WO2013180079A1 - 化学機械研磨用スラリーおよび化学機械研磨方法 - Google Patents
化学機械研磨用スラリーおよび化学機械研磨方法 Download PDFInfo
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- WO2013180079A1 WO2013180079A1 PCT/JP2013/064676 JP2013064676W WO2013180079A1 WO 2013180079 A1 WO2013180079 A1 WO 2013180079A1 JP 2013064676 W JP2013064676 W JP 2013064676W WO 2013180079 A1 WO2013180079 A1 WO 2013180079A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
- H01L21/31055—Planarisation of the insulating layers involving a dielectric removal step the removal being a chemical etching step, e.g. dry etching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- 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
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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
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
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- 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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/76224—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
Definitions
- the present invention relates to a chemical mechanical polishing slurry suitable for manufacturing a semiconductor substrate and a chemical mechanical polishing method using the slurry.
- STI Shallow Trench Isolation
- interlayer insulating film planarization damascene process
- metal plug is one of three-dimensional metal wiring having a structure penetrating an interlayer insulating film. It is.
- CMP Chemical Mechanical Polishing
- the STI formation step after forming a groove to be an element isolation region and forming a polishing stop film in a region other than the groove, an insulating film for element isolation is formed inside the groove and on the polishing stop film. Next, the excess insulating film is polished and removed by CMP until the polishing stop film is exposed and planarized.
- silicon nitride is used as the stop film, and silicon oxide is often used as the insulating film.
- both the polishing rate of the stop film and the insulating film decrease when the stop film is exposed.
- polishing is performed for a relatively long time even after the stop film is exposed in a region where the polishing rate on the wafer is high.
- the polishing rate of the insulating film is high even after the exposure of the stop film, the insulating film in the pattern recess, which is the element isolation region (STI region), is excessively removed (dishing phenomenon), and the performance and reliability of the device Decreases.
- a slurry containing a combination of ceria (cerium oxide) abrasive grains and an anionic polymer is mainly used for high planarization and polishing suppression during excessive polishing (for example, Patent Documents 1 and 2).
- the system which uses an anionic polymer, polyvinylpyrrolidone, a cation compound, and an amphoteric ion compound together is also known (for example, patent document 3).
- systems using low molecular weight compounds selected from specific amino alcohols, aminocarboxylic acids, hydroxycarboxylic acids, and the like are also known (for example, Patent Documents 4 and 5).
- the STI region is generally formed through the following steps. 1 to 4 are schematic cross-sectional views showing step-by-step STI formation steps in the semiconductor device manufacturing process.
- the dimension of each part in a figure was set in order to make an understanding easy, and the dimension ratio between each part does not necessarily correspond with an actual thing.
- a stop film 3 is laminated on an oxide insulating film 2 (such as silicon oxide) on the surface of the substrate 1.
- a resist film (not shown) is laminated by photolithography on the substrate 1 on which the oxide insulating film 2 and the stop film 3 are laminated, and after etching, the resist film is removed to form the groove 4 (etched portion). Formed (FIG. 1).
- An insulating film 5 (silicon oxide or the like) is laminated by CVD or the like so as to fill the groove 4 (FIG. 2).
- the surplus insulating film 5 formed on the stop film 3 is polished and removed by CMP to completely expose the stop film.
- the stop film 3 and the insulating film 5 embedded in the trench 4 and forming the STI region 6 are flat without any step (FIG. 3).
- the substrate has waviness and the distribution and pressure of the slurry on the substrate are not completely uniform, it is practically difficult to uniformly polish the entire substrate. Therefore, if polishing is performed until all the stop films 3 on the substrate are completely exposed, the insulating film 5 filled in the trenches 4 is further polished at the portion where the stop films 3 are exposed at an early stage. Problem (excessive polishing) occurs. In this excessively polished portion, the level difference is further increased, and the film thickness of the element isolation insulating film 5 is further reduced.
- the present invention provides a slurry for chemical mechanical polishing that is excellent in the ability to planarize a film to be polished (hereinafter sometimes referred to as “planarization performance”) and the ability to remove excess insulating film, ,
- a chemical mechanical polishing slurry capable of extremely reducing the level difference between the insulating film and the stop film in the STI formation step hereinafter sometimes referred to as “CMP slurry”
- CMP slurry a chemical machine using the slurry
- An object is to provide a polishing method (hereinafter sometimes abbreviated as “CMP”).
- the abrasive grains (a), a compound (b) having an amino group having a pKa greater than 9 and three or more hydroxyl groups (hereinafter abbreviated as “compound (b)”)
- compound (b) a compound having an amino group having a pKa greater than 9 and three or more hydroxyl groups
- concentration of the abrasive grains (a) is 0.1 to 20% by mass; The concentration of the compound (b) is 0.001 to 1% by mass; The slurry for chemical mechanical polishing of [1].
- abrasive grain (a) is at least one selected from the group consisting of cerium oxide, manganese oxide, iron oxide, titanium oxide, magnesium oxide, zirconium oxide and tantalum oxide. Slurry for chemical mechanical polishing.
- the water-soluble polymer (c) is 25 to 100% by mass of at least one monomer selected from the group consisting of (meth) acrylic acid, maleic acid, itaconic acid and vinylpyrrolidone, and 75 to 0% by mass of other monomers having an unsaturated double bond
- Mechanical polishing slurry is at least one selected from the group consisting of: [11]
- the chemistry according to any one of [1] to [10] further comprising a compound (d) having a structure represented by the formula (1) or (2) at a concentration of 0.0001 to 1% by mass. Mechanical polishing slurry.
- R 1 , R 2 and R 3 each independently represents an alkylene group having 1 to 6 carbon atoms).
- R 4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
- n represents an integer of 0 to 9.
- the compound (d) is iminodiacetic acid, N- (2-hydroxyethyl) iminodiacetic acid, aspartic acid-N, N-diacetic acid, nitrilotriacetic acid, N- (2-hydroxyethyl) ethylenediamine- N, N ′, N′-triacetic acid, ethylenediamine-N, N, N ′, N′-tetraacetic acid, propylenediamine-N, N, N ′, N′-tetraacetic acid, glycol ether diamine-N, N, N ′, N′-tetraacetic acid, 1,2-diaminocyclohexane-N, N, N ′, N′-tetra
- the abrasive grain (a) is at least one selected from the group consisting of cerium oxide, manganese oxide, iron oxide, titanium oxide, magnesium oxide, zirconium oxide and tantalum oxide having an average particle diameter of 1 to 500 nm.
