Patent ID: 6828222
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having Damascene wiring formed on a semiconductor, comprising the steps of:first forming an element on a semiconductor substrate, then depositing a first insulating film and flattening the first insulating film; depositing a second insulating film on the first insulating film, said second insulating film having an etching selection ratio with reference to the first insulating film; depositing third and fourth insulating films on the second insulating film, said third and fourth insulating films being formed of materials similar in kind to those of the first and second insulating films, respectively; and depositing fifth and sixth insulating films on the fourth insulating film, said fifth and sixth insulating films being formed of materials similar in kind to those of the first and second insulating films, respectively; forming first resist having a cutout pattern, said cutout pattern of the first resist having a first contact pattern in a first region and a first wiring pattern in a second region; sequentially removing the sixth, fifth, fourth and third insulating films by etching, using the first resist as a mask; forming second resist having a cutout pattern, said cutout pattern of the second resist having a second wiring pattern in the first region and a second contact pattern in the second region; and wherein the step of forming the second resist includes forming an opening pattern of the second resist in the first region to be wider than that of the first resist in the first region, and an opening pattern of the second resist in the second region to be narrower than that of the first resist in the second region, removing the sixth and fifth insulating films from the first region, and the second and first insulating films from the second region by etching, using the second resist as a mask, and simultaneously removing the second and first insulating films from the first region by etching such that the second and first insulating films are removed in accordance with the first contact pattern; and introducing a metallic material into a wiring pattern and a contact pattern, which are formed in the first and second regions, respectively, and defined by the first through sixth insulating films, thereby filling the wiring and contact patterns with the metallic material.