GaAs/AlGaAs nanowire heterostructures studied by scanning tunneling microscopy

L. Ouattara, A. Mikkelsen, N. Sköld, J. Eriksson, T.E.J. Knaapen, E. Cavar, W. Seifert, L. Samuelson, E. Lundgren

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Abstract

We directly image the interior of GaAs/AlGaAs axial and radial nanowire heterostructures with atomic-scale resolution using scanning tunneling microscopy. We show that formation of monolayer sharp and smooth axial interfaces are possible even by vapor-phase epitaxy. However, we also find that instability of the ternary alloys formed in the Au seed fundamentally limits axial heterostructure control, inducing large segment asymmetries. We study radial core-shell nanowires, imaging even ultrathin submonolayer shells. We demonstrate how large twinning-induced morphological defects at the wire surfaces can be removed, ensuring the formation of wires with atomically flat sides.
Original languageEnglish
Pages (from-to)2859-2864
Number of pages6
JournalNano Letters
Volume7
Issue number9
DOIs
Publication statusPublished - 2007

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