WO2005101474A1 - 金属用研磨液及びこれを用いた研磨方法 - Google Patents
金属用研磨液及びこれを用いた研磨方法 Download PDFInfo
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- WO2005101474A1 WO2005101474A1 PCT/JP2005/007065 JP2005007065W WO2005101474A1 WO 2005101474 A1 WO2005101474 A1 WO 2005101474A1 JP 2005007065 W JP2005007065 W JP 2005007065W WO 2005101474 A1 WO2005101474 A1 WO 2005101474A1
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- Prior art keywords
- polishing
- metal
- polished
- abrasive particles
- surface potential
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Classifications
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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
- H01L21/31—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]
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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
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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
Definitions
- the present invention relates to a metal polishing liquid and a polishing method using the same.
- LSI semiconductor integrated circuit
- CMP chemical mechanical polishing
- a general method of metal CMP is to attach a polishing pad to a circular polishing platen (platen), soak the polishing pad surface with a metal polishing solution, and press the surface of the substrate on which the metal film is formed. Then, while applying a predetermined pressure (hereinafter, referred to as a polishing pressure) from the back surface, the polishing platen is turned, and the metal film on the convex portion is formed by mechanical friction between the polishing liquid and the convex portion of the metal film. It is removed.
- a polishing pressure hereinafter, referred to as a polishing pressure
- the metal polishing liquid used for CMP generally has an oxidizing agent and abrasive particle power, and a metal oxide dissolving agent, a protective film forming agent, and the like are further added as necessary. It is considered that the basic mechanism is to first oxidize the surface of the metal film by oxidizing, and to scrape off the oxidizing layer with abrasive particles. The oxide layer on the metal surface of the concave portion does not touch the polishing pad much, and the effect of shaving by the abrasive particles does not reach. Therefore, as the CMP proceeds, the metal layer on the convex portion is removed, and the substrate surface becomes flat.
- an aminoacetic acid such as glycine or an amide-sulfuric acid dissolving agent which also has amide sulfuric acid power and BTA
- a polishing liquid for metals containing a protective film forming agent such as (benzotriazole) has been proposed (for example, see Japanese Patent Application Laid-Open No. 8-83780).
- the solution of poor flatness due to the effect of forming a protective film such as BTA may undesirably reduce not only the dating and erosion but also the polishing rate in some cases.
- removal of the abrasive particles adhered to the substrate can be achieved by adding a surfactant to the cleaning solution or changing the pH of the cleaning solution to make the potential of the polishing particles and the substrate the same sign to improve the cleaning effect.
- a method has been proposed for increasing the level (see, for example, Japanese Patent Application Laid-Open No. H8-107094).
- the addition of the above-mentioned surfactant may cause a problem that the surfactant itself adheres to the substrate and becomes a source of contamination, and further, depending on the combination with the polishing liquid used, the effect may not be exhibited.
- the surfactant itself adheres to the substrate and becomes a source of contamination, and further, depending on the combination with the polishing liquid used, the effect may not be exhibited.
- the present invention provides a metal polishing liquid that enables high planarization at a high Cu polishing rate, and a polishing method using the same.
- the present invention provides a metal polishing slurry and a polishing method using the same, which enable reduction of polishing particles remaining on the substrate surface after polishing.
- the present invention is (1) a metal polishing slurry containing abrasive particles and a chemical component,
- the present invention relates to a metal polishing liquid contained therein.
- the present invention is (2) a metal polishing slurry containing abrasive particles
- the present invention relates to a metal polishing liquid having the same sign as the surface potential charge of the abrasive particles and the surface potential charge of the metal to be polished to be polished by the metal polishing liquid.
- the present invention also provides (3) the product of (1) wherein the product of the surface potential (mV) of the reaction layer or the adsorption layer or a mixed layer thereof and the surface potential (mV) of the abrasive particles is 1 to: LOOOO. Metal polishing liquid.
- the present invention also relates to (4) the metal polishing slurry of (2), wherein the product of the surface potential (mV) of the metal to be polished and the surface potential (mV) of the abrasive particles is 1 to: LOOOO.
- the present invention also relates to (5) the polishing slurry for a metal according to any one of (1) to (4), wherein the primary particle size of the polishing particles is 200 nm or less.
- the present invention also relates to (6) the polishing slurry for metals described in (1) to (5) above, wherein the abrasive particles are associated and the associated secondary particle size is 200 nm or less.
