Ink composition and manufacturing method thereof

The invention further improves the measurement accuracy of the viscosity of the ink composition. An ink composition for forming a functional layer of an organic photoelectric conversion element, in which the electron spin concentration per 1 L volume is 250 * 1016 or less. An ink composition may include a solvent and a p-type semiconductor material. The p-type semiconductor material may be an ink composition in which the p-type semiconductor material contains a polymer compound having an electron spin concentration of 70 * 1016 or less per 1 g by weight. The ink composition may be an ink composition in which the solvent contains one or more organic solvents and the p-type semiconductor material contains a pi-conjugated polymer compound containing a donor structural unit and an acceptor structural unit. 本发明进一步提高油墨组合物的粘度的测定精度。一种用于形成有机光电转换元件的功能层的油墨组合物，其中，每1L体积的电子自旋浓度为250×1016以下。可以是包含溶剂和p型半导体材料的油墨组合物。可以是上述p型半导体材料包含每1g重量的电子自旋浓度为70×1016以下的高分子化合物的油墨组合物。可以是上述溶剂包含1种以上的有机溶剂，上述p型半导体材料包含π共轭高分子化合物的油墨组合物，该π共轭高分子化合物包含供体结构单元