WO2021117689A1 - 化学機械研磨組成物及びそれを用いた化学機械研磨方法 - Google Patents
化学機械研磨組成物及びそれを用いた化学機械研磨方法 Download PDFInfo
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- WO2021117689A1 WO2021117689A1 PCT/JP2020/045532 JP2020045532W WO2021117689A1 WO 2021117689 A1 WO2021117689 A1 WO 2021117689A1 JP 2020045532 W JP2020045532 W JP 2020045532W WO 2021117689 A1 WO2021117689 A1 WO 2021117689A1
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- polishing composition
- mechanical polishing
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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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- 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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- 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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
- H10P52/40—Chemomechanical polishing [CMP]
- H10P52/402—Chemomechanical polishing [CMP] of semiconductor materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/12—Preparing bulk and homogeneous wafers
- H10P90/129—Preparing bulk and homogeneous wafers by polishing
Definitions
- the present invention relates to a chemical mechanical polishing composition and a chemical mechanical polishing method using the same.
- CMP chemical mechanical polishing
- the finish polishing step after the pre-polishing step usually, by using a polishing composition (also called CMP slurry) having a weaker polishing power than the pre-polishing step, the surface quality of the base material, for example, the surface such as surface defects and haze characteristics, is used. Quality is improved.
- a surface defect inspection device is generally used to manage surface defects of a base material such as a silicon wafer.
- the defects detected by the surface defect inspection apparatus include foreign substances and residues on the substrate that could not be completely removed by the polishing step and the subsequent rinsing step.
- a surface defect inspection device for example, by irradiating the surface of the base material with light such as laser light and detecting the reflected light or scattered light generated on the surface of the base material, defects existing on the surface of the base material are detected. Those that detect the above are generally known.
- HEC which is one of the cellulose derivatives that can be used as a water-soluble polymer in a CMP slurry, can improve the wettability of the surface to be polished of a base material such as a silicon wafer and keep the surface of the base material hydrophilic. it can. Therefore, by using HEC, the interaction between the base material and the slurry occurs well, and the surface quality of the base material can be improved.
- Such characteristics of HEC are extremely effective in CMP polishing of a base material, particularly finish CMP polishing of a silicon wafer, and combined with convenience such as high dispersibility in an aqueous solvent, HEC is used in a polishing composition. Is required.
- the CMP slurry may be filtered by a filter immediately before CMP is performed.
- POU Point Of Use
- the polishing composition it is desirable for the polishing composition to perform POU filter filtration with a filter having a smaller pore size. That is, the polishing composition is required to have excellent filterability such that clogging of the filter is satisfactorily suppressed even when a filter having a small pore size is used.
- the CMP slurry used for chemical mechanical polishing may be diluted from the state at the time of purchase or storage according to the polishing conditions desired by the user, the specifications required for the base material, and the like.
- the above-mentioned filtration is performed with the diluted CMP slurry, it is important to suppress clogging with the filter and improve the POU filter filterability even after the dilution.
- HEC Due to the characteristics of HEC as described above, it is strongly desired to use HEC especially in the slurry used for CMP of a silicon wafer.
- HEC a CMP slurry containing an abrasive, HEC, and a basic component (for example, ammonia) generally used as an accelerator for mechanical polishing
- HEC adsorbs to an abrasive such as silica to form aggregates. Since it tends to be formed, it tends to be inferior in dispersibility and filterability as compared with the slurry before dilution due to a change in the compounding ratio due to dilution and the like.
- the polishing composition containing HEC is inferior in filterability as compared with the polishing composition not containing HEC, especially when the composition is diluted, and it becomes difficult to filter the POU filter with a smaller pore size.
- the improvement of the surface quality of the base material is limited. Therefore, there is a need to solve the problem of deterioration of POU filter filterability after dilution that occurs in a CMP slurry containing an abrasive, HEC, and a basic component.
- the present invention provides a chemical mechanical polishing composition containing HEC and a chemical mechanical polishing method using the same, which exhibits improved POU filter filterability that allows POU filter filtration even with a filter having a small pore size after dilution.
- the purpose is to do.
- the present invention that achieves the above object is as follows.
- the chemical mechanical polishing composition according to (1) or (2), wherein the abrasive has a primary particle size of 20 to 40 nm.
- the surfactant contains both an alkylene polyalkylene oxide amine polymer and a polyoxyalkylene alkyl ether.
- the surfactant contains an alkylene polyalkylene oxide amine polymer, and the alkylene polyalkylene oxide amine polymer contains at least two repeating structural units containing an alkylene group and a tertiary amine in which a polyalkylene oxide group is bonded to an N atom.
- the surfactant contains a polyoxyalkylene alkyl ether, and the polyoxyalkylene alkyl ether is represented by the formula (i) RO- (AO) n- H, in which R is a linear or branched C 1. ⁇ C 15 Alkyl group, A is an alkylene group selected from the group consisting of an ethylene group, a propylene group and a combination thereof, and n represents the average number of moles of AO added, which is a number of 2 to 30.
- the chemical mechanical polishing composition according to any one of (1) to (7).
- the polymer containing the polyvinyl alcohol structural unit is a polyvinyl alcohol-polyalkylene oxide graft copolymer containing a polyvinyl alcohol structural unit in the main chain and a polyalkylene oxide structural unit in the side chain, or a polyalkylene oxide in the main chain.
- the abrasive is selected from the group consisting of alumina, silica, ceria, zirconia and combinations thereof.
- the chemical mechanical polishing composition according to (1) which contains a water-soluble polymer containing a polymer containing a polyvinyl alcohol structural unit and an aqueous carrier.
- a substrate of a substrate comprising a step of moving the polishing pad relative to the substrate by placing the chemical mechanical polishing composition between them, and a step of abrading at least a part of the substrate to polish the substrate.
- Chemical mechanical polishing method (15) The chemical mechanical polishing method for a substrate according to (14), which comprises a step of diluting the chemical mechanical polishing composition before the contact step and then filtering the composition with a filter having a pore size of 5 ⁇ m or less.
- a HEC having a small weight average molecular weight more specifically, a HEC having a weight average molecular weight of 200,000 or less is interfaced.
- an activator eg, a nonionic surfactant
- the surface quality (surface defects, nano) of the base material is compared with the case where the conventional polishing composition is used. Polishing defects) can be improved.
- the chemical mechanical polishing composition of the present invention is for polishing a base material, and is used for polishing a base material.
- Abrasive Hydroxyethyl cellulose having a weight average molecular weight of 200,000 or less, Basic ingredients, It is characterized by containing a surfactant and an aqueous carrier.
- a cellulose derivative generally used as a water-soluble polymer is extremely useful for enhancing the wettability of the surface to be polished of the base material. ..
- This improvement in wettability is brought about because the cellulose derivative has the property of being able to maintain the surface of the substrate as hydrophilic.
- HEC hydroxyethyl cellulose
- a surfactant for example, a nonionic surfactant
- the use of HEC is strongly desired in the CMP of the base material, particularly in the CMP slurry used for CMP finish polishing of silicon wafers.
- HEC is one of the cellulose derivatives, and since it is made from naturally occurring cellulose, it may bring about a water-insoluble matter derived from cellulose, and an abrasive such as silica is adsorbed on the water-insoluble matter and coagulated.
- Aggregates may be generated. Further, since HEC itself also exhibits high adsorptivity to the abrasive, it has a property of causing aggregation of the abrasive. Polishing with a CMP slurry containing such aggregates adversely affects the surface quality of the base material, such as increasing defects on the surface to be polished and causing nano-sized polishing scratches (nano-polishing defects). obtain.
- filtration can be performed by a filter immediately before chemical mechanical polishing is performed by the CMP device.
- a filter can be installed between the slurry supply unit and the place where the CMP apparatus is used.
- Such filter filtration near the place of use is called POU filter filtration and is an effective process for improving the surface quality of a substrate such as a silicon wafer.
- POU filter filtration is an effective process for improving the surface quality of a substrate such as a silicon wafer.
- the smaller the pore size of the filter the smaller the aggregate. Etc. can be removed by filtration, so that the surface quality of the base material is further improved.
- the polishing composition used for chemical mechanical polishing may be diluted from the state at the time of purchase or storage according to the polishing conditions desired by the user, the specifications required for the base material, and the like. .. Therefore, it is possible to suppress clogging of the filter and improve the filterability of the POU filter even in the diluted slurry so that the polishing composition can be efficiently filtered using a filter having a smaller pore size. is important.
- various developments have been made to improve the filterability of the polishing composition (that is, the filterability of the polishing composition before dilution).
- the polishing composition may be diluted and used immediately before it is used in CMP.
- polishing composition containing HEC an abrasive and a basic component (for example, ammonia), which is particularly useful for CMP of a silicon wafer, is diluted, the compounding ratio of the composition changes, and HEC polishes silica or the like.
