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Multifunctional oxides for integrated manufacturing of efficient graphene electrodes for organic electronics
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See supplementary material at http://dx.doi.org/10.1063/1.4908292
for Raman spectra showing degradation in quality of graphene underneath the MoO3
post-treated at 100 W for 60s O2
plasma treatment. XPS C1s and W4f data of graphene with a 15 nm WO3
protective layer.[Supplementary Material]
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Using multi-functional oxide films, we report on the development of an integration strategy for scalable manufacturing of graphene-based transparent conducting electrodes (TCEs) for organic electronics. A number of fundamental and process challenges exists for efficient graphene-based TCEs, in particular, environmentally and thermally stable doping, interfacial band engineering for efficient charge injection/extraction, effective wetting, and process compatibility including masking and patterning. Here, we show that all of these challenges can be effectively addressed at once by coating
graphene with a thin (>10 nm) metal oxide (MoO3 or WO3) layer. We demonstrate graphene
electrode patterning without the need for conventional lithography and thereby achieve organic light emitting diodes with efficiencies exceeding those of standard indium tin oxide reference devices.
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