WO2015136832A1 - 研磨組成物及び研磨方法並びに研磨組成物の製造方法 - Google Patents
研磨組成物及び研磨方法並びに研磨組成物の製造方法 Download PDFInfo
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- WO2015136832A1 WO2015136832A1 PCT/JP2015/000490 JP2015000490W WO2015136832A1 WO 2015136832 A1 WO2015136832 A1 WO 2015136832A1 JP 2015000490 W JP2015000490 W JP 2015000490W WO 2015136832 A1 WO2015136832 A1 WO 2015136832A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
- C09K3/1445—Composite particles, e.g. coated particles the coating consisting exclusively of metals
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
Definitions
- the present invention relates to a polishing composition, a polishing method, and a manufacturing method of the polishing composition.
- CMP Chemical mechanical polishing
- This CMP is used in a wiring process in which a metal material such as tungsten, copper, or aluminum is embedded in a groove formed on an insulating layer of a semiconductor substrate, and the metal layer deposited in the groove portion is polished and removed (Patent Document). 1).
- a metal material such as tungsten, copper, or aluminum
- Patent Document 2 In recent years, in order to further improve the performance of a semiconductor memory element or the like, it has been studied to use a metal material for an element portion such as a gate electrode, and CMP is also used in the manufacturing process of the semiconductor memory element ( Patent Document 2).
- the polishing pad is relatively moved while pressing a semiconductor substrate against the polishing pad attached on a surface plate. At this time, the surface of the semiconductor substrate can be flattened by the chemical reaction by the reagent and the mechanical polishing effect by the abrasive grains.
- inorganic particles such as silicon dioxide, aluminum oxide, silicon carbide, diamond, titanium oxide, zirconium oxide, cerium oxide, and manganese oxide are used as abrasive grains contained in the polishing composition (see Patent Documents 3 and 4). ).
- the important characteristics in the CMP process are the polishing speed and defects derived from the polishing process such as dishing, which is a dent in the scratch or embedded pattern portion.
- the polishing rate is related to the productivity in the semiconductor manufacturing process, and the productivity is reflected in the cost of the semiconductor device. Further, since defects affect the yield and reliability of semiconductor elements, how to suppress the generation of defects in the CMP process is a problem. As described above, as the miniaturization of semiconductor elements progresses, a higher level polishing process has been required.
- the present invention has been made in view of the above problems, and has a high polishing rate in a semiconductor substrate polishing process, particularly a chemical mechanical polishing process of a semiconductor substrate having a metal layer such as tungsten, and the semiconductor device. It is an object of the present invention to provide a polishing composition and a polishing method that suppress the occurrence of defects such as scratches and dishing that cause a decrease in reliability, and a method for manufacturing the polishing composition.
- the present invention provides a polishing composition comprising crystalline metal oxide particles as abrasive grains, wherein the metal oxide particles have a maximum diffraction intensity in a powder X-ray diffraction pattern.
- a polishing composition having a peak portion having a half width of less than 1 °.
- the polishing composition contains highly crystalline metal oxide particles in which the half width of the peak portion of the diffraction intensity obtained by powder X-ray diffraction is less than 1 ° as an abrasive grain, the polishing composition has a high polishing rate. The occurrence of defects such as scratches and dishing can be suppressed.
- the average particle diameter of the metal oxide particles is preferably 10 nm or more and 100 nm or less. If the average particle size of the metal oxide particles is 10 nm or more, the polishing rate will not be extremely slow, and if the average particle size is 100 nm or less, the generation of scratches can be prevented.
- the metal oxide particles are any one of titanium oxide, zirconium oxide, cerium oxide, aluminum oxide, manganese oxide, a mixture of at least two of these, or at least one of these metal oxides.
- the composite oxide containing one can be included.
- metal oxide particles containing these are suitable.
- the polishing composition preferably further contains an oxidizing agent.
- the oxidizing agent By including the oxidizing agent, the surface of the semiconductor substrate can be oxidized, and polishing can be effectively promoted.
- the oxidizing agent contains at least one of a peroxide and an iron (III) salt.
