Patent ID: 8492274
Filing Date: 2013-07-23
Classification: H01L

Abstract:
1. A method of forming a metal interconnect structure, comprising steps of: forming a liner on top surfaces of a dielectric material and on sidewalls and bottom surfaces of a recessed line pattern in the dielectric material; depositing a copper seed layer on the liner; reflowing the deposited copper seed layer on the liner; filling at least a portion of the recessed line pattern with copper; forming an alloy capping layer on the copper comprising an alloying element and copper; reflowing the deposited alloy capping layer on the copper; depositing an electroplated copper layer on the reflowed alloy capping layer; planarizing the electroplated copper layer to the top surfaces of the dielectric material; and depositing a dielectric cap, wherein the alloy element in the structure is segregated and distributed along an interface between the reflowed copper and the dielectric cap.