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Compositional analysis based on electron holography and a chemically sensitive reflection.

A Rosenauer1, D Van Dyck, M Arzberger

  • 1EMAT, University of Antwerp, Belgium. rosenaue@lemming0.lem.uni-karlsruhe.de

Ultramicroscopy
|June 8, 2001
PubMed
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This study introduces a new electron holography method for analyzing low-dimensional heterostructures. The technique accurately determines local composition and thickness, revealing segregation in AlAs/GaAs superlattices.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Electron Microscopy

Background:

  • Accurate compositional analysis is crucial for understanding low-dimensional heterostructures.
  • Electron holography offers potential for nanoscale chemical analysis but requires refined methodologies.

Purpose of the Study:

  • To develop and demonstrate a novel electron holography method for compositional analysis of heterostructures.
  • To quantify local composition and thickness with high precision.

Main Methods:

  • Utilizing electron holography with a chemically sensitive (0 0 2) reflection.
  • Employing off-axis imaging and analyzing hologram side bands.
  • Iterative, self-consistent evaluation of phase and amplitude data, accounting for delocalization effects.

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Main Results:

  • Successfully applied the method to an AlAs/GaAs(0 0 1) superlattice.
  • Obtained detailed concentration profiles, revealing segregation phenomena.
  • Quantified the segregation efficiency as R = 0.51 +/- 0.02.

Conclusions:

  • The presented electron holography method provides a robust approach for compositional analysis of heterostructures.
  • The technique is capable of revealing and quantifying interfacial phenomena like segregation.