Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1793565 | Journal of Crystal Growth | 2009 | 6 Pages |
Abstract
The nanostructure of GaAs nanocrystals grown on Si(1 0 0) surface was investigated by plan-view and cross-sectional transmission electron microscopic observations. The shape change from nearly isotropic base to anisotropic rectangular base elongated along [0 1¯ 1] or [0 1 1] direction appears pronouncedly in GaAs nanocrystals above the major axis length of around 20 nm. In the GaAs nanocrystals with anisotropic rectangular base, there are parallel moiré fringes along the major axis and dense stacking faults along the minor axis, we found that {0 2 2} lattice spacings along the minor and major axes of the nanocrystal are nearly equivalent to those in bulk Si and GaAs, respectively. These results suggest that the stacking faults are formed on one of four {1 1 1} slip planes of larger-sized GaAs nanocrystal to relax the accumulated lattice strain, and that the GaAs nanocrystal preferentially grows along the ã0 1 1ã direction in which the stacking faults are repeatedly formed.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hiroyuki Usui, Satoshi Mukai, Hidehiro Yasuda, Hirotaro Mori,