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    XIE Ziyi, SHAN Tong, WEI Qingyun, ZHONG Hongliang. Photoelectric Properties of Polythiophene Modified by Post-Polymerization Strategy[J]. Journal of Functional Polymers, 2021, 34(5): 425-433. doi: 10.14133/j.cnki.1008-9357.20210430001
    Citation: XIE Ziyi, SHAN Tong, WEI Qingyun, ZHONG Hongliang. Photoelectric Properties of Polythiophene Modified by Post-Polymerization Strategy[J]. Journal of Functional Polymers, 2021, 34(5): 425-433. doi: 10.14133/j.cnki.1008-9357.20210430001

    Photoelectric Properties of Polythiophene Modified by Post-Polymerization Strategy

    • To optimize the structure and energy levels of polythiophene, a new type polymer namely of PtTSBO with thioalkyl side chains is successfully synthesized by Kumada catalyst transfer polycondensation (KCTP) with the monomer containing four thiophene units and thioalkyl sidechains, which broadens the scope of KTCP application. A post-polymerization strategy is also developed to functionally modify the side chains of PtTSBO. Polymers PtTSOBO and PtTSOOBO are prepared by controlling the amount of 3-chloroperbenzoic acid (m-CPBA) and the reaction temperature so that the sulfide in the side chains of PtTSBO can be efficiently and selectively oxidized to sulfoxide and sulfone. The chemical structure, light absorption and electrical properties are characterized by 1H-NMR, elemental analysis (EA), UV-Vis absorption spectroscopy and cyclic voltammetry (CV), and corresponding photovoltaic devices. After the post-polymerization modification, the HOMO energy levels of PtTSOBO and PtTSOOBO are significantly lower than that of PtTSBO, thus increasing the open-circuit voltage (Voc) of the corresponding photovoltaic devices. However, by introducing sulfoxide or sulfone groups, the planarity of the backbone in polythiophene is reduced, which is not conducive to their solid-state aggregation, consequently deteriorating the overall performance of photovoltaic devices fabricated. The photovoltaic devices based on PtTSOBO and PtTSOOBO need to be further studied and optimized, such as meticulous selection of acceptor materials with more suitable energy levels and miscibility. Meanwhile, the downshift energy levels of PtTSOBO and PtTSOOBO suggest they might be available for the application as electron-acceptor. This post-polymerization method paves a new way for modifying polythiophenes and promoting the low-cost production of functionalized polythiophenes.
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