Identifying the Signatures of Intermolecular Interactions in Blends of PM6 with Y6 and N4 Using Absorption Spectroscopy

Daniel Kroh; Fabian Eller; Konstantin SchoetzStefan WedlerLorena Perdigon-ToroGuillaume FreychetQingya WeiMaximilian DoerrDavid JonesYingping ZouEva M. HerzigDieter NeherAnna Koehler

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Identifying the Signatures of Intermolecular Interactions in Blends of PM6 with Y6 and N4 Using Absorption Spectroscopy

机译：Identifying the Signatures of Intermolecular Interactions in Blends of PM6 with Y6 and N4 Using Absorption Spectroscopy

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In organic solar cells, the resulting device efficiency depends strongly on the local morphology and intermolecular interactions of the blend film. Optical spectroscopy was used to identify the spectral signatures of interacting chromophores in blend films of the donor polymer PM6 with two state-of-theart nonfullerene acceptors, Y6 and N4, which differ merely in the branching point of the side chain. From temperature-dependent absorption and luminescence spectroscopy in solution, it is inferred that both acceptor materials form two types of aggregates that differ in their interaction energy. Y6 forms an aggregate with a predominant J-type character in solution, while for N4 molecules the interaction is predominantly in a H-like manner in solution and freshly spin-cast film, yet the molecules reorient with respect to each other with time or thermal annealing to adopt a more J-type interaction. The different aggregation behavior of the acceptor materials is also reflected in the blend films and accounts for the different solar cell efficiencies reported with the two blends.

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《Advanced functional materials》 |2022年第44期|2205711.1-2205711.14|共14页
作者
Daniel Kroh; Fabian Eller; Konstantin SchoetzStefan WedlerLorena Perdigon-ToroGuillaume FreychetQingya WeiMaximilian DoerrDavid JonesYingping ZouEva M. HerzigDieter NeherAnna Koehler;
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Dynamik und Strukturbildung-Herzig Group Physikalisches Institut Universitaet Bayreuth Universitaetsstr. 30, 95447 Bayreuth, Germany;

Soft Matter Physics and Optoelectronics Institute of Physics and Astronomy University of Potsdam Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany;

Soft Matter Optoelectronics Experimentalphysik Ⅱ University of Bayreuth 95440 Bayreuth, Germany,Bayreuth Institute of Macromolecular Research (BIMF) and Bavarian Polymer Institute (BPI) University of Bayreuth 95447 Bayreuth, GermanySoft Matter Optoelectronics Experimentalphysik Ⅱ University of Bayreuth 95440 Bayreuth, GermanyNSLS-Ⅱ Brookhaven National Laboratory Upton, NY 11973, USACollege of Chemistry and Chemical Engineering Central South University Chansha 410083, P. R. ChinaSchool of Chemistry Bio21 Institute The University of Melbourne 30 Flemington Road, Parkville, VIC 3010, Australia;

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charge-transfer states; Frank-Condon analysis; morphology; organic solar cells;

Identifying the Signatures of Intermolecular Interactions in Blends of PM6 with Y6 and N4 Using Absorption Spectroscopy

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