Patent ID: 7056803

Claim:
A method for forming a capacitor of a semiconductor device, comprising the steps of: (a) forming a nitride film for storage electrode on a semiconductor substrate; (b) forming an oxide film for storage electrode on the nitride film, wherein the oxide film for storage electrode is selected from a group consisting of a PE-TEOS (plasma enhanced tetraethyl ortho silicate) oxide film, an O 3 -TEOS (O 3 -tetraethyl ortho silicate) oxide film, an APL (advanced planarization layer) oxide film, an ALD (atomic layer deposition) oxide film and a SOG (spin on glass) oxide film; (c) selectively etching the oxide film and the nitride film to define a storage electrode region; (d) forming a conductive layer for storage electrode on the semiconductor substrate including the storage electrode region; (e) forming a gap-filling nitride film on the semiconductor substrate to fill up the storage electrode region; (f) performing a CMP process using the oxide film as a polishing stop layer to form a storage electrode, wherein the CMP process is performed using a slurry comprising 0.5˜10 wt % of an abrasive having a particle size ranging from 50 to 500 nm, 0.01˜30 wt % of NaH 2 PO 2 , 0.01˜30 wt % of an oxidizer and 0.01˜10 wt % of a pH control agent with its pH ranging from 2 to 12; and (g) removing the gap-filling nitride film.