- the peroxide preferably contains at least one selected from the group consisting of persulfuric acid, periodic acid, perchloric acid, salts thereof, and hydrogen peroxide.
- iron (III) salt iron sulfate (III), iron nitrate (III), iron chloride (III), iron oxalate (III), tris (oxalato) iron (III) potassium, hexacyanoiron (III) It is preferable to include at least one selected from the group consisting of ammonium, potassium hexacyanoiron (III), iron (III) citrate, iron (III) ammonium citrate, and a water-soluble ferrocene derivative.
- the surface of the semiconductor substrate can be oxidized, and polishing can be more effectively promoted.
- content of the said metal oxide particle is 0.1 to 10 mass%. If the content of the metal oxide particles is 0.1% by mass or more, a sufficient polishing rate can be obtained, and if the content of the metal oxide particles is 10% by mass or less, generation of scratches can be suppressed. It will be possible.
- the polishing composition of the present invention can contain at least one of a dispersant and a pH adjuster. If it is such a polishing composition, it will have a characteristic and pH according to a to-be-polished object and the objective.
- this invention provides the grinding
- polishing method characterized by grind
- the semiconductor substrate preferably includes a metal layer.
- the present invention is suitable for polishing a semiconductor substrate including a metal layer.
- the metal layer is preferably tungsten or a tungsten alloy.
- the present invention is particularly suitable for polishing a semiconductor substrate containing tungsten or a tungsten alloy as a metal layer.
- a method for producing the above polishing composition the step of measuring the half width of the peak portion where the diffraction intensity of the metal oxide particles is maximum by a powder X-ray diffraction method
- a method for producing a polishing composition comprising the step of adding the metal oxide particles having a measured half width of less than 1 ° as abrasive grains to the polishing composition.
- the polishing rate is high and the occurrence of scratches and dishing is suppressed.
- a possible polishing composition can be obtained.
- a high polishing rate can be maintained and the occurrence of defects such as scratches and dishing can be suppressed in the polishing process of a semiconductor substrate, particularly in the CMP of a semiconductor substrate having a metal layer such as tungsten.
- the present inventor has intensively studied to achieve such a problem.
- a highly crystalline metal oxide as the abrasive grain specifically, a metal oxide having a half-value width of less than 1 ° at the peak where the diffraction intensity measured by powder X-ray diffraction is maximum is polished.
- the present invention has been completed by conceiving that the above-mentioned problems can be achieved by adding to the product.
- the polishing composition of the present invention contains a highly crystalline metal oxide in which the half width of the main peak of diffraction intensity measured by powder X-ray diffraction is less than 1 °.
- the half width can be obtained from an X-ray pattern obtained by a ⁇ -2 ⁇ method using, for example, copper K ⁇ ray having a wavelength of 1.5418 ( ⁇ ) as an X-ray source.
- the half-value width means a peak width at a position where the peak intensity is half the peak intensity excluding the background with respect to the peak having the maximum intensity.
- the crystal structure of the metal oxide is not particularly limited, and may be a single crystal phase or a plurality of crystal phases as long as the half width is less than 1 °. good.
- the metal oxide may be a composite oxide, and can be appropriately selected according to the object to be polished and the purpose.
- the metal oxide titanium oxide, zirconium oxide, cerium oxide, aluminum oxide, manganese oxide, or a mixture of at least two of these is preferable.
- the composite oxide is preferably a composite oxide containing at least one metal oxide of titanium oxide, zirconium oxide, cerium oxide, aluminum oxide, and manganese oxide.
- the composite oxide include, but are not limited to, zirconia / ceria composite oxide, alumina / ceria composite oxide, zirconia / yttria composite oxide, and iron / manganese composite oxide.
- the average particle diameter (primary particle diameter) of the metal oxide in polishing composition is 10 nm or more and 100 nm or less.
- the average particle diameter of the metal oxide particles is 10 nm or more, the polishing rate is not extremely slow.
- the average particle diameter is 100 nm or less, the particles are not too large and scratches are not easily generated.
