The influence of a continuum background on photoluminescence of self-assembled InAlAs/AlGaAs quantum dots

We have investigated the effect of the low energy tail of the continuum states associated with wetting layers (WL tail) on temperature dependence of the photoluminescence (PL) spectra of self-assembled InAlAs/AlGaAs quantum dots. We have developed a model that studies this effect. The results of thi...

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Bibliographic Details
Published in:Journal of luminescence 2011-08, Vol.131 (8), p.1641-1644
Main Authors: Sellami, N., Melliti, A., Othmen, R., Maaref, M.A., Kuszelewiez, R., Lemaître, A.
Format: Article
Language:English
Subjects:
Aluminum gallium arsenides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Continuums
Evolution
Exact sciences and technology
InAlAs/AlGaAs
Luminescence
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Photoluminescence
Physics
Quantum dots
Spectra
Temperature
Temperature dependence
Wetting layers
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Summary:We have investigated the effect of the low energy tail of the continuum states associated with wetting layers (WL tail) on temperature dependence of the photoluminescence (PL) spectra of self-assembled InAlAs/AlGaAs quantum dots. We have developed a model that studies this effect. The results of this model suggest that the WL tail play an important role in the evolution according to the temperature of the PL spectra. We have also estimated that the capture into the QD ground state is via the WL tail. ► The evolution with the temperature of the QD PL is related to the WL tail. ► The capture into the QD ground states is via the WL tail. ► The deep of the WL tail decreases according to the QD emission energy.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2011.04.011