- the polishing composition containing HEC is inferior in filterability after dilution as compared with the polishing composition not containing HEC because it tends to be adsorbed on the agent to form aggregates or water-insoluble substances derived from cellulose are generated. It is known. Therefore, it is desired to develop a chemical mechanical polishing composition that exhibits improved POU filter filterability after dilution, and in particular, in addition to HEC, which provides excellent wettability but can adversely affect the filterability.
- a chemical mechanical polishing composition containing an abrasive such as silica and a basic component such as ammonia, it is desired to have a high POU filter filterability that allows filtration using a filter having a smaller pore size. ..
- the present inventors have conducted various studies on each component of the polishing composition so that the polishing composition containing HEC, an abrasive and a basic component has high POU filter filterability after being diluted.
- HEC having a low weight average molecular weight, more specifically 200,000 or less, preferably 150,000 or less, in combination with a surfactant, the polishing composition can be obtained only before dilution.
- HEC having a low weight average molecular weight, more specifically 200,000 or less, preferably 150,000 or less
- the molecular size of the HEC itself is reduced, making it easier for the HEC and the HEC-attached abrasive to pass through the filter, and on top of that, the surfactant. It has been found that by adding the above to improve the dispersion stability of the polishing composition, it is possible to satisfactorily disperse the abrasive, HEC and the like, and make it easier for them to pass through the filter. Such an effect of the present invention is satisfactorily exhibited regardless of the size of the abrasive (particularly the primary particle size), but the effect is suitably used in the finishing CMP polishing step of a silicon substrate.
- the chemical mechanical polishing composition according to the present invention is extremely practical, especially in the finish polishing step of a silicon base material.
- the chemical mechanical polishing composition according to the present invention can also be used for other polishing steps and / or polishing of other base materials.
- the abrasive in the present invention may be any suitable abrasive known to those skilled in the art in chemical mechanical polishing of semiconductor substrates such as silicon wafers.
- Abrasives include, but are not limited to, alumina (eg, ⁇ -alumina, ⁇ -alumina, ⁇ -alumina, and fumed alumina), silica (eg, colloidal silica, precipitated silica, fumed silica), ceria, and the like. It may be an abrasive selected from the group consisting of titania, zirconia, germania, magnesia, their co-formed products, and any combination thereof.
- the abrasive is selected from the group consisting of alumina, silica, ceria, zirconia and combinations thereof, more preferably silica, particularly colloidal silica or ceria, and most preferably colloidal silica.
- the abrasive can have any suitable particle size.
- the abrasive can have an average primary particle size of 5 nm or more, 10 nm or more, 15 nm or more, or 20 nm or more.
- the abrasive preferably has an average primary particle size of 15 nm or more, preferably 20 nm or more, in order to sufficiently suppress the agglomeration of the abrasive and obtain improved POU filter filterability while ensuring the polishing rate. It is more preferable to have an average primary particle size.
- the abrasive can have an average primary particle size of 200 nm or less, 150 nm or less, 100 nm or less, 80 nm or less, 60 nm or less, 50 nm or less, or 40 nm or less.
- the abrasive preferably has an average primary particle size of 50 nm or less, more preferably 40 nm or less.
- the abrasive is, for example, 5 to 200 nm, 10 to 200 nm, 20 to 200 nm, 5 to 100 nm, 10 to 100 nm, 20 to 100 nm, 5 to 50 nm, 10 to 50 nm, 20 to 50 nm, 5 to 40 nm, 10 to.
- the abrasive can have an average primary particle size in the range of 40 nm or 20-40 nm, and it is particularly preferable that the abrasive has an average primary particle size in the range of 20-40 nm from the viewpoint of further improving the filterability of the POU filter. Therefore, the most preferable abrasive in the present invention is silica having an average primary particle size of 20 to 40 nm (for example, colloidal silica).
- the abrasive is preferable from the viewpoint of improving the polishing rate and improving the surface quality of the base material to be polished.
- the average primary particle size of the abrasive can be determined by observing with a scanning electron microscope (SEM) or a transmission electron microscope (TEM) and performing image analysis. Further, the average secondary particle size can be measured as a volume average particle size by using a laser light scattering method.
- the polishing agent is based on the mass of the aqueous carrier and all the components dissolved or suspended therein, for example, 0.01% by mass or more, 0.02% by mass or more, 0.05% by mass or more, or 0. It may be present in the chemical mechanical polishing composition in an amount of 1% by mass or more and 20% by mass or less, 15% by mass or less, 12% by mass or less, or 10% by mass or less.
- the abrasive may be present in the chemical mechanical polishing composition in an amount of preferably 0.01 to 20% by mass, more preferably 0.05 to 15% by mass, and most preferably 0.1 to 10% by mass.
- the chemical mechanical polishing composition in a concentrated state may contain, for example, 1 to 15% by mass, preferably 1 to 10% by mass of an abrasive. Further, the chemical mechanical polishing composition after dilution (when polishing is used) may contain, for example, 0.01 to 3% by mass, preferably 0.01 to 1% by mass of an abrasive.
- HEC Hydroxyethyl cellulose
- HEC Hydroxyethyl cellulose
- Mw weight average molecular weight
- HEC is, for example, 0.001% by mass or more, 0.002% by mass or more, 0.005% by mass or more, or 0.01 based on the mass of the aqueous carrier and all the components dissolved or suspended therein. It may be present in the chemical mechanical polishing composition in an amount of 2.0% by mass or less, 1.5% by mass or less, 1.2% by mass or less, or 1.0% by mass or less. HEC is preferably in an amount of 0.001 to 2.0% by weight, more preferably 0.005 to 1.5% by weight, most preferably 0.01 to 1.0% by weight in the chemical mechanical polishing composition. May exist.
- the basic component in the present invention can chemically act on the surface of a semiconductor base material such as a silicon wafer to assist mechanical polishing with an abrasive.
- the basic component is not particularly limited, but the basic component is, for example, ammonia, potassium hydroxide, sodium hydroxide, ammonium carbonate, potassium carbonate, sodium carbonate, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, monoethanolamine.
- the basic component is selected from the group consisting of ammonia, potassium hydroxide, sodium hydroxide, ammonium carbonate, potassium carbonate, and sodium carbonate. More preferably, the basic component is ammonia, potassium hydroxide, or sodium hydroxide, and most preferably ammonia.
- the basic component is, for example, 0.001% by mass or more, 0.002% by mass or more, 0.005% by mass or more, 0. 01% by mass or more, or 0.1% by mass or more, and 5.0% by mass or less, 3.0% by mass or less, 1.5% by mass or less, 1.2% by mass or less, or 1.0% by mass It may be present in the chemical mechanical polishing composition in the following amounts.
- the basic component is preferably 0.001 to 5.0% by mass, more preferably 0.005 to 1.5% by mass, and most preferably 0.01 to 1.0% by mass of the chemical mechanical polishing composition. May be present in.
- the surfactant in the present invention is an essential component in the chemical mechanical polishing composition according to the present invention, but the type of the surfactant is arbitrary known to those skilled in the art in chemical mechanical polishing of semiconductor substrates such as silicon wafers. It may be a suitable surfactant.
- the filterability of the POU filter of the polishing composition after dilution can be improved.
- the surfactant can typically be an anionic surfactant or a nonionic surfactant, preferably a nonionic surfactant. It is preferable to use a nonionic surfactant as the surfactant because not only the pH can be easily adjusted but also the compatibility with HEC is excellent. Further, by polishing a substrate such as a silicon wafer with a chemical mechanical polishing composition containing a surfactant, excellent surface quality (for example, haze) can be achieved.
- the nonionic surfactant is not particularly limited, and for example, polyoxyalkylene alkyl ether (for example, polyoxyethylene isopropyl ether, polyoxyethylene isobutyl ether, polyoxyethylene sec-butyl ether, polyoxyethylene-t-butyl ether, etc.
- polyoxyalkylene alkyl ether for example, polyoxyethylene isopropyl ether, polyoxyethylene isobutyl ether, polyoxyethylene sec-butyl ether, polyoxyethylene-t-butyl ether, etc.
