The effect of bilayer regions on the response of epitaxial graphene devices to environmental gating. / Pearce, Ruth ; Eless, Viktoria; Lartsev, Arseniy; Barker Snook, I.L.; Helmore, J.J.; Yakimova, Rositza ; Gallop, J.C.; Hao, Ling.
In: Carbon, Vol. 93, 11.2015, p. 896-902.Research output: Contribution to journal › Article › peer-review
The effect of bilayer regions on the response of epitaxial graphene devices to environmental gating. / Pearce, Ruth ; Eless, Viktoria; Lartsev, Arseniy; Barker Snook, I.L.; Helmore, J.J.; Yakimova, Rositza ; Gallop, J.C.; Hao, Ling.
In: Carbon, Vol. 93, 11.2015, p. 896-902.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - The effect of bilayer regions on the response of epitaxial graphene devices to environmental gating
AU - Pearce, Ruth
AU - Eless, Viktoria
AU - Lartsev, Arseniy
AU - Barker Snook, I.L.
AU - Helmore, J.J.
AU - Yakimova, Rositza
AU - Gallop, J.C.
AU - Hao, Ling
PY - 2015/11
Y1 - 2015/11
N2 - 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.
AB - 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.
U2 - 10.1016/j.carbon.2015.05.061
DO - 10.1016/j.carbon.2015.05.061
M3 - Article
VL - 93
SP - 896
EP - 902
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -