WO2012133561A1 - 研磨用組成物および研磨方法 - Google Patents
研磨用組成物および研磨方法 Download PDFInfo
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- WO2012133561A1 WO2012133561A1 PCT/JP2012/058195 JP2012058195W WO2012133561A1 WO 2012133561 A1 WO2012133561 A1 WO 2012133561A1 JP 2012058195 W JP2012058195 W JP 2012058195W WO 2012133561 A1 WO2012133561 A1 WO 2012133561A1
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- Prior art keywords
- polishing composition
- group
- polishing
- acid
- hydrogen peroxide
- Prior art date
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Classifications
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- 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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- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
Definitions
- the present invention relates to a polishing composition used for polishing a substrate surface containing metal (hereinafter referred to as “polishing object”) in a semiconductor integrated circuit (hereinafter referred to as “LSI”), for example.
- polishing object a substrate surface containing metal
- LSI semiconductor integrated circuit
- CMP chemical mechanical polishing
- contact plugs In the formation of contact plugs, tungsten is used as the embedding material and its interdiffusion barrier material. In forming the contact plug, a manufacturing method is used in which an extra portion other than the contact plug is removed by CMP. Further, in the formation of embedded wiring, recently, copper or a copper alloy has been used as a conductive substance serving as a wiring material in order to improve the performance of an LSI. Since copper or copper alloy is difficult to finely process by the dry etching method frequently used in the formation of conventional aluminum alloy wiring, a thin film of copper or copper alloy is deposited on an insulating film in which grooves have been formed in advance.
- the so-called damascene method in which the thin film other than the trench is removed by CMP to form a buried wiring after being buried, is mainly employed.
- the polishing composition for metals used in CMP it generally contains a polishing accelerator such as an acid and an oxidizing agent, and further contains abrasive grains as necessary. It is also considered effective to use a polishing composition further added with a metal anticorrosive to improve the flatness of the polished object after polishing.
- Patent Document 2 discloses the use of a polishing composition containing aminoacetic acid and / or amidosulfuric acid, an oxidizing agent, benzotriazole, and water.
- polishing performance changes with time.
- Various factors have been confirmed for changes in polishing performance.
- One of them is that chemical substances in the polishing composition such as polishing accelerators and metal anticorrosives interact with the oxidizing agent, and the polishing composition changes. It is mentioned that pH changes.
- pH is very important, and it is common to set the pH of the polishing composition based on a Pourbaix diagram.
- Patent Document 3 it is disclosed in Patent Document 3 that it is important for a polishing composition for copper to have a pH of about 6.0 in order to form copper (I) oxide.
- the pH of the polishing composition is lowered, copper oxide is hardly formed on the copper surface, and the dissolution of metallic copper is increased.
- the pH of the polishing composition is increased, copper in the solution is deposited and adheres to the wafer surface, which may cause scratches. Therefore, in order to obtain a flat surface having no defects after CMP, it is required that the pH of the metal polishing composition is always stable.
- Patent Document 4 discloses a technique for stabilizing the pH of a polishing composition during copper polishing for about several minutes, a specific disclosure is provided for suppressing a change in pH over time over a longer period of time. Not technically difficult.
- An object of the present invention is a polishing composition used at the time of LSI production, which can suppress a change in pH with time after the addition of an oxidizing agent, and the polishing composition.
- An object of the present invention is to provide a polishing method and a substrate manufacturing method using the polishing method.
- the present inventors have found a polishing composition that has stable characteristics over a long period of time from addition of an oxidizing agent or the like for polishing use to use up.
- a polishing composition comprising a substance that lowers the pH in the presence of an oxidizing agent in an aqueous solution and a pH buffering agent, with respect to 100 g of the polishing composition.
- the difference between the pH immediately after adding 5.16 g of 31 wt% hydrogen peroxide water, that is, 1.6 g hydrogen peroxide, and the pH after standing for 8 days after adding the hydrogen peroxide water is absolutely A polishing composition having a value of 0.5 or less is provided.
- a polishing composition comprising a substance that lowers pH in the presence of an oxidizing agent in an aqueous solution and a pH control agent, and is 31 per 100 ml of the polishing composition.
- the polishing composition is characterized in that the amount of the basic substance is increased by 0.1 mM or more.
- polishing a metal with the method which concerns on the said 3rd aspect is provided.
- a polishing composition used for LSI manufacture the polishing composition having little change in pH over time, a polishing method using the polishing composition, and the polishing method are used.
- a method for manufacturing a substrate is provided.
- the polishing composition of this embodiment contains a pH lowering substance that lowers pH in the presence of an oxidizing agent in an aqueous solution, and a pH buffer, and optionally further contains abrasive grains and other additives. .
- the polishing composition is prepared by mixing these components in a solvent such as water.
- the polishing composition of the present embodiment is mainly used in polishing for manufacturing an LSI as described above in the background art section, particularly in a metal polishing step. More specifically, this polishing composition is used in applications such as polishing for forming metal wirings, contact holes, and via holes in LSI.
- the metal to be polished by the polishing composition include, for example, copper, tungsten, tantalum, titanium, cobalt, ruthenium, and oxides, alloys and compounds thereof. Among these, copper, tantalum, titanium, ruthenium and oxides, alloys and compounds thereof are preferable, and copper and oxides, alloys and compounds thereof are more preferable.
- the oxidizing agent has an action of oxidizing the surface of the object to be polished, and when an oxidizing agent is added to the polishing composition, the polishing rate by the polishing composition is advantageously improved.
- Usable oxidizing agent is, for example, peroxide.
- the peroxide include, for example, hydrogen peroxide, peracetic acid, percarbonate, urea peroxide and perchloric acid, and persulfates such as sodium persulfate, potassium persulfate and ammonium persulfate.
- persulfate and hydrogen peroxide are preferable from the viewpoint of polishing rate, and hydrogen peroxide is particularly preferable from the viewpoint of stability in an aqueous solution and reduction of environmental load.
- the content of the oxidizing agent in the polishing composition is preferably 0.1 g / L or more, more preferably 1 g / L or more, and further preferably 3 g / L or more. As the content of the oxidizing agent increases, the polishing rate by the polishing composition is advantageously improved.
- the content of the oxidizing agent in the polishing composition is also preferably 200 g / L or less, more preferably 100 g / L or less, and still more preferably 40 g / L or less.
- the content of the oxidizing agent decreases, the material cost of the polishing composition can be reduced, and in addition, it is possible to reduce the load of processing the polishing composition after polishing, that is, waste liquid processing. is there.
