Materials And Devices In Electrochromic Window Development

Stuart F. Cogan; Elizabeth J. Anderson; Timothy D. Plante; R. David Rauh

doi:10.1117/12.966284

2 December 1985 Materials And Devices In Electrochromic Window Development

Stuart F. Cogan, Elizabeth J. Anderson, Timothy D. Plante, R. David Rauh

Proceedings Volume 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV; (1985) https://doi.org/10.1117/12.966284
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

Windows with switchable electrochromic glazings are potentially useful for regulating solar input to building interiors. In this article, we describe the structure and operation of a proposed solid-state electrochromic glazing based on crystalline LixWO₃ (c-LiXWO₃) and a low coloration efficiency counter electrode material such as amorphous Nb₂O₅ (a-Nb₂O₅). The importance of reversibility in electrochromic glazing operation is emphasized, and optical switching experiments that demonstrate reversible lithium insertion/extraction in c-Li_xW0₃, a-Li_xWO₃, and a-Li_xNb₂O₅ are described. Additional optical switching experiments in tandem electrochromic cells comprised of c-Li_xWO₃/a-Nb₂O₅ and a-Li_xWO₃/a-Nb₂O₅ demonstrated the proposed design, indicating reversible optical switching over 500 and 200 complete cycles, respectively, without degradation. Optical data on the evolution of reflective and absorp-tive modulation in c-Li_xWO₃ are presented and solar attenuation results are used to demon-strate the advantage of using crystalline electrochromics to conserve daylighting during electrochromic window operation.

Citation Download Citation

Stuart F. Cogan, Elizabeth J. Anderson, Timothy D. Plante, and R. David Rauh "Materials And Devices In Electrochromic Window Development", Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); https://doi.org/10.1117/12.966284

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