Patent ID: 6908858

Claim:
A method of fabricating a semiconductor device comprising steps of: forming an etching mask on a region of a semiconductor substrate and thereafter etching said semiconductor substrate through said etching mask thereby forming an opening; filling up said opening with a filler while forming said filler on said opening and on a non-opening part; forming a mask layer at least on a part of said filler located on said opening; etching a region, formed with no said mask layer, of a part of said filler located on said non-opening part by a thickness; and thereafter scraping an upper surface of said filler located on said opening and on said non-opening part stopping on said etching mask, thereby performing surface planarization, wherein the thickness to which said region of said part of said filler is etched is equal to the total of the depth of said opening and the thickness of said etching mask after formation of said opening.