WO2008044477A1 - Dispersion aqueuse pour polissage chimico-mécanique et procédé de polissage chimico-mécanique pour dispositif semi-conducteur - Google Patents
Dispersion aqueuse pour polissage chimico-mécanique et procédé de polissage chimico-mécanique pour dispositif semi-conducteur Download PDFInfo
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- WO2008044477A1 WO2008044477A1 PCT/JP2007/068803 JP2007068803W WO2008044477A1 WO 2008044477 A1 WO2008044477 A1 WO 2008044477A1 JP 2007068803 W JP2007068803 W JP 2007068803W WO 2008044477 A1 WO2008044477 A1 WO 2008044477A1
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- WIPO (PCT)
- Prior art keywords
- chemical mechanical
- water
- mechanical polishing
- soluble polymer
- aqueous dispersion
- Prior art date
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- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 235000011835 quiches Nutrition 0.000 description 1
- GJAWHXHKYYXBSV-UHFFFAOYSA-N quinolinic acid Chemical compound OC(=O)C1=CC=CN=C1C(O)=O GJAWHXHKYYXBSV-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
-
- 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
-
- 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
- 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
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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 chemical mechanical polishing aqueous dispersion suitably used for manufacturing a semiconductor device, and a chemical mechanical polishing method using the chemical mechanical polishing aqueous dispersion.
- a technique called a damascene method As a technique that can achieve further miniaturization of the wiring, a technique called a damascene method is known. This method forms a desired wiring by embedding a wiring material in a groove or the like formed in an insulating layer and then using chemical mechanical polishing to remove excess wiring material deposited other than the groove. It is.
- tantalum, tantalum nitride, titanium nitride, etc. are usually provided at the interface between the copper or copper alloy and the insulator in order to avoid migration of copper atoms into the insulating layer.
- a high-strength, high-dielectric-constant insulating layer is formed.
- the first polishing step for example, polishes copper at 800 nm / min, does not substantially scrape the NORA layer, and reduces the copper depth to 20 nm or less. Control is required.
- a low dielectric constant material low-k material
- the polishing friction is large, the layer will peel off or the layer itself may be destroyed, so the conventional polishing friction is large! / Aqueous dispersion for chemical mechanical polishing The body is becoming difficult to apply.
- the second polishing step is polished with low friction to increase the hydrophilicity between the surface to be processed and the polishing cloth in the same manner as the first polishing step. Hope to reduce the upper scratch and improve copper erosion insulation erosion. It is rare.
- Japanese Patent Application Laid-Open No. 2003-282494 proposes an aqueous dispersion for chemical mechanical polishing comprising a polyoxoacid or a salt thereof, a water-soluble polymer, and water. It is described that such an aqueous dispersion for chemical mechanical polishing can suppress the occurrence of defects on the polished surface such as scratches and dishing.
- JP-A-2002-270549 describes that polybutylpyrrolidone can be added as a dispersant for abrasive grains contained in an aqueous dispersion for chemical mechanical polishing.
- JP 2002-517593 A proposes an aqueous dispersion for chemical mechanical polishing comprising water, abrasive grains, an oxidant, and an organic polymer. It is also described that the organic polymer can be polyvinyl pyrrolidone. Such chemical mechanical polishing aqueous dispersions are described as being capable of suppressing the polishing rate of abrasive grains.
- a force in which a water-soluble polymer such as polypyrrole pyrrolidone is added to the chemical mechanical polishing aqueous dispersion It is intended to adsorb water-soluble polymers on the surface to increase the dispersibility of the abrasive grains and to reduce the polishing rate of the surface to be polished.
- “fang” as used in this specification is a phenomenon that occurs particularly prominently when the metal layer also has copper or copper alloy strength, and includes a region containing fine wiring of copper or copper alloy, and copper Alternatively, it refers to a groove-like scratch that becomes a defect as a semiconductor device by chemical mechanical polishing at the interface with a region (field portion) that does not contain fine wiring of copper alloy.
- a chemical mechanical polishing water system is used at the interface between a region containing fine copper or copper alloy wiring and a region (field part) not containing copper or copper alloy fine wiring.
- One possible cause is that the components contained in the dispersion are unevenly localized and the vicinity of the interface is excessively polished.
- the abrasive grain component contained in the chemical mechanical polishing aqueous dispersion is present at a high concentration in the vicinity of the interface, the polishing rate at the interface increases locally, resulting in excessive polishing.
- polishing defect called “fang”.
- fangs There are various forms of fangs depending on the wiring pattern.
- the cause of the occurrence of fang will be specifically described by taking the workpiece 100 shown in FIGS. 1A to 1C as an example.
- the workpiece 100 includes an insulating layer 12 in which a wiring recess 20 such as a groove is formed on a base body 10, the surface of the insulating layer 12, and the bottom of the wiring recess 20 A barrier layer 14 provided so as to cover the inner wall surface, a wiring recess 20, and a layer 16 made of copper or a copper alloy formed on the barrier layer 14 are sequentially laminated.
- the object to be processed 100 includes a region 22 including fine wiring of copper or copper alloy and a region 24 not including fine wiring of copper or copper alloy. In the region 22 including fine wiring, a convex portion of copper or copper alloy is easily formed.
