Moreover, water-miscible solvents, for example alcohols such as methanol and isopropanol, ketones such as acetone and methyl ethyl ketone, cycloaliphatic amides such as N-methylpyrrolidone and N-methylcaprolactam, aliphatic amides such as N,N-dimethylacetamide, or mixtures thereof can be added to the solution of the conductive polymer.