WO2004107429A1 - 研磨剤及び研磨方法 - Google Patents
研磨剤及び研磨方法 Download PDFInfo
- Publication number
- WO2004107429A1 WO2004107429A1 PCT/JP2004/007746 JP2004007746W WO2004107429A1 WO 2004107429 A1 WO2004107429 A1 WO 2004107429A1 JP 2004007746 W JP2004007746 W JP 2004007746W WO 2004107429 A1 WO2004107429 A1 WO 2004107429A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- group
- abrasive
- polished
- substrate
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- 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
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
-
- 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
-
- 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
Definitions
- the present invention is used for a chemical mechanical polishing used in a semiconductor element manufacturing technique and used in a step of flattening a substrate surface, in particular, a step of flattening an interlayer insulating film, a step of forming a shallow wrench element separation, and the like.
- the present invention relates to an abrasive and a polishing method using the abrasive. Background art
- CMP chemical mechanical polishing
- fumes have been used as chemical-mechanical polishing agents to planarize inorganic insulating film layers such as silicon oxide insulating films formed by methods such as plasma-CVD and low-pressure CVD.
- a series of abrasives is generally considered. Fumed silica-based abrasives are manufactured by growing grains by pyrolysis of silicic acid tetrachloride and adjusting the pH. However, such an abrasive has a technical problem that the polishing rate is low.
- the single-wrench separation is used for the separation of the child in the integrated circuit.
- Shaguchi •
- CMP is used for removal, and a stopper film with a low polishing rate is formed under the silicon oxide film to stop polishing.
- Silicon nitride is used for the stop V film, It is desirable that the polishing rate ratio between the silicon oxide film and the stopper film be large.
- the conventional polishing agent based on a colloidal force has a small polishing rate ratio of about 3 between the silicon oxide film and the stopper film, and has properties that can be practically used for separating shallow wrench. I didn't.
- cerium oxide abrasives have been used as abrasives for glass surfaces such as photomask lenses.
- Cerium oxide particles have a lower hardness than silicon particles and alumina particles, and are therefore less likely to scratch the polished surface, and are therefore useful for finishing mirror polishing.
- the polishing rate is higher than that of a silica polishing agent.
- CMP abrasives for semiconductors using high-purity ceramic oxide abrasive grains have been used. For example, the technique is disclosed in Japanese Patent Application Laid-Open No. 10-169694.
- an abrasive having a ratio of the polishing rate of the silicon oxide insulating film to the polishing rate of the silicon nitride insulating film of 10 or more is required. Disclosure of the invention
- the particles form a chemical reaction layer with the film to be polished, and are polished at high speed without polishing scratches by mechanical action of very small particles and mechanical removal of the polishing pad.
- An object of the present invention is to provide an abrasive and a polishing method capable of performing the polishing.
- the present invention provides a ratio of the polishing rate of the silicon oxide insulating film to the polishing rate of the silicon nitride insulating film of 10 or more by adding the additive, which is suitable for the separation between the scalloped and trench elements. It is intended to provide an effective abrasive and a polishing method.
- the present invention relates to the following (1) to (12).
- R i represents hydrogen, methyl group, phenyl group, benzyl group, chloro group, difluoromethyl group, trifluoromethyl group, or cyano group
- R 2 and R 3 are each independently Hydrogen or CC 18 Indicates an alkyl chain, a methylol group, an acetyl group, or a diacetonyl group, and does not include the case where both are hydrogen.
- An abrasive that is a polymer containing at least one monomer component selected from the group of bodies.
- the polymer comprises an N-mono-substituted skeleton of acrylamide, an N-mono-substituted skeleton of metaacrylamide, an N, N-di-substituted skeleton of acrylamide, and a polymer.
- the tetravalent metal hydroxide is a rare earth metal hydroxide and hydroxylated
- At least the surface to be polished of the substrate on which the silicon oxide film is formed is pressed against the polishing pad and pressurized, and the polishing agent according to any one of (1) to (9) is applied to the polishing pad.
