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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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Main Authors: Köntges, Wolfgang (Author) , Perkhun, Pavlo (Author) , Kammerer, Jochen (Author) , Alkarsifi, Riva (Author) , Würfel, Uli (Author) , Margeat, Olivier (Author) , Videlot-Ackermann, Christine (Author) , Simon, Jean-Jacques (Author) , Schröder, Rasmus R. (Author) , Ackermann, Jörg (Author) , Pfannmöller, Martin (Author)
Format: Article (Journal)
Language:English
Published: 21 February 2020
In: Energy & environmental science
Year: 2020, Volume: 13, Issue: 4, Pages: 1259-1268
ISSN:1754-5706
DOI:10.1039/c9ee03535d
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/c9ee03535d
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Author Notes: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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Summary: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.
Item Description:Gesehen am 18.06.2020
Physical Description:Online Resource
ISSN:1754-5706
DOI:10.1039/c9ee03535d

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