Physics – Condensed Matter – Materials Science
Scientific paper
2010-04-12
Jpn. J. Appl. Phys. 2010
Physics
Condensed Matter
Materials Science
Scientific paper
The intrinsic channel properties of monolayer and multilayer graphene were systematically investigated as a function of layer number by the exclusion of contact resistance using four-probe measurements. We show that the continuous change in normalized sheet resistivity from graphite to a bilayer graphene is governed by one unique property, i.e., the band overlap, which markedly increases from 1 meV for a bilayer graphene to 11 meV for eight layers and eventually reaches 40 meV for graphite. The monolayer graphene, however, showed a deviation in temperature dependence due to a peculiar linear dispersion. Additionally, contact resistivity was extracted for the case of typical Cr/Au electrodes. The observed high contact resistivity, which varies by three orders of magnitude (from ~103 to 106 Ohm micron), might significantly mask the outstanding performance of the monolayer graphene channel, suggesting its importance in future research.
Kita Koji
Nagashio Kosuke
Nishimura Tomonori
Toriumi Akira
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