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Up-scalable ITO-free organic light emitting diodes based on embedded inkjet-printed copper grids

: Pozov, S.M.; Schider, G.; Voigt, S.; Ebert, F.; Popovic, K.; Hermerschmidt, F.; Georgiou, E.; Burgués-Ceballos, I.; Kinner, L.; Nees, D.; Stadlober, B.; Rapley, C.; Ward, R.; Choulis, S.A.; List-Kratochvil, E.J.W.; Boeffel, C.


Flexible and printed electronics 4 (2019), No.2, Art.025004, 12 pp.
ISSN: 2058-8585
European Commission EC
604568; PLASMAS
Journal Article
Fraunhofer IAP ()

We report on ITO-free OLEDS with a transparent hybrid Cu nanoparticle grid/PEDOT:PSS electrode processed in ambient conditions. An experimentally based methodology was implemented, where studies on alternative PEDOT:PSS derivatives and Cu grid design were performed, to gradually increase the efficiency of lab scale ITO-free OLEDs. To further increase electrode performance, inkjet-printed (IJP) Cu-grids are embedded to flatten the electrode, reduce leakage current and enhance homogeneity and efficiency. Finally, embedded Cu based ITO-free OLEDs showed current and power efficiencies comparable to reference ITO-based OLEDs. Methods to manufacture large area flat embedded IJP Cu-electrodes on glass and flexible substrates are presented and upscaling prospects of the proposed ITO-free electrode are discussed.