Patent ID: 7832090

Claim:
A method for forming a planar surface, comprising: providing a dielectric layer including a first planar surface having an opening formed therein and an electrically conductive structure positioned in the opening, the electrically conductive structure including a first non-planar surface disposed below the first planar surface by a first distance; depositing an adhesion layer on the first planar surface to a first thickness that is approximately two times the first distance or more, the adhesion layer completely filling the opening and conformally covering the first planar surface and the first non-planar surface, the adhesion layer is non-planar and includes a dished region positioned approximately above the opening and recessed by a second distance; chemically and mechanically polishing (CMP) the adhesion layer to form a planar adhesion layer by applying a polishing composition including a surfactant to the adhesion layer, and movably applying a polishing pad over the polishing composition-covered surface of the adhesion layer to planarize the adhesion layer, the surfactant operative to allow the polishing composition to preferentially polish high portions of the dished region while preventing polishing of low portions of the dished region; and halting the polishing when the dished region is removed and the adhesion layer is planar.