Scarle, S. & Ewels, C. P. (2006) Kinetic Monte Carlo and density functional study of hydrogen enhanced dislocation glide in silicon. Eur. Phys. J. B, 51 195–208.
Added by: Florent Boucher (2016-05-12 13:21:37)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1434-6028
Clé BibTeX: Scarle2006
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Créateurs: Ewels, Scarle
Collection: Eur. Phys. J. B
Consultations : 1/373
Indice de consultation : 2%
Indice de popularité : 0.5%
We investigate Hydrogen Enhanced Dislocation Glide [HEDG], using n-fold way Kinetic Monte Carlo simulations of the interaction between hydrogen and 90 degrees partial dislocations in silicon, and a range of new density functional calculations. We examine two different hydrogen arrival species, as well as hydrogen recombination at the dislocation. The Monte Carlo simulations use a line-wise description of the dislocation line parameterized using density functional calculations of migration and formation energies of various dislocation line defects and their complexes with hydrogen. From this we suggest that the rate of H-2 expulsion from the dislocation core increases as we approach HEDG, but that if the concentration of the hydrogen species goes beyond that required for HEDG it then slows dislocation motion by choking the line with defects comprised of two hydrogen atoms in a reconstruction bond. A `dislocation engine' model is proposed whereby hydrogen enters the dislocation line, catalyses motion, and is expelled along the core as H-2.
Added by: Florent Boucher