- the present invention also relates to (7) the metal polishing slurry according to any one of (1) to (6), wherein the compounding amount of the abrasive particles is 0.001 to: L0% by mass. Further, the present invention relates to (8) the polishing liquid for metals described in (1) to (7) V, wherein the abrasive particles are at least one of colloidal silica and colloidal silica.
- the present invention also relates to (9) the polishing slurry for a metal according to any one of the above (1) to (8), wherein the pH of the polishing slurry for a metal is 2.0 to 7.0.
- the present invention provides (10) at least one metal selected from the group consisting of copper, copper alloy, copper oxide, and copper alloy oxide, wherein the metal to be polished by the metal polishing liquid is a polishing object.
- the above (1) to (9) V which relates to any of the above, is a polishing liquid for metal.
- the present invention provides (11) a method of forming a substrate having a film to be polished on a polishing cloth while supplying the metal polishing slurry of any of the above (1) to (10) onto the polishing cloth of the polishing platen.
- the present invention relates to a polishing method for polishing a film to be polished by relatively moving a polishing platen and a substrate in a pressed state.
- the metal polishing slurry and the polishing method using the same according to the present invention enable high flattening at a high Cu polishing rate.
- the metal polishing slurry of the present invention and the polishing method using the same enable reduction of abrasive particles remaining on the polished surface after polishing.
- FIG. 1 shows polishing rates (left axis, solid line) and dishing (right axis, dotted line), R * A (metal to be polished and polishing) of Example 2 and Comparative Example 1.
- Surface potential of each particle mV
- 6 is a graph showing a relationship between the product of the parentheses) and the product of parentheses.
- One aspect of the metal polishing liquid of the present invention is a metal polishing liquid containing abrasive particles and a chemical component
- the chemical component in the metal polishing liquid of the present invention is a component that causes the metal to be polished to form a reaction layer, an adsorption layer, or a mixed layer thereof.
- Constituents other than the abrasive particles acting in two ways namely, a metal oxide dissolving agent, Refers to foods, oxidants, and other additives.
- a reaction layer formed by a chemical component refers to a layer in which a chemical component is bonded to a metal to be polished by a covalent bond, a coordination bond, an ionic bond, or the like.
- the adsorption layer refers to a layer in which a chemical component is adsorbed to a metal to be polished by physical adsorption such as hydrogen bonding, van der Waals force, and electrostatic attraction.
- the surface potential refers to a ⁇ potential measured by a ⁇ potential measurement device. The surface potential of the metal to be polished!
- the surface potential of the reaction layer, the adsorption layer, or the mixed layer thereof refers to the oxide powder fine particles of the metal to be polished added to the metal polishing solution without adding abrasive particles.
- the metal to be polished is Cu
- copper oxide ( ⁇ ) powder is added to a metal polishing solution containing no abrasive particles, the mixture is allowed to stand, the supernatant is collected, and the ⁇ potential of the copper oxide is measured.
- the surface potential of the abrasive particles refers to a ⁇ potential obtained by measuring the abrasive particles in a polishing slurry for metal.
- another aspect of the metal polishing slurry of the present invention is a metal polishing slurry containing abrasive particles.
- the charge of the surface potential of the polished metal has the same sign.
- the surface potential of a metal to be polished refers to a ⁇ potential obtained by measuring fine particles of an oxide of a metal to be polished added to a polishing liquid for metal to which no abrasive particles are added.
- the metal to be polished to be polished by the metal-polishing liquid is preferably at least one selected from the group consisting of copper, copper alloys, copper oxides and copper alloys.
- Other examples include tantalum, titanium, tungsten, and compounds thereof.
- abrasive particles examples include silica, alumina, titer, cerium oxide and the like, and are preferably colloidal silica and silica or colloidal silicas. Further, the above-mentioned abrasive particles may be used by adding a trace amount of metal species or performing surface modification to adjust the potential. There is no particular limitation on the method. The abrasive particles may be appropriately selected depending on the surface potential of a commercially available material measured and the choice of the metal to be polished.