- the average particle diameter of the metal oxide is determined by measuring particle images obtained by a transmission electron microscope (Transmission Electron Microscope: TEM) or a scanning electron microscope (Scanning Electron Microscope: SEM), and having a fixed direction of 100 or more particles.
- the maximum diameter that is, the average value of the Feret diameter can be calculated.
- the measurement method of an average particle diameter is not limited to this, It can measure by another method.
- the polishing composition of the present invention may further contain an oxidizing agent.
- the oxidizing agent is not particularly limited, but is preferably an organic or inorganic compound made of a peroxide or an iron (III) salt.
- peroxide Although it does not specifically limit as a peroxide, although it does not specifically limit as a compound which peracetic acid, periodic acid, perchloric acid, and hydrogen peroxide consist of an iron (III) salt, Iron (III) sulfate, iron nitrate ( III), iron (III) chloride, iron (III) oxalate, potassium tris (oxalato) iron (III), hexacyanoiron (III) ammonium, potassium hexacyanoiron (III), iron (III) citrate, iron citrate (III) Ammonium and water-soluble ferrocene derivatives are preferably included.
- iron (III) salt Iron (III) sulfate, iron nitrate ( III), iron (III) chloride, iron (III) oxalate, potassium tris (oxalato) iron (III), hexacyanoiron (III) ammonium, potassium hexacyanoiron (III), iron (III) citrate, iron citrate (III
- the polishing composition of the present invention contains these oxidizing agents, the surface of the semiconductor substrate can be oxidized and polishing can be effectively promoted.
- the content of the metal oxide particles in the polishing composition is preferably 0.1% by mass or more and 10% by mass or less, and more preferably 0.3% by mass or more and 3% by mass or less.
- the content of the metal oxide is 0.1% by mass or more, a sufficient polishing rate can be obtained, and when the content is 10% by mass or less, defects such as scratches are hardly generated.
- the polishing composition of the present invention preferably contains at least one of a dispersant and a pH adjuster.
- a water-soluble polymer can be added as a dispersant.
- the type, structure, and molecular weight of the water-soluble polymer are not particularly limited, and conventionally known ones can be appropriately selected according to the purpose.
- the water-soluble polymer include, but are not limited to, polycarboxylic acid, polysulfonic acid, polyacrylic acid, polyvinyl pyrrolidone, polyamine, and polyimine.
- pH adjusters examples include inorganic acids such as nitric acid, hydrochloric acid and sulfuric acid, organic acids such as acetic acid, oxalic acid and succinic acid, inorganic bases such as potassium hydroxide and ammonia, tetramethylammonium hydroxide (TMAH) and the like.
- the organic base can be used.
- the pH of the polishing composition in the present invention is not particularly limited, and can be appropriately selected according to the object to be polished and the purpose. For example, when polishing the surface of a semiconductor substrate containing tungsten or a tungsten alloy, the polishing composition preferably has a pH of 1 or more and 6 or less.
- the manufacturing method of the polishing composition of this invention is demonstrated.
- the method for producing highly crystalline metal oxide particles is not particularly limited, and can be appropriately selected according to the purpose.
- a method of obtaining a highly crystalline metal oxide by thermally decomposing a metal oxide precursor produced by a precipitation method or the like see JP 2006-32966 A), or a sol-gel method by hydrolysis of a metal alkoxide ( Japanese Patent Laid-Open No. 2013-18690), spray decomposition method in which metal chloride gas or metal salt is sprayed and decomposed by heat, plasma or the like (see Japanese Patent Laid-Open No. 6-40726), a metal salt solution in a supercritical state Hydrothermal synthesis method in which reaction is performed in water (see JP 2008-137484 A), laser ablation method in which target material is irradiated with laser to instantaneously evaporate and recondense (see International Publication No. 2012/114923) It is done.
- a method for producing highly crystalline metal oxide particles a method in which an oxide of titanium, zinc, or the like is reacted with Ba or the like in an aqueous alkali metal hydroxide solution of 10 molar concentration or more (Japanese Patent Laid-Open No. 2007-31176). And a method in which a metal oxide sol and a metal salt are heated and heat-treated in a flow reactor (see JP 2012-153588 A). The crystallinity of the metal oxide can be controlled by appropriately selecting these production methods and production conditions according to the purpose.
