WO2007123235A1 - Cmp用研磨液及び研磨方法 - Google Patents
Cmp用研磨液及び研磨方法 Download PDFInfo
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- WO2007123235A1 WO2007123235A1 PCT/JP2007/058796 JP2007058796W WO2007123235A1 WO 2007123235 A1 WO2007123235 A1 WO 2007123235A1 JP 2007058796 W JP2007058796 W JP 2007058796W WO 2007123235 A1 WO2007123235 A1 WO 2007123235A1
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- Prior art keywords
- polishing
- insulating film
- interlayer insulating
- substrate
- cmp
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/7684—Smoothing; Planarisation
Definitions
- the present invention relates to a CMP polishing liquid and a polishing method.
- CMP chemical mechanical polishing
- a thin film of copper or copper alloy is deposited and embedded on an insulating film in which a groove is formed in advance, and the thin film other than the groove is removed by CMP to form a buried wiring.
- the damascene method is mainly used. This technique is disclosed in, for example, the specification of Japanese Patent No. 1969537.
- a general method of metal CMP for polishing a metal for wiring parts such as copper or copper alloy is to apply a polishing cloth (pad) on a circular polishing surface plate (platen) and use the polishing cloth surface for metal. While dipping in the polishing liquid, the surface of the substrate on which the metal film is formed is pressed against the surface of the polishing cloth, and a predetermined pressure (hereinafter referred to as polishing pressure) is applied to the metal film from the back surface of the polishing cloth. The plate is turned to remove the metal film on the convex portion by relative mechanical friction between the polishing liquid and the convex portion of the metal film.
- polishing pressure a predetermined pressure
- the metal polishing liquid used in CMP is generally composed of oxidized IJ, abrasive grains, and water, and a metal oxide dissolving agent, a protective film forming agent, and the like are further added as necessary. It is considered that the basic mechanism is to first oxidize the metal film surface with an oxidizing agent to form an oxide layer, and then scrape the oxide layer with abrasive grains. Polishing of the oxide layer on the metal film surface of the recess Since the pad is not touched so much and the effect of scraping off by the abrasive grains does not reach, the oxide layer of the convex metal film is removed and the substrate surface is flattened with the progress of CMP. Details of this are disclosed in the journal 'Ob' Electguchi Chemical Society, 138-11 (published in 1991), pages 3460-3464.
- polishing speed by CMP is improved by adding metal oxide solubilizer.
- the oxide layer on the metal film surface in the recess is also etched and the metal film surface is exposed, the metal film surface is further oxidized by the oxidant and this is repeated. Etching of the metal film in the recesses proceeds. For this reason, a phenomenon occurs in which the central portion of the surface of the metal wiring embedded after polishing is depressed like a dish (hereinafter referred to as “dishing”), and the planarization effect is impaired.
- a protective film forming agent is further added to the metal polishing liquid.
- the protective film forming agent forms a protective film on the oxide layer on the surface of the metal film and prevents the oxide layer from being etched. It is desirable that this protective film can be easily scraped off with abrasive grains and that the polishing rate by CMP is not reduced.
- aminoacetic acid and / or amidosulfuric acid is used as a metal oxide solubilizer as a protective film forming agent.
- a method using a polishing slurry for CMP containing zotriazole has been proposed. This technique is described in, for example, Japanese Patent No. 3397501.
- a barrier conductor layer (hereinafter also referred to as a barrier layer) is provided below the metal for wiring part such as copper or copper alloy in order to prevent diffusion of metal into the interlayer insulating film and improve adhesion.
- a layer made of a conductor such as tantalum, tantalum alloy, or tantalum nitride is formed. Therefore, it is necessary to remove the exposed barrier layer by CMP except for the wiring portion in which the wiring portion metal such as copper or copper alloy is embedded.
- the conductors of these barrier layers have higher hardness than copper or copper alloy, even if a polishing material for copper or copper alloy is combined, a sufficient polishing rate cannot be obtained and the surface to be polished is flat. In many cases, the nature is worse. So wiring A polishing method consisting of a two-step process consisting of a first chemical mechanical polishing process for polishing a metal part and a second chemical mechanical polishing process for polishing a barrier layer is being studied.
- the interlayer insulating film is mainly a silicon oxide film, but in recent years, attempts have been made to use a silicon-based material or an organic polymer having a lower dielectric constant than that of the oxide silicon film in order to improve the performance of the LSI (for example, see the publication of JP 2001-049184).
- a second chemical mechanical polishing step is performed using a conventionally known metal film polishing liquid to polish the noble layer and expose the convex interlayer insulating film.
- a conventionally known metal film polishing liquid to polish the noble layer and expose the convex interlayer insulating film.
- Suprem e RN-H Politex manufactured by Rohm & Haas
- the interlayer insulating film portion of the pattern portion having a high density of the wiring metal portion is pressed by the soft polishing pad, the interlayer insulating film portion having a narrow width that is convex from the wiring metal portion due to occurrence of dicing. And the polishing pad come into contact.