- Polyoxyethylene isopentyl ether polyoxyethylene isohexyl ether, polyoxyethylene heptyl ether, polyoxyethylene isoheptyl ether, polyoxyethylene isooctyl ether, polyoxyethylene isononyl ether, polyoxyethylene isodecyl ether, polyoxy Ethethyleneoxypropylene 2-propyl heptyl ether, polyoxyethylene undecyl ether, polyoxyethylene isoundecyl ether, polyoxyethylene lauryl ether, polyoxyethylene isolauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene isotridecyl Ether, polyoxyethylene tetradecyl ether, polyoxyethylene isotetradecyl ether, polyoxyethylene pentadecyl ether, polyoxyethylene isopentadecyl ether, polyoxypropylene methyl ether, polyoxypropylene ethyl ether, polyoxypropylene butyl
- Acid ester polyoxyethylene distearate, polyoxyethylene monooleic acid ester, polyoxyethylene dioleic acid ester, polyoxyethylene monolauric acid ester, etc.); Polyethylene glycol fatty acid ester (eg, polyethylene glycol monostearate, monoolein) Polyethylene glycol acid, etc.); Glycerin fatty acid esters (eg, lecithin, high molecular weight emulsifiers, glycerin monostearate, etc.); Polyglycerin fatty acid esters (eg, polyglyceryl monooleate, polyglyceryl pentaoleate, polyglyceryl decaoleate, etc.) Polyoxyethylene glycerin fatty acid esters (eg, polyoxyethylene glycerin monostearate); sorbitan fatty acid esters (eg, sorbitan monolaurate, sorbitan monooleate, sorbitan trioleate); polyoxyethylene sorbitan
- the surfactant in the present invention is determined according to the type of surfactant used, but is, for example, 0.01 ppm or more, based on the mass of the aqueous carrier and all the components dissolved or suspended therein. Amounts of 0.05 ppm or more, 0.1 ppm or more, 0.5 ppm or more, 1 ppm or more, 2 ppm or more, 5 ppm or more, or 10 ppm or more, and 5000 ppm or less, 3000 ppm or less, 1000 ppm or less, 500 ppm or less, 300 ppm or less, 100 ppm or less. May be present in the chemical mechanical polishing composition.
- the surfactant is preferably 0.1 to 5000 ppm (0.00001 to 0.5% by mass), more preferably 1 to 1000 ppm (0.0001 to 0.1% by mass), and most preferably 5 to 1000 ppm (0). 0005 to 0.1% by weight) may be present in the chemical mechanical polishing composition.
- the surfactant in the present invention is among alkylene polyalkylene oxide amine polymers and polyoxyalkylene alkyl ethers. It is preferable to contain at least one kind. More preferably, the surfactant in the present invention may contain both an alkylene polyalkylene oxide amine polymer and a polyoxyalkylene alkyl ether. These surfactants are extremely effective surfactants for reducing the haze of the substrate.
- the chemical mechanical polishing composition of the present invention preferably contains an alkylene polyalkylene oxide amine polymer as a surfactant in order to achieve improved POU filter filterability and / or excellent haze properties. Further, when the chemically mechanically polished composition of the present invention contains an alkylene polyalkylene oxide amine polymer, the alkylene polyalkylene oxide amine polymer contains a tertiary amine in which an alkylene group and a polyalkylene oxide group are bonded to N atoms. It is more preferable that it contains at least two repeating structural units.
- the alkylene polyalkylene oxide amine polymer As described above, in the chemical mechanical polishing composition according to the present invention, by using the alkylene polyalkylene oxide amine polymer, a higher haze reduction effect is achieved while obtaining further improved POU filter filterability. It becomes possible. As a matter of course, when the alkylene polyalkylene oxide amine polymer is used in the chemical mechanical polishing composition, it can be used together with other surfactants.
- R 1 is a linear or branched C 1 to C 10 alkylene group, preferably a linear or branched C 1 to C 4 alkylene group, and more preferably an ethylene group.
- R 2 is an alkylene group selected from the group consisting of an ethylene group, a propylene group, a butylene group and a combination thereof, x is an integer of 2 to 1000, preferably 2 to 20, and y is 2 to 10000. It is preferably an integer of 2 to 500.
- R 2 is preferably selected from an ethylene group and / or a propylene group. When R 2 contains both an ethylene group and a propylene group, the ethylene group and the propylene group are preferably in a molar ratio of 80:20 to 90:10.
- the above-mentioned alkylene polyalkylene oxide amine polymer preferably has a solubility parameter (SP) of 9 to 10.
- SP solubility parameter
- the solubility parameter (SP) is referred to as Ueda et al., Research on Paints, No. 152, Oct. 2010, calculated using the Fedors method described on pages 41-46.
- the alkylene polyalkylene oxide amine polymer can have, for example, an average molecular weight of 5,000 to 100,000 or 10,000 to 80,000. If the average molecular weight is less than 5,000, the haze may not be sufficiently improved. On the other hand, when the average molecular weight exceeds 100,000, the addition amount dependence on the effect obtained by the alkylene polyalkylene oxide amine polymer, for example, the effect of improving haze becomes too large, which is not preferable.
- the alkylene polyalkylene oxide amine polymer is, for example, 1 ppm or more, 2 ppm or more, 5 ppm or more, or 10 ppm or more, and 5000 ppm or less, based on the mass of the aqueous carrier and all the components dissolved or suspended therein. It may be present in the chemical mechanical polishing composition in an amount of 3000 ppm or less, 1000 ppm or less, or 500 ppm or less.
- the alkylene polyalkylene oxide amine polymer is preferably 1 to 5000 ppm (0.0001 to 0.5% by mass), more preferably 2 to 1000 ppm (0.0002 to 0.1% by mass), and most preferably 5 to 1000 ppm. It may be present in the chemical mechanical polishing composition in an amount of (0.0005-0.1% by weight).
- an alkylene polyalkylene oxide amine polymer can be produced by any method known to those skilled in the art.
- an alkylene polyalkylene oxide amine polymer is an active hydrogen of a polyamine compound having two or more primary amino groups and / or secondary amino groups in the molecule and containing 4 to 100 N atoms. It can be produced by addition polymerization of an alkylene oxide. More specifically, it can be produced by addition polymerization (graft polymerization) of an alkylene oxide to the polyamine compound at 100 to 180 ° C. and 1 to 10 atm under an alkali catalyst.
- the mode of addition polymerization of the alkylene oxide to the polyamine compound is not particularly limited, and when two or more kinds of alkylene oxides are added, the form may be block-shaped or random.
- polyamine compound giving the main chain structure examples include polyethylene polyamines such as triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and hexaethyleneheptamine, and polyalkyleneimines such as polyethyleneimine obtained by polymerization of ethyleneimine. be able to. These compounds may be used alone or in combination of two or more to form a polyamine main chain structure.
- alkylene oxide added to the main chain structure include ethylene oxide, propylene oxide, and butylene oxide. These alkylene oxides may be used alone or in combination of two or more.
- the chemical mechanical polishing composition of the present invention preferably contains a polyoxyalkylene alkyl ether as a surfactant in order to achieve improved POU filter filterability and / or excellent haze properties.
- the polyoxyalkylene alkyl ether may be contained as an alternative to the above-mentioned alkylene polyalkylene oxide amine polymer, or both may be contained, but both may be contained from the viewpoint of improving the filterability and / or haze characteristics of the POU filter. Most preferred.
- polyoxyalkylene alkyl ethers are used in chemical mechanical polishing compositions, they can be used with other surfactants.
- the polyoxyalkylene alkyl ether is represented by the formula (i) RO- (AO) n- H, where R is direct. It is a C 1 to C 15 alkyl group of a chain or a branched chain, A is an alkylene group selected from the group consisting of an ethylene group, a propylene group and a combination thereof, and n represents the average number of moles of AO added. It may contain a polyoxyalkylene alkyl ether having a number of up to 30.
- the R group in the formula (i) has 16 or more carbon atoms, it is possible to reduce the haze on the surface of the base material for a specific polyoxyalkylene alkyl ether.
- such polyoxyalkylene alkyl ethers such as polyoxyethylene cetyl ether or polyoxyethylene stearyl ether are likely to be accumulated in the polishing pad. , It may not be completely removed depending on the pad conditioning etc. performed before each polishing step. Therefore, there is a possibility that polyoxyalkylene alkyl ether is gradually accumulated on the polishing pad as the polishing of the base material is repeated.
- the accumulated polyoxyalkylene alkyl ether reduces the wettability of the base material surface, and in some cases, itself can be a factor causing defects on the base material surface during polishing. Further, when the wettability of the surface of the base material is lowered, shavings and other foreign substances generated by polishing tend to adhere to the base material, and as a result, it may cause defects on the surface of the base material.
- R in the formula (i) is preferably a linear or branched C 1 to C 15 alkyl group, which reduces haze on the surface of the base material and polyoxyalkylene alkyl into the polishing pad.
- R is preferably a linear or branched C 1 to C 13 alkyl group.
- R may be a C 11 to C 15 alkyl group of the branched chain, a C 12 to C 14 alkyl group of the branched chain, or C 13 of the branched chain. It may be an alkyl group (for example, an isotridecyl group).
- a in the formula (i) may be either an ethylene group or a propylene group, or may be any combination of one or more ethylene groups and one or more propylene groups.
- A is an ethylene group or a combination of an ethylene group and a propylene group.
- N in the formula (i) represents the average number of moles of AO added, and may be appropriately determined within the range of, for example, 2 to 30.
- n is preferably a larger value, for example, 5 or more, 6 or more. It may be 8 or more, 10 or more, 11 or more, or 12 or more. Further, n may be 28 or less, for example, 25 or less or 23 or less.