- FIG.1A to FIG.1C are schematic diagrams of a CMP test wafer evaluation unit for a narrow element isolation (STI) insulating film in an embodiment of the present invention.
- STI narrow element isolation
- FIG.1A is a plan view after forming a wrench
- FIG. 1B is a longitudinal sectional view of the AIG ′ plane of FIG. 1A
- FIG. 1C is a longitudinal sectional view after the insulating layer is embedded.
- FIG. 2 is a graph showing the relationship between the remaining amount of the concave insulating film and the polishing time in the example of the present invention, and a partially enlarged view of FIG. 1C showing each film thickness before polishing.
- FIG. 3 is a graph showing the relationship between the residual amount of the convex insulating film and the polishing time in the embodiment of the present invention, and FIG. 1 showing each film thickness before polishing. 2004/007746
- FIG. 4 is a graph showing the relationship between the remaining amount of the concave insulating film and the polishing time in the example of the present invention, and a partially enlarged view of FIG. 1C showing each film thickness before polishing.
- FIG. 5 is a graph showing the relationship between the remaining amount of the convex insulating film and the polishing time in the example of the present invention, and a partially enlarged view of FIG. 1C showing each film thickness before polishing. .
- SiN Silicon nitride
- the abrasive of the present invention contains slurries in which tetravalent metal hydroxide particles are dispersed in a medium and an additive.
- the specific area of the metal hydroxide particles is preferably 100 m 2 Zg or more. It is preferable that the median diameter of the two-partition particles of the above particles is 300 nm or less.
- At least one of the rare earth metal hydroxide and the zinc hydroxide is used as the metal hydroxide on the four surfaces. Water can be used as a medium.
- the metal hydroxide can be obtained, for example, by mixing a tetravalent metal salt with Alka U.
- a predetermined substrate such as a semiconductor substrate having a silicon film formed thereon can be polished with the polishing slurry of the present invention.
- a method for producing a metal hydroxide a method of mixing a tetravalent metal salt and an alkali solution can be used. This method is described in, for example, "Science of Rare Earth” (edited by Ginya Adachi, Kagaku Dojin, Inc., 19 4007746
- a tetravalent metal salts for example M (SO 4) 2, M (NH 4) 2 (NO 3) have M (NH 4) 4 (S 0 4) 4 ( although, M represents a rare earth element. ), Z r (SO 4) 2 ⁇ 4 ⁇ 2 ⁇ are preferred.
- chemically active Ce is more preferred.
- Ammonia water, potassium hydroxide, and sodium hydroxide can be used as the alkaline liquid. Ammonia water is preferred.
- the particulate tetravalent metal hydroxide synthesized by the above method can be washed to remove metal impurities.
- a method of repeating solid-liquid separation several times by centrifugation or the like can be used.
- the tetravalent metal hydroxide it is preferable to use at least one of a rare earth metal hydroxide and zirconium hydroxide. Two or more selected from rare earth metal hydroxides and zirconium hydroxide may be used. As the rare earth metal hydroxide, cerium hydroxide is more preferable.
- a slurry can be produced by dispersing the tetravalent metal hydroxide particles obtained by washing as described above in a liquid medium.
- the method of dispersing the metal hydroxide particles in a medium includes a homogenizer and a super-stand, in addition to the usual dispersion treatment using a stirrer.
- a wave disperser or a pole mill can be used.
- the abrasive of the present invention can be obtained by adding an additive to the slurry U.
- an additive there is no particular limitation on the method of adding the additive. Even if the additive is added in advance to the medium before dispersion, it is mixed at the same time as the dispersion treatment. Or may be added after dispersion.
- the additive in the present invention is a polymer containing at least one kind of monomer component selected from the group of monomers represented by the following general formulas (I) and (II). 7746
- R 2 and R 3 are each independently hydrogen or an alkyl chain of CCC18, a methylol group, an acetyl group, Indicates a diacetonyl group, and does not include when both are hydrogen.
- R 4 represents a morpholino group, a thiomorpholino group, a pyrrolidinyl group, or piperidino.
- the additive is preferably water-soluble. Further, it is preferably a molecular compound.