- the method for producing a polishing composition of the present invention includes a step of measuring the half width of the peak portion where the diffraction intensity of the produced metal oxide particles is maximum by a powder X-ray diffraction method.
- the method for producing a polishing composition of the present invention includes a step of adding metal oxide particles having a measured half-value width of less than 1 ° to the polishing composition as abrasive grains after the half-value width measurement step.
- the metal oxide particles can be produced under the same conditions as described above.
- a highly crystalline metal oxide having a half width of less than 1 ° is used as abrasive grains, and a polishing composition capable of realizing a high polishing rate and a low defect can be reliably obtained. Can be manufactured.
- a step of adding the above oxidizing agent, dispersing agent, pH adjusting agent and the like to the polishing composition may be included.
- polishing composition of the present invention can also be used for double-side polishing and chamfered portion polishing.
- the single-side polishing apparatus is a single-side polishing apparatus 10 including a surface plate 3 to which a polishing pad 4 is attached, a polishing composition supply mechanism 5, a polishing head 2, and the like. Can do.
- the semiconductor substrate W is held by the polishing head 2, the polishing composition 1 of the present invention is supplied onto the polishing pad 4 from the polishing composition supply mechanism 5, and the surface plate 3 and the polishing head 2. Each is rotated to bring the surface of the semiconductor substrate W into sliding contact with the polishing pad 4 to perform polishing.
- the semiconductor substrate W may include a metal layer, and the metal layer may be tungsten or a tungsten alloy.
- the polishing method of the present invention is suitable for polishing a surface including a metal layer as an object to be polished, and is particularly suitable for polishing a metal layer made of tungsten or a tungsten alloy.
- the polishing method using the polishing composition of the present invention can suppress the generation of defects such as scratches and dishing on the surface of the semiconductor substrate after polishing, in addition to a high polishing rate.
- Example 1 First, while supplying the polishing composition of the present invention, the surface of the semiconductor substrate was polished on one side, and then the polishing rate and the amount of scratches generated were evaluated.
- the polishing composition used in this single-side polishing was produced as follows. First, titanium oxide having a crystal structure of anatase structure, an X-ray half width of 0.4322 °, and an average particle diameter of 32 nm is dispersed in pure water so that the content is 1.0 mass%. Hydrogen peroxide 1.5 mass% and iron (III) nitrate 0.1 mass% were added to and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition.
- the semiconductor substrate to be polished was a blanket substrate in which a tungsten layer having a thickness of about 800 nm was deposited on a silicon substrate having a diameter of 12 inches (300 mm) via a titanium nitride layer having a thickness of about 10 nm.
- the polishing rate was calculated by dividing the change in the thickness (film thickness) of the tungsten layer before and after polishing by the time (min).
- Evaluation of the amount of scratches generated was observed with a laser microscope (1LM21 manufactured by Lasertec Co., Ltd.) by observing any 10 points near the substrate center on the surface of the blanket substrate after polishing and any 10 points near the substrate periphery. The number of scratches was counted, and the total number of scratches was divided by the total area of the observation area to evaluate the number of scratches per 1 mm 2 .
- a semiconductor substrate to be polished has a pattern in which a trench layer is filled by depositing a tungsten layer of about 600 nm in thickness through a titanium nitride layer of about 1 nm in a linear trench having a width of 100 nm and a depth of 200 nm at intervals of 100 nm.
- a substrate was provided.
- the pattern portion after polishing was cut out, the cross section was observed with an electron microscope, and the difference between the non-pattern region without a groove and the most recessed portion of the tungsten buried portion was evaluated as the dishing amount.
- Example 1 Poli-762 (manufactured by G & P Technology, Inc.) was used as the polishing apparatus, and IC1000 (manufactured by Nitta Haas Co., Ltd.) was used as the polishing pad.
