Saygin-Hinczewski, DursenHinczewski, MichaelSorar, İdrisTepehan, Fatma ZehraTepehan, Galip Gültekin2019-06-272019-06-272008170927-02480927-0248https://hdl.handle.net/20.500.12469/1150https://doi.org/10.1016/j.solmat.2008.01.021The optical properties and surface morphology of sol-gel spin coated WO(3) and WO(3)-SiO(2) composite films annealed at 250 and 400 degrees C are investigated. For the purpose of extracting the optical parameters of the films a novel form for the dielectric function is introduced consisting of two Tauc-Lorentz oscillators and an Urbach tail component which is suited for amorphous multi-transition materials with substantial subgap absorption. The evolution of the refractive indices transmittances and band gaps with doping is marked by sizable shifts at 2.0-2.5% SiO(2) doping for the 250 degrees C films and 4.0-4.5% doping for the 400 degrees C films. In addition pronounced changes in the surface roughness of the films occur at these doping values. (c) 2008 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/openAccessSol-gelWO(3)WO(3)-SiO(2)Double Tauc-Lorentz modelUrbach tailOptical propertiesSurface morphologyArticle821829892WOS:00025735670000110.1016/j.solmat.2008.01.0212-s2.0-44149110098Q1Q1