abstract |
The present invention includes a conjugated polymer compound, a fullerene derivative, a first solvent and a second solvent, and when the total of the weight of the first solvent and the weight of the second solvent is 100, the weight of the first solvent 70 to 97, the surface tension at 25 ° C of the first solvent is greater than 25 mN / m, and the surface tension at 25 ° C of the second solvent is 15 to 25 mN / m. |