Patent ID: 7875512
Filing Date: 2011-01-25
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, the method comprising: forming a first region and a second region in a semiconductor substrate by forming an element isolation region; forming an insulating film on the semiconductor substrate in the first region and the second region; forming a first metal film on the insulating film in the first region and in the second region; removing the first metal film in the second region; forming a second metal film on the first metal film in the first region and on the insulating film in the second region; flattening top surfaces in the first region and the second region by performing a flattening process so that a top surface of the first metal film is flush with a top surface of the second metal film; and patterning the first metal film and the insulating film in the first region into a first gate structure, and patterning the second metal film and the insulating film in the second region into a second gate structure.