WO2014199739A1 - Cmp用研磨液及び研磨方法 - Google Patents
Cmp用研磨液及び研磨方法 Download PDFInfo
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- WO2014199739A1 WO2014199739A1 PCT/JP2014/061847 JP2014061847W WO2014199739A1 WO 2014199739 A1 WO2014199739 A1 WO 2014199739A1 JP 2014061847 W JP2014061847 W JP 2014061847W WO 2014199739 A1 WO2014199739 A1 WO 2014199739A1
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- 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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- 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
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- H10P95/062—
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- H10W10/0143—
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- H10W10/17—
Definitions
- the present invention relates to a polishing liquid for CMP and a polishing method.
- the present invention particularly relates to a polishing liquid used for chemical mechanical polishing (CMP) of a semiconductor wafer material and a polishing method using the same.
- CMP chemical mechanical polishing
- the present invention relates to a polishing liquid for polishing an insulating material such as silicon oxide provided on the surface of a semiconductor wafer, and a polishing method using the same.
- the CMP technique is a technique for flattening the surface after forming a thin film on a substrate by chemical vapor deposition (CVD) or the like.
- CVD chemical vapor deposition
- processing by CMP is indispensable. If the surface of the substrate is uneven, inconveniences such as inability to focus in the exposure process and insufficient formation of a fine wiring structure occur.
- the CMP technology is a process for forming an element isolation region by polishing a plasma oxide material (for example, BPSG, HDP-SiO 2 , p-TEOS), a process for forming an interlayer insulating material, or a silicon oxide in a device manufacturing process.
- the present invention is also applied to a step of flattening a plug (for example, an Al / Cu plug) after embedding a member (for example, a silicon oxide film) containing metal in a metal wiring.
- CMP is usually performed using an apparatus capable of supplying a polishing liquid onto a polishing pad. While supplying the polishing liquid between the substrate surface and the polishing pad, the substrate is pressed against the polishing pad and the substrate surface is polished by moving at least one of the substrate and the polishing pad.
- a high-performance polishing liquid is one of elemental techniques, and various polishing liquids have been developed so far (for example, see Patent Document 1 below).
- a groove is provided in advance on the substrate surface, and an insulating material (for example, silicon oxide) is formed by CVD or the like so as to fill the groove.
- the element isolation region is formed by planarizing the surface of the insulating material by CMP.
- the unnecessary part of the insulating material formed on the substrate should be removed as quickly as possible, and polishing should be stopped reliably with a stopper (a polishing stop layer made of stopper material).
- a stopper a polishing stop layer made of stopper material.
- STI shallow trench isolation
- the polishing process for the insulating material is divided into two stages, and different types of polishing liquids are used in the respective processes, thereby improving the production efficiency.
- the first polishing process rough cutting process
- most of the insulating material is removed using a polishing liquid having a high polishing rate of the insulating material.
- the second polishing step finishing step
- the insulating material is removed until the stopper is exposed, and the polishing surface is finished to be sufficiently flat.
- the present invention is intended to solve the above-mentioned problems, and provides a polishing slurry for CMP that can achieve a high polishing rate of an insulating material and a high stop property of a stopper material (low polishing rate of a stopper material), and An object is to provide a polishing method used.
- the present inventors have intensively studied on additives to be added to the CMP polishing liquid.
- the inventors prepared polishing liquids using various organic compounds as additives, polished the insulating material and stopper material using these polishing liquids, and evaluated the polishing rate.
- the present inventors have found that a combination of three specific types of additives can achieve both a high polishing rate of the insulating material and a high stopping property of the stopper material, thereby completing the present invention. It was.
- the polishing slurry for CMP includes abrasive grains containing a cerium compound, a 4-pyrone compound represented by the following general formula (I), a polymer compound having an aromatic ring and a polyoxyalkylene chain, Contains a cationic polymer and water.
- X 11 , X 12 and X 13 are each independently a hydrogen atom or a monovalent substituent.
- polishing slurry for CMP According to the polishing slurry for CMP according to the present invention, a high polishing rate of the insulating material can be obtained. Moreover, according to the polishing slurry for CMP according to the present invention, it is possible to suppress the polishing rate of the stopper material and to obtain a high stop property of the stopper material. According to such a CMP polishing liquid, the polishing selectivity of the insulating material with respect to the stopper material (polishing speed ratio: polishing speed of the insulating material / polishing speed of the stopper material) can be improved.
- the zeta potential of the abrasive grains in the CMP polishing liquid according to the present invention is preferably positive. Thereby, it becomes easy to achieve a high polishing rate of the insulating material and a high stopping property of the stopper material.
- the 4-pyrone compound includes 3-hydroxy-2-methyl-4-pyrone, 5-hydroxy-2- (hydroxymethyl) -4-pyrone, and 2-ethyl-3-hydroxy-4-pyrone. It is preferably at least one selected from the group. Thereby, it becomes easy to achieve a high polishing rate of the insulating material and a high stopping property of the stopper material.
- the CMP polishing liquid according to the present invention may further contain a saturated monocarboxylic acid. Thereby, the polishing rate of the insulating material can be further improved.
- the carbon number of the saturated monocarboxylic acid is preferably 2-6. Thereby, the polishing rate of the insulating material can be further improved.
- Saturated monocarboxylic acids are acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, pivalic acid, hydroangelic acid, caproic acid, 2-methylpentanoic acid, 4-methylpentanoic acid, 2,3-dimethyl It is preferably at least one selected from the group consisting of butanoic acid, 2-ethylbutanoic acid, 2,2-dimethylbutanoic acid and 3,3-dimethylbutanoic acid. Thereby, the polishing rate of the insulating material can be further improved.
- the polishing liquid for CMP according to the present invention is stored separately as a first liquid and a second liquid, the first liquid includes at least the abrasive grains and water, and the second liquid is the high liquid. It contains at least a molecular compound, the cationic polymer, and water.
- the polishing method according to the present invention includes a step of polishing a substrate containing an insulating material using the polishing liquid. According to such a polishing method, a high polishing rate of the insulating material and a high stop property of the stopper material can be achieved.
- a polishing slurry for CMP that can achieve a high polishing rate of an insulating material (for example, silicon oxide) and a high stop property of a stopper material (for example, polysilicon). Moreover, according to this invention, the grinding
- an insulating material for example, silicon oxide
- a stopper material for example, polysilicon
- a polishing liquid for polishing semiconductor wafer material is provided.
- an application of a polishing liquid for polishing an insulating material is provided.
- application of a polishing liquid for polishing silicon oxide is provided.
- an application of a polishing liquid for selective polishing of an insulating material with respect to a stopper material is provided.
- each component in the composition means the total amount of the plurality of substances present in the composition unless there is a specific notice when there are a plurality of substances corresponding to each component in the composition. .
- the CMP polishing liquid according to this embodiment contains abrasive grains containing a cerium-based compound, at least three types of additives, and water.
- the CMP polishing liquid according to the present embodiment contains a 4-pyrone compound having a specific structure as the first additive, and a polymer having an aromatic ring and a polyoxyalkylene chain as the second additive.
- a compound hereinafter referred to as “aromatic polyoxyalkylene compound”
- a cationic polymer as a third additive.
- the polishing slurry for CMP contains a 4-pyrone compound represented by the following general formula (I) as the first additive. Thereby, the improvement effect of the polishing rate of an insulating material is expressed.
- the 4-pyrone compound has a structure in which a hydroxy group is bonded to at least a carbon atom adjacent to the carbon atom of the carbonyl group.
- the 4-pyrone compound is a heterocyclic ring having a 6-membered ring ( ⁇ -pyrone ring) structure in which an oxy group and a carbonyl group are included and the carbonyl group is located at the 4-position with respect to the oxy group.
