Regensburg 2025 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 29: Organic Electronics and Photovoltaics III
CPP 29.2: Talk
Wednesday, March 19, 2025, 15:15–15:30, H38
Fluorination of Thieno-quinoxalines enables tunable excitonic and electronic bandgaps — •Md Moidul Islam1,2, Arthur Markus Anton3, Shahidul Alam4, Patrick Irmisch3, Alexander J. Much7, Ulrich S. Schubert1,2, Christos Chochos5,6, and Harald Hoppe1,2 — 1IOMC, FSU Jena, Humboldtstrasse 10, 07743 Jena, Germany — 2CEEC Jena, Philosophenweg 7a, 07743 Jena, Germany — 3Peter Debye Institute for Soft Matter Physics, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig — 4KAUST Solar Center, PSE, MSE, Thuwal 23955-6900, Kingdom of Saudi Arabia — 5Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece — 6Advent Technologies SA, Patras Science Park, Stadiou Street, Platani-Rio, 26504, Patra, Greece — 7Experimental Polymer Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany
Thieno-quinoxaline conjugated polymers are an interesting class of organic semiconductors. While it is known that fluorination causes shifts in the molecular energy levels to deeper binding energies, the mechanisms behind are, so far, not well characterized. In this study, six thieno-quinoxaline polymers with a systematically increased number of fluorinated sites were investigated in solutions and films. Our results indicate a strong correlation between the extend of fluorination, the molecular planarity, and its ability to form aggregates. We also demonstrate, in unprecedented detail, how these structural properties influence various behaviors related to optical and electronic properties.
Keywords: Thieno-quinoxaline; conjugated polymers; fluorination; molecular energy