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Structure and motion of basal dislocations in silicon carbide

Lookup NU author(s): Professor Patrick Briddon

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Abstract

30degrees and 90degrees Shockley partial dislocations lying in {111} and basal planes of cubic and hexagonal silicon carbide, respectively, are investigated theoretically. Density-functional-based tight-binding total-energy calculations are used to determine the core structure and energetics of the dislocations. In a second step their electronic structure is investigated using a pseudopotential method with a Gaussian basis set. Finally, the thermal activation barriers to glide motion of 30degrees and 90degrees Shockley partials are calculated in terms of a process involving the formation and migration of kinks along the dislocation line. The mechanism for enhanced dislocation movement observed under current injection conditions in bipolar silicon carbide devices is discussed.

Publication metadata

Author(s): Blumenau AT, Fall CJ, Jones R, Oberg S, Frauenheim T, Briddon PR

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2003

Volume: 68

Issue: 17

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevB.68.174108

DOI: 10.1103/PhysRevB.68.174108

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