WO2024089922A1 - 砥粒及びその選定方法、研磨液、複数液式研磨液、研磨方法、部品の製造方法、並びに、半導体部品の製造方法 - Google Patents
砥粒及びその選定方法、研磨液、複数液式研磨液、研磨方法、部品の製造方法、並びに、半導体部品の製造方法 Download PDFInfo
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- WO2024089922A1 WO2024089922A1 PCT/JP2023/017468 JP2023017468W WO2024089922A1 WO 2024089922 A1 WO2024089922 A1 WO 2024089922A1 JP 2023017468 W JP2023017468 W JP 2023017468W WO 2024089922 A1 WO2024089922 A1 WO 2024089922A1
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- abrasive grains
- polishing
- polished
- mass
- cerium
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Classifications
-
- 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
- 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
- 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
-
- 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
- C09K3/1409—Abrasive particles per se
- C09K3/1418—Abrasive particles per se obtained by division of a mass agglomerated by sintering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
-
- 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
Definitions
- This disclosure relates to abrasive grains and methods for selecting the same, polishing fluids, multiple-liquid polishing fluids, polishing methods, component manufacturing methods, semiconductor component manufacturing methods, etc.
- CMP Chemical Mechanical Polishing
- STI shallow trench isolation
- Known polishing solutions used in CMP include those containing abrasive grains containing cerium (see, for example, Patent Documents 1 and 2 below).
- polishing liquids containing abrasive grains it is required to adjust the polishing speed of the material being polished depending on the application, and new methods for adjusting the polishing speed of the material being polished are required. Also, for polishing liquids containing abrasive grains, it may be required to increase the polishing speed of silicon oxide in a pattern wafer, for example, in a pattern area having a linear silicon nitride pattern (Line)/silicon oxide pattern (Space) with a line width of 50 ⁇ m/50 ⁇ m (a pattern area in which linear silicon nitride patterns with a line width of 50 ⁇ m and linear silicon oxide patterns with a line width of 50 ⁇ m are alternately arranged).
- Line linear silicon nitride pattern
- Space space
- One aspect of the present disclosure is to provide a method for selecting abrasive grains capable of adjusting the polishing speed of a material to be polished. Another aspect of the present disclosure is to provide abrasive grains having a high polishing speed of silicon oxide in a pattern area having a linear silicon nitride pattern/silicon oxide pattern with a line width of 50 ⁇ m/50 ⁇ m. Another aspect of the present disclosure is to provide a polishing liquid containing the abrasive grains. Another aspect of the present disclosure is to provide a multi-liquid polishing liquid using the abrasive grains. Another aspect of the present disclosure is to provide a polishing method using the polishing liquid. Another aspect of the present disclosure is to provide a method for manufacturing a part using a polished member polished by the polishing method. Another aspect of the present disclosure is to provide a method for manufacturing a semiconductor part using a polished member polished by the polishing method.
- the present disclosure relates in some aspects to the following items [1] to [12] etc.
- [1] A method for selecting abrasive grains, the abrasive grains containing cerium being selected based on the value of a short-lifetime component of a positron lifetime measured by a positron annihilation method.
- [2] The method for selecting abrasive grains according to [1], wherein the abrasive grains contain cerium oxide.
- the abrasive grain according to [3] which contains cerium oxide.
- [5] The abrasive grain according to [3] or [4], which contains cerium oxide derived from a cerium complex of trimesic acid.
- [6] The abrasive grain according to any one of [3] to [5], which contains cerium oxide derived from cerium hydroxide.
- a multiple-liquid polishing liquid comprising a first liquid containing abrasive grains and water, and a second liquid containing water and components other than the abrasive grains and water, wherein the abrasive grains are abrasive grains selected by the abrasive grain selection method described in [1] or [2], or abrasive grains described in any one of [3] to [6].
- a polishing method comprising polishing a workpiece using the polishing liquid according to [7].
- the polishing method according to [9] wherein the polished member contains silicon oxide.
- a method for manufacturing a part comprising obtaining a part using a polished member polished by the polishing method according to [9] or [10].
- a method for producing a semiconductor component comprising obtaining a semiconductor component using a polished member polished by the polishing method according to [9] or [10].
- a method for selecting abrasive grains capable of adjusting the polishing speed of a material to be polished can be provided.
- abrasive grains having a high polishing speed of silicon oxide in a pattern area having a linear silicon nitride pattern/silicon oxide pattern with a line width of 50 ⁇ m/50 ⁇ m can be provided.
- a polishing liquid containing the abrasive grains can be provided.
- a multi-liquid polishing liquid using the abrasive grains can be provided.
- a polishing method using the polishing liquid can be provided.
- a method for manufacturing a part using a polished member polished by the polishing method can be provided.
- a method for manufacturing a semiconductor part using a polished member polished by the polishing method can be provided.
- the numerical range indicated using “ ⁇ ” indicates a range including the numerical values described before and after “ ⁇ ” as the minimum and maximum values, respectively.
- “A or more” in the numerical range means a range exceeding A and A.
- “A or less” in the numerical range means a range less than A and A.
- the upper limit or lower limit of a numerical range of a certain stage can be arbitrarily combined with the upper limit or lower limit of a numerical range of another stage.
- the upper limit or lower limit of the numerical range may be replaced with a value shown in an experimental example.
- “A or B” may include either A or B, or may include both.
- the materials exemplified in this specification may be used alone or in combination of two or more types.
- the content of each component in the composition means the total amount of the multiple substances present in the composition, unless otherwise specified.
