Journal
DIAMOND AND RELATED MATERIALS
Volume 38, Issue -, Pages 19-23Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2013.06.002
Keywords
Graphene; Field-effect transistor; Specific contact resistivity; Transfer characteristic; Double dip
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We study the contact resistance and the transfer characteristics of back-gated field effect transistors of mono- and bi-layer graphene. We measure specific contact resistivity of similar to 7 k Omega mu m(2) and similar to 30k Omega mu m(2) for Ni and Ti, respectively. We show that the contact resistance is a significant contributor to the total source-to-drain resistance and it is modulated by the back-gate voltage. We measure transfer characteristics showing a double dip feature that we explain as the effect of doping due to charge transfer from the contacts causing minimum density of states for graphene under the contacts and in the channel at different gate voltage. (c) 2013 Elsevier B.V. All rights reserved.
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