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Effect of Side Chain Substituent Volume on Thermoelectric Properties of IDT-Based Conjugated Polymers.

De-Xun XieTong-Chao LiuJing XiaoJing-Kun FangCheng-Jun PanGuang Shao
Published in: Molecules (Basel, Switzerland) (2021)
A p-type thermoelectric conjugated polymer based on indacenodithiophene and benzothiadiazole is designed and synthesized by replacing normal aliphatic side chains (P1) with conjugated aromatic benzene substituents (P2). The introduced bulky substituent on P2 is detrimental to form the intensified packing of polymers, therefore, it hinders the efficient transporting of the charge carriers, eventually resulting in a lower conductivity compared to that of the polymers bearing aliphatic side chains (P1). These results reveal that the modification of side chains on conjugated polymers is crucial to rationally designed thermoelectric polymers with high performance.
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