- the average number of moles of AO added refers to the average number of moles of oxyalkylene units contained in 1 mole of polyoxyalkylene alkyl ether.
- polyoxyalkylene alkyl ether examples are not particularly limited, but for example, polyoxyethylene isopropyl ether, polyoxyethylene isobutyl ether, polyoxyethylene sec-butyl ether, polyoxyethylene-t-butyl ether, polyoxyethylene.
- Isopentyl ether polyoxyethylene isohexyl ether, polyoxyethylene heptyl ether, polyoxyethylene isoheptyl ether, polyoxyethylene isooctyl ether, polyoxyethylene isononyl ether, polyoxyethylene isodecyl ether, polyoxyethylene oxypropylene 2-propyl heptyl ether, polyoxyethylene undecyl ether, polyoxyethylene isoundecyl ether, polyoxyethylene lauryl ether, polyoxyethylene isolauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene isotridecyl ether, poly Examples thereof include oxyethylene tetradecyl ether, polyoxyethylene isotetradecyl ether, polyoxyethylene pentadecyl ether, and polyoxyethylene isopentadecyl ether.
- the polyoxyalkylene alkyl ether is at least one of polyoxyethylene isodecyl ether, polyoxyethylene oxypropylene 2-propyl heptyl ether, polyoxyethylene lauryl ether, and polyoxyethylene isotridecyl ether. Most preferably, it contains at least one of polyoxyethylene oxypropylene 2-propyl heptyl ether and polyoxyethylene isotridecyl ether.
- These polyoxyalkylene alkyl ethers may be synthesized by any method known to those skilled in the art or may be commercially available.
- HLB value 20 ⁇ (sum of formulas of hydrophilic part) / (molecular weight)
- the hydrophilic part of the polyoxyalkylene alkyl ether corresponds to the polyoxyalkylene, that is, the n part (AO) in the formula (i)
- the HLB value is the carbon number of the R group and the oxyalkylene (AO). It is clear that it changes depending on the average number of moles added.
- the carbon number of the R group in the formula (i) is the dominant parameter, and therefore the wettability of the base material surface is determined by the HLB value. It doesn't really depend on it. Therefore, the polyoxyalkylene alkyl ether in the present invention can have any suitable HLB value. In general, the HLB value may be appropriately determined within the range of 12 to 18.
- the polyoxyalkylene alkyl ether can have any suitable molecular weight. Although not particularly limited, the polyoxyalkylene alkyl ether can have an average molecular weight of about 100 to about 2,000.
- the polyoxyalkylene alkyl ether is, for example, at 0.01 ppm or more, 0.02 ppm or more, 0.05 ppm or more, or 0.1 ppm or more, based on the mass of the aqueous carrier and all the components dissolved or suspended therein. Yes, and may be present in the chemical mechanical polishing composition in an amount of 5000 ppm or less, 3000 ppm or less, 1000 ppm or less, or 500 ppm or less.
- the polyoxyalkylene alkyl ether is preferably 0.1 to 5000 ppm (0.00001 to 0.5% by mass), more preferably 0.1 to 1000 ppm (0.00001 to 0.1% by mass), and most preferably 0. It may be present in the chemical mechanical polishing composition in an amount of 1 to 500 ppm (0.00001 to 0.05% by weight).
- Aqueous carrier are used to facilitate the application of all components dissolved or suspended in the aqueous carrier to a suitable substrate surface to be polished.
- the aqueous carrier may typically consist of water alone, may contain water and a water-soluble solvent, or may be an emulsion.
- Preferred water-soluble solvents include alcohols such as methanol and ethanol.
- the aqueous carrier is preferably water, more preferably deionized water.
- the chemical mechanical polishing composition of the present invention can have any suitable pH, and the specific pH value may be appropriately determined in consideration of the polishing rate and the like.
- the chemical mechanical polishing composition can have a pH of 7-12, preferably 8-12, more preferably 8.5-12.
- the pH value can be adjusted by adding a pH adjuster as needed.
- the pH regulator may be any alkaline substance and may be the same as or different from the basic components described above.
- the pH regulator is ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, ammonium hydrogencarbonate, ammonium carbonate, potassium hydrogencarbonate, potassium carbonate, sodium hydrogencarbonate, and sodium carbonate.
- the pH adjuster is ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, or tetraethylammonium hydroxide, and most preferably potassium hydroxide.
- the chemical mechanical polishing composition of the present invention may further contain a water-soluble polymer, optionally.
- a water-soluble polymer is not particularly limited, but is selected from the group consisting of, for example, a polymer containing polyvinylpyrrolidone (PVP), polyvinylacetamide, a cellulose derivative (excluding HEC), and a polyvinyl alcohol structural unit. At least one type can be mentioned, and it is preferable to contain a polymer containing a polyvinyl alcohol structural unit.
- the water-soluble polymer (excluding HEC) is determined depending on the type of water-soluble polymer used, and is, for example, 0 based on the mass of the aqueous carrier and all the components dissolved or suspended therein. .1 ppm or more, 1 ppm or more, 2 ppm or more, 5 ppm or more, 10 ppm or more, 20 ppm or more or 50 ppm or more, and present in the chemical mechanical polishing composition in an amount of 5000 ppm or less, 3000 ppm or less, 1000 ppm or less, or 500 ppm or less. Good.
- the water-soluble polymer is preferably 0.1 to 5000 ppm (0.00001 to 0.5% by mass), more preferably 1 to 3000 ppm (0.0001 to 0.3% by mass), and most preferably 2 to 1000 ppm. It may be present in the chemical mechanical polishing composition in an amount of (0.0002 to 0.1% by weight).
- the cellulose derivative When a cellulose derivative is used as the water-soluble polymer in addition to HEC, the cellulose derivative can be selected from methyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, and any combination thereof.
- the chemical mechanical polishing composition in order to utilize the mechanical interaction between the base material and the polishing composition (slurry), polishing is performed by the abrasive contained in the slurry and / or other particles aggregated in the slurry. At this time, nano-polishing defects and continuous surface defects on the substrate such as PID may occur.
- the chemical mechanical polishing composition in order to reduce nano-polishing defects and continuous surface defects on the substrate such as PID, can contain a polymer containing a polyvinyl alcohol structural unit.
- the polymer containing the polyvinyl alcohol structural unit can also function as a wetting agent. Therefore, in the chemical mechanical polishing composition of the present invention, a polymer containing a polyvinyl alcohol structural unit may be used in addition to HEC in order to maintain the surface of the substrate as hydrophilic. Further, the polymer containing the polyvinyl alcohol structural unit is preferably used together with at least one of the above-mentioned alkylene polyalkylene oxide amine polymer and polyoxyalkylene alkyl ether in the polishing composition, and is preferably alkylene poly. More preferably, it is used with both alkylene oxide amine polymers and polyoxyalkylene alkyl ethers. By using the polymer together with these surfactants, the quality of the slurry is better stabilized.
- the polymer containing a polyvinyl alcohol structural unit may be any polymer containing a polyvinyl alcohol structural unit.
- the polymer containing a polyvinyl alcohol structural unit may be simply polyvinyl alcohol, or may contain a polyalkylene oxide such as polyethylene glycol in addition to polyvinyl alcohol.
- the polymer containing a polyvinyl alcohol structural unit may contain, for example, a polyvinyl alcohol structural unit in the main chain or side chain of the polymer, and a part of the polyvinyl alcohol structural unit is further substituted with an acyloxy group. It may be a polymer.
- polymers containing a polyvinyl alcohol structural unit in the main chain of the polymer include a polyvinyl alcohol-polyalkylene oxide graft copolymer containing a polyvinyl alcohol structural unit in the main chain and a polyalkylene oxide structural unit in the side chain.
- the polyalkylene oxide structural unit may include at least one selected from the group consisting of ethylene oxide, propylene oxide and combinations thereof.
- the polyvinyl alcohol structural unit and the polyalkylene oxide structural unit may be present in a molar ratio of, for example, 95: 5 to 60:40 or 90:10 to 70:30.
- R 3 is a hydroxyl group or an acyloxy group represented by R'COO- (in the formula, R'is a C 1 to C 8 alkyl group) (for example, CH 3 COO- group, etc.).
- R 4 is a hydrogen atom or an acyl group represented by R "CO-" (in the formula, R "is a C 1 to C 8 alkyl group) (for example, CH 3 CO- group, etc.).
- a is an integer of 1 to 10,000
- the copolymer of the above general formula may have a structure in which a hydroxyl group and an acyloxy group are mixed for R 3 , and more specifically, a structure in which a part of the acyloxy group is saponified into a hydroxyl group may be used.
- the degree of saponification in this case is not particularly limited, but may be 70 to 100%, 80 to 100%, 90 to 100%, or 95 to 100%.
