TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Properties: The penetration depth of the non-solvent in the optical active layer is less than 50% in a time period of 1-60 minutes. The thickness of optical active layer is 50-300 nm. The organic layer consists of a buffer layer having a thickness of 1-60 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The non-solvent is water, hydrocarbon, halo-hydrocarbon, ether, ketone, ester, nitrogen compound, sulfide, acid, alcohol, phenol compound, and/or polyol compound. The alkane is n-butane, b-pentane, n-hexane, n-octane, isooctane, n-dodecane, dichloromethane, cyclohexane and/or methyl-cyclohexane. The halo-hydrocarbon is dichloromethane, 1,1-dichloroethane, chloroform, trichloroethylene, carbon tetrachloride, chlorobenzene and/or o-dichlorobenzene. The ether is tetrahydrofuran, 1,4-dioxane, diethyl ether, and/or dibenzyl ether. The ketone is acetone, methyl ethyl ketone, cyclohexanone, diethyl ketone, acetophenone, methyl isobutyl ketone, methyl isoamyl ketone, isophorone, and/or diisobutyl ketone. The ester is ethylene carbonate, methyl acetate, ethyl formate, propylene-1,2-carbonate, ethyl acetate, diethyl carbonate, diethyl sulfate, n-butyl acetate, isobutyl acetate, 2-ethoxyethyl acetate, isoamyl acetate, and/or isobutyl isobutyrate. The nitrogen compound is acetonitrile, propionitrile, nitromethane, nitroethane, 2-nitropropane, nitrobenzene, ethanolamine, pyridine, morpholine, aniline, N-methylpyrrolidone, cyclohexylamine, quinoline, formamide, and/or N,N-dimethylformamide, preferably acetonitrile. The sulfide is carbon disulfide, dimethyl sulfoxide, and/or ethanethiol. The alcohol is methanol, ethanol, allyl alcohol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, benzyl alcohol, cyclohexanol, diacetone alcohol, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, 2-methoxyethanol, and/or 1-decanol, preferably methanol or 2-methoxyethanol. The acid is formic acid, acetic acid, benzoic acid, oleic acid, and/or stearic acid. The phenol compound is phenol, resorcinol, m-cresol, and/or methyl salicylate. The polyol is ethylene glycol, glycerol, propylene glycol, diethylene glycol, triethylene glycol, and/or dipropylene glycol. The electron acceptor material is 60-90C fullerene (derivative) having a largest unoccupied molecular orbital energy level of -2 eV to -6 eV.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compounds: The electron donating material is poly(3-hexylthiophene), (6,6)-phenyl-C-butyric acid methyl ester, or thiophene-containing polymer of formula (I). The ratio of electron donating compound and electron accepting compound is 1:10-10:1.x,y=greater than 0 and less than 1, by molar ratio;x+y=1;n=1-10000;andR10-R12=H, or alkoxy or alkyl (both optionally substituted).