- a pH lowering substance that lowers pH in the presence of an oxidizing agent in an aqueous solution is a substance that satisfies the following conditions among a surfactant, a water-soluble polymer, an amine compound, a metal anticorrosive, and an organic solvent. That is, prepare an aqueous solution containing 0.05% by weight surfactant or water-soluble polymer, or 5 mmol / L amine compound, metal anticorrosive or organic solvent, and add potassium hydroxide or sulfuric acid as a pH regulator. The pH of the aqueous solution is adjusted to about 7.5.
- the condition is that the difference in pH at this time is 0.5 or more in absolute value.
- a surfactant that satisfies the condition as a pH lowering substance is a nonionic surfactant having a polyoxyalkylene group.
- nonionic surfactants include polyoxyethylene alkyl ethers.
- a water-soluble polymer that satisfies the conditions as a pH lowering substance is a water-soluble polymer having a nitrogen atom in its structure.
- Specific examples of the water-soluble polymer having a nitrogen atom in the structure include, for example, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, iminobispropylamine, dimethylaminoethylamine, dimethylaminopropylamine, diethylaminoethylamine, diethylaminopropylamine.
- water-soluble polymer having a nitrogen atom in the structure is selected from, for example, urea and epihalohydrin for the reaction condensate of the first raw material monomer and the second raw material monomer. What reacted at least 1 is mentioned.
- Examples of amine compounds that satisfy the conditions as a pH lowering substance include compounds having an amino group.
- Specific examples of the compound having an amino group include, for example, ethylenediaminetetraacetic acid (EDTA), N-methylethylenediamine, N, N, N, N-tetrakis (2-hydroxypropyl) ethylenediamine, 1,4-diazabicyclo [2, 2,2] octane, N, N-di-tert-butylethane-1,2-diamine.
- EDTA ethylenediaminetetraacetic acid
- N-methylethylenediamine N, N, N, N, N, N-tetrakis (2-hydroxypropyl) ethylenediamine
- 1,4-diazabicyclo [2, 2,2] octane N, N-di-tert-butylethane-1,2-diamine.
- the metal anticorrosive satisfying the condition as a low pH substance include, for example, 1H-benzotriazole, 5-methyl-1H-benzotriazole, 1- [N, N-bis (hydroxyethyl) aminomethyl] -4 -Methylbenzotriazole, 1- [N, N-bis (hydroxyethyl) aminomethyl] -5-methylbenzotriazole, 3-mercapto-1,2,4-triazole, 3-amino-5-mercapto-1,2 , 4-triazole, 3-mercaptomethyl-4H-1,2,4-triazole, benzoylhydrazine, salicylhydrazide, 4-hydroxybenzohydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, benzohydroxamic acid, salicylhydroxamic acid, 1H- Benzotriazole-1-methanol, 2 2-biphenol, and the like.
- Specific examples of the compound having an alcoholic hydroxyl group include methanol, ethanol, propanol, ethylene glycol, and polyethylene glycol.
- Table 1 shows the results of examining the change in pH over time in the presence and absence of hydrogen peroxide for an aqueous solution containing a part of the above as a specific example of the pH lowering substance. Specifically, after adjusting the pH of each aqueous solution containing a predetermined amount of the pH-lowering substance to about 7.5 by adding potassium hydroxide or sulfuric acid, the temperature is maintained at room temperature (23 ° C. to 27 ° C.) using a thermostatic bath. Under standing for 8 days.
- the pH value of the aqueous solution measured immediately after pH adjustment, the pH value of the aqueous solution measured after standing for 8 days, and the amount of change in pH generated after 8 days are indicated in the “No hydrogen peroxide” column, "Column,” pH after 8 days “column, and” pH change "column. Further, after adding 10.32 g of 31 wt% hydrogen peroxide water, that is, 3.2 g of hydrogen peroxide, to 100 g of the aqueous solution immediately after adjusting the pH to about 7.5, using a thermostatic bath (23 ° C. ( ⁇ 27 ° C) for 8 days.
- the pH value of the aqueous solution measured immediately after the addition of hydrogen peroxide, the pH value of the aqueous solution measured after standing for 8 days, and the amount of change in pH that occurred after 8 days are shown in the column “With hydrogen peroxide”.
- the values are shown in the “pH immediately after preparation” column, the “pH after 8 days” column, and the “pH change amount” column.
- the pH of the aqueous solution was measured at room temperature (23 ° C. to 27 ° C.) using a pH meter (F-52 manufactured by Horiba, Ltd.).
- the pH buffering agent is obtained by adding 5.16 g of 31 wt% hydrogen peroxide water to 100 g of the polishing composition, that is, pH of the polishing composition immediately after adding 1.6 g of hydrogen peroxide, and hydrogen peroxide water. It is blended in the polishing composition so that the difference from the pH of the polishing composition 8 days after the addition is 0.5 or less in absolute value. If the difference in pH is 0.5 or less in absolute value, it is possible to suppress the deterioration of the polishing performance of the polishing composition over time to such a level that there is no practical problem, and the polishing composition has excellent stability. Can provide things.
- the pH buffer is preferably a compound having an amide group, and more preferably an amphoteric amino acid further having at least one of a sulfo group and a carboxyl group in addition to the amide group.
- the pH buffer may be a compound represented by the following general formula (1).
- R 1 and R 3 each independently represents an unsubstituted or substituted linear alkyl group having 1 to 4 carbon atoms.
- R 2 is a hydrogen atom, a hydroxyl group, a sulfo group, a carboxyl group, an amino group, an amide group, a carbamoyl group, a nitro group, a methoxy group, an ethoxy group, a halogen group, a phenyl group, an acetyl group, or 1 to 4 carbon atoms.
- X represents a sulfo group, a carboxyl group, or a salt thereof.
- N- (2-acetamido) -iminodiacetic acid and N- (2-acetamido) -2-aminoethanesulfonic acid are preferable, and N- (2-acetamido) -2-aminoethanesulfonic acid is most preferable.
- (2-acetamido) -2-aminoethanesulfonic acid is most preferable.
- the mechanism by which the change with time of the pH of the polishing composition is suppressed by adding a pH buffer has not been clarified.
- the pH buffer has a sulfo group and a carboxyl group having a low acid dissociation constant, an acid dissociation equilibrium reaction can be expected between protons newly generated when the oxidizing agent and the pH lowering substance coexist.
- the pH buffering agent is a compound having an amide group, it is considered that ammonia generated as a result of hydrolysis by the oxidizing agent neutralizes the protons.
