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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.39: Poster
Wednesday, April 3, 2019, 11:00–13:00, Poster B1
Molecular orientation of diketopyrrolopyrrole (DPP)-based donor-acceptor copolymers in thin films — Andreas Früh1, •Sven Bölke1, Florian Trilling2, Ullrich Scherf2, Thomas Chassé1, and Heiko Peisert1 — 1Institute of Physical and Theoretical Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany — 2Makromolekulare Chemie und Institut für Polymertechnologie, Bergische Universität Wuppertal, Gaussstrasse 20, 42119 Wuppertal, Germany
Novel low band gap (LBG) polymers are interesting materials for organic-based devices because of their high absorption in the solar spectrum and favourable electronic properties. For applications, the self-organization in thin films is an important issue in which the chemical structure determines largely the arrangement of the polymer chains.
Promising materials in this context are diketopyrrolopyrrole(DPP)-based donor-acceptor copolymers, where the DPP unit is inscribed into a double-stranded ladder framework leading to partially ladderized step-ladder polymers with high charge transfer mobilities, attributed to the highly aggregated, π-stacked conformation of DPP.
In the present study, we use polarization dependent IR spectroscopy in transmission to investigate the preferred orientation of DPP-based donor-acceptor copolymers in about 300 nm thin films. Analyzing vibrations with differently oriented transition dipole moments, we discuss the preferred molecular orientation of the polymers in context with the chemical structure. Transition dipole moments were calculated using DFT.