The epitaxial-graphene/graphene-oxide junction, an essential step towards epitaxial graphene electronics

Abstract

Graphene oxide (GO) flakes have been deposited to bridge the gap between two epitaxial graphene electrodes to produce all-graphene devices. Electrical measurements indicate the presence of Schottky barriers (SB) at the graphene/graphene oxide junctions, as a consequence of the band-gap in GO. The barrier height is found to be about 0.7 eV, and is reduced after annealing at 180 ${}^{\circ }$C, implying that the gap can be tuned by changing the degree of oxidation. A lower limit of the GO mobility was found to be 850 cm${}^2$/Vs, rivaling silicon. {\it In situ} local oxidation of patterned epitaxial graphene has been achieved.

5 pages, 4 figures

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