- FIG. 1B shows a stage in the middle of chemical mechanical polishing of the layer 16 made of copper or copper alloy.
- the layer 16 made of copper or copper alloy is subjected to chemical mechanical polishing, it does not include the copper or copper alloy fine wiring 22 and the copper or copper alloy fine wiring! /, At the interface between the region 24! /, As a result, fine scratches 30 may occur.
- FIG. 1C shows a state after further cutting the layer 16 made of copper or copper alloy and performing chemical mechanical polishing until the noria layer 14 appears on the surface. At this stage, the fine scratch 30 becomes a groove-like scratch fang 32! /.
- the NOR layer 14 is positively charged and the abrasive grains 28 are negatively charged, the abrasive grains 28 become minute scratches 30 due to electrostatic interaction. To be localized Become.
- chemical mechanical polishing is performed in a state where the abrasive grains 28 are localized on the fine scratches 30, the fine scratches 30 are excessively polished and the fangs 32 are generated.
- This fang may be a defect in a semiconductor device, which is not preferable from the viewpoint of reducing the yield of semiconductor device manufacturing.
- An object of the present invention is to uniformly form a layer made of copper or a copper alloy in which a copper residue is formed with low friction, while suppressing generation of the above-mentioned fang, which is achieved only by copper date and copper corrosion and insulation layer erosion. Moreover, it is an object to provide an aqueous dispersion for chemical mechanical polishing that can be stably polished.
- the chemical mechanical polishing aqueous dispersion according to the present invention comprises:
- the pH is 7 or more and 12 or less.
- the mass ratio of (A) the first water-soluble polymer and (B) the second water-soluble polymer ( A) / (B) can be a force S between 0.02 and 50.
- the viscosity of a 5% by mass aqueous solution of (A) the first water-soluble polymer is 50 to 150 mPa's. be able to.
- the viscosity of the (B) 5% by mass aqueous solution of the second water-soluble polymer is from! To 5 mPa's. be able to.
- the (A) first water-soluble polymer is a structural unit derived from a compound selected from bullpyridine, bullpyrrolidone, and bullimidazole. It can be a copolymer having at least one.
- the (B) second water-soluble polymer is acrylic acid, methacrylic acid, itaconic acid, maleic acid, styrene sulfonic acid.
- Arils It can be a copolymer having at least one structural unit derived from a compound selected from sulfonic acid, vinyl sulfonic acid, and salts thereof.
- the chemical mechanical polishing aqueous dispersion according to the present invention may further comprise (E) a complexing agent and (F) a surfactant.
- the chemical mechanical polishing method for a semiconductor device is a method for polishing a layer made of copper or a copper alloy on a semiconductor substrate using the chemical mechanical polishing aqueous dispersion.
- the aqueous dispersion for chemical mechanical polishing according to the present invention is (A) a first water-soluble polymer having a weight average molecular weight of 500,000 to 2,000,000 and having a heterocyclic ring in the molecule. And (B) a second water-soluble polymer having a weight average molecular weight of 1,000 to 10,000 and having one selected from a carboxyl group and a sulfo group, or a salt thereof.
- A a first water-soluble polymer having a weight average molecular weight of 500,000 to 2,000,000 and having a heterocyclic ring in the molecule.
- B a second water-soluble polymer having a weight average molecular weight of 1,000 to 10,000 and having one selected from a carboxyl group and a sulfo group, or a salt thereof.
- the first water-soluble polymer When the first water-soluble polymer is added to the chemical mechanical polishing aqueous dispersion, it is possible to suppress the generation of fangs caused only by copper desiccation, copper corrosion and insulating layer erosion. On the other hand, since the polishing speed of the surface to be polished becomes slow, further polishing time is required to obtain a desired surface to be polished. Further, since the polishing power of the chemical mechanical polishing aqueous dispersion is reduced, copper residue is likely to occur.
- the chemical mechanical polishing aqueous dispersion further suppresses the generation of copper dating, copper corrosion, insulation layer erosion, and fangs by adding a second water-soluble polymer or a salt thereof.
- a second water-soluble polymer or a salt thereof it is possible to recover the polishing rate that has been lowered by the addition of the first water-soluble polymer.
- the addition of the second water-soluble polymer can remove the copper residue caused by the decrease in the polishing power of the chemical mechanical polishing aqueous dispersion.
- the metal layer to be polished is a layer made of copper or a copper alloy
- the oxidizing agent contained in the chemical mechanical polishing aqueous dispersion is peroxidized. If it is hydrogen, it has been confirmed that fangs are more likely to occur! /!
- FIG. 1A is a cross-sectional view showing a mechanism of a fang generated during chemical mechanical polishing in the manufacture of a semiconductor device.
- FIG. 1B is a cross-sectional view showing a mechanism of a fang generated during chemical mechanical polishing in the manufacture of a semiconductor device.
- FIG. 1C is a cross-sectional view showing a mechanism of a fang generated during chemical mechanical polishing in the manufacture of a semiconductor device.
- FIG. 2 is a cross-sectional view of the semiconductor device before chemical mechanical polishing in the semiconductor device manufacturing method according to the present embodiment.
- FIG. 3 is a cross-sectional view of the semiconductor device after chemical mechanical polishing in the method for manufacturing a semiconductor device according to the present embodiment.
