Abstract
We present photoluminescence (PL) studies on quantum islands formed below the critical thickness for Stranski-Krastanow growth by a well-defined incorporation of Be nucleation centers in CdSe/ZnSe heterostructures. The occurrence of spectrally narrow, individual photoluminescence peaks in spatially resolved PL spectra and a significant enhancement of the recombination lifetime clearly indicate the presence of zero-dimensional states. A direct comparison of temperature-dependent single dot measurements with optical studies on quantum dot (QD) ensembles demonstrates an efficient coupling between individual QD's at elevated temperatures.
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