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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.38: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

Effect of thiophene- and benzothiadazole-based non-fullerene acceptors in organic solar cells — •Jannis Klotz, Hannah Lindl, Stefanie Dietz, Maria Kotova, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg

Organic bulk heterojunction solar cells based on small molecule non-fullerene acceptors (NFA) received a lot of attention in the past few years due to a rapid increase in the device efficiencies up to 16%. This breakthrough, being highly promising, was mostly driven by empirical material engineering rather than by device-physics design. In this work we compare the already well established thiophene-based acceptor molecule ITIC and a novel benzothiadiazole-based acceptor molecule Y6. We studied optical and electrical properties of pure materials and blends as well as working devices. The acceptor ITIC was combined with the donor polymer PBDB-T and Y6 with a fluorinated version of PBDB-T: PM6. The redshifted and increased absorption of the PM6:Y6 blend in comparison to PBDB-T: ITIC lead to substantially increased short circuit currents and thus to higher device efficiencies. Nevertheless, fluorinated materials have shown to have limited solubility and faster device degradation. We investigated device preparation and degradation of both to evaluate their prospects for organic solar cells.