Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.39: Poster

Mittwoch, 3. April 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.