Ta2O5 electrolyte films and solid-state EC cells

Michihiko Kitao; H. Akram; H. Machida; Kazuo Urabe; S. Yamada

doi:10.1117/12.130552

25 November 1992 Ta₂O₅ electrolyte films and solid-state EC cells

Michihiko Kitao, H. Akram, H. Machida, Kazuo Urabe, S. Yamada

Proceedings Volume 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows; (1992) https://doi.org/10.1117/12.130552
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

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.

Citation Download Citation

Michihiko Kitao, H. Akram, H. Machida, Kazuo Urabe, and S. Yamada "Ta₂O₅ electrolyte films and solid-state EC cells", Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); https://doi.org/10.1117/12.130552

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