Patent ID: 7247549
Filing Date: 2007-07-24
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method for manufacturing a semiconductor device having a T type gate electrode, the method comprising steps of: forming a lower gate electrode of said T type gate electrode on a semiconductor substrate; sequentially forming a first insulating film and a second insulating film on said lower gate electrode, forming said first insulating film to be thicker, away from said lower gate electrode, than a height above the semiconductor substrate of said lower gate electrode, and to leave a difference in height of a film surface of said first insulating film, the difference being between the film surface over said lower gate electrode and the film surface away from said lower gate electrode, and forming said second insulating film to have such a thickness as to flatten a difference in height near said lower gate electrode; selectively removing said second insulating film by an etch back method until said first insulating film located on an upper surface of said lower gate electrode is exposed; selectively removing said first insulating film located on the upper surface of said lower gate electrode until the upper surface of said lower gate electrode is exposed; and forming an upper gate electrode of said T type gate electrode in a space from which said first insulating film is removed.