Abstract
Using the photon interdetection time analysis method, we investigated the influence of Nb doping in a TiO2 substrate on the excited- and trap-state dynamics of single quantum dots (QDs) on the TiO2 substrate. From the results, we observed that although the lifetime of the excited state remained almost unchanged, the blinking behavior and the recovery rate from the trap state were modified depending on the Nb concentration. Therefore, we conjectured that these observed phenomena could be ascribed to the change in the electron density in the TiO2 substrate, which would cause the single QDs to change from the positive charged state back to the neutral state.
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