  This work presents an original concept directed to implement an
unconventional methodology where a device is produced by integrating a
solid-state circuitry concept and an electrochemistry cell. In our experimental
system an organic semiconductor, (PCPDT-BT), serves both as the gate and
working electrode. Gating is obtained via electrochemical polarization
exploiting a conventional three electrodes electrochemical cell placed on top
of a traditional source/drain/gate solid-state device configuration.
Source/drain conduction is probed via impedance measurement (electrochemical
impedance spectroscopy, EIS) performed as a function of time at constant
frequency, under constant potential control. The conductivity of the PCPDT-BT
is due to the polaronic state induced via application of a suitable
electrochemical potential (in the oxidation regime), as it is proved by
infrared (IR) spectra recorded in-situ/in-operando (in attenuated under total
reflection, ATR, mode) upon both electrochemical and chemical ionization/doping
of the PCPDT-BT.