- the compound (b) is at least one selected from the group consisting of glucamine, N-methylglucamine and N-ethylglucamine.
- a water-soluble polymer (c) which is at least one selected from the group consisting of polyacrylic acid having a weight average molecular weight of 2,500 to 100,000, polyvinylpyrrolidone and pullulan.
- N- (2-hydroxyethyl) ethylenediamine-N, N ′, N′-triacetic acid, ethylenediamine-N, N, N ′, N′-tetraacetic acid, and diethylenetriamine-N, N, N ′ , N ′′, N ′′ -pentaacetic acid at least one compound (d) selected from the group consisting of 0.0001 to 1% by mass, the chemistry according to any one of [13] to [19] Mechanical polishing slurry.
- a slurry for chemical mechanical polishing that is excellent in the planarization performance of a film to be polished on a substrate and the ability to remove excess insulating film, and in particular, in the STI formation step,
- a slurry for chemical mechanical polishing capable of extremely reducing the level difference between them, and a chemical mechanical polishing method using the slurry.
- the CMP slurry of the present invention contains abrasive grains (a), a compound (b) having an amino group having a pKa greater than 9 and three or more hydroxyl groups, and water as essential components.
- any inorganic compound, organic compound, and organic-inorganic composite material can be used.
- cerium oxide, manganese oxide, iron oxide, titanium oxide, magnesium oxide, zirconium oxide, tantalum oxide examples thereof include silicon oxide, aluminum oxide, tin oxide, diamond, fullerene and polystyrene.
- the abrasive grains (a) are at least one selected from the group consisting of cerium oxide, manganese oxide, iron oxide, titanium oxide, magnesium oxide, zirconium oxide and tantalum oxide, so that the polishing rate is high and polishing scratches are reduced. It is preferable because of its excellent resistance.
- cerium oxide is particularly preferable as the abrasive grain (a) because the planarization performance is further improved.
- only 1 type may be used for an abrasive grain (a), and 2 or more types may be used together.
- the concentration of the abrasive grains (a) in the CMP slurry of the present invention is preferably 0.1 to 20% by mass because of excellent polishing rate, flattening performance, and abrasive dispersion stability, and is preferably 0.12 to The content is more preferably 15% by mass, and further preferably 0.15 to 10% by mass. If the content of the abrasive grains (a) is less than 0.1% by mass, the polishing rate tends to decrease, and if it exceeds 20% by mass, the abrasive grains may aggregate. From the viewpoint of polishing rate and suppression of polishing scratches, the content of the polishing abrasive grain (a) is most preferably in the range of 0.2 to 5% by mass.
- the average particle diameter of the abrasive grains (a) is preferably 1 to 500 nm, since the polishing rate is excellent and the polishing scratches on the film to be polished are small.
- the average particle size of the abrasive grains (a) is more preferably 5 to 400 nm, and further preferably 10 to 300 nm. If the average particle size is less than 1 nm, the polishing rate may decrease, and if the average particle size exceeds 500 nm, polishing flaws are likely to occur.
- the average particle size of the abrasive grains (a) can be determined by analyzing by a cumulant method using a particle size measuring device “ELSZ-2” manufactured by Otsuka Electronics Co., Ltd.
- the compound (b) is a compound having an amino group having a pKa that is the common logarithm of the reciprocal of the acid dissociation constant (Ka) greater than 9, and three or more hydroxyl groups.
- Ka acid dissociation constant
- the pKa of the amino group of the compound (b) is more preferably from 9.1 to 11, further preferably from 9.2 to 10.5, particularly preferably from 9.3 to 10.
- pKa of the amino group of a compound (b) shows the value in 20 degreeC in water.
- pKa value can be determined by potentiometric titration.
- the pKa of an amino group means “pKa of a conjugate acid of an amino group”.
- the following can be considered as a mechanism by which the CMP slurry of the present invention using the compound (b) exhibits an excellent effect. Since the pKa of the amino group of the compound (b) is in the above range, the balance between the electrophilicity of the amino group protonated in water (that is, the conjugate acid of the amino group) and the nucleophilicity of the amino group is good. become.
- the adsorption strength of the compound (b) to the film to be polished becomes moderate, and the low adsorption to the pattern convex part and the film without the pattern and the high adsorption to the pattern concave part are high under normal polishing conditions.
- the present invention is not limited to such an estimation mechanism.
- the number of amino groups having a pKa greater than 9 in the compound (b) is preferably 1 or 2, from the viewpoint of slurry stability and polishing scratch suppression, and particularly preferably 1.
- the amino group having a pKa greater than 9 in the compound (b) is preferably primary or secondary from the viewpoint of excellent planarization performance, and particularly preferably secondary.
- the number of hydroxyl groups in the compound (b) is 3 or more.
- the number of hydroxyl groups contained in the compound (b) is preferably 4 to 20, from the viewpoint of further excellent polishing rate and flattening performance, and more preferably 5 to 10.
- the molecular weight of the compound (b) is preferably from 100 to 1,000 because of excellent polishing rate and planarization performance. If the molecular weight is smaller than 100, the planarization performance tends to be lowered, and if it exceeds 1000, the polishing rate and the polishing uniformity are likely to be lowered.
- the molecular weight of the compound (b) is more preferably 120 to 800, further preferably 140 to 600, and particularly preferably 160 to 400.
- the compound (b) preferably has one amino group and four or more hydroxyl groups, and the pKa of the amino group is larger than 9, more preferably glucamine and / or a derivative thereof.
- glucamine and derivatives thereof any of D-form, L-form, D-form and a mixture of L-form can be used, but those D-forms are preferred from the viewpoint of availability.
- the glucamine derivative include N-methylglucamine, N-ethylglucamine, N-butylglucamine, N-octylglucamine and the like.
- glucamine N-methylglucamine and N-ethylglucamine
- a compound (b) may use only 1 type and may use 2 or more types together.