- the content of the pH buffering agent in the polishing composition is preferably 0.01 mmol / L or more, more preferably 0.1 mmol / L or more, further preferably 0.5 mmol / L or more, and even more preferably. 3.0 mmol / L or more, most preferably 5.0 mmol / L or more. This is desirable in that the effect of stabilizing the pH of the polishing composition is improved as the content of the pH buffering agent increases.
- the content of the pH buffering agent in the polishing composition is also preferably 300 mmol / L or less, more preferably 150 mmol / L or less, still more preferably 100 mmol / L or less, particularly preferably 50 mmol / L or less. .
- the pH of the polishing composition is preferably 3 or more, more preferably 5 or more, and further preferably 6 or more. As the pH increases, there is an advantage that excessive etching of the surface of the object to be polished by the polishing composition is less likely to occur.
- the pH of the polishing composition is also preferably 9 or less, more preferably 8 or less. As the pH decreases, there is an advantage that scratches on the surface of the object to be polished by the polishing composition can be suppressed.
- the polishing composition may further contain a polishing accelerator not classified into these in addition to the oxidizing agent, the pH-lowering substance, and the pH buffering agent.
- the polishing accelerator has a function of chemically etching the surface of the object to be polished, and functions to improve the polishing rate of the polishing composition.
- Usable polishing accelerators are, for example, inorganic acids, organic acids, and amino acids other than those exemplified above as pH lowering substances and pH buffering agents.
- the inorganic acid include sulfuric acid, nitric acid, boric acid, carbonic acid, hypophosphorous acid, phosphorous acid and phosphoric acid.
- organic acid examples include, for example, formic acid, acetic acid, propionic acid, butyric acid, valeric acid, 2-methylbutyric acid, n-hexanoic acid, 3,3-dimethylbutyric acid, 2-ethylbutyric acid, 4-methylpentanoic acid, n-heptanoic acid, 2-methylhexanoic acid, n-octanoic acid, 2-ethylhexanoic acid, benzoic acid, glycolic acid, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid Maleic acid, phthalic acid, malic acid, tartaric acid, citric acid and lactic acid.
- Organic sulfuric acids such as methanesulfonic acid, ethanesulfonic acid and isethionic acid can also be used.
- a salt such as an ammonium salt or alkali metal salt of the inorganic acid or organic acid may be used.
- a pH buffering action can be expected.
- amino acids include, for example, glycine, ⁇ -alanine, ⁇ -alanine, N-methylglycine, N, N-dimethylglycine, 2-aminobutyric acid, norvaline, valine, leucine, norleucine, isoleucine, phenylalanine, proline, Sarcosine, ornithine, lysine, taurine, serine, threonine, homoserine, tyrosine, bicine, tricine, 3,5-diiodo-tyrosine, ⁇ - (3,4-dihydroxyphenyl) -alanine, thyroxine, 4-hydroxy-proline, cysteine , Methionine, ethionine, lanthionine, cystathionine, cystine, cysteic acid, aspartic acid, glutamic acid, S- (carboxymethyl) -cysteine, 4-aminobutyric acid, asparagine,
- polishing accelerators are glycine, alanine, malic acid, tartaric acid, citric acid, glycolic acid, isethionic acid, or their ammonium salts or alkali metal salts from the viewpoint of improving the polishing rate.
- the content of the polishing accelerator in the polishing composition is preferably 0.01 g / L or more, more preferably 0.1 g / L or more, and further preferably 1 g / L or more. As the content of the polishing accelerator increases, there is an advantage that the polishing rate by the polishing composition is improved.
- the content of the polishing accelerator in the polishing composition is also preferably 50 g / L or less, more preferably 30 g / L or less, and still more preferably 15 g / L or less. As the content of the polishing accelerator decreases, there is an advantage that excessive etching of the surface of the object to be polished by the polishing accelerator is less likely to occur.
- the polishing composition may further contain, in addition to the oxidizing agent, the pH-lowering substance, and the pH buffering agent, a surfactant not classified therein.
- a surfactant is added to the polishing composition, dents are hardly formed on the side of the wiring formed by polishing using the polishing composition, and polishing is performed using the polishing composition. There is an advantage that dishing is less likely to occur on the surface of the object to be polished later.
- the surfactant used may be any of an anionic surfactant, a cationic surfactant, an amphoteric surfactant and a nonionic surfactant.
- a plurality of types of surfactants may be used in combination, and it is particularly preferable to use a combination of an anionic surfactant and a nonionic surfactant from the viewpoint of suppressing dents and dishing on the side of the wiring.
- anionic surfactant examples include, for example, polyoxyethylene alkyl sulfate ester, polyoxyethylene alkyl acetate ester, polyoxyethylene alkyl phosphate ester, alkyl sulfate ester, polyoxyethylene alkyl sulfate, alkyl sulfate, alkylbenzene sulfone.
- examples include acids, alkyl phosphate esters, polyoxyethylene alkyl phosphate esters, polyoxyethylene alkyl phosphate esters, polyoxyethylene sulfosuccinic acid, alkyl sulfosuccinic acid, alkyl naphthalene sulfonic acid, alkyl ether sulfuric acid, and salts thereof.
- anionic surfactants have high chemical or physical adsorptive power to the surface of the polishing object, they form a stronger protective film on the surface of the polishing object. This is advantageous in improving the flatness of the surface of the object to be polished after polishing with the polishing composition.
- cationic surfactant examples include alkyl trimethyl ammonium salt, alkyl dimethyl ammonium salt, alkyl benzyl dimethyl ammonium salt, and alkyl amine salt.
- amphoteric surfactants include alkyl betaines and alkyl amine oxides.
- nonionic surfactant examples include sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine, and alkylalkanolamide. Since these nonionic surfactants have a high chemical or physical adsorption force to the surface of the object to be polished, they form a stronger protective film on the surface of the object to be polished. This is advantageous in improving the flatness of the surface of the object to be polished after polishing with the polishing composition.
- the content of the surfactant in the polishing composition is preferably 0.001 g / L or more, more preferably 0.005 g / L or more, and still more preferably 0.01 g / L or more. As the content of the surfactant increases, there is an advantage that the flatness of the surface of the object to be polished after polishing with the polishing composition is improved.
- the content of the surfactant in the polishing composition is also preferably 10 g / L or less, more preferably 5 g / L or less, and still more preferably 1 g / L or less. As the surfactant content decreases, the polishing rate of the polishing composition is advantageously improved.
- the polishing composition may further contain, in addition to the oxidizing agent, the pH-lowering substance, and the pH buffering agent, a metal anticorrosive agent not classified therein.
- a metal anticorrosive agent is added to the polishing composition, as in the case of adding a surfactant, in addition to the fact that dents are less likely to be formed on the side of the wiring formed by polishing using the polishing composition.