- the colloidal silica refers to colloidal silica based on the addition of a small amount of metal species during the sol-gel reaction, or the chemical modification of the surface silanol group, etc., and the method is not particularly limited. Absent. [0021] ⁇
- the surface potential (mV) of the reaction layer or adsorption layer of the metal to be polished formed by the chemical components contained in the polishing liquid for metal determined by the potential measuring device or the mixed layer thereof and the surface potential of the abrasive particles (The product with mV) (hereinafter referred to as R * A) is preferably from 1 to: ⁇ , ⁇ , preferably from 100 to: ⁇ , ⁇ , more preferably from 250 to 10,000. Like! / ,.
- the force S is preferably 1 to 100,000, more preferably 100 to 10,000, more preferably 250 to 10,000.
- CMP is considered to form a reaction layer composed of the chemical component and the metal to be polished by the action of the chemical component on the surface of the metal to be polished, and to perform polishing by modifying the surface to be more brittle and soft.
- the contact between the brittle and soft reaction layer and the abrasive particles is suppressed.However, in order to obtain a good polishing rate and to stabilize the polishing rate distribution in the substrate surface, the polishing particles are preferably used. Addition is considered desirable.
- abrasive particles having the same potential as the reaction layer or the adsorption layer formed on the metal to be polished or the mixed layer thereof contact between the reaction layer and the abrasive particles can be suppressed by electrostatic repulsion, and polishing can be performed. It is considered that both a good polishing rate by adding the particles and a stable polishing rate distribution in the substrate surface can be achieved.
- the residual abrasive particles on the substrate to be polished after the CMP process are generated by electrostatic repulsion. It is thought to be suppressed.
- the primary particle diameter of the abrasive particles is preferably 200 nm or less, more preferably 5 to 200 nm, particularly preferably 5 to 150 nm 5 to: LOOnm. That power S is very favorable. When the primary particle size exceeds 200 nm, the flatness tends to deteriorate.
- the secondary particle size is preferably 200 nm or less, more preferably 10 to 200 nm, and particularly preferably 10 to 150 nm. It is very preferred that it is ⁇ 100 nm. If the secondary particle size exceeds 200 nm, the flatness tends to be poor. When selecting a secondary particle size of less than lOnm, Care must be taken because the mechanical removal capability of the reaction layer due to this may become insufficient and the CMP rate may decrease.
- the primary particle size of the abrasive particles in the present invention is measured using a transmission electron microscope (for example, S4700 manufactured by Hitachi, Ltd.).
- the secondary particle size is measured using a light diffraction scattering type particle size distribution meter (eg, COULTER N4SD manufactured by COULTER Electronics).
- the amount of the metal-polishing liquid of the abrasive particles 0. 001:. It is L0 mass% good preferred, from 0.01 to 2 preferably than that force is 0 mass 0/0 , 0. 02 to: it is particularly preferred L is 0 mass 0/0. If the amount is less than 0.001% by mass, the mechanical reaction layer removing ability by the abrasive particles is insufficient, and the CMP rate tends to be low. If the amount exceeds 10% by mass, the flatness tends to be deteriorated.
- the amounts of the respective chemical components and abrasive particles are the percentages by mass based on the metal polishing liquid when using CMP.
- the power pH expected to exhibit the improvement of flatness and the improvement of cleaning properties in the entire pH range of the polishing slurry for metals is 2.0 to 7.0. More preferably, the preferred pH is between 3.0 and 5.0.
- the oxidizing agent for the metal to be polished in the present invention includes hydrogen peroxide (H 2 O 2), nitric acid, and periodic acid.
- Potassium citrate, ammonium persulfate, hypochlorous acid, ozone water and the like can be mentioned.
- hydrogen peroxide is particularly preferable.
- the substrate is a silicon substrate including an integrated circuit element, an alkali metal, an alkaline earth metal, or the like can be used. These can be used alone or in combination of two or more. However, since contamination by halogenated objects is not desirable, an oxidizing agent containing no nonvolatile component is desirable. Among them, hydrogen peroxide is preferred because of its stability.
- the metal oxide dissolving agent is preferably at least one selected from the group consisting of organic acids, organic acid esters, ammonium salts of organic acids and sulfuric acid, which are desirably water-soluble.
- organic acids organic acid esters, ammonium salts of organic acids and sulfuric acid, which are desirably water-soluble.
