Optical absorption in lithiated tungsten oxide thin ﬁlms: Experiment and theory
2007 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 102, no 8, 083538- p.Article in journal (Refereed) Published
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 300-2500 nm 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 W6+, W5+, and W4+ sites. The variation of the peak strength with lithium concentration is consistent with an extended site-saturation theory.
Place, publisher, year, edition, pages
2007. Vol. 102, no 8, 083538- p.
amorphous state, electrochromism, infrared spectra, lithium compounds, sputter deposition, thin films, tungsten compounds, ultraviolet spectra, visible spectra
Condensed Matter Physics Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-14570DOI: 10.1063/1.2800838ISI: 000250589300055OAI: oai:DiVA.org:uu-14570DiVA: diva2:42341