- FIG. 4 is a schematic view showing a part of a chemical mechanical polishing apparatus.
- the chemical mechanical polishing aqueous dispersion according to the present invention comprises (A) a first water-soluble polymer having a weight average molecular weight of 500,000 to 2,000,000 and having a heterocyclic ring in the molecule; B) a second water-soluble polymer or salt thereof having a weight average molecular weight of 1,000 to 10,000 and having one selected from a carboxyl group and a sulfo group, (C) an oxidizing agent, D) Abrasive grains and having a pH of 7 or more and 12 or less.
- the chemical mechanical polishing aqueous dispersion may contain (E) a complex-forming agent, (F) a surfactant, and other components as required, as long as the effects of the present invention are not impaired.
- the chemical mechanical polishing aqueous dispersion according to this embodiment has a weight average molecular weight of 500,000 to 2,000,000, and contains the first water-soluble polymer having a heterocyclic ring in the molecule. Copper date singing can suppress copper corrosion.
- the first water-soluble polymer has a heterocyclic ring in its molecule, so it has a relatively good affinity with copper.It reduces the polishing friction by adsorbing to the copper surface, and the copper wiring during polishing. The part can be protected effectively.
- the first water-soluble polymer also has the effect of increasing the viscosity of the chemical mechanical polishing aqueous dispersion moderately, resulting in the generation of non-uniformly shaped flaws called fangs that often occur at the ends of fine wiring sections. Can also be suppressed.
- a copolymer having at least one structural unit derived from a compound selected from bulupyridine, bulupyrrolidone, and bamidazole is used as a first water-soluble polymer that can be expected to have the above-mentioned effects. Can be mentioned.
- the first water-soluble polymer preferably has a weight average molecular weight in terms of sodium polystyrene sulfonate measured by gel permeation chromatography (solvent is water) of preferably from 500,000 to 2,000,000, more preferably 50 It can be from 10,000 to 1,500,000, particularly preferably from 700,000 to 1,500,000.
- solvent is water
- the weight average molecular weight is in the above range, it is possible to reduce polishing friction and to suppress copper corrosion.
- a layer made of copper or a copper alloy can be polished stably. If the weight average molecular weight is less than 500,000, a fan will generate a force.
- the weight average molecular weight is too large, a practical polishing rate may not be obtained, and copper residue tends to occur.
- the agglomeration of abrasive grains may occur in the slurry supply device, and the agglomerated abrasive grains may increase scratches on the copper.
- the amount of the first water-soluble polymer added is preferably 0.005 mass% or more and 1 mass% or less, more preferably 0.01 mass% or more of the mass of the chemical mechanical polishing aqueous dispersion. 5 mass
- % Or less particularly preferably 0.01% by mass or more and 0.2% by mass or less. If the amount of the first water-soluble polymer added is less than 0.005% by mass, polishing friction may not be reduced, and the temperature of the polishing cloth may increase. As a result, depending on the components of the slurry, a phenomenon that polishing is stopped (CMP stop) is likely to occur. In addition, the copper removing power in the copper overplating portion may be reduced. On the other hand, when the amount of addition of the water-soluble polymer of L; In addition, the viscosity of the chemical mechanical polishing aqueous dispersion may become too high to stably supply the slurry onto the polishing cloth.
- the viscosity of the chemical mechanical polishing aqueous dispersion is preferably less than 2 mPa ⁇ s! /.
- the chemical mechanical polishing aqueous dispersion according to the present embodiment is a chemical mechanical polishing (hereinafter, also referred to as a first polishing) in which a wiring metal such as copper or a copper alloy is exposed until the noble layer is exposed. ) It can be used suitably. If the amount of the first water-soluble polymer added is in the above range, it is possible to achieve a low friction and a high polishing speed in chemical mechanical polishing of a layer made of copper or a copper alloy. Since the polishing rate of the rear layer can be kept low, the ability to leave a barrier layer can be achieved. Also, copper dating and insulating layer erosion can be suppressed, and defects such as copper corrosion and scratches on copper can be reduced. Furthermore, the copper polishing power of the copper overplating part is improved, and the force S increases the stability of polishing and the uniformity of the polishing speed.
- a chemical mechanical polishing hereinafter, also referred to as a first polishing in which a wiring metal such as copper or a copper alloy is
- the first water-soluble polymer can be defined by the viscosity of a 5 mass% aqueous solution.
- the viscosity of a 5% by weight aqueous solution of the first water-soluble polymer measured at 25 ° C using a BM type rotary viscometer is preferably 50 to 150 mPa's, more preferably 50 to 120 mPa's Especially preferred is 60-; lOOmPa's.
- the viscosity of the 5% by mass aqueous solution of the first water-soluble polymer is in the above range, the frictional force during polishing can be reduced and the generation of fangs can be suppressed.
- the viscosity of a 5% by mass aqueous solution of the first water-soluble polymer is less than 50 mPa's, friction during polishing is not sufficiently reduced, and fangs may occur.
- the viscosity of the chemical mechanical polishing aqueous dispersion according to this embodiment is preferably less than 2 mPa ′s. Since the viscosity of the chemical mechanical polishing aqueous dispersion according to the present embodiment is substantially determined by the weight average molecular weight and the addition amount of the first water-soluble polymer, the viscosity is adjusted within the above range in consideration of the balance between them.
