Patent ID: 7208400

Claim:
A method of manufacturing a semiconductor device comprising: forming a first dielectric film on each of first and second regions in a semiconductor substrate; forming first and second stack films on the first dielectric film of the first and second regions respectively, each of the first and second stack films having a first electrode material layer, a second dielectric film having a thickness of 5 Å or more and 100 Å or less, and a second electrode material layer, an etching rate of the first and second electrode material layers of the first stack film being different from an etching rate of the first and second electrode material layers of the second stack film; forming a pattern on the first and second stack films; etching the second electrode material layer of each of the first and second stack films using the pattern as a mask, thereby exposing the second dielectric film of each of the first and second stack films; etching the second dielectric film of each of the first and second stack films; and etching the first electrode material layer of each of the first and second stack films, thereby forming a gate electrode in each of the first and second regions.