Patent ID: 7247256

Claim:
A method of treating an aluminum film formed over a silicon oxide film pattern which defines an aluminum wiring region, said method comprising forming an aluminum film on the silicon dioxide film pattern, and forming aluminum wirings within the aluminum wiring region defined within the silicon dioxide film pattern by performing a two-step chemical mechanical polishing (CMP) process, wherein the two-step CMP process comprises: performing a first CMP which removes a part of the aluminum film using a first slurry comprising a polishing agent, an oxidant, a pH control additive, and an oxide film removal retarder which reduces a removal rate of the silicon oxide film, wherein the first slurry is devoid of a defect prevention agent which inhibits at least one of scratch defects and corrosion defects at a surface of the aluminum film; stopping the first CMP when a predetermined thickness of the aluminum film remains on a top surface of the silicon dioxide film pattern; forming the aluminum wirings by performing a second CMP which removes another part of the aluminum film using a second slurry comprising a polishing agent, an oxidant, a pH control additive, an oxide film removal retarder which reduces a removal rate of the silicon oxide film, and a defect prevention agent which inhibits at least one of scratch defects and corrosion defects at a surface of the aluminum film.