WO2020021729A1 - スラリ及び研磨方法 - Google Patents
スラリ及び研磨方法 Download PDFInfo
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- WO2020021729A1 WO2020021729A1 PCT/JP2018/035438 JP2018035438W WO2020021729A1 WO 2020021729 A1 WO2020021729 A1 WO 2020021729A1 JP 2018035438 W JP2018035438 W JP 2018035438W WO 2020021729 A1 WO2020021729 A1 WO 2020021729A1
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- particles
- mass
- slurry
- polishing
- abrasive grains
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C09K3/1436—Composite particles, e.g. coated particles
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P74/00—Testing or measuring during manufacture or treatment of wafers, substrates or devices
- H10P74/23—Testing or measuring during manufacture or treatment of wafers, substrates or devices characterised by multiple measurements, corrections, marking or sorting processes
- H10P74/238—Testing or measuring during manufacture or treatment of wafers, substrates or devices characterised by multiple measurements, corrections, marking or sorting processes comprising acting in response to an ongoing measurement without interruption of processing, e.g. endpoint detection or in-situ thickness measurement
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/06—Planarisation of inorganic insulating materials
- H10P95/062—Planarisation of inorganic insulating materials involving a dielectric removal step
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/85—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by XPS, EDX or EDAX data
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
Definitions
- the present invention relates to a slurry and a polishing method.
- a CMP (Chemical Mechanical Polishing) technique which is one of the processing techniques, forms a shallow trench isolation (shallow trench isolation; hereinafter, referred to as "STI") in a semiconductor device manufacturing process. It is an indispensable technique for flattening a premetal insulating material or an interlayer insulating material, forming a plug or a buried metal wiring, and the like.
- the most frequently used polishing liquid is, for example, a silica-based polishing liquid containing silica (silicon oxide) particles such as fumed silica and colloidal silica as abrasive grains.
- the silica-based polishing liquid is characterized by being highly versatile, and can appropriately polish a wide variety of materials irrespective of insulating materials and conductive materials by appropriately selecting the abrasive content, pH, additives, and the like.
- a polishing liquid mainly for an insulating material such as silicon oxide the demand for a polishing liquid containing cerium compound particles as abrasive grains is also increasing.
- a cerium oxide-based polishing liquid containing cerium oxide particles as abrasive grains can polish silicon oxide at high speed even with a lower abrasive content than a silica-based polishing liquid (for example, see Patent Documents 1 and 2 below).
- the step of the insulating material at the time of forming the cell is several times higher than that of the conventional planar type. Accordingly, in order to maintain the device manufacturing throughput, it is necessary to quickly eliminate the high steps as described above in the CMP process or the like, and it is necessary to improve the polishing rate of the insulating material.
- the present invention has been made to solve the above problems, and has as its object to provide a slurry capable of improving a polishing rate of an insulating material, and a polishing method using the slurry.
- a slurry according to one aspect of the present invention includes abrasive grains and a liquid medium, wherein the abrasive grains include first particles and second particles in contact with the first particles,
- the second particles include at least one metal compound selected from the group consisting of metal oxides and metal hydroxides, the metal compound includes a metal that can have a plurality of valences, Is the smallest valence in X-ray photoelectron spectroscopy of 0.10 or more.
- the polishing rate of the insulating material can be improved, and the insulating material can be polished at a high polishing rate.
- a polishing method includes a step of polishing a surface to be polished using the slurry. According to such a polishing method, the same effect as that of the slurry can be obtained by using the slurry.
- the present invention it is possible to provide a slurry capable of improving a polishing rate of an insulating material, and a polishing method using the slurry.
- a slurry for polishing a surface to be polished including an insulating material it is possible to provide the use of the slurry in the step of flattening the surface of the substrate, which is a technique for manufacturing a semiconductor device. According to the present invention, it is possible to provide the use of the slurry in the step of planarizing an STI insulating material, a pre-metal insulating material or an interlayer insulating material.
- a numerical range indicated by using “to” indicates a range including numerical values described before and after “to” as a minimum value and a maximum value, respectively.
- the upper limit or the lower limit of a numerical range in one step can be arbitrarily combined with the upper limit or the lower limit of a numerical range in another step.
- the upper limit or the lower limit of the numerical range may be replaced with the value shown in the embodiment.
- “A or B” may include one of A and B, and may include both.
- the materials exemplified in the present specification can be used alone or in combination of two or more, unless otherwise specified.
- the content of each component in the composition if there are a plurality of substances corresponding to each component in the composition, unless otherwise specified, the total amount of the plurality of substances present in the composition Means
- step is included in the term as well as an independent step, even if it is not clearly distinguishable from other steps, provided that the intended action of that step is achieved.
- the slurry according to the present embodiment contains abrasive grains.
- the abrasive grains are also referred to as “abrasive particles”, but are referred to herein as “abrasive grains”.
- Abrasive grains are generally solid particles, and are removed by a mechanical action (physical action) of the abrasive grains during polishing and a chemical action of the abrasive grains (mainly, the surface of the abrasive grains). It is contemplated, but not limited to, that the object is removed.
- the polishing rate when the slurry according to the present embodiment is used is, for example, the polishing rate obtained when the content of abrasive grains (total amount of particles) is adjusted to 0.1% by mass based on the total mass of the slurry. Can be compared based on
- polishing liquid (abrasive) is defined as a composition that comes into contact with a surface to be polished during polishing.
- polishing liquid itself does not limit the components contained in the polishing liquid at all.
- the weight average molecular weight in the present specification can be measured, for example, by gel permeation chromatography (GPC) using a standard polystyrene calibration curve under the following conditions.
- Equipment used Hitachi L-6000 type [manufactured by Hitachi, Ltd.]
- Flow rate 1.75 mL / min
- Detector L-3300RI [manufactured by Hitachi, Ltd.]
- the slurry according to the present embodiment contains abrasive grains and a liquid medium as essential components.
- the slurry according to the present embodiment can be used, for example, as a polishing liquid (CMP polishing liquid).
- Abrasive grains contain composite particles including first particles and second particles in contact with the first particles.
- the second particles include at least one metal compound selected from the group consisting of a metal oxide and a metal hydroxide, and the metal compound includes a metal that can have a plurality of valences (valences).
- the ratio of the smallest valence among the plurality of valences of the metal is 0.10 or more in X-ray photoelectron spectroscopy (XPS: X-ray @ Photoelectron @ Spectroscopy).
- the polishing rate of the insulating material (for example, silicon oxide) can be improved.
- the reason why the polishing rate of the insulating material is improved in this manner is as follows, for example, with silicon oxide as an example. However, the reason is not limited to the following.
- the first step in which metal atoms in abrasive grains and silicon atoms of silicon oxide are bonded via oxygen atoms (for example, when the metal atoms are cerium, Ce—O—Si bonding Is generated), and the silicon atoms are removed from the surface to be polished by cutting the bonds between the silicon atoms and other oxygen atoms on the surface to be polished while maintaining the bond of metal atom-oxygen atom-silicon atom.
- a second stage occurs. When the abrasive grains come into contact with silicon oxide, the first stage is more likely to proceed as the ratio of the smallest valence among the valences of the metal in the abrasive grains increases. Easy to progress.
- the first stage is likely to proceed, and thus the silicon oxide Polishing easily proceeds as a whole. As described above, the polishing rate of silicon oxide is improved.
