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

Title data

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. (2017) .
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.24562

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Abstract in another language

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 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: 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
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 > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Jan 2018 07:47
Last Modified: 11 Jan 2018 07:47
URI: https://eref.uni-bayreuth.de/id/eprint/41641