Patent ID: 6162674
Filing Date: 2000-12-19
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising;a first step of forming an isolation region separating a first element region from a second element region on a semiconductor substrate;a second step of forming a first gate insulation film on said first element region and second element region;a third step of forming a conductive film on the entire surface of said semiconductor substrate, and also forming an anti-oxidation film on said conductive film;a fourth step of selectively etching said conductive film and said anti-oxidation film to be patterned, thereby forming a first precursor film later to be a first gate electrode of a first MOS structure having a first conductive film and an anti-oxidation film and its end stranded on said isolation region on said first element region, and at the same time exposing a surface of said second element region;a fifth step of oxidizing said exposed surface of said second element region to form a second gate insulation film;a sixth step of forming a second precursor film later to be a second gate electrode of a second MOS structure such that the end of said second precursor film strands on said end of said first precursor film formed on said isolation region on said second element region; anda seventh step of patterning said first precursor film and said second precursor film such that said first gate electrode of said first MOS structure is left on said first element region, said second gate electrode of said second MOS structure is left on said second element region and a conductive film formed of a portion where said end of said second precursor film overlaps said end of said first precursor film is left on said isolation region.