title: Engineering high charge transfer n-doping of graphene electrodes and its application to organic electronics.
abstract: Using thermally evaporated cesium carbonate (Cs2CO3) in an organic matrix, we present a novel strategy for efficient n-doping of monolayer graphene and a ∼90% reduction in its sheet resistance to ∼250 Ohm sq(-1). Photoemission spectroscopy confirms the presence of a large interface dipole of ∼0.9 eV between graphene and the Cs2CO3/organic matrix. This leads to a strong charge transfer based doping of graphene with a Fermi level shift of ∼1.0 eV. Using this approach we demonstrate efficient, standard industrial manufacturing process compatible graphene-based inverted organic light emitting diodes on glass and flexible substrates with efficiencies comparable to those of state-of-the-art ITO based devices.
authors.affiliation: Philips Research, Philipsstrasse 8, 52068 Aachen, Germany. Jens.Meyer@philips.com.
authors.forename: Simon
authors.initials: S
authors.lastname: Sanders
authors.forename: Andrea
authors.initials: A
authors.lastname: Cabrero-Vilatela
authors.forename: Piran R
authors.initials: PR
authors.lastname: Kidambi
authors.forename: Jack A
authors.initials: JA
authors.lastname: Alexander-Webber
authors.forename: Christ
authors.initials: C
authors.lastname: Weijtens
authors.forename: Philipp
authors.initials: P
authors.lastname: Braeuninger-Weimer
authors.forename: Adrianus I
authors.initials: AI
authors.lastname: Aria
authors.forename: Malik M
authors.initials: MM
authors.lastname: Qasim
authors.forename: Timothy D
authors.initials: TD
authors.lastname: Wilkinson
authors.forename: John
authors.initials: J
authors.lastname: Robertson
authors.forename: Stephan
authors.initials: S
authors.lastname: Hofmann
authors.forename: Jens
authors.initials: J
authors.lastname: Meyer