Abstract
By means of photoluminescence spectroscopy we compare the bias dependent emissions of single quantum dots which are embedded in two differently designed photodiode structures. Controlled single-electron charging allows to identify neutral, single- and double-charged excitons in the optical spectra of both samples. The strength of the tunneling coupling between the quantum dots and the diode's n region is found to have a strong influence on the observed spectral features---in particular, the parallel appearance of emission lines resulting from the radiative decay of differently charged quantum dot states is suppressed in case of strong tunneling interaction.
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