- a hydroxy group is bonded to a carbon atom adjacent to the carbonyl group in the ⁇ -pyrone ring, and a hydrogen atom or a hydrogen atom is attached to the other carbon atom. Substituents other than may be substituted.
- X 11 , X 12 and X 13 are each independently a hydrogen atom or a monovalent substituent.
- Examples of monovalent substituents include aldehyde groups, hydroxy groups, carboxyl groups, sulfonic acid groups, phosphoric acid groups, bromine, chlorine, iodine, fluorine, nitro groups, hydrazine groups, and alkyl groups having 1 to 8 carbon atoms (OH, COOH, Br, Cl, I or NO 2 may be substituted), a hydroxyalkyl group, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 1 to 8 carbon atoms, and the like.
- a methyl group, an ethyl group, or a hydroxymethyl group is preferable.
- the substituent is preferably bonded to a carbon atom adjacent to the oxy group from the viewpoint of easy synthesis. That is, X 11 and / or X 12 are preferably a substituent. Further, from the viewpoint of easily obtaining the effect of improving the polishing ability of the abrasive grains containing the cerium compound, at least two of X 11 , X 12 and X 13 are preferably hydrogen atoms, and X 11 , X 12 and More preferably, two of X 13 are hydrogen atoms.
- 4-pyrone compounds include 3-hydroxy-2-methyl-4-pyrone (also known as 3-hydroxy-2-methyl-4H-pyran-4-one), 5-hydroxy-2- (hydroxymethyl)- 4-pyrone (also known as 5-hydroxy-2- (hydroxymethyl) -4H-pyran-4-one) and 2-ethyl-3-hydroxy-4-pyrone (also known as 2-ethyl-3-hydroxy-) 4H-pyran-4-one) is preferably at least one selected from the group consisting of As the 4-pyrone compound, one kind may be used alone, or two or more kinds may be used in combination.
- the 4-pyrone compound is preferably water-soluble.
- a compound having a high solubility in water it is possible to dissolve a desired amount of additive in the polishing liquid satisfactorily, improving the polishing rate, and suppressing the aggregation of abrasive grains. Even higher levels can be obtained.
- the solubility of the 4-pyrone compound in 100 g of water at normal temperature (25 ° C.) is preferably 0.001 g or more, more preferably 0.005 g or more, still more preferably 0.01 g or more, and particularly preferably 0.05 g or more.
- the upper limit of solubility is not particularly limited.
- the content of the first additive is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, still more preferably 0.03% by mass or more, based on the total mass of the polishing slurry for CMP. 0.04% by mass or more is particularly preferable, and 0.05% by mass or more is very preferable.
- the content of the first additive is preferably 5% by mass or less, more preferably 1% by mass or less, still more preferably 0.5% by mass or less, and more preferably 0.1% by mass based on the total mass of the polishing slurry for CMP.
- the content of the first additive is 5% by mass or less, compared to a case where the content exceeds 5% by mass, agglomeration of abrasive grains is easily suppressed, and a high polishing rate is easily achieved.
- the aromatic polyoxyalkylene compound has an effect of suppressing an excessive increase in the polishing rate of the stopper material. The reason why this effect occurs is presumed that the polishing of the stopper material is suppressed when the aromatic polyoxyalkylene compound covers the stopper material. Such an effect is remarkably obtained when the stopper material is polysilicon.
- An aromatic polyoxyalkylene compound is a compound in which a substituent having an aromatic ring is introduced at the terminal of polyoxyalkylene.
- the aromatic ring may or may not be directly bonded to the polyoxyalkylene chain.
- the aromatic ring may be monocyclic or polycyclic.
- the aromatic polyoxyalkylene compound may have a structure in which a plurality of polyoxyalkylene chains are bonded via a substituent having an aromatic ring.
- the polyoxyalkylene chain is preferably a polyoxyethylene chain, a polyoxypropylene chain, or a polyoxyethylene-polyoxypropylene chain from the viewpoint of easy synthesis.
- the number of structural units of the polyoxyalkylene chain (the number of structural units of the oxyalkylene structure) is preferably 15 or more from the viewpoint of efficiently covering the stopper material.
- Examples of the substituent having an aromatic ring include an aryl group when the aromatic ring is located at the end of the aromatic polyoxyalkylene compound.
- Examples of the aryl group include monocyclic aromatic groups such as a phenyl group, benzyl group, tolyl group, and xylyl group; polycyclic aromatic groups such as a naphthyl group, and these aromatic groups further have a substituent. May be.
- Examples of substituents introduced into aromatic groups include alkyl groups, vinyl groups, allyl groups, alkenyl groups, alkynyl groups, alkoxy groups, halogeno groups, hydroxy groups, carbonyl groups, nitro groups, amino groups, styrene groups, and aromatic groups. In view of efficiently covering the stopper material, an alkyl group and a styrene group are preferable.
- Examples of the substituent having an aromatic ring include an arylene group when the aromatic ring is located in the main chain of the aromatic polyoxyalkylene compound.
- Examples of the arylene group include monocyclic aromatic groups such as a phenylene group, a tolylene group, and a xylylene group; polycyclic aromatic groups such as a naphthylene group, and these aromatic groups may further have a substituent.
- Examples of substituents introduced into aromatic groups include alkyl groups, vinyl groups, allyl groups, alkenyl groups, alkynyl groups, alkoxy groups, halogeno groups, hydroxy groups, carbonyl groups, nitro groups, amino groups, styrene groups, and aromatic groups. Groups and the like.
- the aromatic polyoxyalkylene compound is preferably a compound represented by the following general formula (II) or general formula (III) from the viewpoint of efficiently covering the stopper material.
- R 11 —O— (R 12 —O) m —H (II) [In the formula (II), R 11 represents an aryl group which may have a substituent, R 12 represents an alkylene group having 1 to 5 carbon atoms which may have a substituent, m Represents an integer of 15 or more.
- R 21 and R 22 each independently represents an arylene group which may have a substituent
- R 23 , R 24 and R 25 each independently have a substituent.
- n1 and n2 each independently represents an integer of 15 or more.
- the formula (II) or the formula (III) satisfy at least one of the following conditions.
- R 12 , R 23 , R 24 and R 25 are preferably an ethylene group or an n-propylene group.
- -M is preferably 15 or more, and more preferably 30 or more.
- -M is preferably 20000 or less, more preferably 10,000 or less, still more preferably 5000 or less, and particularly preferably 1000 or less.
- -As for n1 and n2, 15 or more are preferable and 30 or more are more preferable.
- -N1 and n2 are preferably 20000 or less, more preferably 10,000 or less, still more preferably 5000 or less, and particularly preferably 1000 or less.
- Examples of the aromatic polyoxyalkylene compound represented by the formula (II) include polyoxyalkylene phenyl ether, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene styrenated phenyl ether, polyoxyalkylene cumyl phenyl ether, And polyoxyalkylene benzyl ether.
- examples of the aromatic polyoxyalkylene compound represented by the formula (II) include polyoxyethylene alkylphenyl ether (for example, Emulgit series manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), polyoxyethylene nonylpropenyl phenyl.
- Ether for example, Dairon Kogyo Seiyaku Co., Ltd., Aqualon RN series
- polyoxyethylene phenyl ether for example, polyoxyethylene styrenated phenyl ether (for example, Kao Corporation, Emulgen A-500; Daiichi Kogyo Seiyaku Co., Ltd.) Neugen EA-7 series
- polyoxypropylene phenyl ether for example, polyoxyethylene cumylphenyl ether, polyoxyethylene benzyl ether and the like.
- aromatic polyoxyalkylene compound represented by the formula (III) include 2,2-bis (4-polyoxyethyleneoxyphenyl) propane.
- the aromatic polyoxyalkylene compound can be used alone or in combination of two or more for the purpose of adjusting polishing properties such as polishing selectivity and flatness.
