Optical properties of copper modified sol-gel SiO2 thin films

被引：7
|
作者：
Vives, Serge [1 ]
Meunier, Cathy [2 ]
机构：
[1] Univ Franche Comte, FEMTO ST, F-90000 Belfort, France
[2] Univ Franche Comte, Nanomed Lab, F-25211 Montbeliard, France
来源：
MATERIALS LETTERS | 2013年 / 91卷
关键词：
Sol-gel; UV-visible absorption; Thin films; Time Dependent Density Functional Theory (TD-DFT); DEPENDENCE; BAND;
D O I：
10.1016/j.matlet.2012.09.081
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Copper modified SiO2 thin films have been synthetized by sol-gel/dip coating process and annealed at 450 degrees C. The presence of crystallized CuO is only detected for the highest level of introduced Cu [Cu/(Cu+Si)=0.2]. UV-Visible absorption edge increases with the copper content in the film. Optical gap (E-g) and Urbach energy (E-u) extracted from the UV-Visible absorption curves evidence the large effect of the presence of copper species on silica optical properties. The decrease of the optical gap agrees with the lowering of the UV-Visible absorption peak energy calculated at the Time Dependent Density Functional Theory (TD-DFT) level for silica clusters without and with a copper atom. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：165 / 169
页数：5
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