Temperature Dependent Optical Absorption In Electrochromic Tungsten And Molybdenum Oxides

J. S. E. M. Svensson; D. K. Benson; C. E. Tracy

doi:10.1117/12.949909

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6 March 1989 Temperature Dependent Optical Absorption In Electrochromic Tungsten And Molybdenum Oxides

J. S. E. M. Svensson, D. K. Benson, C. E. Tracy

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Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989) https://doi.org/10.1117/12.949909
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

The optical absorption in thin films of electrochromic oxides of tungsten and molybdenum has over the solar spectral range at temperatures from about 100 K to 365 K. The films were depos at room temperature by RF plasma enhanced chemical vapor deposition and then converted to th injection compounds Li_xWO₃ and Li_xMoO₃ by reaction with n-butyl lithium in a water-free an environment to duplicate their colored elctrochromic state. The optical absorption in the Li_xW0₃ films consists of a broad peak centered near 1.7 eV. The Absorption in the Li_xMo0₃ films consists of a broad band centered near 1.3 eV, a temperature dependent Urbach band edge near 3 eV plus a very broad tailing absorption connecting these two features. The optical absorption in these materials in interpreted in terms of a small polaron absorption process and temperature dependent structual disorder.

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J. S. E. M. Svensson, D. K. Benson, and C. E. Tracy "Temperature Dependent Optical Absorption In Electrochromic Tungsten And Molybdenum Oxides", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); https://doi.org/10.1117/12.949909

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