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Determination of interlayer diffusion parameters for Ag/Ag(111)

Roos1, Tringides

  • 1Department of Physics, Bradley University, Peoria, Illinois 61625, USA.

Physical Review Letters
|September 6, 2000
PubMed
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The Ag/Ag(111) system

Area of Science:

  • Surface science
  • Materials science
  • Thin film growth

Background:

  • The Ag/Ag(111) epitaxial system exhibits three-dimensional growth.
  • This growth is attributed to a significant excess diffusion barrier at step edges (DeltaE(s) = 0.13 eV).
  • Accurate measurement of step edge barriers is crucial for understanding growth dynamics.

Purpose of the Study:

  • To investigate the relationship between step edge barriers and adatom diffusion.
  • To determine if the prefactors for hopping over a step (nu(s)) and on a terrace (nu(t)) differ in the Ag/Ag(111) system.
  • To quantify the ratio nu(s)/nu(t) using experimental data.

Main Methods:

  • Utilized various experimental techniques to measure the step edge barrier on Ag/Ag(111).
  • Analyzed experimental data to determine adatom diffusion probabilities.

Related Experiment Videos

  • Calculated the ratio of hopping prefactors over steps and on terraces.

    • Main Results:

    • Experimental data were collected across a wide coverage range for the Ag/Ag(111) system.
    • The ratio of the prefactor for hopping over a step to that for hopping on a terrace was determined.
    • The study found nu(s)/nu(t) = 10(2.0+/-0.3).

    Conclusions:

    • The prefactors for adatom hopping over steps and on terraces are not identical in the Ag/Ag(111) system.
    • The determined ratio nu(s)/nu(t) provides critical insight into the kinetics of thin film growth.
    • These findings contribute to a deeper understanding of surface diffusion mechanisms in epitaxial systems.