- the concentration of the compound (b) in the CMP slurry of the present invention is preferably 0.001 to 1% by mass because of excellent polishing rate and planarization performance.
- the concentration of the compound (b) is more preferably 0.002 to 0.8% by mass, further preferably 0.003 to 0.6% by mass, and 0.004 to 0.4% by mass. It is particularly preferred.
- the CMP slurry of the present invention may further contain a water-soluble polymer (c) (hereinafter sometimes abbreviated as “polymer (c)”) as an optional component.
- a polymer (c) As for a polymer (c), all may use only 1 type and may use 2 or more types together.
- water-soluble means that the solubility in water at 20 ° C. is 1 g / L or more.
- the polymer (c) is preferably an anionic polymer and / or a nonionic polymer because of excellent polishing speed and flattening performance.
- an anionic polymer means a polymer having an anionic functional group (for example, a carboxy group in which a proton is dissociated) having a negative charge when dissolved in water. It means a polymer containing neither an anionic functional group having a negative charge or a cationic functional group having a positive charge when dissolved in water.
- the polymer (c) is preferably 25 to 100% by mass of at least one monomer selected from the group consisting of (meth) acrylic acid, maleic acid, itaconic acid and vinylpyrrolidone, and another monomer having an unsaturated double bond (for example, (meth) Methyl acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, styrene, methyl vinyl ether, vinyl pyrrolidone, ethylene, propylene, butadiene, etc.
- monomer for example, (meth) Methyl acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, styrene, methyl vinyl ether, vinyl pyrrolidone,
- polyoxyethylene group means a group having 4 or more (preferably 4 to 200, more preferably 8 to 100) oxyethylene groups (—OC 2 H 4 —) bonded thereto. means.
- the polymer (c) is more preferably 25 to 100% by mass of at least one monomer selected from the group consisting of (meth) acrylic acid, maleic acid, itaconic acid and vinylpyrrolidone, and 75 to 0% by mass of other monomers having an unsaturated double bond
- a water-soluble polymer (c1) obtained by polymerizing At least one water-soluble polysaccharide (c6) selected from the group consisting of dextran and pullulan; and their derivatives (c7) (for example, water-soluble esterified at least part of the carboxy group of (c1) or (c6) above) Polymer, water-soluble polymer obtained by esterifying at least part of the hydroxyl group of (c1) or (c6), water-soluble polymer obtained by alkyl etherification of at least part of the hydroxyl group of (c1) or (c6) ) At least one selected from the group consisting of Such a polymer (c) is particularly effective in improving the polishing rate and planarization performance, and exhibits a syner
- the polymer (c) is more preferably 50% to 100% by mass of at least one monomer selected from the group consisting of (meth) acrylic acid and vinyl pyrrolidone, and another monomer having an unsaturated double bond. At least one selected from the group consisting of a polymer obtained by polymerizing 50 to 0% by mass of a polymer, dextran and pullulan, more preferably at least selected from the group consisting of polyacrylic acid, polyvinylpyrrolidone and pullulan. One, and even more preferably at least one selected from the group consisting of polyacrylic acid and polyvinylpyrrolidone.
- the polymer (c) is particularly preferably polyacrylic acid or polyvinylpyrrolidone, and most preferably polyacrylic acid.
- the polymer (c) has an acidic functional group such as a carboxy group
- a part or all of the acidic functional group may be in the form of a salt.
- the weight average molecular weight (Mw) of the polymer (c) is preferably 1,000 to 1,000,000. When Mw is less than 1,000, the effect of improving the planarization performance by the polymer (c) tends to be low. On the other hand, when Mw exceeds 1,000,000, the viscosity of the slurry for CMP becomes high, the polishing rate and the polishing uniformity are likely to be lowered, and the abrasive grains may be easily aggregated.
- the Mw of the polymer (c) is more preferably 1,500 to 500,000, further preferably 2,000 to 200,000, and particularly preferably 2,500 to 100,000. .
- the Mw of the polymer (c) is polyethylene glycol or polyethylene oxide as a standard substance, and a GPC column (“GMPWXL” manufactured by Tosoh Corporation) is connected to a GPC apparatus (“150C” manufactured by Waters) with 200 mM phosphoric acid.
- GPC apparatus 150C manufactured by Waters
- An aqueous salt solution can be measured as a mobile phase.
- the concentration of the polymer (c) in the CMP slurry of the present invention is preferably 0.001 to 5% by mass because of excellent polishing rate and planarization performance.
- the concentration of the polymer (c) is more preferably 0.005 to 3% by mass, further preferably 0.01 to 1% by mass, and particularly preferably 0.02 to 0.5% by mass. preferable.
- the CMP slurry of the present invention further contains, as an optional component, a compound (d) having a structure represented by the formula (1) or (2) (hereinafter sometimes abbreviated as “compound (d)”). It may be. Only 1 type may be used for a compound (d) and it may use 2 or more types together.
- the planarization performance and pattern uniformity performance of the CMP slurry can be further improved.
- the pattern uniformity performance in the present invention means the ability to suppress variations in the polishing amount of different wafer patterns.
- a part or all of the carboxy group of the compound (d) may be in the form of a salt.
- R 1 , R 2 and R 3 in the formulas (1) and (2) are each independently an alkylene group having 1 to 6 carbon atoms (preferably having 1 to 3 carbon atoms).
- R 4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms (more preferably a methyl group or an ethyl group).
- n represents an integer of 0 to 9 (preferably an integer of 0 to 5).
- Compound (d) is preferably iminodiacetic acid, N- (2-hydroxyethyl) iminodiacetic acid, aspartic acid-N, N-diacetic acid, nitrilotriacetic acid, N- (2-hydroxyethyl) ethylenediamine-N , N ′, N′-triacetic acid, ethylenediamine-N, N, N ′, N′-tetraacetic acid, propylenediamine-N, N, N ′, N′-tetraacetic acid, glycol ether diamine-N, N, N ', N'-tetraacetic acid, 1,2-diaminocyclohexane-N, N, N', N'-tetraacetic acid, diethylenetriamine-N, N, N ', N ", N" -pentaacetic acid, triethylenetetramine- N, N, N ′, N ′′, N ′ ′′, N ′ ′′-hex
- Compound (d) is more preferably N- (2-hydroxyethyl) ethylenediamine-N, N ′, N′-triacetic acid, ethylenediamine-N, N, N ′, N′-tetraacetic acid, and diethylenetriamine-N , N, N ′, N ′′, N ′′ -pentaacetic acid, particularly preferably ethylenediamine-N, N, N ′, N′-tetraacetic acid.
