Organic semiconductor composition, organic thin film, and organic thin film transistor having same

An organic semiconductor composition comprising a high molecular weight compound having a carrier transport property and a low molecular weight compound,

• wherein the low molecular weight compound has a structure represented by Formula (1);
• the high molecular weight compound is a compound having a repeating unit containing an arylamine structure and a repeating unit containing a fluorene structure, or a compound having a repeating unit containing a structure represented by Formula (3c);
• and
• a content ratio of the high molecular weight compound is either from not less than 5 parts by mass to less than 30 parts by mass or from more than 70 parts by mass to not more than 95 parts by mass relative to a total of 100 parts by mass of the high molecular weight compound and the low molecular weight compound,
• wherein E represents a sulfur atom or a selenium atom, three E's may be the same or may be different from one another, and an aromatic ring in Formula (1) may have a substituent,
• wherein each of R11, R12 and R14 is independently a hydrogen atom, a halogen atom or a monovalent group.