title: Charge Transport by Superexchange in Molecular Host-Guest Systems.
abstract: Charge transport in disordered organic semiconductors is generally described as a result of incoherent hopping between localized states. In this work, we focus on multicomponent emissive host-guest layers as used in organic light-emitting diodes (OLEDs), and show using multiscale ab initio based modeling that charge transport can be significantly enhanced by the coherent process of molecular superexchange. Superexchange increases the rate of emitter-to-emitter hopping, in particular if the emitter molecules act as relatively deep trap states, and allows for percolation path formation in charge transport at low guest concentrations.
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Hermann von Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Franz
authors.initials: F
authors.lastname: Symalla
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Hermann von Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Pascal
authors.initials: P
authors.lastname: Friederich
authors.affiliation: Department of Applied Physics and Institute for Complex Molecular systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: Andrea
authors.initials: A
authors.lastname: Massé
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Hermann von Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Velimir
authors.initials: V
authors.lastname: Meded
authors.affiliation: Department of Applied Physics and Institute for Complex Molecular systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: Reinder
authors.initials: R
authors.lastname: Coehoorn
authors.affiliation: Department of Applied Physics and Institute for Complex Molecular systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: Peter
authors.initials: P
authors.lastname: Bobbert
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Hermann von Helmholtz-Platz 1,76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wenzel