The carbon's solubility into copper is incredibly small and so largely surface area diffusion and nucleation of carbon atoms are involved. For this reason along with the growth kinetics, the graphene thickness is restricted to predominantly a monolayer. The large advantage would be that the graphene might be grown on https://www.quora.com/profile/Trevor-Flatcher-2/Advantages-of-Silicon-Carbide-Materials-in-High-Temperature-Electronic-Devices-Silicon-carbide-SiC-has-emerged-as-a-c