title: Effect of the fibrillar microstructure on the efficiency of high molecular weight diketopyrrolopyrrole-based polymer solar cells.
abstract: The nature of the solubilizing alkyl side chains has a strong effect on the performance of semiconducting diketopyrrolopyrrole polymers in organic solar cells with fullerene acceptors. The effect relates to the width of semicrystalline polymer fibrils that form in these blends. If the width of the fibril is wider than the exciton diffusion length, fewer charges form and the efficiency drops.
authors.affiliation: Molecular Materials and Nanosystems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Li
authors.forename: Koen H
authors.initials: KH
authors.lastname: Hendriks
authors.forename: Alice
authors.initials: A
authors.lastname: Furlan
authors.forename: W S C
authors.initials: WS
authors.lastname: Roelofs
authors.forename: Stefan C J
authors.initials: SC
authors.lastname: Meskers
authors.forename: Martijn M
authors.initials: MM
authors.lastname: Wienk
authors.forename: René A J
authors.initials: RA
authors.lastname: Janssen
keywords: conjugated polymers; exciton diffusion; microstructure; organic electronics; organic solar cells