ELECTROCHEMICAL AC-IMPEDANCE MEASUREMENT OF THE ELECTRODE FABRICATED BY POLYACENIC SEMICONDUCTIVE MATERIAL

Electrochemical a.c. impedance measurement is carried out for polyacen ic semiconductive (PAS) materials prepared by pyrolytic treatment of p henol-formaldehyde resin in order to investigate the electrochemical d oping mechanism at the interface between electrode and electrolyte. Th e ionic relaxation model is introduced to understand the present resul ts. It is concluded that more than half of the dopants are trapped in the PAS electrode with relatively weak interaction, the relaxation tim e of which is 53 s. This is closely connected with the fact that the P AS battery possesses rapid charge-discharge characteristics.