- the polymer may be a copolymer containing a monomer component other than the monomers represented by the general formulas (I) and (II).
- Monomer components such as vinyl alcohol, vinyl acetate, acrylic acid, methacrylic acid, acrylic acid ester, methyl acrylate, acrylonitrile, and maleic acid , Itaconic acid, bieramine, vinylpyridine, arylamine, bierpyrrolidone, vinylcaprol 4007746
- the polymer used as an additive is at least a monomer represented by the above general formula (I) or (II), and is obtained by a generally known polymerization method such as radical polymerization. can get.
- Examples of the monomers represented by the general formulas (I) and (II) in the present invention include the following compounds.
- the polymer used as the additive preferably has a monosubstituted N-monosubstituted or N, N-disubstituted skeleton of acrylamide. More preferably, the N-monosubstituted skeleton of acrylamide, the N-monosubstituted skeleton of methylacrylamide, the N, N-disubstituted skeleton of acrylamide and the meta-acrylamide It has at least one of the N, N-disubstituted skeletons. More preferably, a polymer of N, N-dimethylacrylamide, that is, poly (N, N-dimethyl acrylate) is used. 6
- the slurry of the present invention may be a slurry to which the above additives have been added, but a pH stabilizer, a dispersant, a surface treatment agent to be polished, etc. may be added as needed. . These addition methods are also appropriately selected depending on the composition.
- Carboxylates, phosphates, borates, and amine salts can be used as the PH stabilizer of the abrasive.
- the pH stabilizer is preferably used in such a manner that at least one component has a pKa value within 1.0 unit of the abrasive pH.
- ethylenediamine, pyridine, 2-aminopyridin, 3-aminopyridin, xanthosine, tolidine, picolinic acid, histidine, Perazine, 1-methylpyrazine, 2-bis (2-hydroxyl) amino 2- (hydroxymethyl) _1,3-propanediol, uric acid, and salts thereof are preferably used.
- the additive amount of the present invention is preferably in the range of 0.001 to 10 parts by weight based on 100 parts by weight of the abrasive.
- the range is more preferably from 0.01 part by weight to 1 part by weight. If the addition amount is too small, it is difficult to obtain high flattening characteristics, and if it is too large, the fluidity may decrease due to high viscosity.
- the weight average molecular weight of the additive is preferably from 500 to 5,000, 0000, more preferably from 1,000 to 1,000, 0000.
- the molecular weight of the additive is less than 50,000, it is difficult to obtain high flattening characteristics.
- the molecular weight of the additive exceeds 50,000, the viscosity becomes high. This is because the storage stability of the abrasive tends to decrease. JP2004 / 007746
- the abrasive of the present invention may contain another water-soluble polymer.
- Tetravalent metal hydroxide particles in the polishing agent made it to this, the specific surface area of 1 0 0 m 2 Roh g or more in which the child rather preferred,
- the average particle size of secondary particles Is preferably not more than 300 nm.
- the particle size of the particles in the abrasive is measured by a photon correlation method (for example, model number: Cole Yuichi N4SD).
- the specific surface area of the particles can be measured by the BET method.
- Particles need to have a chemical effect on the film to be polished, and have a specific surface area. If it is smaller than 100 m 2 Z g, the contact area with the film to be polished becomes small, and the polishing rate tends to decrease. If the median secondary particle size in the abrasive is larger than 300 nm, the contact area with the film to be polished also becomes small, and the polishing rate tends to decrease.
- the pH of the abrasive is preferably 3 or more and 9 or less, more preferably 4 or more and 7 or less, and particularly preferably 5 or more and 6 or less.
- the pH is lower than 3, the chemical acting force is reduced, while when the pH is higher than 9, the secondary particle diameter is increased, and in all cases, the polishing rate tends to decrease.
