期刊
PHYSICA B-CONDENSED MATTER
卷 406, 期 8, 页码 1429-1435出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2011.01.043
关键词
TiO2; Optical properties; Grain boundary; Mechanical stress; Exchange interaction
资金
- University Grants Commission (UGC), the Government of India
- Council for Scientific and Industrial Research (CSIR), the Government of India
A non-linear variation of bandgap energy with Co doping is observed in sputter deposited Co-doped TiO2 thin films. This peculiar behavior is explained on the basis of mechanical stress in the films together with spin polarization due to s,p-d exchange interaction between the localized Co 3d electrons and delocalized electrons. Quantitative analyses of mechanical stress and grain boundary barrier potential due to spin polarization are performed from the below bandgap absorption tail. Furthermore, anomalous variations in both the refractive indices and extinction coefficients with Co doping are noted and are explained on the basis of ab-initio calculations based on density functional theory. (C) 2011 Elsevier B.V. All rights reserved.
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