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InAs Quantum Dots Grown on an AlGaAsSb Strain-Relief Buffer

Published online by Cambridge University Press:  17 March 2011

A.L. Gray ,
L. R. Dawson ,
Y. Lin ,
A. Stintz ,
Y.-C. Xin ,
A.A. Garza  and
L. F. Lester
A.L. Gray
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
L. R. Dawson
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
Y. Lin
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
A. Stintz
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
Y.-C. Xin
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
A.A. Garza
Affiliation:
Department of Earth and Planetary Sciences (Geology), University of New Mexico
L. F. Lester
Affiliation:
Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, NM 87106
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Abstract

An In(Ga)As-based self-assembled quantum dot laser test structure grown on strain-relief Al0.5Ga0.5As1-ySby strain-relief buffer layers (0≤y ≤ 0.24) on a GaAs substrate is investigated in an effort to increase dot size and therefore extend the emission wavelength over conventional InAs quantum dots on GaAs platforms. Cross-section transmission electron microscopy, and high-resolution x-ray diffraction are used to monitor the dislocation filtering process and morphology in the buffer layers. Results show that the buffer layers act as an efficient dislocation filter by drastically reducing threading dislocations, thus providing a relaxed, low dislocation, compositionally modulated Al0.5Ga0.5Sb0.24As0.76 substrate for large (500Å height x 300Å width) defect -free InAs quantum dots. Photoluminescence shows a ground-state emission of the InAs quantum dots at 1.45 μm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 642: Symposium J – Semiconductor Quantum Dots II , 2000 , J3.22.1
Copyright
Copyright © Materials Research Society 2001

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References

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