Patent ID: 7192835

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming a metal silicate film on an underlying material containing silicon, said metal silicate film containing, as main chemical elements, silicon, oxygen and one, two or more of metallic element or elements selected from the group consisting of Hf, La, Zr and Al: and removing said metal silicate film to expose said underlying material, wherein said metal silicate film is removed during said removal of said metal silicate film by employing a chemical liquid solution containing one or more solvent or solvents selected from the group consisting of an ether-type organic solvent, N-methylpyrrolidone (NMP), propylene carbonate, butyrolactone, dimethylsulfoxide (DMSO), dimethylacetamide and dihydrofurfuryl alcohol (THFA), and hydrofluoric acid or a salt thereof.