- the polishing conditions were as follows: the load applied to the substrate to be polished was 193 g / cm 2 , the platen rotation speed was 70 rpm, the polishing head rotation speed was 70 rpm, and the slurry (polishing composition) supply rate was 100 mL / min. .
- Example 2 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. First, zirconium oxide having a monoclinic crystal structure, an X-ray half width of 0.4169 °, and an average particle diameter of 35 nm is dispersed in pure water so as to be 1.0% by mass, and then is oxidized. Hydrogen 1.5 mass% and iron nitrate (III) 0.1 mass% were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition.
- Example 3 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. First, ⁇ -aluminum oxide having a crystal structure of a trigonal structure, an X-ray value width of 0.8469 °, and an average particle diameter of 58 nm is dispersed in pure water so as to be 1.0% by mass, and then is oxidized. 1.5% by weight of hydrogen and 0.1% by weight of iron (III) nitrate were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition.
- Example 4 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- zirconium oxide having a monoclinic crystal structure, an X-ray half width of 0.9108 °, and an average particle diameter of 33 nm is dispersed in pure water so as to be 1.0% by weight, and then is oxidized. Hydrogen 1.5 wt% and iron (III) nitrate 0.1 wt% were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition.
- Example 1 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. Colloidal silica having an amorphous (amorphous) structure having a broad peak with an X-ray half width of 5 ° or more and an average particle diameter of 54 nm is set so that the content in the polishing composition is 1.0% by mass. After dispersing in pure water, 1.5% by mass of hydrogen peroxide and 0.1% by mass of iron (III) nitrate were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition. Thus, the polishing composition of Comparative Example 1 did not contain a metal oxide having a half width of less than 1 ° as abrasive grains.
- Comparative Example 2 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. First, titanium oxide having a crystal structure of anatase structure, an X-ray half width of 2.1563 ° and an average particle diameter of 25 nm is dispersed in pure water so as to be 1.0% by mass, and then hydrogen peroxide 1 0.5% by mass and 0.1% by mass of iron (III) nitrate were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition. Thus, the polishing composition of Comparative Example 2 did not contain a metal oxide having a half width of less than 1 ° as abrasive grains.
- Example 3 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. First, zirconium oxide having a monoclinic crystal structure, an X-ray half width of 1.9254 °, and an average particle diameter of 22 nm is dispersed in pure water so as to be 1.0% by mass, and then is oxidized. Hydrogen 1.5 mass% and iron nitrate (III) 0.1 mass% were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition. Thus, the polishing composition of Comparative Example 3 did not contain a metal oxide having a half width of less than 1 ° as abrasive grains.
- Example 4 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition produced as follows was used. First, zirconium oxide having a monoclinic crystal structure, an X-ray half width of 1.1796 °, and an average particle diameter of 29 nm is dispersed in pure water so as to be 1.0% by weight, and then is oxidized. Hydrogen 1.5 wt% and iron (III) nitrate 0.1 wt% were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition. Thus, the polishing composition of Comparative Example 4 did not contain a metal oxide having a half width of less than 1 ° as abrasive grains.
- Example 5 Except for changing the polishing composition used, single-side polishing was performed on two types of semiconductor substrates under the same conditions as in Example 1, and the polishing rate, the amount of scratches generated, and the amount of dishing were evaluated in the same manner as in Example 1. did.
- the polishing composition manufactured as follows was used. First, ⁇ -aluminum oxide having a crystal structure of a trigonal structure, an X-ray half width of 2.6985 °, and an average particle diameter of 46 nm is dispersed in pure water so as to be 1.0 mass%, Hydrogen oxide 1.5 mass% and iron (III) nitrate 0.1 mass% were added and mixed. Thereafter, the pH of the solution was adjusted to 2.5 with nitric acid to produce a polishing composition. Thus, the polishing composition of Comparative Example 5 did not contain a metal oxide having a half width of less than 1 ° as abrasive grains.
- Table 1 shows a summary of polishing compositions and evaluation results of Examples and Comparative Examples.
