Patent ID: 8207528

Claim:
An organic transistor comprising: a substrate; a gate electrode and a gate insulating film sequentially formed on the substrate in the stated order; and a source electrode, a drain electrode, and an organic semiconductor layer formed on at least the gate insulating film, wherein: ultraviolet light is radiated to the substrate from a side without the gate electrode, transmitted through the substrate and the gate insulating film, reflected at the gate electrode, and absorbed at the organic semiconductor layer; and conductivity of the organic semiconductor layer that has absorbed the ultraviolet light is lower than that of the organic semiconductor layer that has not absorbed the ultraviolet light, wherein: the organic semiconductor layer that has absorbed the ultraviolet light is decomposed, and a radiation amount of the ultraviolet light is more than or equal to 18.7 J/cm 2 ; and the conductivity of the organic semiconductor layer that has absorbed the ultraviolet light is less than or equal to 10% of that of the organic semiconductor layer that has not absorbed the ultraviolet light.