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In this work we test graphene electrodes in nano-metric channel n-typeOrganic Field EffectTransistors (OFETs) based on thermally evaporated thinfilms of perylene-3,4,9,10-tetracarboxylic acid diimide derivative (PDIF-CN2).By a thorough comparison with short channel transistors made with referencegold electrodes, we found that the output characteristics of the graphene-baseddevices respond linearly to the applied biases, in contrast with thesupra-linear trend of gold-based transistors. Moreover, short channel effectsare considerably suppressed in graphene electrodes devices. More specifically,current on/off ratios independent of the channel length (L) and enhancedresponse for high longitudinal biases are demonstrated for L down to ~140 nm.These results are rationalized taking into account the morphological andelectronic characteristics of graphene, showing that the use of grapheneelectrodes may help to overcome the problem of Space Charge Limited Current(SCLC) in short channel OFETs.

Linear conduction in N-type organic field effect transistors with nanometric channel lengths and graphene as electrodes