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CdSe quantum dots (QDs) with different organic linker molecules are attachedto ZnO nanowires (NWs) to study the luminescence dynamics and the electrontunneling from the QDs to the nanowires in time-resolved photoluminescence (PL)and photoconductivity measurements. The PL transients of the QD luminescenceindicate two different recombination channels: the direct recombination insidethe QD core and the recombination via QD surface defect states. After linkingthe QDs to the ZnO NW surface, photo-induced electron tunneling from an excitedstate of the QD into the conduction band of the nanowire becomes visible by aclear decrease of the PL decay time. Efficient electron tunneling is confirmedby a strong enhancement of the photocurrent through the functionalizednanowires in which the tunneling rate can be controlled by using differentorganic linker molecules.

Electron tunneling from colloidal CdSe quantum dots to ZnO nanowires studied by time-resolved luminescence and photoconductivity experiments