title: Morphology, Crystal Structure and Charge Transport in Donor-Acceptor Block Copolymer Thin Films.
abstract: We studied structure and charge transport properties of thin films of donor-acceptor block copolymers, poly(3-hexylthiophene-block-perylene bisimide acrylate), using a combination of X-ray scattering, AFM and vertical charge transport measurements in diode devices. Block copolymer self-assembly and crystallization of the individual components are interrelated and different structural states of the films could be prepared by varying preparation conditions and thermal history. Generally the well-defined microphase structures found previously in bulk could also be prepared in thin films, in addition alignment induced by interfacial interactions was observed. Microphase separated block copolymers sustain ambipolar charge transport, but the exact values of electron and hole mobilities depend strongly on orientation and connectivity of the microdomains as well as the molecular order within the domains.
authors.affiliation: †Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, von-Danckelman Platz 3, 06120 Halle (Saale), Germany.
authors.forename: Gaurav
authors.initials: G
authors.lastname: Gupta
authors.affiliation: ‡Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany.
authors.forename: Chetan R
authors.initials: CR
authors.lastname: Singh
authors.affiliation: §Makromolekulare Chemie I, Universität Bayreuth, 95440 Bayreuth, Germany, and.
authors.forename: Ruth H
authors.initials: RH
authors.lastname: Lohwasser
authors.affiliation: ‡Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany.
authors.forename: Marcel
authors.initials: M
authors.lastname: Himmerlich
authors.affiliation: ‡Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Krischok
authors.affiliation: ⊥Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Müller-Buschbaum
authors.affiliation: §Makromolekulare Chemie I, Universität Bayreuth, 95440 Bayreuth, Germany, and.
authors.forename: Mukundan
authors.initials: M
authors.lastname: Thelakkat
authors.affiliation: ‡Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Hoppe
authors.affiliation: †Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, von-Danckelman Platz 3, 06120 Halle (Saale), Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Thurn-Albrecht
keywords: X-ray scattering; charge carrier mobility; crystal texture; donor−acceptor block copolymers; microphase structure; thin films