MISFIT DISLOCATION GENERATION FROM DISSOCIATED THREADING DISLOCATIONS IN STRAINED-LAYER HETEROSTRUCTURES

Conference item

The generation mechanisms of misfit dislocations from pre-existing dissociated threading dislocations in lattice-mismatched heterostructures are considered theoretically. Using elasticity theory, the corresponding critical thicknesses in anisotropic media are derived. The fact that the critical thickness derived from a dissociated threading dislocation is less than that from an undissociated threading dislocation, along with the experimental evidence, suggests that the model of misfit dislocation generation by dissociated threading dislocations is more likely. Since the gliding geometries of misfit dislocations depend upon which partial is the leading partial, and upon the critical thicknesses of each partial, all possible cares are considered.

Authors: Zou, J; Cockayne, D

• Publication status: Published
• Journal: INTERFACES II
• Volume: 189-
• Pages: 279-284
• Publication date: 1995-01-01
• Event title: 2nd International Conference on the Role of Interfaces in Advanced Materials Design, Processing and Performance
• ISSN: 0255-5476
• ISBN: 0878496939
• Keywords: STRAINED INTERFACE; MISFIT DISLOCATION; STRAINED-LAYER HETEROSTRUCTURE; PARTIAL DISLOCATION; CRITICAL THICKNESS; STRAIN RELIEF MECHANISM; ANISOTROPIC; DISSOCIATION