Patent ID: 6521079
Filing Date: 2003-02-18
Classification: B24B

Abstract:
An apparatus for the chemical mechanical planarization of semiconductor wafers, said apparatus comprising closed loop slurry distribution, comprising:(a) a platform for mounting semiconductor wafers, said semiconductor wafers comprising a multiplicity of wafers, said multiplicity of wafers being simultaneously polished; (b) a means for rotating said platform for mounting semiconductor wafers, thereby providing a means for simultaneously rotating multiple wafers; (c) a cylindrical platform for mounting at least one semiconductor polishing pad over the surface thereof; (d) a means for rotating said cylindrical platform; and (e) a means for closed loop slurry distribution, comprising (i) a means for evenly distributing slurry along said cylindrical platform; and (ii) a means for controlling flow of slurry, the means of controlling flow of slurry comprising gravitational overflow of a slurry reservoir, thereby removing a need for a peristaltic pump for slurry supply, thereby further eliminating irregularities in a conventional slurry supply.