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A kinetic model for step flow growth in molecular beam epitaxy

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
600
Issue
17
Identifiers
DOI: 10.1016/j.susc.2006.06.031
Keywords
  • Epitaxy
  • Step Flow
  • Kinetic Theory

Abstract

Abstract A terrace–step–kink model for epitaxial step flow growth of steps with no bonds along them is derived from kinetic arguments. The model is combined with an existing model for the steps that have strong bonding along them to describe steps of arbitrary orientation in terms of densities of adatoms, step adatoms and kinks. A planar steady-state solution for a simplified version of the model is constructed and analyzed. Different mass transport mechanisms are modeled that result in different far-from-equilibrium behavior, confirming that edge diffusion is the main factor stabilizing the steps during growth. Furthermore kinetic Wulff shapes are constructed from the calculated step velocities.

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