Siloxane side engineered conjugated polymers exhibit good film forming capabilities and have been reported for a variety of advanced energy applications. However, their potential for regulating polymer crystallinity to achieve high thermoelectric (TE) properties remains unexplored. In this study, siloxane side-chained diketopyrrolopyrrole polymers (PDPPSi_x, where x is the molar ratio of the siloxane side chain) and their corresponding FeCl₃-doped films were designed and synthesized by the solution-processed drop-casting method to improve the thermoelectric properties. The results show that the addition of siloxane side chains enhances the crystallinity and doping efficiency of the DPPSi_x polymers and thus improves the conductivity and TE performance. It is worth noting that the 5-min FeCl₃-doped PDPPSi₅₀ film exhibits excellent thermoelectric properties, with an electronic conductivity of 66.29 S cm⁻¹ and a maximum power factor (PF) of 38.6 μW m⁻¹ K⁻², which are about 7-fold and 3-fold higher than those of polymer films without siloxane side chains, respectively. The synergistic effect between siloxane side chains and FeCl₃ doping significantly increases the charge carrier concentration and mobility and enhances the conductivity and thermoelectric efficiency of DPP-based TE polymers. This study highlights the potential of solution-processed, inorganic-doped, and side chain engineered conjugated polymer films for enhancing thermoelectric power generation.

中文翻译：

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硅氧烷工程聚二酮吡咯衍生物，具有更高的结晶度和掺杂效率，用于热电发电


硅氧烷侧工程共轭聚合物具有良好的成膜能力，并已被报道用于各种高级能源应用。然而，它们调节聚合物结晶度以实现高热电 （TE） 性能的潜力仍未得到探索。在本研究中，通过固溶处理滴铸法设计合成了硅氧烷侧链二酮吡咯聚合物（PDPPSi_x，其中 x 是硅氧烷侧链的摩尔比）及其相应的 FeCl₃ 掺杂薄膜，以改善热电性能。结果表明，硅氧烷侧链的添加提高了 DPPSi_x 聚合物的结晶度和掺杂效率，从而提高了导电性和 TE 性能。值得注意的是，5 min FeCl₃ 掺杂 PDPPSi₅₀ 薄膜表现出优异的热电性能，电子电导率为 66.29 S ^cm-1，最大功率因数 （PF） 为 38.6 μW ^{m-1 K-2}，比没有硅氧烷侧链的聚合物薄膜高约 7 倍和 3 倍， 分别。硅氧烷侧链和 FeCl₃ 掺杂之间的协同作用显著提高了电荷载流子浓度和迁移率，并提高了基于 DPP 的 TE 聚合物的导电性和热电效率。这项研究强调了溶液处理、无机掺杂和侧链工程共轭聚合物薄膜在增强热发电方面的潜力。