NDLI: Interaction between lamellar twinning and catalyst dynamics in spontaneous core

Content Provider	Royal Society of Chemistry (RSC)
Author	Archanjo, B. S. Cotta, M. A. Senna, C. A. Li, A. Vasconcelos, T. L. Tizei, L. H. G. Ugarte, D. Oliveira, D. S.
Copyright Year	2015
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.
Starting Page	12722
Ending Page	12727
Page Count	6
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	29
Journal	Nanoscale
DOI	10.1039/c5nr02747k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Indium gallium phosphide Nanowire NW Stacking fault
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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