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Controlling Growth of InAs/GaAs Self-Assembled Quantum Dots to Give 1.3 μm Room Temperature Emission

Published online by Cambridge University Press:  10 February 2011

Surama Malik ,
Philip Siverns ,
David Childs ,
Christine Roberts ,
Jean-Michel Hartmann  and
Ray Murray
Surama Malik
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
Philip Siverns
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
David Childs
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
Christine Roberts
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
Jean-Michel Hartmann
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
Ray Murray
Affiliation:
Centre for Electronic Materials and Devices, Blackett Laboratory, Imperial College, London, UK
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Abstract

We have investigated the extent to which the emission wavelength of self-assembled InAs/GaAs quantum dots can be controlled by growth parameters using conventional solid source MBE. Changing from conventionally high growth rates to a very low growth rate (LGR) and a relatively high substrate temperature, tunes the photoluminescence (PL) emission from 1.1 μm to 1.3 μm at room temperature. Atomic force micrographs obtained from uncapped samples reveal that these LGRQDs are larger, lower in density and extremely uniform in size. The improved size uniformity is reflected in the reduction of the PL linewidth from 78 meV to 22 meV. Under conditions of high excitation, emission from the ground and two excited states each separated by ∼70 meV is observed. This implies a parabolic confining potential. Time resolved photoluminescence (TRPL) measurements of dots grown under the various growth conditions yield radiative lifetimes which reflect the depth of the confining potential. A comparison of the decay times measured for the excited states show that the relaxation of carriers within the dots cannot be ascribed to phonon effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 571: Symposium W – Semiconductor Quantum Dots , 1999 , 273
Copyright
Copyright © Materials Research Society 2000

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References

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