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Optical Properties of Multi-Stacked InAs Quantum Dots Embedded in GaAs/InGaAs Strained Layer and its Annealing Behaviors

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Kim D., Kim G., Jeon S., Cho M., Choi H., Kim M., Lee D., Kim J., Kim J., Eom G., Leem J.
Acta Physica Polonica A
|
2010
|
vol. 117
|
issue 6
941-944
EN
Multi-stacked InAs QDs embedded in ten periods of GaAs/In_{0.1}Ga_{0.9}As strained layers were grown by MBE and their optical properties were investigated by using PL spectroscopy. For the QDs embedded in ten periods of GaAs/In_{0.1}Ga_{0.9}As strained layers, the PL intensity is enhanced about 4.7 times and a narrower FWHM of 26 meV is observed compared to those of the conventional multi-stacked QDs. The PL spectra of the InAs QDs show blue-shifts of about 50 meV with increasing annealing temperature up to 850°C. At annealing temperature of 600°C, the FWHM of the PL peak is reduced to 16 meV and PL intensity is enhanced compared to those of the as-grown sample, which indicates improvement of size uniformity and crystal quality of the QDs.
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