- the values of M1 and M2 can be appropriately determined according to the abundance ratio of the polyvinyl alcohol structural unit constituting the main chain and the polyethylene oxide structural unit constituting the side chain.
- a is an integer of 1 to 10,000
- M1 and M2 are real numbers of more than 0 mol% and less than 100 mol%, respectively
- M1 + M2 100 mol% of the polyvinyl alcohol-polyethylene oxide graft copolymer.
- the hydroxyl group of the polyvinyl alcohol structural unit constituting the main chain in the above chemical formula is partially substituted with an acyloxy group represented by R'COO- (in the formula, R'is a C 1 to C 8 alkyl group).
- the terminal hydroxyl group of the polyethylene oxide structural unit constituting the side chain in the general formula is an acyl group in which a part thereof is represented by R "CO-" (in the formula, R "is C 1. It may be substituted with ( ⁇ C 8 alkyl group).
- a polymer containing a polyvinyl alcohol structural unit in the side chain of the polymer for example, a polyvinyl alcohol-polyalkylene oxide graft copolymer containing a polyalkylene oxide structural unit in the main chain and a polyvinyl alcohol structural unit in the side chain. Coalescence may be mentioned, and the polyalkylene oxide structural unit may contain at least one selected from the group consisting of ethylene oxide, propylene oxide and combinations thereof. In such a copolymer, the polyvinyl alcohol structural unit and the polyalkylene oxide structural unit may be present in a molar ratio of, for example, 95: 5 to 60:40 or 90:10 to 70:30.
- R 5 is a hydroxyl group or an asyloxy group represented by R'COO- (in the formula, R'is a C 1 to C 8 alkyl group) (for example, CH 3 COO- group, etc.).
- the copolymer of the above general formula may have a structure in which a hydroxyl group and an acyloxy group are mixed for R, and more specifically, a structure in which a part of the acyloxy group is saponified into a hydroxyl group may be used.
- the degree of saponification in this case is not particularly limited, but may be 70 to 100%, 80 to 100%, 90 to 100%, or 95 to 100%.
- the values of N1 and N2 can be appropriately determined according to the abundance ratio of the polyethylene oxide structural unit constituting the main chain and the polyvinyl alcohol structural unit constituting the side chain.
- the hydroxyl group of the polyvinyl alcohol structural unit constituting the side chain in the above chemical formula is partially substituted with an asyloxy group represented by R'COO- (in the formula, R'is a C 1 to C 8 alkyl group). It may have been done.
- the polyvinyl alcohol and polyalkylene oxide have an average of, for example, 1,000 to 10,000,000. It can have a molecular weight.
- the polymer containing the polyvinyl alcohol structural unit is the above-mentioned polyvinyl alcohol-polyethylene oxide graft copolymer
- the polyvinyl alcohol-polyethylene oxide graft copolymer is, for example, 5,000 to 500,000. It can have an average molecular weight of 10,000 to 300,000, or 10,000 to 200,000.
- the polymer containing the polyvinyl alcohol structural unit is, for example, 0.1 ppm or more, 1 ppm or more, 2 ppm or more, or 5 ppm or more, and is based on the mass of the aqueous carrier and all the components dissolved or suspended therein. It may be present in the chemical mechanical polishing composition in an amount of 5000 ppm or less, 3000 ppm or less, 1000 ppm or less, or 500 ppm or less.
- the polymer containing a polyvinyl alcohol structural unit is preferably 0.1 to 5000 ppm (0.00001 to 0.5% by mass), more preferably 1 to 3000 ppm (0.0001 to 0.3% by mass), and most preferably. It may be present in the chemical mechanical polishing composition in an amount of 2 to 1000 ppm (0.0002 to 0.1% by weight).
- the chemical mechanical polishing composition according to the present invention may further contain other additives such as a polishing rate accelerator, a chelating agent and the like, optionally.
- a polishing rate accelerator include hydroxamic acid (for example, acetohydroxamic acid), nitrogen-containing heterocyclic compounds (for example, triazoles such as 1,2,4-triazole), or a combination thereof.
- chelating agents include organic acids such as oxalic acid, citric acid, malonic acid, succinic acid, glutaric acid, adipic acid, tartaric acid and phthalic acid, glycine, serine, proline, leucine, alanine, asparagine and glutamine.
- Examples include amino acids such as valine and lysine, and polyamine complexes such as ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (HEDTA), nitrilotriacetic acid, iminodiacetic acid, and diethylenetriaminetetraacetic acid (DTPA).
- EDTA ethylenediaminetetraacetic acid
- HEDTA hydroxyethylethylenediaminetriacetic acid
- DTPA diethylenetriaminetetraacetic acid
- the chemical mechanical polishing method for the base material of the present invention is The step of contacting the substrate with the polishing pad and the chemical mechanical polishing composition described above, It is characterized by including a step of moving the polishing pad with respect to the base material by placing the chemical mechanical polishing composition between them, and a step of polishing the base material by abrading at least a part of the base material. There is.
- the method of the present invention for chemically mechanically polishing a substrate is particularly suitable for use with a chemical mechanical polishing (CMP) apparatus.
- the device has a platen that moves in use and has a velocity resulting from orbital, linear or circular motion, a polishing pad that comes into contact with the platen and moves with it as the platen moves, and the surface of the polishing pad.
- a carrier that holds the substrate to be polished by contacting and moving against. Polishing of the substrate is performed by contacting the substrate with the polishing pad and the chemical mechanical polishing composition of the present invention, and then moving the polishing pad against the substrate to abrade at least a portion of the substrate to polish the substrate. To polish.
- the substrate can be flattened or polished with a chemical mechanical polishing composition with any suitable polishing pad.
- the base material is not only a silicon base material, but also a silicon base material on which a polysilicon film, a SiO 2 film or a metal wiring film is formed, a sapphire base material, a SiC base material, a GaAs base material, a GaN base material, and a TSV forming material. It may be a base material or the like.
- Suitable polishing pads include, for example, woven and non-woven polishing pads.
- suitable polishing pads can include any suitable polymer of various densities, hardness, thickness, compressibility, repulsive force against compression, and compressibility.
- Suitable polymers include, for example, polyvinyl chloride, polyvinyl fluoride, nylon, carbon fluoride, polycarbonate, polyester, polyacrylate, polyether, polyethylene, polyamide, polyurethane, polystyrene, polypropylene, their co-formed products, and theirs. Can be mentioned.
- a diluted solution and a slurry stock solution are supplied onto the polishing pad.
- it can also be carried out in a method of preparing a slurry for polishing in the vicinity of the polishing pad.
- various chemical mechanical polishing compositions are prepared, and the POU filter filterability of each composition is examined by performing a filter filtration test using diluted ones, and some chemical mechanical polishing compositions are used.
- the material the light point defect (LPD) and the nano-polishing defect of the surface to be polished when the silicon wafer was polished were also investigated.
- polishing Composition of Comparative Example 1 In water, 5.0% by mass colloidal silica (average primary particle size: about 25 nm, average secondary particle size: about 45 nm), 0.20% by mass of ammonia, and 0.28% by mass of HEC (weight average molecular weight). : 250,000) was added to prepare the polishing composition of Comparative Example 1.
- polishing composition of Comparative Example 2 A polishing composition of Comparative Example 2 similar to the polishing composition of Comparative Example 1 was prepared except that the weight average molecular weight of HEC of the polishing composition of Comparative Example 1 was changed from 250,000 to 120,000.
- polishing composition of Comparative Example 3 The components of the polishing composition of Comparative Example 1 were 0.050% by mass of the alkylene polyalkylene oxide amine polymer used in Example 3, 0.005% by mass of polyoxyethylene isotridecyl ether, and 0.010% by mass.
- the polishing composition of Comparative Example 3 was prepared in the same manner as the polishing composition of Comparative Example 1 except that the polyvinyl alcohol-polyethylene oxide graft copolymer was added.
- polishing compositions of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1 below.
- sica size is the average primary particle size of colloidal silica
- HEC Mw is the weight average molecular weight of HEC
- surfactant A is an alkylene polyalkylene oxide amine polymer
- surfactant B is poly. Indicates oxyethylene isotridecyl ether.
- polishing compositions of Examples 4 and 4 to 6 are prepared in the same manner as the polishing compositions of Examples 1 to 3 and Comparative Examples 1 to 3 above.
- the polishing compositions of Example 5 and Comparative Example 7 were prepared.
- Example 3 20 g, and it can be seen that Examples 1 to 3 have excellent POU filter filterability as compared with Comparative Examples 1 to 3. In particular, when the alkylene polyalkylene oxide amine polymer was used, the POU filter filterability was remarkably improved.
