LAUSR

Hybrid systems consisting of colloidal CdS/ZnS core shell quantum dots on ZnSe semiconductor substrates have been studied by continous-wave and nanosecond time-resolved photoluminescence. Depending on the size of the CdS cores the dominating transfer mechanism is changing. Comparing the photoluminescence transients of the dots with different diameter on ZnSe with respective results on ZnMnSe and quartz substrates we were able to reveal the dominant transfer mechanisms from the dots to ZnSe substrates. The considered transfer mechanisms being either resonance energy transfer, photon reabsorption and electron or hole tunneling. Finally, we were able to determine the conduction band offset between CdS and ZnSe to 0.56eV at 10K.