Etching solution for copper or copper alloy
A solution for selectively etching copper or a copper alloy from a microelectronic device, wherein the device simultaneously includes copper or a copper alloy and nickel-containing material, the solution being an etching solution for copper or a copper alloy comprising a chelating agent having an acid group in a molecule, hydrogen peroxide, and a surfactant having an oxyethylene chain in a molecule.
1. A method for producing a microelectronic device, the method comprising contacting a microelectronic device simultaneously including copper or a copper alloy and nickel-containing material with a solution consisting of at least one chelating agent (A) having an acid group in a molecule, hydrogen peroxide (B), at least one surfactant (C) having an oxyethylene chain in a molecule, and at least one solvent (D),
wherein the pH of the solution is in a range from about 0 to less than about 5;
wherein the at least one chelating agent (A) comprises a species selected from the group consisting of methyldiphosphonic acid, aminotri(methylenephosphonic acid), 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP), ethylenediaminetetra(methylenephosphonic acid), hexamethylenediaminetetra(methylenephosphonic acid), propylenediaminetetra(methylenephosphonic acid), triethylenetetraminehexa(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), triaminotriethylaminehexa(methylenephosphonic acid), trans-1,2-cyclohexanediaminetetra(methylenephosphonic acid), glycoletherdiaminetetra(methylenephosphonic acid), tetraethylenepentaminehepta(methylenephosphonic acid), phosphonoacetic acid, 2-hydroxy-2-phosphonoacetic acid, 3-phosphonopropionic acid, 4-(3-phosphonopropyl)-2-piperazinecarboxylic acid, salts thereof, and combinations thereof;
wherein the at least one surfactant (C) having an oxyethylene chain in the molecule is selected from the group consisting of ethylene oxide (EO) adducts of alkylamines, EO adducts of monohvdric alcohols, EO adducts of sucrose, EO adducts of sorbitol, EO adducts of sorbitan monolaurate, EO adducts of polyoxypropylene glycol, propylene oxide adducts of polyoxyethylene glycol, EO adducts of alkyl phenols, EO adducts of fatty acids, anionic surfactants prepared by modifying a terminal of an EO adduct of alkyl alcohols, anionic surfactants prepared by modifying a terminal of an EO adduct of alkyl phenols, and any combination thereof; and
selectively removing the copper or the copper alloy relative to the nickel-containing material.
2. The method according to claim 1 , wherein the at least one surfactant (C) having an oxyethylene chain in the molecule is selected from the group consisting of ethylene oxide (EO) adducts of alkylamines, EO adducts of monohydric alcohols, EO adducts of alkyl phenols, EO adducts of fatty acids, and any combination thereof.
3. The method according to claim 1 , wherein the at least one surfactant (C) comprises an ethylene oxide adduct of an alkylamine.
4. The method according to claim 1 , wherein the at least one surfactant (C) comprises EO adducts of octylamines, EO adducts of laurylamines, or a combination thereof.
5. The method according to claim 1 , wherein the at least one solvent comprises a species selected from the group consisting of water, methanol, ethanol, isopropanol, n-propanol, n-hexanol, n-octanol, 2-ethylhexanol, cyclohexanol, ethylene glycol, propylene glycol, 1,4- butanediol, 1,6-hexendiol, tetrahydrofurfuryl alcohol, glycerol, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether propionate, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, diethyl ether, diisopropyl ether, dibutyl ether, tetrahydrofuran, 1,4-dioxane, ethyl lactate methyl 3-methoxypropionate, methyl acetate, ethyl acetate, propyl acetate, γ-butyrolactone, acetone, methyl ethyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, methyl amyl ketone, cyclopentanone, cyclohexanone, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, N,N-dimethylacetamide, N,N-dimethylformamide, and combinations thereof.
6. The method according to claim 1 , wherein the at least one solvent comprises water.