Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/243507
Type: Artigo de periódico
Title: Interaction Between Lamellar Twinning And Catalyst Dynamics In Spontaneous Core-shell Ingap Nanowires
Author: Oliveira
D. S.; Tizei
L. H. G.; Li
A.; Vasconcelos
T. L.; Senna
C. A.; Archanjo
B. S.; Ugarte
D.; Cotta
M. A.
Abstract: Semiconductor nanowires oriented along the [211] direction usually present twins parallel to their axis. For group IV nanowires this kind of twin allows the formation of a catalyst-nanowire interface composed of two equivalent {111} facets. For III-V nanowires, however, the twin will generate two facets with different polarities. In order to keep the < 211 > orientation stable, a balance in growth rates for these different facets must be reached. We report here the observation of stable, micron-long < 211 >-oriented InGaP nanowires with a spontaneous core-shell structure. We show that stacking fault formation in the crystal region corresponding to the {111} A facet termination provides a stable NW/NP interface for growth along the < 211 > direction. During sample cool down, however, the catalyst migrates to a lateral {111} B facet, allowing the growth of branches perpendicular to the initial orientation. In addition to that, we show that the core-shell structure is non-concentric, most likely due to the asymmetry between the facets formed in the NW sidewall; this effect generates stress along the nanowire, which can be relieved through bending.
Subject: Iii-v Nanowires
Phosphide Nanowires
Silicon Nanowires
Crystal-structure
Gaas Nanowires
Growth
Morphology
Surface
Heterostructures
Direction
Country: CAMBRIDGE
Editor: ROYAL SOC CHEMISTRY
Citation: Interaction Between Lamellar Twinning And Catalyst Dynamics In Spontaneous Core-shell Ingap Nanowires. Royal Soc Chemistry, v. 7, p. 12722-12727 2015.
Rights: aberto
Identifier DOI: 10.1039/c5nr02747k
Address: http://pubs.rsc.org/en/Content/ArticleLanding/2015/NR/C5NR02747K#!divAbstract
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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