2 December 1985 Amorphous Tungsten Oxide Electrochromic Coatings for Solar Windows
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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.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. K. Benson, D. K. Benson, C. E. Tracy, 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); doi: 10.1117/12.966287; https://doi.org/10.1117/12.966287

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