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

• Published in: Journal of luminescence Vol. 131; no. 8; pp. 1641 - 1644
• Main Authors: Sellami, N., Melliti, A., Othmen, R., Maaref, M.A., Kuszelewiez, R., Lemaître, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2011; Elsevier
• 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; Temperature; Quantum dots; InAlAs/AlGaAs; Wetting layers; Photoluminescence; Integrated intensity; Wetting; Aluminium Gallium Arsenides Mixed; Aluminium Indium Arsenides Mixed; Self-assembled layers; Continuum; Rate equation; Activation energy
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2011.04.011

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.