Influence of strain on dislocation core in silicon

L Pizzagalli and J Godet and S Brochard, PHILOSOPHICAL MAGAZINE, 98, 1151-1169 (2018).

DOI: 10.1080/14786435.2018.1431412

First principles, density functional-based tight binding and semi- empirical interatomic potentials calculations are performed to analyse the influence of large strains on the structure and stability of a 60 degrees dislocation in silicon. Such strains typically arise during the mechanical testing of nanostructures like nanopillars or nanoparticles. We focus on bi-axial strains in the plane normal to the dislocation line. Our calculations surprisingly reveal that the dislocation core structure largely depends on the applied strain, for strain levels of about 5%. In the particular case of bi-axial compression, the transformation of the dislocation to a locally disordered configuration occurs for similar strain magnitudes. The formation of an opening, however, requires larger strains, of about 7.5%. Furthermore, our results suggest that electronic structure methods should be favoured to model dislocation cores in case of large strains whenever possible.

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