Journal
NANO LETTERS
Volume 8, Issue 11, Pages 4081-4086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl802408y
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Funding
- David and Janet Chyan Stanford Graduate Fellowship
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Analogous to planar heteroepitaxy, misfit dislocation formation and stress-driven surface roughening can relax coherency strains in misfitting core-shell nanowires. The effects of coaxial dimensions on strain relaxation in aligned arrays of Ge-core/Si-shell nanowires are analyzed quantitatively by transmission electron microscopy and synchrotron X-ray diffraction. Relating these results to reported continuum elasticity models for coaxial nanowire heterostructures provides valuable insights into the observed interplay of roughening and dislocation-mediated strain relaxation.
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