Modeling the optical properties of WO₃ and WO₃-SiO₂ thin films

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Atıf İçin Kopyala

Saygin-Hinczewski D., Hinczewski M., SORAR İ., Tepehan F. Z., Tepehan G. G.

SOLAR ENERGY MATERIALS AND SOLAR CELLS, sa.8, ss.821-829, 2008 (SCI-Expanded)

• Yayın Türü: Makale / Tam Makale
• Basım Tarihi: 2008
• Doi Numarası: 10.1016/j.solmat.2008.01.021
• Dergi Adı: SOLAR ENERGY MATERIALS AND SOLAR CELLS
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Sayfa Sayıları: ss.821-829
• Hatay Mustafa Kemal Üniversitesi Adresli: Hayır

Özet

The optical properties and surface morphology of sol-gel spin coated WO3 and WO3-SiO2 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% SiO2 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.