- dishing is less likely to occur on the surface of the object to be polished after polishing with the polishing composition.
- the metal anticorrosive agent relaxes the oxidation of the surface of the object to be polished by the oxidizing agent, and also oxidizes the metal on the surface of the object to be polished by the oxidizing agent. It reacts with the resulting metal ions to form an insoluble complex.
- the function of this metal anticorrosive improves the flatness of the surface of the object to be polished after polishing with the polishing composition.
- the type of metal anticorrosive used is not particularly limited, but is preferably a heterocyclic compound.
- the number of heterocyclic rings in the heterocyclic compound is not particularly limited.
- the heterocyclic compound may be a monocyclic compound or a polycyclic compound having a condensed ring.
- isoindole compound indazole compound, purine compound, quinolidine compound, quinoline compound, isoquinoline compound, naphthyridine compound, phthalazine compound, quinoxaline compound, quinazoline compound, cinnoline compound, buteridine compound, thiazole compound, isothiazole compound, oxazole compound, iso Examples thereof include nitrogen-containing heterocyclic compounds such as oxazole compounds and furazane compounds.
- pyrazole compound examples include 1H-pyrazole, 4-nitro-3-pyrazole carboxylic acid and 3,5-pyrazole carboxylic acid.
- imidazole compound examples include, for example, imidazole, 1-methylimidazole, 2-methylimidazole, 4-methylimidazole, 1,2-dimethylpyrazole, 2-ethyl-4-methylimidazole, 2-isopropylimidazole, and benzimidazole. 5,6-dimethylbenzimidazole, 2-aminobenzimidazole, 2-chlorobenzimidazole and 2-methylbenzimidazole.
- triazole compound examples include, for example, 1,2,3-triazole, 1,2,4-triazole, 1-methyl-1,2,4-triazole, methyl-1H-1,2,4-triazole- 3-carboxylate, 1,2,4-triazole-3-carboxylic acid, methyl 1,2,4-triazole-3-carboxylate, 3-amino-1H-1,2,4-triazole, 3-amino- 5-benzyl-4H-1,2,4-triazole, 3-amino-5-methyl-4H-1,2,4-triazole, 3-nitro-1,2,4-triazole, 3-bromo-5 Nitro-1,2,4-triazole, 4- (1,2,4-triazol-1-yl) phenol, 4-amino-1,2,4-triazole, 4-amino-3,5-dipropyl-4H -1 2,4-triazole, 4-amino-3,5-dimethyl-4H-1,2,4-triazole, 4-amino-3,5-dipept
- tetrazole compound examples include 1H-tetrazole, 5-methyltetrazole, 5-aminotetrazole, and 5-phenyltetrazole.
- indole compounds include 1H-indole, 1-methyl-1H-indole, 2-methyl-1H-indole, 3-methyl-1H-indole, 4-methyl-1H-indole, 5-methyl- Examples include 1H-indole, 6-methyl-1H-indole, and 7-methyl-1H-indole.
- indazole compound examples include 1H-indazole and 5-amino-1H-indazole.
- preferred heterocyclic compounds are compounds having a triazole skeleton, and particularly preferred are 1,2,3-triazole and 1,2,4-triazole. Since these heterocyclic compounds have high chemical or physical adsorptive power to the surface of the object to be polished, a stronger protective film is formed on the surface of the object to be polished. This is advantageous in improving the flatness of the surface of the object to be polished after polishing with the polishing composition.
- the content of the metal anticorrosive in the polishing composition is preferably 0.001 g / L or more, more preferably 0.005 g / L or more, and still more preferably 0.01 g / L or more. As the content of the metal anticorrosive increases, there is an advantage that the flatness of the surface of the object to be polished after polishing with the polishing composition is improved.
- the content of the metal anticorrosive in the polishing composition is also preferably 10 g / L or less, more preferably 5 g / L or less, and further preferably 1 g / L or less. As the content of the metal anticorrosive decreases, there is an advantage that the polishing rate by the polishing composition is improved.
- the polishing composition may further contain a water-soluble polymer that is not classified in addition to the oxidizing agent, the pH-lowering substance, and the pH buffer.
- a water-soluble polymer is added to the polishing composition, the polishing rate by the polishing composition can be controlled by adsorbing the water-soluble polymer on the surface of the abrasive grains or the surface of the object to be polished.
- the insoluble components generated during polishing can be advantageously stabilized in the polishing composition.
- water-soluble polymers examples include, for example, polysaccharides such as alginic acid, pectinic acid, carboxymethylcellulose, curdlan and pullulan; polycarboxylic acids and salts thereof; vinyl-based polymers such as polyvinyl alcohol and polyacrolein; Examples include glycerin and polyglycerin esters. Of these, carboxymethylcellulose, pullulan, polycarboxylic acid and salts thereof, and polyvinyl alcohol are preferable, and pullulan and polyvinyl alcohol are particularly preferable.
- Abrasive grains have the effect of mechanically polishing an object to be polished, and when abrasive grains are added to the polishing composition, the polishing rate by the polishing composition is advantageously improved.
- the abrasive used may be any of inorganic particles, organic particles, and organic-inorganic composite particles.
- the inorganic particles include particles made of a metal oxide such as silica, alumina, ceria, titania, and silicon nitride particles, silicon carbide particles, and boron nitride particles. Of these, silica is preferable, and colloidal silica is particularly preferable.
- the organic particles include polymethyl methacrylate (PMMA) particles.
- the average primary particle diameter of the abrasive grains used is preferably 5 nm or more, more preferably 7 nm or more, and even more preferably 10 nm or more. As the average primary particle diameter of the abrasive grains becomes larger, there is an advantage that the polishing rate by the polishing composition is improved.
- the average primary particle diameter of the abrasive grains used is also preferably 100 nm or less, more preferably 60 nm or less, and still more preferably 40 nm or less. As the average primary particle diameter of the abrasive grains decreases, there is an advantage that dishing is less likely to occur on the surface of the object to be polished after polishing with the polishing composition.
- the content of abrasive grains in the polishing composition is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and still more preferably 0.05% by mass or more.
- the content of abrasive grains in the polishing composition is also preferably 5% by mass or less, more preferably 1% by mass or less, and still more preferably 0.5% by mass or less. As the content of the abrasive grains decreases, the material cost of the polishing composition can be reduced, and in addition, it is advantageous that dishing is less likely to occur on the surface of the object to be polished after polishing with the polishing composition. is there.
- the polishing composition of the second embodiment is mainly different from the polishing composition of the first embodiment in that it contains a pH control agent instead of a pH buffer.
- the polishing composition of the second embodiment will be described focusing on this difference.
