Patent ID: 6355555
Filing Date: 2002-03-12
Classification: H01L

Abstract:
A method of forming a copper interconnect, the method comprising:forming a first sacrificial dielectric layer above a structure layer; forming an etch stop layer above the first sacrificial dielectric layer, the etch stop layer having an etch stop opening formed therein; forming a second sacrificial dielectric layer above the first sacrificial dielectric layer and above the etch stop layer; forming a first opening in the first sacrificial dielectric layer and a second opening in the second sacrificial dielectric layer; forming a copper layer above the first and second sacrificial dielectric layers and in the first and second openings; forming the copper interconnect by removing portions of the copper layer above the second sacrificial dielectric layer, leaving the copper interconnect in the first and second openings; removing the first and second sacrificial dielectric layers above the structure layer and adjacent the copper interconnect; and forming a low dielectric constant dielectric layer above the structure layer and adjacent the copper interconnect.