Patent ID: 8008721
Filing Date: 2011-08-30
Classification: H01L

Abstract:
1. A MOS transistor comprising: a first conductive type semiconductor substrate; an element isolation oxide film formed in said semiconductor substrate; an element region formed in said semiconductor substrate while being defined by said element isolation oxide film; a gate oxide film formed over a surface of said element region; a gate electrode formed on surfaces of said element isolation oxide film and said gate oxide film; a sidewall insulating film formed so as to surround sidewalls of said gate electrode; a pair of lightly doped diffusion regions having a second type of conductivity opposite to said first type of conductivity formed in said element region positioned beneath said sidewall insulating film, said lightly doped diffusion regions being opposed to each other via inner ends thereof; and a pair of heavily doped diffusion regions having said second type of conductivity, said heavily doped diffusion regions being respectively connected to outer ends of said lightly doped diffusion regions and each having a conductivity higher than that of said lightly doped diffusion regions; wherein said gate electrode includes a pair of separate and elongated opposition parts and a connection part connecting said pair of opposition parts while said opposition parts are opposed to each other so as not to overlap said element region and said connection part overlaps said element region, and said gate oxide film does not exist beneath the opposition parts.