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Proceedings Paper

Electrochromic Materials For Controlled Radiant Energy Transfer In Buildings
Author(s): Ronald B. Goldner; R. David Rauh
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Paper Abstract

Windows and building envelopes with an externally variable light transmission can be used to reduce significantly heating and cooling loads. Thin film, large area electrochromic structures are conceptualized which would permit reversible aperture control through applica-tion of small dc electrical currents. The structures have the generalized geometry TEC/EC1/FIC/EC2/TEC, where TEC is a thin transparent electrical conductor, EC1. and EC2 are complementary electrochromic layers, and FIC is a fast ion conductor. Measurements of the optical properties of the polycrystalline electrochromic oxide HxWO3 show large increases in reflectivity on increasing x, an effect not pronounced in the more frequently investigated amorphous material. The variation of the optical constants with x are used to demonstrate the dominance of free electron scattering in determining the optical properties. It is therefore concluded that electrochromic windows based on polycrystalline electrochromic layers may be operated in a reflectivity mode, which has several important advantages over variable absorption operation.

Paper Details

Date Published: 1 December 1983
PDF: 7 pages
Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); doi: 10.1117/12.936298
Show Author Affiliations
Ronald B. Goldner, Tufts University (United States)
R. David Rauh, EIC Laboratories, Inc. (United States)


Published in SPIE Proceedings Vol. 0428:
Optical Materials and Process Technology for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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