Poly(3,4-ethylenedioxythiophene) (PEDOT) was fabricated via vapor-phase polymerization (VPP) of the monomer 3,4-ethylenedioxythiophene (EDOT) with FeCl3?6H(2)O melt as the oxidant at the EDOT vapor?FeCl3?6H(2)O melt interface. Highly doped VPP-PEDOT films were formed on the oxidant melt surfaces. The morphological changes and decrease in the doping level at the VPP-PEDOT film surface were attributed to slower oxidant transport up to the surface during VPP. The doping level of VPP-PEDOT was higher when the oxidant melt was used compared to when the oxidant thin film was employed, and the maximum doping level was twice of that obtained in our previous work.