- the first water-soluble polymer may be used alone, but if the weight-average molecular weight of the first water-soluble polymer or the viscosity of a 5 mass% aqueous solution is in the above range. Also, two or more kinds of first water-soluble polymers having different weight average molecular weights can be used in combination.
- the addition of the first water-soluble polymer may cause a disadvantage that the polishing rate is reduced or copper residue is generated. Such inconvenience is caused by excessive protection of the surface to be polished by the first water-soluble polymer.
- Such a problem can be solved by adding a second water-soluble polymer.
- the weight-average molecular weight is 1,000 to 10,000, and the carboxyl group and sulfo group are used.
- the second water-soluble polymer or a salt thereof having one selected the above-mentioned first water-soluble polymer is suppressed while suppressing the occurrence of copper dating, copper corrosion, insulation layer erosion and fang. Problems due to the addition of molecules can be eliminated.
- the first water-soluble polymer is slightly positively charged, while the second water-soluble polymer is negatively charged.
- the second water-soluble polymer is negatively charged.
- first water-soluble polymer and the second water-soluble polymer have different charges, a network of the water-soluble polymer can be formed in the aqueous dispersion. While imparting an appropriate viscosity to the aqueous dispersion, it is possible to buffer the contact of the abrasive grains with the copper surface.
- the second water-soluble polymer that can be expected to have the above effects is selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, styrene sulfonic acid, allyl sulfonic acid, vinyl sulfonic acid, and salts thereof. Mention may be made of copolymers having at least one structural unit derived from a compound.
- the second water-soluble polymer has a weight average molecular weight of 1,000 to 1,000,000 in terms of sodium polystyrene sulfonate measured by gel permeation chromatography (solvent is water). it can.
- solvent is water
- the weight average molecular weight is within the above range, the polishing rate of the layer made of copper or copper alloy, which is lowered by the addition of the first water-soluble polymer, can be recovered.
- the weight average molecular weight is greater than 10,000, many scratches on the copper surface occur due to the interaction with the abrasive grains.
- the weight average molecular weight is smaller than 1,000, the polishing rate of the layer made of copper or copper alloy decreased by the addition of the first water-soluble polymer is adjusted. It may not be able to fully recover and copper residue tends to occur.
- the amount of the second water-soluble polymer added is preferably 0.005% by mass or more and 1% by mass or less, more preferably 0.01% by mass or more and 0.001% by mass or more of the mass of the chemical mechanical polishing aqueous dispersion. 5% by mass or less, particularly preferably 0.01% by mass or more and 0.2% by mass or less.
- the amount of the second water-soluble polymer added is less than 0.005% by mass, the polishing rate of the layer made of copper or copper alloy, which has been lowered by the addition of the first water-soluble polymer, should be sufficiently recovered. It may not be possible to generate copper residue.
- the amount of the second water-soluble polymer added exceeds 1% by mass, the function of the second water-soluble polymer becomes too large, and the erosion increases if the copper etching is performed.
- the chemical mechanical polishing aqueous dispersion according to this embodiment is used for the first polishing described above, if the addition amount of the second water-soluble polymer is in the above range, copper or copper In the chemical mechanical polishing of the alloy layer, a low friction and a high polishing rate can be achieved.
- the polishing rate of the NORA layer can be kept low, the NORA layer can be left.
- copper dating and insulating film erosion are suppressed, and defects such as copper corrosion and copper scratches can be reduced.
- the copper polishing power of the copper overplating portion is improved, and the polishing stability and the uniformity of the polishing rate can be improved.
- the second water-soluble polymer can be defined by the viscosity of a 5 mass% aqueous solution.
- the viscosity of a 5% by weight aqueous solution of the second water-soluble polymer measured using a BM type rotary viscometer is preferably 1 to 5 mPa's, more preferably 1 to 3 mPa's, and particularly preferably 1 to 2mPa • s.
- the viscosity of the 5% by mass aqueous solution of the second water-soluble polymer is in the above range, the etching to the copper wiring acts effectively and the copper residue can be eliminated.
- the (A) No. included in the chemical mechanical polishing aqueous dispersion is included in the chemical mechanical polishing aqueous dispersion.
- the mass ratio (A) / (B) between the water-soluble polymer of 1 and (B) the second water-soluble polymer can be defined.
- Force, force, mass it (A) / (B) (or preferably (or 0.02-50, more preferably (or 0.05 to 20; particularly preferably 0.; in the range of! To 10)
- the mass ratio is less than 0.02.
- friction during polishing is not sufficiently reduced, and fangs may occur.
- copper date singing can increase erosion of the insulating layer.
- the mass ratio is greater than 50, the recovery of the polishing force with respect to the increase in viscosity of the chemical mechanical polishing aqueous dispersion is not sufficient, and copper residue is likely to occur.
- the second water-soluble polymer may be used alone, but if the weight-average molecular weight of the second water-soluble polymer or the viscosity of a 5 mass% aqueous solution is in the above range. Two or more second water-soluble polymers having different weight average molecular weights may be used in combination.
