Capture cross-section of threading dislocations in thin films

The capture cross section for annihilation of two threads with opposite Burgers vectors moving on orthogonal slip planes in a thin film is examined using a numerical model. The initial configurations of threads that lead to annihilation are mapped out for a range of applied film stresses. The area of the region of initial configurations that lead to annihilation at a given stress and thickness is the capture cross-section. The size of the capture cross-section is shown to be highly sensitive to the applied stress relative to the critical stress for dislocation motion imposed by the film thickness.

► We study the effect of film stress on capture cross-section of interacting threads.
► Capture cross-section area diverges near film channeling stress.
► Thread interactions are much more likely when local stress is near critical stress.