Twinning superlattices in indium phosphide nanowires

Details Twinning superlattices in indium phosphide nanowires Twinning superlattices in indium phosphide nanowires

2008-07-09

arxiv.org/abs/0807.1423v1

Nature 456 (2008), 369

Physics

Condensed Matter

Materials Science

18 pages, 4 figures

Scientific paper

10.1038/nature07570

Here, we show that we control the crystal structure of indium phosphide (InP) nanowires by impurity dopants. We have found that zinc decreases the activation barrier for 2D nucleation growth of zinc-blende InP and therefore promotes the InP nanowires to crystallise in the zinc blende, instead of the commonly found wurtzite crystal structure. More importantly, we demonstrate that we can, by controlling the crystal structure, induce twinning superlattices with long-range order in InP nanowires. We can tune the spacing of the superlattices by the wire diameter and the zinc concentration and present a model based on the cross-sectional shape of the zinc-blende InP nanowires to quantitatively explain the formation of the periodic twinning.

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