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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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