- a pH control agent is defined as a compound that generates a basic substance in the presence of an oxidant in an aqueous solution. According to the polishing composition of 2nd Embodiment, it can suppress that pH of polishing composition changes with time by containing a pH fall substance and a pH control agent. Therefore, the time-dependent fall of the polishing performance of polishing composition can be suppressed to the extent which is practically satisfactory, and the polishing composition excellent in stability can be provided.
- Basic substances generated in the presence of oxidizing agents are ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, iminobispropylamine, dimethylamino. Any of ethylamine, dimethylaminopropylamine, and diethylaminoethylamine may be used, but ammonia is particularly desirable because of its small molecular weight and prompt control of pH.
- the pH control agent is preferably a compound having an amide group, more preferably an amphoteric amino acid further having at least one of a sulfo group and a carboxyl group in addition to the amide group.
- the pH control agent may be a compound represented by the following general formula (2).
- R 1 and R 3 each independently represents an unsubstituted or substituted linear alkyl group having 1 to 4 carbon atoms.
- R 2 is hydrogen atom, hydroxyl group, sulfo group, carboxyl group, phosphone group, amino group, amide group, carbamoyl group, nitro group, methoxy group, ethoxy group, halogen group, phenyl group, acetyl group, acyl group, carbon atom It represents either an unsubstituted or substituted alkyl group having a number of 1 to 4.
- X represents a sulfo group, a carboxyl group, or a salt thereof.
- N- (2-acetamido) -iminodiacetic acid and N- (2-acetamido) -2-aminoethanesulfonic acid are preferable, and N- (2-acetamido) -2-aminoethanesulfonic acid is most preferable.
- (2-acetamido) -2-aminoethanesulfonic acid is most preferable.
- a pH control agent As a specific example of a pH control agent, the results of examining the presence or absence of generation of a basic substance in the presence or absence of hydrogen peroxide in an aqueous solution containing one of the above-mentioned two compounds or an alternative compound are shown. 2. Specifically, an aqueous solution was prepared by mixing a predetermined amount of a pH controlling agent or a compound in place thereof with water, and then allowed to stand still at room temperature (23 ° C. to 27 ° C.) for 8 days using a thermostatic bath.
- Table 2 shows the results of qualitative and quantitative analysis of basic substances in aqueous solution immediately after addition of hydrogen peroxide and qualitative and quantitative analysis of basic substances in aqueous solution after standing for 8 days. "Basic substance concentration immediately after preparation” column and “Basic substance concentration after 8 days” column. In addition, the qualitative and quantitative determination of the basic substance in the aqueous solution was performed by ion chromatography.
- the content of the pH control agent in the polishing composition is preferably 0.01 mM or more, more preferably 0.1 mM or more, still more preferably 0.5 mM or more, even more preferably 3.0 mM or more, most preferably Preferably it is 5.0 mM or more. This is desirable in that the effect of stabilizing the pH of the polishing composition is improved as the content of the pH control agent increases.
- the content of the pH control agent in the polishing composition is also preferably 300 mM or less, more preferably 150 mM or less, still more preferably 100 mM or less, and particularly preferably 50 mM or less.
- the content of the pH control agent decreases, it is advantageous in that the material cost of the polishing composition can be reduced. In particular, if it is 50 mM or less, in addition to the effect of suppressing the change in pH of the polishing composition over time, the polishing rate can be maintained high.
- the first and second embodiments may be modified as follows.
- the polishing composition of the above embodiment may further contain a known additive such as a preservative or a fungicide as necessary.
- a known additive such as a preservative or a fungicide as necessary.
- the antiseptic and fungicide include, for example, isothiazoline preservatives such as 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one, and paraoxybenzoic acid. Examples include acid esters and phenoxyethanol.
- the polishing composition of the above embodiment may be a one-component type or a multi-component type including a two-component type.
- the polishing composition of the above embodiment may be prepared by diluting the stock solution of the polishing composition, for example, 10 times or more using a diluent such as water.
- polishing composition of the above embodiment may be used for purposes other than polishing during LSI manufacturing.
- Examples 1 to 9 and Comparative Examples 1 to 5 The polishing compositions of Examples 1 to 9 were prepared by mixing an oxidizing agent, a pH lowering substance, a pH buffer, a polishing accelerator, a surfactant and abrasive grains with water.
- polishing compositions of Comparative Examples 1 to 5 were prepared by mixing an oxidizing agent, a pH-lowering substance, a compound replacing a pH buffer, a polishing accelerator, a surfactant and abrasive grains with water.
- polishing compositions of Examples 1 to 9 and Comparative Examples 1 to 5 are all 51.6 g / L of 31 wt% hydrogen peroxide solution (that is, 16 g) as an oxidizing agent.
- polishing compositions 0.5 g / L of polyoxyethylene alkyl ether as a pH lowering substance and 1- [N, N-bis (hydroxyethyl) aminomethyl] -5-methylbenzotriazole and 1 -A surfactant containing 0.15 g / L of a 1: 1 mixture of [N, N-bis (hydroxyethyl) aminomethyl] -4-methylbenzotriazole and 10 g / L of glycine as a polishing accelerator Containing 0.3 g / L of ammonium lauryl ether sulfate and 0.1% by mass of colloidal silica having an average primary particle diameter of 30 nm by the BET method as abrasive grains. Moreover, all these polishing compositions have adjusted pH to about 7.5 using potassium hydroxide.
- compositions having compositions obtained by removing hydrogen peroxide from the polishing compositions of Examples 1 to 9 and Comparative Examples 1 to 5 were stored at room temperature (23 ° C. to 27 ° C.) for 8 days using a thermostatic bath. did.
- the pH value of the composition measured immediately after preparation, the pH value of the composition measured after standing for 8 days, and the amount of change in pH that occurred after 8 days are shown in the column “No hydrogen peroxide” in Table 3, respectively.
- the values are shown in the “pH immediately after preparation” column, the “pH after 8 days” column, and the “pH change amount” column.
- the pH was measured at room temperature (23 ° C. to 27 ° C.) using a pH meter (F-52 manufactured by Horiba, Ltd.).
- polishing rate change rate was determined according to the following formula.
- Polishing rate change rate (%) (polishing rate after 8 days ⁇ polishing rate immediately after preparation) / polishing rate immediately after preparation ⁇ 100
- Example 5 In addition, from the comparison of the results of Example 5 and Example 9, it was found that the pH was higher when N- (2-acetamido) -2-aminoethanesulfonic acid was used than N- (2-acetamido) -iminodiacetic acid. It was found that the amount of change and the rate of change in polishing rate were smaller. Further, from the comparison of the results of Examples 1 to 7, the rate of change in the polishing rate was ⁇ 2 by using N- (2-acetamido) -2-aminoethanesulfonic acid at a content of 0.5 mmol / L or more. %, It was found that the polishing performance was very stable.
