Open Access Highly Accessed Nano Express

Conductance of Graphene Nanoribbon Junctions and the Tight Binding Model

Y Wu and PA Childs*

Author Affiliations

School of Electronic, Electrical and Computer Engineering, University of Birmingham, B15 2TT, Birmingham, UK

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Nanoscale Res Lett 2011, 6:62  doi:10.1007/s11671-010-9791-y

Published: 7 October 2010

Abstract

Planar carbon-based electronic devices, including metal/semiconductor junctions, transistors and interconnects, can now be formed from patterned sheets of graphene. Most simulations of charge transport within graphene-based electronic devices assume an energy band structure based on a nearest-neighbour tight binding analysis. In this paper, the energy band structure and conductance of graphene nanoribbons and metal/semiconductor junctions are obtained using a third nearest-neighbour tight binding analysis in conjunction with an efficient nonequilibrium Green's function formalism. We find significant differences in both the energy band structure and conductance obtained with the two approximations.

Keywords:
Graphene nanoribbon junction; Tight binding; Conductance; Band structure