- the abrasive grains of the slurry according to the present embodiment contain composite particles including the first particles and the second particles in contact with the first particles.
- the second particles include at least one metal compound selected from the group consisting of a metal oxide and a metal hydroxide, and the metal compound has a plurality of valences (hereinafter, referred to as “metal M”). including. That is, the second particles include at least one selected from the group consisting of an oxide containing the metal M and a hydroxide containing the metal M.
- the smallest valence ratio among the plurality of valences of the metal M is 0.10 or more in X-ray photoelectron spectroscopy from the viewpoint of improving the polishing rate of the insulating material.
- the valence ratio is a ratio when the total amount (total atoms) of the metal M is 1, and is a ratio (unit: at%) of the number of atoms having the target valence.
- the valence ratio can be measured by the method described in Examples.
- the peak position of the X-ray photoelectron spectroscopy spectrum differs depending on the valence due to the chemical shift. On the other hand, the number of atoms in each peak is proportional to the peak area.
- Examples of a method for adjusting the valence of the metal M include a method of performing an oxidation treatment or a reduction treatment on the abrasive grains.
- Examples of the oxidizing method include a method of treating abrasive grains with a reagent having an oxidizing effect; and a method of performing high-temperature treatment in air or in an oxygen atmosphere.
- Examples of the method of the reduction treatment include a method of treating abrasive grains with a reagent having a reducing action; and a method of performing high-temperature treatment in a reducing atmosphere such as hydrogen.
- the metal M may have multiple valences. The smallest valence may be, for example, trivalent.
- the valence ratio is preferably 0.12 or more, more preferably 0.14 or more, further preferably 0.15 or more, and particularly preferably 0.16 or more, from the viewpoint of further improving the polishing rate of the insulating material.
- the valence ratio is preferably 0.50 or less from the viewpoint of further improving the polishing rate of the insulating material.
- the particle size of the second particles is preferably smaller than the particle size of the first particles.
- the magnitude relationship between the particle diameters of the first particles and the second particles can be determined from an SEM image or the like of the composite particles.
- particles having a small particle diameter have a higher surface activity per unit mass than particles having a large particle diameter, and thus have high reaction activity.
- the mechanical action (mechanical polishing force) of particles having a small particle size is smaller than that of particles having a large particle size.
- even when the particle size of the second particles is smaller than the particle size of the first particles, it is possible to exhibit a synergistic effect between the first particles and the second particles. It is possible to easily achieve both excellent reaction activity and mechanical action.
- the lower limit of the particle diameter of the first particles is preferably 15 nm or more, more preferably 25 nm or more, still more preferably 35 nm or more, particularly preferably 40 nm or more, and most preferably 50 nm or more, from the viewpoint of further improving the polishing rate of the insulating material.
- 80 nm or more is very preferable, and 100 nm or more is still more preferable.
- the upper limit of the particle diameter of the first particles is preferably 1,000 nm or less, more preferably 800 nm or less, and 600 nm or less, from the viewpoint of improving the dispersibility of the abrasive grains, and from the viewpoint that scratches on the surface to be polished are easily suppressed.
- the particle diameter of the first particles is more preferably 15 to 1000 nm.
- the average particle size (average secondary particle size) of the first particles may be in the above range.
- the lower limit of the particle size of the second particles is preferably 1 nm or more, more preferably 2 nm or more, and still more preferably 3 nm or more, from the viewpoint of further improving the polishing rate of the insulating material.
- the upper limit of the particle size of the second particles is preferably 50 nm or less, more preferably 30 nm or less, and 25 nm from the viewpoint that the dispersibility of the abrasive grains is improved and that the surface to be polished is easily suppressed from being damaged.
- the thickness is particularly preferably 20 nm or less, particularly preferably 15 nm or less, and very preferably 10 nm or less. From the above viewpoint, the particle size of the second particles is more preferably 1 to 50 nm.
- the average particle size (average secondary particle size) of the second particles may be in the above range.
- the average particle size (average secondary particle size) of the abrasive grains (the entire abrasive grains including composite particles and free particles) in the slurry is preferably in the following range.
- the lower limit of the average particle size of the abrasive grains is preferably 16 nm or more, more preferably 20 nm or more, still more preferably 30 nm or more, particularly preferably 40 nm or more, and most preferably 50 nm or more, from the viewpoint of further improving the polishing rate of the insulating material. , 100 nm or more is very preferable, 120 nm or more is more preferable, and 140 nm or more is further preferable.
- the upper limit of the average particle size of the abrasive grains is preferably 1050 nm or less, more preferably 1000 nm or less, and 800 nm or less, from the viewpoint of improving the dispersibility of the abrasive grains and from the viewpoint that the surface to be polished is easily suppressed from being damaged.
- the average particle diameter of the abrasive grains is more preferably 16 to 1050 nm.
- the average particle size is measured using, for example, a light diffraction scattering type particle size distribution meter (for example, trade name: N5, manufactured by Beckman Coulter, Inc., or Microtrac Bell, Inc., trade name: Microtrac MT3300EXII). can do.
- a light diffraction scattering type particle size distribution meter for example, trade name: N5, manufactured by Beckman Coulter, Inc., or Microtrac Bell, Inc., trade name: Microtrac MT3300EXII.
- the zeta potential of the abrasive grains in the slurry is preferably in the following range.
- the zeta potential of the abrasive grains is preferably at least +10 mV, more preferably at least +20 mV, still more preferably at least +25 mV, particularly preferably at least +30 mV, particularly preferably at least +40 mV, particularly preferably at least +40 mV, from the viewpoint of further improving the polishing rate of the insulating material. Is highly preferred.
- the upper limit of the zeta potential of the abrasive grains is not particularly limited, and is, for example, +200 mV or less.
- the first particles can have a negative zeta potential.
- the second particles can have a positive zeta potential.
- the zeta potential indicates the surface potential of the particles.
- the zeta potential can be measured using, for example, a dynamic light scattering zeta potential measuring device (for example, trade name: DelsaNano @ C, manufactured by Beckman Coulter, Inc.).
- the zeta potential of the particles can be adjusted using additives. For example, by bringing a monocarboxylic acid (for example, acetic acid) into contact with particles containing cerium oxide, particles having a positive zeta potential can be obtained. Further, particles having a negative zeta potential can be obtained by bringing ammonium dihydrogen phosphate, a material having a carboxyl group (eg, polyacrylic acid) or the like into contact with particles containing cerium oxide.
- a monocarboxylic acid for example, acetic acid
- particles having a positive zeta potential can be obtained.
- particles having a negative zeta potential can be obtained by bringing ammonium dihydrogen phosphat
- the first particles are silicon (Si), vanadium (V), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), and copper (Ni) from the viewpoint of further improving the polishing rate of the insulating material.
- Cu silver (Ag), indium (In), tin (Sn), rare earth element (rare earth metal element), tungsten (W), and at least one metal selected from the group consisting of bismuth (Bi) (Referred to as “metal m”).
- the metal m preferably contains at least one selected from the group consisting of scandium (Sc) and lanthanoids as a rare earth element from the viewpoint of further improving the polishing rate of the insulating material.
- the metal m is selected from the group consisting of cerium (Ce), praseodymium (Pr), europium (Eu), terbium (Tb), and ytterbium (Yb) as lanthanoids from the viewpoint of further improving the polishing rate of the insulating material. It is preferable to include at least one of these.
