Patent ID: 6376363
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A method of forming a copper interconnection among semiconductor devices disposed on a circular semiconductor wafer, the method comprising:forming a first insulating film on an entire surface of the semiconductor wafer, and thereafter together with forming at least one trench within an inner portion of the first insulating film by etching, removing an outer circumferential portion of the first insulating film on the semiconductor wafer, so as to make the circumference of the first insulating film smaller than the circumference of the semiconductor wafer; forming a barrier metal film and a copper film, in this order, over the entire surface of the semiconductor wafer, and thereafter polishing the barrier metal and copper films by means of chemical mechanical polishing, and thereby forming a copper interconnection in said trench; and forming a second insulating film on the entire surface of the semiconductor wafer, and thereafter, removing an outer circumferential portion of the second insulating film on the semiconductor wafer, so as to make the circumference of the second insulating film smaller than the circumference of the semiconductor wafer and larger than the circumference of the first insulating film, wherein the second insulating film is formed over polishing remains of the barrier metal film and the copper film located beyond the circumference of the first insulating film.