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Proceedings Paper

Fourier transform infrared study of tungsten oxide thin films and their coloration by lithium
Author(s): Mark S. Burdis; John R. Siddle; Shona Taylor
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Paper Abstract

The technique of Fourier Transform Infrared (FTIR) Spectroscopy has been used to study tungsten oxide (WO3) thin films. The effect of coloration with lithium has been investigated and leads to the conclusion that the coloration mechanism for lithium in WO3 requires a structural reorganization induced by the co-insertion of the lithium ion and an electron. This can produce a valence change in one of the tungsten atoms, necessary for absorption of radiation by the inter-valence charge transfer mechanism. There is a clear redistribution of the infra-red active modes when the material is colored with lithium or sodium, and this can be used to characterize the film to some extent. Furthermore, the FTIR spectral changes in anomalously coloring WO3 as reported previously, have been investigated. No change is seen in the FTIR spectra until the onset of the electrochromic coloration, indicating the lithium ion initially occupies a different site or performs a different role to that seen in normal coloration. This evidence, when combined with other information, leads to the conclusion that the lithium may react with excess oxygen in the WO3 forming a second chemical phase, perhaps of lithium oxide.

Paper Details

Date Published: 9 September 1994
PDF: 13 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185380
Show Author Affiliations
Mark S. Burdis, Pilkington Technology Management Ltd. (United Kingdom)
John R. Siddle, Pilkington Technology Management Ltd. (United Kingdom)
Shona Taylor, Pilkington Technology Management Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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