Figure 4. Electron transfer mechanism in Au-MoS₂ hybrid nanoflake.

(a) The energy band diagram for MoS₂ and Au shows the relative positions of Fermi level with respect to vacuum level before establishing a contact. The direction of the arrow represents the transfer of electrons from MoS₂ to Au after the contact is established, (b) The energy band diagram of Au-MoS₂ showing band bending after establishing the contact between Au and MoS₂. Electron transfer from MoS₂ to Au causes p-doping and PL quenching.