Journal
NANOTECHNOLOGY
Volume 20, Issue 41, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/41/415701
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Funding
- NANOMAT [182091]
- Research Council of Norway [187692]
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We report the growth of GaAs/AlGaAs core-shell nanowires (NWs) on GaAs(111)B substrates by Au-assisted molecular beam epitaxy. Electron microscopy shows the formation of a wurtzite AlGaAs shell structure both in the radial and the axial directions outside a wurtzite GaAs core. With higher Al content, a lower axial and a higher radial growth rate of the AlGaAs shell were observed. Room temperature and low temperature (4.4 K) micro-photoluminescence measurements show a much higher radiative efficiency from the GaAs core after the NW is overgrown with a radial AlGaAs shell.
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