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Structural characterizations and electronic properties of Ti-doped SnO2(110) surface: a first-principles study
Wei Lin1, Yong-Fan Zhang, Yi Li
1Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, People's Republic of China.
The Journal of Chemical Physics
|February 14, 2006
Summary
Titanium (Ti) doping of tin dioxide (SnO2) surfaces favors substitution at the top layer, significantly altering electronic structures and surface properties. This Ti substitution explains experimentally observed effects on the SnO2(110) surface.
Area of Science:
- Materials Science
- Surface Science
- Computational Chemistry
Background:
- Tin dioxide (SnO2) is a crucial n-type semiconductor with diverse applications.
- Surface properties of SnO2 are critical for its functionality, often modified by doping.
- Understanding doping mechanisms is key to tailoring SnO2 for specific uses.
Purpose of the Study:
- To investigate the energetic favorability and structural effects of Titanium (Ti) doping on the SnO2(110) surface.
- To elucidate the impact of Ti substitution on the electronic structure and surface properties of SnO2.
- To provide a theoretical basis for experimentally observed phenomena in Ti-doped SnO2.
Main Methods:
- First-principles calculations using a slab model approach.
- Geometrical optimization of four distinct Ti doping configurations.
- Band-structure calculations to analyze electronic properties.
Main Results:
- The most energetically favorable doping site is the substitution of Ti for a sixfold-coordinated Sn atom in the top layer.
- Ti doping induces surface relaxation, with nearby Sn and O atoms shifting towards the bulk.
- Significant modifications in the electronic structure, including band gap, band composition, charge density distribution, and work function, were observed.
Conclusions:
- Ti substitution at the top layer of SnO2(110) is the preferred doping configuration.
- Ti doping profoundly influences the surface relaxation and electronic properties of SnO2.
- The theoretical findings align with and explain experimental observations of Ti-doped SnO2.
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