Abstract
Valence and conduction states near the SiO2/Si(100) interface were directly observed using soft x-ray absorption and emission spectroscopy. For the O K-edge absorption spectra, the step-like structures were observed at 531, 533 and 534.5 eV. These step-like structures observed at 531, 533 and 534.5 eV were assigned to an oxygen atom bonding to Si1+ , Si 2+, and Si3+ of the interface, respectively. In the case of O K-edge emission spectra, with decreasing incident photon energy from 535 to 531 eV so as to shift the conduction band minimum of the interface towards Fermi energy, the corresponding valence band maximum was shifted to Fermi energy direction. Thus, the local band gap became narrower with the decrease of the oxidation number of the suboxide species. Further the interface structure was also discussed from the spectrum features.
Original language | English |
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Pages (from-to) | 209-212 |
Number of pages | 4 |
Journal | e-Journal of Surface Science and Nanotechnology |
Volume | 6 |
DOIs | |
Publication status | Published - 2008 Sep 25 |
Externally published | Yes |
Keywords
- Crystalline-amorphous interfaces
- Photoemission
- Si
- Silicon oxides
ASJC Scopus subject areas
- Biotechnology
- Bioengineering
- Condensed Matter Physics
- Mechanics of Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films