Twin plane re-entrant mechanism for catalytic nanowire growth.


Type
Article
Change log
Authors
Gamalski, Andrew D 
Voorhees, Peter W 
Sharma, Renu 
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 ⟨112⟩ 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.

Description
Keywords
Nanowire, environmental transmission electron microscopy, twin plane re-entrant mechanism, vapor-liquid-solid growth model
Journal Title
Nano Lett
Conference Name
Journal ISSN
1530-6984
1530-6992
Volume Title
14
Publisher
American Chemical Society (ACS)
Sponsorship
European Research Council (279342)
S. H. acknowledges funding from ERC grant InsituNANO (project number 279342). A. D. G. acknowledges funding from the Marshall Aid Commemoration Commission and the National Science Foundation. C. D. acknowledge funding from the Royal Society. P.V. acknowledges the support of ONR grant N00014-12-1-0198. We gratefully acknowledge the use of facilities within the LeRoy Eyring Center for Solid State Science at Arizona State University.