掺杂剂
材料科学
兴奋剂
热电效应
离域电子
硼烷
共轭体系
聚合物
热电材料
化学工程
纳米技术
光电子学
有机化学
复合材料
化学
催化作用
热导率
物理
工程类
热力学
作者
Jimin Kim,Duckhyun Ju,Seung Hyun Kim,Kilwon Cho
标识
DOI:10.1002/adfm.202309156
摘要
Abstract Molecular doping of conjugated polymers (CPs) is critical to improve their electrical properties in organic thermoelectric materials, which are promising candidates for low‐temperature energy harvesting and self‐powered sensors. Because excessive dopants are used in the doping process, securing highly crystalline CPs by suppressing dopant‐induced disorder is crucial. Recently, tris(pentafluorophenyl)borane (BCF) has attracted interest as a strong Brønsted acid dopant that enables efficient integer charge transfer by forming a complex with water. However, the crystalline ordering of BCF‐doped CPs has not been properly controlled; the resultant thermoelectric performance is therefore still lower than other p‐doped CPs prepared by conventional redox doping. Here, an efficient doping strategy is proposed with BCF to attain highly doped CPs with dramatically suppressed structural and energetic disorder. In a non‐polar aliphatic solvent, hexane, BCF can effectively diffuse into poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐ b ]thiophene] (PBTTT) via sequential doping, leading to remarkable electrical conductivity and power factor of 230 S cm −1 and 140 µW m −1 K −2 , respectively. In addition, sequentially doped films exhibit highly delocalized transport characteristics owing to the low degree of charge carrier localization within their high solid‐state ordering. The results provide an approach for disorder‐tolerant doping strategies with a systematic investigation of structure–property relationships in highly doped CPs.
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