- the wiring metal part has a high density
- the pattern part has a low density of the field part and the wiring metal part, and is polished with a greater force compared to the pattern part.
- Tall butter A difference hereinafter referred to as erosion
- erosion occurs between the polishing amount of the interlayer insulating film in the turn portion and the polishing amount of the interlayer insulating film in the field portion. For this reason, the flatness of the surface to be polished is impaired, a surface step is generated on the wiring structure substrate, and the formation of fine wiring is indispensable. As a result, the required high level and flatness cannot be obtained.
- the present invention reduces the pressure applied to the pattern portion having a high density of the wiring metal portion and the polishing pad during the second chemical mechanical polishing step.
- the present invention provides a polishing slurry for CMP that can reduce the size of John.
- the present invention also provides a polishing method in the manufacture of a low-cost semiconductor device or the like that is excellent in miniaturization, thinning, dimensional accuracy, and high reliability. Disclosure of the invention
- the present invention provides: (1) an interlayer insulating film having a concave portion and a convex surface, a barrier layer that covers the interlayer insulating film along a surface, and a barrier layer that covers the barrier layer by filling the concave portion.
- the amount of polishing of the interlayer insulating film in the field portion when the interlayer insulating film portion formed on the substrate has a width of 1000 ⁇ m or more and the amount of polishing of the interlayer insulating film in the field portion is 3 ⁇ 400 A or more and Polishing an interlayer insulating film of a stripe pattern portion having a total width of 1000 ⁇ m or more in which a wiring metal portion having a width of 90 ⁇ m and an interlayer insulating film portion having a width of 10 ⁇ m are alternately arranged on the substrate.
- Difference from amount (B) (B)-(A) The present invention relates to a polishing slurry for CMP characterized by a force of 650 A or less.
- the present invention also relates to (2) the polishing slurry for CMP according to (1), comprising an additive having an action of reducing the difference in polishing amount (B)-(A).
- the present invention also provides (3) Polishing for CMP according to (2), wherein the additive is an organic solvent. Regarding liquids.
- the present invention also relates to (4) the polishing slurry for CMP according to (2), wherein the additive is a water-soluble polymer having a weight average molecular weight of 500 or more.
- the present invention also relates to (5) the polishing slurry for CMP according to (2), wherein the additive contains an organic solvent and a water-soluble polymer having a weight average molecular weight of 500 or more.
- the present invention also provides (6) the polishing slurry for CMP according to (3) or (5), wherein the organic solvent is at least one selected from glycol monoethers, ketones and alcohols. About.
- the present invention also relates to (7) the polishing slurry for CMP according to (3), (5) or (6), wherein the organic solvent is at least one selected from diols.
- the water-soluble polymer is at least one selected from a polysaccharide, a polycarboxylic acid, a polycarboxylic acid ester, a salt of a polycarboxylic acid, and a bull polymer.
- the present invention relates to the polishing slurry for CMP according to 4) or (5).
- the present invention also relates to (9) the polishing slurry for CMP according to any one of (1) to (8), comprising abrasive grains and water.
- the present invention also relates to (10) the polishing slurry for CMP according to (9), wherein the abrasive grains are at least one selected from silica, anolemina, ceria, titania, zirconia and germania.
- the present invention relates to the polishing slurry for CMP according to any one of (1) to (10), which comprises (11) a metal oxide solubilizer.
- the present invention provides: (12) The CM according to (11), wherein the metal oxide solubilizer is at least one selected from an organic acid, an organic acid ester, an ammonium salt of an organic acid, and an inorganic acid.
- the present invention relates to the polishing slurry for CMP according to any one of (1) to (: 12), which comprises (13) a metal anticorrosive.
- the present invention provides: (14) the metal anticorrosive is a compound having a triazole skeleton, a compound having a pyrazole skeleton, a compound having a pyrimidine skeleton, a compound having an imidazole skeleton, a compound having a guanidine skeleton, and Compound having thiazole skeleton Force
- the present invention relates to the polishing slurry for CMP according to the above (13), which is at least one selected.
- the present invention also relates to (15) the polishing slurry for CMP according to any one of (1) to (: 14), which comprises a metal oxidizing agent.
- the metal oxidant is at least one selected from hydrogen peroxide, nitric acid, periodic acid power lithium, hypochlorous acid, and ozone water.
- the present invention provides (17) an interlayer insulating film having a concave portion and a convex surface, a barrier layer that covers the interlayer insulating film along the surface, and a barrier layer that covers the barrier layer by filling the concave portion.
- the barrier layer of the substrate exposed in the first chemical mechanical polishing step is polished with the CMP polishing liquid according to any one of claims 1 to 16 to form an interlayer insulating film on the convex portion. And a second chemical mechanical polishing step for exposing.
