Beyond Capacitance Ratio: Electrolyte Voltage Division and a New Impedance Model for Organic Electrochemical Transistors
ACS Applied Materials & Interfaces, vol. 18, pp. 41355–41365
Abstract
Organic electrochemical transistors (OECTs) can be optimized by tuning the gate-channel capacitance ratio via geometry or materials. However, electrolyte properties also critically influence performance, which is a phenomenon unexplained by capacitive models alone. This study demonstrates that varying electrolyte concentration modulates the on-state current (Ion), the off-state current (Ioff), the on-off ratio (Ion/Ioff), and the threshold voltage (VT). We propose a new impedance-based model incorporating both capacitive coupling and resistive voltage division across the electrolyte to explain these effects. This model successfully predicts and verifies a frequency-dependent VT shift under high-frequency signals. Leveraging this insight, we demonstrate that appropriately increasing the gate DC bias compensates for this shift, thereby enhancing transconductance in high-frequency applications.
Authors 8
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Qinyu Hu Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich , , ,
RWTH Aachen University , , ,
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Affiliation as printed
Forschungszentrum Jülich , , ,
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Affiliation as printed
Forschungszentrum Jülich , , ,
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Affiliation as printed
Forschungszentrum Jülich , , ,
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Sven Ingebrandt Aachen
Affiliation as printed
RWTH Aachen University , , ,
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Francesca Santoro Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich , , ,
RWTH Aachen University , , ,
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Affiliation as printed
Forschungszentrum Jülich , , ,
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Dirk Mayer corresponding
Affiliation as printed
Forschungszentrum Jülich , , ,
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