- Formic acid acetic acid, propionic acid, butyric acid, valeric acid, 2-methylbutyric acid, n-hexanoic acid, 3,3-dimethylbutyric acid, 2-ethylbutyric acid, 4-methylpentanoic acid, n-heptanoic acid, 2-methylhexanoic acid, n-octane Acid, 2-ethylhexanoic acid, benzoic acid, glycolic acid, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid ,
- Examples thereof include aluminum, ammonium nitrate, and salted ammonium, chromic acid and the like, and mixtures thereof.
- malic acid, tartaric acid, and citric acid are preferable because they can effectively suppress the etching rate while maintaining a practical CMP rate. These can be used alone or in combination of two or more.
- ammonia dimethylamine, trimethylamine, triethylamine, propylenediamine, ethylenediaminetetraacetic acid (EDTA), sodium getyldithiocarnomate and Ammonia such as chitosan, alkylamine, dithizone, mouth-in (2,2'-biquinoline), neocuproin (2,9-dimethyl-1,10-phenanthone-mouthed phosphorus), bathocuproin (2,9-dimethinolee 4,7 diphen-one) 1 , 10-phenanthroline) and cuperazone (biscyclohexanoneoxalylhydrazone); benzimidazole-2-thiol, triazinedithiol, triazinetrithiol, 2- [2- (benzothiazolyl)] thiopropion Acid, 2- [2- (benzothiazolyl)] thiobutyric acid
- the basic structure is a monomer having a carboxyl group such as polyacrylic acid, polyacrylic acid ammonium salt, polyacrylic acid sodium salt, polymethacrylic acid, polymethacrylic acid ammonium salt, polymethacrylic acid sodium salt and polyacrylamide.
- the group also includes a polymer having a monomer having a vinyl group as a basic structural unit, such as a polymer having a constitutional unit and a salt thereof, polybutyl alcohol, and polybutylpyrrolidone.
- the substrate to be applied is a silicon substrate for a semiconductor integrated circuit or the like
- an acid or an ammonium salt thereof is preferable because contamination by an alkali metal, an alkaline earth metal, a halide, or the like is not desirable.
- water-soluble polymers By adding these water-soluble polymers, a high polishing rate and good dating can be obtained.
- the substrate having the film to be polished is pressed against the polishing cloth while the polishing liquid for metal is supplied onto the polishing cloth of the polishing table.
- This is a polishing method for polishing the film to be polished by relatively moving.
- a polishing apparatus for example, a general polishing apparatus having a platen to which a polishing cloth (pad) is attached and a motor or the like whose rotation speed can be changed is mounted and a holder for holding a substrate is used. It can.
- the polishing cloth is not particularly limited, but a general nonwoven cloth, foamed polyurethane, porous fluororesin, or the like can be used.
- the polishing conditions are not particularly limited. It is preferable to set the rotation speed of the platen to a low rotation of 200 rpm or less so that the substrate does not pop out.
- the polishing pressure of the substrate having the film to be polished on the polishing cloth is preferably 5 to: LOOkPa, and 10 to 50 kPa from the viewpoint of the uniformity of the polishing rate within the wafer surface and the flatness of the pattern. Is more preferred.
- a polishing liquid for metal is continuously supplied to the polishing cloth by a pump or the like. Although there is no limit on the supply amount, the surface of the polishing pad is always ground. Preferably, it is covered with a polishing liquid.
- the semiconductor substrate is preferably washed well in running water, and then dried by force using a spin dryer or the like to remove water droplets attached to the substrate.
- the film to be polished is preferably at least one selected from the group consisting of copper, copper alloys, copper oxides, and oxides of copper alloys, like the metal to be polished.
- Other examples include tantalum, titanium, tungsten, and compounds thereof.
- the metal polishing slurry and the polishing method of the present invention can be applied to, for example, an LSI manufacturing process.
- a wiring material such as a copper alloy thin film on a substrate is polished to form a wiring. It can be buried. It can also be used for polishing substrates such as magnetic heads.
- the metal polishing slurry 1 used was composed of 1% by mass or less of an organic acid (metal oxide dissolving agent), 0.5% by mass or less of a nitrogen-containing cyclic compound (metal anticorrosive), and 2% by mass or less of a water-soluble compound. Contains molecules (additives), less than 10% by weight of hydrogen peroxide (oxidants), and water.
- the abrasive particles described in Table 1 having a primary particle size falling within the range of the average value shown in Table 1 ⁇ 10%, a secondary particle size falling within the range of the average value shown in Table 1 ⁇ 15%, and having different surface potentials were used.
