Patent ID: 8227691

Claim:
A method, comprising: processing a solution to form a photoactive layer, the solution comprising an electron donor material, an electron acceptor material, a compound, and a solvent, the compound being different from the solvent and being selected from a group consisting of an alkane substituted with halo, CN, or COOR, R being H or C 1 -C 10 alkyl; a cyclopentadithiophene optionally substituted with C 1 -C 10 alkyl; a fluorene optionally substituted with C 1 -C 10 alkyl; a thiophene optionally substituted with C 1 -C 10 alkyl; a benzothiadiazole optionally substituted with C 1 -C 10 alkyl; a naphthalene optionally substituted with C 1 -C 10 alkyl; and a 1,2,3,4-tetrahydronaphthalene optionally substituted with C 1 -C 10 alkyl.