- T-trifluorofurfuryl alcohol diethylene glycol, methylen glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol Monomethyl ether, tetraethylenedalicol, dipropylene pyrendalcol, zippered pyrendalicol monomethyl ether, dipropylene pyrene U-cholesterol monoester, tripropylene glycol monomethyl ether, polyethylene glycol, 2-methyl glycol Ethers such as toxyl acetate, 2-ethoxyethyl acetate, diethylene glycol monoethyl acetate;
- Ketones such as acetone, methylethylketon, acetylaceton, cyclohexanone, etc. are mentioned. Among them, water, methanol, ethanol, 2-propanol, 2-propanol, Water is more preferred because it is more preferred to use hydrafluorofuran, ethylene glycol, acetate, and methylethylketone, and high polishing rate can be obtained.
- the amount of the medium is not particularly limited, but is preferably from 1,000 to: L, 000, 000 parts by weight based on 100 parts by weight of the particles, and 100,000 parts by weight. ⁇ 100,000 parts by weight are more preferred.
- Examples of a method for producing an inorganic insulating film polished by applying the polishing agent and the polishing method of the present invention include a low-pressure CVD method and a plasma CVD method.
- I Ri obtained and this to perform the S i H 4 10 2-based oxidation reaction 4 0 0 C about the following low temperature.
- Plasma CVD has the advantage that under normal thermal equilibrium, chemical reactions that require high temperatures can be performed at low temperatures.
- ⁇ S - ⁇ 2 based gas - o substrate temperature may be mentioned C ⁇ 2 5 0 ° 4 0 0 ° C, the reaction pressure is arbitrarily favored in the range of 6 7 ⁇ 4 0 0 P a .
- the silicon oxide insulating film of the present invention may be doped with elements such as phosphorus and boron.
- a silicon nitride film formed by low pressure CVD method, S i source and to Axis Rorushira emissions S i H 2 C 1 2 , ammonia as a nitrogen source: the use NH 3, the S i H 2 C 1 2 - NH 3 based oxide reacting 9 0 0. It can be obtained by performing at high temperature of C.
- S i H 4 with NH 3 as the S i H 4 nitrogen source as the S i sources - include NH 3 containing gas.
- the substrate temperature is preferably from 300 to 400 ° C.
- the polishing method of the present invention is characterized in that a predetermined substrate is polished with the above-mentioned polishing slurry of the present invention.
- a substrate in the process of manufacturing a semiconductor element is preferably used. More specifically, a substrate having a silicon oxide film or a silicon oxide film and a silicon nitride film formed on a semiconductor substrate is used at a stage where a circuit element and a wiring pattern are formed, a stage where a circuit element is formed, and the like. it can.
- a substrate having a silicon oxide film or a silicon oxide film and a silicon nitride film formed on a semiconductor substrate is used at a stage where a circuit element and a wiring pattern are formed, a stage where a circuit element is formed, and the like. it can.
- the silicon oxide film layer is polished to the lower silicon nitride film layer while eliminating the unevenness of the silicon oxide film layer, so that only the silicon oxide film embedded in the element isolation portion remains. You. At this time, if the ratio between the polishing rate of silicon oxide and the polishing rate of silicon nitride as a stopper is large, the polishing process margin becomes large.
- the additive when the above polymer is added as an additive to the abrasive, the additive is selectively adsorbed on the silicon nitride film in the neutral pH range, and more effectively serves as a stopper film. It works and makes process management easier.
- polishing method of the present invention will be described for the case of polishing a substrate on which a silicon oxide film is formed, but the present invention is not limited to this.
- a substrate on which at least a silicon oxide film is formed is prepared.
- the surface to be polished of the substrate is pressed against the polishing pad and pressurized, and the polishing agent of the present invention is supplied between the polishing pad and the surface to be polished while the surface to be polished and the polishing pad are moved relative to each other. Then, the substrate can be polished.
- a polishing device As a polishing device, a general polishing machine that can attach a polishing pad (polishing cloth) and has a polishing table on which a motor or the like whose rotation speed can be changed is mounted, and a holder that holds the substrate Polishing equipment can be used.
- polishing cloth general non-woven fabric, foamed polyurethane, porous fluororesin, etc. can be used, and there is no particular limitation. Further, it is preferable that the polishing cloth is subjected to groove processing so that the polishing agent is accumulated.
