| abstract |
A method for producing an organic photovoltaic element with an organic photo-active layer comprising a conjugated block copolymer comprising a polymer A block containing a thiophene group and a polymer B block containing a thiophene group, or a polymer composition comprising a conjugated polymer A containing a thiophene group and a conjugated polymer B containing a thiophene group, wherein the difference between the melting points of the polymers being 10 degrees Centigrade or more, and a fullerene derivative, and wherein the method includes a process of exposing an organic photo-active layer to a vapor of solvent having a surface tension between a surface tension of the conjugated polymer (A or B) containing a thiophene group and a surface tension of the fullerene derivative. |