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Role of Torsional Flexibility in the Film Formation Process in Two π-Conjugated Model Oligomers

Title data

Wedler, Stefan ; Zhou, Cheng ; Bazan, Guillermo C. ; Panzer, Fabian ; Köhler, Anna:
Role of Torsional Flexibility in the Film Formation Process in Two π-Conjugated Model Oligomers.
In: The Journal of Physical Chemistry Letters. Vol. 11 (2020) . - pp. 9379-9386.
ISSN 1948-7185
DOI: https://doi.org/10.1021/acs.jpclett.0c02778

Abstract in another language

The performance of solution-processed organic semiconductor devices is heavily influenced by the morphology of the active layer. Film formation is a complex process, with the final morphology being the result of the interplay between processing parameters and molecular properties, which is only poorly understood. Here, we investigate the influence of molecular stiffness by using two model oligomers, TT and CT, which differ only in the rotational flexibility of their central building block. We monitor absorption and emission simultaneously in situ during spin coating. We find that film formation takes place in four similar stages for both compounds. However, the time scales are remarkably different during the third stage, where electronically interacting aggregates are created. While this process is fast for the stiff CT, it takes minutes for the flexible TT. By comparing with previously determined aggregation properties in solution, we conclude that even though aggregate formation concurs with a planarization process, a certain amount of backbone flexibility is beneficial for establishing ordered structures during film formation. Here, the elongated time window in the case of the flexible compound can further allow for better processing control.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 27 Oct 2020 13:04
Last Modified: 27 Oct 2020 13:04
URI: https://eref.uni-bayreuth.de/id/eprint/58744