Structural and physical properties of electrochromic WO3 films prepared by CVD or thermal vaporization

Albert Donnadieu; Mohammed Regragui; Bernard Ducourant; Robert Fourcade; Odile Bohnke

doi:10.1117/12.130543

25 November 1992 Structural and physical properties of electrochromic WO₃ films prepared by CVD or thermal vaporization

Albert Donnadieu, Mohammed Regragui, Bernard Ducourant, Robert Fourcade, Odile Bohnke

Proceedings Volume 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows; (1992) https://doi.org/10.1117/12.130543
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

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.

Citation Download Citation

Albert Donnadieu, Mohammed Regragui, Bernard Ducourant, Robert Fourcade, and Odile Bohnke "Structural and physical properties of electrochromic WO₃ films prepared by CVD or thermal vaporization", Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); https://doi.org/10.1117/12.130543

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