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Regioregularity and intrachain ordering: Impact on the nanostructure and charge transport in two-dimensional assemblies of poly(3-hexylthiophene)

Title
Regioregularity and intrachain ordering: Impact on the nanostructure and charge transport in two-dimensional assemblies of poly(3-hexylthiophene)
Authors
Aiyar, A.R.[Aiyar, Avishek R.]Hong, J.-I.[Hong, Jung Il]Reichmanis, E.[Reichmanis, Elsa]
DGIST Authors
Hong, J.-I.[Hong, Jung Il]
Issue Date
2012
Citation
Chemistry of Materials, 24(15), 2845-2853
Type
Article
Article Type
Article
Keywords
Carrier MobilityConjugagtionConjugation LengthCrystallinitiesElectronic Absorption SpectraExciton BandwidthField-Effect MobilitiesFree ExcitonsGrain BoundariesMacromolecular SystemsMain ChainsMobilityMorphological PropertiesNano-FibrilsOFETOrders of MagnitudeOrganic Field-Effect TransistorsPlanarizationPoly(3-Hexylthiophene)Polymer FilmsRegioregularitySide-ChainsSingle ChainsSupramolecular AssembliesTwo-Dimensional Assemblies
ISSN
0897-4756
Abstract
The properties of supramolecular assemblies in conjugated macromolecular systems are strongly dependent on single chain effects. We report that differences in regioregularity (RR) of side chain attachment in poly(3-hexylthiophene) (P3HT) as small as ca. 4% are sufficient to induce dramatic changes in the electronic and morphological properties of the material. Casting the electronic absorption spectra in the framework of Spano's model reveals that the conjugation length is surprisingly sensitive to RR, with differences in free exciton bandwidth between the two P3HT samples approaching 73 meV. The enhanced main chain planarization motivates a concomitant increase in nanofibril width as well as crystallinity observed in thin films of the higher RR variant. This observation correlates well with the field effect mobilities that are attenuated by 1 to 2 orders of magnitude in the lower RR polymer film. We suggest that the increased intrachain order coupled with a reduced fraction of grain boundaries in the higher RR film is responsible for the reported differences. © 2012 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3405
DOI
10.1021/cm202700k
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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