极化子
材料科学
双极化子
导电聚合物
兴奋剂
化学物理
离子键合
电导率
拉曼光谱
电化学
生物电子学
离子电导率
聚合物
聚乙炔
纳米技术
电极
离子
光电子学
物理化学
电解质
有机化学
化学
复合材料
物理
光学
电子
量子力学
生物传感器
作者
Priscila Cavassin,Isabelle Holzer,Δήμητρα Τσόκκου,Olivier Bardagot,Julien Réhault,Natalie Banerji
标识
DOI:10.1002/adma.202300308
摘要
Abstract Conjugated polymers are increasingly used as organic mixed ionic–electronic conductors in electrochemical applications for neuromorphic computing, bioelectronics, and energy harvesting. The design of efficient electrochemical devices relies on large modulations of the polymer conductivity, fast doping/dedoping kinetics, and high ionic uptake. In this work, structure–property relations are established and control of these parameters by the co‐existence of order and disorder in the phase morphology is demonstrated. Using in situ time‐resolved spectroelectrochemistry, resonant Raman, and terahertz (THz) conductivity measurements, the electrochemical doping in the different morphological domains of poly(3‐hexylthiophene) (P3HT) is investigated. The main finding is that bipolarons are found preferentially in disordered polymer regions, where they are formed faster and are thermodynamically more favored. On the other hand, polarons show a preference for ordered domains, leading to drastically different bipolaron/polaron ratios and doping/dedoping dynamics in the distinct regions. A significant enhancement of the electronic conductivity is evident when bipolarons start forming in the disordered regions, while the presence of bipolarons in the ordered regions is detrimental for transport. This study provides significant advances in the understanding of the impact of morphology on the electrochemical doping of conjugated polymers and the induced increase in conductivity.
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