Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 91, Issue 4, Pages 280-286Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2011.558859
Keywords
nanowire; III-V; wurtzite; zinc-blende; surface facets; failure
Categories
Funding
- NSF [CMMI-0855853, CMMI-0926178]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0926178] Funding Source: National Science Foundation
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Using molecular dynamics, we study the role of the surface facets of III-V nanowires on their failure during tensile deformation. We find that wurtzite (WZ) nanowires can withstand higher levels of stress and strain at failure compared to zinc-blende (ZB) nanowires. We observe that it is easier to nucleate a crack on a ZB nanowire due to the stress singularities that occur at the intersection of two opposing {111} facets. In WZ nanowires, we observe that cracks always nucleate at the intersection between two adjacent {11 (2) over bar} surface facets. We explain these phenomena using fracture mechanics techniques based on energetics of crack formation.
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