Patent ID: 6358821
Filing Date: 2002-03-19
Classification: C23C,H01L

Abstract:
A method of preventing copper transport on a semiconductor wafer, comprising the steps of:providing a semiconductor wafer having a front side and a backside; sputtering metal on said backside of said wafer to form a layer of metal; said metal being selected from the group comprising aluminum, aluminum-copper, aluminum-silicon, and aluminum-copper-silicon; wherein said metal is sputtered at a pressure from about 0.1 to 9000 mTorr, a DC power from about 500 to 10,000 W with a nitrogen gas flow from about 0 to 30 sccm and an argon gas flow from about 0 to 100 sccm; then depositing copper on said front side of said wafer; and further processing said wafer; whereby said metal layer binds any stray elemental copper.