- the present invention also relates to (18) the polishing method according to (17), wherein the interlayer insulating film is a silicon-based film or an organic polymer film.
- the present invention provides (19) the above (17) or (18), wherein the conductive substance is at least one selected from copper, a copper alloy, a copper oxide and a copper alloy oxide. It relates to the polishing method.
- the barrier layer includes at least one selected from tantalum, a tantalum compound, titanium, a titanium compound, tungsten, a tungsten compound, ruthenium, and a ruthenium compound.
- the polishing method according to any one of 19).
- the present invention provides (21) an interlayer insulating film having a concave portion and a convex surface, a barrier layer that covers the interlayer insulating film along the surface, and a barrier layer that covers the barrier layer by filling the concave portion.
- the erosion is reduced, that is, the pattern portion having a low density of the wiring metal portion, the pattern portion having a high density of the wiring metal portion, and the interlayer insulating film in the field portion are similarly formed.
- polishing the surface level difference of the wiring structure substrate is reduced, and high flatness can be obtained.
- the polishing method for performing chemical mechanical polishing using the CMP polishing liquid of the present invention is highly reliable semiconductor devices with high miniaturization, thinning, dimensional accuracy, and electrical characteristics, which are highly productive. And suitable for manufacturing other electronic devices.
- the polishing slurry for CMP of the present invention comprises an interlayer insulating film having a surface formed of recesses and protrusions, a barrier layer covering the interlayer insulating film along the surface, and filling the recesses with a barrier layer.
- Ken Migakuryou field portion of the interlayer insulating film when the interlayer insulating film portion formed on the substrate is 1000 beta polishing amount force of the interlayer insulating film of a field portion having a width or more m 00 A or (A) and , an interlayer insulating the wiring metal portion and the width 10 mu interlayer insulation Enmaku portion and a stripe-shaped pattern of the above total width 1000 mu m to alternating of m of width 90 beta m formed on the substrate of the Difference between polishing amount of film (B) (B)-(A) A polishing liquid for CMP characterized by a force of 650 A or less.
- the CMP polishing liquid of the present invention contains an additive (hereinafter, referred to as an additive) having an action of reducing the difference in the polishing amount (B)-(A). It is possible to reduce the pressure applied to the interlayer insulating film part of the pattern part and the polishing pad having a high density and to reduce the erosion.
- an additive hereinafter, referred to as an additive
- Examples of the additive include an organic solvent or an organic solvent preferably containing at least one selected from water-soluble polymers having a weight average molecular weight of 500 or more and water-soluble polymers having a weight average molecular weight of 500 or more. More preferably, both are included.
- Examples of the organic solvent used as the additive include glycol glycols such as ethylene glycol, prolenic glycolol, diethylene glycolol, dipropylene glycolol, triethyleneglycolanol, and tripropyleneglycolanol; ethylene glycololmonomethylol Etherol, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, triethylene glycol monomethyl ether, tripropylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monoethyl ether Chill ether, dipropylene glycol monoethyl ether, triethylene glycol monoethyl ether -Ether, tripropylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monophenyl ether, propylene glycol monopropylene ether, ethylene
- glycol monoethers, ketones Preferred are alcohols such as ethylene glycol monomethyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol mononomonophenolateol, Propylene glycol monopropinoleateol, ethylene glycol monobutinoleateol, propyleneglycol monobutinoleateol, 3-methylolone 1-butanol, 2_methyl _ 1-butanol, 2 _ethyl _ 1, 3-hexanediol, 2_butyl_2_ethyl-1,3_propanediol, 2,2-dimethyl_1,3_propandiol, 2-hydroxymethyl_2_methyl_1,3_propanediol, 3—Menolecapto 1, 2 _Propandi 3_ (0_methoxyphenoxy
- 2-ethyl-1,3-hexanediol 2-butyl-2-ethyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-hydroxymethyl-2-methyl-1- , 3-propanediol, 3-mercapto 1,2-propanediol, 3- (0-methoxyphenoxy) -1, 2,2-propanediol, 1,3-propanediol, 2,5 dimethyl-2 Diols such as 1,2,6 hexanediol, 1,6 hexanediol, 2-methylolene 2,4 pentanediol, 2,2,4 trimethyl-1,3 pentanediol, 3,6-dithia 1,8-octanediol Is particularly preferred.
- the blending amount of the organic solvent in the CMP polishing slurry of the present invention is preferably f. 0.:! To 80 g, more preferably f. Preferably, it is 0.5 to 20 g, and if the amount of the organic solvent is less than 0.1 lg, the wettability of the CMP polishing liquid to the substrate may be low, and if it exceeds 80 g, This is preferable in the manufacturing process because the risk of ignition increases.
- the weight average molecular weight of the water-soluble polymer used as the additive is preferably 500 or more, more preferably 1500 or more, and particularly preferably 5000 or more.
