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Determination of the Ehrlich-Schwoebel barrier in epitaxial growth of thin films

We demonstrate an approach for determining the "effective" Ehrlich-Schwoebel (ES) step-edge barrier, an important kinetic constant to control the interlayer mass transport in epitaxial growth of thin films. The approach exploits the rate difference between the growth and/or decay of an adatom and a vacancy two-dimensional island, which allows the "effective" ES barrier to be determined uniquely by fitting with a single parameter. Application to growth of Pb islands produces an effective ES barrier of similar to 83 +/- 10 meV on Pb(111) surface at room temperature.