- Example 11 to 21 and Comparative Examples 11 to 17 The polishing composition of Examples 11 to 21 was prepared by mixing an oxidizing agent, a pH lowering substance, a pH controller, a polishing accelerator, a surfactant and abrasive grains with water.
- polishing compositions of Comparative Examples 11 to 17 were prepared by mixing an oxidizing agent, a pH lowering substance, a compound in place of a pH control agent, a polishing accelerator, a surfactant and abrasive grains with water. Details of the pH control agent or the compound replacing the pH control agent in the polishing compositions of Examples 11 to 21 and Comparative Examples 11 to 17 are listed in the “pH control agent or compound replacing it” column of Table 6 and Table 7.
- polishing compositions (Ie, 16 g / L of hydrogen peroxide), 0.5 g / L of polyoxyethylene alkyl ether as a pH lowering substance and 1- [N, N-bis (hydroxyethyl) aminomethyl] -5-methylbenzo Containing 0.15 g / L of a 1: 1 mixture of triazole and 1- [N, N-bis (hydroxyethyl) aminomethyl] -4-methylbenzotriazole, and containing 10 g / L glycine as a polishing accelerator; It contains 0.3 g / L ammonium lauryl ether sulfate as a surfactant, and 0.1 quality colloidal silica having an average primary particle diameter of 30 nm by the BET method as abrasive grains. % Contain. Moreover, all these polishing compositions have adjusted pH to about 7.5 using potassium hydroxide.
- compositions having compositions obtained by removing hydrogen peroxide from the polishing compositions of Examples 11 to 21 and Comparative Examples 11 to 17 were stored at room temperature (23 ° C. to 27 ° C.) for 8 days using a thermostatic bath. did.
- the “no hydrogen peroxide” column in Table 6 and Table 7 shows the pH value of the composition measured immediately after preparation, the pH value of the composition measured after standing for 8 days, and the amount of change in pH generated in 8 days, respectively.
- the “pH immediately after preparation” column the “pH after 8 days” column, and the “pH change” column.
- the pH was measured at room temperature (23 ° C. to 27 ° C.) using a pH meter (F-52 manufactured by Horiba, Ltd.).
- ⁇ Polishing speed> The surfaces of the copper blanket wafers were polished under the third polishing conditions shown in Table 8 using the polishing compositions of Examples 11 to 21 and Comparative Examples 11 to 17 immediately after preparation or after standing for 8 days.
- Table 6 shows the polishing rate obtained with the polishing composition immediately after preparation, the polishing rate obtained with the polishing composition after standing for 8 days, and the rate of change in the polishing rate caused by standing for 8 days, respectively.
- the surface of the copper blanket wafer was polished under the fourth polishing conditions described in Table 9 using the polishing compositions of Examples 11 to 21 and Comparative Examples 11 to 17 immediately after preparation or after standing for 8 days.
- Table 6 shows the polishing rate obtained with the polishing composition immediately after preparation, the polishing rate obtained with the polishing composition after standing for 8 days, and the rate of change in the polishing rate caused by standing for 8 days, respectively.
- polishing rate change rate was determined according to the following formula.
- Polishing rate change rate (%) (polishing rate after 8 days ⁇ polishing rate immediately after preparation) / polishing rate immediately after preparation ⁇ 100
- N- (2-acetamido) -2-aminoethanesulfonic acid was used rather than N- (2-acetamido) -iminodiacetic acid. It was found that the amount of change in pH and the rate of change in polishing rate were smaller.
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Abstract
Description
