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    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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    3.542Mb
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    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2021-12-06
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    Type
    Article
    Authors
    Xiao, Mingfei
    Sadhanala, Aditya
    Abdi-Jalebi, Mojtaba
    Thomas, Tudor H.
    Ren, Xinglong
    Zhang, Tao
    Chen, Hu cc
    Carey, Remington L.
    Wang, Qijing
    Senanayak, Satyaprasad P.
    Jellett, Cameron
    Onwubiko, Ada
    Moser, Maximilian
    Liao, Hailiang
    Yue, Wan
    McCulloch, Iain cc
    Nikolka, Mark
    Sirringhaus, Henning cc
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Chemical Science Program
    Embargo End Date
    2021-12-06
    Submitted Date
    202-08-28
    Permanent link to this record
    http://hdl.handle.net/10754/666270
    
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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 (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.202007359
    Sponsors
    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
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.202007359
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1002/adfm.202007359
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.202007359
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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