Thin films of CoPc of various thickness have been deposited onto glass
substrates using thermal evaporation technique at room temperature. The dark
electrical resistivity measurements were carried out at different
temperature range (298–423 K). An estimation of mean free path ($\ell_{0}$) of charge
carriers in CoPc thin films and bulk resistivity, $\rho_{B}$ was
attempted. Measurements of thermoelectric power confirm that CoPc thin
films behave as p-type semiconductors. The ac conductivity (σac) has been investigated in the frequency range (102–106 Hz) and temperature range (298–407 K). σac is found to be proportional to ωs where s ≈ 0.879 which is frequency and temperature independence. The ac conductivity
interpreted by the correlated barrier hopping (CBH) model with centers of
intimate valence alternation pairs type with a maximum barrier height, WM ≈ 1.594 eV.