Patent ID: 6790678
Filing Date: 2004-09-14
Classification: C09G,H01L

Abstract:
A method for forming a capacitor of a FeRAM, comprises:(a) forming a storage electrode contact plug connected to a semiconductor substrate through a lower insulating layer; (b) forming a diffusion barrier film on the lower insulating layer including the storage electrode contact plug; (c) forming a conductive Pt layer for a storage electrode on the diffusion barrier film; (d) forming a storage electrode by patterning a stacked structure of the diffusion barrier film and the Pt layer via a photolithography process; (e) forming an insulating film covering the storage electrode and lower insulating layer; and (f) isolating the storage electrode by performing a CMP process on the insulating film using an acidic CMP slurry until the Pt layer is exposed, wherein acidic CMP slurry has a pH ranging from 2 to 6, the CMP slurry comprises: distilled water; an abrasive selected from the group consisting of SiO2, Al2O3 and CeO2 mixed with the distilled water to form a mixture present in an amount ranging from 10 to 30 wt % of the CMP slurry; and an organic acid present in an amount ranting from 0.5 to 10 wt % of the CMP slurry.