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    A comparative study on the thermal- and microwave-assisted Stille coupling polymerization of a benzodithiophene-based donor–acceptor polymer (PTB7)

    Title of paper
    A comparative study on the thermal- and microwave-assisted Stille coupling polymerization of a benzodithiophene-based donor–acceptor polymer (PTB7)
    Author
    [박태호교수 연구실]
    Publication in journal
    Journal of Materials Chemistry A, 5, p3330-3335 (January 2017)
    Publication date
    20170111
    [Abstract]
    We report a comparative study on the thermal- and microwave-assisted Stille-coupling polymerization of a benzodithiophene-based donor–acceptor polymer (PTB7). For this study, we synthesized PTB7 polymers through Stille-coupling polymerization under microwave conditions (M-PTB7, Mn = 75 kg/mol, and D = 2.2) as well as thermal conditions (T-PTB7, Mn = 31 kg/mol, D = 2.1). Although the microwave-assisted method increases the molecular weight of PTB7 in a short time, the power conversion efficiency of MPTB7 (2.8%) is lower than that of T-PTB7 (7.8%). The microwave-assisted method was found to generate more structural defects from homo-coupling side reactions, resulting in a decrease in JSC and FF values for M-PTB7. Our findings highlight the importance of controlling the generation of homocoupled units during the synthesis of PTB7 polymers for high-performance PSCs.
     
     
    DOI: 10.1039/C6TA09212H
    LINK: http://pubs.rsc.org/en/content/articlepdf/2017/ta/c6ta09212h