Patent ID: 9627380
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate; a first interlayer insulating film disposed in a first region of the substrate and including a first trench; a second interlayer insulating film disposed in a second region of the substrate and including a second trench; a first gate insulating film formed along sidewalls and a bottom surface of the first trench; a second gate insulating film formed along sidewalls and a bottom surface of the second trench; at least one first work function adjusting film disposed in the first trench, and disposed on or above sidewalls and a bottom surface of the first gate insulating film; each of side portions of the at least one first work function adjusting film having a chamfered top surface, the side portions of the at least one first work function adjusting film being disposed on the sidewalls of the first gate insulating film; at least one second work function adjusting film disposed in the second trench, and disposed on or above sidewalls and a bottom surface of the second gate insulating film, each of side portions of the at least one second work function adjusting film having a chamfered top surface, the side portions of the at least one second work function adjusting film being disposed on the sidewalls of the second gate insulating film; a first adhesive film disposed in the first trench, and disposed on sidewalls and a bottom surface of the at least one first work function adjusting film; a second adhesive film disposed in the second trench, and disposed on sidewalls and a bottom surface of the at least one second work function adjusting film; a first metal gate pattern disposed on the first adhesive film and filling the first trench; and a second metal gate pattern disposed on the second adhesive film and filling the second trench, wherein the first adhesive film is further disposed on the chamfered top surface of each of the side portions of the at least one first work function adjusting film, and the second adhesive film is further disposed on the chamfered top surface of each of the side portions of the at least one second work function adjusting film, wherein each of side portions of the at least one first work function adjusting film includes an outer sidewall and an inner sidewall that end at the respective chamfered top surface of each side portion of the at least one first work function adjusting film, wherein the outer sidewall is closer to the first gate insulating film than the inner sidewall, and wherein an uppermost point of the inner sidewall is below an uppermost point of the outer sidewall.