4.8 Article

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

Journal

ADVANCED MATERIALS
Volume 34, Issue 7, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202107355

Keywords

mixed ionic-electronic conductors; organic diodes; organic electrochemical diodes; organic electrochemical transistors; organic rectifiers

Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) [EP/T028513/1]
  2. Royal Society
  3. Wolfson Foundation (Royal Society Wolfson Fellowship)
  4. National Research Foundation (NRF) - Korean government (MSIT) [NRF-2021R1A2C1013015, NRF-2018M3A7B4070988, NRF-2020M3D1A1030660, NRF-2020M1A2A2080748, NRF-2021R1A4A1022920]
  5. Information Technology Research Center (ITRC) support program [IITP-2021-2020-0-01461]
  6. Global Research Laboratory program [NRF-2017K1A1A2013153]
  7. GIST Research Institute (GRI)
  8. GIST
  9. EPSRC [EP/T028513/1] Funding Source: UKRI

Ask authors/readers for more resources

Organic mixed ionic-electronic conductors have great potential as implantable electrodes and active channels for circuit architectures. This study designs high-performance electrochemical diodes and elucidates the underlying mechanism and material requirements. The broad impact of organic electrochemical diodes is demonstrated.
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.

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