Amorphous Tungsten Oxide Electrochromic Coatings for Solar Windows

D. K. Benson; C. E. Tracy

doi:10.1117/12.966287

2 December 1985 Amorphous Tungsten Oxide Electrochromic Coatings for Solar Windows

D. K. Benson, C. E. Tracy

Proceedings Volume 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV; (1985) https://doi.org/10.1117/12.966287
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

Multilayer, solid-state electrochromic coatings based on "amorphous" tungsten oxide (a-W03) are being evaluated for control of solar gain through windows. This paper summarizes recent progress at SERI in this effort. A typical electrochromic coating consists of indium-tin oxide (520 nm), a-W0₃ (410 nm), MgF, (170 nm) and gold (15 nm) all applied by vacuum deposition. Transmission electron diffraction of the a-WO₃ shows a very fine structure with short range order and an ill-defined grain structure on the order of 8 nm diameter. Optical measurements show two electrochromically active absorption bands in the coating, at least one of which can be attributed to small polaron absorption quite similar to that observed in crystalline WO₃ at low temperatures. Methods were developed for depositing electrochromic a-W0₃ by plasma enhanced, chemical vapor deposition. Apparatus for testing the cyclic durability of solid state electrochromic coatings has been designed and constructed.

Citation Download Citation

D. K. Benson and C. E. Tracy "Amorphous Tungsten Oxide Electrochromic Coatings for Solar Windows", Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); https://doi.org/10.1117/12.966287

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