Influence of PEDOT:PSS crystallinity and composition on electrochemical transistor performance and long-term stability

Seong-Min Kim, Chang-Hyun Kim, Youngseok Kim, Nara Kim, Won-June Lee, Eun-Hak Lee, Dokyun Kim, Sungjun Park, Kwanghee Lee, Jonathan Rivnay and Myung-Han Yoon ()
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Seong-Min Kim: Gwangju Institute of Science and Technology
Chang-Hyun Kim: Gwangju Institute of Science and Technology
Youngseok Kim: Gwangju Institute of Science and Technology
Nara Kim: Gwangju Institute of Science and Technology
Won-June Lee: Gwangju Institute of Science and Technology
Eun-Hak Lee: Gwangju Institute of Science and Technology
Dokyun Kim: Gwangju Institute of Science and Technology
Sungjun Park: RIKEN Center for Emergent Matter Science (CEMS)
Kwanghee Lee: Gwangju Institute of Science and Technology
Jonathan Rivnay: Northwestern University
Myung-Han Yoon: Gwangju Institute of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Owing to the mixed electron/hole and ion transport in the aqueous environment, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)-based organic electrochemical transistor has been regarded as one of the most promising device platforms for bioelectronics. Nonetheless, there exist very few in-depth studies on how intrinsic channel material properties affect their performance and long-term stability in aqueous environments. Herein, we investigated the correlation among film microstructural crystallinity/composition, device performance, and aqueous stability in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) films. The highly organized anisotropic ordering in crystallized conducting polymer films led to remarkable device characteristics such as large transconductance (∼20 mS), extraordinary volumetric capacitance (113 F·cm−3), and unprecedentedly high [μC*] value (∼490 F·cm−1V−1s−1). Simultaneously, minimized poly(styrenesulfonate) residues in the crystallized film substantially afforded marginal film swelling and robust operational stability even after >20-day water immersion, >2000-time repeated on-off switching, or high-temperature/pressure sterilization. We expect that the present study will contribute to the development of long-term stable implantable bioelectronics for neural recording/stimulation.

Date: 2018
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DOI: 10.1038/s41467-018-06084-6

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