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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Surface structure of V_{2}O_{3}(0001) revisited
Felix E Feiten1, Jan Seifert1,2, Joachim Paier3
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Physical Review Letters
|June 13, 2015
Summary
The V2O3(0001) surface is terminated by vanadyl groups, not the proposed O3 termination. This finding, supported by multiple techniques, revises surface structure understanding.
Area of Science:
- Surface science
- Materials science
- Solid state physics
Background:
- Previous studies proposed an O3 termination for the V2O3(0001) surface.
- This proposed termination involves a distorted hexagonal oxygen layer.
Purpose of the Study:
- To investigate and determine the correct surface termination of V2O3(0001).
- To reconcile conflicting interpretations of experimental data regarding the surface structure.
Main Methods:
- Quantitative low-energy electron diffraction (LEED)
- Scanning tunneling microscopy (STM)
- Fast atom scattering (FAS)
- Density functional theory (DFT) with Heyd-Scuseria-Ernzerhof (HSE) functional
- Ion beam triangulation
Main Results:
- Experimental and theoretical evidence indicates the V2O3(0001) surface is terminated by vanadyl (V═O) groups.
- Reanalysis of ion beam triangulation data shows it is consistent with vanadyl termination.
Conclusions:
- The V2O3(0001) surface reconstruction is characterized by vanadyl termination.
- This work corrects the previously proposed O3 termination model.
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