Optical phonons as a probe to determine both composition and strain in InxAl(1−x) As quantum dots embedded in an AlAs matrix

InxAl(1−x)As quantum dots (QDs) embedded in an AlAs matrix were studied using Raman scattering and photoluminescence spectroscopy techniques. The longitudinal optical (LO) and transverse optical (TO) In-As bond vibrations frequencies are found to depend on both composition and strain. Using differen...

Full description

Saved in:
Bibliographic Details
Published in:Europhysics letters 2014-01, Vol.105 (1), p.16003
Main Authors: Volodin, V. A., Sinyukov, M. P., Sachkov, V. A., Stoffel, M., Rinnert, H., Vergnat, M.
Format: Article
Language:English
Subjects:
63.20.Pw
63.20.Ry
78.40.Fy
Composition
Condensed Matter
Materials Science
Photoluminescence
Physics
Quantum dots
Raman spectra
Stoichiometry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:InxAl(1−x)As quantum dots (QDs) embedded in an AlAs matrix were studied using Raman scattering and photoluminescence spectroscopy techniques. The longitudinal optical (LO) and transverse optical (TO) In-As bond vibrations frequencies are found to depend on both composition and strain. Using different scattering geometries (allowed for LO or for TO modes) we were able to obtain the experimental values of these frequencies. By comparing these values with the calculated frequencies, one can determine both the mean composition (stoichiometry parameter x) and the biaxial strain in InxAl(1−x)As QDs embedded in an AlAs matrix. Our approach is simple, non-destructive and fast.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/105/16003