- the polishing conditions are not limited, but the rotation speed of the polishing platen is preferably as low as 100 rpm or less so that the substrate does not pop out.
- Pressing pressure to the polishing cloth substrate having a film to be polished is 1 0 k P a ⁇ l 0 0 k P a ( about 1 0 0-1 0 0 0 (111 2) a is a this is rather preferred, abrasive the order to satisfy the flatness of the wafer surface uniformity and pattern of speed, and a 2 is 0 k P a ⁇ 5 0 k P a ( about 2 0 0 ⁇ 5 0 0 gi Z cm 2) this While polishing, use a polishing cloth 6
- the supply amount of the polishing agent is continuously supplied between the surfaces to be polished by a pump or the like, but there is no limitation. However, it is preferable that the surface of the polishing cloth is always covered with the polishing agent.
- the holder may be rotated or rocked for polishing. Further, a polishing method in which a polishing platen is rotated in a planetary manner, a polishing method in which a belt-shaped polishing pad is linearly moved in one direction in a longitudinal direction, and the like are exemplified.
- the holder may be fixed, rotating, or swinging.
- polishing is performed with the surface condition of the polishing pad always being the same.
- polishing pad conditioning step before polishing the substrate by CMP.
- polishing is performed with a liquid containing at least water using a dresser with diamond particles.
- a polishing step according to the present invention is performed, and further,
- the abrasive of the present invention can be used for finish polishing by utilizing the feature that the surface to be polished can be polished without being damaged.
- the first-stage polishing is performed using ordinary silica slurry, serial slurry, or the like, and then the final polishing is performed using the polishing agent of the present invention, so that the shear-wrench separation can be performed.
- polishing can be performed at high speed while suppressing the occurrence of polishing scratches.
- the semiconductor substrate is thoroughly washed in running water, and then water drops adhering to the semiconductor substrate are wiped off using a spin driver or the like. 6
- polishing by a polishing method eliminates irregularities on the surface of the insulating film and makes the surface smooth over the entire surface of the semiconductor substrate. By repeating this process a predetermined number of times, a desired number of semiconductor layers can be manufactured.
- the polishing agent of the present invention is not limited to a silicon oxide film formed on a semiconductor substrate and a silicon nitride film, but also an inorganic insulating film such as a silicon oxide film formed on a wiring board having predetermined wiring, glass, silicon nitride, or the like.
- the obtained cerium hydroxide was subjected to solid-liquid separation by centrifugation (40000 rpm, 5 minutes). The liquid was removed, pure water was newly added, and the mixture was centrifuged again under the above conditions. Such an operation was repeated four times to perform washing.
- the specific surface area of the obtained particles measured by the BET method was 200 m 2 Zg.
- FIGS. 1A to 1C show schematic diagrams of evaluation wafers used in the examples of the present invention. That is, as shown in the plan view of FIG. 1A and the longitudinal sectional view of FIG. 1B, a silicon (Si) -based A silicon nitride (SiN) film 2 having a thickness of 100 nm was formed on a plate 1, and a trench 3 was further formed. Next, as shown in FIG. 1C in a longitudinal sectional view, a narrow element isolation (STI) insulating film CMP test for embedding the trench 3 with a silicon oxide (Si 2 ) insulating film 4 is performed. Jehachi was created.
- STI narrow element isolation
- the initial thickness of the insulating film 4 was 610 nm in the convex portion and 650 nm in the concave portion.
- the depth of the French 3 was 460 nm.
- the distance between the 100-im square silicon nitride film portion and the adjacent portion was 59 Hm.
- the test wafer for evaluation was set on the holder of the polishing device model EPO-111 manufactured by EBARA CORPORATION on which the suction pad for mounting the substrate to be held was attached.
- a polishing pad IC-1000 (perforate) made of a porous urethane resin manufactured by Kuchiwa Dale was attached to a polishing plate of 0 O mm.
- the holder was placed on the polishing pad with the insulating film 4 face down, and the processing load was set to 30 kPa.
