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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.44: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Investigating Triplet Exciton Losses in PBDB-T:ITIC Bulk Heterojunction Solar Cells — •Johannes Junker1, Maria Kotova1, Alberto Privitera2, Andreas Sperlich1, and Vladimir Dyakonov11Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Department of Physics, Oxford University, Oxford, United Kingdom

Organic bulk heterojunction solar cells based on small molecule non-fullerene acceptors (NFA) received a lot of attention in the past few years as their power conversion efficiency rapidly exceeded the 13% mark. So far, little is known about the photophysics of Polymer:NFA blends. By using spin-sensitive techniques, i.e. photoluminescence and electrically detected magnetic resonance (PLDMR, EDMR), we investigated triplet exciton generation in films of neat Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b’]dithiophene))-alt-(5,5-(1’,3’-di-2-thienyl-5’,7’-bis(2-ethylhexyl)benzo[1’,2’-c:4’,5’-c’]dithiophene-4,8-dione)] (PBDB-T), 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno[1,2-b:5,6-b’]dithiophene (ITIC), their blends and solar cells. In all films we found triplet excitons and CT states at low temperatures. However, in devices operated at ambient conditions, the triplets disappear. We discuss these results in a picture of strongly suppressed triplet exciton generation compared to fullerene-based solar cells.

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