- Example 1-4 As shown in Table 1, in Example 1-4, the polishing rate was higher and the dishing amount and the number of scratches were smaller than those in the comparative example. On the other hand, Comparative Example 1-4 had a lower polishing rate than the Examples, and the dishing amount and the number of scratches were significantly increased. In Comparative Example 5, although the polishing rate was almost the same as in Example 1, the dishing amount and the number of scratches were greatly increased.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
Abstract
Description
金属酸化物粒子の平均粒子径が10nm以上であれば極端に研磨速度が遅くなることがなく、また、平均粒子径が100nm以下であれば、スクラッチの発生を防ぐことができるものとなる。
本発明で用いられる金属酸化物としては、これらのようなものを含んだ金属酸化物粒子が好適である。
酸化剤を含むことで、半導体基板の表面を酸化でき、研磨を効果的に促進することができるものとなる。
金属酸化物粒子の含有量が0.1質量%以上であれば充分な研磨速度を得ることができ、金属酸化物粒子の含有量が10質量%以下であればスクラッチの発生を抑制することができるものとなる。
このような研磨組成物であれば、被研磨物や目的に応じた特性、pHを有するものとなる。
上記の研磨組成物を用いれば、高い研磨速度で半導体基板を研磨でき、且つスクラッチおよびディッシングの発生を抑制することができる。
本発明は、金属層を含んだ半導体基板の研磨に好適である。
本発明は、金属層としてタングステン又はタングステン合金を含んだ半導体基板の研磨に特に好適である。
上述のように、半導体素子の微細化が進むにつれ、CMP等の研磨におけるスクラッチやディッシング等の欠陥の低減要求が高まっている。そして、欠陥の低減と同時に、研磨速度の低下も抑制しなければならないという課題があった。
まず、本発明の研磨組成物について説明する。
本発明の研磨組成物は、粉末X線回折によって測定される回折強度のメインピークの半値幅が1°未満である高結晶性の金属酸化物を含有している。
また、複合酸化物は、酸化チタン、酸化ジルコニウム、酸化セリウム、酸化アルミニウム、酸化マンガンのうち少なくとも1つの金属酸化物を含有する複合酸化物であることが好適である。
この複合酸化物として、例えばジルコニア/セリア複合酸化物、アルミナ/セリア複合酸化物、ジルコニア/イットリア複合酸化物、鉄/マンガン複合酸化物が挙げられるが、これらに限定されることはない。
金属酸化物粒子の平均粒子径が10nm以上では研磨速度が極端に遅くならず、100nm以下であれば、粒子が大き過ぎないのでスクラッチが発生し難い。
そして、この酸化剤は特に限定されないが、過酸化物からなる有機又は無機化合物、或いは鉄(III)塩であることが好ましい。
金属酸化物の含有量が0.1質量%以上であれば充分な研磨速度を得ることができ、また10質量%以下の含有量であればスクラッチ等の欠陥が発生し難い。
分散剤として、例えば水溶性高分子を添加することができる。水溶性高分子の種類、構造、分子量は特に制限されず従来公知のものを目的に応じ適宜選択できる。また、水溶性高分子の例として、ポリカルボン酸、ポリスルホン酸、ポリアクリル酸、ポリビニルピロリドン、ポリアミン、ポリイミンなどが挙げられるが、これらに限定されるわけではない。
また、本発明における研磨組成物のpHは特に限定されず、被研磨物及び目的に応じ適宜選択できる。例えば、タングステン又はタングステン合金を含む半導体基板の表面を研磨する場合は、研磨組成物のpHが1以上、6以下であることが好ましい。
本発明において、高結晶性の金属酸化物粒子の製造方法は特に限定されず、目的に応じ適宜選択できる。
このような研磨装置10では、研磨ヘッド2で半導体基板Wを保持し、研磨組成物供給機構5から研磨パッド4上に本発明の研磨組成物1を供給するとともに、定盤3と研磨ヘッド2をそれぞれ回転させて半導体基板Wの表面を研磨パッド4に摺接させることにより研磨を行う。
本発明の研磨方法は被研磨物として金属層を含む表面の研磨に好適であり、特にタングステン、タングステン合金から成る金属層の研磨に対し好適に用いられる。
