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Perturbation-induced compositional instability in epitaxial binary-alloy films.

S R Lee1, N A Modine

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185-0601, USA.

Physical Review Letters
|November 22, 2002
PubMed
Summary
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Surface strain drives instability and decomposition in semiconductor alloys. Configurational entropy limits this process, preventing complete breakdown in miscible materials.

Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid State Physics

Background:

  • Semiconductor alloys are crucial for electronic devices.
  • Understanding alloy instability is key to material design.
  • Miscible alloys can unexpectedly decompose.

Purpose of the Study:

  • Investigate the thermodynamic drivers of instability in planar semiconductor alloys.
  • Identify the mechanism behind decomposition in normally miscible alloys.
  • Develop a stability diagram for alloy perturbations.

Main Methods:

  • Analysis of the thermodynamic kernel in dynamic instability models.
  • Examination of epitaxial surface strain and perturbation geometry.
  • Development of a nonlinear stability diagram.

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Main Results:

  • Surface strain amplification is identified as the elastic cause of instability.
  • Decomposition in miscible alloys is driven by perturbation energetics.
  • Configurational entropy limits the growth of unstable perturbations.

Conclusions:

  • Epitaxial strain is the primary driver for semiconductor alloy instability.
  • Instability leads to alloy decomposition, even in miscible systems.
  • Configurational entropy provides a stabilizing effect against large perturbations.