Patent ID: 7615473

Claim:
A method of manufacturing a semiconductor device comprising: forming a first insulating film over a substrate; forming a semiconductor film over the first insulating film; forming a second insulating film over the semiconductor film; forming a mask comprising an organic film over the second insulating film; baking the organic film; generating a dissociated gas from the baked organic film by introducing ions imparting n-type with a first acceleration voltage and a first current density; evacuating a gas dissociated from the mask after introducing the ions; and forming an impurity region by introducing the ions imparting n-type into the semiconductor film with a second acceleration voltage and a second current density after evacuating the dissociated gas, wherein the first acceleration voltage is higher than the second acceleration voltage, wherein the first current density is lower than the second current density, and wherein the step of introducing the ions is conducted by on-doping or ion implantation.