Ultrafast charge transfer and interlayer exciton formation in WSe2/WS2 and WSe2/graphene heterostructures

The ultrafast charge transfer and dynamical interlayer excitons were investigated in the heterostructures comprising WSe2/WS2 and WSe2/graphene bilayer. The results reveal the stacking order affect the charge transfer and therefore the formation of exciton in the heterostructure significantly.