title: On the efficiency of charge transfer state splitting in polymer:fullerene solar cells.
abstract: The field dependence and yield of free charge carrier generation in polymer:fullerene blends with varying energetic offsets is not affected when the excitation energy is varied from above band-gap to direct CT state excitation. Instead, the ability of the CT state to split is dictated by the energetic offset between the relaxed CT state and the charge separated (CS) state.
authors.affiliation: Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
authors.forename: Steve
authors.initials: S
authors.lastname: Albrecht
authors.forename: Koen
authors.initials: K
authors.lastname: Vandewal
authors.forename: John R
authors.initials: JR
authors.lastname: Tumbleston
authors.forename: Florian S U
authors.initials: FS
authors.lastname: Fischer
authors.forename: Jessica D
authors.initials: JD
authors.lastname: Douglas
authors.forename: Jean M J
authors.initials: JM
authors.lastname: Fréchet
authors.forename: Sabine
authors.initials: S
authors.lastname: Ludwigs
authors.forename: Harald
authors.initials: H
authors.lastname: Ade
authors.forename: Alberto
authors.initials: A
authors.lastname: Salleo
authors.forename: Dieter
authors.initials: D
authors.lastname: Neher
keywords: charge generation; charge transfer states; driving force; excess energy; geminate recombination; morphology; organic solar cells; spectroelectrochemistry