- the concentration is preferably 0.0001 to 1% by mass, because it is excellent in planarization performance and pattern uniformity performance, and is preferably 0.001 to 0%.
- the content is more preferably 0.5% by mass, still more preferably 0.005 to 0.3% by mass, and particularly preferably 0.01 to 0.2% by mass.
- the pH of the CMP slurry of the present invention is preferably 3 to 11 in view of excellent polishing rate, planarization performance and stability of the CMP slurry, and more preferably 4 to 10.
- the pH of the CMP slurry of the present invention is, for example, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, 2-hydroxyethyltrimethylammonium hydroxide, ammonia, trimethylamine, triethylamine, ethylenediamine, diethylenetriamine, N, N, N ', N'-tetramethylethylenediamine, N, N-dimethylethanolamine, N, N-dibutylethanolamine, N-methyldiethanolamine, N-butyldiethanolamine, triethanolamine, 2- (2-aminoethylamino) ethanol, Bases such as 1- (2-hydroxyethyl) piperazine and imidazole; acids such as hydrochloric acid, nitric acid, sulfuric acid, ace
- the CMP slurry of the present invention further includes a cationic polymer, an amphoteric polymer, a surfactant, a dispersant, an antibacterial agent, an oxidizing agent, a reducing agent, a water-soluble organic solvent, and the like that do not impair the effects of the present invention. It may contain.
- the slurry for CMP of the present invention is suitable for flattening the concavo-convex pattern formed on the insulating film, and in particular for CMP for polishing and flattening the insulating film to form shallow trench isolation (STI). Is particularly useful.
- the CMP slurry of the present invention is extremely excellent in planarization performance because both the polishing rate of the stop film and the insulating film are reduced when the stop film is exposed.
- Examples of the stop film include a silicon nitride film and a polysilicon film. Since the effect of the present invention is further exhibited, it is preferable to use the CMP slurry of the present invention for CMP in which the stop film is a silicon nitride film and the insulating film is a silicon oxide film. Note that the CMP slurry of the present invention may be used for CMP of a silicon oxide film modified with a small amount of boron, phosphorus, carbon, fluorine, or the like.
- Known means can be used for CMP using the CMP slurry of the present invention.
- CMP using a known means for example, while supplying the CMP slurry of the present invention to the surface of the polishing pad affixed on the polishing surface plate, the wafer on which the film to be polished is pressed and pressed, A method of polishing the film to be polished by rotating both the polishing surface plate and the wafer is mentioned.
- the polishing pad that can be used in the CMP of the present invention is not particularly limited, and any of foamed resin, non-foamed resin, non-woven fabric, and the like can be used.
- it may be a single-layer pad consisting only of a polishing layer, or may be a two-layer pad provided with a cushion layer under the polishing layer.
- a method of supplying the CMP slurry of the present invention onto the polishing pad it may be sent as a single solution containing all components, or a plurality of solutions containing each component may be sent to the middle of the piping or pad. You may mix and adjust to a desired density
- polishing performance was evaluated by the following method.
- the film thickness measuring device “Nanospec Model 5100” manufactured by Nanometrics was used to measure the film thickness of silicon oxide and silicon nitride with an objective lens having a magnification of 10.
- Step measurement of patterned wafer Using a surface roughness measuring machine “SJ-400” manufactured by Mitutoyo Co., Ltd., with a standard stylus, measurement range 80 ⁇ m, JIS2001, GAUSS filter, cutoff value ⁇ c 2.5 mm, and cutoff value ⁇ s 8.0 ⁇ m The step of the pattern wafer was obtained from the cross-sectional curve.
- a polishing pad “IC1400 (concentric groove); diameter 380 mm” manufactured by Nitta Haas Co., Ltd. is attached to the polishing surface plate of a polishing device “BC-15” manufactured by MTT Corporation, and a diamond dresser manufactured by Allied Material Co., Ltd.
- the surface of the polishing pad was ground for 60 minutes at a dresser rotation speed of 140 rpm, a polishing pad rotation speed of 100 rpm, and a dresser load of 5 N while flowing pure water at a rate of 150 mL / min (hereinafter “conditioning”). Called).
- a silicon oxide film having a film thickness of 1000 nm and no pattern (plasma chemical vapor deposition) while supplying a slurry for CMP at a rate of 120 mL / min under the conditions of a polishing pad rotation speed of 100 rpm, a wafer rotation speed of 99 rpm, and a polishing pressure of 24 kPa.
- a silicon wafer having a diameter of 2 inches having a PETEOS silicon oxide film) formed on the surface was polished for 60 seconds without conditioning. Then, after conditioning for 30 seconds, the wafer was exchanged and the polishing and conditioning were repeated again to polish a total of 10 wafers.
- one STI polishing evaluation pattern wafer “SKW3-2” made by SKW having a concavo-convex pattern in which linear convex portions and concave portions are alternately and repeatedly arranged was polished under the same conditions as described above.
- the pattern wafer has various pattern areas, and the following areas of the patterns (i) to (v) were selected as measurement targets of film thickness and level difference.
- the pattern (ii) exists at a plurality of locations in the wafer, but the pattern adjacent to the pattern (i) at a position of about 9 mm from the center of the wafer was used as a measurement target.
- the initial step between the convex part and the concave part is about 500 nm
- the pattern convex part is a silicon oxide film having a film thickness of 13 nm on the silicon wafer, a silicon nitride film having a film thickness of 110 nm thereon, and further A silicon oxide film having a thickness of 670 nm (HDP silicon oxide film formed by high-density plasma chemical vapor deposition) is laminated thereon, and the pattern recess has a thickness of 670 nm after etching a silicon wafer by 400 nm to form a groove.
- This is a structure in which an HDP silicon oxide film is formed.