- Carol was added to the metal polishing liquid 1.
- the substrate to be polished was subjected to CMP under the following polishing conditions by using the metal polishing liquid 1 containing abrasive particles having different surface potentials.
- the metal polishing slurry 2 used was 0.5% by mass or less of a metal oxide dissolving agent, 0.3% by mass or less of a nitrogen-containing cyclic compound (metal anticorrosive), and 0.5% by mass or less of a water-soluble compound. Contains molecules (additives), less than 10% by weight of hydrogen peroxide (oxidant), and water.
- the primary particle size is 10% of the average value described in Table 1
- the secondary particle size is within the range of ⁇ 15% of the average value described in Table 1
- CMP was performed under the following polishing conditions using the metal polishing liquid 2 to which polishing particles having different surface potentials were added.
- the metal polishing liquid 3 used was 1% by mass or less of an organic acid (metal oxide dissolving agent), 2% by mass or less of a water-soluble polymer (additive), and 10% by mass or less of hydrogen peroxide (oxidizing agent). ) And water. Further, abrasive particles having a primary particle size falling within the range of the average value shown in Table 1 ⁇ 10% and a secondary particle size falling within the range of the average value shown in Table 1 ⁇ 15% and having different surface potentials were used for the metal. It was added to polishing liquid 3.
- an organic acid metal oxide dissolving agent
- additive water-soluble polymer
- hydrogen peroxide oxidizing agent
- Example 6 and Comparative Example 3 a substrate to be polished was subjected to CMP under the following polishing conditions using the metal polishing liquid 3 to which the polishing particles shown in Table 1 having different surface potentials were added.
- the surface potential of a reaction layer, an adsorption layer, or a mixed layer formed on a metal to be polished by a chemical component (hereinafter, also referred to as the zeta potential of the metal to be polished), and the surface of abrasive particles in a polishing liquid.
- the electric potential was measured by the following ⁇ electric potential measuring device using a laser Doppler method as a measuring principle.
- the measurement of the zeta potential of the metal to be polished was Cu by polishing 1% by mass of copper (II) oxide powder (manufactured by Kanto Iridaku Co., Ltd.) in a metal polishing solution containing no abrasive particles.
- the mixture was left to stand for 5 minutes, and the supernatant was collected with a pipette, and 5 ml of the supernatant was injected into a measurement cell using a syringe to measure the zeta potential of the copper oxide.
- the surface potential of the abrasive particles (hereinafter, also referred to as the zeta potential of the abrasive particles) was measured with the metal polishing slurry contained at the compounding amount shown in Table 1.
- the primary particle diameter of the abrasive particles used in the present invention is determined by using a transmission electron microscope (S4700 manufactured by Hitachi, Ltd.) by drying the polishing liquid so that no aggregation occurs on the micromesh. It was measured at 0-500,000 times.
- the secondary particles of the abrasive particles have an intensity (equivalent to scattering intensity and turbidity) of 5E + 04 ⁇ at a measurement temperature of 20 ° C using a light diffraction scattering type particle size distribution meter (COULTER N4SD manufactured by COULTER Electronics). It was adjusted to the range of 4E + 05. If the strength was too strong, it was diluted with pure water, measured five times, and the average value of the Unimodal value was determined.
- the measurement was performed at a solvent refractive index of 1.333 (water), a particle refractive index setting of unknown, a solvent viscosity of 1.005 cp (water), a Run Time of 200 sec, and a laser incident angle of 90 °.
- a 25-nm TaN film and a 10-nm Cu film were formed by sputtering on an insulating layer with a pattern formed by grooves with a depth of 500 nm on the surface of the substrate, which also had a silicon force, and then an electrolytic plating method was used.
- a substrate to be polished (SEMATECH 854 wafer) on which 2 m of Cu was deposited was used. The Cu polishing rate was determined from the initial film thickness of the substrate to be polished and the polishing time.
- Polishing pad IC 1400 (manufactured by Mouth Dale)
- the substrate was washed with a PVA brush and ultrasonic water, and then dried with a spin dryer.
- Cu polishing rate The difference in film thickness of the copper film before and after CMP was determined by converting the electrical resistance value into a value.
- Dating The dishing was evaluated by scanning the wiring width of 100 m and the wiring space width of 100 m with a contact step meter (DECKTAK V200-Si manufactured by Veeco).
