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Mounding instability and incoherent surface kinetics.

S V Ghaisas1

  • 1Department of Electronic Science, University of Pune, Pune 411007, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 15, 2003
PubMed
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Mounding instability during vapor deposition is linked to varying adatom kinetics across surface structures. Simulations confirm that mound growth depends on adatom flux, with a logarithmic time dependence in (1+1) dimensions.

Area of Science:

  • Surface science
  • Materials science
  • Condensed matter physics

Background:

  • Conserved growth from vapor often exhibits mounding instability.
  • Understanding adatom kinetics is crucial for controlling surface morphology.

Purpose of the Study:

  • To analyze mounding instability within the framework of adatom kinetics.
  • To investigate the influence of local surface structure on adatom behavior.

Main Methods:

  • Theoretical analysis of adatom kinetics on a growing surface.
  • Continuum description considering disjoint regions based on local structure.
  • Dimensional analysis for (1+1) and (2+1) growth dimensions.
  • Computational simulations to validate theoretical predictions.

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Main Results:

  • Adatom kinetics vary with local surface structure, creating disjoint regions.
  • Mounding instability is particularly pronounced under these conditions.
  • Lateral mound growth is governed by downward adatom flux across steps.
  • A logarithmic dependence on time (ln t) is predicted and observed in (1+1) dimensions.

Conclusions:

  • Local surface structure significantly impacts adatom kinetics and growth instability.
  • The proposed model accurately predicts mound growth behavior.
  • Further discussion on growth dynamics in (2+1) dimensions is provided.