Physical Insights on the Ambiguous Metal–Graphene Interface and Proposal for Improved Contact Resistance


The ambiguous behavior of metal–graphene interface has been addressed during this paper using density useful theory and nonequilibrium Green’s perform formalism. For the first time, the elemental chemistry of metal–graphene interface, in specific role of sp-hybridized and sp2-hybridized carbon atoms, has been emphasized and discussed well during this paper. It was discovered that the sp-hybridized sites at the edge of a graphene monolayer contribute to 40% of current conduction compared with sp2-hybridized atom sites within the graphene–metal overlap region. Moreover, we highlighted the insignificance of an extra metal layer, i.e., sandwiched contact, due to lacking sp-hybridized carbon sites. A elementary means of defining the contact resistance, while keeping chemical bonding in mind, has been proposed. The bonding insight has been more used to propose the novel ways that of interfacing metal with graphene, which ends up in a forty% reduction in touch resistance.

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