High-Current-Density Organic Electrochemical Diodes Enabled by Asymmetric Active Layer Design

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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(-2) 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.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2022-02
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.34, no.7, pp.2107355

ISSN
0935-9648
DOI
10.1002/adma.202107355
URI
http://hdl.handle.net/10203/294788
Appears in Collection
CBE-Journal Papers(저널논문)
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