酸化剤は研磨対象物の表面を酸化する作用を有し、研磨用組成物中に酸化剤を加えた場合には、研磨用組成物による研磨速度が向上する有利がある。
水溶液中において酸化剤との共存下でpHを低下させるpH低下物質は、界面活性剤、水溶性高分子、アミン化合物、金属防食剤および有機溶剤のうち、以下の条件を満たす物質である。すなわち、0.05重量%の界面活性剤または水溶性高分子、あるいは5mmol/Lのアミン化合物、金属防食剤または有機溶剤を含有した水溶液を用意し、水酸化カリウムまたは硫酸をpH調節剤として添加して水溶液のpHを約7.5に調整する。そして、この水溶液100gに対して31重量%過酸化水素水を10.32g、すなわち過酸化水素3.2gを添加した直後の水溶液のpHと、過酸化水素を添加してから常温(23℃~27℃)で8日間静置保管した後の水溶液のpHとを比較する。このときのpHの差が絶対値で0.5以上であるというのがその条件である。
pH緩衝剤は、研磨用組成物100gに対して31重量%過酸化水素水を5.16g、すなわち過酸化水素1.6gを添加した直後の研磨用組成物のpHと、過酸化水素水を添加してから8日後の研磨用組成物のpHとの差を絶対値で0.5以下とするべく研磨用組成物中に配合されている。このpHの差が絶対値で0.5以下であれば、研磨用組成物の研磨性能の経時的な低下を実用的に問題ない程度にまで抑えることができ、安定性に優れた研磨用組成物を提供できる。
研磨用組成物のpHは、3以上であることが好ましく、より好ましくは5以上であり、さらに好ましくは6以上である。pHが大きくなるにつれて、研磨用組成物による研磨対象物表面の過剰なエッチングが起こりにくくなる有利がある。
研磨用組成物は、酸化剤、pH低下物質、およびpH緩衝剤に加えて、それらに分類されない研磨促進剤をさらに含有してもよい。研磨促進剤は、研磨対象物の表面を化学的にエッチングする作用を有し、研磨用組成物による研磨速度を向上させる働きをする。
研磨用組成物は、酸化剤、pH低下物質、およびpH緩衝剤に加えて、それらに分類されない界面活性剤をさらに含有してもよい。研磨用組成物中に界面活性剤を加えた場合には、研磨用組成物を用いた研磨により形成される配線の脇に凹みが生じにくくなるのに加え、研磨用組成物を用いて研磨した後の研磨対象物の表面にディッシングが生じにくくなる有利がある。
研磨用組成物は、酸化剤、pH低下物質、およびpH緩衝剤に加えて、それらに分類されない金属防食剤をさらに含有してもよい。研磨用組成物中に金属防食剤を加えた場合には、界面活性剤を加えた場合と同様、研磨用組成物を用いた研磨により形成される配線の脇に凹みが生じにくくなるのに加え、研磨用組成物を用いて研磨した後の研磨対象物の表面にディッシングが生じにくくなる有利がある。また、金属防食剤は、研磨用組成物中に酸化剤が含まれている場合には、酸化剤による研磨対象物表面の酸化を緩和するとともに、酸化剤による研磨対象物表面の金属の酸化により生じる金属イオンと反応して不溶性の錯体を生成する働きをする。この金属防食剤の働きは、研磨用組成物を用いて研磨した後の研磨対象物の表面の平坦性を向上させる。
研磨用組成物は、酸化剤、pH低下物質、およびpH緩衝剤に加えて、それらに分類されない水溶性高分子をさらに含有してもよい。研磨用組成物中に水溶性高分子を加えた場合には、砥粒の表面または研磨対象物の表面に水溶性高分子が吸着することにより研磨用組成物による研磨速度をコントロールすることが可能であることに加え、研磨中に生じる不溶性の成分を研磨用組成物中で安定化することができる有利がある。
砥粒は研磨対象物を機械的に研磨する作用を有し、研磨用組成物中に砥粒を加えた場合には、研磨用組成物による研磨速度が向上する有利がある。
pH制御剤は、水溶液中において酸化剤との共存下で塩基性物質を発生する化合物として定義される。第2の実施形態の研磨用組成物によれば、pH低下物質とpH制御剤とを含有することにより、研磨用組成物のpHが経時的に変化するのを抑制することができる。そのため、研磨用組成物の研磨性能の経時的な低下を実用的に問題ない程度にまで抑えることができ、安定性に優れた研磨用組成物を提供できる。
酸化剤、pH低下物質、pH緩衝剤、研磨促進剤、界面活性剤および砥粒を水に混合し、実施例1~9の研磨用組成物を調製した。また、酸化剤、pH低下物質、pH緩衝剤に代わる化合物、研磨促進剤、界面活性剤および砥粒を水に混合し、比較例1~5の研磨用組成物を調製した。実施例1~9および比較例1~5の研磨用組成物中のpH緩衝剤またはpH緩衝剤に代わる化合物の詳細は、表3の“pH緩衝剤またはそれに代わる化合物”欄内の“名称”欄と“含有量”欄に示すとおりである。なお、表3には示していないが、実施例1~9および比較例1~5の研磨用組成物はいずれも、酸化剤として51.6g/Lの31重量%過酸化水素水(すなわち16g/Lの過酸化水素)を含有し、pH低下物質としてポリオキシエチレンアルキルエーテルを0.5g/Lおよび1-[N,N-ビス(ヒドロキシエチル)アミノメチル]-5-メチルベンゾトリアゾールと1-[N,N-ビス(ヒドロキシエチル)アミノメチル]-4-メチルベンゾトリアゾールの1:1混合物を0.15g/L含有し、研磨促進剤として10g/Lのグリシンを含有し、界面活性剤として0.3g/Lのラウリルエーテル硫酸アンモニウムを含有し、砥粒としてBET法による平均一次粒子径が30nmのコロイダルシリカを0.1質量%含有している。また、これらの研磨用組成物はいずれも、水酸化カリウムを用いてpHを約7.5に調整している。
実施例1~9および比較例1~5の研磨用組成物を、恒温槽を用いて常温(23℃~27℃)下で8日間静置保管した。調製直後に測定した研磨用組成物のpH値、8日間の静置後に測定した研磨用組成物のpH値、および8日間で生じたpHの変化量をそれぞれ表3の“過酸化水素あり”欄内の“調製直後のpH”欄、“8日後のpH”欄、および“pH変化量”欄に示す。
調製直後または8日間静置後の実施例1~9および比較例1~5の各研磨用組成物を用いて、銅ブランケットウェーハの表面を表4に記載の第1の研磨条件で60秒間研磨した。調製直後の研磨用組成物で得られた研磨速度、8日間の静置後の研磨用組成物で得られた研磨速度、および8日間の静置で生じた研磨速度の変化率をそれぞれ表3の“高圧研磨条件”欄内の“調製直後の研磨速度”欄、“8日後の研磨速度”欄、および“研磨速度変化率”欄に示す。
酸化剤、pH低下物質、pH制御剤、研磨促進剤、界面活性剤および砥粒を水に混合し、実施例11~21の研磨用組成物を調製した。また、酸化剤、pH低下物質、pH制御剤に代わる化合物、研磨促進剤、界面活性剤および砥粒を水に混合し、比較例11~17の研磨用組成物を調製した。実施例11~21および比較例11~17の研磨用組成物中のpH制御剤またはpH制御剤に代わる化合物の詳細は、を表6及び表7の“pH制御剤またはそれに代わる化合物”欄内の“名称”欄と“含有量”欄に示すとおりである。なお、表6及び表7には示していないが、実施例11~21および比較例11~17の研磨用組成物はいずれも、酸化剤として51.6g/Lの31重量%過酸化水素水(すなわち16g/Lの過酸化水素)を含有し、pH低下物質としてポリオキシエチレンアルキルエーテルを0.5g/Lおよび1-[N,N-ビス(ヒドロキシエチル)アミノメチル]-5-メチルベンゾトリアゾールと1-[N,N-ビス(ヒドロキシエチル)アミノメチル]-4-メチルベンゾトリアゾールの1:1混合物を0.15g/L含有し、研磨促進剤として10g/Lのグリシンを含有し、界面活性剤として0.3g/Lのラウリルエーテル硫酸アンモニウムを含有し、砥粒としてBET法による平均一次粒子径が30nmのコロイダルシリカを0.1質量%含有している。また、これらの研磨用組成物はいずれも、水酸化カリウムを用いてpHを約7.5に調整している。
実施例11~21および比較例11~17の研磨用組成物を、恒温槽を用いて常温(23℃~27℃)下で8日間静置保管した。調製直後に測定した研磨用組成物のpH値、8日間の静置後に測定した研磨用組成物のpH値、および8日間で生じたpHの変化量をそれぞれ表6及び表7の“過酸化水素あり”欄内の“調製直後のpH”欄、“8日後のpH”欄、および“pH変化量”欄に示す。
調製直後または8日間静置後の実施例11~21および比較例11~17の各研磨用組成物を用いて、銅ブランケットウェーハの表面を表8に記載の第3の研磨条件で研磨した。調製直後の研磨用組成物で得られた研磨速度、8日間の静置後の研磨用組成物で得られた研磨速度、および8日間の静置で生じた研磨速度の変化率をそれぞれ表6及び表7の“高圧研磨条件”欄内の“調製直後の研磨速度”欄、“8日後の研磨速度”欄、および“研磨速度変化率”欄に示す。