- the lower limit of the weight average molecular weight of the aromatic polyoxyalkylene compound is preferably 1000 or more, more preferably 1500 or more, still more preferably 2000 or more, and particularly preferably 4000 or more, from the viewpoint of further excellent polishing selectivity.
- the upper limit of the weight average molecular weight of the aromatic polyoxyalkylene compound is preferably 1000000 or less, more preferably 500000 or less, still more preferably 250,000 or less, particularly preferably 100000 or less, and particularly preferably 50000 or less, from the viewpoint of further excellent polishing selectivity.
- 10,000 or less is very preferable.
- the weight average molecular weight of an aromatic polyoxyalkylene compound can be measured on condition of the following by the gel permeation chromatography method (GPC) using the calibration curve of a standard polystyrene, for example.
- GPC gel permeation chromatography method
- Equipment used Hitachi L-6000 (made by Hitachi, Ltd.) Column: Gel pack GL-R420 + Gel pack GL-R430 + Gel pack GL-R440 [trade name, total 3 manufactured by Hitachi Chemical Co., Ltd.]
- the content of the aromatic polyoxyalkylene compound is preferably 0.01% by mass or more based on the total mass of the polishing slurry for CMP. Thereby, the polishing rate of the stopper material can be further suppressed.
- the lower limit of the content of the aromatic polyoxyalkylene compound is more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, based on the total mass of the CMP polishing liquid. 2% by mass or more is particularly preferable.
- the upper limit of the content of the aromatic polyoxyalkylene compound is not particularly limited, but is preferably 10.0% by mass or less, more preferably 5.0% by mass or less from the viewpoint of excellent stability and productivity. 0 mass% or less is still more preferable, 2.0 mass% or less is especially preferable, and 1.0 mass% or less is very preferable.
- the polishing slurry for CMP includes a positive additive as a third additive in addition to the first additive (4-pyrone compound) and the second additive (aromatic polyoxyalkylene compound). Contains an ionic polymer. That is, as the third additive, a compound corresponding to the first additive or the second additive is excluded.
- a “cationic polymer” is defined as a polymer having a cationic group or a group that can be ionized into a cationic group in the main chain or side chain. Examples of the cationic group include an amino group, an imino group, and a cyano group.
- the cationic polymer has the effect of suppressing an excessive increase in the polishing rate of the stopper material when used in combination with an aromatic polyoxyalkylene compound.
- the cationic polymer can suppress the decrease in the polishing rate of the insulating material due to the aromatic polyoxyalkylene compound being excessively coated with the insulating material in addition to the stopper material. There is also an effect to improve. Therefore, when the aromatic polyoxyalkylene compound and the cationic polymer are used in combination, the cationic polymer interacts with the aromatic polyoxyalkylene compound, thereby suppressing the polishing rate of the stopper material, It is considered that the polishing rate of the insulating material can be improved.
- Examples of the cationic polymer include polymers obtained by polymerizing at least one monomer component selected from the group consisting of allylamine, diallylamine, vinylamine, ethyleneimine, and derivatives thereof (allylamine polymer, diallylamine polymer). , Vinylamine polymers, ethyleneimine polymers), polysaccharides such as chitosan and chitosan derivatives, and the like.
- the allylamine polymer is a polymer obtained by polymerizing allylamine or a derivative thereof.
- the allylamine derivative include alkoxycarbonylated allylamine, methylcarbonylated allylamine, aminocarbonylated allylamine, ureated allylamine and the like.
- the diallylamine polymer is a polymer obtained by polymerizing diallylamine or a derivative thereof.
- diallylamine derivatives include methyl diallylamine, diallyldimethylammonium salt, diallylmethylethylammonium salt, acylated diallylamine, aminocarbonylated diallylamine, alkoxycarbonylated diallylamine, aminothiocarbonylated diallylamine, hydroxyalkylated diallylamine, and the like.
- the ammonium salt include ammonium chloride and ammonium alkyl sulfate (for example, ammonium ethyl sulfate).
- the vinylamine polymer is a polymer obtained by polymerizing vinylamine or a derivative thereof.
- the vinylamine derivative include alkylated vinylamine, amidated vinylamine, ethylene oxideated vinylamine, propylene oxided vinylamine, alkoxylated vinylamine, carboxymethylated vinylamine, acylated vinylamine, and ureaated vinylamine.
- the ethyleneimine polymer is a polymer obtained by polymerizing ethyleneimine or a derivative thereof.
- the ethyleneimine derivative include aminoethylated acrylic polymer, alkylated ethyleneimine, ureaated ethyleneimine, propylene oxideated ethyleneimine and the like.
- the cationic polymer may have structural units derived from monomer components other than allylamine, diallylamine, vinylamine, ethyleneimine, and derivatives thereof.
- the cationic polymer may have a structural unit derived from, for example, acrylamide, dimethylacrylamide, diethylacrylamide, hydroxyethylacrylamide, acrylic acid, methyl acrylate, methacrylic acid, maleic acid or sulfur dioxide.
- the cationic polymer may be a homopolymer of allylamine, diallylamine, vinylamine, ethyleneimine (polyallylamine, polydiallylamine, polyvinylamine, polyethyleneimine), and is derived from allylamine, diallylamine, vinylamine, ethyleneimine or derivatives thereof.
- a copolymer having the following structural unit may also be used. In the copolymer, the arrangement of structural units is arbitrary.
- a form of block copolymer in which the same type of structural units are continuous (b) a form of random copolymerization in which the structural units A and B are particularly ordered, (c) structural units A and structural units Any form such as an alternating copolymerization form in which B is alternately arranged may be employed.
- the copolymer is preferably a copolymer obtained by polymerizing a composition containing acrylamide as a monomer component from the viewpoint of further improving the polishing selectivity of the insulating material with respect to the stopper material, and diallyldimethylammonium salt.
- a copolymer obtained by polymerizing a composition containing acrylamide as a monomer component is more preferable, and a diallyldimethylammonium chloride / acrylamide copolymer is more preferable.
- cationic polymers from the viewpoint of further improving the polishing selectivity of the insulating material with respect to the stopper material and from the viewpoint of further improving the polishing speed of the insulating material, an amine polymer which is a polymer such as allylamine, diallylamine, vinylamine is used. preferable.
- the cationic polymer can be used alone or in combination of two or more for the purpose of adjusting polishing characteristics such as polishing selectivity and flatness.
- the lower limit of the weight average molecular weight of the cationic polymer is preferably 100 or more, more preferably 300 or more, and even more preferably 500 or more from the viewpoint of further improving the polishing selectivity of the insulating material with respect to the stopper material.
- the upper limit of the weight average molecular weight of the cationic polymer is preferably 1000000 or less, more preferably 600000 or less, and even more preferably 300000 or less, from the viewpoint of further improving the polishing selectivity of the insulating material with respect to the stopper material.
- the weight average molecular weight of the cationic polymer can be measured by the same method as the weight average molecular weight of the second additive.
- the lower limit of the content of the cationic polymer is preferably 0.00001% by mass or more based on the total mass of the polishing slurry for CMP, and 0.00003% by mass or more. More preferred is 0.00005% by mass or more.
- the upper limit of the content of the cationic polymer is preferably 5% by mass or less, more preferably 1% by mass or less, more preferably 0.1% by mass, based on the total mass of the polishing slurry for CMP, from the viewpoint of further excellent polishing selectivity.
- the following is more preferable, 0.01% by mass or less is particularly preferable, 0.005% by mass or less is very preferable, 0.001% by mass or less is very preferable, and 0.0005% by mass or less is particularly preferable.
- the content of the cationic polymer depends on the insulating material production method (type and filming conditions) from the viewpoint of further improving the polishing speed of the insulating material, the polishing selectivity of the insulating material with respect to the stopper material, and the flatness. It is preferable to adjust appropriately.
