Equilibrium shapes and energies of coherent strained InP islands

Details Equilibrium shapes and energies of coherent strained InP islands Equilibrium shapes and energies of coherent strained InP islands

1999-06-02

arxiv.org/abs/cond-mat/9906025v1

Phys. Rev. B 60, 17008-17015 (1999)

Physics

Condensed Matter

Materials Science

10 pages including 6 figures. Submitted to Phys. Rev. B. Related publications can be found at http://www.fhi-berlin.mpg.de/th/

Scientific paper

10.1103/PhysRevB.60.17008

The equilibrium shapes and energies of coherent strained InP islands grown on GaP have been investigated with a hybrid approach that has been previously applied to InAs islands on GaAs. This combines calculations of the surface energies by density functional theory and the bulk deformation energies by continuum elasticity theory. The calculated equilibrium shapes for different chemical environments exhibit the {101}, {111}, {\=1\=1\=1} facets and a (001) top surface. They compare quite well with recent atomic-force microscopy data. Thus in the InP/GaInP-system a considerable equilibration of the individual islands with respect to their shapes can be achieved. We discuss the implications of our results for the Ostwald ripening of the coherent InP islands. In addition we compare strain fields in uncapped and capped islands.

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