- the term “process” includes not only independent processes, but also processes that cannot be clearly distinguished from other processes, as long as the intended effect of the process is achieved.
- “Abrasive grain” refers to a collection of multiple particles, but for convenience, a single particle that makes up an abrasive grain is sometimes called an abrasive grain.
- the abrasive grains and the selection method thereof according to this embodiment are abrasive grains used in a polishing liquid and a selection method thereof.
- the abrasive grains contain cerium.
- the selection method of the abrasive grains according to this embodiment the abrasive grains are selected based on the short-lifetime component value of the positron lifetime measured by positron annihilation spectroscopy.
- the abrasive grains according to this embodiment have an arbitrary value as the short-lifetime component value of the positron lifetime (the positron lifetime of the abrasive grains) measured by positron annihilation spectroscopy, depending on the application.
- the short-lifetime component value of the positron lifetime is the smallest positron lifetime among the positron lifetimes derived from the sample when a four-component analysis is performed using the Kapton component and the adhesive component as radiation source components.
- abrasive grains containing cerium The inventors have focused on abrasive grains containing cerium and discovered that by adjusting the short-lived component value of the positron lifetime of the abrasive grains measured by positron annihilation spectroscopy, it is possible to adjust the polishing speed of the material to be polished when the material is polished using the abrasive grains.
- abrasive grains and the selection method thereof of this embodiment abrasive grains are selected based on the short-lived component value of the positron lifetime measured by positron annihilation spectroscopy, and the polishing speed of the material to be polished when the material is polished using such abrasive grains can be adjusted.
- a polishing speed adjustment method that adjusts the polishing speed of the material to be polished based on the short-lived component value of the positron lifetime of the abrasive grains (the short-lived component value of the positron lifetime measured by positron annihilation spectroscopy).
- the polishing speed of the material being polished on the patterned wafer can be adjusted.
- the polishing speed of the material being polished can be adjusted so as to increase the polishing speed of the material being polished, and it is also possible to adjust the polishing speed of the material being polished so as to decrease the polishing speed of the material being polished.
- the polishing speed of the insulating material can be adjusted, and the polishing speed of silicon oxide can be adjusted.
- the abrasive grains may contain cerium (cerium element) and may contain a cerium compound.
- the cerium compound include cerium oxide, cerium hydroxide, ammonium cerium nitrate, cerium acetate, cerium sulfate (e.g., cerium sulfate hydrate), cerium bromate, cerium bromide, cerium chloride, cerium oxalate, cerium nitrate, and cerium carbonate.
- the abrasive grains may contain cerium oxide from the viewpoint of easily adjusting the polishing speed of the material to be polished or from the viewpoint of easily increasing the polishing speed of the material to be polished (such as the polishing speed of silicon oxide on a patterned wafer; the same applies below).
- the cerium oxide may be CeO 2 (cerium (IV) oxide, ceria) or Ce 2 O 3 (cerium (III) oxide).
- the abrasive grains may contain cerium oxide derived from a cerium source, or may contain a calcined product of the cerium source.
- a cerium source a cerium salt or a cerium complex may be used.
- the abrasive grains may contain cerium oxide derived from a cerium salt, or may contain cerium oxide derived from a cerium complex.
- the cerium complex may include a cerium complex of a compound A having a carbon chain (a complex having a ligand of compound A and cerium) from the viewpoint of easily increasing the polishing speed of the material to be polished.
- Compound A may include at least one selected from the group consisting of a carboxy group and a carboxylate group from the viewpoint of easily increasing the polishing speed of the material to be polished.
- the number of carboxy groups or the total number of carboxy groups and carboxylate groups may be 1 to 4, 1 to 3, 2 to 4, 2 to 3, or 3 to 4 from the viewpoint of easily increasing the polishing speed of the material to be polished.
- Compound A may have at least one selected from the group consisting of a linear (acyclic) carbon chain and a cyclic carbon chain, and may have a cyclic carbon chain, from the viewpoint of easily increasing the polishing speed of the material to be polished.
- the cyclic carbon chain may be an alicyclic ring, a heterocyclic ring, or an aromatic ring.
- Compound A may have an aromatic ring from the viewpoint of easily increasing the polishing speed of the material to be polished.
- the cerium complex may include a cerium complex of an aromatic carboxylic acid, a cerium complex of benzenetricarboxylic acid, or a cerium complex of trimesic acid.
- the cerium complex may include a metal organic framework.
- Cerium sources include cerium carbonate (excluding cerium oxycarbonate), cerium oxycarbonate, cerium complex of trimesic acid, cerium acetate, cerium stearate, cerium nitrate, cerium sulfate, cerium oxalate, cerium hydroxide, etc.
- the abrasive grains may contain at least one selected from the group consisting of cerium oxide derived from a cerium complex of trimesic acid (e.g., a calcined product of a cerium complex of trimesic acid) and cerium oxide derived from cerium hydroxide (e.g., a calcined product of cerium hydroxide).
- the abrasive grains may be in an embodiment that contains cerium oxide derived from a cerium complex of trimesic acid, or in an embodiment that contains cerium oxide derived from cerium hydroxide.
- the abrasive grains according to the present embodiment may be obtained by processing a raw material containing cerium (raw material for obtaining abrasive grains), for example, by crushing the raw material containing cerium (raw material for obtaining abrasive grains).
- the manufacturing method of the abrasive grains according to the present embodiment may have a processing step of processing the raw material containing cerium (raw material for obtaining abrasive grains), for example, a crushing step of crushing the raw material containing cerium (raw material for obtaining abrasive grains) to obtain a crushed material.
