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Twin plane re-entrant mechanism for catalytic nanowire growth
Authors
,
,
+5 more
C Ducati
AD Gamalski
S Hofmann
R Sharma
PW Voorhees
Publication date
12 March 2014
Publisher
Abstract
A twin-plane based nanowire growth mechanism is established using Au catalyzed Ge nanowire growth as a model system. Video-rate lattice-resolved environmental transmission electron microscopy shows a convex, V-shaped liquid catalyst-nanowire growth interface for a âŸ̈112⟠© growth direction that is composed of two Ge {111} planes that meet at a twin boundary. Unlike bulk crystals, the nanowire geometry allows steady-state growth with a single twin boundary at the nanowire center. We suggest that the nucleation barrier at the twin-plane re-entrant groove is effectively reduced by the line energy, and hence the twin acts as a preferential nucleation site that dictates the lateral step flow cycle which constitutes nanowire growth. © 2014 American Chemical Society
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Last time updated on 15/07/2020