Optical properties of crystalline tungsten oxide

Michael G. Hutchins; A. John Topping; N. S. Butt; Dawn Jeffrey; Ian D. Brotherston; Paul E. Y. Milne; Jose M. Gallego; John R. Owen

doi:10.1117/12.406483

13 November 2000 Optical properties of crystalline tungsten oxide

Michael G. Hutchins, A. John Topping, N. S. Butt, Dawn Jeffrey, Ian D. Brotherston, Paul E. Y. Milne, Jose M. Gallego, John R. Owen

Author Affiliations +

Proceedings Volume 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites; (2000) https://doi.org/10.1117/12.406483
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

While designing a thermal control device based upon crystalline tungsten oxide it is vital to have knowledge of both n, the real part of the refractive index and k, the complex part. With this knowledge it is possible to predict the performance of an electrochromic device at different wavelengths of radiation. We performed a series of experiments on crystalline samples of tungsten oxide where both n and k were carefully determined from spectral reflectance and transmittance measurements after set amounts of charge were inserted electrochemically, thus reducing the tungsten oxide. The trends for n and k are different, which has implementations for device performance and design. We also investigated the effect of deposition temperature on the optical properties of crystalline tungsten oxied. This has implications for both the substrate that may be u sed in a device and the construction of the device. The final data we shall present are some electromechanical studies of insertion into crystalline tungsten oxide flake samples and powder samples. The flakes and powder are deposited in a similar way to a graphite paste electrodes used in Li ion battery studies. This is a possible route to a flexible eleectrochromic device based upon crystalline tungsten oxide.

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Michael G. Hutchins, A. John Topping, N. S. Butt, Dawn Jeffrey, Ian D. Brotherston, Paul E. Y. Milne, Jose M. Gallego, and John R. Owen "Optical properties of crystalline tungsten oxide", Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000); https://doi.org/10.1117/12.406483

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KEYWORDS

Oxides

Tungsten

Electrodes

Crystals

Reflectivity

Silicon

Composites

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