Patent ID: 8030193

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming a semiconductor film over a substrate; forming a first impurity region by selectively adding a first impurity element to the semiconductor film, the first impurity element having a first conductivity type; forming an insulating film over the semiconductor film; forming a first opening and a second opening by etching the insulating film; forming a mask over the insulating film to cover at least the first opening; forming a second impurity region by selectively adding a second impurity element to the semiconductor film through the second opening using the mask, the second impurity element having a second conductivity type opposite to the first conductivity type; removing the mask after forming the second impurity region; forming a first wiring electrically connected to the first impurity region through the first opening; and forming a second wiring electrically connected to the second impurity region through the second opening.