TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The polymer additive is decomposed by radiation or heating the casted first solution to a temperature at or above the decomposition temperature of the polymer additive. The decomposition temperature of the polymer additive is less than or equal to 400 degrees C. The polymer additive produces a larger viscosity value of the first solution than that of the solution without the polymer by at least 0.2 cps. The device is coated with benzoporphyrin prior to casting the first solution. The method further involves casting a second solution, where the second solution comprises a second compound selected from fullerene (C60), C70, C76, C80, C84, and (6,6)-phenyl-C61-butyric acid n-butyl ester (PCBNB), 6,6-phenyl C61-butyric acid methyl ester (PCBM), and 1,4-bis(dimethylphenylsilylmethyl)(60)fullerene (SIMEF) derivatives of C60, C70, C76 C80 and C84. The first solution is effectively deposited on the device using inkjet printing and slot or blade coating. Preferred Components: The polymer additive is either a linear or block copolymer. The polymer additives are selected from polyethers, polyacrylates, polyisocyanurates, aliphatic polycarbonates, polyethylene carbonates, polyesters, polysulfones and polystyrene or poly( alpha methyl styrene); or poly carbonate, poly-phenylene oxide, poly(methyl methacrylate), poly(4-vinyl phenol), poly(4-vinyl pyridine), polyaldehyde, and poly(lactide-co-glycolide). The poly carbonate is of formula -(O-C(=O)-O-R)n-. The organic semiconductor or its precursor is a compound with a molecular weight of greater than or equal to 2000. The organic semiconductor or its precursor is porphyrin or phthalocyanine. The organic semiconductor is a polymer. The polymer is selected from (poly(3-hexylthiophene) (P3HT), poly(2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV), poly(2,5-bis(3-tetradecylthiophen-2yl)thieno(3,2-b)thiophene) (PBTTT), PDBTTT and poly(N-9'-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)) (PCDTBT). The organic semiconductor precursor is the compound (I) or (II). The organic semiconductor precursor is 1,4:8,11:15,18:22,25-tetraethano-29H,31H-tetrabenzo(b,g,l,q)porphyrin; or is selected from porphyrin, phthalocyanine, C60, C70, C76, C80 and C84 and their respective derivatives.R=bivalent, alkanediyl, alkenediyl or alkynediyl group with less than 10C;n=not defined. EXAMPLE - No suitable example given.