Patent ID: 8623587

Claim:
A cleaning method for removing at least one residue remaining in an electronic material substrate, comprising: applying a first resist on the substrate to form a first resist layer thereon; exposing the substrate comprising the first resist layer to light to obtain a first developed substrate; dry-etching the first developed substrate via the first resist layer serving as a mask to form an Al alloy wiring pattern; removing the first resist layer by ashing with plasma gas; removing a residue of the first resist by chemical treatment; laminating thereon an interlaycr insulating film layer of SiOx lo obtain a laminated substrate; thereafter applying a second resist on the laminated substrate to form a second resist layer thereon; exposing the laminated substrate comprising the second resist layer to light to obtain a second developed laminated substrate: dry-etching the second developed laminated substrate via the second resist layer serving as a mask to form a via hole in the intcrlayer insulating film layer and a barrier metal layer on the Al alloy wiring pattern; and removing the second resist layer by ashing with plasma gas, wherein a residue removing liquid composition is employed for removing the residue in at least the via hole, and the substrate is produced by laminating SiOx, a first barrier metal layer of TiN/Ti, an Al alloy layer of Al-Cu, Al-Si or Al-Si-Cu comprising at least 90% by mass of Al, and a second barrier metal layer of TiN/Ti in that order on a silicon substrate; wherein the residue removing liquid composition comprises: (A) ammonium fluoride; (B) methancsulfonic acid; (C) a compound comprising at least one carbon-carbon triple bond selected from the group consisting of 3-methyl-1-pentyn-3-ol, 1-ethynyl-1-cyclohexanol, 2-propyn-1-ol, 2-butyne-1,4-diol, 4-ethyl-1-oclyn-3-ol, 3-methyl-1-butyn-3-ol, 1-octyn-3-ol, ethynylbenzene, 3,3-dimethyl-1-butyne, 2-butyn-1-ol, 3,5-dimethyl-l-hexyn-3-ol, and 3-hexyne-2,5-diol; (D) at least one water-soluble organic solvent selected from the group consisting of polyalcohols. glycol ethers, and amides; and (E) water, wherein the content of (A), (C), (D) and (E) in the residue removing liquid composition from 0.005 to 2% by mass, from 0.1 to 10% by mass, from 60 to 75% by mass and from 5 to 38% by mass, respectively, and (B) is comprised in an amount of from 0.9 to 1.5 times, by mol of the amount of (A).