Patent ID: 8911643

Claim:
A polishing liquid which is used for chemical mechanical polishing of a body to be polished in a planarization process for manufacturing of a semiconductor integrated circuit, the body to be polished comprising at least a first layer containing polysilicon or modified polysilicon and a second layer containing at least one selected from the group consisting of silicon oxide, silicon nitride, silicon carbide, silicon carbonitride, silicon oxycarbide, and silicon oxynitride, the polishing liquid having a pH of 1.5 to 7.0, consisting of (1) colloidal silica particles, (2) an organic acid, (3) an anionic surfactant, a pH adjustor, and water, and being capable of selectively polishing the second layer with respect to the first layer, wherein the anionic surfactant is at least one compound selected from the group consisting of a sulfonate, a sulfonic acid, a sulfate, and a phosphate.