Patent ID: 8236159

Claim:
A process for electrolytically processing a microfeature workpiece as the working electrode with a first processing fluid and a counter electrode comprising: contacting a surface of the microfeature workpiece with the first processing fluid, the first processing fluid comprising first processing fluid species including a metal cation, an anion, and a complexing agent wherein the complexing agent is selected from the group consisting of compounds that contain a nitrogen-containing chelating group R—NR 2 —R 1 , where R is any alkyl group, aromatic group, or polymer chain and R 1 and R 2 are H, alkyl or aryl organic groups, and a complexing agent that includes chemical compounds having at least one part with the chemical structure COOR 1 —COHR 2 R 3 where R 1 is an organic group or hydrogen covalently bound to the carboxylate group (COO), R 2 is either hydrogen or an organic group, and R 3 is either hydrogen or an organic group; contacting the counter electrode with a second processing fluid; producing an electrochemical reaction at the counter electrode; electrolytically depositing the metal cation onto the surface of the microfeature workpiece; and substantially preventing movement of anionic and complexing agent species between the first processing fluid and the second processing fluid.