Abstract
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
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
| Original language | English |
|---|---|
| Pages (from-to) | 2743-2747 |
| Journal | Nano Letters |
| Volume | 6 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2006 |
Bibliographical note
The information about affiliations in this record was updated in December 2015.The record was previously connected to the following departments: Solid State Physics (011013006), Polymer and Materials Chemistry (LTH) (011001041)
Subject classification (UKÄ)
- Nano-technology
- Condensed Matter Physics (including Material Physics, Nano Physics)