The conductivity of the PEDOT: PSS was enhanced through adding the solvent, such as sorbitol.
The conductivity of the PEDOT: PSS was further enhanced through adding the dilute sulfuric acid again.
Figure 5 shows the sheet resistance and surface roughness of the doped PEDOT: PSS film through adding 1M [H.sub.2]S[O.sub.4].
However, the PEDOT: PSS solution was diluted with the lower molar concentration of [H.sub.2]S[O.sub.4].