- the metal m preferably contains a rare earth element, more preferably contains a lanthanoid, and further preferably contains cerium, from the viewpoint of further improving the polishing rate of the insulating material.
- the first particles may contain an organic compound, and may contain a high molecular compound (polymer).
- polymer compound include polystyrene, polyphenylene sulfide, polyamide imide, epoxy resin, polyvinylidene fluoride, polyethylene terephthalate, polybutylene terephthalate, polyester, polyether sulfone, polylactic acid, ethyl cellulose resin, and acrylic resin.
- the metal M of the second particles preferably contains a rare earth metal, more preferably contains a lanthanoid, and further preferably contains cerium.
- a rare earth metal more preferably contains a lanthanoid, and further preferably contains cerium.
- cerium at least one selected from the group consisting of cerium, praseodymium, europium, terbium, ytterbium, and lutetium can be used.
- the second particles preferably contain a metal hydroxide, and more preferably contain a hydroxide containing cerium (cerium hydroxide), from the viewpoint of further improving the polishing rate of the insulating material.
- Abrasive grains containing cerium hydroxide have a higher reactivity (chemical action) with an insulating material (eg, silicon oxide) due to the action of a hydroxyl group than particles made of silica, cerium oxide, and the like. Polishing can be performed at a higher polishing rate.
- Cerium hydroxide is, for example, a compound containing cerium ions and at least one hydroxide ion (OH ⁇ ).
- Cerium hydroxide may include anions other than hydroxide ions (eg, nitrate ions NO 3 ⁇ and sulfate ions SO 4 2 ⁇ ).
- cerium hydroxide may include anions (eg, nitrate ions NO 3 ⁇ and sulfate ions SO 4 2 ⁇ ) bonded to cerium ions.
- Cerium hydroxide can be produced by reacting a cerium salt with an alkali source (base).
- Cerium hydroxide can be prepared by mixing a cerium salt and an alkaline liquid (eg, an alkaline aqueous solution).
- Cerium hydroxide can be obtained by mixing a cerium salt solution (for example, a cerium salt aqueous solution) and an alkali solution.
- the cerium salt include Ce (NO 3 ) 4 , Ce (SO 4 ) 2 , Ce (NH 4 ) 2 (NO 3 ) 6 , Ce (NH 4 ) 4 (SO 4 ) 4 and the like.
- Ce (OH) a X b the reactivity of hydroxide ions is improved by the action of an electron-withdrawing anion (X c ⁇ ), and the abundance of Ce (OH) a X b increases. It is thought that the polishing rate increases with the increase in the polishing rate.
- Examples of the anion (X c ⁇ ) include NO 3 — and SO 4 2- . It is thought that the particles containing cerium hydroxide may include not only Ce (OH) a Xb but also Ce (OH) 4 , CeO 2 and the like.
- the fact that the particles containing cerium hydroxide contain Ce (OH) a Xb is based on the fact that the particles are thoroughly washed with pure water and then the FT-IR ATR method (Fourier transform Infra Red Spectrometer Attenuated Total Reflection method, Fourier transform method) It can be confirmed by a method of detecting a peak corresponding to an anion (X c ⁇ ) by a spectrophotometer total reflection measurement method). X-ray photoelectron spectroscopy can also confirm the presence of an anion (X c ⁇ ).
- the second particles are smaller than the first particles, and the first particles are cerium oxide.
- the second particles preferably contain at least one cerium compound selected from the group consisting of cerium oxide and cerium hydroxide.
- the first particles containing cerium oxide and having a larger particle size than the second particles have stronger mechanical action (mechanical properties) on the insulating material than the second particles.
- the second particles containing the cerium compound and having a smaller particle size than the first particles have a smaller mechanical action on the insulating material than the first particles, but have a specific surface area of the whole particles. Since the surface area per unit mass is large, the chemical action (chemical properties) on the insulating material is strong. As described above, by using the first particles having a strong mechanical action and the second particles having a strong chemical action together, a synergistic effect of improving the polishing rate is easily obtained.
- the composite particles including the first particles and the second particles are brought into contact with the first particles and the second particles using a homogenizer, a nanomizer, a ball mill, a bead mill, an ultrasonic treatment machine, or the like, and the charges opposite to each other are used.
- a homogenizer a nanomizer, a ball mill, a bead mill, an ultrasonic treatment machine, or the like.
- the lower limit of the content of cerium oxide in the first particles is based on the entire first particles (the entire first particles contained in the slurry; the same applies hereinafter) from the viewpoint of further improving the polishing rate of the insulating material. Is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass or more.
- the first particles may be in an aspect substantially composed of cerium oxide (an aspect in which 100% by mass of the first particles is cerium oxide).
- the lower limit of the content of the cerium compound in the second particles is based on the entire second particles (the entire second particles contained in the slurry; the same applies hereinafter) from the viewpoint of further improving the polishing rate of the insulating material. , 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass or more.
- the second particles may have an aspect substantially composed of a cerium compound (an aspect in which substantially 100% by mass of the second particles is a cerium compound).
- the lower limit of the content of the first particles in the abrasive grains is 50% by mass or more based on the entire abrasive grains (the entirety of the abrasive grains contained in the slurry.
- it is more preferably more than 50% by mass, still more preferably 60% by mass or more, particularly preferably 70% by mass or more, very preferably 75% by mass or more, very preferably 80% by mass or more, and 85% by mass or more. Even more preferred is 90% by mass or more.
- the upper limit of the content of the first particles in the abrasive grains is preferably 95% by mass or less, more preferably 93% by mass or less, and more preferably 91% by mass, based on the entire abrasive particles, from the viewpoint of further improving the polishing rate of the insulating material. % Is more preferable. From the above viewpoint, the content of the first particles in the abrasive grains is more preferably 50 to 95% by mass based on the entire abrasive grains.
- the lower limit of the content of the second particles in the abrasive grains is preferably 5% by mass or more based on the entire abrasive grains (the entire abrasive grains contained in the slurry). It is more preferably at least 9 mass%, further preferably at least 9 mass%.
- the upper limit of the content of the second particles in the abrasive grains is preferably 50% by mass or less, more preferably less than 50% by mass, and more preferably 40% by mass, based on the entire abrasive particles, from the viewpoint of further improving the polishing rate of the insulating material.
- the content of the second particles in the abrasive grains is more preferably 5 to 50% by mass based on the entire abrasive grains.
- the lower limit of the cerium oxide content in the abrasive grains is preferably 50% by mass or more, and more preferably 50% by mass, based on the entire abrasive grains (the entire abrasive grains contained in the slurry) from the viewpoint of further improving the polishing rate of the insulating material.
- % More preferably 60% by mass or more, particularly preferably 70% by mass or more, particularly preferably 75% by mass or more, very preferably 80% by mass or more, even more preferably 85% by mass or more. 90 mass% or more is more preferable.
- the upper limit of the content of cerium oxide in the abrasive grains is preferably 95% by mass or less, more preferably 93% by mass or less, and more preferably 91% by mass, based on the whole abrasive particles, from the viewpoint of further improving the polishing rate of the insulating material.
- the following are more preferred.
- the content of cerium oxide in the abrasive grains is more preferably 50 to 95% by mass based on the entire abrasive grains.
