Patent ID: 11873420
Assignee: NISSAN CHEMICAL CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H  B | IPC C  H

Claim 0:
1. A polishing composition for use in a wafer polishing process for achieving a flat polished surface having no level difference around a wafer, the polishing composition comprising silica particles, water, and a tetraalkylammonium ion, wherein:
a mass ratio of the tetraalkylammonium ion to SiO2 of the silica particles is 0.400 to 0.813:1,
a mass ratio of SiO2 dissolved in the polishing composition to SiO2 of the silica particles is 0.100 to 0.913:1,
the dissolved SiO2 is derived from a tetraalkylammonium silicate, and silicate and
the dissolved SiO2 is contained in the polishing composition in an amount of 0.1% by mass to 7.3% by mass.