Junyan Guo - Morphological Evolution and Ordered Quantum Structure Formation in Heteroepitaxial Core−Shell Nanowires

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  Publication Details (including relevant citation   information):

  ACS Nano, 2010,   4 (8), pp 4455–4462

  DOI: 10.1021/nn101218r

  Publication Date (Web): August 3, 2010

  Copyright © 2010 American Chemical Society


  We have performed three-dimensional dynamic simulations to study   strain-driven morphological evolution and the formation of   quantum structures on heteroepitaxial core−shell nanowire   surfaces. Our simulations show that depending on geometric and   material parameters, such as the radius of the wire, the   thickness of the shell, and the mismatch strain, various surface   morphologies including smooth core−shell nanowire surfaces,   nanoring arrays, nanowire arrays, and ordered quantum dot arrays   can be obtained by controlling initial surface configurations   through prepatterning. It is also shown that these quantum   structures may be trapped in a metastable state and may undergo a   series of metastable state transitions during subsequent dynamic   evolution. Our results identify possible pathways for fabrication   of ordered quantum structures on the epitaxial core−shell   nanowire surfaces and provide guidelines for achieving smooth   core−shell structures.

  Address (URL): http://pubs.acs.org/doi/abs/10.1021/nn101218r