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SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Organic Electronics and Photovoltaics III (joint session CPP/HL)

HL 39.2: Talk

Thursday, March 30, 2023, 09:45–10:00, GÖR 226

A thorough analysis of conformational locking and related electrical properties in fluorinated thieno-quinoxalines — •Md Moidul Islam1,2, Arthur Markus Anton1,2,5, Shahidul Alam6, Rico Meitzner1,2, Christos L. Chochos3,4, Ulrich S. Schubert1,2, and Harald Hoppe1,21Laboratory of Organic and Macromolecular Chemistry (IOMC),Friedrich Schiller University Jena, Jena, Germany — 2Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Jena, Germany — 3Institute of Chemical Biology, National Hellenic Research Foundation, Athens 11635, Greece — 4Advent Technologies SA, Patra, Greece — 5Peter Debye Institute for Soft Matter Physics, Universität Leipzig, Leipzig, Germany — 6King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), Kingdom of Saudi Arabia

Thieno-quinoxaline derivatives with low band gaps are promising donor materials for organic solar cells. Therefore, investigations have been conducted on thieno-quinoxaline polymers with systematically varied fluorination sites. Cyclic voltammetry revealed that fluorination lowers both the HOMO as well as LUMO energy levels, whereas the size of photochromic units is affected through the particular kind of fluorination demonstrated by UV-Vis absorption spectra. Furthermore, excitation-emission mapping exposed excitation-independent and excitation-selective PL pathways.

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