Patent ID: 6091154
Filing Date: 2000-07-18
Classification: H01L

Abstract:
A semiconductor device formed on a semiconductor substrate having a first region and a second region, comprising:(a) a first wiring layer made of a first conductive layer formed in the second region of the semiconductor substrate;(b) a first insulating film covering said first wiring layer;(c) a second insulating film formed over the semiconductor substrate, covering said first insulating film;(d) a first contact hole formed through said second insulating film in the first region, said first contact hole having a first diameter and reaching the surface of the semiconductor substrate;(e) a second contact hole formed through said second insulating film in the second region, said second contact hole having a second diameter larger than the first diameter and reaching the surface of said first insulating film;(f) a first conductive plug made of a second conductive layer filled in said first contact hole;(g) a conductive side spacer made of the second conductive layer and formed on a side wall of said second contact hole; and(h) a third contact hole formed through said first insulating film positioned under said second contact hole, said third contact hole having a third diameter smaller than the second diameter and reaching said first wiring layer.