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Issue 11, 2019
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Alignment of semiconducting graphene nanoribbons on vicinal Ge(001)

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Abstract

Chemical vapor deposition of CH4 on Ge(001) can enable anisotropic growth of narrow, semiconducting graphene nanoribbons with predominately smooth armchair edges and high-performance charge transport properties. However, such nanoribbons are not aligned in one direction but instead grow perpendicularly, which is not optimal for integration into high-performance electronics. Here, it is demonstrated that vicinal Ge(001) substrates can be used to synthesize armchair nanoribbons, of which ∼90% are aligned within ±1.5° perpendicular to the miscut. When the growth rate is slow, graphene crystals evolve as nanoribbons. However, as the growth rate increases, the uphill and downhill crystal edges evolve asymmetrically. This asymmetry is consistent with stronger binding between the downhill edge and the Ge surface, for example due to different edge termination as shown by density functional theory calculations. By tailoring growth rate and time, nanoribbons with sub-10 nm widths that exhibit excellent charge transport characteristics, including simultaneous high on-state conductance of 8.0 μS and a high on/off conductance ratio of 570 in field-effect transistors, are achieved. Large-area alignment of semiconducting ribbons with promising charge transport properties is an important step towards understanding the anisotropic nanoribbon growth and integrating these materials into scalable, future semiconductor technologies.

Graphical abstract: Alignment of semiconducting graphene nanoribbons on vicinal Ge(001)

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Supplementary files

Article information


Submitted
23 Jan 2019
Accepted
21 Feb 2019
First published
22 Feb 2019

Nanoscale, 2019,11, 4864-4875
Article type
Paper
Author version available

Alignment of semiconducting graphene nanoribbons on vicinal Ge(001)

R. M. Jacobberger, E. A. Murray, M. Fortin-Deschênes, F. Göltl, W. A. Behn, Z. J. Krebs, P. L. Levesque, D. E. Savage, C. Smoot, M. G. Lagally, P. Desjardins, R. Martel, V. Brar, O. Moutanabbir, M. Mavrikakis and M. S. Arnold, Nanoscale, 2019, 11, 4864 DOI: 10.1039/C9NR00713J

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