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Controlling aggregate formation in conjugated polymers by spin-coating below the critical temperature of the disorder-order transition

Titelangaben

Reichenberger, Markus ; Kroh, Daniel ; Matrone, Giovanni M. M. ; Schötz, Konstantin ; Pröller, Stephan ; Filonik, Oliver ; Thordardottir, Margret E. ; Herzig, Eva M. ; Bässler, Heinz ; Stingelin, Natalie ; Köhler, Anna:
Controlling aggregate formation in conjugated polymers by spin-coating below the critical temperature of the disorder-order transition.
In: Journal of Polymer Science Part B: Polymer Physics. Bd. 56 (2018) Heft 6 . - S. 532-542.
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.24562

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Abstract

Aggregates – that is short-ranged ordered moieties in the solid-state of π-conjugated polymers – play an important role in the photophysics and performance of various optoelectronic devices. We have previously shown that many polymers change from a disordered to a more ordered conformation when cooling a solution below a characteristic critical temperature urn:x-wiley:08876266:media:polb24562:polb24562-math-0001. Using in situ time-resolved absorption spectroscopy on the prototypical semiconducting polymers P3HT, PFO, PCPDTBT, and PCE11 (PffBT4T-2OD), we show that spin-coating at a temperature below urn:x-wiley:08876266:media:polb24562:polb24562-math-0002 can enhance the formation of aggregates with strong intra-chain coupling. An analysis of their time-resolved spectra indicates that the formation of nuclei in the initial stages of film formation for substrates held below urn:x-wiley:08876266:media:polb24562:polb24562-math-0003 seems responsible for this. We observe that the growth rate of the aggregates is thermally activated with an energy of 310 meV, which is much more than that of the solvent viscosity (100 meV). From this we conclude that the rate controlling step is the planarization of a chain that is associated with its attachment to a nucleation center. The success of our approach for the rather dynamic deposition method of spin-coating holds promise for other solution-based deposition methods.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: dimer; excimer; excitonic coupling; film formation; low-bandgap polymers; phase transition; self-assembly; solar cells; thin films
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung - Juniorprof. Dr. Eva M. Herzig
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 12 Jan 2018 09:53
Letzte Änderung: 11 Feb 2022 10:23
URI: https://eref.uni-bayreuth.de/id/eprint/41669