A method for manufacturing an organic semiconductor device having enhanced
uniformity of light-emission and excellent luminance with relatively low
driving voltage by a wet process is disclosed. The method for
manufacturing an organic semiconductor device, comprises the steps of:
forming a first electrode on a substrate; forming an organic
semiconductor layer including an ionic salt by coating an organic
compound solution on the first electrode and removing an organic solvent
from the coated organic compound solution, wherein the organic compound
solution includes the organic solvent, the ionic salt and organic
semiconductor compounds; forming a second electrode having the opposite
electric potential to the first electrode on the organic semiconductor
layer including the ionic salt; and treating the organic semiconductor
layer including the ionic salt with thermal annealing and electrical
annealing simultaneously.