- Example 4 in which HEC of Mw of 200,000 or less was used together with the surfactant even when the average primary particle size of the abrasive was 35 nm was 200, It can be seen that the POU filter filterability was improved as compared to Comparative Examples 4-6 with and / or without surfactants with more than 000 Mw of HEC. More specifically, when the filtration amount (throughput) after 600 seconds is compared, it becomes Example 4: 479 g, Comparative Example 4: 18 g, Comparative Example 5: 276 g, Comparative Example 6: 232 g, and Example 4 is Comparative Examples 4 to 6. It can be seen that it has excellent POU filter filterability as compared with.
- Example 5 in which HEC of Mw of 200,000 or less was used together with the surfactant even when the average primary particle size of the abrasive was 15 nm is It can be understood that the POU filter filterability was improved as compared with Comparative Example 7 in which no surfactant was used. More specifically, when the filtration amount (throughput) after 600 seconds is compared, it is Example 5: 199 g and Comparative Example 7: 40 g, and it can be seen that Example 5 has excellent POU filter filterability as compared with Comparative Example 7. ..
- the polishing composition according to the present invention using HEC having a low weight average molecular weight and a surfactant can sufficiently suppress clogging of the filter even though it is a polishing composition containing HEC, and has a small pore size.
- Sufficient POU filter filterability could be achieved when a filter was used.
- the optimum particle size can be selected (used) according to the balance between the desired filtration performance and the polishing performance. For example, when the surface quality of the base material is more important, it is preferable to use one having a small primary particle size.
- polishing composition of Example 3 and the polishing composition of Comparative Example 3 are diluted 20-fold with deionized water, each of the diluted polishing compositions is filtered through the above filter, and then silicon is used using the filtered slurry.
- the substrate of the wafer was chemically mechanically polished (CMP), and the surface quality (light point defect (LPD), nanopolishing defect) of the silicon wafer after polishing was evaluated.
- SC-1 ammonia (29% by mass aqueous solution
- hydrogen peroxide (31% by mass aqueous solution): pure water 1: 4: 20 (volume ratio) solution using SC-200S manufactured by Shibaura Mechatronics.
- a PVA brush at 23 ° C., followed by pure water cleaning.
- LPD light point defects
- DCO dark field composite oblique incident channel
- the polishing composition of Example 3 improved the nano-polishing defect by about 8% and the LPD by about 2% while maintaining the polishing rate at the same level. Therefore, the chemical mechanical polishing composition according to the present invention not only has high POU filter filterability and is highly practical, but can also improve the surface quality of the base material.
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Abstract
Description
(1)
研磨剤、
200,000以下の重量平均分子量を有するヒドロキシエチルセルロース、
塩基性成分、
界面活性剤、及び
水性キャリヤーを含有する、基材を研磨するための化学機械研磨組成物。
(2)
前記ヒドロキシエチルセルロースが150,000以下の重量平均分子量を有する、(1)に記載の化学機械研磨組成物。
(3)
前記研磨剤が50nm以下の一次粒子サイズを有する、(1)又は(2)に記載の化学機械研磨組成物。
(4)
前記研磨剤が20~40nmの一次粒子サイズを有する、(1)又は(2)に記載の化学機械研磨組成物。
(5)
前記界面活性剤が、アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルのうち少なくとも1種を含む、(1)~(4)のいずれか1つに記載の化学機械研磨組成物。
(6)
前記界面活性剤が、アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルの両方を含む、(5)に記載の化学機械研磨組成物。
(7)
前記界面活性剤がアルキレンポリアルキレンオキシドアミン重合体を含み、前記アルキレンポリアルキレンオキシドアミン重合体が、アルキレン基及びポリアルキレンオキシド基がN原子に結合した3級アミンを含む繰り返し構造単位を少なくとも2個含む、(1)~(6)のいずれか1つに記載の化学機械研磨組成物。
(8)
前記界面活性剤がポリオキシアルキレンアルキルエーテルを含み、前記ポリオキシアルキレンアルキルエーテルが、式(i)RO-(AO)n-Hで表され、式中、Rは直鎖又は分岐鎖のC1~C15アルキル基であり、Aはエチレン基、プロピレン基及びそれらの組み合わせからなる群より選択されるアルキレン基であり、nはAOの平均付加モル数を表し、2~30の数である、(1)~(7)のいずれか1つに記載の化学機械研磨組成物。
(9)
ポリビニルアルコール構造単位を含む重合体を含む水溶性高分子をさらに含有する、(1)~(8)のいずれか1つに記載の化学機械研磨組成物。
(10)
前記ポリビニルアルコール構造単位を含む重合体が、主鎖にポリビニルアルコール構造単位を含み、側鎖にポリアルキレンオキシド構造単位を含むポリビニルアルコール-ポリアルキレンオキシドグラフト共重合体、又は、主鎖にポリアルキレンオキシド構造単位を含み、側鎖にポリビニルアルコール構造単位を含むポリビニルアルコール-ポリアルキレンオキシドグラフト共重合体である、(9)に記載の化学機械研磨組成物。
(11)
前記研磨剤が、アルミナ、シリカ、セリア、ジルコニア及びそれらの組み合わせからなる群より選択される、(1)~(10)のいずれか1つに記載の化学機械研磨組成物。
(12)
20~40nmの一次粒子サイズを有するシリカ、
150,000以下の重量平均分子量を有するヒドロキシエチルセルロース、
アンモニア、
アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルのうち少なくとも1種を含む界面活性剤、
ポリビニルアルコール構造単位を含む重合体を含む水溶性高分子、及び
水性キャリヤーを含有する、(1)に記載の化学機械研磨組成物。