- the shape of the raw material containing cerium is not particularly limited, and may be, for example, particulate, fibrous, flake, liquid (for example, highly viscous liquid), etc.
- the manufacturing method of the abrasive grains according to the present embodiment may include a classification step of classifying the crushed material after the crushing step.
- coarse objects for example, coarse particles
- the crushing method in the crushing step is not particularly limited, and various crushing methods such as wet crushing and dry crushing can be used.
- the classification method in the classification step is not particularly limited, and may be centrifugation, etc.
- the method for producing abrasive grains according to this embodiment may include a raw material preparation step in which the above-mentioned cerium source (e.g., cerium salt) is oxidized to obtain a raw material containing cerium (raw material for obtaining abrasive grains) prior to the treatment step (e.g., the grinding step).
- the oxidation method include a calcination method in which the cerium source is calcined at 600 to 900°C or the like; and a chemical oxidation method in which the cerium source is oxidized using an oxidizing agent such as hydrogen peroxide.
- the time it takes for a positron incident on a material to annihilate can be measured to evaluate atomic-level defects, intermolecular voids, pore structures, and the like.
- the measurement of the positron lifetime can obtain the short-lifetime component value of the positron lifetime and the long-lifetime component value of the positron lifetime.
- the short-lifetime component value of the positron lifetime is the smallest positron lifetime among the positron lifetimes derived from a sample when a four-component analysis is performed using two components, a Kapton component and an adhesive component, as radiation source components after the positron lifetime is measured by the positron annihilation method, and the long-lifetime component value of the positron lifetime is the second smallest positron lifetime among the positron lifetimes derived from a sample when the four-component analysis is performed.
- the short-lifetime component value of the positron lifetime can be used, for example, as an index of a single oxygen defect.
- the short-lifetime component value of the positron lifetime can be measured by the method described in the experimental example below.
- the short-lifetime component value of the positron lifetime can be adjusted by the manufacturing conditions of the abrasive grains, etc. For example, the higher the firing temperature of the cerium source when obtaining a raw material containing cerium (raw material for obtaining abrasive grains), the smaller (shorter) the positron lifetime tends to be.
- the inventors have found that by using abrasive grains having a short-lifetime component value of 190 ps or less of the positron lifetime measured by positron annihilation spectroscopy, it is easy to increase the polishing speed of silicon oxide on a patterned wafer, and in particular, it is easy to increase the polishing speed of silicon oxide in a patterned region having a linear silicon nitride pattern/silicon oxide pattern with a line width of 50 ⁇ m/50 ⁇ m (a patterned region in which linear silicon nitride patterns with a line width of 50 ⁇ m and linear silicon oxide patterns with a line width of 50 ⁇ m are alternately arranged).
- One aspect of the abrasive grains according to this embodiment contains cerium, and has a short-lifetime component value of 190 ps or less of the positron lifetime measured by positron annihilation spectroscopy.
- Such abrasive grains make it easy to increase the polishing speed of silicon oxide on a patterned wafer, and in particular, it is easy to increase the polishing speed of silicon oxide in a patterned region having a linear silicon nitride pattern/silicon oxide pattern with a line width of 50 ⁇ m/50 ⁇ m.
- the polishing speed of silicon oxide in a pattern area having a linear silicon nitride pattern/silicon oxide pattern with line widths of 50 ⁇ m/50 ⁇ m can be obtained to be, for example, 13 nm/min or more (preferably, 15 nm/min or more, 20 nm/min or more, 25 nm/min or more, 30 nm/min or more, 35 nm/min or more, etc.).
- abrasive grains of this embodiment it is easy to increase the polishing speed of silicon oxide in a pattern region having a linear silicon nitride pattern/silicon oxide pattern with a line width of 20 ⁇ m/80 ⁇ m (a pattern region in which linear silicon nitride patterns with a line width of 20 ⁇ m and linear silicon oxide patterns with a line width of 80 ⁇ m are alternately arranged).
- a polishing speed of silicon oxide of, for example, 25.5 nm/min or more (preferably, 30 nm/min or more, 35 nm/min or more, 40 nm/min or more, 45 nm/min or more, 50 nm/min or more, etc.) in a pattern region having a linear silicon nitride pattern/silicon oxide pattern with a line width of 20 ⁇ m/80 ⁇ m.
- the reasons why a high polishing speed is likely to be obtained are not limited to the above.
- the smaller the short-lifetime component value of the positron lifetime in the abrasive grains the easier it is to obtain ideal crystals.
- the mechanical polishing power of the abrasive grains is likely to be maintained at a high level, making it easier to obtain a high polishing speed.
- the short-lifetime component value of the positron lifetime (the positron lifetime of the abrasive grains) measured by the positron annihilation method may be in the following ranges.
- the short-lifetime component value of the positron lifetime may be 400 ps or less, 350 ps or less, 300 ps or less, 250 ps or less, or 200 ps or less, from the viewpoint of easily adjusting the polishing speed of the material being polished.
- the short-lifetime component value of the positron lifetime may be 190 ps or less, 185 ps or less, 180 ps or less, 175 ps or less, 170 ps or less, or 165 ps or less, from the viewpoint of easily increasing the polishing speed of the material being polished (such as the polishing speed of silicon oxide on a patterned wafer).
- the short-lifetime component value of the positron lifetime may be 100 ps or more, 120 ps or more, 150 ps or more, 160 ps or more, or 165 ps or more, from the viewpoint of easily adjusting the polishing speed of the material being polished.
