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HL: Fachverband Halbleiterphysik

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

HL 39.2: Vortrag

Donnerstag, 30. März 2023, 09:45–10:00, GÖR 226

A thorough analysis of conformational locking and related electrical properties in fluorinated thieno-quinoxalines — •Md Moidul Islam^1,2, Arthur Markus Anton^1,2,5, Shahidul Alam⁶, Rico Meitzner^1,2, Christos L. Chochos^3,4, Ulrich S. Schubert^1,2, and Harald Hoppe^1,2 — ¹Laboratory 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.