Hybrid graphene/organic semiconductor field-effect transistors

In this letter, we report on the improvement of the electronic properties of graphene by capping with pi-conjugated organic semiconductor molecules. The off-state current is reduced while the on-state current and mobility are either unaffected or increased. The semiconductors employed included alpha-sexithiophene and hexadecafluorocopperphthallocyanine. Removal of the organic semiconductor layer results in a return to the original electronic properties. This suggests that weak electronic interactions with organic semiconductors can be a promising approach to favorably alter the transport properties of graphene. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737939]