A theoretical model for the time varying current in organic electrochemical transistors in a dynamic regime

• Developed a theoretical model for charge transport in OECT under alternate external voltage in dynamic regime.
• Dynamic regime can be used to derive time varying response generated by PEDOT:PSS OECT devices.
• Simulated output of the system displays high sensitivity on ions charge, size and concentration, and on device frequency.
• Proposed model analyzes the activity of OECT devices to derive physical characteristics of individual species in a solution.

The dynamic interaction between cations and doped conductive polymer is at the basis of the working principles of organic electrochemical transistor devices. In this letter, we describe a theoretical model for the transport of saline ions in an electrolyte under the influence of an external voltage in a dynamic regime. We show how this scheme can be used to derive the time varying response and current generated by a conductive PEDOT:PSS polymer based OECT device interacting with those ions. The simulated output of the system displays a very high sensitivity on the parameters of the process including charge, size and concentration of the ions, and the frequency of operation of the device. The proposed model can be used to analyze the activity of an OECT device to derive the physical characteristics of individual species in a solution.

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