Organic thin-film transistor and manufacturing method thereof

A manufacturing process of an organic thin-film transistor comprising a support and provided thereon, a gate electrode, an insulation layer, a source electrode, a drain electrode, and an organic semiconductor layer, the support comprising at least one of resins, and the organic semiconductor layer containing at least one of organic semiconducting materials, wherein a phase transition temperature of one of the organic semiconducting materials is not more than a glass transition point of one of the resins, the process comprising the steps of:

• providing a solution or dispersion solution of the organic semiconducting material;
• coating the solution or dispersion solution on the support or on the insulation layer to form an organic semiconductor layer;
• heat treating the resulting organic semiconductor layer;
• and
• cooling the heat treated organic semiconductor layer at a cooling speed of not more than 5° C./sec.