Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.025503
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Funding
- NSF [DMR-0606395, DMR-0907483, CMMI-0926412]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0926412] Funding Source: National Science Foundation
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Nanowire growth in the standard < 111 > direction is assumed to occur at a planar catalyst-nanowire interface, but recent reports contradict this picture. Here we show that a nonplanar growth interface is, in fact, a general phenomenon. Both III-V and group IV nanowires show a distinct region at the trijunction with a different orientation whose size oscillates during growth, synchronized with step flow. We develop an explicit model for this structure that agrees well with experiment and shows that the oscillations provide a direct visualization of catalyst supersaturation. We discuss the implications for wire growth and structure.
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