Amorphous tungsten oxide exhibits electrochromism when intercalated with protons, lithium, sodium, and other ions. Thin films of the material were prepared by dc magnetron sputtering and then electrochemically intercalated with lithium. The optical absorption in the wavelength range of was measured for a number of lithium concentrations. The optical absorption shows a maximum for lithium/tungsten ratios of 0.3–0.5. The optical spectra can be fitted by a superposition of three Gaussian peaks, representing the three possible electronic transitions between , , and sites. The variation of the peak strength with lithium concentration is consistent with an extended site-saturation theory.
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Research Article| October 25 2007
Optical absorption in lithiated tungsten oxide thin films: Experiment and theory
Jacob C. Jonsson;
Lars Berggren, Jacob C. Jonsson, Gunnar A. Niklasson; Optical absorption in lithiated tungsten oxide thin films: Experiment and theory. J. Appl. Phys. 15 October 2007; 102 (8): 083538. https://doi.org/10.1063/1.2800838
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