Polythiophene was prepared electrochemically from a propylene carbonate and 0.1M thiophene solution added with a electrolyte. The optimal conditions for the polythiophene film production with the highest conductivity were sought out with respect to electrolyte type, current density, and synthetic temperature. Among three electrolytes ( TBATFB, TEATFB, TBAHFP ), TBAHFP gave the highest conductivity ($56Scm^{-1}$ ) to the film synthesized at $-20\circ \!C$. For each electrolyte, the optimal conditions turned out to be the current density of 2.5㎃/㎠ and the temperature of $-20\circ \!C$.
Various methods (Galvanostat, potentiostat, potential cycling and potential square wave generation) were used to electrogenerating polythiophene films for the study on the morphological development. When the film was synthesized by applying a constant current at the optimal condition, the film showde very dmooth surface and high conductivity.
The polythiophene films synthesized from the solution with 0.02M electrolyte at $-20\circ \!C$, following variable-range hopping model in the range of temperature from 100K to 300K.
