Balancing Ionic and Electronic Conduction for High‐Performance Organic Electrochemical Transistors

Savva, Achilleas; Hallani, Rawad; Cendra, Camila; Surgailis, Jokubas; Hidalgo, Tania C.; Wustoni, Shofarul; Sheelamanthula, Rajendar; Chen, Xingxing; Kirkus, Mindaugas; Giovannitti, Alexander; Salleo, Alberto; McCulloch, Iain; Inal, Sahika

doi:10.1002/adfm.201907657

Title: Balancing Ionic and Electronic Conduction for High‐Performance Organic Electrochemical Transistors

Journal Article · Tue Jan 28 00:00:00 EST 2020 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201907657· OSTI ID:1595531

^[1]; Hallani, Rawad ^[2]; Cendra, Camila ^[3]; Surgailis, Jokubas ^[1]; Hidalgo, Tania C. ^[1]; Wustoni, Shofarul ^[1]; Sheelamanthula, Rajendar ^[2]; Chen, Xingxing ^[2]; Kirkus, Mindaugas ^[2];

^[4];

^[3];

^[5];

^[1]

Organic Bioelectronics Laboratory Biological and Environmental Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
Division of Physical Sciences and Engineering KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA
Department of Chemistry Imperial College London London SW72AZ UK
Division of Physical Sciences and Engineering KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia, Department of Chemistry Imperial College London London SW72AZ UK

Abstract Conjugated polymers that support mixed (electronic and ionic) conduction are in demand for applications spanning from bioelectronics to energy harvesting and storage. To design polymer mixed conductors for high‐performance electrochemical devices, relationships between the chemical structure, charge transport, and morphology must be established. A polymer series bearing the same p‐type conjugated backbone with increasing percentage of hydrophilic, ethylene glycol side chains is synthesized, and their performance in aqueous electrolyte gated organic electrochemical transistors (OECTs) is studied. By using device physics principles and electrochemical analyses, a direct relationship is found between the OECT performance and the balanced mixed conduction. While hydrophilic side chains are required to facilitate ion transport—thus enabling OECT operation—swelling of the polymer is not de facto beneficial for balancing mixed conduction. It is shown that heterogeneous water uptake disrupts the electronic conductivity of the film, leading to OECTs with lower transconductance and slower response times. The combination of in situ electrochemical and structural techniques shown here contributes to the establishment of the structure–property relations necessary to improve the performance of polymer mixed conductors and subsequently of OECTs.

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Sponsoring Organization:: USDOE

OSTI ID:: 1595531

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 30 Journal Issue: 11; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 101 works

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