Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy

We demonstrate how terahertz time-domain spectroscopy (THz-TDS) operating in reflection geometry can be used for quantitative conductivity mapping of large area chemical vapour deposited graphene films on sapphire, silicon dioxide/silicon and germanium. We validate the technique against measurements...

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Autores principales: Lin, Hungyen, Braeuninger-Weimer, Philipp, Kamboj, Varun S., Jessop, David S., Degl’Innocenti, Riccardo, Beere, Harvey E., Ritchie, David A., Zeitler, J. Axel, Hofmann, Stephan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5587735/
https://www.ncbi.nlm.nih.gov/pubmed/28878213
http://dx.doi.org/10.1038/s41598-017-09809-7
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author Lin, Hungyen
Braeuninger-Weimer, Philipp
Kamboj, Varun S.
Jessop, David S.
Degl’Innocenti, Riccardo
Beere, Harvey E.
Ritchie, David A.
Zeitler, J. Axel
Hofmann, Stephan
author_facet Lin, Hungyen
Braeuninger-Weimer, Philipp
Kamboj, Varun S.
Jessop, David S.
Degl’Innocenti, Riccardo
Beere, Harvey E.
Ritchie, David A.
Zeitler, J. Axel
Hofmann, Stephan
author_sort Lin, Hungyen
collection PubMed
description We demonstrate how terahertz time-domain spectroscopy (THz-TDS) operating in reflection geometry can be used for quantitative conductivity mapping of large area chemical vapour deposited graphene films on sapphire, silicon dioxide/silicon and germanium. We validate the technique against measurements performed with previously established conventional transmission based THz-TDS and are able to resolve conductivity changes in response to induced back-gate voltages. Compared to the transmission geometry, measurement in reflection mode requires careful alignment and complex analysis, but circumvents the need of a terahertz transparent substrate, potentially enabling fast, contactless, in-line characterisation of graphene films on non-insulating substrates such as germanium.
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spelling pubmed-55877352017-09-13 Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy Lin, Hungyen Braeuninger-Weimer, Philipp Kamboj, Varun S. Jessop, David S. Degl’Innocenti, Riccardo Beere, Harvey E. Ritchie, David A. Zeitler, J. Axel Hofmann, Stephan Sci Rep Article We demonstrate how terahertz time-domain spectroscopy (THz-TDS) operating in reflection geometry can be used for quantitative conductivity mapping of large area chemical vapour deposited graphene films on sapphire, silicon dioxide/silicon and germanium. We validate the technique against measurements performed with previously established conventional transmission based THz-TDS and are able to resolve conductivity changes in response to induced back-gate voltages. Compared to the transmission geometry, measurement in reflection mode requires careful alignment and complex analysis, but circumvents the need of a terahertz transparent substrate, potentially enabling fast, contactless, in-line characterisation of graphene films on non-insulating substrates such as germanium. Nature Publishing Group UK 2017-09-06 /pmc/articles/PMC5587735/ /pubmed/28878213 http://dx.doi.org/10.1038/s41598-017-09809-7 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Lin, Hungyen
Braeuninger-Weimer, Philipp
Kamboj, Varun S.
Jessop, David S.
Degl’Innocenti, Riccardo
Beere, Harvey E.
Ritchie, David A.
Zeitler, J. Axel
Hofmann, Stephan
Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title_full Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title_fullStr Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title_full_unstemmed Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title_short Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
title_sort contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5587735/
https://www.ncbi.nlm.nih.gov/pubmed/28878213
http://dx.doi.org/10.1038/s41598-017-09809-7
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