- the CMP polishing liquid according to this embodiment may further contain a saturated monocarboxylic acid as a fourth additive. Thereby, the polishing rate of the insulating material can be further improved.
- the saturated monocarboxylic acid preferably has 2 to 6 carbon atoms.
- saturated monocarboxylic acids include acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, pivalic acid, hydroangelic acid, caproic acid, 2-methylpentanoic acid, 4-methylpentanoic acid, 2,3- Preference is given to at least one selected from the group consisting of dimethylbutanoic acid, 2-ethylbutanoic acid, 2,2-dimethylbutanoic acid and 3,3-dimethylbutanoic acid.
- saturated monocarboxylic acid one type of these compounds may be used alone, or two or more types may be used in combination.
- the number of carbon atoms of the saturated monocarboxylic acid is more preferably 3 or more from the viewpoint of further improving the polishing rate of the insulating material.
- a saturated monocarboxylic acid having 2 or 3 carbon atoms is preferred from the viewpoint of good water solubility, ease of use, and low cost and availability, and specifically, acetic acid and propionic acid are preferred. From the above, propionic acid is particularly preferable in terms of balancing the polishing rate, water solubility, availability, and the like.
- the content of the saturated monocarboxylic acid is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, still more preferably 0.01% by mass or more, based on the total mass of the polishing slurry for CMP.
- 02 mass% or more is especially preferable, 0.03 mass% or more is very preferable, and 0.05 mass% or more is very preferable.
- the content of the saturated monocarboxylic acid is 0.001% by mass or more, the effect of the saturated monocarboxylic acid that achieves a stable polishing rate and good in-plane uniformity is easily obtained.
- the content of the saturated monocarboxylic acid is preferably 5% by mass or less, more preferably 1% by mass or less, still more preferably 0.5% by mass or less, and further preferably 0.3% by mass or less based on the total mass of the polishing slurry for CMP. Is particularly preferable, and 0.1% by mass or less is extremely preferable.
- the content of the saturated monocarboxylic acid is 5% by mass or less, it is easy to suppress the aggregation of abrasive grains as compared with the case of exceeding 5% by mass, and a high polishing rate and good in-plane uniformity are easily achieved.
- the CMP polishing liquid according to this embodiment contains abrasive grains containing a cerium compound.
- a polishing liquid using abrasive grains containing a cerium-based compound has a feature that relatively few polishing scratches are generated on the polishing surface.
- a polishing liquid containing silica particles as abrasive grains has been widely used because it is easy to achieve a high polishing rate of an insulating material.
- the polishing liquid using silica particles generally has a problem that polishing scratches are likely to occur on the polishing surface. In a device having a fine pattern with a wiring width of 45 nm or later, even a fine scratch that has not been a problem may affect the reliability of the device.
- the polishing liquid using abrasive grains containing a cerium-based compound has a tendency that the polishing rate of the insulating material is slightly lower than that using silica particles.
- a high polishing rate of the insulating material is achieved by using the above-described additive in combination with abrasive grains containing a cerium compound. This suggests that the combination of the cerium compound and the additive is particularly effective for polishing.
- cerium compound examples include cerium oxide, cerium hydroxide, ammonium cerium nitrate, cerium acetate, cerium sulfate hydrate, cerium bromate, cerium bromide, cerium chloride, cerium oxalate, cerium nitrate, and cerium carbonate.
- cerium oxide is preferable. By using abrasive grains containing cerium oxide, a higher polishing rate can be achieved, and a polished surface with few scratches and excellent flatness can be obtained.
- the cerium oxide used as the abrasive grains preferably contains polycrystalline cerium oxide having a crystal grain boundary.
- the polycrystalline cerium oxide particles having such a structure are different from simple aggregates in which single crystal particles are aggregated, and become fine due to stress during polishing, and at the same time, have an active surface (a surface not exposed to the outside before becoming fine). Since it appears one after another, it is considered that the high polishing rate of the insulating material can be maintained at a high level.
- Such polycrystalline cerium oxide particles are described in detail in International Publication No. WO99 / 31195.
- a method of firing a cerium source such as cerium carbonate is preferred.
- the firing temperature is preferably 350 to 900 ° C.
- the produced cerium oxide particles are aggregated, it is preferably mechanically pulverized.
- the pulverization method is not particularly limited, but for example, dry pulverization using a jet mill or the like, and wet pulverization using a planetary bead mill or the like are preferable.
- the jet mill for example, those described in “Chemical Engineering Journal”, Vol. 6 No. 5 (1980), pages 527 to 532 can be used.
- the average particle size of the abrasive grains is preferably 50 nm or more, more preferably 70 nm or more, and still more preferably 80 nm or more.
- the polishing rate of the insulating material can be further improved as compared to the case of less than 50 nm.
- the average particle size of the abrasive grains is preferably 500 nm or less, more preferably 300 nm or less, still more preferably 280 nm or less, particularly preferably 250 nm or less, and extremely preferably 200 nm or less.
- the average particle size of the abrasive grains is 500 nm or less, polishing flaws can be suppressed as compared with the case where the average particle size exceeds 500 nm.
- the above-mentioned “average particle diameter of abrasive grains” means the median value of volume distribution obtained by measuring a slurry sample in which abrasive grains are dispersed using a dynamic light scattering particle size distribution meter. Specifically, it is a value measured using LB-500 (trade name) manufactured by HORIBA, Ltd. The content of the slurry sample is adjusted so that the content of the abrasive grains is 0.5% by mass based on the total mass of the slurry sample, and this is set in LB-500, and the median of the volume distribution is measured. The degree of agglomeration of abrasive grains can also be evaluated by measuring the median diameter (cumulative median value) with LB-500.
- the content of the abrasive grains is 0.5% by mass based on the total mass of the slurry sample by concentrating or diluting the polishing liquid with water. After adjusting the content of the slurry sample, it can be measured by the same method.
- the zeta potential of the abrasive grains in the CMP polishing liquid is preferably positive.
- Zero potential means the surface charge of the abrasive grains dispersed in the CMP polishing liquid.
- the zeta potential of the abrasive grains in the CMP polishing liquid is preferably +10 mV or more, more preferably +20 mV or more, and further preferably +30 mV or more from the viewpoint of easily stabilizing the dispersed state of the abrasive grains.
- the upper limit of the zeta potential is not particularly limited, but is about +100 mV.
- the zeta potential can be measured using, for example, Delsa Nano C manufactured by BECKMAN COULTER.
- the water used for preparing the polishing liquid is not particularly limited, but deionized water, ion exchange water, ultrapure water, and the like are preferable. In addition, you may use polar solvents, such as ethanol, acetic acid, and acetone, together with water as needed.
- the CMP polishing liquid according to this embodiment may contain a surfactant from the viewpoint of improving the dispersion stability of the abrasive grains and / or the flatness of the polished surface.
- a surfactant examples include an ionic surfactant and a nonionic surfactant, and a nonionic surfactant is preferable.
- One type of surfactant may be used alone, or two or more types may be used in combination.
- Nonionic surfactants include polyoxypropylene polyoxyethylene alkyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene polyoxypropylene ether derivatives, polyoxypropylene glyceryl ether, polyethylene glycol, methoxy Ether type surfactants such as polyethylene glycol and oxyethylene adducts of acetylenic diols; Ester type surfactants such as sorbitan fatty acid ester and glycerol borate fatty acid ester; Amino ether type surfactants such as polyoxyethylene alkylamines; Ether ester type surfactants such as polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerol borate fatty acid ester, polyoxyethylene alkyl ester; Alkanolamide-type surfactants such as fatty acid alkanolamides and polyoxyethylene fatty acid alkanolamides; Examples thereof include oxyethylene adducts
- the CMP polishing liquid according to this embodiment may further contain other components in addition to the surfactant in accordance with desired characteristics.
