Mixed Ionic-Electronic Transport for PEDOT:PSS-Based Zero-Gated Organic Electrochemical Transistors Using Impedance Spectroscopy and Micro-Raman Imaging

Dublin Core

Título

Mixed Ionic-Electronic Transport for PEDOT:PSS-Based Zero-Gated Organic Electrochemical Transistors Using Impedance Spectroscopy and Micro-Raman Imaging

Tema

TRANSISTORES ELECTROQUIMICOS ORGANICOS
CONDUCCION IONICA
ESPECTROSCOPIA DE IMPEDANCIA
IMAGENES MICRO-RAMAN
MODELADO
BIBLIOGRAFIA NACIONAL QUIMICA
2023

Abstract

Recent studies are being focused on establishing a link between structural and mixed ionic-electronic transport properties based on the characterization of organic mixed ionic-electronic conductors (OMIECs) under operation conditions in organic electrochemical transistor (OECT) devices. Here, we report the simultaneous access to microstructural, chemical, and physical information using impedance spectroscopy and micro-Raman imaging techniques to address the mixed ionic-electronic transport mechanisms in PEDOT:PSS-based OMIECs working as OECT channel materials. We focused on the out-of-plane and inplane mixed ionic-electronic transport mechanisms and complement our experimental studies with computational simulations using molecular dynamics (MD) and density functional theory (DFT) methodologies. Our studies revealed that the out-of-plane transport is based on ionic injection and diffusion mainly associated with the formation of nanopore channels in PEDOT:PSS exhibiting sulfonic groups toward the aqueous media. Thus, we also evidenced that the dedoping is not only due to the direct interaction of positive ions with PEDOT:PSS bulk region but also indirectly by the rearrangements of sulfonic groups from PSS toward the aqueous media. The in-plane transport in the OECT channel was properly described as a mixed ionic-electronic transport, with not only ionic transport of sodium (Na+) but also hydronium (H3O+) species mainly through nanopores and PEDOT:PSS bulk regions and with electronic transport mainly through the PEDOT:PSS bulk region. Although it is shown that the electronic transport monotonically declines with increasing ionic concentration, the Na+ diluted regime (1 mM) exhibits weak selectivity compared to H3O+ species, and the Na+ concentrated regime (100 mM) induces extreme porosity in PEDOT:PSS yielding to the destruction of the device. These results introduce some particular features for PEDOT:PSS-based OECT channel materials that need to be considered not only for ionic concentration and selectivity but also other related stability issues.

Autor

Romero, Mariano
Mombrú, Dominique
Pignanelli, Fernando
Faccio, Ricardo
Mombrú, Álvaro W.

Fuente

Applied Electronic Materials, v.5. n°9, 2023. --

Editor

ACS Publications

Fecha

2023

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Formato

PDF

Extent

12 p.

Idioma

Inglés

Tipo

Artículo

Identificador

10.1021/acsaelm.3c00655

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Original Format

PDF
Fecha de agregación
April 10, 2024
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Romero, Mariano, “Mixed Ionic-Electronic Transport for PEDOT:PSS-Based Zero-Gated Organic Electrochemical Transistors Using Impedance Spectroscopy and Micro-Raman Imaging,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed July 17, 2024, https://riquim.fq.edu.uy/items/show/6778.
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