Preparation of Resilient Organic Electrochemical Transistors Based on Blend Films with Flexible Crosslinkers

Kindaichi, Shuhei; Matsubara, Ryosuke; Kubono, Atsushi; Yamamoto, S.; Mitsuishi, Masaya

doi:10.26434/chemrxiv-2023-zztqm

Cited by 3 publications

(1 citation statement)

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“…A similar effect was also reported for PEDOT:DBSA blended with GOPS . Alternative cross-linkers such as poly(ethylene glycol)diglycidyl ether (PEGDE) , and divinylsulfone (DVS) have been explored to attain water-stable PEDOT:PSS films while maintaining their electronic and ionic conductivity. However, in the absence of GOPS, PEGDE and DVS cross-linked PEDOT:PSS thin films were shown to delaminate from substrates. , This lack of aqueous stability can be explained by the absence of silane anchoring groups to maintain adhesion to the substrates.…”

Section: Introductionsupporting

confidence: 56%

Surface Functionalization with (3-Glycidyloxypropyl)trimethoxysilane (GOPS) as an Alternative to Blending for Enhancing the Aqueous Stability and Electronic Performance of PEDOT:PSS Thin Films

Osazuwa,

Lo,

Feng

et al. 2023

ACS Appl. Mater. Interfaces

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Organic mixed ionic−electronic conductors, such as poly (3,4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), are essential materials for the fabrication of bioelectronic devices due to their unique ability to couple and transport ionic and electronic charges. The growing interest in bioelectronic devices has led to the development of organic electrochemical transistors (OECTs) that can operate in aqueous solutions and transduce ionic signals of biological origin into measurable electronic signals. A common challenge with OECTs is maintaining the stability and performance of the PEDOT:PSS films operating under aqueous conditions. Although the conventional approach of blending the PEDOT:PSS dispersions with a cross-linker such as (3glycidyloxypropyl)trimethoxysilane (GOPS) helps to ensure strong adhesion of the films to device substrates, it also impacts the morphology and thus electrical properties of the PEDOT:PSS films, which leads to a significant reduction in the performance of OECTs. In this study, we instead functionalize only the surface of the device substrates with GOPS to introduce a silane monolayer before spin-coating the PEDOT:PSS dispersion on the substrate. In all cases, having a GOPS monolayer instead of a blend leads to increased electronic performance metrics, such as three times higher electronic conductivity, volumetric capacitance, and mobility− capacitance product [μC*] value in OECT devices, ultimately leading to a record value of 406 ± 39 F cm −1 V −1 s −1 for amorphous PEDOT:PSS. This increased performance does not come at the expense of operational stability, as both the blend and surface functionalization show similar performance when subjected to pulsed gate bias stress, long-term electrochemical cycling tests, and aging over 150 days. Overall, this study establishes a novel approach to using GOPS as a surface monolayer instead of a blended cross-linker, for achieving high-performance organic mixed ionic−electronic conductors that are stable in water for bioelectronics.

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