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Figure 5
Formation of a 90° elbow in an Si NW. Such a shape can be explained by a toppling effect. First, the nanowire grows in the 〈110〉 direction, but, because of the angle between the {111} tip surface and the growth direction, the droplet topples at the edge of the nanowire. The nanowire continues to grow in epitaxy with the 〈110〉 nanowire but in a 〈111〉 direction.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 42| Part 2| January 2009| Pages 242-252
doi:10.1107/S0021889808042131
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