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Phase Segregation in AlInP Shells on GaAs Nanowires

Författare:
Publiceringsår: 2006
Språk: Engelska
Sidor: 2743-2747
Publikation/Tidskrift/Serie: Nano Letters
Volym: 6
Nummer: 12
Dokumenttyp: Artikel
Förlag: American Chemical Society

Sammanfattning

We have studied morphology and phase segregation of AlInP shells on GaAs nanowires. Photoluminescence measurements on single core-
shell nanowires indicated variations in the shell composition, and phase segregation was confirmed by cross-sectional scanning transmission
electron microscopy on 30 nm thin slices of the wires. It was discovered that Al-rich domains form in the á112ñ directions where two {110}
shell facets meet during growth. We propose that the mechanism behind this phase segregation is a variation in the chemical potential along
the circumference of the nanowire together with a difference in diffusion lengths for the different growth species. From the morphology of the
core and the shell, we conclude that the side facet growth is temperature dependent forming {112} facets at low growth temperature and
{110} facets at high growth temperature

Disputation

Nyckelord

  • Technology and Engineering

Övriga

Published
Yes
  • ISSN: 1530-6984

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