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Dynamics of above-barrier state excitons in multi-stacked quantum dots

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4 Author(s)
Kojima, Osamu ; Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan ; Tobita, Naoki ; Kita, Takashi ; Akahane, Kouichi

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We report the relaxation dynamics from above-barrier exciton states to the lowest one in multi-stacked quantum dots (QDs). The photoluminescence decay time increases because of the excitation of higher exciton states, which is attributed to the wider miniband width of above-barrier excitons and the localization of the envelope functions in the barrier layers. The existence of the above barrier minibands makes carrier transport along the growth direction possible and eliminates a difficulty with close QD stacking. These results demonstrate an effective approach to achieve high efficiency QD devices.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 9 )