Electrically controlled fluorescence quenching of quantum dots on monolayer Molybdenum Disulfide -- Part I

We study hybrid electronic structures in which zero-dimensional semiconductor quantum dots (QDs) are coupled with two-dimensional monolayer molybdenum disulfide (MoS$_{2})$. To fabricate such devices, we mechanically transfer MoS$_{2}$ onto a sub-monolayer of QDs assembled on a functionalized glass surface. We investigate quenching of the fluorescence of QDs which are selectively synthesized to have emission spectra which overlaps with the excitonic absorption peak (2.1eV) in MoS$_{2}$. Both photoluminescence intensity and lifetime for QDs on MoS$_{2}$ decrease $\sim$ 5 times due to near-field energy transfer from QDs to MoS$_{2}$. Furthermore, by electrostatically gating MoS$_{2}$, we control the rate of energy transfer and modulate the photoluminescence intensity of QDs by $\sim$ 50{\%}.