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dc.contributor.authorLin, Hungyenen
dc.contributor.authorBraeuninger-Weimer, Philippen
dc.contributor.authorKamboj, Varun Sen
dc.contributor.authorJessop, David Sen
dc.contributor.authorDegl'Innocenti, Riccardoen
dc.contributor.authorBeere, Harveyen
dc.contributor.authorRitchie, Daviden
dc.contributor.authorZeitler, Axelen
dc.contributor.authorHofmann, Stephanen
dc.date.accessioned2018-03-16T18:41:55Z
dc.date.available2018-03-16T18:41:55Z
dc.date.issued2017-09-06en
dc.identifier.issn2045-2322
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/274072
dc.description.abstractWe 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.
dc.description.sponsorshipH.L. and J.A.Z. acknowledge financial support from the EPSRC (Grant No. EP/L019922/1). P.B.W. acknowledges EPSRC Cambridge NanoDTC EP/G037221/1. R.D., H.E.B. and D. R. acknowledge financial support from the EPSRC (Grant No. EP/J017671/1, Coherent Terahertz Systems). S.H. acknowledges funding from the EPSRC (Grant No. EP/K016636/1, GRAPHTED).
dc.languageengen
dc.publisherNature Publishing Group
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleContactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy.en
dc.typeArticle
prism.issueIdentifier1en
prism.number10625en
prism.publicationDate2017en
prism.publicationNameScientific Reportsen
prism.volume7en
dc.identifier.doi10.17863/CAM.21156
dcterms.dateAccepted2017-08-07en
rioxxterms.versionofrecord10.1038/s41598-017-09809-7en
rioxxterms.versionVoR*
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2017-09-06en
dc.contributor.orcidBraeuninger-Weimer, Philipp [0000-0001-8677-1647]
dc.contributor.orcidDegl'Innocenti, Riccardo [0000-0003-2655-1997]
dc.contributor.orcidBeere, Harvey [0000-0001-5630-2321]
dc.contributor.orcidRitchie, David [0000-0002-9844-8350]
dc.contributor.orcidZeitler, Axel [0000-0002-4958-0582]
dc.contributor.orcidHofmann, Stephan [0000-0001-6375-1459]
dc.identifier.eissn2045-2322
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idUNIVERSITY COLLEGE LONDON (FB EPSRC) (EP/J017671/1)
pubs.funder-project-idEPSRC (via University of Leeds) (EP/P021859/1)
pubs.funder-project-idEPSRC (EP/L019922/1)
pubs.funder-project-idEPSRC (EP/K016636/1)
pubs.funder-project-idEPSRC (EP/G037221/1)
cam.issuedOnline2017-09-06en


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International