TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The electron acceptor material and electron donor compound are swollen to nonsolvent by heat-treating. When the photoactive layer is coated for 1-60 minutes, the penetration depth of the nonsolvent to photoactive layer is more than 5% and less than 50% of thickness of photoactive layer. The nonsolvent is chosen from water, alkane-based nonsolvent, halohydrocarbon-based nonsolvent, ether-based nonsolvent, ketone-based nonsolvent, ester-based nonsolvent, nitrogen compound-based nonsolvent, sulfide-based nonsolvent, acid-based nonsolvent, alcohol-based nonsolvent, phenol-based nonsolvent and polyol-based nonsolvent. The alkaline-based nonsolvent is chosen from N-butane, N-pentane, N-hexane, N-octane, isooctane, N-dodecane, dichloromethane, cyclohexane and methylcyclohexane. The halohydrocarbon-based nonsolvent is chosen from methane, dichloromethane, methylene chloride, 1,1-dichloroethylene, ethylene dichloride, chloroform, 1,1-dichloroethane, trichloroethylene, carbon tetrachloride, chlorobenzene and O-dichlorobenzene. The ether-based nonsolvent is chosen from tetrahydrofuran, 1,4-dioxane, diethylether and dibenzyl ether. The ketone-based nonsolvent is chosen from acetone, methyl ethyl ketone, cyclohexanone, diethylketone, acetophenone, methyl isobutyl ketone, methylisoamylketone, isophorone and diisobutylketone. The ester-based nonsolvent is chosen from ethylene carbonate, methyl acetate, ethyl formate, 1,2-propylene carbonate, ethyl acetate, diethyl carbonate, diethyl sulfate, N-butyl acetate, isobutyl acetate, 2-ethoxyethylacetate, isoamylacetate and isobutyl isobutyrate. The nitrogen compound-based nonsolvent is chosen from acetonitrile, propionitrile, nitromethane, nitroethane, 2-nitropropane, nitrobenzene, ethanol amine, ethylene diamine, pyridine, morpholine, aniline, N-methypyrrolidone, cyclohexylamine, quinoline, formamide and N,N- dimethylformamide. The sulfur-based nonsolvent is chosen from carbon disulfide, dimethyl sulfoxide and ethanethiol. The alcohol-based nonsolvent is chosen from 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 1-decanol, preferably methanol or 2-methoxyethanol. The acid-based nonsolvent is chosen from formic acid, acetic acid, benzene acid, oleic acid and stearic acid. The phenol-based nonsolvent is chosen from phenol, resorcinol, m-cresol and methyl salicylate. The polyol-based nonsolvent is chosen from ethylene glycol, glycerol, propylene glycol, diethylene glycol, triethyleneglycol and dipropylene glycol. The electron acceptor material is fullerene derivative, preferably 60-70C fullerene derivative, more preferably 76-78C fullerene derivative or 84-90C fullerene derivative with lowest unoccupied molecular orbit energy level of -2 eV to 6 eV. The electron donor compound comprises electron donor having group of formulae (a)-(o) and electron acceptor having group of formulae (q)-(x). The electron acceptor material is preferably methyl-(6,6)-phenyl C61-butyrate. The organic layer comprises buffer layer having thickness of 1-60 nm. The ratio of electron acceptor material and electron donor compound is 1:10-10:1.a=0-4;b=0-6;c=0-8;d,e=0-3;X1,X2=CRR', NR, O, SiRR', PR, S, GeRR', Se or Te;Y1-Y4=CR, N, SiR, P or GeR;R,R',R2-R5=H, D, halo, nitrile, nitro, imido, amide, hydroxy, or alkyl, cycloalkyl, alkoxy, aryloxy, alkyloxy, alkyl sulfoxy, aryl sulfoxy, alkenyl, silyl, boron, alkylamine, aralkylamine, arylamine, amine, heteroaryl, aryl, fluorenyl, carbazole or heterocyclyl (having heteroatom chosen from N, O or S) (all optionally substituted);andor R2+R3,R+R',R4+R5=condensed ring.Preferred Property: The thickness of the photoactive layer is 50-300 nm. Preferred Process: The manufacture of organic cell further involves heat-treating process at temperature of more than glass transition temperature of electron donor compound.