Material composition for organic photoelectric conversion layer, organic photoelectric conversion element, method for producing organic photoelectric conversion element, and solar cell

It is an object of the present invention to provide a material composition for a bulk-heterojunction-type organic photoelectric conversion layer having high photoelectric conversion efficiency and durability through formation of a stable phase-separated structure by drying in a short time with high productivity and to provide an organic photoelectric conversion element, a method of producing the organic photoelectric conversion element, and a solar cell. The material composition for an organic photoelectric conversion layer contains at least a p-type conjugated polymer semiconductor material being a copolymer having a main chain including an electron-donating group and an electron-withdrawing group, an n-type organic semiconductor material having electron acceptability, and a solvent. The solvent is represented by a general formula (1).