(13)
前記基材がシリコン基材である、(1)~(12)のいずれか1つに記載の化学機械研磨組成物。
(14)
基材を研磨パッド及び(1)~(13)のいずれか1つに記載の化学機械研磨組成物と接触させる接触工程、
前記基材に対して前記研磨パッドを前記化学機械研磨組成物をそれらの間に置いて動かす工程、並びに
前記基材の少なくとも一部をすり減らして前記基材を研磨する工程
を含む、基材の化学機械研磨方法。
(15)
前記接触工程の前に、前記化学機械研磨組成物を希釈し、次いで、5μm以下の孔径のフィルタで濾過する工程を含む、(14)に記載の基材の化学機械研磨方法。
本発明の化学機械研磨組成物は、基材を研磨するためのものであり、
研磨剤、
200,000以下の重量平均分子量を有するヒドロキシエチルセルロース、
塩基性成分、
界面活性剤、及び
水性キャリヤーを含有することを特徴としている。
本発明における研磨剤は、シリコンウェハ等の半導体基材の化学機械研磨において当業者に公知の任意の適切な研磨剤であってよい。特に限定されないが、研磨剤は、例えば、アルミナ(例えば、α-アルミナ、γ-アルミナ、δ-アルミナ、及びヒュームドアルミナ)、シリカ(例えば、コロイダルシリカ、沈殿シリカ、ヒュームドシリカ)、セリア、チタニア、ジルコニア、ゲルマニア、マグネシア、それらの共形成された製品、及びそれらの任意の組み合わせからなる群より選択される研磨剤であってよい。好ましくは、研磨剤は、アルミナ、シリカ、セリア、ジルコニア及びそれらの組み合わせからなる群より選択され、より好ましくは、シリカ、特にはコロイダルシリカ又はセリアであり、最も好ましくはコロイダルシリカである。
本発明に係る化学機械研磨組成物において、ヒドロキシエチルセルロース(HEC)は必須の成分である。HECは主に濡れ剤として作用することができる。このような濡れ剤は、シリコンウェハ等の基材の表面を親水性に維持するのに有効である。本発明においては、改善されたPOUフィルタ濾過性を得るために、HECの重量平均分子量(Mw)を低く設定することが重要である。具体的には、本発明におけるHECは200,000以下のMwを有し、好ましくは150,000以下のMwを有し、より好ましくは120,000以下のMwを有する。低MwのHECを、後述する界面活性剤と共に用いることで、研磨組成物が希釈された後において、改善されたPOUフィルタ濾過性を示す化学機械研磨組成物を提供することが可能となる。一方で、HECの分子量が大きくなる(例えば、Mw:250,000)と、特に、研磨組成物が希釈された後の濾過時に、フィルタが目詰まりしてしまい、研磨組成物が十分に濾過されなくなり、POUフィルタ濾過性が悪化する。このような場合、CMPに使用可能なスラリーの歩留まりが顕著に下がり、実用性に欠ける場合がある。さらに、その都度フィルタの洗浄又は交換が必要となり、循環的かつ連続的にスラリーを供給することができず使用上好ましくない。
本発明における塩基性成分は、シリコンウェハ等の半導体基材の表面に化学的に作用して研磨剤による機械研磨を助けることができる。特に限定されないが、塩基性成分は、例えば、アンモニア、水酸化カリウム、水酸化ナトリウム、炭酸アンモニウム、炭酸カリウム、炭酸ナトリウム、メチルアミン、ジメチルアミン、トリメチルアミン、エチルアミン、ジエチルアミン、トリエチルアミン、エチレンジアミン、モノエタノールアミン、N-(β-アミノエチル)エタノールアミン、ヘキサメチレンジアミン、ジエチレントリアミン、トリエチレンテトラミン、テトラエチレンペンタミン、無水ピペラジン、ピペラジン六水和物、1-(2-アミノエチル)ピペラジン、N-メチルピペラジン、及びそれらの任意の組み合わせからなる群より選択される化合物であってよい。好ましくは、塩基性成分は、アンモニア、水酸化カリウム、水酸化ナトリウム、炭酸アンモニウム、炭酸カリウム、及び炭酸ナトリウムからなる群より選択される。より好ましくは、塩基性成分は、アンモニア、水酸化カリウム、又は水酸化ナトリウムであり、最も好ましくはアンモニアである。
本発明における界面活性剤は、本発明に係る化学機械研磨組成物において必須の成分であるが、界面活性剤の種類は、シリコンウェハ等の半導体基材の化学機械研磨において当業者に公知の任意の適切な界面活性剤であってよい。上述した低い重量平均分子量を有するHECと界面活性剤を組み合わせて使用することで、希釈後の研磨組成物のPOUフィルタ濾過性を向上させることができる。一方、界面活性剤を使用しないと、研磨組成物の分散性が十分でなく、低い重量平均分子量を有するHECを使用しても、希釈後の研磨組成物のPOUフィルタ濾過性が不十分になるおそれがある。特に限定されないが、界面活性剤は、典型的に、アニオン性界面活性剤又はノニオン性界面活性剤であることができ、好ましくはノニオン性界面活性剤である。界面活性剤としてノニオン性界面活性剤を用いると、pHの調整が容易になるだけでなく、HECとの相溶性に優れるため好ましい。また、界面活性剤を含有する化学機械研磨組成物を用いてシリコンウェハ等の基材を研磨することで、優れた表面品質(例えばヘイズ)を達成することが可能となる。
本発明の化学機械研磨組成物は、より改善されたPOUフィルタ濾過性及び/又は優れたヘイズ特性を達成するために、界面活性剤としてアルキレンポリアルキレンオキシドアミン重合体を含んでいると好ましい。さらに、本発明の化学機械研磨組成物がアルキレンポリアルキレンオキシドアミン重合体を含む場合、当該アルキレンポリアルキレンオキシドアミン重合体は、アルキレン基及びポリアルキレンオキシド基がN原子に結合した3級アミンを含む繰り返し構造単位を少なくとも2個含むものであるとより好ましい。上記のとおり、本発明に係る化学機械研磨組成物において、当該アルキレンポリアルキレンオキシドアミン重合体を使用することで、より改善されたPOUフィルタ濾過性を得つつ、より高いヘイズの低減効果を達成することが可能となる。当然のことながら、化学機械研磨組成物においてアルキレンポリアルキレンオキシドアミン重合体を使用する場合、他の界面活性剤と共に使用することができる。
本発明の化学機械研磨組成物は、より改善されたPOUフィルタ濾過性及び/又は優れたヘイズ特性を達成するために、界面活性剤として、ポリオキシアルキレンアルキルエーテルを含んでいると好ましい。ポリオキシアルキレンアルキルエーテルは、上述したアルキレンポリアルキレンオキシドアミン重合体の代替として含んでもよく、その両方を含んでもよいが、POUフィルタ濾過性及び/又はヘイズ特性の改善の観点から、両方含むことが最も好ましい。当然のことながら、化学機械研磨組成物においてポリオキシアルキレンアルキルエーテルを使用する場合、他の界面活性剤と共に使用することができる。さらに、本発明の化学機械研磨組成物がポリオキシアルキレンアルキルエーテルを含む場合、当該ポリオキシアルキレンアルキルエーテルは、式(i)RO-(AO)n-Hで表され、式中、Rは直鎖又は分岐鎖のC1~C15アルキル基であり、Aはエチレン基、プロピレン基及びそれらの組み合わせからなる群より選択されるアルキレン基であり、nはAOの平均付加モル数を表し、2~30の数であるポリオキシアルキレンアルキルエーテルを含むものであってもよい。このようなポリオキシアルキレンアルキルエーテルを添加成分として含むことで、POUフィルタ濾過性を改善するだけでなく、当該ポリオキシアルキレンアルキルエーテルを含まない場合と比較して基材表面のヘイズを低減することができ、さらには、当該ポリオキシアルキレンアルキルエーテル等の添加成分が研磨パッド中に蓄積することによって生じ得る基材表面の濡れ性の低下を顕著に又は完全に防ぐことができる。したがって、当該ポリオキシアルキレンアルキルエーテルを含む化学機械研磨組成物を用いた場合、基材表面の濡れ性の低下に起因する表面欠陥の発生を確実に排除することが可能となり、ひいては研磨パッドの寿命を向上させることも可能となる。
HLB値=20×(親水部の式量の総和)/(分子量)
ここで、ポリオキシアルキレンアルキルエーテルの親水部は、ポリオキシアルキレンすなわち式(i)中の(AO)n部に相当することから、HLB値は、R基の炭素数とオキシアルキレン(AO)の平均付加モル数に依存して変化することが明らかである。しかしながら、本発明の効果、とりわけ基材表面の濡れ性の向上については、式(i)中のR基の炭素数が支配的なパラメータであり、このためHLB値によって基材表面の濡れ性が大きく左右されることはない。したがって、本発明におけるポリオキシアルキレンアルキルエーテルは、任意の好適なHLB値を有することができる。一般的には、HLB値は12~18の範囲内において適宜決定すればよい。
水性キャリヤーは、当該水性キャリヤー中に溶解又は懸濁している全成分を研磨されるべき好適な基材表面に適用することを促進するのに用いられる。水性キャリヤーは、典型的には水のみから構成されてもよく、水と水溶性溶剤を含んでもよく、又はエマルジョンであってもよい。好ましい水溶性溶剤としては、アルコール、例えば、メタノール、エタノールなどが挙げられる。水性キャリヤーは、好ましくは水、より好ましくは脱イオン水である。
本発明の化学機械研磨組成物は、HECの他に、任意選択で、水溶性高分子をさらに含んでもよい。このような水溶性高分子としては、特に限定されないが、例えば、ポリビニルピロリドン(PVP)、ポリビニルアセトアミド、セルロース誘導体(ただしHECを除く)及びポリビニルアルコール構造単位を含む重合体からなる群より選択される少なくとも1種を挙げることができ、ポリビニルアルコール構造単位を含む重合体を含むことが好ましい。
HECの他に、水溶性高分子としてセルロース誘導体を使用する場合、当該セルロース誘導体としては、メチルセルロース、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロース、及びそれらの任意の組み合わせから選択することができる。
化学機械研磨においては、基材と研磨組成物(スラリー)との間で機械的な相互作用を利用するため、スラリー中に含まれる研磨剤及び/又はスラリー中で凝集した他のパーティクルなどによって研磨の際にナノ研磨欠陥やPID等の基材上の連続した表面欠陥が発生する場合がある。本発明においては、ナノ研磨欠陥やPID等の基材上の連続した表面欠陥を低減するために、化学機械研磨組成物は、ポリビニルアルコール構造単位を含む重合体を含有することができる。
