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Self-branching in GaN Nanowires Induced by a Novel Vapor-Liquid-Solid Mechanism

Published online by Cambridge University Press:  01 February 2011

Chang-Yong Nam ,
Douglas Tham  and
John E. Fischer
Chang-Yong Nam
Affiliation:
cynam@bnl.gov, Brookhaven National Laboratory, Center for Functional Nanomaterials, Bldg. 555, Upton, NY, 11973-5000, United States, 631-344-7066
Douglas Tham
Affiliation:
tham@caltech.edu, California Institute of Technology, Department of Materials Science, Pasadena, CA, 91125, United States
John E. Fischer
Affiliation:
fischer@seas.upenn.edu, University of Pennsylvania, Department of Materials Science and Engineering, Philadelphia, PA, 19104, United States
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Abstract

Nanowires have great potential as building blocks for nanoscale electrical and optoelectronic devices. The difficulty in achieving functional and hierarchical nanowire structures poses an obstacle to realization of practical applications. While post-growth techniques such as fluidic alignment might be one solution, self-assembled structures during growth such as branches are promising for functional nanowire junction formation. In this study, we report vapor-liquid-solid (VLS) self-branching of GaN nanowires during AuPd-catalyzed chemical vapor deposition (CVD). This is distinct from branches grown by sequential catalyst seeding or vapor-solid (VS) mode. We present evidence for a VLS growth mechanism of GaN nanowires different from the well-established VLS growth of elemental wires. Here, Ga solubility in AuPd catalyst is limitless as suggested by a hypothetical pseudo-binary phase diagram, and the direct reaction between NH3 vapor and Ga in the liquid catalyst induce the nucleation and growth. The self-branching can be explained in the context of the proposed VLS scheme and migration of Ga-enriched AuPd liquid on Ga-stabilized polar surface of mother nanowires. This work is supported by DOE Grant No. DE-FG02-98ER45701.

Keywords

nanostructureIII-Vnucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1058: Symposium JJ – Nanowires–Novel Assembly Concepts and Device Integration , 2007 , 1058-JJ04-03
Copyright
Copyright © Materials Research Society 2008

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