Patent ID: 7030030

Claim:
A method of manufacturing a semiconductor integrated circuit device having a plurality of wiring layers and including a first wiring layer which is not the uppermost layer among said plurality of wiring layers and a second wiring layer higher than said first wiring layer in said plurality of wiring layers, comprising: (a) a step of depositing a first insulating film, a second insulating film, and a third insulating film in order on said first wiring layer; (b) a step of patterning a first mask film having an opening in an area in which holes will be formed on said third insulating film and etching said third insulating film under presence of said first mask film; (c) a step of removing said first mask film and depositing a fourth insulating film and a fifth insulating film in order on said third and second insulating films; (d) a step of patterning a second mask film having an opening in an area in which trenches will be formed on said fifth insulating film and etching said fifth insulating film under presence of said second mask film; (e) a step of etching said fourth insulating film by using the second mask film or said fifth insulating film as a mask, forming the trenches patterned on said fifth insulating film on said fourth insulating film, etching said second insulating film by using said third insulating film as a mask, and forming the holes patterned on said insulating film on said second insulating film; (f) a step of removing said third insulating film and said first insulating film exposed to bottoms of said trenches and holes; (g) a step of depositing a sixth insulating film on the entire surface of a semiconductor substrate including insides of said trenches and holes; (h) a step of patterning a third mask film for covering at least some of said holes; (i) a step of etching said sixth insulating film under presence of said third mask film; (j) a step of removing said third mask film and forming a conductive film for filling up said trenches and holes; and (k) a step of removing said conductive film from areas other than said trenches and forming wirings comprising said second wiring layer and a conductive member.