Figure 6
Ultraviolet photoelectron spectroscopy (UPS) spectra and schematic energy diagrams of pentacene on (a) graphene electrode and (b) Au electrode.
A 10-nm-thick of pentacene was deposited on graphene and Au electrodes. Lines have been shifted vertically for clarity. The work function of each electrode and hole injection barrier at each interface were estimated from measured UPS values. Lines have been shifted vertically for clarity. (c) Transfer characteristics of OTS-treated graphene-electrode pentacene and Au-electrode pentacene FETs at a fixed VD of −90 V (channel length: 100 μm). (d) Output characteristics of OTS-treated graphene-electrode pentacene FETs (channel length: 100 μm).
