Phys. Rev. Lett. 95, 206101 (2005) [4 pages]Shape and Composition Map of a Prepyramid Quantum DotReceived 3 January 2005; published 10 November 2005 We present a theory for the shape, size, and nonuniform composition profile of a small prepyramid island in an alloy epitaxial film when surface diffusion is much faster than deposition and bulk diffusion. The predicted composition profile has segregation of the larger misfit component to the island peak, with segregation enhanced by misfit strain and solute strain but retarded by alloy solution thermodynamics. Vertical composition gradients through the center of the island due to this mechanism are on the order of 2%/nm for GeXSi1-X/Si and 10–15%/nm for InXGa1-XAs/GaAs. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.206101
DOI:
10.1103/PhysRevLett.95.206101
PACS:
68.55.−a, 61.46.+w, 68.35.−p, 68.65.−k
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