Yan Chaoyi, Xiang Lanyi, Xiao Yu, Zhang Xuefeng, Jiang Ziling, Zhang Boya, Li Chenyang, Di Siyu, Zhang Fengjiao
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, China.
Binzhou Institute of Technology, Binzhou, Shandong, China.
Nat Commun. 2024 Nov 22;15(1):10118. doi: 10.1038/s41467-024-54528-z.
Efficiently mixed conduction between ionic and electronic charges stands to revolutionize the studies in organic electrochemical transistors (OECTs). However, inefficient ion transport due to the long-range injection and migration process in the bulk film presents challenges for enhancing the steady and transient performance of OECTs. In this work, we proposed a lateral intercalation-assisted ion transport strategy to assist volumetric ion charging, by introducing a striped microstructure in the conductive channel. By precisely adjusting the ratio of lateral area (RoL), the electrical performance, indicated by the maximum transconductance versus response time (G/τ), increases progressively by over 600%. We further unveiled the mechanism for the enhanced doping uniformity and increased volume capacitance at the lateral area. Based on the universality investigation, we uncovered the effects of molecular stacking on ionic lateral intercalation transport, contributing to the high-performance OECTs and the bio-applications in the recording of dynamic electrocardiography (ECG) signals with distinct features.
离子电荷与电子电荷之间的高效混合传导有望彻底改变有机电化学晶体管（OECT）的研究。然而，由于体膜中远程注入和迁移过程导致的离子传输效率低下，给提高OECT的稳态和瞬态性能带来了挑战。在这项工作中，我们提出了一种横向插层辅助离子传输策略，通过在导电通道中引入条纹微结构来辅助体积离子充电。通过精确调整横向面积比（RoL），以最大跨导与响应时间之比（G/τ）表示的电性能逐步提高了600%以上。我们进一步揭示了横向区域掺杂均匀性增强和体积电容增加的机制。基于普遍性研究，我们发现了分子堆积对离子横向插层传输的影响，这有助于高性能OECT以及在记录具有独特特征的动态心电图（ECG）信号中的生物应用。