- the value of the short-lifetime component of the positron lifetime may be 100-400 ps, 100-190 ps, 100-165 ps, 150-400 ps, 150-190 ps, 150-165 ps, 165-400 ps, or 165-190 ps.
- the method for selecting abrasive grains includes a selection process for selecting abrasive grains based on the value of the short-lifetime component of the positron lifetime measured by positron annihilation spectroscopy.
- abrasive grains may be selected based on whether the value of the short-lifetime component of the positron lifetime is within any of the above-mentioned ranges (for example, whether the value of the short-lifetime component of the positron lifetime is 190 ps or less).
- the polishing liquid according to this embodiment contains the abrasive grains according to this embodiment and water, and may contain abrasive grains selected by the abrasive grain selection method according to this embodiment and water.
- the polishing liquid according to this embodiment may contain, in addition to the abrasive grains and water, components other than the abrasive grains and water (e.g., various components described below).
- the multiple-liquid polishing liquid according to this embodiment includes liquid A (first liquid) containing the abrasive grains according to this embodiment and water, and liquid B (second liquid) containing components other than the abrasive grains and water (e.g., various components described below) and water.
- the abrasive grains of liquid A may be abrasive grains selected by the abrasive grain selection method according to this embodiment.
- Liquid A may contain components other than the abrasive grains and water (e.g., various components described below), or may not contain components other than the abrasive grains and water (e.g., various components described below).
- the polishing liquid may be obtained by mixing the abrasive grains according to this embodiment (e.g., the abrasive grains obtained by the method for producing abrasive grains according to this embodiment) with water, and the polishing liquid may be obtained by mixing liquids A and B of the multiple-liquid polishing liquid according to this embodiment.
- Liquid A can be obtained by mixing the abrasive grains according to this embodiment (e.g., the abrasive grains obtained by the method for producing abrasive grains according to this embodiment) with water.
- Liquid A may be multiple liquids, for example, multiple liquids with different types of abrasive grains.
- Liquid B may be multiple liquids, for example, multiple liquids with different types of components other than abrasive grains and water.
- the content of abrasive grains may be within the following ranges based on the total mass of the polishing liquid or the total mass of water. From the viewpoint of easily increasing the polishing rate of the material being polished, the content of abrasive grains may be 0.01 mass% or more, 0.05 mass% or more, 0.1 mass% or more, 0.2 mass% or more, 0.3 mass% or more, 0.4 mass% or more, or 0.5 mass% or more.
- the content of the abrasive grains may be 10% by mass or less, 8% by mass or less, 5% by mass or less, 3% by mass or less, 1% by mass or less, 0.8% by mass or less, or 0.5% by mass or less, from the viewpoint of easily suppressing an increase in the viscosity of the polishing liquid, aggregation of the abrasive grains, etc. From these viewpoints, the content of the abrasive grains may be 0.01 to 10% by mass, 0.01 to 5% by mass, 0.01 to 1% by mass, 0.05 to 10% by mass, 0.05 to 5% by mass, 0.05 to 1% by mass, 0.1 to 10% by mass, 0.1 to 5% by mass, or 0.1 to 1% by mass.
- Water may be contained as the remainder after removing other components from the polishing liquid.
- the water content may be in the following ranges based on the total mass of the polishing liquid.
- the water content may be 90 mass% or more, 91 mass% or more, 92 mass% or more, 93 mass% or more, 94 mass% or more, 95 mass% or more, 96 mass% or more, 97 mass% or more, 98 mass% or more, or 99 mass% or more.
- the water content may be less than 100 mass%, 99.9 mass% or less, 99.8 mass% or less, 99.7 mass% or less, 99.6 mass% or less, or 99.5 mass% or less. From these perspectives, the water content may be 90 mass% or more and less than 100 mass%, 95 mass% or more and less than 100 mass%, or 98 mass% or more and less than 100 mass%.
- the polishing liquid according to this embodiment may contain a phosphate compound as necessary.
- the phosphate compound may be used as a dispersant for the abrasive grains.
- As the phosphate compound at least one selected from the group consisting of phosphates and their derivatives (phosphate derivatives) may be used.
- As the hydrogen phosphate compound at least one selected from the group consisting of hydrogen phosphates and their derivatives (hydrogen phosphate derivatives) may be used.
- Phosphate salts include potassium phosphate salts, sodium phosphate salts, ammonium phosphate salts, calcium phosphate salts, etc., and more specifically, tripotassium phosphate, trisodium phosphate, ammonium phosphate, tricalcium phosphate, etc.
- Phosphate derivatives include sodium diphosphate, potassium diphosphate, potassium polyphosphate, ammonium polyphosphate, calcium polyphosphate, etc.
- hydrogen phosphate salts include potassium hydrogen phosphate salts, sodium hydrogen phosphate salts, ammonium hydrogen phosphate salts, and calcium hydrogen phosphate salts, and more specifically, dipotassium hydrogen phosphate, disodium hydrogen phosphate, diammonium hydrogen phosphate, calcium hydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, and calcium dihydrogen phosphate.
- hydrogen phosphate salt derivatives include potassium dodecyl hydrogen phosphate, sodium dodecyl hydrogen phosphate, and dodecyl ammonium hydrogen phosphate.
- the polishing liquid according to this embodiment may contain hydrogen phosphate or ammonium dihydrogen phosphate, from the viewpoint of easily increasing the polishing rate of the material to be polished.