- examples of such components include pH adjusters as described later, pH buffering agents for suppressing fluctuations in pH, aminocarboxylic acids, and cyclic monocarboxylic acids. It is desirable that the content of these components be in a range that does not excessively reduce the effect of the CMP polishing liquid.
- the lower limit of the pH of the polishing slurry for CMP according to this embodiment is preferably 1.0 or more, more preferably 2.0 or more, and even more preferably 3.0 or more, from the viewpoint of easily maintaining a high polishing rate of the insulating material.
- the upper limit of the pH of the CMP polishing liquid according to this embodiment is preferably 9.0 or less, more preferably 8.0 or less, and even more preferably 7.0 or less, from the viewpoint of easily stabilizing the dispersed state of the abrasive grains. 6.0 or less is particularly preferable.
- the pH is defined as the pH at a liquid temperature of 25 ° C.
- the pH of the polishing liquid can be adjusted by a pH adjusting agent such as an acid component such as an inorganic acid or an organic acid; an alkali component such as ammonia, sodium hydroxide, tetramethylammonium hydroxide (TMAH), or imidazole.
- a buffer may be added to stabilize the pH.
- you may add a buffer as a buffer (liquid containing a buffer). Examples of such a buffer include acetate buffer and phthalate buffer.
- the pH of the CMP polishing liquid according to the present embodiment can be measured with a pH meter (for example, model number PHL-40 manufactured by Electrochemical Instrument Co., Ltd.).
- a pH meter for example, model number PHL-40 manufactured by Electrochemical Instrument Co., Ltd.
- two pH meters are calibrated using phthalate pH buffer solution (pH 4.01) and neutral phosphate pH buffer solution (pH 6.86) as standard buffers, and then the electrodes of the pH meter are polished. Put in the solution and measure the value after 2 minutes or more has stabilized. At this time, both the standard buffer solution and the polishing solution are set to 25 ° C.
- the polishing slurry for CMP is a one-part type containing at least abrasive grains, a 4-pyrone compound, a polymer compound having an aromatic ring and a polyoxyalkylene chain, a cationic polymer, and water.
- the slurry may be stored as a polishing liquid, and the constituents of the polishing liquid are mixed into the slurry and the additive liquid so that the slurry (first liquid) and the additive liquid (second liquid) are mixed to become the polishing liquid.
- the slurry includes at least abrasive grains and water, for example.
- the additive liquid contains, for example, at least a polymer compound having an aromatic ring and a polyoxyalkylene chain, a cationic polymer, and water.
- the constituents of the polishing liquid may be stored as a polishing liquid set divided into three or more liquids.
- the 4-pyrone compound and the saturated monocarboxylic acid may be contained in either the slurry or the additive solution, but are preferably contained in the slurry.
- a slurry containing at least abrasive grains, a 4-pyrone-based compound (saturated monocarboxylic acid if necessary) and water, a polymer compound having an aromatic ring and a polyoxyalkylene chain, a cationic polymer, and water It is preferable to divide into additive liquids. Thereby, for example, a first polishing process described later is performed only with the slurry, and a second polishing process described later is performed with a CMP polishing liquid obtained by mixing the slurry and the additive liquid. It becomes possible.
- the one-part polishing liquid may be stored as a polishing liquid storage liquid with a reduced water content, and may be diluted with water during polishing.
- the two-part polishing liquid set may be stored as a slurry storage liquid and an additive liquid storage liquid with a reduced water content, and may be diluted with water during polishing.
- a method of supplying the polishing liquid onto the polishing surface plate a method of directly supplying the polishing liquid and supplying it; a storage liquid for polishing liquid and water are supplied through separate pipes; A method in which these are combined and mixed and supplied; a method in which a stock solution for polishing liquid and water are mixed and supplied in advance can be used.
- the polishing rate can be adjusted by arbitrarily changing the combination of these two components.
- the slurry and the additive liquid are sent through separate pipes, and these pipes are combined, mixed and supplied; the slurry storage liquid, the additive liquid storage liquid and water are sent through separate pipes, A method in which these are combined and mixed and supplied; a method in which slurry and additive solution are mixed and supplied in advance; and a method in which slurry storage solution, additive solution storage solution and water are mixed in advance and supplied it can.
- the surface to be polished is polished using a polishing liquid obtained by mixing the slurry and the additive liquid on the polishing surface plate.
- the polishing method includes a polishing step of polishing a substrate (for example, a substrate) containing an insulating material using the CMP polishing liquid.
- a substrate for example, a substrate
- polishing step the insulating material is pressed against the polishing pad and at least one of the base and the polishing pad is moved while supplying the polishing liquid between the insulating material and the polishing pad.
- Polish for example, a polishing liquid whose content and pH of each component are adjusted is used, and a substrate having an insulating material on the surface is planarized by a CMP technique.
- the polishing method according to this embodiment is suitable for polishing a substrate having an insulating material on the surface in the device manufacturing process.
- Devices include diodes, transistors, compound semiconductors, thermistors, varistors, individual semiconductors such as thyristors, DRAM (dynamic random access memory), SRAM (static random access memory), EPROM (erasable programmable read) ⁇ Only memory), mask ROM (mask read only memory), EEPROM (electrically erasable programmable read only memory), storage devices such as flash memory, theoretical circuit such as microprocessor, DSP, ASIC, etc.
- Devices integrated circuit devices such as compound semiconductors represented by MMIC (monolithic microwave integrated circuit), hybrid integrated circuits (hybrid IC), light emitting diodes, charge coupled devices, etc. Such as photoelectric conversion elements and the like.
- the CMP polishing liquid according to the present embodiment can achieve a high polishing rate of the insulating material without largely depending on the state of the surface to be polished. Therefore, the polishing method using the polishing liquid is difficult to achieve a high polishing rate by the conventional method using the CMP polishing liquid, and can be applied to a substrate.
- the polishing method according to the present embodiment is particularly suitable for flattening a surface to be polished having a step (unevenness) on the surface.
- the substrate having such a surface to be polished include a semiconductor device for logic.
- this polishing method is suitable for polishing a surface including a portion in which a concave portion or a convex portion is a T-shape or a lattice shape when viewed from above.
- an insulating material provided on the surface of a semiconductor device having memory cells (for example, DRAM, flash memory) can be polished at a high speed.
- the CMP polishing liquid according to the present embodiment greatly depends on the uneven shape of the surface to be polished. It is shown that a high polishing rate can be achieved without doing so.
- the polishing method according to the present embodiment is suitable for a polishing method in which the insulating material is polished and the polishing is stopped when the stopper is exposed. This is because the CMP polishing liquid can achieve a high polishing rate of the insulating material and a high stopping property of the stopper material.
- the insulating material can be selectively polished with respect to the stopper material.
- the polishing rate ratio of the insulating material to the stopper material is preferably 30 or more, more preferably 50 or more, and still more preferably 100 or more.
- Examples of the insulating material include inorganic insulating materials and organic insulating materials.
- Examples of inorganic insulating materials include silicon-based insulating materials.
- Examples of the silicon-based insulating material include silicon-based materials such as silicon oxide, fluorosilicate glass, organosilicate glass, silsesquioxane hydride, silicon carbide, and silicon nitride.
- the insulating material may be doped with an element such as phosphorus or boron.
- Examples of the organic insulating material include wholly aromatic low dielectric constant insulating materials.
- the insulating material is preferably an inorganic insulating material, more preferably a silicon-based insulating material, and still more preferably silicon oxide from the viewpoint of achieving a higher polishing rate.
- the stopper material constituting the stopper includes, for example, silicon nitride, polysilicon and the like, and polysilicon is preferable from the viewpoint of achieving higher stop performance.
