Patent ID: 6955588

Claim:
A platen for chemical mechanical planarization (CMP) of a wafer having a disk-like configuration, comprising: a platen body configured with a leading edge, a main surface comprising a disk-like configuration corresponding to that of the wafer and extending from adjacent to the leading edge along a radius to a center of the disk-like configuration of the main surface, and a shim configured with an outer circular shim wall surrounding the disk-like configuration of the main surface to define a chamber, the shim being further configured so that during a CMP operation a wafer peripheral edge is vertically aligned with the outer shim, the shim being further configured with an inner shim wall; the platen body being further configured with a cluster of fluid inlets surrounded by the inner wall and positioned adjacent to both the leading edge and the inner shim wall; and the main surface being continuous within the inner shim wall and around the cluster of fluid inlets.