Organic semiconductor particulate material, organic semiconductor thin-film, dispersion liquid for forming organic semiconductor film, method for producing organic semiconductor thin-film, and organic thin-film transistor

A dispersion for forming an organic semiconductor film, which is useful in forming the organic semiconductor film, the dispersion comprising:

• an organic solvent comprising an aprotic polar solvent having a specific inductive capacity of from 30-60;
• and
• a fine-particulate organic semiconductor material dispersed in the organic solvent,
• wherein the fine-particulate organic semiconductor material is in a form of fine particles and is usable as an organic semiconductor material, the fine particles are fine thermotropic liquid crystal particles that undergo a phase transition into a liquid crystal state when heated to a temperature of from 50° C. to 350° C., and the fine particles comprise a perylene tetracarboxylic diimide derivative,
• wherein the perylene tetracarboxylic diimide derivative is N,N′-ditridecyl perylene tetracarboxylic diimide represented by the following structural formula (1):
• or N,N′-bis(3-(n-dodecyloxy)-n-propyl)-3,4,9,10-perylene tetracarboxylic diimide represented by the following structural formula (2):