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US 12,516,421 B2Granted
Barrier chemical mechanical planarization slurries for cobalt films
AssigneeVersum Materials US, LLC
InventorsXiaobo Shi, James A. Schlueter
Life of this patent
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Abstract
Cobalt barrier Chemical Mechanical Planarization (CMP) compositions, systems and methods are provided for the removal of cobalt or a cobalt alloy from the surface of a semiconductor device during its manufacture. The compositions use suitable chemical additives selected from the group consisting of an aliphatic organic carboxylic acid, an aromatic organic carboxylic acid, and combinations thereof; abrasives; an oxidizing agent; and an corrosion inhibitor; to provide tunable cobalt film removal rates, tunable selectivity between cobalt and dielectric or other barrier films, and maintain very low static etching rates on cobalt film.
Claims18
A chemical mechanical planarization composition comprising:
- water;
- an oxidizing agent selected from the group consisting of hydrogen peroxide, periodic acid, potassium iodate, potassium permanganate, ammonium persulfate, ammonium molybdate, ferric nitrate, nitric acid, potassium nitrate, ammonia, and mixtures thereof;
- an abrasive comprising nano-sized particles selected from the group consisting of silica, alumina, ceria, germania, titania, zirconia, alumina-doped silica, and mixtures thereof;
- an aromatic organic carboxylic acid selected from the group consisting of toluene-2,α-dicarboxylic acid, ammonium benzoate, n-amyl benzoate, vinyl benzoate, methyl benzoate, ethyl benzoate, benzoic acid anhydride, methyl phthalate, methyl isophthalate, methyl terephthalate, 1,2,4,5-benzenetetracarboxylic acid, 1,2,3-benzenetricarboxylic acid, phenylglycine, N-anilinoacetic acid, sodium o-hydroxybenzoate (sodium salicylate), potassium o-hydroxybenzoate, anthranilic acid, benzylmercapturic acid, aminotoluic acid, quinaldic acid, salts thereof, and mixtures thereof;
- a corrosion inhibitor selected from the group consisting of 1,2,3-triazole, 1,2,4-triazole, 3-amino-1,2,4-triazole, 4-amino-4H-1,2,4-triazole, 5 amino triazole, benzimidazole, benzothiazoles such as 2,1,3-benzothiadiazole, triazinethiol, triazinedithiol, and triazinetrithiol, pyrazoles, imidazoles, isocyanurate such as 1,3,5-Tris(2-hydroxyethyl), and mixtures thereof;
- a surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant, an ampholytic surfactant, and mixtures thereof;
- and, optionally,
- a pH adjusting agent,
- wherein the polishing composition has a pH of from 9 to 11.
6 more elements
A method of a selective chemical mechanical polishing comprising:
- a) providing a semiconductor substrate having a surface containing a first material and at least one second material;
- wherein the first material is Co and the second material is at least one selected from the group consisting of dielectric film selected from the group consisting of TEOS film, SiNx film with x ranging 1.0<x<1.5, and combinations thereof, low-k and ultra-low k film, and barrier film selected from the group consisting of Ta film, TaN film, Ti film, TiN film and combinations thereof;
- b) providing a polishing pad;
- c) providing a chemical mechanical polishing composition comprising:
- water;
- an oxidizing agent selected from the group consisting of hydrogen peroxide, periodic acid, potassium iodate, potassium permanganate, ammonium persulfate, ammonium molybdate, ferric nitrate, nitric acid, potassium nitrate, ammonia, and mixtures thereof;
- an abrasive comprising nano-sized particles selected from the group consisting of silica, alumina, ceria, germania, titania, zirconia, alumina-doped silica, and mixtures thereof;
