Carboxylic Acid Functionalization Yields Solvent-Resistant Organic Electrochemical Transistors
Carboxylic Acid Functionalization Yields Solvent-Resistant Organic Electrochemical Transistors
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DOI：
10.1021/acsmaterialslett.9b00373
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发表时间：
2019-12-01
影响因子：
11.4
通讯作者：
Reichmanis, Elsa
中科院分区：
文献类型：
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作者：
Khau, Brian V.;Savagian, Lisa R.;Reichmanis, Elsa
有机电化学晶体管(OECTS)中结构-性质相互关系的发现受到少数高性能半导体聚合物家族的限制，这些聚合物家族在水介质中具有电化学活性。目前，最先进的聚合物通常具有加工性缺陷；水可加工聚合物，如poly(3，4-ethylenedioxythiophene)：poly(styrenesulfonate)(PE-DOT：PSs)需要绝缘交联剂以防止在水电解液中溶解，而乙醇化聚合物通常在有机和水溶剂中都表现出边际溶解。在这里，我们证明了羧酸功能化共轭聚合物聚[3-(4-羧丙基)-噻吩基](P3CPT)可以从水溶性前驱体加工而成，而不需要添加剂来产生在水和有机电解液中表现出电活性的耐溶剂聚合物。用P3CPT制作的器件在累积模式下表现出单极p沟道工作模式，在交指电极上的最大跨导为26+/-2ms，竞争体积电容(C*)为150+/-18F-cm(-3)，这是具有离子侧链部分的共轭聚合物中最高的。这项工作为将来使用羧酸官能化来修饰现有的p通道和n通道骨架以获得具有高度竞争力和可加工的OECT活性材料铺平了道路。
Discovery of structure-property interrelations in organic electrochemical transistors (OECTs) is limited by the small number of high-performing semiconducting polymer families that are electrochemically active in aqueous media. Currently, state-of-the-art polymers often come with processability drawbacks; aqueous-processable polymers, such as poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PE-DOT:PSS) require insulating cross-linkers to protect against dissolution in aqueous electrolyte, while glycolated polymers frequently exhibit marginal solubility in both organic and aqueous solvents. Herein, we show that the carboxylic acidfunctionalized conjugated polymer poly [3-(4-carboxypropyl)- thiophene] (P3CPT) can be processed from a water-soluble precursor, yet requires no additives to yield solvent-resistant OECTs which exhibit electroactivity in aqueous and organic electrolytes. Devices fabricated with P3CPT exhibit unipolar p-channel operation in accumulation mode, with maximum transconductance of 26 +/- 2 mS on interdigitated electrodes and competitive volumetric capacitance (C*) of 150 +/- 18 F-cm(-3), which rank amongst the highest for conjugated polymers with ionic side chain moieties. This work paves the way for future use of carboxylic acid functionalization to modify existing p- and n-channel backbones to yield highly competitive and processable OECT active materials.