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

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Reichenberger, Markus ; Kroh, Daniel ; Matrone, Giovanni M. M. ; Schötz, Konstantin ; Pröller, Stephan ; Filonik, Oliver ; Thordardottir, Margret E. ; Herzig, Eva M. ; Bässler, Heinz ; Stingelin, Natali ; 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) . - 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 \ensuremathπ-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 math formula. 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 math formula 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 math formula 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
Zusätzliche Informationen: Online Version of Record published before inclusion in an issue
Keywords: dimer; excimer; excitonic coupling; film formation; low-bandgap polymers; phase transition; self-assembly; solar cells; thin films
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung - Juniorprof. Dr. Eva Maria Herzig
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 12 Jan 2018 09:53
Letzte Änderung: 05 Apr 2018 08:18
URI: https://eref.uni-bayreuth.de/id/eprint/41669