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Crystal Phase Effects in Electrochromic Wo3

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The electrochromic behavior of crystalline WO3 thin films of two different crystal structures was investigated. The films were deposited on ITO-coated Coming 7059 glass and transparent single crystal sapphire substrates by electron beam evaporation. The usual monoclinic crystal structure was obtained by post-annealing films deposited at low substrate temperatures. An alternative phase was generated by in-situ growth of crystalline films at high substrate temperatures. The reversible electrochemical insertion of Li was demonstrated by cyclic voltammetry. Optical switching was observed by comparing visible transmittance, visible reflectance, and infrared reflectance spectra of films before and after Li intercalation. The two film types assumed similar crystal structures upon lithiation. High infrared reflectance in the monoclinic phase was described well by an elementary free- electron plasma edge model. However, the high-Ts film exhibited significantly poorer reflectance in the infrared when lithiated.

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  1. EIC Laboratories, Norwood, MA, 02062, USA

    J. D. Klein & A. Yen

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  1. J. D. Klein
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  2. A. Yen
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Klein, J.D., Yen, A. Crystal Phase Effects in Electrochromic Wo3. MRS Online Proceedings Library 293, 389–394 (1992). https://doi.org/10.1557/PROC-293-389

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