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    Facilely Accessible Porous Conjugated Polymers toward High-Performance and Flexible Organic Electrochemical Transistors

    Journal: Chem. Mat., Volume 34, FEB 22, page 1666–1676

    Authors: Lan, Liuyuan; Chen, Junxin; Wang, Yazhou; Li, Peiyun; Yu, Yaping; Zhu, Genming; Li, Zhengke; Lei, Ting; Yue, Wan; McCulloch, Iain

    Organizations: National Natural Science Foundation of China [21875291, 21702240]

    Porous morphologies have shown great potential in optimizing the capacitance and charge carrier transport for semiconducting polymers in organic electrochemical transistors (OECTs). Nevertheless, it remains arduous and time-consuming to obtain such desired microstructures due to the requirement of rigorous humidity control and templates/additives. Herein, three new glycolated conjugated polymers based on a fused-ring cyclopentadithiophene (CPDT) skeleton are developed, which feature readily obtained large-area porous thin films via spin-casting from binary solvent mixtures under ambient conditions. These polymers afford fascinating capacitances reaching a maximum of 353 F cm(-3), which is the highest value reported to date for p-type OECT materials. The optimal combination of volumetric capacitance and hole mobility in a representative polymer enables the fabrication of OECTs with a high mu C* value up to 476 F cm(-1) V-1 s(-1) and a current retention of 98% upon 600 switching cycles. Moreover, the corresponding flexible OECTs exhibit exceptional mechanical stability at various bending radii down to 5 mm and under repetitive bending cycles. This work provides a simple yet effective binary solvent strategy to fabricate porous conjugated polymers for high-performance OECTs and flexible devices, which will further advance the development of organic mixed ionic-electronic conductors in OECT research fields and beyond.
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