2D Covalent Organic Frameworks as Robust n-Type Organic Mixed Ionic-Electronic Conductors for Electrochemical Transistors.

Authors

Wenkai Zhao, Junyi Han, Guangen Fu, Yiming Wang, Quanxing Yao, Ling Yin, Yuxiang Zhao, Shengxu Li, Qiang Ma, Guohui Gao, Wan Yue, Xiaojian Zhu, Paolo Samorì, Tao Zhang

Published in

Angewandte Chemie (International ed. in English). Pages e74084. Sep 02, 2026. Epub Sep 02, 2026.

Abstract

Organic mixed ionic-electronic conductors (OMIECs) with exclusive electrochemical modulation and coupling between ions and electrons have exhibited intriguing efficiencies in bioelectronics, logic circuits, and wearable devices. However, OMIECs are typically linear polymers whose excessive structural swelling and morphological disorder during electrochemical doping led to low performance and instability. Here, we report n-type 2D covalent organic frameworks (2D COFs) as novel OMIECs (BTID-BFDO COF and BTDD-BFDO COF). The rigid π-conjugated scaffold functions as both a charge transport pathway and an ion-electron coupling plane, whilst the nanochannels serve as directional conduits for rapid ion transport. 2D OMIECs-based OECTs exhibit favorable threshold voltages (< 0.5 V), I_on/I_off ratios (10³) and high stability (modulation current retention rate of 91.3% during continuous operation) compared with the linear counterpart (< 10%). More importantly, we elucidate the mechanism underlying in situ ion transport and doping within the rigid porous architectures of 2D OMIECs, establishing a novel design paradigm for robust n-type organic semiconductors.

PMID:
42683812
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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