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      Influence of the molecular weight and size distribution of PSS on mixed ionic-electronic transport in PEDOT:PSS

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          Abstract

          Controlling the dispersity of PSS allows to control the performance of PEDOT:PSS in organic electrochemical transistors (OECTs).

          Abstract

          The commercially available polyelectrolyte complex poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is ubiquitous in organic and hybrid electronics. As such, it has often been used as a benchmark material for fundamental studies and the development of new electronic devices. Yet, most studies on PEDOT:PSS have focused on its electronic conductivity in dry environments, with less consideration given to its ion transport, coupled ionic-electronic transport, and charge storage properties in aqueous environments. These properties are essential for applications in bioelectronics (sensors, actuators), charge storage devices, and electrochromic displays. Importantly, past studies on mixed ionic-electronic transport in PEDOT:PSS neglected to consider how the molecular structure of PSS affects mixed ionic-electronic transport. Herein, we therefore investigated the effect of the molecular weight and size distribution of PSS on the electronic properties and morphology of PEDOT:PSS both in dry and aqueous environments, and overall performance in organic electrochemical transistors (OECTs). Using reversible addition–fragmentation chain transfer (RAFT) polymerization with two different chain transfer agents, six PSS samples with monomodal, narrow ( Đ = 1.1) and broad ( Đ = 1.7) size distributions and varying molecular weights were synthesized and used as matrices for PEDOT. We found that using higher molecular weight of PSS ( M n = 145 kg mol −1) and broad dispersity led to OECTs with the highest transconductance (up to 16 mS) and [ μC*] values (∼140 F cm −1 V −1 s −1) in PEDOT:PSS, despite having a lower volumetric capacitance ( C* = 35 ± 4 F cm −3). The differences were best explained by studying the microstructure of the films by atomic force microscopy (AFM). We found that heterogeneities in the PEDOT:PSS films (interconnected and large PEDOT- and PSS-rich domains) obtained from high molecular weight and high dispersity PSS led to higher charge mobility ( μ OECT ∼ 4 cm 2 V −1 s −1) and hence transconductance. These studies highlight the importance of considering molecular weight and size distribution in organic mixed ionic-electronic conductor, and could pave the way to designing high performance organic electronics for biological interfaces.

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          A non-volatile organic electrochemical device as a low-voltage artificial synapse for neuromorphic computing

          A neuromorphic device based on the stable electrochemical fine-tuning of the conductivity of an organic ionic/electronic conductor is realized. These devices show high linearity, low noise and extremely low switching voltage.
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                Author and article information

                Contributors
                Journal
                PCOHC2
                Polymer Chemistry
                Polym. Chem.
                Royal Society of Chemistry (RSC)
                1759-9954
                1759-9962
                May 17 2022
                2022
                : 13
                : 19
                : 2764-2775
                Affiliations
                [1 ]Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware, 19716, USA
                [2 ]Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, 19716, USA
                [3 ]Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
                [4 ]Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
                [5 ]X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60611, USA
                [6 ]Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, USA
                [7 ]Simpson Querrey Institute, Northwestern University, Chicago, Illinois 60611, USA
                [8 ]Department of Biomedical Engineering, University of Delaware, Newark, Delaware, 19716, USA
                Article
                10.1039/D2PY00271J
                36189107
                19dce892-67ab-4066-84b7-e0b29c0a393e
                © 2022

                http://rsc.li/journals-terms-of-use#chorus

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