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. 2015 Jun 18;6:7478. doi: 10.1038/ncomms8478

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(a) Representative I–V curves of rGO-only junctions and junctions based on PPE and TTF–PPE ultrathin films. (b–e) Fowler–Nordheim plots for I–V traces of junctions based on (b) C12, (c) OPE3, (d) PPE and (e) TTF–PPE. Two distinct regimes (I and II) are clearly observable in c, d and e with a minimum at V_trans. Insets of d and e show log–log plot of representative I–V traces for PPE and TTF–PPE junctions.