A new spectroscopic method for determination of energy distribution of interface states in the semiconductor band-gap

Hikaru Kobayashi, Tomohiro Kubota, Kenji Namba, Yoshihiro Nakato, Yatsushiro Nishioka

Research output: Contribution to journalArticle

Abstract

Measurements of X-ray photoelectron spectra (XPS) are performed for (3 nm-Pt/2.6 nm-oxide/p-InP(100)) and (2.5 nm-Pt/3.8 nm-oxide/n-GaAs(100)) MOS devices under biases. Upon applying a negative bias voltage to the InP (or GaAs) substrate with respect to the Pt layer, the substrate In 3d 5 2 (or As 3d 5 2) peak is shifted toward the lower binding energy, while it is shifted toward the higher binding energy by applying a positive bias. These shifts are caused by a change in the potential drop across the oxide layer due to accumulation of charges in interface states. The energy distribution of the interface states in the band-gap is obtained by analyzing the magnitudes of these shifts measured as a function of the bias voltage. The energy distribution has peaked-structure and the peaks are attributed to antisite and vacancy defects. The interface Fermi level of InP (or GaAs) is located near the energy level of the (+/0) transition of the PIn (or AsGa) antisite defects.

Original languageEnglish
Pages (from-to)595-600
Number of pages6
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume76
Issue numberC
DOIs
Publication statusPublished - 1995 Dec 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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