Energy Transfer Dynamics of CdTe Quantum Dots on Epitaxial Graphene Prepared by Si Sublimation of 4H-SiC(0001)

We prepared high quality and single- or bilayer graphene by Si sublimation method from 4H-SiC. The exciton relaxation dynamics of CdTe quantum dots (QDs) on epitaxial graphene was analyzed by picosecond single-photon timing spectroscopy, and the fast component was estimated to be 49 ps. This lifetime is in good agreement with the values calculated from Persson–Lang model (59 ps) and Swathi–Sebastian model (36 ps) of energy transfer, suggesting that the dominant process is energy transfer from CdTe QDs to graphene.