The effect of bilayer regions on the response of epitaxial graphene devices to environmental gating
2015 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 93, 896-902 p.Article in journal (Refereed) Published
The effect of a bilayer area on the electronic response to environmental gating of a monolayer graphene Hall bar device is investigated using room temperature magnetotransport and scanning Kelvin probe microscopy measurements in a controlled environment. The device is tuned through the charge neutrality point with n-p-n-junctions formed. Scanning Kelvin probe measurements show that the work function of the monolayer graphene decreases more than that of the bilayer area however magnetotransport measurements show a larger change in carrier concentration for bilayer graphene with environmental gating. Interface scattering at the boundary between the monolayer and bilayer regions also affects device response with field-dependent suppression of the conductivity observed near the charge neutrality point. Simultaneous electronic and environmental scanning Kelvin probe measurements are used to build nano-scale maps of the work function of the device surface revealing the areas of greatest work function change with environmental gating. Crown Copyright (C) 2015 Published by Elsevier Ltd. All rights reserved.
Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2015. Vol. 93, 896-902 p.
IdentifiersURN: urn:nbn:se:liu:diva-121418DOI: 10.1016/j.carbon.2015.05.061ISI: 000360292100091OAI: oai:DiVA.org:liu-121418DiVA: diva2:855149
Funding Agencies|UK NMS Programme; EU; EMRP the participating countries within EURAMET; European Union; European Union ; UK Department for Business, Innovation and Skills (BIS) in Sensor networks: data to knowledge [IRD/2013/09]; graphene flagship2015-09-182015-09-182015-10-28