- the substrate to which the polishing method can be applied is not limited to one in which the entire surface to be polished is formed of silicon oxide, but may further include silicon nitride, polysilicon, or the like in addition to silicon oxide on the surface.
- the polishing method mainly includes a silicon oxide film, an inorganic insulating film such as glass and silicon nitride, polysilicon, Al, Cu, Ti, TiN, W, Ta, TaN and the like on a wiring board having predetermined wiring.
- the present invention can also be applied to a substrate on which a containing film is formed.
- a process of forming a shallow trench isolation (STI) structure on a substrate (wafer) by CMP using the polishing method according to the present embodiment will be described with reference to FIG.
- a first polishing step for polishing the silicon oxide film 3 at a high speed
- a second polishing step for polishing the remaining silicon oxide film 3 at a relatively low speed
- FIG. 1A is a cross-sectional view showing a substrate before polishing.
- FIG. 1B is a cross-sectional view showing the substrate after the first polishing step.
- FIG. 1C is a cross-sectional view showing the substrate after the second polishing step.
- CMP CMP
- a substrate (wafer) is arranged on the polishing pad so that the surface of the silicon oxide film 3 and the polishing pad are in contact with each other, and the surface of the silicon oxide film 3 is polished by the polishing pad. . More specifically, the surface to be polished of the silicon oxide film 3 is pressed against the polishing pad of the polishing surface plate, and the CMP polishing liquid is supplied between the surface to be polished and the polishing pad, and the two are relatively moved. The silicon oxide film 3 is polished by moving it.
- the polishing slurry for CMP according to this embodiment can be applied to both the first polishing step and the second polishing step, but can be used in the second polishing step because it can achieve a high polishing rate. preferable.
- polishing process can be performed in one stage from the state shown in FIG. 1A to the state shown in FIG.
- an apparatus including a holder for holding a substrate, a polishing surface plate to which the polishing pad is attached, and means for supplying a polishing liquid onto the polishing pad is suitable.
- a polishing apparatus (model number: EPO-111, EPO-222, FREX200, FREX300) manufactured by Ebara Manufacturing Co., Ltd., a polishing apparatus manufactured by APPLIED MATERIALS (trade name: Mirara 3400, Reflexion polishing machine), and the like can be given.
- a polishing pad For example, a general nonwoven fabric, a polyurethane foam, a porous fluororesin, etc. can be used. Further, the polishing pad is preferably subjected to groove processing so that the polishing liquid is accumulated.
- the polishing conditions are not particularly limited, but from the viewpoint of preventing the substrate from popping out, the rotation speed of the polishing platen is preferably 200 min ⁇ 1 or less.
- the pressure (working load) applied to the substrate is preferably 100 kPa or less from the viewpoint of suppressing scratches on the polished surface.
- a substrate having a desired number of layers can be manufactured by repeating the process of forming a film and polishing the film a predetermined number of times.
- the substrate thus obtained can be used as various electronic components.
- semiconductor elements include semiconductor elements, optical glasses such as photomasks, lenses, and prisms, inorganic conductive films such as ITO, optical integrated circuits / optical switching elements / optical waveguides composed of glass and crystalline materials, end faces of optical fibers, Examples include optical single crystals such as scintillators, solid laser single crystals, sapphire substrates for blue laser LEDs, semiconductor single crystals such as SiC, GaP, and GaAs, glass substrates for magnetic disks, and magnetic heads.
- optical single crystals such as scintillators, solid laser single crystals, sapphire substrates for blue laser LEDs, semiconductor single crystals such as SiC, GaP, and GaAs, glass substrates for magnetic disks, and magnetic heads.
- polishing liquid for CMP 150 g of the cerium oxide powder (abrasive grains) obtained above and 849.8 g of deionized water were placed in a container and mixed. Further, 0.2 g of acetic acid was added to adjust the pH to 4.5, and the mixture was stirred for 10 minutes. The obtained slurry was sent to another container over 30 minutes. In the meantime, ultrasonic irradiation was performed on the slurry at an ultrasonic frequency of 400 kHz in the pipe for feeding the liquid.
- Example 1 The abrasive grains are 5.0% by mass, 3-hydroxy-2-methyl-4-pyrone is 0.7% by mass as the first additive, and propionic acid is 0.9% by mass as the fourth additive.
- a slurry stock solution was obtained by adjusting with deionized water.
- the pH of the slurry stock solution was 3.0.
- the pH was measured using model number PHL-40 manufactured by Electrochemical Instrument Co., Ltd.
- Deionized water is used so that polyoxyethylene styrenated phenyl ether is 5% by mass as the second additive and diallyldimethylammonium chloride / acrylamide copolymer is 0.0015% by mass as the third additive.
- the pH was adjusted using an aqueous ammonia solution to obtain a stock solution for additive solution.
- the pH of the stock solution for additive solution was 5.7.
- the pH was measured using model number PHL-40 manufactured by Electrochemical Instrument Co., Ltd.
- the slurry stock solution the additive solution stock solution: deionized water were mixed at a mass ratio of 1: 1: 8 to obtain a polishing solution.
- the slurry storage liquid and the additive storage liquid are diluted 10 times.
- the pH of the polishing liquid was 3.5.
- the pH was measured using model number PHL-40 manufactured by Electrochemical Instrument Co., Ltd.
- Example 1 Using the abrasive grains obtained above and the additives shown in Table 1 below, as in Example 1, a slurry storage solution and an additive storage solution are prepared and mixed with deionized water. A polishing liquid having an abrasive content of 0.5% by mass and a 4-pyrone-based compound content of 0.07% by mass was prepared. In Examples 2 to 3, ammonia water was used as a pH adjuster when preparing the additive solution.
- the liquid phase was obtained as a measurement sample by centrifugation. Specifically, the centrifugal force applied to the outer periphery was 500 G, and the centrifugation time was 10 minutes. And after putting the measurement sample in the cell for zeta potential measurement, zeta potential was measured. The measurement results are shown in Table 1.
- Polishing device Reflexion (manufactured by APPLIED MATERIALS) ⁇ CMP polishing liquid flow rate: 250 mL / min ⁇ Substrate to be polished: “Blanket wafer” below Polishing pad: foamed polyurethane resin with closed cells (Rohm and Haas Japan, model number IC1010) Polishing pressure: 20.6 kPa (3.0 psi) ⁇ Rotating speed of substrate and polishing platen: 100 min -1 (rpm) Polishing time: The blanket wafer was polished for 30 seconds (0.5 min).
- a silicon oxide film having a thickness of 1 ⁇ m (10000 mm) was formed on a silicon substrate by a plasma CVD method, and a polysilicon film having a thickness of 0.2 ⁇ m (2000 mm) was formed on a silicon substrate by a CVD method.
- a substrate was used.
- the polishing rate of each film to be polished was determined from the following equation.
- polishing was calculated
- formula film thickness apparatus (Filmetrics company make, brand name: F80).