- Examples of the oxidizing agent used in the chemical mechanical polishing aqueous dispersion according to this embodiment include ammonium persulfate, potassium persulfate, hydrogen peroxide, ferric nitrate, diammonium cerium nitrate, iron sulfate, ozone, and the like. Examples include potassium periodate. These oxidizing agents can be used alone or in combination of two or more.
- ammonium persulfate, potassium persulfate, and hydrogen peroxide are particularly preferred in view of oxidizing power, compatibility with the protective film, ease of handling, and the like.
- the addition amount of the oxidizing agent is preferably 0.03 to 5% by mass, more preferably 0.05 to 3% by mass, based on the mass of the chemical mechanical polishing aqueous dispersion.
- the polishing rate may decrease because the layer made of copper or copper alloy cannot be sufficiently oxidized.
- corrosion of the layer made of copper or copper alloy may increase copper dishing.
- inorganic particles or organic-inorganic composite particles are preferable.
- inorganic particles fumed silica, fumed alumina, fumed titania synthesized by reacting silicon chloride, aluminum chloride or titanium chloride with oxygen and hydrogen in the gas phase by fumed method; sol-gel method
- silica synthesized by hydrolytic condensation of metal alkoxides; high-purity colloidal silica synthesized by an inorganic colloid method and the like from which impurities have been removed by purification can be mentioned.
- the organic inorganic composite particles are not particularly limited in type, configuration, etc.
- the organic particles and the inorganic particles are integrally formed to such an extent that they are not easily separated during polishing.
- polymer particles such as polystyrene and polymethylmetatalylate, alkoxysilane, aluminum alkoxide, titanium alkoxide and the like are polycondensed, and at least the surface of the polymer particles has polysiloxane, polyanolenoxan, Examples thereof include composite particles in which a polycondensate such as polytitanoxane is formed.
- the formed polycondensate may be directly bonded to the functional group of the polymer particle! /, Or may be bonded via a silane coupling agent or the like! /.
- the organic-inorganic composite particles may be formed using the polymer particles, silica particles, alumina particles, titania particles, and the like.
- the composite particles may be formed such that silica particles or the like are present on the surface of the polymer particles by using a polycondensate such as polysiloxane, polyminoxane or polytitanoxane as a binder. It may be formed by chemically bonding a functional group such as a hydroxyl group having a functional group of the polymer particle.
- organic-inorganic composite particles use is made of composite particles in which organic particles and inorganic particles having different zeta potential signs are combined by electrostatic force in an aqueous dispersion containing these particles. You can also.
- the zeta potential of organic particles is often negative over the entire pH range or a wide pH range excluding a low pH range. In many cases, the organic particles have a negative zeta potential more reliably when they have a carboxyl group, a sulfonic acid group, or the like. If the organic particles have an amino group or the like, they may have a positive zeta potential in a specific pH range.
- the zeta potential of inorganic particles has an isoelectric point at which the zeta potential is highly dependent on pH, and the sign of the zeta potential is reversed before and after the pH depending on the pH.
- the organic particles and the inorganic particles are combined and integrated by electrostatic force.
- Composite particles can be formed.
- the pH is changed thereafter, and the zeta potential of one particle, especially inorganic particles, is reversed, thereby integrating the organic particles and the inorganic particles. It can also be converted.
- the composite particles integrated by electrostatic force are polycondensed with alkoxysilane, aluminum alkoxide, titanium alkoxide, etc. in the presence of the composite particles, so that polysiloxane, Polycondensates such as polyaluminoxane and polytitanoxane may be further formed.
- the average particle size of the abrasive grains is preferably 5 to 1000 nm. This average particle diameter can be measured by a laser scattering diffraction measuring instrument or by observation with a transmission electron microscope. If the average particle size is less than 5 nm, a chemical mechanical polishing aqueous dispersion having a sufficiently high polishing rate may not be obtained. If it exceeds lOOOnm, dating and erosion may be insufficiently controlled, and a stable aqueous dispersion may not be easily obtained due to sedimentation and separation of the abrasive grains.
- the average particle diameter of the abrasive grains may be within the above range, but is more preferably 10 to 700 nm, and particularly preferably 15 to 500 nm. When the average particle diameter is in this range, a stable chemical mechanical polishing aqueous dispersion can be obtained in which dating and erosion with a high polishing rate are sufficiently suppressed, and particle settling or separation is unlikely to occur. .
- metal ions such as iron, nickel, zinc and the like remain in a semiconductor device that has been subjected to chemical mechanical polishing, the yield is often lowered. Therefore, in the present invention, these metal ions are contained in the abrasive grains. Even in such a case, an abrasive having an amount of usually 1 Oppm or less, preferably 5 ppm or less, more preferably 3 ppm or less, particularly preferably 1 ppm or less is preferred. Needless to say, these metal ions are preferably not contained in the abrasive grains.
- the abrasive is preferably 0.0;! To 5 mass% of the mass of the chemical mechanical polishing aqueous dispersion, and more preferably 0.02 to 4 mass%. If the amount of abrasive grains is less than 0.01% by mass, a sufficient polishing rate may not be obtained. If the amount exceeds 5% by mass, the cost increases and a stable chemical mechanical polishing aqueous dispersion cannot be obtained. There is.
- Examples of the complexing agent used in the chemical mechanical polishing aqueous dispersion according to this embodiment include a complexing agent that forms a water-insoluble complex and a complexing agent that forms a water-soluble complex.
