Patent ID: 7005382
Filing Date: 2006-02-28
Classification: C09G,H01L

Abstract:
1. A chemical mechanical polishing process comprising a step of polishing a surface to be polished formed of polysilicon film or an amorphous silicon film, with an aqueous dispersion obtained by mixing at least a water-soluble quaternary ammonium salt, a basic organic compound other than the water-soluble quaternary ammonium salt, an inorganic acid salt, a water-soluble polymer and abrasive grains into an aqueous medium, wherein a specific removal rate ratio represented by a ratio of the removal rate of the polysilicon film or the amorphous silicon film to the removal rate of a silicon oxide film in the case where the silicon oxide film and the polysilicon film or the amorphous silicon film are polished under the same condition, is at least 30.