Patent ID: 6812536
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate; source and drain regions selectively formed in an upper layer portion of said semiconductor substrate; a gate oxide film formed on said semiconductor substrate at least in a region between said source and drain regions; and a gate electrode formed on said gate oxide film and including at least polysilicon layer, wherein said gate oxide film has a first region located beneath an edge of said gate electrode and a second region located beneath a center of said gate electrode, a film thickness of said first region of said gate oxide film is larger than a film thickness of said second region of said gate oxide film, and said source and drain regions, said gate oxide film and said gate electrode cooperatively comprise a MOS transistor, said semiconductor device further comprising: an anti-oxidizing film, having a small oxygen diffusion rate compare with said polysilicon layer, which covers and is in direct contact with outer surfaces of said gate electrode so that said gate electrode is not exposed.