title: Weak charge transfer between an acceptor molecule and metal surfaces enabling organic/metal energy level tuning.
abstract: Evidence for charge transfer (CT) between the electron acceptor molecule octafluoroanthraquinone (FAQ) and the metal surfaces Ag(111) and polycrystalline Au is provided by ultraviolet photoelectron spectroscopy. The energy level alignment of subsequently deposited sexithienyl (6T) on FAQ-precovered metal substrates was investigated. Due to the metal work function change induced by the FAQ-metal CT, the hole injection barrier of 6T on FAQ-precovered metals could be reduced by up to 0.60 eV compared to that of 6T on pristine metal surfaces.
authors.affiliation: Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Duhm
authors.forename: Hendrik
authors.initials: H
authors.lastname: Glowatzki
authors.forename: Valentin
authors.initials: V
authors.lastname: Cimpeanu
authors.forename: Jürgen
authors.initials: J
authors.lastname: Klankermayer
authors.forename: Jürgen P
authors.initials: JP
authors.lastname: Rabe
authors.forename: Robert L
authors.initials: RL
authors.lastname: Johnson
authors.forename: Norbert
authors.initials: N
authors.lastname: Koch