- A-1 3-hydroxy-2-methyl-4-pyrone
- A-2 5-hydroxy-2- (hydroxymethyl) -4-pyrone
- B-1 Polyoxyethylene styrenated phenyl ether (manufactured by Kao Corporation, Product name: Emulgen A-500, weight average molecular weight: 4500-5000)
- B-2 Polyoxyethylene alkyl phenyl ether (Daiichi Kogyo Seiyaku Co., Ltd., product name: emulgit, weight average molecular weight: 3000-3500)
- B-3 Polyethylene glycol (manufactured by Lion Corporation, product name: PEG600, weight average molecular weight: 600)
- C-1 diallyldimethylammonium chloride / acrylamide copolymer (manufactured by Nitto Bo Medical Co., Ltd., product name: PAS-J-81, weight average molecular weight: 200000)
- C-2 Polyallylamine (Nitto Bo Medical Co
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Abstract
Description
本実施形態に係るCMP用研磨液は、セリウム系化合物を含む砥粒と、少なくとも三種類の添加剤と、水とを含有する。本実施形態に係るCMP用研磨液は、第1の添加剤として、特定の構造を有する4-ピロン系化合物を含有し、第2の添加剤として、芳香環及びポリオキシアルキレン鎖を有する高分子化合物(以下、「芳香族ポリオキシアルキレン化合物」という。)を含有し、第3の添加剤として、陽イオン性ポリマを含有する。以下、各成分について説明する。
本実施形態に係るCMP用研磨液は、第1の添加剤として、下記一般式(I)で表される4-ピロン系化合物を含有する。これにより、絶縁材料の研磨速度の向上効果が発現する。4-ピロン系化合物は、少なくともカルボニル基の炭素原子に隣接している炭素原子にヒドロキシ基が結合した構造を有するものである。ここで、4-ピロン系化合物とは、オキシ基及びカルボニル基が含まれると共に、オキシ基に対してカルボニル基が4位に位置している6員環(γ-ピロン環)構造を有する複素環式化合物である。本実施形態の4-ピロン系化合物は、このγ-ピロン環におけるカルボニル基に隣接している炭素原子にヒドロキシ基が結合しており、それ以外の炭素原子には、水素原子、又は、水素原子以外の置換基が置換していてもよい。
芳香族ポリオキシアルキレン化合物は、ストッパ材料の研磨速度が過度に高くなることを抑制する効果がある。この効果が生じる理由は、芳香族ポリオキシアルキレン化合物がストッパ材料を被覆することにより、ストッパ材料の研磨が抑制されるものと推測される。このような効果は、ストッパ材料がポリシリコンである場合により顕著に得られる。
R11-O-(R12-O)m-H …(II)
[式(II)中、R11は、置換基を有していてもよいアリール基を表し、R12は、置換基を有していてもよい炭素数1~5のアルキレン基を表し、mは、15以上の整数を表す。]
H-(O-R23)n1-O-R21-R25-R22-O-(R24-O)n2-H …(III)
[式(III)中、R21及びR22は、それぞれ独立に、置換基を有していてもよいアリーレン基を表し、R23、R24及びR25は、それぞれ独立に、置換基を有していてもよい炭素数1~5のアルキレン基を表し、n1及びn2は、それぞれ独立に15以上の整数を表す。]
・R11としては、芳香環を有する置換基として例示した前記のアリール基が好ましく、スチレン基又はアルキル基が置換基として導入されたフェニル基がより好ましい。
・R21及びR22としては、芳香環を有する置換基として例示した前記のアリーレン基が好ましい。
・R12、R23、R24及びR25としては、エチレン基、n-プロピレン基が好ましい。
・mは、15以上が好ましく、30以上がより好ましい。
・mは、20000以下が好ましく、10000以下がより好ましく、5000以下が更に好ましく、1000以下が特に好ましい。
・n1及びn2は、15以上が好ましく、30以上がより好ましい。
・n1及びn2は、20000以下が好ましく、10000以下がより好ましく、5000以下が更に好ましく、1000以下が特に好ましい。
ポリオキシアルキレンベンジルエーテル等が挙げられる。具体的には、式(II)で表される芳香族ポリオキシアルキレン化合物としては、ポリオキシエチレンアルキルフェニルエーテル(例えば、第一工業製薬株式会社製、エマルジットシリーズ)、ポリオキシエチレンノニルプロペニルフェニルエーテル(例えば、第一工業製薬株式会社製、アクアロンRNシリーズ)、ポリオキシエチレンフェニルエーテル、ポリオキシエチレンスチレン化フェニルエーテル(例えば、花王株式会社製、エマルゲンA-500;第一工業製薬株式会社製、ノイゲンEA-7シリーズ)、ポリオキシプロピレンフェニルエーテル、ポリオキシエチレンクミルフェニルエーテル、ポリオキシエチレンベンジルエーテル等が挙げられる。式(III)で表される芳香族ポリオキシアルキレン化合物としては、2,2-ビス(4-ポリオキシエチレンオキシフェニル)プロパン等が挙げられる。
使用機器:日立L-6000型〔株式会社日立製作所製〕
カラム:ゲルパックGL-R420+ゲルパックGL-R430+ゲルパックGL-R440〔日立化成株式会社製 商品名、計3本〕
溶離液:テトラヒドロフラン
測定温度:40℃
流量:1.75mL/min
検出器:L-3300RI〔株式会社日立製作所製〕
本実施形態に係るCMP用研磨液は、前記第1の添加剤(4-ピロン系化合物)及び前記第2の添加剤(芳香族ポリオキシアルキレン化合物)の他に、第3の添加剤として陽イオン性ポリマを含有する。すなわち、第3の添加剤としては、前記第1の添加剤又は前記第2の添加剤に該当する化合物を除く。「陽イオン性ポリマ」とは、カチオン基、又は、カチオン基にイオン化され得る基を主鎖又は側鎖に有するポリマとして定義される。カチオン基としては、アミノ基、イミノ基、シアノ基等が挙げられる。
本実施形態に係るCMP用研磨液は、第4の添加剤として飽和モノカルボン酸を更に含有していてもよい。これにより、絶縁材料の研磨速度を更に向上させることができる。
本実施形態に係るCMP用研磨液は、セリウム系化合物を含む砥粒を含有する。セリウム系化合物を含む砥粒を用いた研磨液は、研磨面に生じる研磨傷が比較的少ないという特長を有する。従来、絶縁材料の高い研磨速度を達成しやすい点から、砥粒としてシリカ粒子を含む研磨液が広く用いられている。しかし、シリカ粒子を用いた研磨液は、一般に研磨面に研磨傷が生じやすいという課題がある。配線幅が45nm世代以降の微細パターンを有するデバイスにおいては、従来問題にならなかったような微細な傷であっても、デバイスの信頼性に影響するおそれがある。
研磨液の調製に用いる水は、特に制限されるものではないが、脱イオン水、イオン交換水、超純水等が好ましい。なお、必要に応じて、エタノール、酢酸、アセトン等の極性溶媒などを水と併用してもよい。
本実施形態に係るCMP用研磨液は、砥粒の分散安定性及び/又は研磨面の平坦性を向上させる観点から、界面活性剤を含有することができる。界面活性剤としては、イオン性界面活性剤及び非イオン性界面活性剤が挙げられ、非イオン性界面活性剤が好ましい。界面活性剤は、一種類を単独で用いてもよく、二種類以上を併用してもよい。
ソルビタン脂肪酸エステル、グリセロールボレイト脂肪酸エステル等のエステル型界面活性剤;
ポリオキシエチレンアルキルアミン等のアミノエーテル型界面活性剤;
ポリオキシエチレンソルビタン脂肪酸エステル、ポリオキシエチレングリセロールボレイト脂肪酸エステル、ポリオキシエチレンアルキルエステル等のエーテルエステル型界面活性剤;
脂肪酸アルカノールアミド、ポリオキシエチレン脂肪酸アルカノールアミド等のアルカノールアミド型界面活性剤;
