Peculiar transient behaviors of organic electrochemical transistors governed by ion injection directionality

Ji Hwan Kim, Roman Halaksa, Il-Young Jo, Hyungju Ahn, Peter A. Gilhooly-Finn, Inho Lee, Sungjun Park, Christian B. Nielsen () and Myung-Han Yoon ()
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Ji Hwan Kim: Gwangju Institute of Science and Technology (GIST)
Roman Halaksa: Queen Mary University of London
Il-Young Jo: Gwangju Institute of Science and Technology (GIST)
Hyungju Ahn: Pohang Accelerator Laboratory
Peter A. Gilhooly-Finn: Queen Mary University of London
Inho Lee: Ajou University
Sungjun Park: Ajou University
Christian B. Nielsen: Queen Mary University of London
Myung-Han Yoon: Gwangju Institute of Science and Technology (GIST)

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Despite the growing interest in dynamic behaviors at the frequency domain, there exist very few studies on molecular orientation-dependent transient responses of organic mixed ionic–electronic conductors. In this research, we investigated the effect of ion injection directionality on transient electrochemical transistor behaviors by developing a model mixed conductor system. Two polymers with similar electrical, ionic, and electrochemical characteristics but distinct backbone planarities and molecular orientations were successfully synthesized by varying the co-monomer unit (2,2’-bithiophene or phenylene) in conjunction with a novel 1,4-dithienylphenylene-based monomer. The comprehensive electrochemical analysis suggests that the molecular orientation affects the length of the ion-drift pathway, which is directly correlated with ion mobility, resulting in peculiar OECT transient responses. These results provide the general insight into molecular orientation-dependent ion movement characteristics as well as high-performance device design principles with fine-tuned transient responses.

Date: 2023
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DOI: 10.1038/s41467-023-42840-z

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