- the point at which the silicon oxide film on the convex silicon nitride film of the pattern (i) disappears by polishing is referred to as “just polishing”, and the silicon oxide film and silicon nitride film of the pattern (i) in the just polishing are The film thickness and pattern level difference were measured. Thereafter, the pattern wafer is further polished for a time corresponding to 30% of the polishing time required for just polishing, and an over-polishing model test is performed. The film thickness and level difference of the pattern (i) are measured again, and the pattern ( The film thicknesses ii) to (v) were measured.
- the amount of decrease in film thickness and the amount of increase in level difference during overpolishing are smaller because of excellent planarization performance. Moreover, since the one where the difference in the film thickness in each pattern after overpolishing is smaller is polished uniformly irrespective of the pattern shape, it is preferable. Further, the difference in film thickness between the recesses of the pattern (ii) and the pattern (iii) (that is, [the recess film thickness of the pattern (ii)] ⁇ [the recess film thickness of the pattern (iii)]) is defined as “pattern dimension dependent performance”.
- the film thickness difference between the recesses of the pattern (iv) and the pattern (v) is evaluated as “pattern density dependent performance”. As evaluated. In any case, a smaller value is preferred.
- Example 1 Cerium oxide abrasive particles (Showa Denko Co., Ltd. abrasive “GPL-C1010”, stock solution concentration 10 mass%, average particle size 200 nm) 50 g, N-methylglucamine (Wako Pure Chemical Industries, Ltd.) 0.5 g, poly After uniformly mixing 2.5 g of acrylic acid (Wako Pure Chemical Industries, Ltd., weight average molecular weight 5,000) and 900 g of pure water, 28% by mass ammonia water (Wako Pure Chemical Industries, Ltd.) and pure water were added. In addition, 1000 g of CMP slurry having a pH of 5.0 was prepared.
- the concentration of the abrasive grains (a) (cerium oxide abrasive grains) in the slurry is 0.5 mass%
- the concentration of the compound (b) (N-methylglucamine) is 0.05 mass%
- the polymer (c) The concentration of (polyacrylic acid) is 0.25% by mass.
- the polishing performance of the pattern wafer As a result of evaluating the polishing performance of the pattern wafer, as shown in Table 2, in the CMP slurry of Example 1, the recess thickness reduction amount of the pattern (i) being excessively polished was 17 nm, and the step height increase was 15 nm. Therefore, the polishing suppression effect and the planarization performance at the time of excessive polishing were extremely excellent. Further, as shown in Table 2, the pattern dimension-dependent performance and the pattern density-dependent performance were as small as 6 nm and 23 nm, respectively, and the pattern uniformity performance was also excellent.
- Example 2 to 6 A CMP slurry was prepared in the same manner as in Example 1 except that the components and concentration of the CMP slurry were changed as shown in Table 1. The pH of the slurry was as shown in Table 1, and was adjusted with aqueous ammonia or hydrochloric acid.
- the CMP slurries of Examples 2 to 6 have both a small step increase amount and a thin film thickness decrease amount of the pattern (i) during excessive polishing, It was extremely excellent in polishing suppression effect and planarization performance at the time of excessive polishing. Furthermore, as shown in Table 2, both the pattern dimension-dependent performance and the pattern density-dependent performance were small, and the pattern uniformity performance was excellent.
- a CMP slurry was prepared in the same manner as in Example 1 except that the components and concentration of the CMP slurry were changed as shown in Table 3.
- the pH of the slurry was as shown in Table 3, and was adjusted with aqueous ammonia or hydrochloric acid.
- a CMP slurry was prepared in the same manner as in Example 1 except that the components and concentration of the CMP slurry were changed as shown in Table 5.
- the pH of the slurry was as shown in Table 5 and was adjusted with aqueous ammonia or hydrochloric acid.
- Comparative Examples 7 to 12 both had a large step increase amount and a concave film thickness decrease amount of the pattern (i) during overpolishing, It was inferior in the polishing suppression effect and planarization performance at the time of excessive polishing. Further, as shown in Table 6, Comparative Examples 7 and 8 have both large pattern dimension-dependent performance and pattern density-dependent performance, and Comparative Examples 9 to 12 have large pattern density-dependent performance, both of which are inferior in pattern uniformity performance. It was.
- the present invention provides a slurry for CMP that can be applied to a manufacturing process of various semiconductor devices including polishing of a silicon oxide film formed on a semiconductor substrate, and CMP using the slurry.
- the CMP slurry of the present invention is particularly suitable for polishing for forming a shallow trench isolation (STI forming process).
- STI forming process the step between the insulating film and the stop film is extremely small. A polishing film can be obtained, and the yield at the time of manufacturing a semiconductor substrate can be improved.
