Patent ID: 7041602

Claim:
A method of fabricating a semiconductor device comprising: forming a first layer on a semiconductor element; forming a second layer on said first layer, said second layer being made of a material having an etching rate which changes in accordance with kind and concentration of dopant atoms implanted therein; implanting dopant atoms into said second layer; forming a third layer on said second layer; forming one or more first openings in said third layer; etching said second layer using said third layer as a first mask, thereby forming one or more second openings in said second layer; and forming one or more contact holes in said first layer using at least said second layer as a second mask, wherein a plurality of said first openings are formed in said third aver as having a same diameter, during said forming one or more first openings, a plurality of said second openings are formed in said second layer as having different diameters, during said etching, and a plurality of said contact holes are formed in said first layer including at least one large-diameter contact hole and at least one small-diameter contact hole, during said forming one or more contact holes.