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    Influence of Water on the Performance of Organic Electrochemical Transistors

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    Type
    Article
    Authors
    Savva, Achilleas
    Cendra, Camila
    Giugni, Andrea
    Torre, Bruno
    Surgailis, Jokubas
    ohayon, David
    Giovannitti , Alexander
    McCulloch, Iain cc
    Di Fabrizio, Enzo M. cc
    Salleo, Alberto
    Rivnay, Jonathan
    Inal, Sahika cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-01-04
    Online Publication Date
    2019-01-04
    Print Publication Date
    2019-02-12
    Permanent link to this record
    http://hdl.handle.net/10754/631728
    
    Metadata
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    Abstract
    Organic electrochemical transistors (OECTs) composed of organic mixed conductors can operate in aqueous, biological media and translate low-magnitude ionic fluctuations of biological origin into measurable electrical signals. The growing technological interest in these biotransducers makes the fundamental understanding of ion-to-electron coupling extremely important for the design of new materials and devices. One crucial aspect in this process that has been so far disregarded is the water taken up by the film during device operation and its effects on device performance. Here, using a series of the same electrolyte with varying ion concentrations, we quantify the amount of water that is incorporated into a hydrophilic p-type organic semiconductor film alongside the dopant anions and investigate structural and morphological changes occurring in the film upon electrochemical doping. We show that infiltration of the hydrated dopant ions into the film irreversibly changes the polymer structure and negatively impacts the efficiency, reversibility, and speed of charge generation. When less water is injected into the channel, OECTs exhibit higher transconductance and faster switching speeds. Although swelling is commonly suggested to be a necessity for efficient ion-to-electron transduction, this work uncovers the negative impact of a swollen channel material on the performance of accumulation mode OECTs and lays the foundation for future materials design.
    Citation
    Savva A, Cendra C, Giugni A, Torre B, Surgailis J, et al. (2019) Influence of Water on the Performance of Organic Electrochemical Transistors. Chemistry of Materials 31: 927–937. Available: http://dx.doi.org/10.1021/acs.chemmater.8b04335.
    Sponsors
    J.R. acknowledges support from the National Science Foundation (Grant NSF DMR-1751308). A.S. and C.C. acknowledge support from the NSF (Grant NSF DMR-1808401). Portions of this research were performed at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.
    Publisher
    American Chemical Society (ACS)
    Journal
    Chemistry of Materials
    DOI
    10.1021/acs.chemmater.8b04335
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.chemmater.8b04335
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.chemmater.8b04335
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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