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Atomically Traceable Nanostructure Fabrication
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Domain competition during ballistic deposition: effect of surface diffusion and surface patterning.

Yukio Saito1, Shoko Omura

  • 1Department of Physics, Keio University, Yokohama 223-8522, Japan. yukio@rk.phys.keio.ac.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2011
PubMed
Summary

Domain competition during aggregate growth is studied. On flat substrates, domain density follows power laws, while surface diffusion causes rapid decay. Pillar patterns influence domain suppression.

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Aggregate growth and domain competition are crucial in thin film formation and material properties.
  • Ballistic deposition models physical processes where particles arrive at a surface with high kinetic energy.

Purpose of the Study:

  • To investigate domain competition during aggregate growth under ballistic deposition on a 1D substrate.
  • To understand how substrate topography and surface diffusion affect domain density and growth dynamics.

Main Methods:

  • Kinetic Monte Carlo simulations were employed to model the deposition and growth processes.
  • Analysis of domain population density (ρ) as a function of height (h) was performed.
  • Investigated effects of surface diffusion and nanopillar patterned substrates.

Main Results:

  • On a flat substrate without surface diffusion, domain density decreases as ρ ∼ h(-2/3).
  • With surface diffusion, domain density decays more rapidly, as ρ ∼ 1/h.
  • On nanopillar substrates, domains from pillars can suppress domains in gaps; suppression requires pillar periodicity (λ) below a critical value (λc).

Conclusions:

  • Substrate topography and surface diffusion significantly alter domain competition dynamics.
  • A critical pillar periodicity determines the effectiveness of domain suppression in patterned substrates.
  • The study provides insights into controlling microstructure evolution during thin film deposition.