- the upper limit of the weight average molecular weight of the water-soluble polymer is not particularly limited, but it is 5 million from the viewpoint of solubility. The following is preferred. When the weight average molecular weight of the water-soluble polymer is less than 500, there is a tendency that a high level and a polishing rate are not exhibited.
- the weight average molecular weight of the water-soluble polymer can be measured by gel permeation chromatography using a standard polystyrene calibration curve.
- the water-soluble polymer having a weight average molecular weight of 500 or more to be used as the additive is not particularly limited.
- polysaccharides such as alginic acid, pectinic acid, carboxymethylcellulose, agar, vigorous dolan and punoreran; Polyaspartic acid, polygnoretamic acid, polylysine, polymalic acid, polymethacrylic acid, polymethacrylic acid ammonium salt, polymethacrylic acid sodium salt, polyamic acid, polymaleic acid, polyitaconic acid, polyfumanoleic acid, poly ( ⁇ -styrene carboxylic acid) , Polyacrylic acid, polyacrylolamide, aminopolyacrylamide, polyacrylic acid ammonium salt, polyacrylic acid sodium salt, polyamic acid, polyamic acid ammonium salt, polyamic acid sodium salt and polydaroxylic acid acid, Salts of helical Bonn esters and polycarboxylic acids; poly Bulle alcohols, such
- the substrate to which the CMP polishing liquid of the present invention is applied is a silicon substrate for semiconductor integrated circuits or the like, contamination with alkali metal, alkaline earth metal, halide, etc. is not desirable, so Polymers that do not contain alkali metals, alkaline earth metals, and halides are suitable.
- Pectinic acid, agar, polymalic acid, polymethacrylic acid, polyacrylic acid, polyacrylic acid ammonium salt, polyacryloleamide, Polybulol alcohol and polyvinino repyrrolidone, their esters and their ammonium salts are particularly preferred. However, this is not the case when the substrate is a glass substrate or the like.
- the combined amount of the water-soluble polymer having a weight average molecular weight of 500 or more in the CMP polishing liquid of the present invention is preferably 10 g or less, more preferably 0.005 to 5 g, relative to 100 g of the CMP polishing liquid. Particularly preferred is 0.01 to 2 g. When the amount of the water-soluble polymer exceeds 10 g, the polishing rate tends to decrease.
- the polishing slurry for CMP of the present invention may contain abrasive grains and water.
- abrasive grains examples thereof include inorganic abrasive particles such as silica, anolemina, zirconia, ceria, titania, germania and silicon carbide, and organic abrasive particles such as polystyrene, polyacryl and polychlorinated butyl.
- silica or alumina is particularly preferable, where silica, anolemina, zirconia, ceria, titania and germania are preferred.
- colloidal silica or colloidal alumina with an average particle size of 70 nm or less with few occurrences of polishing scratches (scratches) generated by CMP, which has good dispersion stability in CMP polishing liquid. More preferably, colloidal silica or colloidal alumina having a mean particle size of S40 nm or less is more preferable. These abrasive grains can be used alone or in combination of two or more.
- the abrasive grains are preferably aggregated particles in which primary particles are aggregated, and it is more preferable that the average particle is less than 1.2 particles. It is particularly preferred that the particles are aggregated particles.
- the abrasive grains preferably have a standard deviation of the average particle size distribution of 10 nm or less, and more preferably 5 nm or less.
- Colloidal silica can be produced by a known production method by hydrolysis of silicon alkoxide or ion exchange of sodium silicate. From the viewpoint of particle size controllability and alkali metal impurities, tetramethoxysilane, tetraethoxysilane, etc. A method of hydrolyzing silicon alkoxide is most utilized. Colloidal alumina can be produced by a known production method by hydrolysis of aluminum nitrate.
- the blending amount of the abrasive grains in the CMP polishing liquid of the present invention is preferably about 0.01 to 50 g, more preferably about 0.030 to 30 g, and particularly preferably about ⁇ g to CMP polishing liquid lOOg. 0. 05-: 15g.
- the polishing rate tends to be low.
- the polishing slurry for CMP of the present invention may contain a metal oxide dissolving agent.
- the metal oxide solubilizer is not particularly limited, and examples thereof include organic acids, organic acid esters, ammonium salts of organic acids, inorganic acids, and ammonium salts of inorganic acids.
- formic acid, malonic acid, malic acid, tartaric acid, citrate, salicylic acid, adipic acid, and phthalic acid are preferred in that the etching rate can be effectively suppressed while maintaining a practical CMP rate.
- Suitable are malic acid or salicylic acid.
- sulfuric acid is preferable in view of the high CMP rate. These can be used alone or in combination of two or more.
- the compounding amount of the metal oxide solubilizer in the CMP polishing liquid of the present invention is preferably ⁇ f 0.001 to 20 g, more preferably ⁇ MA 0.002 to 1 OOg of the CMP polishing liquid. ⁇ : 10g, special preference ⁇ is 0.005-5g.
