Kim Youngseok, Kim Gunwoo, Ding Bowen, Jeong Dahyun, Lee Inho, Park Sungjun, Kim Bumjoon J, McCulloch Iain, Heeney Martin, Yoon Myung-Han
School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, W12 0BZ, UK.
Adv Mater. 2022 Feb;34(7):e2107355. doi: 10.1002/adma.202107355. Epub 2022 Jan 10.
Owing to their outstanding electrical/electrochemical performance, operational stability, mechanical flexibility, and decent biocompatibility, organic mixed ionic-electronic conductors have shown great potential as implantable electrodes for neural recording/stimulation and as active channels for signal switching/amplifying transistors. Nonetheless, no studies exist on a general design rule for high-performance electrochemical diodes, which are essential for highly functional circuit architectures. In this work, generalizable electrochemical diodes with a very high current density over 30 kA cm are designed by introducing an asymmetric active layer based on organic mixed ionic-electronic conductors. The underlying mechanism on polarity-sensitive balanced ionic doping/dedoping is elucidated by numerical device analysis and in operando spectroelectrochemical potential mapping, while the general material requirements for electrochemical diode operation are deduced using various types of conjugated polymers. In parallel, analog signal rectification and digital logic processing circuits are successfully demonstrated to show the broad impact of circuits incorporating organic electrochemical diodes. It is expected that organic electrochemical diodes will play vital roles in realizing multifunctional soft bioelectronic circuitry in combination with organic electrochemical transistors.
由于具有出色的电学/电化学性能、操作稳定性、机械柔韧性和良好的生物相容性，有机混合离子电子导体作为神经记录/刺激的可植入电极以及信号切换/放大晶体管的有源通道展现出了巨大潜力。然而，对于高性能电化学二极管这一高性能电路架构所必需的器件，尚无关于其通用设计规则的研究。在这项工作中，通过引入基于有机混合离子电子导体的不对称活性层，设计出了电流密度超过30 kA/cm²的可推广的电化学二极管。通过数值器件分析和原位光谱电化学电位映射阐明了极性敏感的平衡离子掺杂/去掺杂的潜在机制，同时使用各种类型的共轭聚合物推导出了电化学二极管工作的一般材料要求。与此同时，成功展示了模拟信号整流和数字逻辑处理电路，以表明包含有机电化学二极管的电路具有广泛影响。预计有机电化学二极管将与有机电化学晶体管相结合，在实现多功能软生物电子电路中发挥至关重要的作用。
