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Linking Glass-Transition Behavior to Photophysical and Charge Transport Properties of High-Mobility Conjugated Polymers

Xiao, M and Sadhanala, A and Abdi-Jalebi, M and Thomas, TH and Ren, X and Zhang, T and Chen, H and Carey, RL and Wang, Q and Senanayak, SP and Jellett, C and Onwubiko, A and Moser, M and Liao, H and Yue, W and McCulloch, I and Nikolka, M and Sirringhaus, H (2021) Linking Glass-Transition Behavior to Photophysical and Charge Transport Properties of High-Mobility Conjugated Polymers. Advanced Functional Materials, 31. ISSN 1616-301X

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Abstract

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 (T ) 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 T 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 T 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 T values agree well with theoretically predictions. However, for the near-amorphous, indacenodithiophene–benzothiadiazole family of polymers with more extended backbone units, values for T appear to be significantly higher, predicted by theory. However, values for T are correlated with the sub-bandgap optical absorption suggesting the possible role of the interchain short contacts within materials’ amorphous domains. g g g g g g

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 11 Nov 2020 21:48
Last Modified: 13 Apr 2021 10:16
DOI: 10.1002/adfm.202007359