- the blending amount of the metal oxide solubilizer is less than 0.0OOlg, the polishing rate tends to be low, and when it exceeds 20 g, it is difficult to suppress etching and the polished surface tends to be rough.
- the polishing slurry for CMP of the present invention may contain a metal anticorrosive.
- the metal anticorrosive is not particularly limited, and examples thereof include a compound having a triazole skeleton, a compound having a pyrazole skeleton, a compound having a pyrimidine skeleton, a compound having an imidazole skeleton, a compound having a guanidine skeleton, a compound having a thiazole skeleton, etc.
- a metal anticorrosive is not particularly limited, and examples thereof include a compound having a triazole skeleton, a compound having a pyrazole skeleton, a compound having a pyrimidine skeleton, a compound having an imidazole skeleton, a compound having a guanidine skeleton, a compound having a thiazole skeleton, etc.
- Examples of the compound having a triazole skeleton include 1, 2, 3 triazole, 1, 2, 4 triazole, 3 amino-1H—1, 2, 4 triazole, benzotriazole, 1-hydroxybenzotriazole, 1-dihydroxypropyl.
- Benzotriazole 2, 3 Dicanole Boxoxypropyl Benzotriazole, 4-Hydroxybenzotriazole, 4 Carboxyl (1H—) benzotriazole, 4 Carboxyl (1 1H—) Benzotriazole Methololenore Estenole, 4 Carboxyl (1 1H —) Benzotriazole butyl ester, 4 One strength Norevoxyl (1H—) benzotriazole octyl ester, 5-hexyl benzotriazole, [1, 2, 3-Benzotriazolyl 1 methyl] [1, 2, 4-triazolyl 1-methylol] [2-ethylhexyl] amamine, trilt And riazole, naphthotriazole, bis [(1-benzotriazolyl) methyl] phosphonic acid, and the like.
- Examples of the compound having a pyrazole skeleton include 3,5-dimethylpyrazole, 3_methyl_5_pyrazolone, 3-amino_5-methylpyrazole, 3-amino_5-hydroxypyrazole, 3-amino-1-5-methyl. And pyrazole.
- Examples of the compound having a pyrimidine skeleton include pyrimidine, 1,2,4 triazolo [1,5a] pyrimidine, 1,3,4,6,7,8 hexahydro 2H-pyrimido [1,2a] pyrimidine 1,3 dipheninore-pyrimidine-2,4,6 trione, 1,4,5,6-tetrahydropyrimidine, 2,4,5,6-tetraaminopyrimidine snolevate, 2, 4, 5-trihydroxypyrimidine, 2, 4, 6-triaminopyrimidine, 2, 4, 6-triclo-mouth pyrimidine, 2, 4, 6-trimethoxypyrimidine, 2, 4, 6-tripheninorepyrimidine, 2, 4-Diamino-6-hydroxylpyrimidine, 2,4-Diaminopyrimidine, 2-Acetamidopyrimidine, 2-Aminopyrimidine, 2_Methyl _ 5, 7_Diphenyl _ (1, 2, 4) Triazolo (1 , 5 _a) pyrimidine
- Examples of the compound having an imidazole skeleton include imidazole, 2_methylimidazole, 2-ethylimidazole, 2_isopropylimidazole, 2_propylimidazole, 2-butylimidazole, 4-methylimidazole, and 2,4_dimethylimidazole. , 2-ethyl 4-methylimidazole, 2-aminoimidazole, mercaptobenzoimidazole and the like.
- Examples of the compound having a guanidine skeleton include 1,3-diphenyldanidine and 1-methyl-3-bistroguanidine.
- Examples of the compound having a thiazole skeleton include 2-aminothiazole, 4,5-dimethylthiazole, 2-amino-2-thiazoline, 2,4-dimethylthiazole, 2-amino-4-methylthiazole and the like.
- benzotriazole is particularly preferable, since a compound having a triazole skeleton is preferable.
- These metal anticorrosives can be used alone or in combination of two or more.
- the compounding amount of the metal anticorrosive in the CMP polishing liquid of the present invention is preferably 10 g or less, more preferably 0.001 to 5 g, particularly preferably 0.002 to 2 g with respect to 100 g of the CMP polishing liquid. It is. When the compounding amount of the metal anticorrosive exceeds 10 g, the polishing rate tends to be low.
- the CMP polishing liquid of the present invention may contain a metal oxidizing agent.
- the metal oxidizing agent is not particularly limited, and examples thereof include hydrogen peroxide, nitric acid, potassium periodate, hypochlorous acid, and ozone water. Among these, hydrogen peroxide is particularly preferable. These may be used alone or in combination of two or more.
- the substrate to which the CMP polishing liquid of the present invention is applied is a silicon substrate including an integrated circuit element, contamination with alkali metal, alkaline earth metal, halide, etc. is desirable. Therefore, an oxidizing agent that does not contain non-volatile components is desirable. Ozone water is the most suitable because the composition of ozone water changes drastically over time. Further, when the substrate to be applied is a glass substrate that does not include a semiconductor element, an oxidant that includes a nonvolatile component may be used.
