Interaction between lamellar twinning and catalyst dynamics in spontaneous core-shell InGaP nanowires

D.S. Oliveira, L.H.G. Tizei, A. Li, T.L. Vasconcelos, C.A. Senna, B.S. Archanjo, D. Ugarte, M.A. Cotta

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

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 orientation stable, a balance in growth rates for these different facets must be reached. We report here the observation of stable, micron-long -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 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.

Original languageEnglish
Pages (from-to)12722-12727
Number of pages6
JournalNanoscale
Volume7
Issue number29
DOIs
Publication statusPublished - 7 Aug 2015

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