NDLI: Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymers

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Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymers

Content Provider	Semantic Scholar
Author	Chang, Jui-Fen Clark, Jenny Bryson Zhao, Ni Sirringhaus, Henning Breiby, Dag W. Andreasen, Jens Wenzel Nielsen, Martin Meedom Giles, Mark P. Heeney, Martin McCulloch, Iain
Copyright Year	2006
Abstract	Interchain interactions have a profound effect on the optical as well as charge transport properties of conjugated polymer thin films. In contrast to oligomeric model systems in solution-deposited polymer thin films the study of such effects is complicated by the complex microstructure. We present here a detailed study of interchain interaction effects on both charged polarons as well as neutral excitons in highly crystalline, high-mobility poly-3-hexylthiophene (P3HT) as a function of molecular weight. We find experimental evidence for reduced exciton bandwidth and increased polaron delocalization with increasing conjugation length and crystalline quality. From comparative studies of field-effect transistor characteristics, film morphology, and optical properties our study provides a microscopic understanding of the factors which limit the charge transport in P3HT to field-effect mobilities around $0.1\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}∕\mathrm{V}\phantom{\rule{0.2em}{0ex}}\mathrm{s}$, and which will need to be addressed to improve mobility further.
Starting Page	115318
Ending Page	115318
Page Count	1
File Format	PDF HTM / HTML
DOI	10.1103/PhysRevB.74.115318
Volume Number	74
Alternate Webpage(s)	http://bib-pubdb1.desy.de/record/79245/files/fulltext.pdf
Alternate Webpage(s)	https://doi.org/10.1103/PhysRevB.74.115318
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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