Influence of Side-alkyl Chain in the Electrical Conductivity and Structural Characteristics of AuCl<sub>3</sub>-Doped Diketopyrrolopyrrole Polymers.
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Recently, there has been growing interest in organic thermoelectric (OTE) materials, leading to a significant emphasis on advancing conjugated polymers (CPs). However, despite notable progress in molecular design for high-performance OTE materials, the electrical conductivities and power factor of CPs still require significant enhancement for the practical application of organic thermoelectric generators. In this study, we employed a side-alkyl engineering strategy on a series of DPP-based polymers to systematically investigate the effects of side-alkyl chain lengths on the doping process. Our results indicate that the polymer with the shortest side chain exhibited the optimum electrical conductivity of 58 S cm-1 and power factors of 70 µW m-1K-2 as a high crystallinity and an ordered structure. This study indicates that fine-tuning the length of the side-alkyl chain of CPs can be an effective strategy to enhance the OTE properties of CPs.