Patent ID: 8865536

Claim:
A manufacturing method of a semiconductor device comprising: forming a first insulating material on a semiconductor substrate that comprises a first region, a second region and a third region; forming a first conductive material on the first insulating material; patterning the first conductive material and the first insulating material to expose the semiconductor substrate of the second region, to form a first insulating film on the semiconductor substrate of the first region and a first gate on the first insulating film, and to form a fourth insulating film on the semiconductor substrate of the third region and first electrode on the fourth insulating film; forming a second insulating material on the semiconductor substrate of the second region, the first gate and the first electrode; patterning the second insulating material to form a second insulating film on the first gate and to remove the second insulating material on the first electrode and the semiconductor substrate of the second region; forming a third insulating film on the semiconductor substrate of the second region and a fifth insulating film on the first electrode by oxidizing the semiconductor substrate of the second region and the first electrode after patterning the second insulating material; forming a second conductive material on the second insulating film, the third insulating film and the fifth insulating film after oxidizing the semiconductor substrate and the first electrode; patterning the second conductive material to form a second gate on the second insulating film, a third gate on the third insulating film and a second electrode on the fifth insulating film.