TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The low molecular weight alkyl-containing molecules (0.1-10% v/v) are 1-20C alkanes substituted with hydroxy and thiol. They are preferably 1-20C dithioalkanes which are alpha , omega -substituted; or 1-20C iodoalkanes. The organic electron acceptor comprises fullerene derivative of Formula (A). The fullerene derivative is preferably (6,6) phenyl 61C-butyric acid methyl ester (PCBM) (61C-PCBM) or 71C-PCBM. The solvent used in the solution is chlorobenzene, dichlorobenzene, trichlorobenzene, benzene, toluene, chloroform, dichloromethane, dichloroethane, xylenes, alpha , alpha , alpha -trichlorotoluene, methyl naphthalene, and/or chloronaphthalene.fullerene= 60C, 70C, or 84C fullerene moiety;Ar=optionally substituted Ph or thienyl;R1=1-12C alkyl;andR2=-O-1-12C alkyl or -O-1-12C alkyl-SH.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The organic semiconductor film comprises a conjugated polymer film. It includes a conjugated polymer film electron donor and an organic electron acceptor. Preferred Methods: Forming of the conjugated polymer film from the solution is performed by spin-casting. Preferred Compounds: The conjugated polymer film electron donor comprises a polymer including polyacetylene, polyphenylene, poly(3-alkylthiophenes) with 6-16C alkyl, poly-(3-hexylthiophene), poly(2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta(2,1-b;3,4-b')-dithiophene)-alt-4,7-(2,1,3- benzothiadiazole)), polyphenylacetylene, polydiphenylacetylene, polyanilines, poly(p-phenylene vinylene) and its alkoxy derivatives, poly(2-methoxy,5-(2'-ethyl-hexyloxy)-p-phenylenevinylene), poly(2,5-dimethoxy-p-phenylene vinylene), polythiophene, poly(thienylenevinylene), poly(2,5-thienylenevinylene), polyporphyrin, porphyrinic macrocycle, thiol-derivatized polyporphyrin, polymetallocene, polyferrocene, polyphthalocyanine, polyvinylene, polyphenylvinylene, polysilane, polyisothianaphthalene, polythienylvinylene, and/or their derivative or blend.