Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 25, Pages 5228-5230Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1759070
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SiGe Stranski-Krastanow islands coherently grown on Si(001) substrates by liquid phase epitaxy are typically made of truncated pyramids with {111} side facets, whereas the persistent presence of an (001) top facet indicates an energetical disadvantage of complete pyramids compared to truncated ones. We attribute this to a surface minimization process during the island evolution under the assumption of isotropically distributed surface energies and stable island facets. For the presence of {111} side facets we have theoretically derived a final geometrical aspect ratio of island base versus island height of 1.96, which is in excellent agreement with the experimentally derived averaged value of 2.08+/-0.10 within a concentration window between 9% and 30% germanium. (C) 2004 American Institute of Physics.
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