Patent ID: 7316772

Claim:
A method for electroplating a copper deposit onto a semiconductor integrated circuit device substrate with electrical interconnect features including submicron-sized features such that the surface has submicron-sized reliefs therein, the method comprising: immersing the semiconductor integrated circuit device substrate into an electroplating bath including ionic copper, a suppressor, an accelerator, and an effective amount of a defect reducing agent to increase an overall chloride content and an overall sulfur content of the copper deposit, wherein the defect reducing agent is a reaction product of benzyl chloride and hydroxyethyl polyethylenimine; and electroplating the copper deposit from said bath onto the substrate to superfill the submicron-sized reliefs by rapid bottom up deposition within the reliefs whereby the occurrence of protrusion defects from superfilling, surface roughness, and voiding due to uneven growth are reduced, and macro-scale planarity across the semiconductor integrated circuit device substrate is improved.