Correlating atomic structure and transport in suspended graphene nanoribbons
Por:
Qi Z.J., Rodríguez-Manzo J.A., Botello-Méndez A.R., Hong S.J., Stach E.A., Park Y.W., Charlier J.-C., Drndic M., Johnson A.T.C.
Publicada:
1 ene 2014
Resumen:
Graphene nanoribbons (GNRs) are promising candidates for next generation integrated circuit (IC) components; this fact motivates exploration of the relationship between crystallographic structure and transport of graphene patterned at IC-relevant length scales (<10 nm). We report on the controlled fabrication of pristine, freestanding GNRs with widths as small as 0.7 nm, paired with simultaneous lattice-resolution imaging and electrical transport characterization, all conducted within an aberration-corrected transmission electron microscope. Few-layer GNRs very frequently formed bonded-bilayers and were remarkably robust, sustaining currents in excess of 1.5 µA per carbon bond across a 5 atom-wide ribbon. We found that the intrinsic conductance of a sub-10 nm bonded bilayer GNR scaled with width as G BL (w) ˜ 3/4(e 2 /h)w, where w is the width in nanometers, while a monolayer GNR was roughly five times less conductive. Nanosculpted, crystalline monolayer GNRs exhibited armchair-terminated edges after current annealing, presenting a pathway for the controlled fabrication of semiconducting GNRs with known edge geometry. Finally, we report on simulations of quantum transport in GNRs that are in qualitative agreement with the observations. © 2014 American Chemical Society.
Filiaciones:
Qi Z.J.:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, United States
Rodríguez-Manzo J.A.:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, United States
Botello-Méndez A.R.:
Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des étoiles 8, 1348 Louvain-la-Neuve, Belgium
Hong S.J.:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, United States
Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-747, South Korea
Stach E.A.:
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, United States
Park Y.W.:
Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-747, South Korea
Charlier J.-C.:
Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des étoiles 8, 1348 Louvain-la-Neuve, Belgium
Drndic M.:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, United States
Johnson A.T.C.:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, United States
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