Method for manufacturing organic transistor and organic transistor

A method of producing an organic transistor comprising steps of:

• forming a hydrophobic/hydrophilic pattern substrate, in which a hydrophobic/hydrophilic pattern substrate having a hydrophobic region and a hydrophilic region formed in pattern on a surface thereof is formed by using a hydrophobic substrate exhibiting hydrophobicity on a surface thereof and by forming the hydrophilic region in pattern on the hydrophobic surface;
• forming a lyophilic functional layer, in which a lyophilic functional layer, made of an insulating functional material and having higher lyophilic property to an organic solvent than that of the hydrophobic region, is formed on the hydrophilic region;
• forming an organic semiconductor layer, in which an organic semiconductor layer made of an organic semiconductor material is formed on the lyophilic functional layer by selectively coating a coating solution for forming an organic semiconductor layer, which comprises an organic semiconductor material and an organic solvent, to the lyophilic functional layer, wherein the insulating functional material has a function of improving a semiconductor characteristic of the organic semiconductor layer and a property enabling selective provision to the hydrophilic region in the step of forming a lyophilic functional layer.