Optical properties of dilute hydrogen tungsten bronze thin films

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Abstract
Transmission and reflection spectra in the range of 0.5–4.1 eV have been obtained for HxWO3 polycrystalline thin films of 5‐nm mean grain size. The composition range x=0–0.16 has been investigated. The measurements were refined to give the absorption coefficient and other optical parameters versus photon energy. The data have been interpreted in terms of the interband transition model due to Green and Travlos [Philos. Mag. B 51, 501 (1985)]. It is noted that main gap changes because of changes in crystal structure, and there is a sensitivity of the main gap value to grain size which may have its origins in quantum confinement effects.