Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 73: Organic Electronics and Photovoltaics II

CPP 73.4: Talk

Wednesday, March 18, 2020, 17:15–17:30, ZEU 260

Triplet Exciton Losses in Polymer:Non Fullerene Acceptor Blends — •Stefanie Dietz, Hannah Lindl, Jannis Klotz, Maria Kotova, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg

Organic bulk heterojunction solar cells utilizing non fullerene acceptors (NFA) received a lot of attention in the past few years as their power conversion efficiency exceeds 16%. This is achieved by a closer matching of donor and acceptor energy levels, but has unfortunately led to a new loss pathway via the now energetically lower lying triplet exciton. We build high performance bulk heterojunction solar cells using the polymer PM6 (a fluorine substituted PBDB-T, PBDB-T-2F) and the NFA Y6 (a fluorine-substituted BTP, BTP-4F). To probe potential losses due to triplet formation we use inherently spin-sensitive methods based on electrical and photoluminescence detected magnetic resonance (EDMR, PLDMR). By comparing pristine materials, blends and ultimately solar cells under realistic operating conditions conclusions can be drawn about potential radiative and non-radiative losses and the involvement of triplet excited states in these organic solar cells.