Defect-Free GaAs/AlGaAs Core–Shell Nanowires on Si Substrates

We report straight and vertically aligned defect-free GaAs nanowires grown on Si(111) substrates by metal–organic chemical vapor deposition. By deposition of thin GaAs buffer layers on Si substrates, these nanowires could be grown on the buffer layers with much less stringent conditions as otherwise...

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Bibliographic Details
Published in:Crystal growth & design 2011-07, Vol.11 (7), p.3109-3114
Main Authors: Kang, Jung-Hyun, Gao, Qiang, Joyce, Hannah J, Tan, Hark Hoe, Jagadish, Chennupati, Kim, Yong, Guo, Yanan, Xu, Hongyi, Zou, Jin, Fickenscher, Melodie A, Smith, Leigh M, Jackson, Howard E, Yarrison-Rice, Jan M
Format: Article
Language:English
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Summary:We report straight and vertically aligned defect-free GaAs nanowires grown on Si(111) substrates by metal–organic chemical vapor deposition. By deposition of thin GaAs buffer layers on Si substrates, these nanowires could be grown on the buffer layers with much less stringent conditions as otherwise imposed by epitaxy of III–V compounds on Si. Also, crystal-defect-free GaAs nanowires were grown by using either a two-temperature growth mode consisting of a short initial nucleation step under higher temperature followed by subsequent growth under lower temperature or a rapid growth rate mode with high source flow rate. These two growth modes not only eliminated planar crystallographic defects but also significantly reduced tapering. Core–shell GaAs–AlGaAs nanowires grown by the two-temperature growth mode showed improved optical properties with strong photoluminescence and long carrier life times.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg2003657