Theoretical consideration of misfit dislocation nucleation by partial dislocations in [001] strained-layer heterostructures

The nucleation of misfit dislocations through the extension of dissociated dislocations in the strained interface is considered theoretically. The predicted critical thickness of misfit dislocation nucleation by a dissociated dislocation is compared with that predicted for a perfect dislocation. It is shown that the model of misfit dislocation nucleation by the movement of a dissociated dislocation is more likely.