- Substrate 2 Oxide insulating film (silicon oxide, etc.) 3 Stop film (silicon nitride, etc.) 4 groove 5 insulating film (silicon oxide, etc.) 6 STI region h step t thickness of insulating film
Abstract
Description
pKaが9より大きいアミノ基、および3個以上の水酸基を有する化合物(b)と、
水と
を含有する化学機械研磨用スラリー。
[2] 化学機械研磨用スラリー中、
前記砥粒(a)の濃度が0.1~20質量%であり、
前記化合物(b)の濃度が0.001~1質量%である、
前記[1]の化学機械研磨用スラリー。
[3] 前記砥粒(a)が酸化セリウム、酸化マンガン、酸化鉄、酸化チタン、酸化マグネシウム、酸化ジルコニウムおよび酸化タンタルからなる群から選ばれる少なくとも一つである、前記[1]または[2]の化学機械研磨用スラリー。
[4] 前記化合物(b)のアミノ基のpKaが9.2~10.5である、前記[1]~[3]のいずれかの化学機械研磨用スラリー。
[5] 前記化合物(b)のアミノ基の数が1である、前記[1]~[4]のいずれかの化学機械研磨用スラリー。
[6] 前記化合物(b)の分子量が100~1000である、前記[1]~[5]のいずれかの化学機械研磨用スラリー。
[7] 前記化合物(b)が、グルカミンおよび/またはその誘導体である、前記[1]~[6]のいずれかの化学機械研磨用スラリー。
[8] さらに、水溶性重合体(c)を0.001~5質量%の濃度で含有する、前記[1]~[7]のいずれかの化学機械研磨用スラリー。
[9] 前記水溶性重合体(c)が、アニオン性重合体および/または非イオン性重合体である、前記[8]の化学機械研磨用スラリー。
[10] 前記水溶性重合体(c)が、
(メタ)アクリル酸、マレイン酸、イタコン酸およびビニルピロリドンからなる群から選ばれる少なくとも一つの単量体25~100質量%と、不飽和二重結合を有するその他の単量体75~0質量%とを重合して得られた水溶性重合体(c1);
加水分解によりビニルアルコール骨格を形成する単量体50~100質量%と、不飽和二重結合を有するその他の単量体50~0質量%とを重合した後に加水分解して得られた水溶性重合体(c2);
水溶性多糖類(c3);
カルボキシ基および/またはポリオキシエチレン基を有する水溶性ポリウレタン(c4);および
それらの水溶性誘導体(c5)
からなる群から選ばれる少なくとも一つである、前記[8]または[9]の化学機械研磨用スラリー。
[11] さらに、式(1)または(2)で示される構造を有する化合物(d)を0.0001~1質量%の濃度で含有する、前記[1]~[10]のいずれかの化学機械研磨用スラリー。
R4は、水素原子または炭素数1~3のアルキル基を表す。
nは、0~9の整数を表す。)
[12] 前記化合物(d)が、イミノ二酢酸、N-(2-ヒドロキシエチル)イミノ二酢酸、アスパラギン酸-N,N-二酢酸、ニトリロ三酢酸、N-(2-ヒドロキシエチル)エチレンジアミン-N,N’,N’-三酢酸、エチレンジアミン-N,N,N’,N’-四酢酸、プロピレンジアミン-N,N,N’,N’-四酢酸、グリコールエーテルジアミン-N,N,N’,N’-四酢酸、1,2-ジアミノシクロヘキサン-N,N,N’,N’-四酢酸、ジエチレントリアミン-N,N,N’,N”,N”-五酢酸、トリエチレンテトラミン-N,N,N’,N”,N'”,N'”-六酢酸、3-ヒドロキシ-2,2’-イミノジコハク酸、およびエチレンジアミンジコハク酸からなる群から選ばれる少なくとも一つである、前記[11]の化学機械研磨用スラリー。
[13] 前記砥粒(a)が、平均粒径が1~500nmである酸化セリウム、酸化マンガン、酸化鉄、酸化チタン、酸化マグネシウム、酸化ジルコニウムおよび酸化タンタルからなる群から選ばれる少なくとも一つであり、
前記化合物(b)が、グルカミン、N-メチルグルカミンおよびN-エチルグルカミンからなる群から選ばれる少なくとも一つである、
前記[2]の化学機械研磨用スラリー。
[14] 前記砥粒(a)が、酸化セリウムである前記[13]の化学機械研磨用スラリー。
[15] 前記化合物(b)が、N-メチルグルカミンおよびN-エチルグルカミンからなる群から選ばれる少なくとも一つである前記[13]または[14]の化学機械研磨用スラリー。
[16] 前記砥粒(a)の濃度が、0.2~5質量%である前記[13]~[15]のいずれかの化学機械研磨用スラリー。
[17] 前記化合物(b)の濃度が、0.004~0.4質量%である前記[13]~[16]のいずれかの化学機械研磨用スラリー。
[18] さらに、重量平均分子量が2,500~100,000であるポリアクリル酸、ポリビニルピロリドンおよびプルランからなる群から選ばれる少なくとも一つである水溶性重合体(c)を0.001~5質量%の濃度で含有する前記[13]~[17]のいずれかの化学機械研磨用スラリー。
[19] 前記水溶性重合体(c)の濃度が、0.01~1質量%である前記[18]の化学機械研磨用スラリー。
[20] さらに、N-(2-ヒドロキシエチル)エチレンジアミン-N,N’,N’-三酢酸、エチレンジアミン-N,N,N’,N’-四酢酸、およびジエチレントリアミン-N,N,N’,N”,N”-五酢酸からなる群から選ばれる少なくとも一つである化合物(d)を0.0001~1質量%の濃度で含有する前記[13]~[19]のいずれかの化学機械研磨用スラリー。
[21] 前記化合物(d)が、エチレンジアミン-N,N,N’,N’-四酢酸である前記[20]の化学機械研磨用スラリー。
[22] 前記化合物(d)の濃度が、0.01~0.2質量%である前記[20]または[21]の化学機械研磨用スラリー。
[23] pHが3~11である、前記[1]~[22]のいずれかの化学機械研磨用スラリー。
[24] 前記[1]~[23]のいずれかの化学機械研磨用スラリーを用いて絶縁膜を研磨する、化学機械研磨方法。
[25] 浅溝素子分離を形成するために用いられる、前記[24]の化学機械研磨方法。
砥粒(a)としては、任意の無機化合物、有機化合物、有機-無機複合材料を用いることができ、例えば、酸化セリウム、酸化マンガン、酸化鉄、酸化チタン、酸化マグネシウム、酸化ジルコニウム、酸化タンタル、酸化ケイ素、酸化アルミニウム、酸化スズ、ダイヤモンド、フラーレンおよびポリスチレンなどが挙げられる。砥粒(a)は、酸化セリウム、酸化マンガン、酸化鉄、酸化チタン、酸化マグネシウム、酸化ジルコニウムおよび酸化タンタルからなる群から選ばれる少なくとも一つであることが、研磨速度が高く、研磨傷の低減に優れることから好ましい。さらには、平坦化性能が一層優れることから、砥粒(a)として、酸化セリウムが特に好ましい。なお、砥粒(a)は1種のみを使用してもよく、2種以上を併用してもよい。
