Patent ID: 6287973
Filing Date: 2001-09-11
Classification: H01L

Abstract:
A method for forming an interconnection structure, comprising the steps of:a) forming a first insulating film over a lower-level metal interconnect;b) forming a second insulating film over the first insulating film;c) forming a thin film over the second insulating film;d) forming a first resist pattern on the thin film, the first resist pattern having a first opening for forming a wiring groove;e) etching the thin film using the first resist pattern as a mask, thereby forming a mask pattern of the thin film which has a second opening for forming the wiring groove;f) removing the first resist pattern, and thereafter forming a second resist pattern over the second insulating film, the second resist pattern having a third opening for forming a contact hole;g) dry-etching the first and second insulating films using the second resist pattern as a mask, thereby forming the contact hole in the first insulating film;h) removing the second resist pattern, and thereafter dry-etching the second insulating film using the mask pattern of the thin film as a mask, thereby forming the wiring groove in the second insulating; andi) filling in the wiring groove and the contact hole with a metal film, thereby forming an upper-level metal interconnect and a contact connecting the lower-level metal interconnect and the upper-level metal interconnect together.