GaAs/AlGaAs nanowire heterostructures studied by scanning tunneling microscopy |
| |
Authors: | Ouattara Lassana Mikkelsen Anders Sköld Niklas Eriksson Jessica Knaapen Thijs Cavar Elizabeta Seifert Werner Samuelson Lars Lundgren Edvin |
| |
Affiliation: | Synchrotron Radiation Research, Lund University, Box 118, 22100 Lund, Sweden. |
| |
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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|