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Cathodoluminescence Wavelength Imaging Study of Clustering in InAs/GaAs Self-Assembled Quantum Dots

Published online by Cambridge University Press:  10 February 2011

D. H. Rich ,
C. Zhang ,
I. Mukhametzhanov  and
A. Madhukar
D. H. Rich
Affiliation:
Department of Materials Science and Engineering, Photonic Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089-0241, danrich@usc.edu
C. Zhang
Affiliation:
Department of Materials Science and Engineering, Photonic Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089-0241, danrich@usc.edu
I. Mukhametzhanov
Affiliation:
Department of Materials Science and Engineering, Photonic Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089-0241, danrich@usc.edu
A. Madhukar
Affiliation:
Department of Materials Science and Engineering, Photonic Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089-0241, danrich@usc.edu
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Abstract

Cathodoluminescence wavelength imaging (CLWI) of InAs/GaAs self-assembled quantum dots (SAQDs) was performed to study the spatial variation in the spectral lineshape of the broadened quantum dot (QD) ensemble. The lineshape was found to vary on a scale of ∼μm, revealing attendant variations in the size distribution of SAQD clusters on this spatial scale. Energy variations in clusters of SAQDs are found to exhibit a spatial correlation with the efficiency of luminescence and the activation energy for thermal re-emission of carriers. A reduction in the energy variation of the QD clusters occurs when the thickness of the spacer layers in vertically self-organized samples is reduced or the number of stacks is increased. SAQDs were also prepared by punctuated island growth (PIG), in which deposition of the total desired amount is broken into two or more stages each separated by time delays. CLWI reveals a reduced variation in the energy of the dominant CL emission on a ∼μm spatial scale, correlating with a narrower size distribution of larger QDs for PIG, as measured in atomic force microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 618: Symposium K – Morphological & Compositional Evolution of Heteroepitaxial… , 2000 , 173
Copyright
Copyright © Materials Research Society 2000

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References

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