化合物(b)は、酸解離定数(Ka)の逆数の常用対数であるpKaが9より大きいアミノ基および3個以上の水酸基を有する化合物である。化合物(b)のアミノ基のpKaが9より大きいことにより、CMP用スラリーの平坦化性能が著しく向上する。化合物(b)のアミノ基のpKaは、9.1~11であることがより好ましく、9.2~10.5であることがさらに好ましく、9.3~10であることが特に好ましい。なお、本発明において、化合物(b)のアミノ基のpKaは水中での20℃における値を示す。かかるpKaの値は、電位差滴定法により求めることができる。なお、本明細書において、アミノ基のpKaとは「アミノ基の共役酸のpKa」を示す。化合物(b)を用いる本発明のCMP用スラリーが優れた効果を奏するメカニズムとしては、以下のようなものが考えられる。化合物(b)のアミノ基のpKaが上記範囲であることにより、水中でプロトン化されたアミノ基(即ち、アミノ基の共役酸)の求電子性とアミノ基の求核性とのバランスが良好になる。その結果、化合物(b)の被研磨膜への吸着強度が適度となって、通常の研磨条件においてパターン凸部やパターンのない膜への低い吸着性とパターン凹部への高い吸着性とを高い次元で両立できる。そのため、本発明のCMP用スラリーを用いれば、特定のパターンにおいて顕著な平坦化性能を示すのみでなく、寸法や密度が異なる複数のパターンを凸部凹部ともに均一に、且つ極めて小さい段差で、しかも不要な膜を残すことなく短時間で平坦化することができる。但し、本発明はこのような推定メカニズムに限定されない。
本発明のCMP用スラリーは、任意成分として、水溶性重合体(c)(以下「重合体(c)」と略称することがある)をさらに含有していてもよい。重合体(c)は、いずれも、1種のみを使用してもよく、2種以上を併用してもよい。
(メタ)アクリル酸、マレイン酸、イタコン酸およびビニルピロリドンからなる群から選ばれる少なくとも一つの単量体25~100質量%と、不飽和二重結合を有するその他の単量体(例えば(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリルアミド、N,N-ジメチル(メタ)アクリルアミド、スチレン、メチルビニルエーテル、ビニルピロリドン、エチレン、プロピレン、ブタジエン等)75~0質量%とを重合して得られた水溶性重合体(c1);
加水分解によりビニルアルコール骨格となる単量体(例えば、酢酸ビニル、プロピオン酸ビニル、酪酸ビニル、ビバリン酸ビニル、カプロン酸ビニル等)50~100質量%と、不飽和二重結合を有するその他の単量体(例えば(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリルアミド、N,N-ジメチル(メタ)アクリルアミド、スチレン、メチルビニルエーテル、ビニルピロリドン、エチレン、プロピレン、ブタジエン等)50~0質量%とを重合した後に加水分解して得られた水溶性重合体(c2);
水溶性多糖類(c3)(例えば、デキストリン、デキストラン、プルラン、イヌリン、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース等);
カルボキシ基および/またはポリオキシエチレン基を有する水溶性ポリウレタン(c4)(例えば、ジメチロールプロピオン酸、ジメチロールブタン酸、アミノ酪酸、アミノカプロン酸等のカルボキシ基含有化合物および/またはポリエチレングリコールと、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート等のジイソシアネート化合物とを反応して得られた重合体);および
それらの水溶性誘導体(c5)(例えば、上記(c1)~(c4)のカルボキシ基の少なくとも一部をエステル化した水溶性重合体、上記(c1)~(c4)の水酸基の少なくとも一部をエステル化した水溶性重合体、上記(c1)~(c4)の水酸基の少なくとも一部をアルキルエーテル化した水溶性重合体)
からなる群から選ばれる少なくとも一つである。
本発明において「(メタ)アクリル酸」等とは「メタクリル酸およびアクリル酸」等を意味し、「(メタ)アクリルアミド」等とは「メタクリルアミドおよびアクリルアミド」等を意味する。
また、本発明において「ポリオキシエチレン基」とは、4個以上(好ましくは4~200個、より好ましくは8~100個)のオキシエチレン基(-OC2H4-)が結合した基を意味する。
(メタ)アクリル酸、マレイン酸、イタコン酸およびビニルピロリドンからなる群から選ばれる少なくとも一つの単量体25~100質量%と、不飽和二重結合を有するその他の単量体75~0質量%とを重合して得られた水溶性重合体(c1);
デキストランおよびプルランからなる群から選ばれる少なくとも一つの水溶性多糖類(c6);および
それらの誘導体(c7)(例えば、上記(c1)または(c6)のカルボキシ基の少なくとも一部をエステル化した水溶性重合体、上記(c1)または(c6)の水酸基の少なくとも一部をエステル化した水溶性重合体、上記(c1)または(c6)の水酸基の少なくとも一部をアルキルエーテル化した水溶性重合体)
からなる群から選ばれる少なくとも一つである。このような重合体(c)は、研磨速度と平坦化性能の向上効果が特に高く、砥粒(a)および化合物(b)との併用で相乗効果を発揮する。
化合物(d)を含有させることにより、CMP用スラリーの平坦化性能とパターン均一性能をさらに向上することができる。ここで、本発明におけるパターン均一性能とは、異なるウェハパターンの研磨量のばらつきを抑えることができる能力を意味する。化合物(d)が有するカルボキシ基は、一部または全てが塩の形態であってもよい。
株式会社堀場製作所製pHメーター「F-22」を用い、標準緩衝液(フタル酸塩pH緩衝液:pH4.00(25℃)、中性リン酸塩pH緩衝液:pH7.00(25℃)、ホウ酸塩pH緩衝液:pH9.00(25℃))を用いて3点校正した後、CMP用スラリーのpHを25℃に調温した状態で測定した。
ナノメトリクス社製膜厚測定装置「Nanospec Model5100」を用い、倍率10の対物レンズで酸化ケイ素および窒化ケイ素の膜厚を測定した。
株式会社ミツトヨ製表面粗さ測定機「SJ-400」を用い、標準スタイラス、測定レンジ 80μm、JIS2001、GAUSSフィルタ、カットオフ値λc 2.5mm、およびカットオフ値λs 8.0μmの設定で測定を行い、断面曲線からパターンウェハの段差を求めた。
