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Anomalous length scaling of carbon nanotube-metal contact resistance: An ab initio study

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2 Author(s)
Kim, Yong-Hoon ; Graduate School of EEWS and KI for NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea ; Sung Kim, Hu

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Employing open-ended carbon nanotubes (CNTs) with and without hydrogen termination, we study the length scaling of metal-CNT contact resistance and its correlation with chemical bonding from first principles. Both models similarly show a transition from the fast-growing short-length scaling to the slow-growing long-length scaling. However, while the hydrogenated CNTs have much lower short-length resistances than H-free CNTs, Schottky barrier of the former is almost twice thicker and its eventual long-length-limit resistance becomes significantly higher. This demonstrates the critical role of atomistic details in metal-CNT contacts and localized CNT edge states for the Schottky barrier shape and metal-induced gap states.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 21 )