Patent ID: 6683002
Filing Date: 2004-01-27
Classification: H01L

Abstract:
A method for forming an interconnect opening comprising:providing a semiconductor structure having a first dielectric layer and a lower interconnect; forming a passivation layer over said first dielectric layer and said interconnect; forming a stack dielectric layer over said passivation layer; patterning and etching said stack dielectric layer to form an upper interconnect opening; forming an interface layer of either a copper (I) compound or a copper (II) compound over the passivation layer, on side sidewalls said upper interconnect opening and on top of said stack dielectric layer; said interface layer is formed by a reaction comprising: reacting complex with a sulfide-containing compound, removing said interface layer from the stack dielectric but not from the sidewalls of said upper interconnect opening: etching the passivation layer and interface layer to open the bottom of the upper interconnect opening.