Patent ID: 7833908

Claim:
A method for planarizing the surface of a semiconductor device, comprising: preparing a wafer where nanotopography of certain height and certain wavelength is formed in the surface thereof, and a slurry composition for chemical-mechanical polishing; forming an oxide layer of a predetermined thickness on said wafer by vapor deposition; and removing said oxide layer so as to planarize the surface and to control a deviation of thickness of said oxide layer below a certain level by chemical mechanical polishing process using said slurry composition, wherein said slurry composition includes abrasive particles of ceria, a dispersant, an anionic organic additive, and a pH adjuster, said abrasive particles of ceria are prepared by a solid displacement reaction method, in which a size of said abrasive particles contained in said slurry composition is controlled to be within a range from 2 nm to 1000 nm, a concentration of said anionic organic additive is controlled to be within a range from 0.05% to 0.8% by weight, the pH of said slurry composition is adjusted to approximately 7.0, and in the preparing of said slurry composition, the size of said abrasive particles of ceria and the concentration of said anionic organic additive contained in said slurry composition are controlled within predetermined ranges in order to control the deviation of thickness of said oxide layer below a certain level.