The study of the interactions between graphene and Ge(001)/Si(001)

摘要: The interaction between graphene and germanium surfaces was investigated using a combination of microscopic macroscopic experimental techniques complementary theoretical calculations. Density functional theory (DFT) calculations for different reconstructions the Ge(001) surface showed that interactions introduce additional peaks in density states, superimposed on valence conduction energy bands. growth induces nanofaceting surface, which exhibits well-organized hill valley structures. regions covered by hills are high quality exhibit an almost linear dispersion relation, indicates weak graphene–germanium interactions. On other hand, component occupying is significantly perturbed with germanium. It also found stronger observed connected lower local electrical conductivity. Annealing graphene/Ge(001)/Si(001) performed to obtain more uniform surface. This process results characterized negligible structures; however, properties unexpectedly deteriorated increasing uniformity To sum up, it shown mechanism responsible formation conductivity inhomogeneities covering related strength present indicate that, order high-quality graphene, efforts should focus limiting can be achieved adjusting conditions.