Direct observation of valence and conduction states near the SiO 2/Si(100) interface

Yoshiyuki Yamashita, Susumu Yamamot, Kozo Mukai, Jun Yoshinobu, Yoshihisa Harada, Takashi Tokushima, Shik Shin

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)209-212
Number of pages4
Journale-Journal of Surface Science and Nanotechnology
Volume6
DOIs
Publication statusPublished - 2008 Sep 25
Externally publishedYes

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

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