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In-situ terahertz optical Hall effect measurements of ambient effects on free charge carrier properties of epitaxial graphene
University of Nebraska, NE 68588 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. University of Nebraska, NE 68588 USA; University of N Carolina, NC 28223 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 5151Article in journal (Refereed) Published
Abstract [en]

Unraveling the doping-related charge carrier scattering mechanisms in two-dimensional materials such as graphene is vital for limiting parasitic electrical conductivity losses in future electronic applications. While electric field doping is well understood, assessment of mobility and density as a function of chemical doping remained a challenge thus far. In this work, we investigate the effects of cyclically exposing epitaxial graphene to controlled inert gases and ambient humidity conditions, while measuring the Lorentz force-induced birefringence in graphene at Terahertz frequencies in magnetic fields. This technique, previously identified as the optical analogue of the electrical Hall effect, permits here measurement of charge carrier type, density, and mobility in epitaxial graphene on silicon-face silicon carbide. We observe a distinct, nearly linear relationship between mobility and electron charge density, similar to field-effect induced changes measured in electrical Hall bar devices previously. The observed doping process is completely reversible and independent of the type of inert gas exposure.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 7, article id 5151
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-139563DOI: 10.1038/s41598-017-05333-wISI: 000405172600118PubMedID: 28698648OAI: oai:DiVA.org:liu-139563DiVA, id: diva2:1130090
Note

Funding Agencies|Swedish Research Council (VR) [2013-5580, 2016-00889]; Swedish Governmental Agency for Innovation Systems (VINNOVA) [2011-03486, 2014-04712]; Swedish Foundation for Strategic Research (SSF) [FFL12-0181, RIF14-055]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; National Science Foundation through the Center for Nanohybrid Functional Materials [EPS-1004094]; Nebraska Materials Research Science and Engineering Center [DMR-1420645, CMMI 1337856, EAR 1521428]

Available from: 2017-08-08 Created: 2017-08-08 Last updated: 2018-01-12

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