Patent ID: 6163046
Filing Date: 2000-12-19
Classification: H01L

Abstract:
A semiconductor device comprising a data holding part having a stacked capacitor as a capacitive element for holding data by storing charges in said stacked capacitor and a peripheral circuit part operating in association with said data holding part on a common semiconductor substrate, whereinsaid data holding part comprises,a first part of a first interlayer insulating film formed on said semiconductor substrate,a first bit line contact hole formed through said first part of said first interlayer insulating film to electrically connect a bit line formed on said first part of said first interlayer insulating film with said semiconductor substrate, said first bit line contact hole containing a first bit line buried layer of a same material as said bit line,a first part of a second interlayer insulating film formed on said first part of said first interlayer insulating film to cover said bit line,a storage node formed on said first part of said second interlayer insulating film for forming said stacked capacitor,a capacitor gate insulating film formed to cover a surface of said storage node,a plate electrode formed to cover at least said storage node and said capacitor gate insulating film,first connection means for electrically connecting said storage node with said semiconductor substrate,a first part of a third interlayer insulating film formed on said first part of said second interlayer insulating film to cover said plate electrode, anda first metal wire contact hole formed through said first part of said third interlayer insulating film to electrically connect a first metal wire layer formed on said first part of said third interlayer insulating film with said plate electrode through a first metal buried layer in the first metal wire contact hole, said first metal buried layer in the first metal wire contact hole and said plate electrode being directly connected, andsaid peripheral circuit part comprises,a first conductivity type first semiconductor region and a second conductivity type second semiconductor region selectively formed in said semiconductor substrate,a second part of said first interlayer insulating film formed on said semiconductor substrate,a second part of said second interlayer insulating film formed on said second part of said first interlayer insulating film,a second part of said third interlayer insulating film formed on said second part of said second interlayer insulating film,a second metal wire layer being formed on said second part of said third interlayer insulating film,a second metal wire contact hole formed through at least said second part of said third interlayer insulating film, with a second metal buried layer in the second metal wire contact hole connected to said second metal wire layer,a plug layer for electrically connecting said second metal buried layer in said second metal wire contact hole with said first and second semiconductor regions, said second metal buried layer and said a plug layer being directly connected, andsaid second metal wire contact hole having a depth substantially identical to that of said first metal wire contact hole.