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GaAs/AlGaAs nanowire heterostructures studied by scanning tunneling microscopy

Författare:
Publiceringsår: 2007
Språk: Engelska
Sidor: 2859-2864
Publikation/Tidskrift/Serie: NANO LETTERS
Volym: 7
Nummer: 9
Länkar:
Dokumenttyp: Artikel
Förlag: AMER CHEMICAL SOC

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1530-6984

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