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Proposal for all-graphene monolithic logic circuits

Since the very inception of integrated circuits, dissimilar materials have been used for fabricating devices and interconnects. Typically, semiconductors are used for devices and metals are used for interconnecting them. This, however, leads to a “contact resistance” between them that degrades device and circuit performance, especially for nanoscale technologies. This letter introduces and explores an “all-graphene” device-interconnect co-design scheme, where a single 2-dimensional sheet of monolayer graphene is proposed to be monolithically patterned to form both active devices (graphene nanoribbon tunnel-field-effect-transistors) as well as interconnects in a seamless manner. Thereby, the use of external contacts is alleviated, resulting in substantial reduction in contact parasitics. Calculations based on tight-binding theory and Non-Equilibrium Green's Function (NEGF) formalism solved self-consistently with the Poisson's equation are used to analyze the intricate properties of the proposed structure. ...