- the lower limit of the content of cerium hydroxide in the abrasive grains is preferably 5% by mass or more based on the entire abrasive grains (the entire abrasive grains contained in the slurry) from the viewpoint of further improving the polishing rate of the insulating material. It is more preferably at least 9 mass%, further preferably at least 9 mass%.
- the upper limit of the content of cerium hydroxide in the abrasive grains is preferably 50% by mass or less, more preferably less than 50% by mass, and more preferably 40% by mass, based on the whole abrasive particles, from the viewpoint of further improving the polishing rate of the insulating material.
- the content of cerium hydroxide in the abrasive grains is more preferably 5 to 50% by mass based on the entire abrasive grains.
- the lower limit of the content of the first particles is preferably 50% by mass or more, and more preferably 50% by mass, based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of the insulating material. More preferably, it is more preferably 60% by mass or more, particularly preferably 70% by mass or more, particularly preferably 75% by mass or more, very preferably 80% by mass or more, still more preferably 85% by mass or more, and 90% by mass. % Or more is more preferable. From the viewpoint of further improving the polishing rate of the insulating material, the upper limit of the content of the first particles is preferably 95% by mass or less, and more preferably 93% by mass or less, based on the total amount of the first particles and the second particles. Is more preferable, and 91 mass% or less is still more preferable. From the above viewpoint, the content of the first particles is more preferably 50 to 95% by mass based on the total amount of the first particles and the second particles.
- the lower limit of the content of the second particles is preferably 5% by mass or more, more preferably 7% by mass or more based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of the insulating material. Is more preferable, and 9 mass% or more is further preferable.
- the upper limit of the content of the second particles is preferably 50% by mass or less, and less than 50% by mass, based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of the insulating material. Is more preferably 40% by mass or less, further preferably 30% by mass or less, particularly preferably 20% by mass or less, and very preferably 10% by mass or less. From the above viewpoint, the content of the second particles is more preferably 5 to 50% by mass based on the total amount of the first particles and the second particles.
- the lower limit of the content of the first particles in the slurry is preferably 0.005% by mass or more, more preferably 0.008% by mass or more based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of the insulating material. It is preferably at least 0.01% by mass, more preferably at least 0.05% by mass, particularly preferably at least 0.07% by mass, and most preferably at least 0.08% by mass.
- the upper limit of the content of the first particles in the slurry is 5% by mass or less based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of the insulating material and increasing the storage stability of the slurry.
- the content of the first particles in the slurry is more preferably 0.005 to 5% by mass based on the total mass of the slurry.
- the lower limit of the content of the second particles in the slurry is based on the total mass of the slurry, from the viewpoint that the chemical interaction between the abrasive grains and the surface to be polished is further improved and the polishing rate of the insulating material is further improved. , 0.005% by mass or more, more preferably 0.008% by mass or more, still more preferably 0.01% by mass or more, particularly preferably 0.012% by mass or more, and very preferably 0.015% by mass or more, Highly preferred is 0.016% by mass or more.
- the upper limit of the content of the second particles in the slurry makes it easier to avoid agglomeration of the abrasive grains, further enhances the chemical interaction between the abrasive grains and the surface to be polished, and improves the properties of the abrasive grains.
- the amount is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, particularly preferably 0.5% by mass or less, based on the total mass of the slurry.
- the content of the second particles in the slurry is more preferably 0.005 to 5% by mass based on the total mass of the slurry.
- the lower limit of the content of cerium oxide in the slurry is preferably 0.005% by mass or more, more preferably 0.008% by mass or more based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of the insulating material. , 0.01% by mass or more, particularly preferably 0.05% by mass or more, particularly preferably 0.07% by mass or more, and very preferably 0.08% by mass or more.
- the upper limit of the content of cerium oxide in the slurry is preferably 5% by mass or less based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of the insulating material and increasing the storage stability of the slurry.
- the content of cerium oxide in the slurry is more preferably 0.005 to 5% by mass based on the total mass of the slurry.
- the lower limit of the content of cerium hydroxide in the slurry is based on the total mass of the slurry, from the viewpoint that the chemical interaction between the abrasive grains and the surface to be polished is further improved and the polishing rate of the insulating material is further improved. , 0.005% by mass or more, more preferably 0.008% by mass or more, still more preferably 0.01% by mass or more, particularly preferably 0.012% by mass or more, and very preferably 0.015% by mass or more, Highly preferred is 0.016% by mass or more.
- the upper limit of the content of cerium hydroxide in the slurry makes it easier to avoid agglomeration of the abrasive grains, and further enhances the chemical interaction between the abrasive grains and the surface to be polished, thereby improving the properties of the abrasive grains.
- the amount is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, particularly preferably 0.5% by mass or less, based on the total mass of the slurry.
- the content of the cerium hydroxide in the slurry is more preferably 0.005 to 5% by mass based on the total mass of the slurry.
- the lower limit of the content of the abrasive grains in the slurry is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of the insulating material. It is more preferably at least 0.08 mass%, particularly preferably at least 0.1 mass%.
- the upper limit of the content of the abrasive grains in the slurry is preferably 10% by mass or less, more preferably 5% by mass or less, and more preferably 1% by mass or less, based on the total mass of the slurry, from the viewpoint of increasing the storage stability of the slurry.
- the content of the abrasive grains in the slurry is more preferably 0.01 to 10% by mass based on the total mass of the slurry.
- the slurry according to the present embodiment may contain particles other than the composite particles including the first particles and the second particles.
- particles for example, the first particles not in contact with the second particles; the second particles not in contact with the first particles; silica, alumina, zirconia, yttria And the like (particles not containing the first particles and the second particles).
- the liquid medium is not particularly limited, but water such as deionized water and ultrapure water is preferable.
- the content of the liquid medium may be the remainder of the slurry excluding the content of other components, and is not particularly limited.
- the slurry according to the present embodiment may further contain an optional additive.
- the optional additive include a material having a carboxyl group (excluding a compound corresponding to a polyoxyalkylene compound or a water-soluble polymer), a polyoxyalkylene compound, a water-soluble polymer, an oxidizing agent (for example, hydrogen peroxide), and a dispersion.
- Agents for example, phosphoric acid-based inorganic salts.
- Each of the additives can be used alone or in combination of two or more.
- Examples of the material having a carboxyl group include monocarboxylic acids such as acetic acid, propionic acid, butyric acid, and valeric acid; hydroxy acids such as lactic acid, malic acid, and citric acid; and dicarboxylic acids such as malonic acid, succinic acid, fumaric acid, and maleic acid.
- Monocarboxylic acids such as acetic acid, propionic acid, butyric acid, and valeric acid
- hydroxy acids such as lactic acid, malic acid, and citric acid
- dicarboxylic acids such as malonic acid, succinic acid, fumaric acid, and maleic acid.
- Polycarboxylic acids such as polyacrylic acid and polymaleic acid
- amino acids such as arginine, histidine and lysine.
- Polyoxyalkylene compounds include polyalkylene glycols, polyoxyalkylene derivatives and the like.
- polyalkylene glycol examples include polyethylene glycol, polypropylene glycol, polybutylene glycol and the like.
- polyalkylene glycol at least one selected from the group consisting of polyethylene glycol and polypropylene glycol is preferable, and polyethylene glycol is more preferable.
- the polyoxyalkylene derivative is, for example, a compound obtained by introducing a functional group or a substituent into polyalkylene glycol, or a compound obtained by adding a polyalkylene oxide to an organic compound.
- the functional group or the substituent include an alkyl ether group, an alkyl phenyl ether group, a phenyl ether group, a styrenated phenyl ether group, a glyceryl ether group, an alkylamine group, a fatty acid ester group, and a glycol ester group.
- polyoxyalkylene derivative examples include polyoxyethylene alkyl ether, polyoxyethylene bisphenol ether (for example, BA glycol series manufactured by Nippon Emulsifier Co., Ltd.), and polyoxyethylene styrenated phenyl ether (for example, Emulgen manufactured by Kao Corporation) Series), polyoxyethylene alkylphenyl ether (eg, Neugen EA series manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), polyoxyalkylene polyglyceryl ether (eg, SC-E series and SC-P series manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.) Polyoxyethylene sorbitan fatty acid ester (for example, Daiichi Kogyo Seiyaku Co., Ltd., Sorgen TW series), polyoxyethylene fatty acid ester (for example, Kao Corporation, Emanon series), Lioxyethylene alkylamine (for example, Amiradin D, manufactured by Daiichi Kogyo Seiyaku
- Water-soluble polymer is defined as a polymer that is soluble in 0.1 g or more in 100 g of water.
- the polymer corresponding to the polyoxyalkylene compound is not included in the “water-soluble polymer”.
- the water-soluble polymer is not particularly limited, and includes acrylic polymers such as polyacrylamide and polydimethylacrylamide; polysaccharides such as carboxymethylcellulose, agar, curdlan, dextrin, cyclodextrin, and pullulan; polyvinyl alcohol, polyvinylpyrrolidone, and polysaccharide.
- Vinyl-based polymers such as acrolein; glycerin-based polymers such as polyglycerin and polyglycerin derivatives; and polyethylene glycol.
- the lower limit of the pH of the slurry according to this embodiment is preferably 2.0 or more, more preferably 2.5 or more, still more preferably 2.8 or more, from the viewpoint of further improving the polishing rate of the insulating material.
- the above is particularly preferable, 3.2 or more is extremely preferable, 3.5 or more is very preferable, 4.0 or more is more preferable, and 4.1 or more is further preferable.
- the upper limit of the pH is preferably 7.0 or less, more preferably 6.5 or less, still more preferably 6.0 or less, particularly preferably 5.0 or less, from the viewpoint of further improving the storage stability of the slurry.
- the pH is more preferably from 2.0 to 7.0.
- the pH of the slurry is defined as the pH at a liquid temperature of 25 ° C.
- the pH of the slurry can be adjusted by an acid component such as an inorganic acid and an organic acid; and an alkaline component such as ammonia, sodium hydroxide, tetramethylammonium hydroxide (TMAH), imidazole and alkanolamine.
- a buffer may be added to stabilize the pH.
- a buffer may be added as a buffer (a solution containing a buffer). Examples of such a buffer include an acetate buffer, a phthalate buffer and the like.
- the pH of the slurry according to the present embodiment can be measured with a pH meter (for example, model number PHL-40 manufactured by Toa DKK Ltd.). Specifically, for example, after two-point calibration of a pH meter using a phthalate pH buffer (pH: 4.01) and a neutral phosphate pH buffer (pH: 6.86) as a standard buffer, The electrode of the pH meter is put in the slurry, and the value is measured after 2 minutes or more have passed and stabilized. The temperature of both the standard buffer and the slurry is 25 ° C.
- the constituent components of the polishing liquid may be stored as a one-part polishing liquid, and a slurry (a first liquid) containing abrasive grains and a liquid medium, and an additive And an additive liquid (second liquid) containing a liquid medium, and the constituent components of the polishing liquid are separated into a slurry and an additive liquid so that the polishing liquid becomes the polishing liquid. It may be stored as a polishing liquid set.
- the additive liquid may contain, for example, an oxidizing agent.
- the constituents of the polishing liquid may be stored as a polishing liquid set divided into three or more liquids.
- the slurry and the additive liquid are mixed immediately before or during polishing to prepare a polishing liquid.
- the one-component polishing liquid may be stored as a polishing liquid storage liquid in which the content of the liquid medium is reduced, and may be used after being diluted with the liquid medium during polishing.
- the plural-liquid type polishing liquid set may be stored as a storage liquid for slurry and a storage liquid for additive liquid in which the content of the liquid medium is reduced, and may be used after being diluted with the liquid medium during polishing.
- the polishing method according to the present embodiment (such as a method for polishing a substrate) includes a polishing step of polishing a surface to be polished (such as a surface to be polished of a substrate) using the slurry.
- the slurry in the polishing step may be a polishing liquid obtained by mixing the slurry in the polishing liquid set and the additive liquid.
- the slurry is supplied between the material to be polished and the polishing pad while the material to be polished of the substrate having the material to be polished is pressed against a polishing pad (polishing cloth) of a polishing platen.
- the substrate and the polishing platen are relatively moved to polish the surface to be polished of the material to be polished.
- at least a part of the material to be polished is removed by polishing.
- the substrate to be polished includes a substrate to be polished and the like.
- the substrate to be polished include a substrate in which a material to be polished is formed on a substrate (for example, a semiconductor substrate on which an STI pattern, a gate pattern, a wiring pattern, and the like are formed) for manufacturing a semiconductor element.
- the material to be polished include an insulating material such as silicon oxide.
- the material to be polished may be a single material or a plurality of materials. When a plurality of materials are exposed on the surface to be polished, they can be regarded as the materials to be polished.
- the material to be polished may be a film (a film to be polished) or an insulating film such as a silicon oxide film.
- a material to be polished (for example, an insulating material such as silicon oxide) formed on such a substrate is polished with the slurry, and an excess portion is removed, so that unevenness on the surface of the material to be polished is eliminated.
- a smooth surface can be obtained over the entire surface of the polishing material.
- a general polishing apparatus having a holder capable of holding a substrate having a surface to be polished and a polishing platen to which a polishing pad can be attached can be used as the polishing apparatus.
- Each of the holder and the polishing table is provided with a motor or the like whose rotation speed can be changed.
- a polishing apparatus for example, a polishing apparatus: F-REX300 manufactured by Ebara Corporation or a polishing apparatus: MIRRA manufactured by APPLIED @ MATERIALS can be used.
- polishing pad a general nonwoven fabric, foam, non-foam, or the like can be used.
- material of the polishing pad include polyurethane, acrylic resin, polyester, acrylic-ester copolymer, polytetrafluoroethylene, polypropylene, polyethylene, poly4-methylpentene, cellulose, cellulose ester, polyamide (eg, nylon (trade name)) And aramid), polyimide, polyimide amide, polysiloxane copolymer, oxirane compound, phenol resin, polystyrene, polycarbonate, epoxy resin and the like.
- the material of the polishing pad is preferably at least one selected from the group consisting of foamed polyurethane and non-foamed polyurethane, particularly from the viewpoint of further improving the polishing rate and flatness.
- the polishing pad is preferably provided with a groove processing for accumulating slurry.
- This embodiment is preferably used for polishing a surface to be polished containing silicon oxide. According to the present embodiment, it is possible to provide use of a slurry for polishing a surface to be polished including silicon oxide.
- the present embodiment can be suitably used for forming an STI and for high-speed polishing of an interlayer insulating material.
- the lower limit of the polishing rate of the insulating material is preferably 850 nm / min or more, more preferably 900 nm / min or more, and further preferably 1000 nm / min or more.
- This embodiment can also be used for polishing a premetal insulating material.
- the premetal insulating material include silicon oxide, phosphorus-silicate glass, boron-phosphorus-silicate glass, silicon oxyfluoride, and amorphous carbon fluoride.
- This embodiment can be applied to materials other than insulating materials such as silicon oxide.
- materials include high dielectric constant materials such as Hf-based, Ti-based, and Ta-based oxides; semiconductor materials such as silicon, amorphous silicon, SiC, SiGe, Ge, GaN, GaP, GaAs, and organic semiconductors; and GeSbTe. Phase change materials; inorganic conductive materials such as ITO; and polymer resin materials such as polyimide, polybenzoxazole, acrylic, epoxy, and phenol.
- the present embodiment is applicable not only to a film-shaped polishing target but also to various substrates made of glass, silicon, SiC, SiGe, Ge, GaN, GaP, GaAs, sapphire, plastic, or the like.
- This embodiment is applicable not only to the manufacture of semiconductor elements, but also to image display devices such as TFTs and organic ELs; optical components such as photomasks, lenses, prisms, optical fibers, and single-crystal scintillators; A light-emitting element such as a solid-state laser or a blue laser LED; and a light-emitting element such as a magnetic disk or a magnetic head.
- image display devices such as TFTs and organic ELs
- optical components such as photomasks, lenses, prisms, optical fibers, and single-crystal scintillators
- a light-emitting element such as a solid-state laser or a blue laser LED
- a light-emitting element such as a magnetic disk or a magnetic head.
- cerium oxide particles Particles containing cerium oxide (first particles; hereinafter, referred to as “cerium oxide particles”) mixed with ammonium dihydrogen phosphate (molecular weight: 97.99) manufactured by Wako Pure Chemical Industries, Ltd.
- a cerium oxide slurry (pH: 7) containing 5.0% by mass (solid content) of cerium oxide particles was prepared.
- the amount of ammonium dihydrogen phosphate was adjusted to 1% by mass based on the total amount of cerium oxide particles.
- cerium oxide slurry An appropriate amount of cerium oxide slurry was charged into Beckman Coulter Co., Ltd. trade name: DelsaNano @ C, and the measurement was performed twice at 25 ° C. The average value of the indicated zeta potential was obtained as the zeta potential.
- the zeta potential of the cerium oxide particles in the cerium oxide slurry was -55 mV.
- the obtained precipitate (precipitate containing cerium hydroxide) was centrifuged (4000 min -1 , 5 minutes), and then the liquid phase was removed by decantation to perform solid-liquid separation. After mixing 10 g of the particles obtained by the solid-liquid separation and 990 g of water, the particles are dispersed in water using an ultrasonic cleaner, and the particles containing cerium hydroxide (second particles; hereinafter, referred to as “second particles”). A cerium hydroxide slurry containing “cerium hydroxide particles” (particle content: 1.0% by mass) was prepared.
- the average particle size (average secondary particle size) of the cerium hydroxide particles in the cerium hydroxide slurry was measured using a trade name: N5 manufactured by Beckman Coulter KK and found to be 10 nm.
- the measuring method is as follows. First, about 1 mL of a measurement sample (cerium hydroxide slurry; aqueous dispersion) containing 1.0% by mass of cerium hydroxide particles was placed in a 1 cm square cell, and then the cell was placed in N5.
- the refractive index of the measurement sample information of N5 software was set to 1.333, the viscosity was set to 0.887 mPa ⁇ s, the measurement was performed at 25 ° C., and the value indicated as Unimodal Size Mean was read.
- the cerium hydroxide particles at least partially contained particles having nitrate ions bonded to the cerium element. Further, since the particles having hydroxide ions bonded to the cerium element are contained in at least a part of the cerium hydroxide particles, it was confirmed that the cerium hydroxide particles contained cerium hydroxide. From these results, it was confirmed that the cerium hydroxide contained hydroxide ions bonded to the cerium element.
- Example 1 While stirring at a rotation speed of 300 rpm using two stirring blades, 25 g of the cerium hydroxide slurry and 1935 g of ion-exchanged water were mixed to obtain a mixed solution. Subsequently, 40 g of the cerium oxide slurry was mixed with the mixture while stirring the mixture, and the mixture was irradiated with ultrasonic waves using an ultrasonic cleaning machine (device name: US-105) manufactured by SND Corporation. While stirring.
- an ultrasonic cleaning machine device name: US-105
- test slurry containing a composite particle containing cerium oxide particles and cerium hydroxide particles in contact with the cerium oxide particles (cerium oxide particle content: 0.1% by mass, cerium oxide particles (Content of hydroxide particles: 0.0125% by mass).
- Example 2 While stirring at a rotation speed of 300 rpm using a two-blade stirring blade, 30 g of the cerium hydroxide slurry and 1930 g of ion-exchanged water were mixed to obtain a mixed solution. Subsequently, 40 g of the cerium oxide slurry was mixed with the mixture while stirring the mixture, and the mixture was irradiated with ultrasonic waves using an ultrasonic cleaning machine (device name: US-105) manufactured by SND Corporation. While stirring.
- an ultrasonic cleaning machine device name: US-105
- cerium hydroxide particles not in contact with the cerium oxide particles (A content of cerium oxide particles: 0.1% by mass, a content of cerium hydroxide particles: 0.015% by mass) was prepared.
- Example 3 35 g of the cerium hydroxide slurry and 1925 g of ion-exchanged water were mixed while stirring at a rotation speed of 300 rpm using two stirring blades to obtain a mixed solution. Subsequently, 40 g of the cerium oxide slurry was mixed with the mixture while stirring the mixture, and the mixture was irradiated with ultrasonic waves using an ultrasonic cleaning machine (device name: US-105) manufactured by SND Corporation. While stirring.
- an ultrasonic cleaning machine device name: US-105
- cerium hydroxide particles not in contact with the cerium oxide particles (free particles) (A content of cerium oxide particles: 0.1% by mass, a content of cerium hydroxide particles: 0.0175% by mass) was prepared.
- Example 4 While stirring at a rotation speed of 300 rpm using two stirring blades, 40 g of the cerium hydroxide slurry and 1920 g of ion-exchanged water were mixed to obtain a mixed solution. Subsequently, 40 g of the cerium oxide slurry was mixed with the mixture while stirring the mixture, and the mixture was irradiated with ultrasonic waves using an ultrasonic cleaning machine (device name: US-105) manufactured by SND Corporation. While stirring.
- an ultrasonic cleaning machine device name: US-105
- cerium hydroxide particles not in contact with the cerium oxide particles (A content of cerium oxide particles: 0.1% by mass, a content of cerium hydroxide particles: 0.02% by mass) was prepared.
- ⁇ Measurement of valence> Using a centrifuge (trade name: Optima MAX-TL) manufactured by Beckman Coulter, Inc., the test slurry is treated at a centrifugal acceleration of 1.1 ⁇ 10 4 G for 30 minutes to obtain a solid phase and a liquid phase (supernatant). ) Separated. After removing the liquid phase, the solid phase was vacuum-dried at 25 ° C. for 24 hours to obtain a measurement sample. The valence of cerium contained in the abrasive grains in this measurement sample was measured by X-ray photoelectron spectroscopy.
- XPS X-ray photoelectron spectroscopy
- K-Alpha trade name, manufactured by Thermo Fisher Scientific
- Pass energy 100 eV
- Binding energy 870 to 930 eV
- X-ray diameter 200 ⁇ m
- Photoelectron escape angle 45 °
- Trivalent ratio (trivalent amount [at%] / (trivalent amount [at%] + tetravalent amount [at%])
- ⁇ Measurement of polishing rate> The content of abrasive grains (total amount of particles) in the test slurry was adjusted to 0.1% by mass (diluted with ion-exchanged water) to obtain a CMP polishing liquid.
- the substrate to be polished was polished under the following polishing conditions using the CMP polishing liquid.
- the valence, pH, zeta potential and average particle size of the abrasive grains in the CMP polishing liquid were equivalent to the values of the test slurry described above.
- Polishing device MIRRA (manufactured by APPLIED MATERIALS) Flow rate of CMP polishing liquid: 200 mL / min Substrate to be Polished: As a blanket wafer on which no pattern was formed, a substrate to be polished having a silicon oxide film having a thickness of 2 ⁇ m formed on a silicon substrate by a plasma CVD method was used.
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Abstract
Description
本明細書において、「~」を用いて示された数値範囲は、「~」の前後に記載される数値をそれぞれ最小値及び最大値として含む範囲を示す。本明細書に段階的に記載されている数値範囲において、ある段階の数値範囲の上限値又は下限値は、他の段階の数値範囲の上限値又は下限値と任意に組み合わせることができる。本明細書に記載されている数値範囲において、その数値範囲の上限値又は下限値は、実施例に示されている値に置き換えてもよい。「A又はB」とは、A及びBのどちらか一方を含んでいればよく、両方とも含んでいてもよい。本明細書に例示する材料は、特に断らない限り、1種を単独で又は2種以上を組み合わせて用いることができる。本明細書において、組成物中の各成分の含有量は、組成物中に各成分に該当する物質が複数存在する場合、特に断らない限り、組成物中に存在する当該複数の物質の合計量を意味する。「工程」との語は、独立した工程だけではなく、他の工程と明確に区別できない場合であってもその工程の所期の作用が達成されれば、本用語に含まれる。
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]
本実施形態に係るスラリは、必須成分として砥粒と液状媒体とを含有する。本実施形態に係るスラリは、例えば、研磨液(CMP研磨液)として用いることができる。
本実施形態に係るスラリの砥粒は、上述のとおり、第1の粒子と、当該第1の粒子に接触した第2の粒子と、を含む複合粒子を含有する。第2の粒子は、金属酸化物及び金属水酸化物からなる群より選ばれる少なくとも一種の金属化合物を含み、前記金属化合物が、複数の価数を取り得る金属(以下、「金属M」という)を含む。すなわち、第2の粒子は、金属Mを含む酸化物、及び、金属Mを含む水酸化物からなる群より選ばれる少なくとも一種を含む。
吸光度 =-LOG10(光透過率[%]/100)
液状媒体としては、特に制限はないが、脱イオン水、超純水等の水が好ましい。液状媒体の含有量は、他の構成成分の含有量を除いたスラリの残部でよく、特に限定されない。
本実施形態に係るスラリは、任意の添加剤を更に含有していてもよい。任意の添加剤としては、カルボキシル基を有する材料(ポリオキシアルキレン化合物又は水溶性高分子に該当する化合物を除く)、ポリオキシアルキレン化合物、水溶性高分子、酸化剤(例えば過酸化水素)、分散剤(例えばリン酸系無機塩)等が挙げられる。添加剤のそれぞれは、一種を単独で又は二種以上を組み合わせて使用することができる。
本実施形態に係るスラリのpHの下限は、絶縁材料の研磨速度が更に向上する観点から、2.0以上が好ましく、2.5以上がより好ましく、2.8以上が更に好ましく、3.0以上が特に好ましく、3.2以上が極めて好ましく、3.5以上が非常に好ましく、4.0以上がより一層好ましく、4.1以上が更に好ましい。pHの上限は、スラリの保存安定性が更に向上する観点から、7.0以下が好ましく、6.5以下がより好ましく、6.0以下が更に好ましく、5.0以下が特に好ましく、4.8以下が極めて好ましく、4.7以下が非常に好ましく、4.6以下がより一層好ましく、4.5以下が更に好ましく、4.4以下が特に好ましい。前記観点から、pHは、2.0~7.0であることがより好ましい。スラリの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(基体の研磨方法等)は、前記スラリを用いて被研磨面(基体の被研磨面等)を研磨する研磨工程を備えている。研磨工程におけるスラリは、前記研磨液セットにおけるスラリと添加液とを混合して得られる研磨液であってもよい。
セリウム酸化物を含む粒子(第1の粒子。以下、「セリウム酸化物粒子」という)と、和光純薬工業株式会社製の商品名:リン酸二水素アンモニウム(分子量:97.99)とを混合して、セリウム酸化物粒子を5.0質量%(固形分含量)含有するセリウム酸化物スラリ(pH:7)を調製した。リン酸二水素アンモニウムの配合量は、セリウム酸化物粒子の全量を基準として1質量%に調整した。
(セリウム水酸化物の合成)
480gのCe(NH4)2(NO3)650質量%水溶液(日本化学産業株式会社製、商品名:CAN50液)を7450gの純水と混合して溶液を得た。次いで、この溶液を撹拌しながら、750gのイミダゾール水溶液(10質量%水溶液、1.47mol/L)を5mL/minの混合速度で滴下して、セリウム水酸化物を含む沈殿物を得た。セリウム水酸化物の合成は、温度20℃、撹拌速度500min-1で行った。撹拌は、羽根部全長5cmの3枚羽根ピッチパドルを用いて行った。
ベックマン・コールター株式会社製、商品名:N5を用いてセリウム水酸化物スラリにおけるセリウム水酸化物粒子の平均粒径(平均二次粒径)を測定したところ、10nmであった。測定法は次のとおりである。まず、1.0質量%のセリウム水酸化物粒子を含む測定サンプル(セリウム水酸化物スラリ。水分散液)を1cm角のセルに約1mL入れた後、N5内にセルを設置した。N5のソフトの測定サンプル情報の屈折率を1.333、粘度を0.887mPa・sに設定し、25℃において測定を行い、Unimodal Size Meanとして表示される値を読み取った。
ベックマン・コールター株式会社製の商品名:DelsaNano C内に適量のセリウム水酸化物スラリを投入し、25℃において測定を2回行った。表示されたゼータ電位の平均値をゼータ電位として得た。セリウム水酸化物スラリにおけるセリウム水酸化物粒子のゼータ電位は+50mVであった。