- the content of the phosphate compound may be in the following ranges based on the total mass of the polishing liquid or the total mass of water. From the viewpoint of easily increasing the polishing rate of the material to be polished, the content of the phosphate compound may be 0.0001 mass% or more, 0.0005 mass% or more, 0.001 mass% or more, 0.002 mass% or more, 0.003 mass% or more, 0.004 mass% or more, 0.005 mass% or more, 0.008 mass% or more, or 0.01 mass% or more.
- the content of the phosphate compound may be 1 mass% or less, 0.5 mass% or less, 0.1 mass% or less, 0.08 mass% or less, 0.05 mass% or less, 0.04 mass% or less, 0.03 mass% or less, 0.02 mass% or less, or 0.01 mass% or less. From these viewpoints, the content of the phosphate compound may be 0.0001 to 1 mass%, 0.0001 to 0.1 mass%, 0.0001 to 0.05 mass%, 0.001 to 1 mass%, 0.001 to 0.1 mass%, 0.001 to 0.05 mass%, 0.005 to 1 mass%, 0.005 to 0.1 mass%, or 0.005 to 0.05 mass%.
- the content of the phosphate compound may be in the following ranges per 100 parts by mass of abrasive grains. From the viewpoint of easily increasing the polishing rate of the material to be polished, the content of the phosphate compound may be 0.01 parts by mass or more, 0.05 parts by mass or more, 0.1 parts by mass or more, 0.3 parts by mass or more, 0.5 parts by mass or more, 0.8 parts by mass or more, 1 part by mass or more, 1.2 parts by mass or more, 1.5 parts by mass or more, 1.8 parts by mass or more, or 2 parts by mass or more.
- the content of the phosphate compound may be 50 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, 10 parts by mass or less, 8 parts by mass or less, 5 parts by mass or less, 4 parts by mass or less, 3 parts by mass or less, 2.5 parts by mass or less, or 2 parts by mass or less.
- the content of the phosphate compound may be 0.01 to 50 parts by mass, 0.01 to 10 parts by mass, 0.01 to 5 parts by mass, 0.1 to 50 parts by mass, 0.1 to 10 parts by mass, 0.1 to 5 parts by mass, 0.5 to 50 parts by mass, 0.5 to 10 parts by mass, 0.5 to 5 parts by mass, 1 to 50 parts by mass, 1 to 10 parts by mass, or 1 to 5 parts by mass.
- the polishing liquid according to this embodiment may contain a polymer as necessary.
- the polymer include homopolymers (polyacrylic acid, etc.) of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, etc.; ammonium salts or amine salts of the homopolymers; copolymers of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, etc.
- alkyl acrylates methyl acrylate, ethyl acrylate, etc.
- hydroxyalkyl acrylates hydroxyethyl acrylate, etc.
- alkyl methacrylates methyl methacrylate, ethyl methacrylate, etc.
- hydroxyalkyl methacrylates hydroxyethyl methacrylate, etc.
- styrene compounds styrene, alkylstyrene, styrenesulfonic acid, etc.
- vinyl acetate and vinyl alcohol
- ammonium salts or amine salts of the copolymers styrene compounds
- the polishing liquid according to this embodiment may contain a copolymer having at least one selected from the group consisting of acrylic acid and methacrylic acid and a styrene compound as monomer units, or a copolymer having styrene and acrylic acid as monomer units (styrene/acrylic acid copolymer).
- the polishing liquid according to this embodiment may contain an acid component (excluding compounds corresponding to phosphate compounds) as necessary.
- acid components include organic acids such as propionic acid and acetic acid (excluding compounds corresponding to amino acids); inorganic acids such as nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, and boric acid; and amino acids such as glycine.
- the polishing liquid according to this embodiment may contain components other than the abrasive grains, water, phosphate compound, polymer, and acid component according to this embodiment.
- Such components are not particularly limited, but may include abrasive grains that do not contain cerium; basic compounds, etc.
- the pH of the polishing liquid in this embodiment may be in the following ranges from the viewpoint of easily increasing the polishing rate of the material being polished.
- the pH of the polishing liquid may be 1.0 or more, 1.5 or more, 2.0 or more, 2.5 or more, 3.0 or more, 3.5 or more, 4.0 or more, 4.5 or more, 5.0 or more, 5.5 or more, 6.0 or more, 6.5 or more, 7.0 or more, more than 7.0, 7.5 or more, 8.0 or more, or 8.5 or more.
- the pH of the polishing liquid may be 12.0 or less, 11.5 or less, 11.0 or less, 10.5 or less, 10.0 or less, 9.5 or less, or 9.0 or less.
- the pH of the polishing liquid may be 1.0 to 12.0, 1.0 to 10.0, 1.0 to 9.0, 5.0 to 12.0, 5.0 to 10.0, 5.0 to 9.0, 7.0 to 12.0, 7.0 to 10.0, or 7.0 to 9.0.
- the pH of the polishing liquid according to this embodiment can be measured by the method described in the experimental example below.
- the polishing method according to this embodiment includes a polishing step of polishing a member to be polished using the polishing liquid according to this embodiment (for example, the polishing liquid obtained by the manufacturing method of the polishing liquid according to this embodiment).
- the polishing liquid used in the polishing step may be a polishing liquid obtained by mixing liquid A (first liquid) and liquid B (second liquid) of the multiple liquid type polishing liquid according to this embodiment.
- the surface to be polished of the member to be polished can be polished.
- at least a part of the material to be polished in the member to be polished can be polished and removed. Examples of the material to be polished include insulating materials such as silicon oxide and silicon nitride.
