Browsing by Subject "Silicon through"

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    Excitonic enhancement of nonradiative energy transfer to bulk silicon with the hybridization of cascaded quantum dots
    (AIP, 2013) Yeltik A.; Guzelturk, B.; Hernandez-Martinez, P. L.; Akhavan S.; Demir, Hilmi Volkan
    We report enhanced sensitization of silicon through nonradiative energy transfer (NRET) of the excitons in an energy-gradient structure composed of a cascaded bilayer of green- and red-emitting CdTe quantum dots (QDs) on bulk silicon. Here NRET dynamics were systematically investigated comparatively for the cascaded energy-gradient and mono-dispersed QD structures at room temperature. We show experimentally that NRET from the QD layer into silicon is enhanced by 40% in the case of an energy-gradient cascaded structure as compared to the mono-dispersed structures, which is in agreement with the theoretical analysis based on the excited state population-depopulation dynamics of the QDs. © 2013 AIP Publishing LLC.