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Local density of states at metal-semiconductor interfaces: an atomic scale study
T Iffländer1, S Rolf-Pissarczyk1, L Winking1
1IV. Physical Institute - Solids and Nanostructures, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
We studied iron on gallium arsenide interfaces using atomic resolution microscopy. Our findings reveal metal-induced gap states and bond polarization are key to understanding Schottky barrier height at these semiconductor interfaces.
Area of Science:
- Materials Science
- Surface Science
- Semiconductor Physics
Background:
- Understanding metal-semiconductor interfaces is crucial for electronic devices.
- Iron on Gallium Arsenide (Fe/GaAs) interfaces are model systems for Schottky barrier formation.
Purpose of the Study:
- To investigate the atomic and electronic structure of Fe/GaAs(110) interfaces.
- To elucidate the mechanisms governing Schottky barrier height at metal-semiconductor junctions.
Main Methods:
- Cross-sectional scanning tunneling microscopy and spectroscopy (STM/STS) with atomic resolution.
- Density functional theory (DFT) calculations.
- 3D finite element modeling of the space charge region.
Main Results:
- Atomic resolution imaging of abrupt, defect-free Fe/GaAs(110) interfaces.
- Probed local density of states revealed contributions from metal-induced gap states (MIGS) and bond polarization.
- DFT calculations corroborated the experimental findings.
Conclusions:
- A combined model of MIGS and bond polarization accurately describes ideal metal-semiconductor interfaces.
- Precise Schottky barrier height values were determined using finite element modeling.
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