Patent ID: 7151025
Filing Date: 2006-12-19
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device on a semiconductor substrate having a first region and a second region, comprising the steps of: forming a transistor in said first region of said semiconductor substrate, said transistor including a pair of impurity diffusion regions and a gate electrode; forming a first insulating film over said first and second regions, said first insulating film covering said transistor in the first region; patterning said first insulating film to selectively remove said first insulating film in said second region; forming a second insulating film over said first and second regions; forming at least one contact hole through said second and first insulating film, said contact hole reaching one of said impurity diffusion regions; and forming a conductive layer in said contact hole, wherein said first region is a memory cell region, said second region is a peripheral circuit region, and said first insulating film is a silicon nitride film in which said silicon nitride film covers said memory cell region, but is removed in said peripheral circuit region.