- Number of residual particles The number of residual abrasive particles on the polishing substrate was measured using Surfscan 6220 manufactured by KL-Tencor Corporation.
- polishing flaws The presence or absence of polishing flaws was confirmed by visual inspection, optical microscope observation, and electron microscope observation of the substrate after CMP. As a result, no polishing scratches were found.
- Example 1 shows almost the same Cu polishing rate as Comparative Example 1 in which abrasive particles having almost the same abrasive particle diameter and having the same surface potential as the metal to be polished were added. On the other hand, it can be seen that dicing is greatly reduced.
- Example 2 is obtained by adding particles having the same abrasive particle diameter as Example 1 and a surface potential of the abrasive particles larger than that of Example 1. It can be seen that the dicing is improved as compared with Example 1.
- titanium particles were selected as abrasive particles. It can be seen that the dating is good regardless of the type of abrasive particles.
- Example 4 As shown in Example 4, when the primary particle size and the secondary particle size of the abrasive particles are large, attention must be paid to the fact that dating tends to deteriorate. It can be seen from Example 5 and Comparative Example 2 that the effect is exhibited independently of pH.
- Example 6 is the same as Examples 1 to 5, except that the chemical component, the metal corrosion inhibitor, was eliminated. Although no metal anticorrosive is included, the polishing rate and the dicing are increased, but it can be seen that the dicing is improved as compared with Comparative Example 3 having the same chemical components as in Example 6.
- FIG. 1 shows a graph in which the polishing rate and the dating of Example 2 and Comparative Example 1 are plotted in relation to R * A.
- the abrasive particles having the sign of the negative surface potential are used, but when the sign of the surface potential of the metal to be polished is positive, It is considered that the effects of the present invention can be obtained by using abrasive particles having a positive surface potential sign.
- the metal polishing slurry and the polishing method using the same according to the present invention enable high flattening at a high Cu polishing rate.
- the metal polishing slurry of the present invention and the polishing method using the same enable reduction of abrasive particles remaining on the polished surface after polishing.
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Abstract
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Priority Applications (3)
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JP2006512335A JP4775260B2 (ja) | 2004-04-12 | 2005-04-12 | 金属用研磨液及びこれを用いた研磨方法 |
KR1020097006407A KR101049324B1 (ko) | 2004-04-12 | 2005-04-12 | 금속용 연마액 및 이것을 이용한 연마방법 |
US11/578,181 US20070196975A1 (en) | 2004-04-12 | 2005-04-12 | Metal-Polishing Liquid And Polishing Method Using The Same |
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JP2004116694 | 2004-04-12 | ||
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JP2004354585 | 2004-12-07 | ||
JP2004-354585 | 2004-12-07 |
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JP (2) | JP4775260B2 (ja) |
KR (3) | KR101049324B1 (ja) |
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WO (1) | WO2005101474A1 (ja) |
Cited By (9)
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JP2008280229A (ja) * | 2007-04-13 | 2008-11-20 | Hitachi Chem Co Ltd | 表面修飾二酸化ケイ素粒子の製造法及び研磨液 |
WO2008151918A1 (en) * | 2007-06-12 | 2008-12-18 | Basf Se | A process for polishing patterned and unstructured surfaces of materials and an aqueous polishing agent to be used in the said process |
WO2009119178A1 (ja) * | 2008-03-24 | 2009-10-01 | 株式会社Adeka | 表面改質コロイダルシリカおよびこれを含有するcmp用研磨組成物 |
JP2011505694A (ja) * | 2007-11-27 | 2011-02-24 | キャボット マイクロエレクトロニクス コーポレイション | 銅を不動態化するcmp組成物及び方法 |
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Also Published As
Publication number | Publication date |
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KR101049324B1 (ko) | 2011-07-13 |
US20070196975A1 (en) | 2007-08-23 |
TWI276171B (en) | 2007-03-11 |
TW200537615A (en) | 2005-11-16 |
KR20080022235A (ko) | 2008-03-10 |
KR20110055713A (ko) | 2011-05-25 |
JPWO2005101474A1 (ja) | 2007-08-16 |
JP2010074196A (ja) | 2010-04-02 |
JP4775260B2 (ja) | 2011-09-21 |
JP5176077B2 (ja) | 2013-04-03 |
KR20090038038A (ko) | 2009-04-17 |
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