- the term “water-insoluble” as used herein means that it does not substantially dissolve in water. included.
- water-soluble includes that the wet etching rate is 3 nm / min or more.
- the complexing agent may be used alone or in combination of two or more of the complexing agent that forms a water-insoluble complex or the complexing agent that forms a water-soluble complex. Good.
- the amount of the complexing agent added is preferably 0.0005% by mass or more and 4.0% by mass or less, and more preferably 0.05% by mass or more 2% by mass of the chemical mechanical polishing aqueous dispersion. 0% by mass or less.
- the amount added is less than 0.0005% by mass, it is difficult to suppress copper dipping to 20 nm or less.
- the addition amount of the complexing agent exceeds 4.0% by mass, the polishing rate may decrease.
- Examples of the complexing agent that forms a complex insoluble or sparingly soluble in water with a metal such as copper include, for example, heterocyclic compounds containing at least one nitrogen atom and a hetero 6-membered ring or a hetero 5-membered ring. Can be mentioned. More specifically, quinaldic acid, quinolinic acid, benzotriazole, benzimidazole, 7-hydroxy-5-methyl-1,3,4-triazaindolizine, nicotinic acid, and picolinic acid can be exemplified.
- ayuonic surfactants can be used as a complex-forming agent that forms a water-insoluble complex.
- examples of preferred alkylbenzene sulfonates include potassium dodecylbenzenesulfonate and ammonium dodecylbenzenesulfonate.
- the amount of the complex-forming agent that forms a water-insoluble complex is preferably 0.0005% by mass or more and 2.0% by mass or less, more preferably 0.007% by mass or less of the mass of the chemical mechanical polishing aqueous dispersion. 5% by mass or more and 1.5% by mass or less. If the amount of the complexing agent that forms a water-insoluble complex is less than 0.0005% by mass, copper dipping may increase. On the other hand, if it exceeds 2.0 mass%, a sufficiently high copper polishing rate may not be obtained.
- the complex-forming agent that forms a water-soluble complex serves as a polishing accelerator, and examples thereof include the amino acids glycine, alanine, and tributophane. Also similar An organic acid having an action is also effective. For example, formic acid, lactic acid, acetic acid, tartaric acid, fumaric acid, glycolic acid, phthalic acid, maleic acid, oxalic acid, succinic acid, malic acid, malonic acid, and daltaric acid. Furthermore, basic salts such as ammonia, ethylenediamine, and TMAH (tetramethyl ammonium hydroxide) may be used.
- TMAH tetramethyl ammonium hydroxide
- the amount of the complex-forming agent that forms the water-soluble complex varies depending on the metal species S, preferably 0.0005 mass% or more and 2.0 mass% or less of the mass of the chemical mechanical polishing aqueous dispersion. More preferably, it is 0.0075% by mass or more and 1.5% by mass or less.
- the addition amount is less than 0.0005 mass%, copper cannot be polished at a sufficiently large rate. On the other hand, if it exceeds 2.0% by mass, copper dishing may cause significant corrosion of copper.
- a nonionic surfactant, an anionic surfactant, or a cationic surfactant is added to the chemical mechanical polishing aqueous dispersion of the chemical mechanical polishing aqueous dispersion according to this embodiment, as necessary. Can do.
- nonionic surfactant examples include a nonionic surfactant having a triple bond. Specific examples include acetylene glycol, its ethylene oxide adduct, and acetylene alcohol. Also, use silicone surfactants, polybulualcohol, cyclodextrin, polybulumethylether, and quiche chinechenoresenorelose.
- anionic surfactant examples include aliphatic salt, sulfate ester salt, phosphate ester salt and the like.
- Examples of the cationic surfactant include an aliphatic amine salt and an aliphatic ammonium salt.
- These surfactants can be used singly or in combination of two or more.
- the weight average molecular weight is smaller than that of the first water-soluble polymer! /
- nonionic surfactants are preferred! /.
- the amount of the surfactant added is preferably about 0. 0 of the mass of the chemical mechanical polishing aqueous dispersion. It is 001 mass% or more and 0.5 mass% or less, More preferably, it is 0.05 mass% or more and 0.3 mass% or less. When the added amount of the surfactant is within the above range, the force S can sufficiently control the copper dating.
- the chemical mechanical polishing aqueous dispersion according to the present embodiment may contain a pH adjuster, an anticorrosive, and the like as necessary.
- Examples of the pH adjuster include an organic base, an inorganic base, and an inorganic acid.
- Examples of the organic base include tetramethylammonium hydroxide and triethylamine.
- Examples of the inorganic base include ammonia, potassium hydroxide, sodium hydroxide, hydroxide power, magnesium hydroxide, and the like.
- Examples of the inorganic acid include nitric acid, sulfuric acid, hydrochloric acid, acetic acid and the like.
- the pH of the chemical mechanical polishing aqueous dispersion according to this embodiment is not particularly limited, and can be adjusted using the pH adjuster. According to the research by the inventors, it has been confirmed that the fang is more likely to occur in the alkali region! / Can be suitably used even in the alkaline region (pH 7 to 12).
