimie (France)
Anne Hugot-Le Goff, Physique des Liquides et Eletrochimie (France)

Published in SPIE Proceedings Vol. 1016:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII
Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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