- the compounding amount of the metal oxidizing agent in the CMP polishing slurry of the present invention is preferably from f to 0.01 to 50 g, more preferably to ⁇ or 0.02 to 20 g, particularly for 100 g of the CMP polishing solution.
- ⁇ is preferably f. 0.0 5 to 10 g.
- the second chemical mechanical polishing step is performed, whereby the interlayer insulation formed on the substrate is formed.
- the polishing amount of the interlayer insulating film in the field portion having a width of 1000 ⁇ m or more is 400 A or more
- the field portion refers to a portion where the wiring metal portion does not exist, that is, a portion where the width is not less than ⁇ and only the interlayer insulating film portion exists.
- an interlayer insulating film having a surface composed of a concave portion and a convex portion, a barrier layer covering the interlayer insulating film along the surface, and filling the concave portion and covering the barrier layer
- a polishing platen is used while supplying a polishing liquid between the polishing pad and the substrate in a state where the substrate having the surface to be polished is pressed onto the polishing pad of the polishing platen.
- a method of polishing the surface to be polished by moving the substrate relative to the substrate is mentioned.
- the conductive substance include conductive substances mainly composed of metals such as copper, copper alloys, copper oxides, copper alloy oxides, tandasten, tungsten alloys, silver, and gold.
- conductive materials containing copper as a main component such as copper, copper alloy, copper oxide, and copper alloy oxide, are preferable.
- the conductive material layer a film in which the above material is formed by a known sputtering method or plating method can be used.
- the barrier layer is formed in order to prevent the conductive material from diffusing into the interlayer insulating film and to improve the adhesion between the interlayer insulating film and the conductive material.
- the composition of the barrier layer is selected from tungsten compounds such as tungsten, tungsten nitride, and tungsten alloys, titanium compounds such as titanium, titanium nitride, and titanium alloys, tantalum compounds such as tantalum, tantalum nitride, and tantalum alloys, ruthenium, and ruthenium compounds.
- the barrier layer may be a single layer structure composed of one kind of these or a laminated structure composed of two or more kinds.
- Examples of the interlayer insulating film include a silicon-based film and an organic polymer film.
- Silicon-based coatings include silica-based coatings such as silicon dioxide, fluorosilicate glass, trimethylsilane and dimethyoxydimethylsilane, starting from organosilicate glass, silicon oxynitride, and hydrogenated silsesquioxane, Examples include silicon carbide and silicon nitride.
- Examples of the organic polymer film include a wholly aromatic low dielectric constant interlayer insulating film. Of these, organosilicate glass is preferable. These films are formed by a CVD method, a spin coating method, a dip coating method, or a spray method.
- Specific examples of the interlayer insulating film include an interlayer insulating film in an LSI manufacturing process, particularly a multilayer wiring forming process.
- the polishing pad is connected to a holder that can hold the substrate to be polished, a motor that can change the number of rotations, and the like.
- a general polishing apparatus having a polishing surface plate can be used.
- the polishing pad is a polyurethane wet foam type polishing pad, and a soft type polishing pad with a Shore hardness (D scale) of 40 or less is preferred.
- Commercially available products are Supreme RN—H Politex (Roh m & Haas), which is a black suede polyurethane wet foam type pad.
- the polishing conditions are not limited, but the rotation speed of the surface plate is preferably low rotation of 200 mIRT 1 or less so that the substrate does not jump out.
- the pressure applied to the polishing cloth of the semiconductor substrate having the surface to be polished is 1 to:! OOkPa in order to satisfy the uniformity in the surface to be polished and the flatness of the pattern at a preferable polishing rate. Is more preferably 5 to 50 kPa.
- the CMP polishing liquid of the present invention is continuously supplied to the polishing pad by a pump or the like.
- the supply amount is not limited, but it is preferable that the surface of the polishing pad is always covered with the polishing liquid.
- the substrate after polishing is thoroughly washed in running water, and then water droplets adhering to the substrate are removed by using spin drying or the like, and then dried.
- polishing pad In order to perform chemical mechanical polishing with the same surface state of the polishing pad, it is preferable to perform a conditioning step of the polishing pad before polishing.
- the polishing pad is conditioned by spraying a liquid containing at least water onto the polishing pad. Subsequently, it is preferable to carry out the polishing method of the present invention and further add a substrate cleaning step.
- the CMP polishing liquid of the present invention is applied between the pad and the substrate while the substrate is pressed onto a polyurethane wet foam type polishing pad.
- the exposed noble layer in the first chemical mechanical polishing step is polished to expose the convex interlayer insulating film.