アセチレン系ジオールのオキシエチレン付加体;ポリビニルピロリドン;ポリアクリルアミド;ポリジメチルアクリルアミド;ポリビニルアルコールなどが挙げられる。
本実施形態に係るCMP用研磨液のpHの下限は、絶縁材料の研磨速度を高く保持しやすくなる観点から、1.0以上が好ましく、2.0以上がより好ましく、3.0以上が更に好ましい。本実施形態に係るCMP用研磨液のpHの上限は、砥粒の分散状態を安定させやすくなる観点から、9.0以下が好ましく、8.0以下がより好ましく、7.0以下が更に好ましく、6.0以下が特に好ましい。なお、pHは、液温25℃におけるpHと定義する。
本実施形態に係る研磨方法は、前記CMP用研磨液を用いて、絶縁材料を含む基体(例えば基板)を研磨する研磨工程を備える。例えば、研磨工程では、絶縁材料を研磨パッドに押し当てると共に前記研磨液を絶縁材料と研磨パッドとの間に供給しながら、基体と研磨パッドの少なくとも一方を動かすことにより、研磨パッドによって絶縁材料の研磨を行う。研磨工程では、例えば、各成分の含有量及びpH等が調整された研磨液を使用し、表面に絶縁材料を有する基体をCMP技術によって平坦化する。
炭酸セリウム水和物40kgをアルミナ製容器に入れ、830℃で2時間、空気中で焼成して黄白色の粉末を20kg得た。この粉末についてX線回折法で相同定を行い、当該粉末が多結晶体の酸化セリウムを含むことを確認した。焼成によって得られた粉末の粒子径をSEMで観察したところ、20~100μmであった。次いで、酸化セリウム粉末20kgを、ジェットミルを用いて乾式粉砕した。粉砕後の酸化セリウム粉末をSEMで観察したところ、結晶粒界を有する多結晶酸化セリウム粒子を含むものであった。また、比表面積は9.4m2/gであった。比表面積の測定はBET法によって実施した。
前記で得られた酸化セリウム粉末(砥粒)150g及び脱イオン水849.8gを容器内に入れて混合した。さらに酢酸0.2gを添加してpHを4.5に調整し、10分間攪拌した。得られたスラリを別の容器に30分かけて送液した。その間、送液する配管内で、スラリに対して超音波周波数400kHzにて超音波照射を行った。
前記砥粒が5.0質量%、第1の添加剤として3-ヒドロキシ-2-メチル-4-ピロンが0.7質量%、及び、第4の添加剤としてプロピオン酸が0.9質量%となるように、脱イオン水を用いて調整して、スラリ用貯蔵液を得た。スラリ用貯蔵液のpHは3.0であった。pHは、電気化学計器株式会社製の型番PHL-40を用いて測定した。
前記で得られた砥粒と、下記表1に示す添加剤とを用いて、実施例1と同様に、スラリ用貯蔵液と添加液用貯蔵液とを用意して、脱イオン水と混合し、砥粒の含有量が0.5質量%であると共に4-ピロン系化合物の含有量が0.07質量%である研磨液を調製した。実施例2~3では、添加液を作製する際に、pH調整剤としてアンモニア水を用いた。
測定装置として、BECKMAN COULTER社製、Delsa Nano Cを使用し、前記測定装置における測定サンプルの散乱強度が1.0×104~5.0×104cpsとなるように、CMP用研磨液を遠心分離して、液相を測定サンプルとして得た。具体的な遠心分離条件は、外周にかかる遠心力が500Gであり、遠心分離時間が10分間であった。そして、測定サンプルをゼータ電位測定用セルに入れた後、ゼータ電位を測定した。測定結果を表1に示す。
前記CMP用研磨液のそれぞれを用いて下記研磨条件で被研磨基板を研磨した。
・研磨装置:Reflexion(APPLIED MATERIALS社製)
・CMP用研磨液流量:250mL/min
・被研磨基板:下記「ブランケットウエハ」
・研磨パッド:独立気泡を有する発泡ポリウレタン樹脂(ローム・アンド・ハース・ジャパン株式会社製、型番IC1010)
・研磨圧力:20.6kPa(3.0psi)
・基板と研磨定盤の回転速度:100min-1(rpm)
・研磨時間:ブランケットウエハを30秒間(0.5min)研磨した。
ブランケットウエハとして、厚さ1μm(10000Å)の酸化珪素膜をシリコン基板上にプラズマCVD法で形成した基板と、厚さ0.2μm(2000Å)のポリシリコン膜をシリコン基板上にCVD法で形成した基板とを用いた。
前記条件で研磨した被研磨基板について、各被研磨膜(酸化珪素膜、ポリシリコン膜)の研磨速度を次式より求めた。なお、研磨前後での各被研磨膜の膜厚差は、光干渉式膜厚装置(フィルメトリクス社製、商品名:F80)を用いて求めた。また、ポリシリコン膜に対する酸化珪素膜の研磨選択性(研磨速度比:酸化珪素膜の研磨速度/ポリシリコン膜の研磨速度)を算出した。測定結果を表1に示す。
(研磨速度)=(研磨前後での各被研磨膜の膜厚差(Å))/(研磨時間(min))
A-1:3-ヒドロキシ-2-メチル-4-ピロン
A-2:5-ヒドロキシ-2-(ヒドロキシメチル)-4-ピロン
B-1:ポリオキシエチレンスチレン化フェニルエーテル(花王株式会社製、製品名:エマルゲンA-500、重量平均分子量:4500~5000)
B-2:ポリオキシエチレンアルキルフェニルエーテル(第一工業製薬株式会社製、製品名:エマルジット、重量平均分子量:3000~3500)
B-3:ポリエチレングリコール(ライオン株式会社製、製品名:PEG600、重量平均分子量:600)
C-1:ジアリルジメチルアンモニウムクロリド・アクリルアミド共重合体(ニットーボーメディカル株式会社製、製品名:PAS-J-81、重量平均分子量:200000)
C-2:ポリアリルアミン(ニットーボーメディカル株式会社製、製品名:PAA-01、重量平均分子量:1600)
C-3:ジアリルジメチルアンモニウムクロリド重合体(ニットーボーメディカル株式会社製、製品名:PAS-H-10L、重量平均分子量:200000)
D-1:プロピオン酸
Claims (8)
- 当該研磨液中における前記砥粒のゼータ電位が正である、請求項1に記載の研磨液。
- 前記4-ピロン系化合物が、3-ヒドロキシ-2-メチル-4-ピロン、5-ヒドロキシ-2-(ヒドロキシメチル)-4-ピロン、及び、2-エチル-3-ヒドロキシ-4-ピロンからなる群より選ばれる少なくとも一種である、請求項1又は2に記載の研磨液。
- 飽和モノカルボン酸を更に含有する、請求項1~3のいずれか一項に記載の研磨液。
- 前記飽和モノカルボン酸の炭素数が2~6である、請求項4に記載の研磨液。
- 前記飽和モノカルボン酸が、酢酸、プロピオン酸、酪酸、イソ酪酸、吉草酸、イソ吉草酸、ピバル酸、ヒドロアンゲリカ酸、カプロン酸、2-メチルペンタン酸、4-メチルペンタン酸、2,3-ジメチルブタン酸、2-エチルブタン酸、2,2-ジメチルブタン酸及び3,3-ジメチルブタン酸からなる群より選ばれる少なくとも一種である、請求項4又は5に記載の研磨液。
- 第1の液及び第2の液に分けて保存され、前記第1の液が、前記砥粒及び水を少なくとも含み、前記第2の液が、前記高分子化合物、前記陽イオン性ポリマ及び水を少なくとも含む、請求項1~6のいずれか一項に記載の研磨液。
- 請求項1~7のいずれか一項に記載の研磨液を用いて、絶縁材料を含む基体を研磨する工程を備える、研磨方法。
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| WO2023150244A1 (en) * | 2022-02-03 | 2023-08-10 | Cmc Materials, Inc. | Ceria-based slurry compositions for selective and nonselective cmp of silicon oxide, silicon nitride, and polysilicon |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20160018661A (ko) | 2016-02-17 |
| JP6252587B2 (ja) | 2017-12-27 |
| US20160137881A1 (en) | 2016-05-19 |
| JPWO2014199739A1 (ja) | 2017-02-23 |
| KR102225154B1 (ko) | 2021-03-09 |
| TWI613284B (zh) | 2018-02-01 |
| TW201500532A (zh) | 2015-01-01 |
| US10155886B2 (en) | 2018-12-18 |
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