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Proceedings Paper

Structural and physical properties of electrochromic WO3 films prepared by CVD or thermal vaporization
Author(s): Albert Donnadieu; Mohammed Regragui; Bernard Ducourant; Robert Fourcade; Odile Bohnke
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Paper Abstract

Optical, electrical, and structural properties of electrochromic, amorphous, or polycrystalline WO3 thin films prepared by thermal vaporization or chemical vapor deposition (CVD) have been studied for samples in colored and bleached states. During the electrical coloration process, a shift of the absorption peak toward higher energies and an increase in the conductivity were observed for all samples. In the same time for the polycrystalline samples a structural change from monoclinic to cubic structure appeared and an increase in the reflectivity in the infrared wavelength range. The crystal structure of colored films changed back to the initial state when the films were electrically bleached, however, the optical and electrical properties were not absolutely reversible. It is possible that a fraction of hydrogen cations still remained inside bleached films and did not contribute to the coloration. An x ray diffraction study during the oxidation in air of a colored sample as a function of time indicates the possibility of following the kinetics of the electrochromic process from the shift of the XRD peaks.

Paper Details

Date Published: 25 November 1992
PDF: 11 pages
Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); doi: 10.1117/12.130543
Show Author Affiliations
Albert Donnadieu, Univ. de Montpellier II (France)
Mohammed Regragui, Univ. de Montpellier II (France)
Bernard Ducourant, Univ. de Montpellier II (France)
Robert Fourcade, Univ. de Montpellier II (France)
Odile Bohnke, Univ. de Franche-Comte (France)

Published in SPIE Proceedings Vol. 1728:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows
Anne Hugot-Le Goff; Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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