Synthesis and Characterization of Random Copolymers with Thermoelectric Properties
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초록
내용
Various donor–acceptor (D–A) conjugated polymers (CPs) have been studied as thermoelectric (TE) materials due to their excellent charge-carrier mobilities and Seebeck coefficient values. However, the complex structure–property relationships of doped D–A CPs hinder the understanding of how the electronic structure influences charge transport, as D–A CPs modify their molecular packing structures through both the doping process and different donor and acceptor moiety chemical structures. In this study, five random copolymers were synthesized by varying the feed ratio of two oligomeric building blocks, which differ only in the introduction of a strong electron-withdrawing cyano group into the vinylene bond located between the two thiophene rings. The charge-carrier mobility of the doped CPs increased with delocalization of the polarons with an increasing DPP-TVT composition, resulting in a superior TE performance.