Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors

The ability to operate in aqueous environments makes poly(3,4-ethylenedioxyt hiophene):poly(styrenesulfonate), PEDOT:PSS, based organic electrochemical transistors (OECTs) excellent candidates for a variety of biological applications. Current research in PEDOT:PSS based OECTs is primarily focused on...

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Main Authors: Wu, Xihu, Stephen, Meera, Hidalgo, Tania C., Salim, Teddy, Surgailis, Jokubas, Surendran, Abhijith, Su, Xiaoqian, Li, Ting, Inal, Sahika, Leong, Wei Lin
Other Authors: School of Electrical and Electronic Engineering
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Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/156802
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spelling sg-ntu-dr.10356-1568022022-05-01T02:46:47Z Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors Wu, Xihu Stephen, Meera Hidalgo, Tania C. Salim, Teddy Surgailis, Jokubas Surendran, Abhijith Su, Xiaoqian Li, Ting Inal, Sahika Leong, Wei Lin School of Electrical and Electronic Engineering School of Materials Science and Engineering Engineering::Electrical and electronic engineering Engineering::Materials::Organic/Polymer electronics Organic Electrochemical Transistors Doping The ability to operate in aqueous environments makes poly(3,4-ethylenedioxyt hiophene):poly(styrenesulfonate), PEDOT:PSS, based organic electrochemical transistors (OECTs) excellent candidates for a variety of biological applications. Current research in PEDOT:PSS based OECTs is primarily focused on improving the conductivity of PEDOT:PSS film to achieve high transconductance (gm). The improved conductivity and electronic transport are attributed to the formation of enlarged PEDOT-rich domains and shorter PEDOT stacking, but such a change in morphology sacrifices the ionic transport and, therefore, the doping/de-doping process. Additionally, little is known about the effect of such morphology changes on the gate bias that makes the maximum gm ( P Peea ak kV G G ), threshold voltage (VT), and transient behavior of PEDOT:PSS based OECTs. Here, the molecular packing and nanostructure of PEDOT:PSS films are tuned using ionic liquids as additives, namely, 1-Ethyl-3-methylimidazolium (EMIM) as cation and anions of chloride (Cl), trifluoromethanesulfonate (OTF), bis(trifluoromethylsulfonyl)imide (TFSI), and tricyanomethanide (TCM). It is demonstrated that an optimal morphology is realized using EMIM OTF ionic liquids that generate smaller fibril-like PEDOT-rich domains with relatively loose structures. Such optimal morphology improves ion accessibility, lowering the gate bias required to completely de-dope the channel, and thus enabling to achieve high transconductance, fast transient response, and at lower gate bias window simultaneously. Ministry of Education (MOE) Submitted/Accepted version This research was supported primarily by Ministry of Education (MOE) under AcRF Tier 2 grants (2018-T2-1-075 and 2019-T2-2-106) and National Robotics Programme (W1925d0106). J. S., T.C.H., and S.I. acknowledge support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2019-CRG8-4073–4095. 2022-04-25T07:04:10Z 2022-04-25T07:04:10Z 2022 Journal Article Wu, X., Stephen, M., Hidalgo, T. C., Salim, T., Surgailis, J., Surendran, A., Su, X., Li, T., Inal, S. & Leong, W. L. (2022). Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors. Advanced Functional Materials, 32(1), 2108510-. https://dx.doi.org/10.1002/adfm.202108510 1616-301X https://hdl.handle.net/10356/156802 10.1002/adfm.202108510 1 32 2108510 en 2018-T2-1-075 2019-T2-2-106 W1925d0106 Advanced Functional Materials This is the peer reviewed version of the following article: Wu, X., Stephen, M., Hidalgo, T. C., Salim, T., Surgailis, J., Surendran, A., Su, X., Li, T., Inal, S. & Leong, W. L. (2022). Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors. Advanced Functional Materials, 32(1), 2108510-, which has been published in final form at https://doi.org/10.1002/adfm.202108510. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Engineering::Materials::Organic/Polymer electronics
Organic Electrochemical Transistors
Doping
spellingShingle Engineering::Electrical and electronic engineering
Engineering::Materials::Organic/Polymer electronics
Organic Electrochemical Transistors
Doping
Wu, Xihu
Stephen, Meera
Hidalgo, Tania C.
Salim, Teddy
Surgailis, Jokubas
Surendran, Abhijith
Su, Xiaoqian
Li, Ting
Inal, Sahika
Leong, Wei Lin
Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
description The ability to operate in aqueous environments makes poly(3,4-ethylenedioxyt hiophene):poly(styrenesulfonate), PEDOT:PSS, based organic electrochemical transistors (OECTs) excellent candidates for a variety of biological applications. Current research in PEDOT:PSS based OECTs is primarily focused on improving the conductivity of PEDOT:PSS film to achieve high transconductance (gm). The improved conductivity and electronic transport are attributed to the formation of enlarged PEDOT-rich domains and shorter PEDOT stacking, but such a change in morphology sacrifices the ionic transport and, therefore, the doping/de-doping process. Additionally, little is known about the effect of such morphology changes on the gate bias that makes the maximum gm ( P Peea ak kV G G ), threshold voltage (VT), and transient behavior of PEDOT:PSS based OECTs. Here, the molecular packing and nanostructure of PEDOT:PSS films are tuned using ionic liquids as additives, namely, 1-Ethyl-3-methylimidazolium (EMIM) as cation and anions of chloride (Cl), trifluoromethanesulfonate (OTF), bis(trifluoromethylsulfonyl)imide (TFSI), and tricyanomethanide (TCM). It is demonstrated that an optimal morphology is realized using EMIM OTF ionic liquids that generate smaller fibril-like PEDOT-rich domains with relatively loose structures. Such optimal morphology improves ion accessibility, lowering the gate bias required to completely de-dope the channel, and thus enabling to achieve high transconductance, fast transient response, and at lower gate bias window simultaneously.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Wu, Xihu
Stephen, Meera
Hidalgo, Tania C.
Salim, Teddy
Surgailis, Jokubas
Surendran, Abhijith
Su, Xiaoqian
Li, Ting
Inal, Sahika
Leong, Wei Lin
format Article
author Wu, Xihu
Stephen, Meera
Hidalgo, Tania C.
Salim, Teddy
Surgailis, Jokubas
Surendran, Abhijith
Su, Xiaoqian
Li, Ting
Inal, Sahika
Leong, Wei Lin
author_sort Wu, Xihu
title Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
title_short Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
title_full Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
title_fullStr Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
title_full_unstemmed Ionic-liquid induced morphology tuning of PEDOT:PSS for high performance organic electrochemical transistors
title_sort ionic-liquid induced morphology tuning of pedot:pss for high performance organic electrochemical transistors
publishDate 2022
url https://hdl.handle.net/10356/156802
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