Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends
The efficiency of organic solar cells with donor polymers and non-fullerene acceptors depends on a complex morphology. Similar chemical and electronic structures impede generating in-depth insights in morphological details. We visualise molecular arrangements and the nanomorphology in PBDB-T:ITIC bl...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 February 2020
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| In: |
Energy & environmental science
Year: 2020, Jahrgang: 13, Heft: 4, Pages: 1259-1268 |
| ISSN: | 1754-5706 |
| DOI: | 10.1039/c9ee03535d |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/c9ee03535d
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| Verfasserangaben: | Wolfgang Köntges, Pavlo Perkhun, Jochen Kammerer, Riva Alkarsifi, Uli Würfel, Olivier Margeat, Christine Videlot-Ackermann, Jean-Jacques Simon, Rasmus R. Schröder, Jörg Ackermann and Martin Pfannmöller |
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| 520 | |a The efficiency of organic solar cells with donor polymers and non-fullerene acceptors depends on a complex morphology. Similar chemical and electronic structures impede generating in-depth insights in morphological details. We visualise molecular arrangements and the nanomorphology in PBDB-T:ITIC blends by correlating transmission electron micrographs and material distribution maps. Material phases are identified by machine learning on hyperspectral data from electron spectroscopic imaging. We observe a specific polymorph of ITIC after thermal annealing. During annealing, enhanced by the presence of additives, PBDB-T acts as nucleation site for ITIC due to strong pi-pi-interactions of the electron withdrawing groups of both molecules. This leads to efficient charge transport paths in ITIC phases with direct pi-pi-contact to PBDB-T at the interface. We conclude that pi-pi-stacking between donor and acceptor molecules facilitates charge carrier generation within mixed interface regions. | ||
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