- the member to be polished may contain silicon oxide, or may contain silicon oxide and silicon nitride.
- a pattern area in which linear silicon nitride patterns with a line width of 50 ⁇ m and linear silicon oxide patterns with a line width of 50 ⁇ m are alternately arranged may be polished, and a pattern area in which linear silicon nitride patterns with a line width of 20 ⁇ m and linear silicon oxide patterns with a line width of 80 ⁇ m are alternately arranged may be polished.
- the member to be polished is not particularly limited, and may be a wafer (e.g., a semiconductor wafer) or a chip (e.g., a semiconductor chip).
- the member to be polished may be a wiring board or a circuit board.
- the component manufacturing method according to the present embodiment includes a component manufacturing step of obtaining a component using a member to be polished by the polishing method according to the present embodiment.
- the component according to the present embodiment is a component obtained by the component manufacturing method according to the present embodiment.
- the component according to the present embodiment is not particularly limited, and may be an electronic component (e.g., a semiconductor component such as a semiconductor package), a wafer (e.g., a semiconductor wafer), or a chip (e.g., a semiconductor chip).
- the electronic component manufacturing method according to the present embodiment obtains an electronic component using a member to be polished by the polishing method according to the present embodiment.
- the semiconductor component manufacturing method according to the present embodiment obtains a semiconductor component (e.g., a semiconductor package) using a member to be polished by the polishing method according to the present embodiment.
- the component manufacturing method according to the present embodiment may include a polishing step of polishing the member to be polished by the polishing method according to the present embodiment before the component manufacturing step.
- the component manufacturing method according to the present embodiment may include, as one aspect of the component manufacturing process, a singulation process for singulating the polished member polished by the polishing method according to the present embodiment.
- the singulation process may be, for example, a process for dicing a wafer (e.g., a semiconductor wafer) polished by the polishing method according to the present embodiment to obtain chips (e.g., semiconductor chips).
- the electronic component manufacturing method according to the present embodiment may include a process for singulating the polished member polished by the polishing method according to the present embodiment to obtain electronic components (e.g., semiconductor components).
- the semiconductor component manufacturing method according to the present embodiment may include a process for singulating the polished member polished by the polishing method according to the present embodiment to obtain semiconductor components (e.g., semiconductor packages).
- the manufacturing method of the component according to the present embodiment may include, as one aspect of the component manufacturing process, a connection process for connecting (e.g., electrically connecting) the polished member polished by the polishing method according to the present embodiment to another connected object.
- the connected object to be connected to the polished member polished by the polishing method according to the present embodiment is not particularly limited, and may be the polished member polished by the polishing method according to the present embodiment, or may be a connected object different from the polished member polished by the polishing method according to the present embodiment.
- the polished member and the connected object may be directly connected (connected in a state where the polished member and the connected object are in contact with each other), or the polished member and the connected object may be connected via another member (such as a conductive member).
- the connection process may be performed before the singulation process, after the singulation process, or before or after the singulation process.
- the connecting step may be a step of connecting the polished surface of the polished member polished by the polishing method according to this embodiment to the connected body, or may be a step of connecting the connecting surface of the polished member polished by the polishing method according to this embodiment to the connecting surface of the connected body.
- the connecting surface of the polished member may be the polished surface polished by the polishing method according to this embodiment.
- the connecting step can obtain a connected body including the polished member and the connected body.
- the connecting step if the connecting surface of the polished member has a metal part, the connected body may be brought into contact with the metal part.
- the connecting step if the connecting surface of the polished member has a metal part and the connecting surface of the connected body has a metal part, the metal parts may be brought into contact with each other.
- the metal part may contain, for example, copper.
- the device according to this embodiment (e.g., an electronic device such as a semiconductor device) comprises a polished member polished by the polishing method according to this embodiment, and at least one selected from the group consisting of the parts according to this embodiment.
- cerium oxide particles The cerium source shown in Table 1 was calcined in air at 800° C. for 1 hour using an electric furnace to obtain cerium oxide particles (ceria particles).
- the cerium complex of trimesic acid was prepared by the following procedure. First, a trimesic acid solution was prepared by adding 34.7 g (165 mmol) of trimesic acid (1,3,5-BTC: 1,3,5-Benzene tricarboxylic acid, manufactured by Tokyo Chemical Industry Co., Ltd.) to 480 mL of a water/ethanol mixed solvent (mass ratio 1:1). In addition, an aqueous cerium nitrate solution was prepared by adding 71.2 g (164 mmol) of cerium nitrate hexahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) to 20 mL of water.
- mixed solution A After obtaining mixed solution A by adding the above-mentioned aqueous cerium nitrate solution to the above-mentioned trimesic acid solution, mixed solution A was stirred at 25 ° C. and 400 rpm for 5 hours using a magnetic stirrer. After solid content (white precipitate) was generated in mixed solution A, mixed solution A was left to stand for 15 hours. After the solid content was redispersed by stirring the mixed solution A, the mixed solution A was placed in a 50 mL centrifuge tube and centrifuged at 5000 rpm for 5 minutes.
- the above suspension was subjected to a dispersion process for 30 minutes using an ultrasonic dispersion device (manufactured by SND Co., Ltd., product name "US-105").
- an ultrasonic dispersion device manufactured by SND Co., Ltd., product name "US-105".
- the cerium oxide particles in the above suspension were ground (wet ground) using a bead mill (manufactured by Ashizawa Finetech Co., Ltd., product name: Labostar Mini, model number: DMS65) until the particle size reached approximately 200 nm.
