Organic semiconductor composition, photovoltaic element, photoelectric conversion device, and method of manufacturing photovoltaic element

An organic semiconductor composition including an electron donating organic semiconductor, an electron accepting organic semiconductor, a solvent and an additive having a boiling point higher than that of the solvent, wherein the additive has a molecular weight of about 198 or below and is one or two or more compounds selected from the group consisting of compounds represented by any one of formulae (1) to (3):

• in which in formula (1), A represents any aromatic hydrocarbon group having one ring or a heteroaromatic group having one ring, n is a natural number of 2 or more, R1s are the only substituents coupled with the A, R1s may be the same or different, and represent a methyl group, an alkoxy group or an alkanoyl group, further, at least one among a plurality of R1s is either an alkoxy group or an alkanoyl group, and where a plurality of R1s may be combined with one another to form a ring,
• in which in formula (2), B represents any aromatic hydrocarbon group having two rings or a heteroaromatic group having two rings, n is 1, R2s are the only substituents coupled with the B, R2s may be the same or different, and represent an alkyl group, an alkoxy group, an alkanoyl group or a thioalkyl group, further, at least one among R2s is any one of an alkoxy group, an alkanoyl group and a thioalkyl group, and
• in which in formula (3), C represents any aromatic hydrocarbon group having one ring or a heteroaromatic group having one ring, n is a natural number of 1 or more, R3s are the only substituents coupled with the C, R3s may be the same or different, and represent an alkyl group, an alkoxy group, an alkanoyl group or a thioalkyl group, further, at least one among R3s is a thioalkyl group, and where a plurality of R3s may be combined with one another to form a ring.