The switching transient responses of organic electrochemical transistors with four basic types of imidazolium-based ionic liquids were determined. The paper describes the method of determining four transient switching parameters. Time constants of switching processes, switching ratios, residual current when the transistor is closed and the saturated value of the current in an open transistor. The best switching ratio can be found with the ionic liquid 1-butyl-3-methylimidazolium trifluoromethylsulfonate. The time constants of fast and slow processes were studied. There is currently an effort to eliminate the occurring slow processes, which will lead to a reduction of the residual current and, in general, to an acceleration of the switching process of the transistor.

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