A process for preparing a mixed solvent adhesive solution involving mixing an alcohol and an adhesive to form an adhesive solution; mixing a charge transporting molecule and a solvent other than alcohol to form a charge transport solution; mixing the charge transport solution with the adhesive solution to form a mixed solvent solution; mixing an electrically conductive filler and a solvent to form a filled solvent solution; and mixing the filled solvent solution to the mixed solvent solution so as to form a mixed solvent adhesive solution.