TITLE

Mechanism of lateral ordering of InP dots grown on InGaP layers

AUTHOR(S)
Bortoleto, J. R. R.; Gutiérrez, H. R.; Cotta, M. A.; Bettini, J.
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p013105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The mechanisms leading to the spontaneous formation of a two-dimensional array of InP/InGaP dots grown by chemical-beam epitaxy are discussed. Samples where the InGaP buffer layer was grown at different conditions were characterized by transmission electron microscopy. Our results indicate that a periodic strain field related to lateral two-dimensional compositional modulation in the InGaP buffer layer determines the dot nucleation positions during InP growth. Although the periodic strain field in the InGaP is large enough to align the InP dots, both their shape and optical properties are effectively unaltered. This result shows that compositional modulation can be used as a tool for in situ dot positioning.
ACCESSION #
18008423

 

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