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Proceedings Paper

Ta2O5 electrolyte films and solid-state EC cells
Author(s): Michihiko Kitao; H. Akram; H. Machida; Kazuo Urabe; S. Yamada
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Paper Abstract

Solid-state electrochromic (EC) half-cells (ITO/EC/Ta2O5/ITO) have been fabricated, where the EC layer is WO3 or NiO film. Each layer was prepared by rf sputtering in an atmosphere of Ar-O2 mixture. The conduction mechanism in Ta2O5 electrolyte films was discussed from the measurement of ac conductivity. Both ionic and electronic conductions were found in the Ta2O5 films which were prepared in the oxygen content region less than 20%. In order to obtain pure ionic conduction in the Ta2O5 electrolyte films, they should be prepared in Ar-O2 mixture with the oxygen content region more than 20%. Coloration efficiency (42 cm2/C) of the half-cells with WO3 were a little smaller than that (60 cm2/C) of corresponding cells with liquid electrolyte. On the other hand, cells with NiO indicated only a low coloration efficiency (about 8 cm2/C). When Ta2O5 film was prepared in the atmosphere of Ar-O2 and moisture, the coloration efficiency increased a little. In the self-bleaching test under the open- circuit condition, the optical density (OD) of the cell with NiO film fell off, down to a half of the initial OD at 50 hours after stopping the coloration.

Paper Details

Date Published: 25 November 1992
PDF: 8 pages
Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); doi: 10.1117/12.130552
Show Author Affiliations
Michihiko Kitao, Shizuoka Univ. (Japan)
H. Akram, Shizuoka Univ. (Japan)
H. Machida, Shizuoka Univ. (Japan)
Kazuo Urabe, Shizuoka Univ. (Japan)
S. Yamada, Shizuoka Institute of Science and Technology (Japan)

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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