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The equilibrium shapes and energies of coherent strained InP islands grown onGaP have been investigated with a hybrid approach that has been previouslyapplied to InAs islands on GaAs. This combines calculations of the surfaceenergies by density functional theory and the bulk deformation energies bycontinuum elasticity theory. The calculated equilibrium shapes for differentchemical 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 individualislands with respect to their shapes can be achieved. We discuss theimplications of our results for the Ostwald ripening of the coherent InPislands. In addition we compare strain fields in uncapped and capped islands.

Equilibrium shapes and energies of coherent strained InP islands