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Poljak, Mirko; Matic, Mislav; Zeljko, Ante
IEEE transactions on electron devices, 09/2022, Volume: 69, Issue: 9Journal Article
Contact resistance strongly deteriorates the performance of devices based on 2-D materials and their nanostructures, masking their exceptional electronic and transport properties. This work explores the dependence of contact resistance (<inline-formula> <tex-math notation="LaTeX">{R}_{C} </tex-math></inline-formula>) of graphene nanoribbon (GNR) devices on contact geometry using atomistic quantum transport simulations. The influence and contributions of edge and top contacts and GNR width scaling on <inline-formula> <tex-math notation="LaTeX">{R}_{C} </tex-math></inline-formula> is studied in detail. Metallization effects on the density of states, transmission, and GNR field-effect transistor (GNR FET) driving current are investigated. We show that wider GNRs (~4 nm) exhibit edge-dominated transport and lower <inline-formula> <tex-math notation="LaTeX">{R}_{C} </tex-math></inline-formula> than the ultranarrow GNRs (~0.4 nm) that exhibit much higher contact resistance which is also dependent on the contact area.
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