ニッタ・ハース社製研磨パッド「IC1400(同心円溝);直径380mm」を株式会社エム・エー・ティー製研磨装置「BC-15」の研磨定盤に貼り付け、株式会社アライドマテリアル製ダイヤモンドドレッサー(ダイヤ番手#100;直径190mm)を用い、純水を150mL/分の速度で流しながらドレッサー回転数140rpm、研磨パッド回転数100rpm、ドレッサー荷重5Nにて60分間研磨パッド表面を研削した(以下「コンディショニング」と称する)。
パターン(i):凸部幅100μmおよび凹部幅100μmのパターン
パターン(ii):凸部幅50μmおよび凹部幅50μmのパターン
パターン(iii):凸部幅500μmおよび凹部幅500μmのパターン
パターン(iv):凸部幅70μmおよび凹部幅30μmのパターン
パターン(v):凸部幅30μmおよび凹部幅70μmのパターン
また、過剰研磨後の各パターンでの膜厚の差が小さい方が、パターン形状によらず均一に研磨されているため好ましい。
また、パターン(ii)およびパターン(iii)の凹部の膜厚差(即ち、[パターン(ii)の凹部膜厚]-[パターン(iii)の凹部膜厚])を「パターン寸法依存性能」として評価し、パターン(iv)およびパターン(v)の凹部の膜厚差(即ち、[パターン(iv)の凹部膜厚]-[パターン(v)の凹部膜厚])を「パターン密度依存性能」として評価した。いずれも、値が小さい方が好ましい。
酸化セリウム砥粒(昭和電工株式会社製研磨剤「GPL-C1010」、原液濃度10質量%、平均粒径200nm)50g、N-メチルグルカミン(和光純薬工業株式会社製)0.5g、ポリアクリル酸(和光純薬工業株式会社製、重量平均分子量5,000)2.5gおよび純水900gを均一に混合した後、28質量%アンモニア水(和光純薬工業株式会社製)および純水を加えてpHが5.0のCMP用スラリー1000gを調製した。該スラリー中の砥粒(a)(酸化セリウム砥粒)の濃度は0.5質量%、化合物(b)(N-メチルグルカミン)の濃度は0.05質量%、重合体(c)(ポリアクリル酸)の濃度は0.25質量%である。
CMP用スラリーの成分および濃度を表1に示したように変更した以外は、実施例1と同様にしてCMP用スラリーを調製した。スラリーのpHは表1に示したとおりであり、アンモニア水または塩酸により調整した。
CMP用スラリーの成分および濃度を表3に示したように変更した以外は、実施例1と同様にしてCMP用スラリーを調製した。スラリーのpHは表3に示したとおりであり、アンモニア水または塩酸により調整した。
CMP用スラリーの成分および濃度を表5に示したように変更した以外は、実施例1と同様にしてCMP用スラリーを調製した。スラリーのpHは表5に示したとおりであり、アンモニア水または塩酸により調整した。
2 酸化絶縁膜(酸化ケイ素など)
3 ストップ膜(窒化ケイ素など)
4 溝
5 絶縁膜(酸化ケイ素など)
6 STI領域
h 段差
t 絶縁膜の膜厚
Claims (15)
- 砥粒(a)と、
pKaが9より大きいアミノ基、および3個以上の水酸基を有する化合物(b)と、
水と
を含有する化学機械研磨用スラリー。 - 化学機械研磨用スラリー中、
前記砥粒(a)の濃度が0.1~20質量%であり、
前記化合物(b)の濃度が0.001~1質量%である、
請求項1に記載の化学機械研磨用スラリー。 - 前記砥粒(a)が酸化セリウム、酸化マンガン、酸化鉄、酸化チタン、酸化マグネシウム、酸化ジルコニウムおよび酸化タンタルからなる群から選ばれる少なくとも一つである、請求項1または2に記載の化学機械研磨用スラリー。
- 前記化合物(b)のアミノ基のpKaが9.2~10.5である、請求項1~3のいずれか一項に記載の化学機械研磨用スラリー。
- 前記化合物(b)のアミノ基の数が1である、請求項1~4のいずれか一項に記載の化学機械研磨用スラリー。
- 前記化合物(b)の分子量が100~1000である、請求項1~5のいずれか一項に記載の化学機械研磨用スラリー。
- 前記化合物(b)が、グルカミンおよび/またはその誘導体である、請求項1~6のいずれか一項に記載の化学機械研磨用スラリー。
- さらに、水溶性重合体(c)を0.001~5質量%の濃度で含有する、請求項1~7のいずれか一項に記載の化学機械研磨用スラリー。
- 前記水溶性重合体(c)が、アニオン性重合体および/または非イオン性重合体である、請求項8に記載の化学機械研磨用スラリー。
- 前記水溶性重合体(c)が、
(メタ)アクリル酸、マレイン酸、イタコン酸およびビニルピロリドンからなる群から選ばれる少なくとも一つの単量体25~100質量%と、不飽和二重結合を有するその他の単量体75~0質量%とを重合して得られた水溶性重合体(c1);
加水分解によりビニルアルコール骨格を形成する単量体50~100質量%と、不飽和二重結合を有するその他の単量体50~0質量%とを重合した後に加水分解して得られた水溶性重合体(c2);
水溶性多糖類(c3);
カルボキシ基および/またはポリオキシエチレン基を有する水溶性ポリウレタン(c4);および
それらの水溶性誘導体(c5)
からなる群から選ばれる少なくとも一つである、請求項8または9に記載の化学機械研磨用スラリー。 - 前記化合物(d)が、イミノ二酢酸、N-(2-ヒドロキシエチル)イミノ二酢酸、アスパラギン酸-N,N-二酢酸、ニトリロ三酢酸、N-(2-ヒドロキシエチル)エチレンジアミン-N,N’,N’-三酢酸、エチレンジアミン-N,N,N’,N’-四酢酸、プロピレンジアミン-N,N,N’,N’-四酢酸、グリコールエーテルジアミン-N,N,N’,N’-四酢酸、1,2-ジアミノシクロヘキサン-N,N,N’,N’-四酢酸、ジエチレントリアミン-N,N,N’,N”,N”-五酢酸、トリエチレンテトラミン-N,N,N’,N”,N'”,N'”-六酢酸、3-ヒドロキシ-2,2’-イミノジコハク酸、およびエチレンジアミンジコハク酸からなる群から選ばれる少なくとも一つである、請求項11に記載の化学機械研磨用スラリー。
- pHが3~11である、請求項1~12のいずれか一項に記載の化学機械研磨用スラリー。
- 請求項1~13のいずれか一項に記載の化学機械研磨用スラリーを用いて絶縁膜を研磨する、化学機械研磨方法。
- 浅溝素子分離を形成するために用いられる、請求項14に記載の化学機械研磨方法。
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US9437446B2 (en) | 2016-09-06 |
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