Patent ID: 7052995
Filing Date: 2006-05-30
Classification: H01L

Abstract:
1. A semiconductor device manufacturing process comprising the steps of: forming dales at a surface of a substrate; forming a barrier film on the surface of the substrate in such a way that the inner walls and bottoms of the dales are covered with the barrier film; forming a buried film in such a way that the interiors of the dales are filled therewith; preparing a third slurry by mixing a first slurry having a smaller polishing rate on the buried film than on the surface of the substrate and a second slurry having a greater polishing rate on the buried film than that on the surface of the substrate; and polishing at least one of the barrier film and the buried film on the substrate, wherein: said third slurry has a sufficiently low pH so as to be a strong acid slurry, sufficiently strong so as to prevent dissolution both of the barrier film and the buried film, the polishing step comprises subjecting at least one of the barrier film and the buried film on the surface of the substrate to chemical-mechanical polishing with the third slurry, the polishing rate of said third slurry on the buried film is greater than the polishing rate of said first slurry, and the polishing rate of said third slurry on the surface of the substrate is greater than the polishing rate of said second slurry; and said third slurry has the ratio of the polishing rate on the buried film to the polishing rate on the surface of the substrate within the range of from 0.7:1 to 1.3:1.