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    Influence of disorder on transfer characteristics of organic electrochemical transistors

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    Type
    Article
    Authors
    Friedlein, Jacob T.
    Rivnay, Jonathan
    Dunlap, David H.
    McCulloch, Iain cc
    Shaheen, Sean E.
    McLeod, Robert R.
    Malliaras, George G. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2017-07-13
    Online Publication Date
    2017-07-13
    Print Publication Date
    2017-07-10
    Permanent link to this record
    http://hdl.handle.net/10754/625222
    
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    Abstract
    Organic electrochemical transistors (OECTs) are receiving a great deal of attention as transducers of biological signals due to their high transconductance. A ubiquitous property of these devices is the non-monotonic dependence of transconductance on gate voltage. However, this behavior is not described by existing models. Using OECTs made of materials with different chemical and electrical properties, we show that this behavior arises from the influence of disorder on the electronic transport properties of the organic semiconductor and occurs even in the absence of contact resistance. These results imply that the non-monotonic transconductance is an intrinsic property of OECTs and cannot be eliminated by device design or contact engineering. Finally, we present a model based on the physics of electronic conduction in disordered materials. This model fits experimental transconductance curves and describes strategies for rational material design to improve OECT performance in sensing applications.
    Citation
    Friedlein JT, Rivnay J, Dunlap DH, McCulloch I, Shaheen SE, et al. (2017) Influence of disorder on transfer characteristics of organic electrochemical transistors. Applied Physics Letters 111: 023301. Available: http://dx.doi.org/10.1063/1.4993776.
    Sponsors
    J.T.F. acknowledges support from the Graduate Assistantships in Areas of National Need Award No. P200A120063 and the NSF GRFP Award No. DGE 1144083. S.E.S. acknowledges support from the National Science Foundation Grant No. DMR-1006930. R.R.M. acknowledges support from the National Science Foundation Grant CAREER (No. ECCS 0847390). R.R.M. and S.E.S. acknowledge support from the National Science Foundation Grant No. ECCS 1509909.
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4993776
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.4993776
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4993776
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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