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

被引：17
|
作者：
Saygin-Hinczewski, D. [2 ]
Hinczewski, M. [3 ]
Sorar, I. [2 ]
Tepehan, F. Z. [2 ]
Tepehan, G. G. [1 ]
机构：
[1] Kadir Has Univ, Fac Arts & Sci, TR-34083 Istanbul, Turkey
[2] Istanbul Tech Univ, Dept Phys, TR-34469 Istanbul, Turkey
[3] TUBITAK Bosphorus Univ, Feza Gursey Res Inst, TR-34680 Istanbul, Turkey
来源：
SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2008年 / 92卷 / 08期
关键词：
sol-gel; WO3; WO3-SiO2; double Tauc-Lorentz model; Urbach tail; optical properties; surface morphology;
D O I：
10.1016/j.solmat.2008.01.021
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
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.
引用
收藏
页码：821 / 829
页数：9
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