実施例11~21および比較例11~17の各研磨用組成物について、調製直後の研磨用組成物中の塩基性物質の濃度と8日間静置した後の研磨用組成物中の塩基性物質の濃度とを測定した。その濃度の差を表6及び表7の“塩基性物質濃度増加量”欄に示す。なお、各研磨用組成物中の塩基性物質の定量および定性はイオンクロマト分析法で行った。
Claims (16)
- 水溶液中において酸化剤との共存下でpHを低下させる物質、およびpH緩衝剤を含有する研磨用組成物であって、研磨用組成物100gに対して31重量%過酸化水素水を5.16g添加した直後の研磨用組成物のpHと、過酸化水素水を添加してから8日間静置した後の研磨用組成物のpHとの差が絶対値で0.5以下であることを特徴とする研磨用組成物。
- 前記pH緩衝剤がアミド基を有する化合物である、請求項1に記載の研磨用組成物。
- 前記pH緩衝剤がスルホ基およびカルボキシル基の少なくともいずれか一方を有する両性アミノ酸である、請求項1または2に記載の研磨用組成物。
- 前記一般式(1)において、Xはスルホ基またはその塩である、請求項4に記載の研磨用組成物。
- 水溶液中において酸化剤との共存下でpHを低下させる物質、およびpH制御剤を含有する研磨用組成物であって、研磨用組成物100mlに対して31重量%過酸化水素水を5.16g添加した直後の研磨用組成物中の塩基性物質の量に比べて、過酸化水素水を添加してから8日間静置した後の研磨用組成物中の塩基性物質の量が0.1mM以上増加することを特徴とする研磨用組成物。
- 前記研磨用組成物100mlに対して31重量%過酸化水素水を5.16g添加した直後の研磨用組成物のpHと、過酸化水素水を添加してから8日間静置した後の研磨用組成物のpHとの差が絶対値で0.5以下である、請求項6に記載の研磨用組成物。
- 前記塩基性化合物がアンモニアである、請求項6または7に記載の研磨用組成物。
- 前記pH制御剤を5.0mM含んだ100mlの水溶液に31重量%過酸化水素水を10.32g添加した直後の水溶液中の塩基性物質の量に比べて、過酸化水素水を添加してから8日間静置した後の水溶液中の塩基性物質の量が0.2mM以上増加する、請求項6~8のいずれか一項に記載の研磨用組成物。
- 前記pH制御剤がアミド基を有する化合物である、請求項6~9のいずれか一項に記載の研磨用組成物。
- 前記pH制御剤がスルホ基およびカルボキシル基の少なくともいずれか一方を有する両性アミノ酸である、請求項6~10のいずれか一項に記載の研磨用組成物。
- 前記一般式(2)において、Xはスルホ基またはその塩である、請求項12に記載の研磨用組成物。
- 請求項1~13のいずれか一項に記載の研磨用組成物を用いて、金属を研磨する方法。
- 研磨時に研磨用組成物に酸化剤を混合することを特徴とする請求項14に記載の研磨方法。
- 請求項14または15に記載の方法で金属を研磨する工程を有する、金属を含む基板の製造方法。
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EP12763096.0A EP2693459A4 (en) | 2011-03-30 | 2012-03-28 | POLISHING COMPOSITION AND POLISHING METHOD |
CN201280025872.2A CN103562337A (zh) | 2011-03-30 | 2012-03-28 | 研磨用组合物和研磨方法 |
US14/007,749 US20140014872A1 (en) | 2011-03-30 | 2012-03-28 | Polishing composition and polishing method |
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JP2011076475A JP2012212723A (ja) | 2011-03-30 | 2011-03-30 | 研磨用組成物および研磨方法 |
JP2011122438A JP2012253076A (ja) | 2011-05-31 | 2011-05-31 | 研磨用組成物および研磨方法 |
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US (1) | US20140014872A1 (ja) |
EP (1) | EP2693459A4 (ja) |
KR (1) | KR20140019403A (ja) |
CN (1) | CN103562337A (ja) |
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CN105659357A (zh) * | 2013-10-25 | 2016-06-08 | 花王株式会社 | 硅晶片用研磨液组合物 |
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US20140011362A1 (en) * | 2012-07-06 | 2014-01-09 | Basf Se | Chemical mechanical polishing (cmp) composition comprising a non-ionic surfactant and an aromatic compound comprising at least one acid group |
SG11201600138XA (en) | 2013-07-11 | 2016-02-26 | Basf Se | Chemical-mechanical polishing composition comprising benzotriazole derivatives as corrosion inhibitors |
US10217645B2 (en) * | 2014-07-25 | 2019-02-26 | Versum Materials Us, Llc | Chemical mechanical polishing (CMP) of cobalt-containing substrate |
JP5893700B1 (ja) | 2014-09-26 | 2016-03-23 | 花王株式会社 | 酸化珪素膜用研磨液組成物 |
JP6989493B2 (ja) * | 2015-09-03 | 2022-01-05 | シーエムシー マテリアルズ,インコーポレイティド | 誘電体基板を加工するための方法及び組成物 |
KR101628878B1 (ko) * | 2015-09-25 | 2016-06-16 | 영창케미칼 주식회사 | Cmp용 슬러리 조성물 및 이를 이용한 연마방법 |
KR102588218B1 (ko) * | 2017-09-22 | 2023-10-13 | 가부시키가이샤 후지미인코퍼레이티드 | 표면 처리 조성물, 표면 처리 조성물의 제조 방법, 표면 처리 방법 및 반도체 기판의 제조 방법 |
KR102337949B1 (ko) * | 2019-07-10 | 2021-12-14 | 주식회사 케이씨텍 | 멀티 필름 연마용 cmp 슬러리 조성물 및 그를 이용한 연마 방법 |
CN115160933B (zh) * | 2022-07-27 | 2023-11-28 | 河北工业大学 | 一种用于钴互连集成电路钴cmp的碱性抛光液及其制备方法 |
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- 2012-03-28 CN CN201280025872.2A patent/CN103562337A/zh active Pending
- 2012-03-28 WO PCT/JP2012/058195 patent/WO2012133561A1/ja active Application Filing
- 2012-03-28 US US14/007,749 patent/US20140014872A1/en not_active Abandoned
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EP2693459A1 (en) | 2014-02-05 |
US20140014872A1 (en) | 2014-01-16 |
TW201307540A (zh) | 2013-02-16 |
TWI525182B (zh) | 2016-03-11 |
EP2693459A4 (en) | 2015-04-22 |
CN103562337A (zh) | 2014-02-05 |
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