Method of patterning an organic thin film, an organic thin film transistor, a method of manufacturing an organic thin film transistor, and an organic electroluminescence display device having the organic thin film transistor

A method of manufacturing a thin film transistor, comprising:

• forming source and drain electrodes on a substrate;
• forming an organic semiconductor layer on the source and drain electrodes and the substrate;
• selectively printing a mask material on a portion of the organic semiconductor layer;
• patterning the organic semiconductor layer by a dry etching method using the mask material;
• forming a gate insulating film on the substrate;
• and
• forming a gate electrode on the gate insulating film.

A method of manufacturing a thin film transistor, comprising:

• forming a gate electrode on a substrate;
• forming a gate insulating film on the substrate;
• forming source and drain electrodes on the gate insulating film;
• forming an organic semiconductor layer on the substrate;
• selectively forming a mask material on a portion of the organic semiconductor layer;
• and
• patterning the organic semiconductor layer by a dry etching method using the mask material.