Patent ID: 6133105
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A method of manufacturing a borderless contact hole formed on a substrate having a pad oxide layer and a silicon nitride layer formed thereon, the method comprising the steps of:forming a trench penetrating through the silicon nitride layer and the pad oxide layer and into the substrate;forming a first oxide layer in the trench, wherein a surface level of the first oxide layer is lower than that of the substrate;forming an etching stop layer on the silicon nitride layer, a sidewall of the trench and the first oxide layer, conformally;forming a second oxide layer on the etching stop layer and filling the trench;removing a portion of the second oxide layer, a portion of the etching stop layer, the silicon nitride layer and the pad oxide layer;removing a portion of the second oxide layer in the trench and a portion of the etching stop layer in the trench to form a recess until the surface level constructed by the remaining second oxide layer and the remaining etching stop layer is lower than a surface level of the substrate;forming a source/drain region in the substrate adjacent to the trench;forming a silicide layer on a surface of the source/drain region and a sidewall of the recess;forming a dielectric layer over the substrate; andforming a contact hole penetrating through the dielectric layer and exposing a portion of the silicide layer.