- a classification process was performed using a centrifuge (manufactured by Eppendorf Himac Technologies Co., Ltd., product name: CF-15R) to remove coarse particles in the above-mentioned suspension and to make the particle size uniform to about 150 nm, thereby obtaining an aqueous dispersion of abrasive grains.
- the classification process was performed by placing 50 g of the suspension in a centrifuge tube and centrifuging at 1500 to 3700 min -1 for 5 minutes.
- aqueous dispersion was centrifuged using a centrifuge (manufactured by Eppendorf Himac Technologies, product name: CF-15R) and the supernatant was removed to obtain a solid content.
- the centrifugation was performed by placing 50 g of the suspension in a centrifuge tube and centrifuging for 25 minutes at 8000 min ⁇ 1 .
- the solid content was then dried at 30° C. for 15 hours using a vacuum constant temperature dryer (manufactured by Yamato Scientific Co., Ltd., product name: ADP200), and the solid content was then crushed in a mortar to obtain abrasive grains.
- the above-mentioned abrasive grains were filled to a height of 5 mm in a powder measurement cell, and the positron lifetime (positron annihilation lifetime) was measured under the following conditions using the positron annihilation method.
- positron lifetime positron annihilation lifetime
- a four-component analysis was performed, including the lifetime and strength of the Kapton and adhesive contained in the radiation source.
- the lifetime ⁇ 1 of the Kapton contained in the radiation source is known to be 0.38 ns, which is close to the positron lifetime of the sample, so in order to correctly measure the positron lifetime of the sample, it is necessary to fix the intensity I1 of the Kapton contained in the radiation source. Since I1 is known to be around 20-35%, it was fixed at 30% in this measurement.
- ⁇ 2 is the lifetime of the adhesive contained in the radiation source, and I2, which corresponds to this lifetime, indicates the strength of the adhesive contained in the radiation source.
- Measuring device Product name "PSA Type L-II” manufactured by Toyo Seiko Co., Ltd.
- Positron source Thin-film positron source (manufactured by Japan Radioisotope Association) Total count: 1,000,000 counts
- the above-mentioned aqueous dispersion was diluted with water to obtain a polishing liquid. Based on the total mass of the polishing liquid, the content of the abrasive grains was 0.5 mass % and the content of ammonium dihydrogen phosphate was 0.01 mass %.
- the pH of the polishing solution was measured using a compact pH meter (manufactured by Horiba Ltd., product name: LAQUA twin). After two-point calibration of the pH meter using two types of pH buffer solutions (pH 4.01 and pH 6.86) as standard buffer solutions, the pH meter sensor was placed in the polishing solution, and the pH was measured after the pH had stabilized. The liquid temperatures of both the standard buffer solutions and the polishing solution were 25°C. The measurement results are shown in Table 1.
- a patterned wafer was fabricated by the following procedure. First, a product name "8"SEMATECH864" (Stop on Nitride) manufactured by SEMATECH was prepared. This wafer was obtained by forming a SiN film as a stopper film on a part of a silicon substrate having a diameter of 200 mm, etching the silicon substrate of the part without the SiN film by 350 nm to form a recess, and then forming a 600 nm SiO2 film on the stopper film and in the recess by a plasma CVD method.
- a patterned wafer was obtained having a patterned region in which the line width (L/S; unit ⁇ m) of the SiN pattern (Line) and the SiO2 pattern (Space) is 50/50, and a patterned region in which the line width (L/S; unit ⁇ m) of the SiN pattern (Line) and the SiO2 pattern (Space) is 20/80.
- the above-mentioned patterned wafer was attached to a holder for mounting a substrate to which an adsorption pad was attached.
- the holder was placed on a platen to which a polishing pad (Nitta DuPont Co., Ltd., product name: IC1010) was attached, so that the surface to be polished faced the polishing pad.
- the platen was rotated at 120 min -1 , and the holder was rotated together with the platen, thereby performing polishing for 60 seconds.
- the patterned wafer after polishing was thoroughly washed with pure water and then dried.
