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In recent years, many researchers have been developing
graphene-based applications for transparent electrodes such as
organic thin-film transistors (OTFT) [48], touchscreen [30],
LEDs [49, 50], solar cells [51] and smart windows [5].
Figure 7(a) shows schematically the process of patterning
graphene using photo-lithography and ultimately making
transparent pentacene¨Cgraphene field effect transistor devices.
When the graphene layer is used as the electrode and an
organic material such as pentacene is used as the active
layer, it shows about 100 times lower contact resistance
and higher electron mobility than when Au is used as
the electrode (figures 7(b) and (c)). As presented, low
contact resistance between graphene electrodes and organic
materials allows the production of transparent devices with
improved performance. Figures 7(d) and (e) show the
first successful application of graphene in touchscreens as
a transparent electrode component. This shows excellent
potential for applications to flexible transparent electronic
devices. Although the practical device application is still at
lab-bench scale, commercial scale adaptation of graphene as
a transparent electrode does not seem far way.

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