- the cerium hydroxide abrasive prepared above was dropped on the polishing platen at a rate of 200 mL / min, the polishing platen and the wafer were operated at 5 O rpm, respectively, for 3 and 4.
- the STI insulating film CMP test wafer was polished for 5, 6, 7 and 9 minutes, respectively. The polished wafer was thoroughly washed with pure water and then dried.
- the convex portion was completely removed from the insulating film in 6 minutes, exposing the SiN film. After 6 minutes, no change was observed in the residual SiN film thickness, and it was found that polishing had hardly progressed. It was found that even after excessive polishing for more than 6 minutes, no excessive removal of the unevenness was observed.
- the remaining step with a polishing time of 6 minutes was 2 nm, and the remaining step was 10 nm even after excessive polishing for 1 minute, indicating that high flatness was achieved.
- a convex portion is polished FIG-. That by the oxidation cell re um abrasive as shown in 5 1 0 0 sec (broken line in the drawing portion), S i O 2 MakuzanmakuAtsu 1 0
- the remaining level difference after a total polishing time of 150 seconds was 3 nm, indicating that high flatness was achieved.
- cerium oxide abrasive 2 kg of cerium carbonate hydrate was calcined at 400 ° C. to obtain sevoxide.
- Cerium oxide and pure water were mixed and pulverized and dispersed by a bead mill. Thereafter, the mixture was filtered through a 1 m membrane filter to obtain a cerium oxide abrasive.
- the specific surface area of the particles is 150 m
- the median value of 2 / g and secondary particles was 200 nm.
- a test wafer for narrow element isolation (STI) insulating film CMP evaluation was polished in the same manner as in Example 1 except that the above-prepared cerium oxide abrasive was used. As a result, when polished for more than 3 minutes, the insulating film in the concave portion and the SiN film in the convex portion were all removed.
- STI narrow element isolation
- a polishing agent for CMP having good dispersion of tetravalent metal hydroxide particles, and a substrate having irregularities are polished.
- a polishing method capable of obtaining global flatness can be obtained.
- a surface to be polished such as a SiO 2 insulating film can be polished at high speed without being damaged, and a method for manufacturing a semiconductor device with high processing accuracy of the surface to be polished can be provided.
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- Condensed Matter Physics & Semiconductors (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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Description
Claims
Priority Applications (2)
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US10/558,406 US8075800B2 (en) | 2003-05-28 | 2004-05-28 | Polishing slurry and polishing method |
JP2005506567A JP4285480B2 (ja) | 2003-05-28 | 2004-05-28 | 研磨剤及び研磨方法 |
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JP2003-150319 | 2003-05-28 | ||
JP2003150319 | 2003-05-28 |
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JP (1) | JP4285480B2 (ja) |
KR (1) | KR100698396B1 (ja) |
CN (1) | CN100373556C (ja) |
TW (1) | TWI278507B (ja) |
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US8728341B2 (en) | 2009-10-22 | 2014-05-20 | Hitachi Chemical Company, Ltd. | Polishing agent, concentrated one-pack type polishing agent, two-pack type polishing agent and method for polishing substrate |
WO2011048889A1 (ja) * | 2009-10-22 | 2011-04-28 | 日立化成工業株式会社 | 研磨剤、濃縮1液式研磨剤、2液式研磨剤及び基板の研磨方法 |
JP2015067773A (ja) * | 2013-09-30 | 2015-04-13 | 株式会社フジミインコーポレーテッド | 研磨用組成物およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1795543A (zh) | 2006-06-28 |
KR20060013422A (ko) | 2006-02-09 |
TW200513519A (en) | 2005-04-16 |
KR100698396B1 (ko) | 2007-03-23 |
JPWO2004107429A1 (ja) | 2006-07-20 |
JP4285480B2 (ja) | 2009-06-24 |
US20060289826A1 (en) | 2006-12-28 |
TWI278507B (en) | 2007-04-11 |
CN100373556C (zh) | 2008-03-05 |
US8075800B2 (en) | 2011-12-13 |
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