CUED Publications database

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

Lin, H and Braeuninger-Weimer, P and Kamboj, VS and Jessop, DS and Degl'Innocenti, R and Beere, HE and Ritchie, DA and Zeitler, JA and Hofmann, S (2017) Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy. Sci Rep, 7. 10625-.

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Abstract

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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 11 Sep 2017 20:06
Last Modified: 21 Sep 2017 01:36
DOI: