WO2020065723A1 - スラリ及び研磨方法 - Google Patents
スラリ及び研磨方法 Download PDFInfo
- Publication number
- WO2020065723A1 WO2020065723A1 PCT/JP2018/035445 JP2018035445W WO2020065723A1 WO 2020065723 A1 WO2020065723 A1 WO 2020065723A1 JP 2018035445 W JP2018035445 W JP 2018035445W WO 2020065723 A1 WO2020065723 A1 WO 2020065723A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- particles
- mass
- slurry
- polishing
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
-
- 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
- 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
-
- 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
- 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
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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.
- silicon oxide containing carbon may be used as an insulating material. Therefore, even when silicon oxide containing carbon is used, it is required to improve the polishing rate of silicon oxide containing carbon from the viewpoint of quickly eliminating the above-described steps.
- the present invention has been made to solve the above problems, and has as its object to provide a slurry capable of improving the polishing rate of silicon oxide containing carbon, and a polishing method using the slurry.
- a slurry according to one aspect of the present invention is a slurry for polishing silicon oxide containing carbon, which includes abrasive grains and a liquid medium, wherein the abrasive grains include first particles and the second particles.
- the polishing rate of silicon oxide containing carbon can be improved, and silicon oxide containing carbon 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.
- a slurry capable of improving the polishing rate of silicon oxide containing carbon can be provided.
- a polishing method using the slurry can be provided.
- the use of the slurry for polishing silicon oxide containing carbon can be provided. According to the present invention, 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
- 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 is a slurry for polishing silicon oxide containing carbon.
- Examples of the silicon oxide containing carbon include black diamond.
- 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).
- polishing liquid abrasive
- polishing liquid is defined as a composition that comes into contact with a surface to be polished during polishing.
- the phrase "polishing liquid” itself does not limit the components contained in the polishing liquid at all.
- Abrasive grains contain composite particles including first particles and second particles in contact with the first particles.
- the particle size of the second particles is smaller than the particle size of the first particles.
- the first particles contain a cerium oxide and the second particles contain a cerium compound.
- the polishing rate of silicon oxide containing carbon can be improved.
- the reasons why the polishing rate is improved as described above include, for example, the following reasons. However, the reason is not limited to the following.
- the first particles containing cerium oxide and having a particle size larger than the second particles have a mechanical action (mechanical properties) on silicon oxide containing carbon as compared with the second particles. strong.
- the second particles containing the cerium compound and having a smaller particle size than the first particles have a smaller mechanical action on silicon oxide containing carbon as compared with the first particles, but have a smaller particle size.
- a synergistic effect of improving the polishing rate is easily obtained.
- silicon oxide containing carbon hydrophobicity tends to be stronger as compared with the case where carbon is not contained.
- the affinity of silicon oxide for a slurry containing a liquid medium such as water tends to be low, and the use of conventional particles tends to lower the polishing rate.
- the above-described composite particles are used for polishing, so that a sufficient polishing effect can be obtained even on a material to be polished (silicon oxide containing carbon) having relatively low affinity. Is exhibited. From the above, it is inferred that the polishing rate of silicon oxide containing carbon can be improved by using the slurry according to the present embodiment.
- the abrasive grains of the slurry according to the present embodiment include the composite particles including the first particles and the second particles in contact with the first particles.
- the particle size of the second particles is 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.
- the lower limit of the particle size 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, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. Above is extremely preferred, 80 nm or more is very preferred, and 100 nm or more is even more preferred.
- 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 silicon oxide containing carbon.
- 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 such as composite 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 particularly preferably 50 nm or more, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. Is very preferably, 100 nm or more is very preferable, 120 nm or more is still more preferable, and 140 nm or more is still more 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 first particles contain a cerium oxide (eg, ceria), and the second particles contain a cerium compound.
- the cerium compound of the second particles include cerium hydroxide and cerium oxide.
- cerium compound of the second particles a compound different from cerium oxide can be used.
- the cerium compound preferably contains cerium hydroxide. Abrasive grains containing cerium hydroxide have a higher reactivity (chemical action) with silicon oxide containing carbon due to the action of a hydroxyl group than particles made of silica, cerium oxide, and the like. Silicon can be polished at a higher polishing rate.
- Cerium hydroxide is, for example, a compound containing tetravalent cerium (Ce 4+ ) 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 NO 3 ⁇ and sulfate SO 4 2 ⁇ ) bound to tetravalent cerium.
- Cerium hydroxide can be produced by reacting a cerium salt with an alkali source (base).
- the cerium hydroxide is preferably produced by mixing a cerium salt and an alkaline liquid (for example, an alkaline aqueous solution).
- an alkaline liquid for example, 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.
- cerium salt conventionally known ones can be used without particular limitation, and 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.
- 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 the cerium oxide in the first particles is that the whole of the first particles (the whole of the first particles contained in the slurry; hereinafter the same) from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. ), 50% by mass or more is preferable, 70% by mass or more is more preferable, 90% by mass or more is more preferable, and 95% by mass or more is particularly preferable.
- 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 that the whole of the second particles (the whole of the second particles contained in the slurry; the same applies hereinafter) from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. 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, based on
- 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 mass% based on the entire abrasive grains (the entire abrasive grains contained in the slurry; the same applies hereinafter) from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. % Or more, more preferably more than 50% by mass, still more preferably 60% by mass or more, particularly preferably 70% by mass or more, and very preferably 75% 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, based on the entire abrasive particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon.
- 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 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 silicon oxide containing carbon. It is preferably 7% by mass or more, more preferably 10% by mass or more, particularly preferably 12% by mass or more, particularly preferably 14% by mass or more, very preferably 15% by mass or more, and still more preferably 18% by mass or more. It is preferably at least 20% by mass, more preferably at least 22% by 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, based on the entire abrasive particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. , 40% by mass or less is more preferable, 30% by mass or less is particularly preferable, and 25% by mass or less is very preferable. From the above viewpoint, 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 content of cerium oxide in the abrasive grains is preferably 50% 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 silicon oxide containing carbon. , More preferably more than 50% by mass, still more preferably 60% by mass or more, particularly preferably 70% by mass or more, and very preferably 75% by mass or more.
- 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, based on the entire abrasive grain, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon.
- 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 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 silicon oxide containing carbon. It is preferably 7% by mass or more, more preferably 10% by mass or more, particularly preferably 12% by mass or more, particularly preferably 14% by mass or more, very preferably 15% by mass or more, and still more preferably 18% by mass or more. It is preferably at least 20% by mass, more preferably at least 22% by 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, based on the entire abrasive grain, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. , 40% by mass or less is more preferable, 30% by mass or less is particularly preferable, and 25% by mass or less is very preferable. From the above viewpoint, 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 based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. It is more preferably more than 70% by mass, more preferably 60% by mass or more, particularly preferably 70% by mass or more, and very preferably 75% by mass or more.
- the upper limit of the content of the first particles is preferably 95% by mass or less, based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. 80% by mass or less, particularly preferably 88% by mass or less, particularly preferably 86% by mass or less, very preferably 85% by mass or less, even more preferably 82% by mass or less. It is more preferably at most 78 mass%, particularly preferably at most 78 mass%. 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, based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. Is preferably at least 10% by mass, more preferably at least 12% by mass, particularly preferably at least 14% by mass, very preferably at least 15% by mass, even more preferably at least 18% by mass. It is more preferably at least 22 mass%, particularly preferably at least 22 mass%.
- the upper limit of the content of the second particles is preferably 50% by mass or less, based on the total amount of the first particles and the second particles, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon.
- 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, based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon.
- the above is more preferable, 0.01% by mass or more is further preferable, 0.03% by mass or more is particularly preferable, 0.05% by mass or more is very preferable, and 0.07% by mass or more is very preferable.
- the upper limit of the content of the first particles in the slurry is 5 mass% based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon 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 such that the chemical interaction between the abrasive grains and the surface to be polished is further improved, and the polishing rate of silicon oxide containing carbon is further improved.
- 0.005 mass% or more is preferable, 0.008 mass% or more is more preferable, 0.01 mass% or more is more preferable, 0.012 mass% or more is especially preferable, and 0.015 mass% or more is based on mass. Is very preferably 0.018% by mass or more, very preferably 0.02% by mass or more, further preferably 0.0225% by mass or more, and particularly preferably 0.023% 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 is very preferably 1% by mass or less, very preferably 0.05% by mass or less, further preferably 0.04% by mass or less, still more preferably 0.035% by mass or less, and still more preferably 0.03% by mass or less.
- 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 silicon oxide containing carbon. Is more preferably 0.01% by mass or more, further preferably 0.03% by mass or more, particularly preferably 0.05% by mass or more, and very preferably 0.07% by mass or more.
- the upper limit of the content of cerium oxide in the slurry is 5% by mass based on the total mass of the slurry, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon 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 cerium hydroxide content in the slurry is such that the chemical interaction between the abrasive grains and the surface to be polished is further improved, and the polishing rate of silicon oxide containing carbon is further improved.
- 0.005 mass% or more is preferable, 0.008 mass% or more is more preferable, 0.01 mass% or more is more preferable, 0.012 mass% or more is especially preferable, and 0.015 mass% or more is based on mass. Is very preferably 0.018% by mass or more, very preferably 0.02% by mass or more, further preferably 0.0225% by mass or more, and particularly preferably 0.023% 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 is very preferably 1% by mass or less, very preferably 0.05% by mass or less, further preferably 0.04% by mass or less, still more preferably 0.035% by mass or less, and still more preferably 0.03% by mass or less.
- 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, and 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 silicon oxide containing carbon. More preferably, the content is more preferably 0.09% by mass or more.
- 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 is more preferably 0.5% by mass or less, particularly preferably 0.1% by mass or less. From the above viewpoint, 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 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.
- the second particles contain cerium hydroxide and satisfy at least one of the following conditions (a) and (b).
- the “aqueous dispersion” in which the content of the second particles is adjusted to a predetermined amount means a liquid containing a predetermined amount of the second particles and water.
- the second particles give an absorbance of 1.00 or more to light having a wavelength of 400 nm in an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass.
- the second particles give an absorbance of 1.000 or more to light having a wavelength of 290 nm in an aqueous dispersion in which the content of the second particles is adjusted to 0.0065% by mass.
- the polishing rate is further improved by using particles that give an absorbance of 1.00 or more for light having a wavelength of 400 nm in an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass. Can be done.
- the reason for this is not necessarily clear, but the present inventor thinks as follows. That is, it is composed of tetravalent cerium (Ce 4+ ), one to three hydroxide ions (OH ⁇ ), and one to three anions (X c ⁇ ), depending on the production conditions of the cerium hydroxide.
- the particles containing cerium hydroxide may include not only Ce (OH) a Xb but also Ce (OH) 4 , CeO 2 and the like.
- Examples of the anion (X c ⁇ ) include NO 3 — and SO 4 2- .
- 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) It can be confirmed by a method of detecting a peak corresponding to an anion (X c ⁇ ) by infrared spectrophotometry total reflection measurement. The presence of an anion (X c ⁇ ) can also be confirmed by XPS (X-ray Photoelectron Spectroscopy, X-ray photoelectron spectroscopy).
- the absorption peak of Ce (OH) a Xb (for example, Ce (OH) 3 X) at a wavelength of 400 nm is much smaller than the absorption peak at a wavelength of 290 nm described later.
- the present inventor examined the magnitude of the absorbance using an aqueous dispersion having a content of 1.0% by mass, in which the content of the particles was relatively large and the absorbance was large and easily detected. It has been found that the use of particles that give an absorbance of at least 1.00 for light having a wavelength of 400 nm in the liquid is excellent in improving the polishing rate.
- the lower limit of the absorbance with respect to light having a wavelength of 400 nm is preferably 1.50 or more, more preferably 1.55 or more, and still more preferably 1.60 or more, from the viewpoint of making it easier to polish silicon oxide containing carbon at a more excellent polishing rate. preferable.
- the polishing rate can be increased by using the second particles that give an absorbance of 1.000 or more to light having a wavelength of 290 nm in an aqueous dispersion in which the content of the second particles is adjusted to 0.0065% by mass. Can be further improved.
- the present inventor thinks as follows. That is, particles containing Ce (OH) a Xb (for example, Ce (OH) 3 X) generated according to the production conditions of cerium hydroxide have an absorption peak near a wavelength of 290 nm in calculation, For example, particles composed of Ce 4+ (OH ⁇ ) 3 NO 3 ⁇ have an absorption peak at a wavelength of 290 nm. Therefore, it is considered that the polishing rate is improved as the abundance of Ce (OH) a Xb increases and the absorbance with respect to light having a wavelength of 290 nm increases.
- the absorbance with respect to light having a wavelength of about 290 nm tends to be detected so as to exceed the measurement limit.
- the present inventor examined the magnitude of the absorbance using an aqueous dispersion having a content of 0.0065% by mass, in which the content of the particles was relatively small, the absorbance was small, and the absorbance was small. It has been found that, when particles that give an absorbance of 1.000 or more to light having a wavelength of 290 nm are used in the liquid, the polishing rate is effectively improved.
- the lower limit of the absorbance to light having a wavelength of 290 nm is more preferably 1.050 or more, still more preferably 1.100 or more, and particularly preferably 1.130 or more, from the viewpoint of polishing silicon oxide containing carbon at a more excellent polishing rate. , 1.150 or more is very preferable.
- the upper limit of the absorbance for light having a wavelength of 290 nm is not particularly limited, but is preferably, for example, 10.00 or less.
- the second particles that give an absorbance of 1.00 or more to light having a wavelength of 400 nm are in an aqueous dispersion in which the content of the second particles has been adjusted to 0.0065% by mass, and have an absorbance of 1.000 or more to light having a wavelength of 290 nm.
- Silicon oxide containing carbon can be polished at an even higher polishing rate.
- cerium hydroxide for example, Ce (OH) a Xb
- Ce (OH) a Xb a Xb
- the second particles contain the second particles. It is preferable that the aqueous dispersion adjusted to the amount of 0.0065 mass% (65 ppm) gives an absorbance of 0.010 or less with respect to light having a wavelength of 450 to 600 nm.
- the absorbance for all light in the wavelength range of 450 to 600 nm does not exceed 0.010 in the aqueous dispersion in which the content of the second particles is adjusted to 0.0065% by mass.
- the upper limit of the absorbance for light having a wavelength of 450 to 600 nm is more preferably less than 0.010.
- the lower limit of the absorbance for light having a wavelength of 450 to 600 nm is preferably 0.
- the absorbance of the aqueous dispersion can be measured using, for example, a spectrophotometer (device name: U3310) manufactured by Hitachi, Ltd. Specifically, for example, an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass or 0.0065% by mass is prepared as a measurement sample. About 4 mL of this measurement sample is placed in a 1 cm square cell, and the cell is placed in the apparatus. Next, absorbance is measured in the wavelength range of 200 to 600 nm, and the absorbance is determined from the obtained chart.
- a spectrophotometer device name: U3310
- an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass or 0.0065% by mass is prepared as a measurement sample. About 4 mL of this measurement sample is placed in a 1 cm square cell, and the cell is placed in the apparatus. Next, absorbance is measured in the wavelength range of 200 to 600 nm, and the absorbance is determined from the obtained chart.
- the second particles contained in the slurry according to the present embodiment have a light transmittance of 50% / cm with respect to light having a wavelength of 500 nm in an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass. It is preferable to provide the above. As a result, a decrease in the polishing rate due to the addition of the additive can be further suppressed, so that it is easy to obtain other characteristics while maintaining the polishing rate.
- the lower limit of the light transmittance is more preferably 60% / cm or more, still more preferably 70% / cm or more, particularly preferably 80% / cm or more, particularly preferably 90% / cm or more, and 92% or more. / Cm or more is very preferable.
- the upper limit of the light transmittance is 100% / cm.
- particles present in the aqueous dispersion are relatively large particles (hereinafter, referred to as “coarse particles”). It is thought that there are many.
- an additive for example, polyvinyl alcohol (PVA)
- PVA polyvinyl alcohol
- the particles present in the aqueous dispersion have a small number of “coarse particles”.
- an additive for example, polyvinyl alcohol
- the number of the coarse particles serving as the nucleus of the aggregation is small, so that the aggregation of the particles can be suppressed, Alternatively, the size of the aggregated particles decreases.
- the number of particles (effective number of particles) acting on the surface to be polished per unit area is maintained, and the specific surface area of the particles in contact with the surface to be polished is maintained. .
- the slurry is visually transparent (having a high light transmittance) and visually turbid ( It has been found that some of them have low light transmittance. From this, it is thought that even a very small amount of the coarse particles which can cause the above-mentioned action can not be detected by a general particle size measuring device, contributes to the reduction of the polishing rate.
- the present inventor has found that the above problem can be solved by using particles having a high light transmittance in the aqueous dispersion by devising a method for producing the particles.
- the light transmittance can be measured with a spectrophotometer. Specifically, for example, it can be measured with a spectrophotometer U3310 manufactured by Hitachi, Ltd.
- an aqueous dispersion in which the content of the second particles is adjusted to 1.0% by mass is prepared as a measurement sample. Approximately 4 mL of this measurement sample is placed in a 1 cm square cell, and the cell is set in the apparatus before measurement.
- the absorbance and light transmittance given to the aqueous dispersion by the second particles contained in the slurry are such that after removing solid components other than the second particles and liquid components other than water, the aqueous dispersion having a predetermined content is removed.
- the solid component or the liquid component can be removed, for example, by centrifugation using a centrifugal machine capable of applying a gravitational acceleration of several thousand G or less, or a gravitational acceleration of tens of thousands G or more.
- Centrifugation methods such as ultracentrifugation using an ultracentrifuge; chromatography methods such as partition chromatography, adsorption chromatography, gel permeation chromatography, and ion exchange chromatography; natural filtration, vacuum filtration, pressure filtration, and ultrafiltration Filtration methods such as filtration; distillation methods such as distillation under reduced pressure and atmospheric pressure can be used, and these may be appropriately combined.
- the method of separating the second particles includes a chromatography method, a filtration method, and the like. At least one selected from the group consisting of ultrafiltration is preferred.
- a filtration method is used, particles contained in the slurry can be passed through a filter by setting appropriate conditions.
- examples of the method for separating the second particles include a chromatography method, a filtration method, and a distillation method.
- the method for separating the second particles includes a filtration method and a centrifugal separation method.
- the filtrate is used, and in the case of centrifugation, the liquid phase is used.
- the liquid phase is used.
- separation can be performed under the following centrifugation conditions.
- Centrifuge Optima MAX-TL (manufactured by Beckman Coulter, Inc.) Centrifugal acceleration: 5.8 ⁇ 10 4 G Processing time: 5 minutes Processing temperature: 25 ° C
- the second particles can be separated and / or other components can be separated under the following conditions.
- Sample solution 100 ⁇ L of slurry Detector: UV-VIS detector, manufactured by Hitachi, Ltd., trade name "L-4200" Wavelength: 400nm Integrator: GPC integrator manufactured by Hitachi, Ltd., product name "D-2500” Pump: Hitachi Ltd.
- the second particles cannot be fractionated even under the above conditions, but in that case, the sample solution amount, column type, eluent type, measurement temperature, flow rate, etc. are optimized. Can be separated. Further, by adjusting the pH of the slurry, there is a possibility that the distillation time of the components contained in the slurry is adjusted and the slurry can be separated from the second particles. When there is an insoluble component in the slurry, it is preferable to remove the insoluble component by filtration, centrifugation or the like as necessary.
- 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”.
- 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 absorbance for light at 380 nm exceeds zero. In this case, the polishing rate of silicon oxide containing carbon can be further improved.
- the reasons why the polishing rate is improved as described above include, for example, the following reasons.
- the reason is not limited to the following. That is, if the absorbance of the liquid phase obtained when the slurry is centrifuged at a wavelength of 380 nm exceeds 0, the composite particles are easily removed selectively by such centrifugation, and the separated particles (hereinafter, referred to as “ For example, it is possible to obtain a liquid phase containing, as a solid component, a second particle which is not in contact with the first particle), and if the absorbance exceeds 0, the abrasive grains are not dispersed in the slurry. Free particles (eg, second particles that are not in contact with the first particles) are included in addition to the composite particles.
- the free particles have a smaller particle size than the composite particles, the diffusion speed in the slurry is high, and the free particles are preferentially adsorbed on the surface of silicon oxide containing carbon to cover the surface.
- the composite particles act not only directly on the carbon-containing silicon oxide, but also on the free particles adsorbed on the carbon-containing silicon oxide, and indirectly act on the carbon-containing silicon oxide. (Eg, mechanical action can be transferred to carbon-containing silicon oxide via free particles adsorbed on the carbon-containing silicon oxide).
- the absorbance for light having a wavelength of 380 nm in a liquid phase obtained when the slurry according to the present embodiment is centrifuged at a centrifugal acceleration of 5.8 ⁇ 10 4 G for 5 minutes is preferably in the following range.
- the absorbance is preferably 0.001 or more, more preferably 0.002 or more, still more preferably 0.01 or more, and particularly preferably 0.03 or more.
- 0.05 or more is very preferable, 0.08 or more is very preferable, 0.09 or more is still more preferable, 0.1 or more is further preferable, and 0.2 or more is particularly preferable.
- the absorbance is preferably 0.5 or less, more preferably 0.4 or less, still more preferably 0.3 or less, and particularly preferably 0.25 or less. 0.22 or less is very preferable. From the above viewpoint, the absorbance is more preferably more than 0 and 0.5 or less. The absorbance can be adjusted by adjusting the content of free particles in the abrasive grains.
- the absorbance can be reduced by reducing the number of revolutions in stirring the liquid containing the first particles and the second particles, weakening the electrostatic repulsion generated between the particles, and the like.
- an abrasive having an absorbance of 0 for light having a wavelength of 380 nm in a liquid phase obtained when the slurry is centrifuged may be used.
- Such abrasive grains can be obtained by removing free particles by centrifugation.
- the light transmittance for light having a wavelength of 500 nm is preferably 50% / cm or more, more preferably 60% / cm or more, still more preferably 70% / cm or more, and 80% / cm. cm / cm or more, particularly preferably 90% / cm or more, and very preferably 92% / cm or more.
- the upper limit of the light transmittance is 100% / cm.
- the lower limit of the pH of the slurry according to the present embodiment is preferably 2.0 or more, more preferably 2.5 or more, and still more preferably 2.8 or more, from the viewpoint of further improving the polishing rate of silicon oxide containing carbon. 3.0 or more is particularly preferable, 3.2 or more is extremely preferable, 3.5 or more is very preferable, 4.0 or more is still more preferable, 4.2 or more is further preferable, and 4.3 or more is particularly 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 surface to be polished contains silicon oxide containing carbon.
- 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.
- silicon oxide containing carbon can be used as the material to be polished.
- 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 in the form of a film (a film to be polished), or may be a silicon oxide film containing carbon or the like.
- the material to be polished formed on such a substrate is polished with the slurry, and an excess portion is removed, thereby eliminating irregularities on the surface of the material to be polished and forming a smooth surface over the entire surface of the material to be polished. Obtainable.
- 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.
- the surface to be polished containing silicon oxide containing carbon can be polished.
- 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 silicon oxide containing carbon is preferably 50 nm / min or more, more preferably 100 nm / min or more, further preferably 120 nm / min or more, and particularly preferably 150 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 insulating materials other than silicon oxide containing carbon.
- insulating 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; optical devices such as optical switching elements and optical waveguides.
- 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.
- a method for producing abrasive grains including a step of bringing first particles containing a cerium oxide into contact with second particles containing a cerium compound.
- a slurry manufacturing method including a step of obtaining abrasive grains by the abrasive grain manufacturing method.
- 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.
- cerium hydroxide slurry (particle content: 1.0% by mass) was placed in a 1 cm square cell, and the cell was placed in a spectrophotometer (device name: U3310) manufactured by Hitachi, Ltd.
- the absorbance was measured in the wavelength range of 200 to 600 nm, and the absorbance for light having a wavelength of 400 nm and the light transmittance for light having a wavelength of 500 nm were measured.
- the absorbance for light having a wavelength of 400 nm was 2.25, and the light transmittance for light having a wavelength of 500 nm was 92% / cm.
- Example 1 20 g of the cerium hydroxide slurry and 1940 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 mixed solution while stirring the mixed solution, 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: 0.01% by mass, pH: 4.1) was prepared.
- the pH of the test slurry was measured using a model number PHL-40 manufactured by Toa DKK Corporation (the same applies hereinafter).
- 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, pH: 3.9) was prepared.
- Example 3 30 g of the cerium hydroxide slurry, 50 g of ion-exchanged water, and 20 g of the cerium oxide slurry were sequentially added to a cylindrical container containing zirconia beads having a diameter of 1 mm to obtain a mixed solution. Subsequently, the mixture was placed on a mix rotor (device name: MR-5) manufactured by AS ONE Corporation and stirred at 100 rpm. After that, 900 g of ion-exchanged water was added, followed by stirring.
- MR-5 mix rotor manufactured by AS ONE Corporation
- 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: 0.03% by mass, pH: 4.4) was prepared.
- zeta potential of abrasive grains An appropriate amount of test slurry was put into a trade name “DelsaNano C” manufactured by Beckman Coulter, Inc. The measurement was performed twice at 25 ° C., and the average value of the displayed zeta potential was adopted.
- the zeta potential of Examples 1 to 3 was +55 mV
- the zeta potential of Comparative Example 1 was -55 mV
- the zeta potential of Comparative Example 2 was +50 mV
- the zeta potential of Comparative Example 3 was -35 mV.
- a test solution was prepared by adjusting the content (total amount of particles) of abrasive grains in the test slurry (excluding Comparative Example 3) to 0.1% by mass (diluted with ion-exchanged water). 7.5 g of the test solution is placed in a centrifuge (trade name: Optima MAX-TL) manufactured by Beckman Coulter, Inc., and treated at a centrifugal acceleration of 5.8 ⁇ 10 4 G at a set temperature of 25 ° C. for 5 minutes to obtain a supernatant. I got
- ⁇ CMP evaluation> 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 values of the zeta potential, the average particle diameter of the abrasive grains, and the pH in the CMP polishing liquid were equivalent to the values of the test slurry described above.
- Polishing device MIRRA3400 (manufactured by APPLIED MATERIALS) Flow rate of CMP polishing liquid: 250 mL / min Substrate to be Polished: As a blanket wafer on which no pattern was formed, a substrate to be polished having a black diamond film (BD film, manufactured by Applied Materials) having a thickness of 2 ⁇ m formed on a silicon substrate by a plasma CVD method was used.
- BD film black diamond film, manufactured by Applied Materials
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
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、炭素を含む酸化珪素を研磨するためのスラリである。炭素を含む酸化珪素としては、ブラックダイヤモンド等が挙げられる。
また、炭素を含む酸化珪素では、炭素を含まない場合と比較して疎水性が強くなる傾向がある。この場合、水等の液状媒体を含有するスラリに対する酸化珪素の親和性が低くなる傾向があり、従来の粒子を用いた場合には研磨速度の低下を招きやすい。一方、上述の複合粒子を研磨に用いると、上述の研磨速度向上の相乗効果が得られることにより、比較的親和性が低い被研磨材料(炭素を含む酸化珪素)に対しても充分な研磨作用が発揮される。
以上により、本実施形態に係るスラリを用いることにより、炭素を含む酸化珪素の研磨速度を向上させることができると推察される。
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む。第2の粒子の粒径は、第1の粒子の粒径よりも小さい。第1の粒子及び第2の粒子の粒径の大小関係は、複合粒子のSEM画像等から判別することができる。
吸光度 =-LOG10(光透過率[%]/100)
(a)第2の粒子が、当該第2の粒子の含有量を1.0質量%に調整した水分散液において波長400nmの光に対して吸光度1.00以上を与える。
(b)第2の粒子が、当該第2の粒子の含有量を0.0065質量%に調整した水分散液において波長290nmの光に対して吸光度1.000以上を与える。
遠心分離機:Optima MAX-TL(ベックマン・コールター株式会社製)
遠心加速度:5.8×104G
処理時間:5分
処理温度:25℃
試料溶液:スラリ100μL
検出器:株式会社日立製作所製、UV-VISディテクター、商品名「L-4200」
波長:400nm
インテグレータ:株式会社日立製作所製、GPCインテグレータ、商品名「D-2500」
ポンプ:株式会社日立製作所製、商品名「L-7100」
カラム:日立化成株式会社製、水系HPLC用充填カラム、商品名「GL-W550S」
溶離液:脱イオン水
測定温度:23℃
流速:1mL/min(圧力は40~50kg/cm2程度)
測定時間:60分
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。
砥粒の含有量が0.1質量%である場合において、本実施形態に係るスラリを遠心加速度5.8×104Gで5分間遠心分離したときに得られる液相(上澄み液)における波長380nmの光に対する吸光度は0を超えることが好ましい。この場合、炭素を含む酸化珪素の研磨速度を更に向上させることができる。
すなわち、スラリを遠心分離したときに得られる液相における波長380nmの光に対する吸光度が0を超える場合、このような遠心分離では、複合粒子が選択的に除去されやすく、遊離した粒子(以下、「遊離粒子」という。例えば、第1の粒子と接触していない第2の粒子)を固形分として含有する液相を得ることが可能であり、吸光度が0を超える場合、砥粒は、スラリにおいて複合粒子に加えて遊離粒子(例えば、第1の粒子と接触していない第2の粒子)を含む。遊離粒子は複合粒子と比較して粒径が小さいため、スラリ中における拡散速度が高く、炭素を含む酸化珪素の表面に優先的に吸着して当該表面を被覆する。この場合、複合粒子は、炭素を含む酸化珪素に直接的に作用するだけでなく、炭素を含む酸化珪素に吸着した遊離粒子にも作用して、炭素を含む酸化珪素に間接的にも作用することができる(例えば、炭素を含む酸化珪素に吸着した遊離粒子を介して、炭素を含む酸化珪素へ機械的作用を伝達することができる)。
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。被研磨面は、炭素を含む酸化珪素を含有する。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。
セリウム水酸化物スラリを適量採取し、粒子の含有量が0.0065質量%(65ppm)となるように水で希釈して測定サンプル(水分散液)を得た。この測定サンプルを1cm角のセルに約4mL入れ、株式会社日立製作所製の分光光度計(装置名:U3310)内にセルを設置した。波長200~600nmの範囲で吸光度測定を行い、波長290nmの光に対する吸光度と、波長450~600nmの光に対する吸光度とを測定した。波長290nmの光に対する吸光度は1.192であり、波長450~600nmの光に対する吸光度は0.010未満であった。
(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20gと、イオン交換水1940g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:0.01質量%、pH:4.1)を調製した。試験用スラリのpHは、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(以下同様)。
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%、pH:3.9)を調製した。
1mm径のジルコニア製ビーズが入った円筒形状の容器に前記セリウム水酸化物スラリ30g、イオン交換水50g、及び、前記セリウム酸化物スラリ20gを順次添加して混合液を得た。続いて、前記混合液をアズワン株式会社製のミックスローター(装置名:MR-5)上に設置して100rpmで撹拌した。その後、イオン交換水900gを添加した後に撹拌した。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:0.03質量%、pH:4.4)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%、pH:8.0)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%、pH:4.0)を調製した。
コロイダルシリカの分散液(扶桑化学工業株式会社製、商品名:クオートロンPL-3)をイオン交換水で希釈して試験用スラリ(シリカ粒子の含有量:0.1質量%、pH:7.0)を調製した。
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。実施例1~3のゼータ電位は+55mVであり、比較例1のゼータ電位は-55mVであり、比較例2のゼータ電位は+50mVであり、比較例3のゼータ電位は-35mVであった。
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内に上述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。表示された平均粒径値を砥粒の平均粒径(平均二次粒径)として得た。実施例1の平均粒径は220nmであり、実施例2~3の平均粒径は155nmであり、比較例1の平均粒径は145nmであり、比較例2の平均粒径は10nmであり、比較例3の平均粒径は60nmであった。
前記試験用スラリ(比較例3を除く)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)して試験液を調製した。試験液7.5gをベックマン・コールター株式会社製の遠心分離機(商品名:Optima MAX-TL)に入れ、遠心加速度5.8×104G、設定温度25℃で5分間処理して上澄み液を得た。
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研磨液におけるゼータ電位、砥粒の平均粒径、及び、pH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:MIRRA3400(APPLIED MATERIALS社製)
CMP研磨液の流量:250mL/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のブラックダイヤモンド膜(BD膜、Applied Materials社製)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:20.7kPa(3.0psi)
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。
研磨速度(RR)=(研磨前後でのブラックダイヤモンド膜の膜厚差[nm])/(研磨時間:1[min])
Claims (5)
- 炭素を含む酸化珪素を研磨するためのスラリであって、
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の粒子の粒径が第1の粒子の粒径よりも小さく、
前記第1の粒子がセリウム酸化物を含有し、
前記第2の粒子がセリウム化合物を含有する、スラリ。 - 前記砥粒の含有量が0.1質量%である場合において遠心加速度5.8×104Gで5分間前記スラリを遠心分離したときに得られる液相における波長380nmの光に対する吸光度が0を超える、請求項1に記載のスラリ。
- 前記セリウム化合物がセリウム水酸化物を含む、請求項1又は2に記載のスラリ。
- 前記砥粒の含有量が0.01~10質量%である、請求項1~3のいずれか一項に記載のスラリ。
- 請求項1~4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。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020547634A JP6888744B2 (ja) | 2018-09-25 | 2018-09-25 | スラリ及び研磨方法 |
| CN201880097934.8A CN112740366B (zh) | 2018-09-25 | 2018-09-25 | 浆料及研磨方法 |
| PCT/JP2018/035445 WO2020065723A1 (ja) | 2018-09-25 | 2018-09-25 | スラリ及び研磨方法 |
| US17/278,974 US12247140B2 (en) | 2018-09-25 | 2018-09-25 | Slurry and polishing method |
| KR1020217010330A KR102382508B1 (ko) | 2018-09-25 | 2018-09-25 | 슬러리 및 연마 방법 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/035445 WO2020065723A1 (ja) | 2018-09-25 | 2018-09-25 | スラリ及び研磨方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020065723A1 true WO2020065723A1 (ja) | 2020-04-02 |
Family
ID=69953415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2018/035445 Ceased WO2020065723A1 (ja) | 2018-09-25 | 2018-09-25 | スラリ及び研磨方法 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12247140B2 (ja) |
| JP (1) | JP6888744B2 (ja) |
| KR (1) | KR102382508B1 (ja) |
| CN (1) | CN112740366B (ja) |
| WO (1) | WO2020065723A1 (ja) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022171565A (ja) * | 2021-04-30 | 2022-11-11 | 株式会社フジミインコーポレーテッド | 研磨用組成物、研磨方法および研磨済基板の製造方法 |
| JP2023010682A (ja) * | 2021-07-08 | 2023-01-20 | エスケーシー ソルミックス カンパニー,リミテッド | 半導体工程用研磨組成物及びそれを用いた研磨された物品の製造方法 |
| JP7534508B1 (ja) | 2023-09-28 | 2024-08-14 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
| US12590225B2 (en) | 2021-04-30 | 2026-03-31 | Fujimi Incorporated | Polishing composition, polishing method, and method for producing polished substrate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020021680A1 (ja) * | 2018-07-26 | 2020-01-30 | 日立化成株式会社 | スラリ及び研磨方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011054906A (ja) * | 2009-09-04 | 2011-03-17 | Hitachi Chem Co Ltd | スラリーの保存方法及び保存容器 |
| JP2012238831A (ja) * | 2011-01-25 | 2012-12-06 | Hitachi Chem Co Ltd | Cmp研磨液及びその製造方法、複合粒子の製造方法、並びに基体の研磨方法 |
| WO2013125445A1 (ja) * | 2012-02-21 | 2013-08-29 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP2017110177A (ja) * | 2015-12-14 | 2017-06-22 | 日立化成株式会社 | 研磨液、研磨液セット及び基体の研磨方法 |
Family Cites Families (73)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5700180A (en) | 1993-08-25 | 1997-12-23 | Micron Technology, Inc. | System for real-time control of semiconductor wafer polishing |
| JP3278532B2 (ja) | 1994-07-08 | 2002-04-30 | 株式会社東芝 | 半導体装置の製造方法 |
| TW311905B (ja) | 1994-07-11 | 1997-08-01 | Nissan Chemical Ind Ltd | |
| KR100336598B1 (ko) | 1996-02-07 | 2002-05-16 | 이사오 우치가사키 | 산화 세륨 연마제 제조용 산화 세륨 입자 |
| JPH10154672A (ja) | 1996-09-30 | 1998-06-09 | Hitachi Chem Co Ltd | 酸化セリウム研磨剤及び基板の研磨法 |
| JPH10106994A (ja) | 1997-01-28 | 1998-04-24 | Hitachi Chem Co Ltd | 酸化セリウム研磨剤及び基板の研磨法 |
| CN1290162C (zh) | 2001-02-20 | 2006-12-13 | 日立化成工业株式会社 | 抛光剂及基片的抛光方法 |
| US6821897B2 (en) | 2001-12-05 | 2004-11-23 | Cabot Microelectronics Corporation | Method for copper CMP using polymeric complexing agents |
| US7071105B2 (en) | 2003-02-03 | 2006-07-04 | Cabot Microelectronics Corporation | Method of polishing a silicon-containing dielectric |
| US6939211B2 (en) | 2003-10-09 | 2005-09-06 | Micron Technology, Inc. | Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions |
| US7112123B2 (en) | 2004-06-14 | 2006-09-26 | Amcol International Corporation | Chemical-mechanical polishing (CMP) slurry containing clay and CeO2 abrasive particles and method of planarizing surfaces |
| US20050119360A1 (en) | 2003-11-28 | 2005-06-02 | Kabushiki Kaisha Kobe Seiko Sho | Method for producing porous material |
| JP2006249129A (ja) | 2005-03-08 | 2006-09-21 | Hitachi Chem Co Ltd | 研磨剤の製造方法及び研磨剤 |
| KR101267971B1 (ko) | 2005-08-31 | 2013-05-27 | 가부시키가이샤 후지미인코퍼레이티드 | 연마용 조성물 및 연마 방법 |
| JP5105869B2 (ja) | 2006-04-27 | 2012-12-26 | 花王株式会社 | 研磨液組成物 |
| JP2008112990A (ja) | 2006-10-04 | 2008-05-15 | Hitachi Chem Co Ltd | 研磨剤及び基板の研磨方法 |
| JP5281758B2 (ja) | 2007-05-24 | 2013-09-04 | ユシロ化学工業株式会社 | 研磨用組成物 |
| KR101184731B1 (ko) | 2008-03-20 | 2012-09-20 | 주식회사 엘지화학 | 산화세륨 제조 방법, 이로부터 얻어진 산화세륨 및 이를 포함하는 cmp슬러리 |
| CN102766407B (zh) | 2008-04-23 | 2016-04-27 | 日立化成株式会社 | 研磨剂及使用该研磨剂的基板研磨方法 |
| JP5287174B2 (ja) * | 2008-04-30 | 2013-09-11 | 日立化成株式会社 | 研磨剤及び研磨方法 |
| TW201038690A (en) | 2008-09-26 | 2010-11-01 | Rhodia Operations | Abrasive compositions for chemical mechanical polishing and methods for using same |
| JP2010153781A (ja) | 2008-11-20 | 2010-07-08 | Hitachi Chem Co Ltd | 基板の研磨方法 |
| JP5397386B2 (ja) | 2008-12-11 | 2014-01-22 | 日立化成株式会社 | Cmp用研磨液及びこれを用いた研磨方法 |
| KR101075491B1 (ko) * | 2009-01-16 | 2011-10-21 | 주식회사 하이닉스반도체 | 반도체 소자의 제조방법 |
| KR20140027561A (ko) | 2009-06-09 | 2014-03-06 | 히타치가세이가부시끼가이샤 | 연마제, 연마제 세트 및 기판의 연마 방법 |
| WO2011007588A1 (ja) | 2009-07-16 | 2011-01-20 | 日立化成工業株式会社 | パラジウム研磨用cmp研磨液及び研磨方法 |
| KR101172647B1 (ko) | 2009-10-22 | 2012-08-08 | 히다치 가세고교 가부시끼가이샤 | 연마제, 농축 1액식 연마제, 2액식 연마제 및 기판의 연마 방법 |
| JP2011142284A (ja) | 2009-12-10 | 2011-07-21 | Hitachi Chem Co Ltd | Cmp研磨液、基板の研磨方法及び電子部品 |
| KR101907863B1 (ko) | 2010-09-08 | 2018-10-15 | 바스프 에스이 | 수성 폴리싱 조성물, 및 전기적, 기계적 및 광학적 장치용 기판 재료의 화학적 기계적 폴리싱 방법 |
| CN103222036B (zh) | 2010-11-22 | 2016-11-09 | 日立化成株式会社 | 悬浮液、研磨液套剂、研磨液、基板的研磨方法及基板 |
| KR20130129398A (ko) | 2010-11-22 | 2013-11-28 | 히타치가세이가부시끼가이샤 | 지립의 제조 방법, 슬러리의 제조 방법 및 연마액의 제조 방법 |
| CN103497732B (zh) | 2010-11-22 | 2016-08-10 | 日立化成株式会社 | 悬浮液、研磨液套剂、研磨液、基板的研磨方法及基板 |
| JP2012186339A (ja) | 2011-03-07 | 2012-09-27 | Hitachi Chem Co Ltd | 研磨液及びこの研磨液を用いた基板の研磨方法 |
| JP2015088495A (ja) | 2012-02-21 | 2015-05-07 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP2014099581A (ja) * | 2012-04-27 | 2014-05-29 | Hitachi Chemical Co Ltd | スラリー、研磨液セット、研磨液、基体の研磨方法及び基体 |
| JP5943073B2 (ja) | 2012-05-22 | 2016-06-29 | 日立化成株式会社 | スラリー、研磨液セット、研磨液及び基体の研磨方法 |
| WO2014034358A1 (ja) | 2012-08-30 | 2014-03-06 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP2014060205A (ja) | 2012-09-14 | 2014-04-03 | Fujimi Inc | 研磨用組成物 |
| JP6139975B2 (ja) | 2013-05-15 | 2017-05-31 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
| KR102225154B1 (ko) | 2013-06-12 | 2021-03-09 | 쇼와덴코머티리얼즈가부시끼가이샤 | Cmp용 연마액 및 연마 방법 |
| WO2014208414A1 (ja) | 2013-06-27 | 2014-12-31 | コニカミノルタ株式会社 | 酸化セリウム研磨材、酸化セリウム研磨材の製造方法及び研磨加工方法 |
| JP6428625B2 (ja) | 2013-08-30 | 2018-11-28 | 日立化成株式会社 | スラリー、研磨液セット、研磨液、及び、基体の研磨方法 |
| US9340706B2 (en) | 2013-10-10 | 2016-05-17 | Cabot Microelectronics Corporation | Mixed abrasive polishing compositions |
| WO2015052988A1 (ja) | 2013-10-10 | 2015-04-16 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP6223786B2 (ja) | 2013-11-12 | 2017-11-01 | 花王株式会社 | 硬脆材料用研磨液組成物 |
| JP6256482B2 (ja) | 2013-12-26 | 2018-01-10 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP6360311B2 (ja) | 2014-01-21 | 2018-07-18 | 株式会社フジミインコーポレーテッド | 研磨用組成物およびその製造方法 |
| WO2016006553A1 (ja) | 2014-07-09 | 2016-01-14 | 日立化成株式会社 | Cmp用研磨液及び研磨方法 |
| KR101613359B1 (ko) | 2014-07-15 | 2016-04-27 | 에스케이하이닉스 주식회사 | 화학적 기계적 연마용 나노 세리아 슬러리 조성물 및 이의 제조방법 |
| JP6435689B2 (ja) | 2014-07-25 | 2018-12-12 | Agc株式会社 | 研磨剤と研磨方法、および研磨用添加液 |
| CN106661429B (zh) | 2014-08-26 | 2019-07-05 | 凯斯科技股份有限公司 | 抛光浆料组合物 |
| JP2016069535A (ja) | 2014-09-30 | 2016-05-09 | 株式会社フジミインコーポレーテッド | 研磨用組成物及びその製造方法並びに研磨方法 |
| US9422455B2 (en) | 2014-12-12 | 2016-08-23 | Cabot Microelectronics Corporation | CMP compositions exhibiting reduced dishing in STI wafer polishing |
| JP2016154208A (ja) | 2015-02-12 | 2016-08-25 | 旭硝子株式会社 | 研磨剤、研磨方法および半導体集積回路装置の製造方法 |
| CN107406752B (zh) | 2015-03-10 | 2020-05-08 | 日立化成株式会社 | 研磨剂、研磨剂用储存液和研磨方法 |
| KR101761792B1 (ko) | 2015-07-02 | 2017-07-26 | 주식회사 케이씨텍 | Sti 연마용 슬러리 조성물 |
| US11046869B2 (en) | 2015-09-09 | 2021-06-29 | Showa Denko Materials Co., Ltd. | Polishing liquid, polishing liquid set, and substrate polishing method |
| JP6570382B2 (ja) | 2015-09-09 | 2019-09-04 | デンカ株式会社 | 研磨用シリカ添加剤及びそれを用いた方法 |
| KR101737938B1 (ko) | 2015-12-15 | 2017-05-19 | 주식회사 케이씨텍 | 다기능성 연마 슬러리 조성물 |
| KR101761789B1 (ko) | 2015-12-24 | 2017-07-26 | 주식회사 케이씨텍 | 첨가제 조성물 및 이를 포함하는 포지티브 연마 슬러리 조성물 |
| CN108473850A (zh) * | 2016-01-06 | 2018-08-31 | 嘉柏微电子材料股份公司 | 低k基板的抛光方法 |
| CN108603076A (zh) | 2016-02-16 | 2018-09-28 | 3M创新有限公司 | 抛光系统以及制备和使用抛光系统的方法 |
| JP2017203076A (ja) | 2016-05-10 | 2017-11-16 | 日立化成株式会社 | Cmp研磨剤及びこれを用いた研磨方法 |
| WO2018012174A1 (ja) | 2016-07-15 | 2018-01-18 | 株式会社フジミインコーポレーテッド | 研磨用組成物、研磨用組成物の製造方法および研磨方法 |
| KR101823083B1 (ko) | 2016-09-07 | 2018-01-30 | 주식회사 케이씨텍 | 표면개질된 콜로이달 세리아 연마입자, 그의 제조방법 및 그를 포함하는 연마 슬러리 조성물 |
| JP6720791B2 (ja) | 2016-09-13 | 2020-07-08 | Agc株式会社 | 研磨剤と研磨方法、および研磨用添加液 |
| KR102619722B1 (ko) | 2016-10-27 | 2024-01-02 | 삼성디스플레이 주식회사 | 트랜지스터 표시판의 제조 방법 및 이에 이용되는 연마 슬러리 |
| WO2018179064A1 (ja) * | 2017-03-27 | 2018-10-04 | 日立化成株式会社 | スラリ及び研磨方法 |
| US11649377B2 (en) | 2017-08-14 | 2023-05-16 | Resonac Corporation | Polishing liquid, polishing liquid set and polishing method |
| CN111566179B (zh) | 2017-11-15 | 2022-03-04 | 圣戈本陶瓷及塑料股份有限公司 | 用于实施材料去除操作的组合物及其形成方法 |
| WO2020021680A1 (ja) * | 2018-07-26 | 2020-01-30 | 日立化成株式会社 | スラリ及び研磨方法 |
| US11572490B2 (en) | 2018-03-22 | 2023-02-07 | Showa Denko Materials Co., Ltd. | Polishing liquid, polishing liquid set, and polishing method |
| JP7056728B2 (ja) * | 2018-03-22 | 2022-04-19 | 昭和電工マテリアルズ株式会社 | 研磨液、研磨液セット及び研磨方法 |
-
2018
- 2018-09-25 JP JP2020547634A patent/JP6888744B2/ja active Active
- 2018-09-25 WO PCT/JP2018/035445 patent/WO2020065723A1/ja not_active Ceased
- 2018-09-25 US US17/278,974 patent/US12247140B2/en active Active
- 2018-09-25 CN CN201880097934.8A patent/CN112740366B/zh active Active
- 2018-09-25 KR KR1020217010330A patent/KR102382508B1/ko active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011054906A (ja) * | 2009-09-04 | 2011-03-17 | Hitachi Chem Co Ltd | スラリーの保存方法及び保存容器 |
| JP2012238831A (ja) * | 2011-01-25 | 2012-12-06 | Hitachi Chem Co Ltd | Cmp研磨液及びその製造方法、複合粒子の製造方法、並びに基体の研磨方法 |
| WO2013125445A1 (ja) * | 2012-02-21 | 2013-08-29 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
| JP2017110177A (ja) * | 2015-12-14 | 2017-06-22 | 日立化成株式会社 | 研磨液、研磨液セット及び基体の研磨方法 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022171565A (ja) * | 2021-04-30 | 2022-11-11 | 株式会社フジミインコーポレーテッド | 研磨用組成物、研磨方法および研磨済基板の製造方法 |
| US12590225B2 (en) | 2021-04-30 | 2026-03-31 | Fujimi Incorporated | Polishing composition, polishing method, and method for producing polished substrate |
| JP2023010682A (ja) * | 2021-07-08 | 2023-01-20 | エスケーシー ソルミックス カンパニー,リミテッド | 半導体工程用研磨組成物及びそれを用いた研磨された物品の製造方法 |
| JP7373026B2 (ja) | 2021-07-08 | 2023-11-01 | エスケー エンパルス カンパニー リミテッド | 半導体工程用研磨組成物及びそれを用いた研磨された物品の製造方法 |
| JP7534508B1 (ja) | 2023-09-28 | 2024-08-14 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
| JP2025058909A (ja) * | 2023-09-28 | 2025-04-09 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
| JP2025057133A (ja) * | 2023-09-28 | 2025-04-09 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
| JP7809759B2 (ja) | 2023-09-28 | 2026-02-02 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6888744B2 (ja) | 2021-06-16 |
| KR20210047951A (ko) | 2021-04-30 |
| CN112740366A (zh) | 2021-04-30 |
| JPWO2020065723A1 (ja) | 2021-08-30 |
| CN112740366B (zh) | 2024-08-02 |
| KR102382508B1 (ko) | 2022-04-01 |
| US12247140B2 (en) | 2025-03-11 |
| US20220033680A1 (en) | 2022-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6966000B2 (ja) | スラリ及び研磨方法 | |
| JP6888744B2 (ja) | スラリ及び研磨方法 | |
| JPWO2018179787A1 (ja) | 研磨液、研磨液セット及び研磨方法 | |
| TWI768008B (zh) | 研漿以及研磨方法 | |
| JPWO2018179062A1 (ja) | 研磨液、研磨液セット、添加液及び研磨方法 | |
| WO2019043819A1 (ja) | スラリ及び研磨方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18935974 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2020547634 Country of ref document: JP Kind code of ref document: A |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 20217010330 Country of ref document: KR Kind code of ref document: A |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 18935974 Country of ref document: EP Kind code of ref document: A1 |
|
| WWG | Wipo information: grant in national office |
Ref document number: 17278974 Country of ref document: US |