- the amount of polishing of the interlayer insulating film in the field portion when the interlayer insulating film portion formed on the substrate has a width of 1000 ⁇ m or more and the amount of polishing of the interlayer insulating film in the field portion is 3 ⁇ 400 A or more, Polishing amount of interlayer insulating film on striped pattern part with total width of 1000 ⁇ m or more, in which wiring metal part with width of 90 ⁇ m and interlayer insulating film part with width of 10 ⁇ m are alternately arranged on the substrate Difference from (B) (B) — (A) is 650 A or less, reducing erosion
- the polishing method of the present invention can be applied to, for example, formation of a wiring layer in a semiconductor device.
- an interlayer insulating film such as silicon dioxide is laminated on a silicon substrate.
- a concave portion substrate exposed portion
- a barrier layer such as tantalum that covers the inter-layer insulating film is formed by vapor deposition or CVD along the unevenness of the surface.
- a conductive material layer such as copper covering the barrier layer is formed by vapor deposition, plating, CVD or the like so as to fill the recess.
- the thickness of the interlayer insulating film formed on the substrate is about 0.0:! To 2. Ozm, the thickness of the barrier layer is about 1 to 100 nm, and the thickness of the conductive material layer is 0.0:! 2. 5 zm is preferable.
- the conductive material layer on the surface of the substrate is subjected to CMP using, for example, the CMP polishing liquid for the conductive material layer having a sufficiently high polishing rate ratio of the conductive material layer Z barrier layer. More polishing (first chemical mechanical polishing step).
- first chemical mechanical polishing step As a result, the desired barrier pattern is obtained in which the convex barrier layer on the substrate is exposed on the surface and the conductive material layer is left in the concave.
- a part of the barrier layer of the convex portion may be polished simultaneously with the conductive material layer.
- the pattern surface obtained by the first chemical mechanical polishing step is polished using the CMP polishing liquid of the present invention as a surface to be polished for the second chemical mechanical polishing step.
- the substrate is pressed onto a polyurethane wet foam type polishing pad, and the polishing constant is supplied while supplying the CMP polishing liquid of the present invention between the pad and the substrate.
- the barrier layer exposed by the first chemical mechanical polishing step is polished by relatively moving the plate and the substrate. Since the CMP polishing liquid of the present invention can polish the conductive material, the barrier layer and the interlayer insulating film, in the second polishing step, at least the exposed barrier layer and the conductive material layer in the recess are polished. .
- overpolishing for example, when the time until a desired pattern is obtained in the second chemical mechanical polishing step is 100 seconds, this 100 Polishing for 50 seconds in addition to polishing for 2 seconds is called over polishing 50%
- it may be polished to a depth including a part of the convex interlayer insulating film.
- An interlayer insulating film and a second-layer metal wiring are further formed on the metal wiring thus formed, and an interlayer insulating film is formed again between and on the wiring, and then polished.
- a smooth surface is formed over the entire surface of the semiconductor substrate.
- the polishing liquid of the present invention can be used not only for polishing a metal film formed on a semiconductor substrate as described above but also for polishing a substrate such as a magnetic head.
- Polish a pattern substrate with copper wiring (ATDF 854CMP pattern: 5000 A thick interlayer insulating film made of silicon dioxide) with a known method to polish the protruding copper layer on the surface to be polished. Exposed. This substrate was used for the following polishing.
- the barrier layer of the pattern substrate was a tantalum film with a thickness of 250A.
- Polishing machine Single-side CMP polishing machine (MIRRA, Applied Materials)
- Polishing pad Suede polyurethane wet foam pad (Rohm & Haas, SupremeRN—H Politex)
- Polishing pressure 2psi (about 14kPa)
- Polishing fluid supply 200ml / min ⁇ Substrate polishing process>
- the pattern substrate was subjected to chemical mechanical polishing with each of the CMP polishing liquids prepared above for 70 seconds under the above polishing conditions. This corresponds to the second polishing step. In about 20 seconds, the convex interlayer insulating film was exposed on the surface to be polished, and for the remaining 50 seconds, the exposed interlayer insulating film was polished on the convex part. .
- a sponge brush manufactured by polybula alcohol resin was pressed against the surface to be polished of the patterned substrate polished above, and the substrate and sponge brush were rotated while supplying distilled water to the substrate, and washed for 90 seconds. Next, the sponge brush was removed, and distilled water was supplied to the polished surface of the substrate for 60 seconds. Finally, the substrate was dried by spinning off the distilled water by rotating the substrate at high speed.