- an aromatic organic carboxylic acid selected from the group consisting of toluene-2,α-dicarboxylic acid, ammonium benzoate, n-amyl benzoate, vinyl benzoate, methyl benzoate, ethyl benzoate, benzoic acid anhydride, methyl phthalate, methyl isophthalate, methyl terephthalate, 1,2,4,5-benzenetetracarboxylic acid, 1,2,3-benzenetricarboxylic acid, phenylglycine, N-anilinoacetic acid, sodium o-hydroxybenzoate (sodium salicylate), potassium o-hydroxybenzoate, anthranilic acid, benzylmercapturic acid, aminotoluic acid, quinaldic acid, salts thereof, and mixtures thereof;
- a corrosion inhibitor selected from the group consisting of 1,2,3-triazole, 1,2,4-triazole, 3-amino-1,2,4-triazole, 4-amino-4H-1,2,4-triazole, 5 amino triazole, benzimidazole, benzothiazoles such as 2,1,3-benzothiadiazole, triazinethiol, triazinedithiol, and triazinetrithiol, pyrazoles, imidazoles, isocyanurate such as 1,3,5-Tris(2-hydroxyethyl), and mixtures thereof;
- a surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant, an ampholytic surfactant, and mixtures thereof;
- and, optionally,
- a pH adjusting agent,
- wherein the polishing composition has a pH of from 9 to 11;
- and
- d) polishing the surface of the semiconductor substrate to selectively remove the first material, wherein Co is a metal inter-connection material, at least a portion of the surface is in contact with both the polishing pad and the chemical mechanical polishing composition, and ratio of removal rate of the first material to removal rate of the second material is greater than 1.
12 more elements
A system for a selective chemical mechanical polishing comprising:
- a) providing a semiconductor substrate having a surface containing a first material and at least one second material;
- wherein the first material is Co and the second material is at least one selected from the group consisting of dielectric film selected from the group consisting of TEOS film, SiNx film with x ranging 1.0<x<1.5, and combinations thereof, low-k and ultra-low k film, and barrier film selected from the group consisting of Ta film, TaN film, Ti film, TiN film and combinations thereof;
- b) providing a polishing pad;
- c) providing a chemical mechanical polishing composition comprising:
- water;
- an oxidizing agent selected from the group consisting of hydrogen peroxide, periodic acid, potassium iodate, potassium permanganate, ammonium persulfate, ammonium molybdate, ferric nitrate, nitric acid, potassium nitrate, ammonia, and mixtures thereof;
- an abrasive comprising nano-sized particles selected from the group consisting of silica, alumina, ceria, germania, titania, zirconia, alumina-doped silica, and mixtures thereof;
- an aromatic organic carboxylic acid selected from the group consisting of toluene-2,α-dicarboxylic acid, ammonium benzoate, n-amyl benzoate, vinyl benzoate, methyl benzoate, ethyl benzoate, benzoic acid anhydride, methyl phthalate, methyl isophthalate, methyl terephthalate, 1,2,4,5-benzenetetracarboxylic acid, 1,2,3-benzenetricarboxylic acid, phenylglycine, N-anilinoacetic acid, sodium o-hydroxybenzoate (sodium salicylate), potassium o-hydroxybenzoate, anthranilic acid, benzylmercapturic acid, aminotoluic acid, quinaldic acid, salts thereof, and mixtures thereof;
- a corrosion inhibitor selected from the group consisting of 1,2,3-triazole, 1,2,4-triazole, 3-amino-1,2,4-triazole, 4-amino-4H-1,2,4-triazole, 5 amino triazole, benzimidazole, benzothiazoles such as 2,1,3-benzothiadiazole, triazinethiol, triazinedithiol, and triazinetrithiol, pyrazoles, imidazoles, isocyanurate such as 1,3,5-Tris(2-hydroxyethyl), and mixtures thereof;
- a surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant, an ampholytic surfactant, and mixtures thereof;
- and, optionally,
- a pH adjusting agent,
- wherein the polishing composition has a pH of from 9 to 11;
- and
- d) polishing the surface of the semiconductor substrate to selectively remove the first material, wherein Co is a metal inter-connection material, at least a portion of the surface is in contact with both the polishing pad and the chemical mechanical polishing composition, and ratio of removal rate of the first material to removal rate of the second material is greater than 1.
12 more elements
Dependencies are inferred from the claim text.