Electrochromism in sol-gel deposited TiO2 films

John M. Bell; Joanna Barczynska; L. A. Evans; Kathleen A. MacDonald; J. Wang; David C. Green; Geoffrey B. Smith

doi:10.1117/12.185374

9 September 1994 Electrochromism in sol-gel deposited TiO₂ films

John M. Bell, Joanna Barczynska, L. A. Evans, Kathleen A. MacDonald, J. Wang, David C. Green, Geoffrey B. Smith

Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185374
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany

Abstract

Electrochromism is sol-gel deposited TiO₂ films and films containing TiO₂ and WO₃ has been observed. The films are deposited by dip-coating from a precursor containing titanium isopropoxide in ethanol or titanium propoxide in ethanol, and after deposition the films are heat treated to between 250 degree(s)C and 300 degree(s)C. The films do not show any signs of crystallinity. However substantial coloration is observed using Li⁺ ions in a non-aqueous electrolyte, both in pure TiO₂ films and in mixed metal oxide films (WO₃:TiO₂), although the voltage required to produce coloration is different in the two cases. Results will be presented detailing the optical switching and charge transport properties of the films during cyclic voltammetry. These results will be used to compare the performance of the TiO₂ films with other electrochromics. The TiO₂ and mixed metal films all color cathodically, and the colored state is a neutral greyish color for TiO₂, while the bleached state is transparent and colorless, Results on coloration efficiency and the stability under repeated electrochemical cycling will also be presented. The neutral color of the TiO₂ films and mixed-metal films means that electrochromic windows based on TiO₂ may have significant advantages over WO₃-based windows. A detailed analysis of the optical properties of the colored state of the films will be presented. The dynamics of coloration for these films is also under investigation, and preliminary results will be presented.

Citation Download Citation

John M. Bell, Joanna Barczynska, L. A. Evans, Kathleen A. MacDonald, J. Wang, David C. Green, and Geoffrey B. Smith "Electrochromism in sol-gel deposited TiO₂ films", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); https://doi.org/10.1117/12.185374

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