まず、本発明の研磨組成物を供給しながら、半導体基板の表面を片面研磨し、その後研磨速度及びスクラッチの発生量を評価した。
この片面研磨で使用した研磨組成物は、以下のように製造した。
最初に、結晶構造がアナターゼ構造であり、X線半値幅が0.4322°、平均粒子径が32nmである酸化チタンを、含有量が1.0質量%となるよう純水に分散させ、次に過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加し混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このとき、半値幅は(株)リガク製のRINT2500により、受光スリット幅0.3mm、管電圧50kV、管電流60mA、スキャンスピード3°/min、サンプリング幅0.024°の条件にて測定を行った。
また、研磨対象の半導体基板は、直径12インチ(300mm)のシリコン基板上に厚さ約10nmの窒化チタン層を介して約800nmのタングステン層を堆積したブランケット基板とした。
ρ=ρs×t …(式1)
(ここで、ρ:比抵抗(定数)、ρs:シート抵抗率、t:膜厚である。)
このとき使用した研磨組成物は、上記で製造した研磨組成物と同様のものであった。
研磨対象の半導体基板は、100nm間隔で幅100nm、深さ200nmの線状の溝に厚さ約1nmの窒化チタン層を介して厚さ約600nmのタングステン層を堆積し、溝部分を埋めたパターン付き基板とした。
ディッシングの発生量の評価は、研磨後のパターン部分を切り出し、断面を電子顕微鏡により観察し、溝のない非パターン領域とタングステン埋め込み部の最も窪んだ部分との差をディッシング量として評価した。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
最初に、結晶構造が単斜晶構造、X線半値幅が0.4169°、平均粒子径が35nmである酸化ジルコニウムを1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
最初に、結晶構造が三方晶構造、X線値幅が0.8469°、平均粒子径が58nmであるα-酸化アルミニウムを1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5重量%、硝酸鉄(III)0.1質量%を添加、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
最初に、結晶構造が単斜晶構造、X線半値幅が0.9108°、平均粒子径が33nmである酸化ジルコニウムを1.0重量%となるよう純水に分散させ、次に、過酸化水素1.5重量%、硝酸鉄(III)0.1重量%を添加、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
X線半値幅が5°以上あるブロードなピークを有するアモルファス(非晶質)構造で、平均粒子径が54nmであるコロイダルシリカを、研磨組成物中の含有量が1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このように、比較例1の研磨組成物は、砥粒として半値幅が1°未満の金属酸化物を含んでいないものとした。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
最初に、結晶構造がアナターゼ構造、X線半値幅が2.1563°、平均粒子径が25nmである酸化チタンを1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加し、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このように、比較例2の研磨組成物は、砥粒として半値幅が1°未満の金属酸化物を含んでいないものとした。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
最初に、結晶構造が単斜晶構造、X線半値幅が1.9254°、平均粒子径が22nmである酸化ジルコニウムを1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加し、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このように、比較例3の研磨組成物は、砥粒として半値幅が1°未満の金属酸化物を含んでいないものとした。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき以下のように製造した研磨組成物を使用した。
