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Related Experiment Videos

XAFS and X-ray reflectivity study of III-V compound native oxide/GaAs interfaces.

S K Cheong1, B A Bunker, D C Hall

  • 1Department of Physics, University of Notre Dame, IN 46556, USA.

Journal of Synchrotron Radiation
|August 22, 2001
PubMed
Summary

This study used X-ray absorption fine structure (XAFS) and X-ray reflectivity to analyze the atomic environment and density profile of oxidized AlGaAs films on GaAs substrates. Findings are crucial for developing advanced III-V MOSFET devices.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Surface Science

Background:

  • High-performance III-V MOSFET devices require understanding interfacial properties.
  • Oxidized aluminum gallium arsenide (AlGaAs) on gallium arsenide (GaAs) is a key material system.

Purpose of the Study:

  • To investigate the local atomic environment of Gallium (Ga) and Arsenic (As) in bulk and interfacial oxidized AlGaAs.
  • To determine the density profile of oxidized AlGaAs films on GaAs substrates.
  • To understand Arsenic incorporation, interfacial strain, and local structural parameters.

Main Methods:

  • Fluorescence-mode X-ray Absorption Fine Structure (XAFS) spectroscopy.
  • Total external-reflection mode XAFS.
  • X-ray reflectivity (XRR) experiments.

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Main Results:

  • Characterized the local atomic environment of Ga and As in bulk and interfacial oxidized AlGaAs.
  • Determined the density profile of the oxide film as a function of depth using XRR.
  • Provided insights into As incorporation and interfacial strain.

Conclusions:

  • The study provides critical data on the atomic structure and density of oxidized AlGaAs/GaAs interfaces.
  • Understanding these interfacial properties is essential for the development of next-generation III-V MOSFETs.