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Compositional dependence of absorption coefficient and band-gap for Nb2O5-SiO2 mixture thin films

Sancho-Parramon, Jordi; Janicki, Vesna; Zorc, Hrvoje (2008) Compositional dependence of absorption coefficient and band-gap for Nb2O5-SiO2 mixture thin films. Thin Solid Films, 516 (16). pp. 5478-5482. ISSN 0040-6090

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The absorption coefficient of composite films consisting of niobia (Nb2O5) and silica (SiO2) mixtures is studied for photon energies around the band gap. The films were deposited by co-evaporation and their composition was varied by changing the ratio of deposition rates of the two materials. Both, as-deposited and thermally annealed films were characterized by different techniques: the absorption coefficient was determined by spectrophotometric measurements and the structural properties were investigated using infrared spectroscopy, transmission electron microscopy and X-ray diffraction. The correlation between the variations of absorption properties and film composition and structure is established. The absorption coefficients determined experimentally are compared with the results derived from effective medium theories in order to evaluate the suitability of these theories for the studied composites.

Item Type: Article
Uncontrolled Keywords: absorption coefficient, composite thin films, effective medium theory, optical coatings
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Laser and Atomic Research and Development
Project titleProject leaderProject codeProject type
Optička svojstva nanostrukturnih slojeva[119546] Hrvoje Zorc098-0000000-3191MZOS
Depositing User: Vesna Janicki
Date Deposited: 10 Nov 2014 22:55
DOI: 10.1016/j.tsf.2007.07.028

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