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Abstract
Description
[1]砥粒の選定方法であって、前記砥粒がセリウムを含み、陽電子消滅法により測定される陽電子寿命の短寿命成分値に基づき前記砥粒を選定する、砥粒の選定方法。
[2]前記砥粒がセリウム酸化物を含む、[1]に記載の砥粒の選定方法。
[3]セリウムを含み、陽電子消滅法により測定される陽電子寿命の短寿命成分値が190ps以下である、砥粒。
[4]セリウム酸化物を含む、[3]に記載の砥粒。
[5]トリメシン酸のセリウム錯体由来のセリウム酸化物を含む、[3]又は[4]に記載の砥粒。
[6]水酸化セリウム由来のセリウム酸化物を含む、[3]~[5]のいずれか一つに記載の砥粒。
[7][1]又は[2]に記載の砥粒の選定方法により選定された砥粒、又は、[3]~[6]のいずれか一つに記載の砥粒と、水と、を含有する、研磨液。
[8]砥粒と、水と、を含有する第1の液、並びに、前記砥粒及び水以外の成分と、水と、を含有する第2の液を備え、前記砥粒が、[1]又は[2]に記載の砥粒の選定方法により選定された砥粒、又は、[3]~[6]のいずれか一つに記載の砥粒である、複数液式研磨液。
[9][7]に記載の研磨液を用いて被研磨部材を研磨する、研磨方法。
[10]前記被研磨部材が酸化ケイ素を含む、[9]に記載の研磨方法。
[11][9]又は[10]に記載の研磨方法により研磨された被研磨部材を用いて部品を得る、部品の製造方法。
[12][9]又は[10]に記載の研磨方法により研磨された被研磨部材を用いて半導体部品を得る、半導体部品の製造方法。
電気炉を用いて表1のセリウム源を800℃、空気下で1時間焼成することによりセリウム酸化物粒子(セリア粒子)を得た。
上述のセリウム酸化物粒子と、リン酸二水素アンモニウムと、水とを混合することにより懸濁液を得た。セリウム酸化物粒子の含有量は、懸濁液の全質量を基準として5質量%であり、リン酸二水素アンモニウムの含有量は、セリウム酸化物粒子100質量部に対して2質量部であった。
上述の砥粒の陽電子寿命の短寿命成分値を下記の手順で測定した。測定結果を表1に示す。
測定装置:東洋精鋼株式会社製、商品名「PSA Type L-II」
陽電子線源:薄膜陽電子線源(公益社団法人日本アイソトープ協会製)
総カウント数:1000000カウント
上述の水分散液を水で希釈することにより研磨液を得た。研磨液の全質量を基準として、砥粒の含有量は0.5質量%であり、リン酸二水素アンモニウムの含有量は0.01質量%であった。
パターンウエハ(PTW)を次の手順で作製した。まず、SEMATECH製の商品名「8” SEMATECH864」(Stop on Nitride)を準備した。このウエハは、直径200mmのシリコン基板上の一部にストッパ膜としてSiN膜を形成すると共に、SiN膜の無い部分のシリコン基板を350nmエッチングして凹部を形成し、次いで、プラズマCVD法で600nmのSiO2膜をストッパ膜上及び凹部内に成膜して得られたウエハである。次に、このウエハを20mm×20mmに切り抜くことにより、SiNパターン(Line)及びSiO2パターン(Space)の線幅(L/S;単位μm)が50/50であるパターン領域、並びに、SiNパターン(Line)及びSiO2パターン(Space)の線幅(L/S;単位μm)が20/80であるパターン領域を有するパターンウエハを得た。
Claims (12)
- 砥粒の選定方法であって、
前記砥粒がセリウムを含み、
陽電子消滅法により測定される陽電子寿命の短寿命成分値に基づき前記砥粒を選定する、砥粒の選定方法。 - 前記砥粒がセリウム酸化物を含む、請求項1に記載の砥粒の選定方法。
- セリウムを含み、
陽電子消滅法により測定される陽電子寿命の短寿命成分値が190ps以下である、砥粒。 - セリウム酸化物を含む、請求項3に記載の砥粒。
- トリメシン酸のセリウム錯体由来のセリウム酸化物を含む、請求項3に記載の砥粒。
- 水酸化セリウム由来のセリウム酸化物を含む、請求項3に記載の砥粒。
- 請求項3~6のいずれか一項に記載の砥粒と、水と、を含有する、研磨液。
- 請求項3~6のいずれか一項に記載の砥粒と、水と、を含有する第1の液、並びに、前記砥粒及び水以外の成分と、水と、を含有する第2の液を備える、複数液式研磨液。
- 請求項7に記載の研磨液を用いて被研磨部材を研磨する、研磨方法。
- 前記被研磨部材が酸化ケイ素を含む、請求項9に記載の研磨方法。
- 請求項9に記載の研磨方法により研磨された被研磨部材を用いて部品を得る、部品の製造方法。
- 請求項9に記載の研磨方法により研磨された被研磨部材を用いて半導体部品を得る、半導体部品の製造方法。
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| KR101465600B1 (ko) * | 2012-12-31 | 2014-11-27 | 주식회사 케이씨텍 | 세륨계 연마입자와 이를 포함하는 슬러리 및 그 제조 방법 |
| JP2015120845A (ja) * | 2013-12-24 | 2015-07-02 | 旭硝子株式会社 | 研磨剤の製造方法、研磨方法および半導体集積回路装置の製造方法 |
| CN106915761B (zh) * | 2015-12-28 | 2021-04-30 | 安集微电子科技(上海)股份有限公司 | 一种氧化铈制备方法及其在sti化学机械抛光中的应用 |
| SG11201906571TA (en) * | 2017-01-16 | 2019-08-27 | Jgc Catalysts & Chemicals Ltd | Polishing composition |
| US20210189176A1 (en) * | 2017-09-29 | 2021-06-24 | Hitachi Chemical Company, Ltd. | Polishing solution, polishing solution set, and polishing method |
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2023
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| JP2006116617A (ja) * | 2004-10-19 | 2006-05-11 | Hitachi Maxell Ltd | 固定砥粒研削研磨用工具とその製造方法、並びに固定砥粒研削研磨用工具を用いた被研磨体の研磨方法 |
| WO2022070923A1 (ja) * | 2020-09-30 | 2022-04-07 | 昭和電工マテリアルズ株式会社 | スラリ、研磨方法及び半導体部品の製造方法 |
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| WO2024089919A1 (ja) | 2024-05-02 |
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| KR20250093485A (ko) | 2025-06-24 |
| JPWO2024089920A1 (ja) | 2024-05-02 |
| CN119110790A (zh) | 2024-12-10 |
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| US20250263593A1 (en) | 2025-08-21 |
| US20250263594A1 (en) | 2025-08-21 |
| CN119095932A (zh) | 2024-12-06 |
| KR20250093484A (ko) | 2025-06-24 |
| CN119110791A (zh) | 2024-12-10 |
| JPWO2024089923A1 (ja) | 2024-05-02 |
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