Journal
ACS NANO
Volume 4, Issue 1, Pages 43-48Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900728d
Keywords
graphene; OLED; transparent conductor; outcoupling; solution-processed
Categories
Funding
- National Science Foundation
- Global Climate and Energy Project at Stanford (GCEP)
- Center for Advanced Molecular Photovoltaics (CAMP) [KUS-C1-015-21]
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Theoretical estimates indicate that graphene thin films can be used as transparent electrodes for thin-film devices such as solar cells and organic light-emitting diodes, with an unmatched combination of sheet resistance and transparency, We demonstrate organic light-emitting diodes with solution-processed graphene thin film transparent conductive anodes. The graphene electrodes were deposited on quartz substrates by spin-coating of an aqueous dispersion of functionalized graphene, followed by a vacuum anneal step to reduce the sheet resistance. Small molecular weight organic materials and a metal cathode were directly deposited on the graphene anodes, resulting in devices with a performance comparable to control devices on indium-tin-oxide transparent anodes. The outcoupling efficiency of devices on graphene and indium-tin-oxide is nearly identical, in agreement with model predictions.
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