Article Dans Une Revue Nanoscale Année : 2015

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

Résumé

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.

Dates et versions

hal-04882617 , version 1 (13-01-2025)

Identifiants

Citer

D.S. Oliveira, L.H.G. Tizei, A. Li, T.L. Vasconcelos, C.A. Senna, et al.. Interaction between lamellar twinning and catalyst dynamics in spontaneous core-shell InGaP nanowires. Nanoscale, 2015, 7 (29), pp.12722-12727. ⟨10.1039/c5nr02747k⟩. ⟨hal-04882617⟩
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