- the addition amount of the pH adjusting agent is preferably 0.005% by mass or more and 5% by mass or less, more preferably 0.01% by mass with respect to the mass of the chemical mechanical polishing aqueous dispersion. Above 3.5 mass% or less.
- the anticorrosive examples include benzotriazole and its derivatives.
- the benzotriazole derivative means one obtained by substituting one or more hydrogen atoms of benzotriazole with, for example, a carboxyl group, a methyl group, an amino group, or a hydroxyl group.
- examples of the benzotriazole derivative include 4 carboxyl benzotriazole and a salt thereof, 7-carboxybenzotriazole and a salt thereof, benzotriazole butyl ester, 1-hydroxymethylbenzotriazole, and 1-hydroxybenzotriazole.
- the amount of the anticorrosive added is preferably 0.005% by mass or more and 0.1% by mass or less, more preferably 0.01% by mass or more, with respect to the mass of the chemical mechanical polishing aqueous dispersion. 0. 05 Less than mass%.
- FIG. 2 shows a workpiece 100 according to the chemical mechanical polishing method of the first specific example.
- FIG. 2 is the same as the object to be processed shown in FIG. 1A, but here will be described including the material of each layer.
- an insulating layer 12 made of silicon oxide is provided on a base 10 on which a semiconductor element (not shown) is formed, and the insulating layer 12 is etched to form a recess 20 for wiring.
- the insulating layer 12 can be composed of, for example, a PETEOS layer or an insulating layer having a relative dielectric constant of 3.5 or less, preferably an insulating layer having a relative dielectric constant of 3.5 or less, more preferably 3 An insulating layer of 0 or less.
- the object to be processed 100 is provided with a barrier layer 14 so as to cover the surface of the insulating layer 12 and the bottom and inner wall surface of the wiring recess 20.
- the NOR layer 14 can be formed of, for example, tantalum or tantalum nitride.
- the object to be processed 100 is formed by filling the recess 20 for wiring with copper or a copper alloy and laminating on the noor layer 14. Further, the object to be processed 100 includes a region 22 including fine wiring of copper or copper alloy and a region 24 not including fine wiring of copper or copper alloy. In the region 22 including the fine wiring, a convex portion of copper or copper alloy is easily formed! /.
- FIG. 3 shows a cross-sectional view of the workpiece 100 after the first polishing.
- the chemical mechanical polishing aqueous dispersion is used until the surface of the barrier layer 14 is exposed except for the portion of the layer 16 made of copper or copper alloy other than the portion buried in the wiring recess 20. Polish the machine.
- a chemical mechanical polishing apparatus as shown in FIG. 4 can be used.
- FIG. 4 shows a schematic diagram of a chemical mechanical polishing apparatus.
- the semiconductor substrate 50 is held while supplying the chemical mechanical polishing aqueous dispersion (slurry 44) from the slurry supply nozzle 42 and rotating the turntable 48 to which the polishing cloth 46 is attached. This is done by bringing the top ring 52 into contact.
- a water supply nozzle 54 and a dresser 56 are also shown.
- the polishing load of the top ring 52 can be selected within the range of 10 to 1,000 gf / cm 2 (0.98 to 98 kPa), preferably 30 to 500 gf / cm 2 (2.94 to 49kPa). Further, the rotation speed of the turntable 48 and the top ring 52 can be appropriately selected within the range of 10 to 400 rpm, and preferably 30 to 150 rpm. The flow rate of the slurry 44 supplied from the slurry supply nozzle 42 can be selected within the range of 10 to 1,000 cm 3 / min, preferably 50 to 400 cm 3 / min.
- the first polishing described above has excellent flatness with no copper residue, while suppressing the generation of fang caused by copper corrosion and insulation erosion alone, as shown in FIG. A semiconductor device can be obtained.
- Ion exchange water in a plastic container 0.2 mass% of colloidal silica (manufactured by Fuso Chemical Co., Ltd., primary particle diameter 30 nm) as abrasive grains, 0.2 mass% and 0.2 mass% of quinaldic acid and glycine as complexing agents, respectively. 3 weight 0/0, potassium dodecylbenzenesulfonate 0.1 mass% as a surfactant, an amount equivalent to 0.1 wt% hydrogen peroxide as oxidizing agent, and the first, second water-soluble high The amounts corresponding to Examples 1 to 9 described in Table 1 as molecules were added.
- a wafer with a pattern (manufactured by SEMATECH INTERNATIONAL, open $ “SEMAT ECH 854”) was used as an object to be polished.
- Chemical mechanical polishing was performed under the conditions described in “3.2.1 Polishing conditions”, and copper residue, dating, erosion, fang and scratch were evaluated as follows.
- the quantity (dateing) was measured using a precision step gauge (manufactured by KLA-Tencor Corporation, model “H RP-240”). These results are shown in Table 2. Generally, it can be judged that the date is good if it is 50 nm or less.
- the pattern force S in which the copper wiring part with a width of 9 m and the insulating part with a width of 1 ⁇ m continue alternately, and the amount of dents against both ends of the central part of the wiring group for the part with a continuous length of 1.25 mm John) was measured using a precision step gauge (manufactured by KLA-Tencor Corporation, model “HRP-240”). These values are Re and the results are shown in Table 2. In general, erosion can be determined to be good if it is 50 nm or less.
