Graphene Quantum Dots Doping of MoS2 Monolayers.

Li, Ziwei; Ye, Ruquan; Feng, Rui; Kang, Yimin; Zhu, Xing; Tour, James M; Fang, Zheyu · Adv Mater · 2015

basic_science · Level V

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Abstract

Graphene quantum dots (GQDs) interacting with molybdenum disulfide (MoS2 ) monolayers induce an effective photoexcited charge transfer at the interface. Both the photoluminescence (PL) and valley polarization of this GQDs/MoS2 heterostructure can be modulated under various doping charge densities. The photon-exciton interaction is used to explain and calculate the heterostructure PL control, and is further applied to the valley-polarization tuning.