Patent ID: 6753251
Filing Date: 2004-06-22
Classification: C25D,H01L

Abstract:
A method of depositing a material on a microelectronic workpiece, comprising:placing a microelectronic workpiece having sub-micron recesses in an electroprocessing solution having copper ions; providing a first current density to the microelectronic workpiece during a first stage of a plating cycle to plate a first amount of copper into at least a portion of the sub-micron recesses in the workpiece, the copper having a sufficiently small grain size to deposit a plurality of grains of copper within a sub-micron recess; providing a second current density to the microelectronic workpiece during a second stage of the plating cycle after the first stage to plate a second amount of copper onto the workpiece, wherein the second current density is greater than the first current density to create a substantially higher plating rate than the first stage; and annealing the copper plated onto the workpiece during at least one of the first and second stages by heating the workpiece in an elevated temperature environment to increase the grain size of the grains of copper.