- Pattern force in which copper wiring part with width of 9 m and insulation part with width of 1 ⁇ m are alternately connected was measured using a model “HRP-240” manufactured by KLA-Tencor Corporation. These values were designated as Rf, ⁇ when it was below the value of Rf 3 ⁇ 4e, and X when it was above. Table 2 shows the results.
- Comparative Examples 1 to 7 are examples containing polybulurpyrrolidone as the first water-soluble polymer and polyacrylic acid as the second water-soluble polymer.
- Comparative Examples 1 and 2 are examples in which the weight average molecular weight of the first water-soluble polymer is too small.
- Comparative Examples 3 and 4 are examples in which the weight average molecular weight of the first water-soluble polymer is too large.
- Comparative Example 5 is an example in which the weight average molecular weight of the first water-soluble polymer is too small.
- Comparative Example 6 is an example in which the weight average molecular weight of the second water-soluble polymer is too small.
- Comparative Examples 7 and 8 are examples in which the weight average molecular weight of the second water-soluble polymer is too large.
- Comparative Example 9 is an example in which polybulal alcohol having no heterocyclic ring is used as the first water-soluble polymer.
- Comparative Example 10 is an example in which an acrylamide′dimethylaminoethylacrylamide copolymer having no heterocyclic ring is used as the first water-soluble polymer.
- Comparative Example 11 is an example not containing the second water-soluble polymer.
- Comparative Example 12 is an example not containing the first water-soluble polymer.
- Comparative Example 13 includes hydroxyethyl cellulose as the first water-soluble polymer, polymethacrylic acid as the second water-soluble polymer, and the weight average molecular weight of the second water-soluble polymer is large. This is an example too.
- Comparative Example 14 is an example including polyphosphoric acid as the second water-soluble polymer and not including the first water-soluble polymer.
- Comparative Example 15 is an example not containing any water-soluble polymer.
- Comparative Example 16 is an example in which the pH of the chemical mechanical polishing aqueous dispersion is 5.2.
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JP2008509855A JP4143872B2 (ja) | 2006-10-06 | 2007-09-27 | 化学機械研磨用水系分散体および半導体装置の化学機械研磨方法 |
US12/297,949 US8574330B2 (en) | 2006-10-06 | 2007-09-27 | Chemical mechanical polishing aqueous dispersion and chemical mechanical polishing method for semiconductor device |
KR1020097002947A KR101406487B1 (ko) | 2006-10-06 | 2007-09-27 | 화학 기계 연마용 수계 분산체 및 반도체 장치의 화학 기계연마 방법 |
EP07828549A EP2071615B1 (en) | 2006-10-06 | 2007-09-27 | Aqueous dispersion for chemical mechanical polishing and chemical mechanical polishing method for semiconductor device |
US14/027,500 US20140011360A1 (en) | 2006-10-06 | 2013-09-16 | Chemical mechanical polishing aqueous dispersion and chemical mechanical polishing method for semiconductor device |
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- 2007-09-27 WO PCT/JP2007/068803 patent/WO2008044477A1/ja active Application Filing
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- 2007-09-27 CN CNA2007800264309A patent/CN101490814A/zh active Pending
- 2007-09-27 EP EP07828549A patent/EP2071615B1/en not_active Not-in-force
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JP2010017841A (ja) * | 2008-06-11 | 2010-01-28 | Shin-Etsu Chemical Co Ltd | 合成石英ガラス基板用研磨剤 |
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JP2010034509A (ja) * | 2008-07-03 | 2010-02-12 | Fujimi Inc | 半導体用濡れ剤、それを用いた研磨用組成物および研磨方法 |
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JP2010135792A (ja) * | 2008-12-03 | 2010-06-17 | Lg Chem Ltd | 1次化学的機械的研磨用スラリー組成物および化学的機械的研磨方法 |
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JP2014082237A (ja) * | 2012-10-12 | 2014-05-08 | Fujimi Inc | 研磨用組成物の製造方法及び研磨用組成物 |
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US9126766B2 (en) | 2013-05-10 | 2015-09-08 | Renesas Electronics Corporation | Manufacturing method of semiconductor device, and semiconductor device |
WO2018150945A1 (ja) * | 2017-02-20 | 2018-08-23 | 株式会社フジミインコーポレーテッド | シリコン基板中間研磨用組成物およびシリコン基板研磨用組成物セット |
JP2018199751A (ja) * | 2017-05-25 | 2018-12-20 | ニッタ・ハース株式会社 | 研磨用スラリー |
Also Published As
Publication number | Publication date |
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KR20090059109A (ko) | 2009-06-10 |
TW200833825A (en) | 2008-08-16 |
TWI410480B (zh) | 2013-10-01 |
EP2071615A1 (en) | 2009-06-17 |
US8574330B2 (en) | 2013-11-05 |
EP2071615B1 (en) | 2012-07-18 |
EP2071615A4 (en) | 2010-12-08 |
CN101490814A (zh) | 2009-07-22 |
US20140011360A1 (en) | 2014-01-09 |
JPWO2008044477A1 (ja) | 2010-02-04 |
JP4143872B2 (ja) | 2008-09-03 |
US20090221213A1 (en) | 2009-09-03 |
KR101406487B1 (ko) | 2014-06-12 |
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