Infrared optical properties of sputtered WO3

Anna-Lena Larsson; Gunnar A. Niklasson; Lars Stenmark

doi:10.1117/12.405306

25 October 2000 Infrared optical properties of sputtered WO₃

Anna-Lena Larsson, Gunnar A. Niklasson, Lars Stenmark

Proceedings Volume 4102, Inorganic Optical Materials II; (2000) https://doi.org/10.1117/12.405306
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Thin films of amorphous and crystalline tungsten trioxide were deposited onto glass covered with indium tin oxide, by reactive dc magnetron sputtering. The samples were intercalated with Li ions in 1M LiClO₄ in propylene carbonate. The infrared reflectance was measured ex-situ at wavelengths between 2 and 50 micrometers for Li_xWO₃ of different thickness, d, and at different Li/W ratios, x. The absorption bands (i.e. the dips in the reflectance spectra) of a thick amorphous film (d equals 1450 nm) get stronger up to the threshold value x equals 0.17. Above this value, the amplitude of the oscillations in the reflectance spectra decreases, which resembles the behavior of a thick crystalline film (d equals 1270 nm). The latter seems to have a lower threshold value, around x equals 0.08 and the spectra at large x are flatter than the ones for the amorphous film.

Citation Download Citation

Anna-Lena Larsson, Gunnar A. Niklasson, and Lars Stenmark "Infrared optical properties of sputtered WO₃", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); https://doi.org/10.1117/12.405306

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