Linking Glass-Transition Behavior to Photophysical and Charge Transport Properties of High-Mobility Conjugated Polymers
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Linking glass-transition behaviour to photophysical and charge transport properties of high-mobility conjugated polymers .pdf
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2021-12-06
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ArticleAuthors
Xiao, MingfeiSadhanala, Aditya
Abdi-Jalebi, Mojtaba
Thomas, Tudor H.
Ren, Xinglong
Zhang, Tao
Chen, Hu

Carey, Remington L.
Wang, Qijing
Senanayak, Satyaprasad P.
Jellett, Cameron
Onwubiko, Ada
Moser, Maximilian
Liao, Hailiang
Yue, Wan
McCulloch, Iain

Nikolka, Mark
Sirringhaus, Henning

KAUST Department
KAUST Solar Center (KSC)Physical Science and Engineering (PSE) Division
Chemical Science Program
Embargo End Date
2021-12-06Submitted Date
202-08-28Permanent link to this record
http://hdl.handle.net/10754/666270
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The measurement of the mechanical properties of conjugated polymers can reveal highly relevant information linking optoelectronic properties to underlying microstructures and the knowledge of the glass transition temperature (Tg) is paramount for informing the choice of processing conditions and for interpreting the thermal stability of devices. In this work, we use dynamical mechanical analysis to determine the Tg of a range of state-of-the-art conjugated polymers with different degrees of crystallinity that are widely studied for applications in organic field-effect transistors. We compare our measured values for Tg to the theoretical value predicted by a recent work based on the concept of effective mobility ζ. The comparison shows that for conjugated polymers with a modest length of the monomer units, the Tg values agree well with theoretically predictions. However, for the near-amorphous, indacenodithiophene–benzothiadiazole family of polymers with more extended backbone units, values for Tg appear to be significantly higher, predicted by theory. However, values for Tg are correlated with the sub-bandgap optical absorption suggesting the possible role of the interchain short contacts within materials’ amorphous domains.Citation
Xiao, M., Sadhanala, A., Abdi-Jalebi, M., Thomas, T. H., Ren, X., Zhang, T., … Sirringhaus, H. (2020). Linking Glass-Transition Behavior to Photophysical and Charge Transport Properties of High-Mobility Conjugated Polymers. Advanced Functional Materials, 2007359. doi:10.1002/adfm.202007359Sponsors
The authors gratefully acknowledge financial support by the Engineering and Physical Sciences Research Council (EPSRC) through a program grant (EP/M005143/1) and by the European Research Council (ERC) through a Synergy grant (SC2 610115).Publisher
WileyJournal
Advanced Functional MaterialsAdditional Links
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202007359ae974a485f413a2113503eed53cd6c53
10.1002/adfm.202007359