最初に、結晶構造が単斜晶構造、X線半値幅が1.1796°、平均粒子径が29nmである酸化ジルコニウムを1.0重量%となるよう純水に分散させ、次に、過酸化水素1.5重量%、硝酸鉄(III)0.1重量%を添加、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このように、比較例4の研磨組成物は、砥粒として半値幅が1°未満の金属酸化物を含んでいないものとした。
使用する研磨組成物を変えたこと以外、実施例1と同様な条件で2種類の半導体基板の片面研磨を行い、実施例1と同様な方法で研磨速度、スクラッチの発生量、ディッシング量を評価した。
このとき、以下のように製造した研磨組成物を使用した。
最初に、結晶構造が三方晶構造、X線半値幅が2.6985°、平均粒子径が46nmであるα-酸化アルミニウムを1.0質量%となるよう純水に分散させ、次に、過酸化水素1.5質量%、硝酸鉄(III)0.1質量%を添加し、混合した。その後、硝酸により溶液のpHを2.5に調整して研磨組成物を製造した。
このように、比較例5の研磨組成物は、砥粒として半値幅が1°未満の金属酸化物を含んでいないものとした。
一方で、比較例1-4は実施例に比べ研磨速度は小さく、更にディッシング量及びスクラッチの個数が大幅に増加してしまう結果となった。
比較例5では、実施例1と同程度で研磨速度は大きいものの、ディッシング量及びスクラッチの個数が大幅に増加してしまう結果となった。
Claims (13)
- 砥粒として結晶性の金属酸化物粒子を含む研磨組成物であって、
前記金属酸化物粒子が、粉末X線回折パターンにおける回折強度が最大となるピーク部分の半値幅が1°未満のものであることを特徴とする研磨組成物。 - 前記金属酸化物粒子の平均粒子径が10nm以上、100nm以下であることを特徴とする請求項1に記載の研磨組成物。
- 前記金属酸化物粒子は酸化チタン、酸化ジルコニウム、酸化セリウム、酸化アルミニウム、酸化マンガンのいずれか、あるいはこれらの中の少なくとも2個以上の混合物、又はこれらの金属酸化物のうち少なくとも1つを含有する複合酸化物を含むことを特徴とする請求項1又は請求項2に記載の研磨組成物。
- さらに酸化剤を含むことを特徴とする請求項1から請求項3のいずれか1項に記載の研磨組成物。
- 前記酸化剤として、過酸化物と鉄(III)塩のうち少なくとも1種類以上を含むことを特徴とする請求項4に記載の研磨組成物。
- 前記過酸化物として過硫酸、過ヨウ素酸、過塩素酸、これらの塩、及び過酸化水素からなる群より選ばれる少なくとも1種類以上を含むことを特徴とする請求項5に記載の研磨組成物。
- 前記鉄(III)塩として、硫酸鉄(III)、硝酸鉄(III)、塩化鉄(III)、シュウ酸鉄(III)、トリス(オキサラト)鉄(III)カリウム、ヘキサシアノ鉄(III)アンモニウム、ヘキサシアノ鉄(III)カリウム、クエン酸鉄(III)、クエン酸鉄(III)アンモニウム、水溶性フェロセン誘導体からなる群より選ばれる少なくとも1種類以上を含むことを特徴とする請求項5又は請求項6に記載の研磨組成物。
- 前記金属酸化物粒子の含有量が0.1質量%以上、10質量%以下であることを特徴とする請求項1から請求項7のいずれか1項に記載の研磨組成物。
- さらに、分散剤とpH調整剤のうち少なくとも1種類以上を含むことを特徴とする請求項1から請求項8のいずれか1項に記載の研磨組成物。
- 請求項1から請求項9のいずれか1項に記載の研磨組成物を用いて半導体基板を研磨することを特徴とする研磨方法。
- 前記半導体基板が金属層を含むことを特徴とする請求項10に記載の研磨方法。
- 前記金属層はタングステン又はタングステン合金であることを特徴とする請求項11に記載の研磨方法。
- 請求項1から請求項9のいずれか1項に記載の研磨組成物の製造方法であって、
粉末X線回折法によって、前記金属酸化物粒子の回折強度が最大となるピーク部分の半値幅を測定する工程と、
該測定した半値幅が1°未満である前記金属酸化物粒子を砥粒として前記研磨組成物に添加する工程を含むことを特徴とする研磨組成物の製造方法。
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TWI640612B (zh) | 2018-11-11 |
US20170096584A1 (en) | 2017-04-06 |
CN106103637B (zh) | 2018-01-30 |
JP2015168818A (ja) | 2015-09-28 |
JP6130316B2 (ja) | 2017-05-17 |
TW201546251A (zh) | 2015-12-16 |
US10017669B2 (en) | 2018-07-10 |
KR102339476B1 (ko) | 2021-12-15 |
CN106103637A (zh) | 2016-11-09 |
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