Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends

Abstract: 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 p–p-interactions of the electron withdrawing groups of both molecules. This leads to efficient charge transport paths in ITIC phases with direct p–p-contact to PBDB-T at the interface. We conclude that p–p-stacking between
donor and acceptor molecules facilitates charge carrier generation within mixed interface regions

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: Energy & environmental science. - 13, 4 (2020) , 1259-1268, ISSN: 1754-5706

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2020
• Creator: Köntges, Wolfgang ; Perkhun, Pavlo ; Kammerer, Jochen ; Alkarsifi, Riva ; Würfel, Uli ; Margeat, Olivier ; Videlot-Ackermann, Christine ; Simon, Jean-Jacques ; Schröder, Rasmus R. ; Ackermann, Jörg ; Pfannmöller, Martin

Further information

• DOI: 10.1039/c9ee03535d
• URN: urn:nbn:de:bsz:25-freidok-1676588
• Rights: Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:23 AM CEST