本発明に係る化学機械研磨組成物は、任意選択で、他の添加剤、例えば、研磨速度促進剤、キレート剤等をさらに含んでもよい。研磨速度促進剤としては、例えば、ヒドロキサム酸(例えばアセトヒドロキサム酸)、窒素含有ヘテロ環式化合物(例えば1,2,4-トリアゾール等のトリアゾール類)又はそれらの組み合わせを挙げることができる。また、キレート剤としては、例えば、シュウ酸、クエン酸、マロン酸、コハク酸、グルタル酸、アジピン酸、酒石酸、フタル酸等の有機酸、グリシン、セリン、プロリン、ロイシン、アラニン、アスパラギン、グルタミン、バリン、リジン等のアミノ酸、及び、エチレンジアミン四酢酸(EDTA)、ヒドロキシエチルエチレンジアミン三酢酸(HEDTA)、ニトリロ三酢酸、イミノ二酢酸、ジエチレントリアミン五酢酸(DTPA)等のポリアミン複合物を挙げることができる。
本発明の基材の化学機械研磨方法は、
基材を研磨パッド及び上で説明した化学機械研磨組成物と接触させる工程、
前記基材に対して前記研磨パッドを前記化学機械研磨組成物をそれらの間に置いて動かす工程、並びに
前記基材の少なくとも一部をすり減らして前記基材を研磨する工程
を含むことを特徴としている。
水に、5.0質量%のコロイダルシリカ(平均一次粒子サイズ:約25nm、平均二次粒子サイズ:約45nm)、0.20質量%のアンモニア、0.28質量%のHEC(重量平均分子量:120,000)、及び0.050質量%のアルキレンポリアルキレンオキシドアミン重合体(エチレンオキシド:プロピレンオキシド=8:2、平均窒素数:5個、分子量=46,000)を添加して、例1の研磨組成物を調製した。
例1の研磨組成物のアルキレンポリアルキレンオキシドアミン重合体を0.005質量%のポリオキシエチレンイソトリデシルエーテル(炭素鎖長:13個、分岐鎖、エチレンオキシド=8個)に変えた以外は、例1の研磨組成物と同様にして例2の研磨組成物を調製した。
例1の研磨組成物に、0.005質量%のポリオキシエチレンイソトリデシルエーテル(炭素鎖長:13個、分岐鎖、エチレンオキシド=8個)と、水溶性高分子として0.010質量%のポリビニルアルコール-ポリエチレンオキサイドグラフト共重合体(80:20mol%、分子量:93,600、ケン化度:98.5%、主鎖:ポリビニルアルコール、側鎖:ポリエチレンオキサイド)とを加えた以外は、例1の研磨組成物と同様にして例3の研磨組成物を調製した。
水に、5.0質量%のコロイダルシリカ(平均一次粒子サイズ:約25nm、平均二次粒子サイズ:約45nm)、0.20質量%のアンモニア、及び0.28質量%のHEC(重量平均分子量:250,000)を添加して、比較例1の研磨組成物を調製した。
比較例1の研磨組成物のHECの重量平均分子量を250,000から120,000に変えた以外は、比較例1の研磨組成物と同様の比較例2の研磨組成物を調製した。
比較例1の研磨組成物の成分に、例3で用いた0.050質量%のアルキレンポリアルキレンオキシドアミン重合体、0.005質量%のポリオキシエチレンイソトリデシルエーテル及び0.010質量%のポリビニルアルコール-ポリエチレンオキサイドグラフト共重合体を加えた以外は、比較例1の研磨組成物と同様にして比較例3の研磨組成物を調製した。
上記の表1~3に記載の各研磨組成物を脱イオン水で20倍希釈して、希釈後の研磨組成物のフィルタ濾過試験を行い、POUフィルタ濾過性を評価した。フィルタは、日本ポール社製の「ウルチポア(登録商標)N66」(直径47mm、定格濾過精度0.2μm)を用い、試験温度:20℃、濾過差圧:100kPa(定圧濾過)の条件で行った。各研磨組成物について、上記条件でフィルタ濾過試験を実施し、濾過を開始してからの時間(秒)を関数とした濾過量(スループット)(g)を調べた。表1~3の各研磨組成物について得られた結果をそれぞれ図1~3に示す。
例3の研磨組成物及び比較例3の研磨組成物を脱イオン水で20倍希釈して、希釈後の各研磨組成物を上記のフィルタで濾過した後、その濾過後のスラリーを用いてシリコンウェハの基材を化学機械研磨(CMP)して、研磨後のシリコンウェハの表面品質(ライトポイント欠陥(LPD)、ナノ研磨欠陥)を評価した。
まず、抵抗率0.1~100Ω・cm及び結晶方位<100>の12インチp型シリコンウェハ(シリコン基材)をフッ化水素酸(0.5%)を用いて23℃で2分間洗浄して自然酸化膜を除去し、次いで、得られたシリコンウェハを、例3の研磨組成物及び比較例3の研磨組成物を純水で20倍希釈(質量比)したスラリーを用いて以下の条件下で化学機械研磨処理した。希釈後のスラリーのpHは水酸化カリウムで約10とした。
(1)CMP装置:12インチ片面研磨機、岡本機械製作所製SPP800S
(2)ウェハヘッド:テンプレート方式
(3)研磨パッド:フジボウ愛媛社製POLYPAS 27NX-PS
(4)定盤回転数:31rpm
(5)研磨ヘッド回転数:33rpm
(6)研磨圧:2.2psi=152g/cm2=15kPa
(7)スラリー供給量:500mL/分(かけ流し)
さらに、研磨後のシリコンウェハのライトポイント欠陥(LPD)の形成について調べた。より具体的には、LPDは、同じくKLA Tencor社製のSurfscan SP2を用い、暗視野コンポジット斜入射チャネル(DCO)におけるLPDの値を用いた。ナノ研磨欠陥は、LPDシグナルよりも強度が低く、表面からの散乱強度がベースライン強度よりも局所的に強いシグナルの量として定義した。設定した領域内において観測された該当するシグナルをカウントして判定した。
Claims (15)
- 研磨剤、
200,000以下の重量平均分子量を有するヒドロキシエチルセルロース、
塩基性成分、
界面活性剤、及び
水性キャリヤーを含有する、基材を研磨するための化学機械研磨組成物。 - 前記ヒドロキシエチルセルロースが150,000以下の重量平均分子量を有する、請求項1に記載の化学機械研磨組成物。
- 前記研磨剤が50nm以下の一次粒子サイズを有する、請求項1又は2に記載の化学機械研磨組成物。
- 前記研磨剤が20~40nmの一次粒子サイズを有する、請求項1又は2に記載の化学機械研磨組成物。
- 前記界面活性剤が、アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルのうち少なくとも1種を含む、請求項1~4のいずれか1項に記載の化学機械研磨組成物。
- 前記界面活性剤が、アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルの両方を含む、請求項5に記載の化学機械研磨組成物。
- 前記界面活性剤がアルキレンポリアルキレンオキシドアミン重合体を含み、前記アルキレンポリアルキレンオキシドアミン重合体が、アルキレン基及びポリアルキレンオキシド基がN原子に結合した3級アミンを含む繰り返し構造単位を少なくとも2個含む、請求項1~6のいずれか1項に記載の化学機械研磨組成物。
- 前記界面活性剤がポリオキシアルキレンアルキルエーテルを含み、前記ポリオキシアルキレンアルキルエーテルが、式(i)RO-(AO)n-Hで表され、式中、Rは直鎖又は分岐鎖のC1~C15アルキル基であり、Aはエチレン基、プロピレン基及びそれらの組み合わせからなる群より選択されるアルキレン基であり、nはAOの平均付加モル数を表し、2~30の数である、請求項1~7のいずれか1項に記載の化学機械研磨組成物。
- ポリビニルアルコール構造単位を含む重合体を含む水溶性高分子をさらに含有する、請求項1~8のいずれか1項に記載の化学機械研磨組成物。
- 前記ポリビニルアルコール構造単位を含む重合体が、主鎖にポリビニルアルコール構造単位を含み、側鎖にポリアルキレンオキシド構造単位を含むポリビニルアルコール-ポリアルキレンオキシドグラフト共重合体、又は、主鎖にポリアルキレンオキシド構造単位を含み、側鎖にポリビニルアルコール構造単位を含むポリビニルアルコール-ポリアルキレンオキシドグラフト共重合体である、請求項9に記載の化学機械研磨組成物。
- 前記研磨剤が、アルミナ、シリカ、セリア、ジルコニア及びそれらの組み合わせからなる群より選択される、請求項1~10のいずれか1項に記載の化学機械研磨組成物。
- 20~40nmの一次粒子サイズを有するシリカ、
150,000以下の重量平均分子量を有するヒドロキシエチルセルロース、
アンモニア、
アルキレンポリアルキレンオキシドアミン重合体及びポリオキシアルキレンアルキルエーテルのうち少なくとも1種を含む界面活性剤、
ポリビニルアルコール構造単位を含む重合体を含む水溶性高分子、及び
水性キャリヤーを含有する、請求項1に記載の化学機械研磨組成物。 - 前記基材がシリコン基材である、請求項1~12のいずれか1項に記載の化学機械研磨組成物。
- 基材を研磨パッド及び請求項1~13のいずれか1項に記載の化学機械研磨組成物と接触させる接触工程、
前記基材に対して前記研磨パッドを前記化学機械研磨組成物をそれらの間に置いて動かす工程、並びに
前記基材の少なくとも一部をすり減らして前記基材を研磨する工程
を含む、基材の化学機械研磨方法。 - 前記接触工程の前に、前記化学機械研磨組成物を希釈し、次いで、5μm以下の孔径のフィルタで濾過する工程を含む、請求項14に記載の基材の化学機械研磨方法。
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| CN115926629B (zh) * | 2022-12-30 | 2023-12-05 | 昂士特科技(深圳)有限公司 | 具有改进再循环性能的化学机械抛光组合物 |
| CN116814168A (zh) * | 2023-06-30 | 2023-09-29 | 昂士特科技(深圳)有限公司 | 用于硅基材质的化学机械抛光组合物及方法 |
| CN121909263A (zh) | 2023-09-25 | 2026-04-21 | 福吉米株式会社 | 研磨用组合物及研磨方法 |
| CN117921517A (zh) * | 2023-12-25 | 2024-04-26 | 杭州中欣晶圆半导体股份有限公司 | 在硅片抛光中搭配使用的抛布和抛液及其使用方法 |
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