Patent ID: 6974767

Claim:
A method of fabricating a semiconductor device, having a copper-zinc alloy (Cu—Zn) film formed on a copper (Cu) surface by electroplating the Cu surface in a chemical solution, comprising the steps of: providing a semiconductor substrate having a Cu surface; providing a chemical solution, wherein the chemical solution comprises at least one wetting agent for stabilizing the chemical solution, wherein the at least one wetting agent is provided in a concentration less than 0.1 g/L, wherein the at least one wetting agent is dissolved in a volume of deionized (DI) water; electroplating the Cu surface in the chemical solution, thereby forming a Cu—Zn alloy film on the Cu surface, wherein the chemical solution does not etch the Cu surface; rinsing the Cu—Zn alloy film in a solvent; drying the Cu—Zn alloy film under a gaseous flow; wherein the Cu—Zn alloy film has a zinc (Zn) content in a concentration less than 1.0 atomic %.