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Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC

Micro-Raman and micro-transmission imaging experiments have been done on epitaxial graphene grown on the C- and Si-faces of on-axis 6H-SiC substrates. On the C-face it is shown that the SiC sublimation process results in the growth of long and isolated graphene ribbons (up to 600 μm) that are strain...

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Detalles Bibliográficos
Autores principales: Tiberj, Antoine, Camara, Nicolas, Godignon, Philippe, Camassel, Jean
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211991/
https://www.ncbi.nlm.nih.gov/pubmed/21801347
http://dx.doi.org/10.1186/1556-276X-6-478
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author Tiberj, Antoine
Camara, Nicolas
Godignon, Philippe
Camassel, Jean
author_facet Tiberj, Antoine
Camara, Nicolas
Godignon, Philippe
Camassel, Jean
author_sort Tiberj, Antoine
collection PubMed
description Micro-Raman and micro-transmission imaging experiments have been done on epitaxial graphene grown on the C- and Si-faces of on-axis 6H-SiC substrates. On the C-face it is shown that the SiC sublimation process results in the growth of long and isolated graphene ribbons (up to 600 μm) that are strain-relaxed and lightly p-type doped. In this case, combining the results of micro-Raman spectroscopy with micro-transmission measurements, we were able to ascertain that uniform monolayer ribbons were grown and found also Bernal stacked and misoriented bilayer ribbons. On the Si-face, the situation is completely different. A full graphene coverage of the SiC surface is achieved but anisotropic growth still occurs, because of the step-bunched SiC surface reconstruction. While in the middle of reconstructed terraces thin graphene stacks (up to 5 layers) are grown, thicker graphene stripes appear at step edges. In both the cases, the strong interaction between the graphene layers and the underlying SiC substrate induces a high compressive thermal strain and n-type doping.
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spelling pubmed-32119912011-11-09 Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC Tiberj, Antoine Camara, Nicolas Godignon, Philippe Camassel, Jean Nanoscale Res Lett Nano Express Micro-Raman and micro-transmission imaging experiments have been done on epitaxial graphene grown on the C- and Si-faces of on-axis 6H-SiC substrates. On the C-face it is shown that the SiC sublimation process results in the growth of long and isolated graphene ribbons (up to 600 μm) that are strain-relaxed and lightly p-type doped. In this case, combining the results of micro-Raman spectroscopy with micro-transmission measurements, we were able to ascertain that uniform monolayer ribbons were grown and found also Bernal stacked and misoriented bilayer ribbons. On the Si-face, the situation is completely different. A full graphene coverage of the SiC surface is achieved but anisotropic growth still occurs, because of the step-bunched SiC surface reconstruction. While in the middle of reconstructed terraces thin graphene stacks (up to 5 layers) are grown, thicker graphene stripes appear at step edges. In both the cases, the strong interaction between the graphene layers and the underlying SiC substrate induces a high compressive thermal strain and n-type doping. Springer 2011-07-29 /pmc/articles/PMC3211991/ /pubmed/21801347 http://dx.doi.org/10.1186/1556-276X-6-478 Text en Copyright ©2011 Tiberj et al; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nano Express
Tiberj, Antoine
Camara, Nicolas
Godignon, Philippe
Camassel, Jean
Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title_full Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title_fullStr Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title_full_unstemmed Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title_short Micro-Raman and micro-transmission imaging of epitaxial graphene grown on the Si and C faces of 6H-SiC
title_sort micro-raman and micro-transmission imaging of epitaxial graphene grown on the si and c faces of 6h-sic
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211991/
https://www.ncbi.nlm.nih.gov/pubmed/21801347
http://dx.doi.org/10.1186/1556-276X-6-478
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