Patent ID: 6632345
Filing Date: 2003-10-14
Classification: H01L,H05K

Abstract:
A method of forming copper interconnect structures, comprising:providing a workpiece having a dielectric layer, a plurality of submicron micro-recesses in the dielectric layer, a first layer that conforms to the submicron micro-recesses, and a copper seed layer that conforms to the first layer, the seed layer having a thickness of approximately 50 Ã¥ to 500 Ã¥, and the seed layer being a non-continuous layer with voids over portions of the first layer; filling the voids within the non-continuous seed layer with additional copper to form a conformal seed layer that covers substantially all of the first layer by contacting the non-continuous seed layer with an alkaline solution containing copper; electroplating copper onto the conformal seed layer in an acidic solution containing copper to fill the micro-recesses with copper; and wherein contacting the workpiece with the alkaline solution further comprises an electroplating processes in which an electrical current is passed through the seed layer.