Abstract
The influence of local charge separation in self-organized In(Ga)As/GaAs quantum dots (QDs) on the exciton dynamics under resonant excitation of the confined exciton in the first excited state is investigated by time-resolved photoluminescence spectroscopy. The oscillator strength and the relaxation rate are shown to depend oppositely on the charge separation, which again depends on the shape and composition profile. A pronounced phonon bottleneck effect is demonstrated for excitons in flat, truncated QDs, whereas recombination-limited dynamics are observed for QDs favouring local charge separation. The results point out possible pathways for optimizing such QDs for device applications.
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