- the average particle size is 60 nm.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800148929A CN101432854B (zh) | 2006-04-24 | 2007-04-24 | Cmp用研磨液及研磨方法 |
JP2008512184A JPWO2007123235A1 (ja) | 2006-04-24 | 2007-04-24 | Cmp用研磨液及び研磨方法 |
EP07742231A EP2020680A4 (en) | 2006-04-24 | 2007-04-24 | POLISHING LIQUID FOR CMP AND POLISHING METHOD |
US12/298,342 US20090094901A1 (en) | 2006-04-24 | 2007-04-24 | CMP Polishing Liquid and Polishing Method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-119086 | 2006-04-24 | ||
JP2006119086 | 2006-04-24 |
Publications (1)
Publication Number | Publication Date |
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WO2007123235A1 true WO2007123235A1 (ja) | 2007-11-01 |
Family
ID=38625132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/058796 WO2007123235A1 (ja) | 2006-04-24 | 2007-04-24 | Cmp用研磨液及び研磨方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090094901A1 (ja) |
EP (1) | EP2020680A4 (ja) |
JP (1) | JPWO2007123235A1 (ja) |
KR (1) | KR20080108574A (ja) |
CN (1) | CN101432854B (ja) |
TW (1) | TWI350564B (ja) |
WO (1) | WO2007123235A1 (ja) |
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US20100216309A1 (en) * | 2007-10-23 | 2010-08-26 | Hitachi Chemical Company, Ltd. | Cmp polishing liquid and method for polishing substrate using the same |
JP2011254067A (ja) * | 2010-05-07 | 2011-12-15 | Hitachi Chem Co Ltd | Cmp用研磨液及びこれを用いた研磨方法 |
JP2012512757A (ja) * | 2008-12-20 | 2012-06-07 | キャボット マイクロエレクトロニクス コーポレイション | ワイヤーソー切断の間の乾燥性を向上させるための組成物 |
CN102768954A (zh) * | 2008-04-16 | 2012-11-07 | 日立化成工业株式会社 | Cmp用研磨液以及研磨方法 |
US9022834B2 (en) | 2008-12-11 | 2015-05-05 | Hitachi Chemical Company, Ltd. | Polishing solution for CMP and polishing method using the polishing solution |
JP2018164075A (ja) * | 2017-01-31 | 2018-10-18 | ローム アンド ハース エレクトロニック マテリアルズ シーエムピー ホウルディングス インコーポレイテッド | タングステンのための化学機械研磨法 |
JP2021503684A (ja) * | 2017-11-20 | 2021-02-12 | シーエムシー マテリアルズ,インコーポレイティド | 減少した表面スクラッチを示すメモリハードディスクを研磨するための組成物および方法 |
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US10181408B2 (en) * | 2017-01-31 | 2019-01-15 | Rohm And Haas Electronic Materials Cmp Holdings, Inc. | Chemical mechanical polishing method for tungsten using polyglycols and polyglycol derivatives |
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Cited By (10)
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US20100216309A1 (en) * | 2007-10-23 | 2010-08-26 | Hitachi Chemical Company, Ltd. | Cmp polishing liquid and method for polishing substrate using the same |
CN102768954A (zh) * | 2008-04-16 | 2012-11-07 | 日立化成工业株式会社 | Cmp用研磨液以及研磨方法 |
CN102766409A (zh) * | 2008-04-16 | 2012-11-07 | 日立化成工业株式会社 | Cmp用研磨液以及研磨方法 |
US9022834B2 (en) | 2008-12-11 | 2015-05-05 | Hitachi Chemical Company, Ltd. | Polishing solution for CMP and polishing method using the polishing solution |
JP2012512757A (ja) * | 2008-12-20 | 2012-06-07 | キャボット マイクロエレクトロニクス コーポレイション | ワイヤーソー切断の間の乾燥性を向上させるための組成物 |
JP2011254067A (ja) * | 2010-05-07 | 2011-12-15 | Hitachi Chem Co Ltd | Cmp用研磨液及びこれを用いた研磨方法 |
JP2018164075A (ja) * | 2017-01-31 | 2018-10-18 | ローム アンド ハース エレクトロニック マテリアルズ シーエムピー ホウルディングス インコーポレイテッド | タングステンのための化学機械研磨法 |
JP7144146B2 (ja) | 2017-01-31 | 2022-09-29 | ローム アンド ハース エレクトロニック マテリアルズ シーエムピー ホウルディングス インコーポレイテッド | タングステンのための化学機械研磨法 |
JP2021503684A (ja) * | 2017-11-20 | 2021-02-12 | シーエムシー マテリアルズ,インコーポレイティド | 減少した表面スクラッチを示すメモリハードディスクを研磨するための組成物および方法 |
JP7163387B2 (ja) | 2017-11-20 | 2022-10-31 | シーエムシー マテリアルズ,インコーポレイティド | 減少した表面スクラッチを示すメモリハードディスクを研磨するための組成物および方法 |
Also Published As
Publication number | Publication date |
---|---|
EP2020680A1 (en) | 2009-02-04 |
EP2020680A4 (en) | 2011-09-21 |
CN101432854A (zh) | 2009-05-13 |
KR20080108574A (ko) | 2008-12-15 |
TWI350564B (en) | 2011-10-11 |
JPWO2007123235A1 (ja) | 2009-09-10 |
TW200802580A (en) | 2008-01-01 |
US20090094901A1 (en) | 2009-04-16 |
CN101432854B (zh) | 2011-04-06 |
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