セリウム水酸化物スラリを適量採取し、真空乾燥してセリウム水酸化物粒子を単離した後に純水で充分に洗浄して試料を得た。得られた試料について、FT-IR ATR法による測定を行ったところ、水酸化物イオン(OH-)に基づくピークの他に、硝酸イオン(NO3 -)に基づくピークが観測された。また、同試料について、窒素に対するXPS(N-XPS)測定を行ったところ、NH4 +に基づくピークは観測されず、硝酸イオンに基づくピークが観測された。これらの結果より、セリウム水酸化物粒子は、セリウム元素に結合した硝酸イオンを有する粒子を少なくとも一部含有することが確認された。また、セリウム元素に結合した水酸化物イオンを有する粒子がセリウム水酸化物粒子の少なくとも一部に含有されることから、セリウム水酸化物粒子がセリウム水酸化物を含有することが確認された。これらの結果より、セリウムの水酸化物が、セリウム元素に結合した水酸化物イオンを含むことが確認された。
(実施例1)
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら、前記セリウム水酸化物スラリ25gと、イオン交換水1935gとを混合して混合液を得た。続いて、前記混合液を撹拌しながら前記セリウム酸化物スラリ40gを前記混合液に混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム酸化物粒子と、当該セリウム酸化物粒子に接触したセリウム水酸化物粒子と、を含む複合粒子を含有する試験用スラリ(セリウム酸化物粒子の含有量:0.1質量%、セリウム水酸化物粒子の含有量:0.0125質量%)を調製した。
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら、前記セリウム水酸化物スラリ30gと、イオン交換水1930gとを混合して混合液を得た。続いて、前記混合液を撹拌しながら前記セリウム酸化物スラリ40gを前記混合液に混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム酸化物粒子と、当該セリウム酸化物粒子に接触したセリウム水酸化物粒子と、を含む複合粒子に加えて、セリウム酸化物粒子に接触していないセリウム水酸化物粒子(遊離粒子)を含有する試験用スラリ(セリウム酸化物粒子の含有量:0.1質量%、セリウム水酸化物粒子の含有量:0.015質量%)を調製した。
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら、前記セリウム水酸化物スラリ35gと、イオン交換水1925gとを混合して混合液を得た。続いて、前記混合液を撹拌しながら前記セリウム酸化物スラリ40gを前記混合液に混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム酸化物粒子と、当該セリウム酸化物粒子に接触したセリウム水酸化物粒子と、を含む複合粒子に加えて、セリウム酸化物粒子に接触していないセリウム水酸化物粒子(遊離粒子)を含有する試験用スラリ(セリウム酸化物粒子の含有量:0.1質量%、セリウム水酸化物粒子の含有量:0.0175質量%)を調製した。
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら、前記セリウム水酸化物スラリ40gと、イオン交換水1920gとを混合して混合液を得た。続いて、前記混合液を撹拌しながら前記セリウム酸化物スラリ40gを前記混合液に混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム酸化物粒子と、当該セリウム酸化物粒子に接触したセリウム水酸化物粒子と、を含む複合粒子に加えて、セリウム酸化物粒子に接触していないセリウム水酸化物粒子(遊離粒子)を含有する試験用スラリ(セリウム酸化物粒子の含有量:0.1質量%、セリウム水酸化物粒子の含有量:0.02質量%)を調製した。
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら前記セリウム酸化物スラリ40gとイオン交換水1960gとを混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム酸化物粒子を含有する試験用スラリ(セリウム酸化物粒子の含有量:0.1質量%)を調製した。
2枚羽根の撹拌羽根を用いて300rpmの回転数で撹拌しながら前記セリウム水酸化物スラリ200gとイオン交換水1800gとを混合した後、株式会社エスエヌディ製の超音波洗浄機(装置名:US-105)を用いて超音波を照射しながら撹拌した。これにより、セリウム水酸化物粒子を含有する試験用スラリ(セリウム水酸化物粒子の含有量:0.1質量%)を調製した。
ベックマン・コールター株式会社製の遠心分離機(商品名:Optima MAX-TL)を用いて試験用スラリを遠心加速度1.1×104Gで30分間処理することにより固相及び液相(上澄み液)を分離した。液相を除去した後、固相を25℃で24時間真空乾燥することにより測定試料を得た。この測定試料中の砥粒に含まれるセリウムの価数をX線光電子分光法により測定した。
[XPS条件]
パスエネルギー:100eV
積算回数:10回
結合エネルギー:870~930eVの範囲
励起X線:monochromatic Al Kα1,2線(1486.6eV)
X線径:200μm
光電子脱出角度:45°
3価の割合 = (3価の量[at%]/(3価の量[at%]+4価の量[at%])
試験用スラリのpHを東亜ディーケーケー株式会社製の型番PHL-40を用いて測定した。測定結果を表1に示す。
ベックマン・コールター株式会社製の商品名「DelsaNano C」内に適量の試験用スラリを投入した。25℃において測定を2回行い、表示されたゼータ電位の平均値を採用した。測定結果を表1に示す。
マイクロトラック・ベル株式会社製の商品名:マイクロトラックMT3300EXII内に実施例1~4及び比較例1の各試験用スラリを適量投入し、砥粒の平均粒径の測定を行った。また、ベックマン・コールター株式会社製の商品名:N5内に比較例2の試験用スラリを適量投入し、砥粒の平均粒径の測定を行った。表示されたそれぞれの平均粒径値を砥粒の平均粒径(平均二次粒径)として得た。測定結果を表1に示す。
前記試験用スラリにおける砥粒の含有量(粒子の合計量)を0.1質量%に調整(イオン交換水で希釈)してCMP研磨液を得た。このCMP研磨液を用いて下記研磨条件で被研磨基板を研磨した。CMP研磨液における価数、pH、砥粒のゼータ電位及び平均粒径の値は、上述の試験用スラリの値と同等であった。
[CMP研磨条件]
研磨装置:MIRRA(APPLIED MATERIALS社製)
CMP研磨液の流量:200mL/min
被研磨基板:パターンが形成されていないブランケットウエハとして、プラズマCVD法で形成された厚さ2μmの酸化珪素膜をシリコン基板上に有する被研磨基板を用いた。
研磨パッド:独立気泡を有する発泡ポリウレタン樹脂(ダウ・ケミカル日本株式会社製、型番IC1010)
研磨圧力:13kPa(2.0psi)
被研磨基板及び研磨定盤の回転数:被研磨基板/研磨定盤=93/87rpm
研磨時間:1min
ウエハの洗浄:CMP処理後、超音波を印加しながら水で洗浄し、さらに、スピンドライヤで乾燥させた。
Claims (8)
- 砥粒と、液状媒体と、を含有し、
前記砥粒が、第1の粒子と、当該第1の粒子に接触した第2の粒子と、を含み、
前記第2の粒子が、金属酸化物及び金属水酸化物からなる群より選ばれる少なくとも一種の金属化合物を含み、
前記金属化合物が、複数の価数を取り得る金属を含み、
前記金属の前記複数の価数の中で最も小さい価数の割合がX線光電子分光法において0.10以上である、スラリ。 - 前記最も小さい価数が3価である、請求項1に記載のスラリ。
- 前記金属が希土類金属を含む、請求項1又は2に記載のスラリ。
- 前記金属がセリウムを含む、請求項1~3のいずれか一項に記載のスラリ。
- 前記第1の粒子が、珪素、バナジウム、マンガン、鉄、コバルト、ニッケル、銅、銀、インジウム、スズ、希土類元素、タングステン、及び、ビスマスからなる群より選ばれる少なくとも一種を含む、請求項1~4のいずれか一項に記載のスラリ。
- 前記第1の粒子がセリウム酸化物を含む、請求項1~5のいずれか一項に記載のスラリ。
- 前記砥粒のゼータ電位が+10mV以上である、請求項1~6のいずれか一項に記載のスラリ。
- 請求項1~7のいずれか一項に記載のスラリを用いて被研磨面を研磨する工程を備える、研磨方法。
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