WO2014119301A1 - 表面選択性研磨組成物 - Google Patents
表面選択性研磨組成物 Download PDFInfo
- Publication number
- WO2014119301A1 WO2014119301A1 PCT/JP2014/000461 JP2014000461W WO2014119301A1 WO 2014119301 A1 WO2014119301 A1 WO 2014119301A1 JP 2014000461 W JP2014000461 W JP 2014000461W WO 2014119301 A1 WO2014119301 A1 WO 2014119301A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- acid
- composition
- sin
- colloidal silica
- Prior art date
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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
- C09G1/06—Other polishing compositions
-
- 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
- H01L21/31—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
Definitions
- the present invention provides silica and water-soluble properties having a high polishing rate ratio of the silicon nitride (SiN) surface to the silicon oxide surface and / or a high polishing rate ratio of the SiN surface to the polycrystalline silicon (polySi) surface.
- the present invention relates to a polishing composition containing a polymer.
- the silicon nitride film removal step in semiconductor device manufacturing can be seen in various aspects such as removal of a silicon nitride film as a stop film in the element isolation structure formation step.
- a step involves using a phosphoric acid / nitric acid mixture or the like at about 150 ° C.
- the wet etching process is performed at a high temperature, and a polishing process using abrasive grains is rarely used.
- phosphoric acid itself is permeable to the silicon film and the silicon oxide film, it may affect the electrical characteristics of the manufactured semiconductor.
- reducing the addition amount of phosphoric acid or a phosphoric acid derivative not only decreases the polishing rate of the silicon nitride film, but also deteriorates the removal efficiency of the silicon nitride film, as well as the selectivity ratio. Will also decline.
- the silicon oxide film, which should originally be a polishing stopper film is also incidentally polished, and flatness is impaired by erosion that generates a relative recess according to the exposure density of the stopper film.
- Patent Document 2 discloses that the pH of the polishing slurry is adjusted within a range of 1 to 5 in order to provide a polishing composition having a high selectivity with respect to nitride (silicon nitride film or the like).
- nitride silicon nitride film or the like.
- Patent Document 3 proposes a polishing composition having a pH of 2.5 to 5 containing colloidal silica and a sulfonic acid group or an organic acid having a sulfonic acid group.
- this polishing composition also does not sufficiently satisfy the user's requirements regarding the polishing rate of silicon nitride.
- An object of the present invention is to provide a polishing composition and a polishing method for polishing SiN with a high selectivity.
- the polishing rate ratio of the silicon nitride (SiN) surface to the polishing rate of the silicon oxide surface is high, and the surface of polycrystalline silicon (Poly-Si, polysilicon)
- a polishing composition comprising silica and a water-soluble polymer, which has a characteristic that the ratio of the polishing rate of the SiN surface to the polishing rate is high.
- such a polishing composition comprises silica and a water-soluble polymer and has a pH of 6 or less, wherein the silica comprises one or more organic acids bonded to its surface and is water-soluble.
- the polymer is a polyoxyalkylene hydrocarbyl ether where the hydrocarbyl group has 12 or more carbon atoms.
- the silica is colloidal silica.
- Silica is an effective abrasive for polishing and / or grinding various surfaces as provided herein.
- the polyoxyalkylene hydrocarbyl ether is C 18 H 37 O (CH 2 CH 2 O) 20 H or polyoxyethylene (20) stearyl ether.
- the polyoxyalkylene hydrocarbyl ether is present in the composition at 0.001% to 0.5% by weight.
- the polyoxyalkylene hydridocarbyl ether is present in the composition at 100 to 450 ppm by weight.
- the polishing rate ratio of the SiN surface to the polishing rate of the silicon oxide and / or polysilicon surface tends to be low.
- the composition further comprises an organic acid other than the organic acid combined with the colloidal silica.
- the SiN / silicon oxide and / or SiN / polysilicon removal selectivity of the polishing composition provided by the present invention is controlled by dilution of the polishing composition, particularly the silica component of the composition. .
- lower silica concentration results in higher SiN / silicon oxide removal selectivity.
- the SiN / polysilicon removal selectivity of the polishing composition of the present invention is controlled by changing the concentration of the water soluble polymer. The higher the water-soluble polymer concentration, the higher the SiN / polysilicon removal selectivity. Without being bound by theory, it is believed that the water soluble polymer is more prevalent on and / or coats polysilicon than on SiN, thus preventing removal of polysilicon during polishing.
- a method for polishing comprising using the polishing composition of the present invention.
- the polishing composition and method of the present invention are useful, for example, in semiconductor device manufacturing processes.
- such compositions are useful in methods that use a soft polishing pad.
- soft pads include, but are not limited to, soft pads made of polyurethane.
- such compositions are useful in methods using hard or medium hardness polishing pads. Examples of such hard pads include, but are not limited to, hard pads made of polyurethane.
- the method for polishing comprises contacting SiN, silicon oxide, and / or polysilicon with the polishing composition of the present invention.
- SiN is selectively removed relative to silicon oxide and / or polysilicon.
- the graph shows that the number of defects of sample A, which is the polishing composition of the present invention, is the same as or smaller than that of sample B of the conventional example.
- Sample A a polishing composition of the present invention, has a better polishing function selective to SiN than TEOS silica and polysilicon, and graphically shows the effect of composition concentration on polishing rate and selectivity.
- the polishing rate of sample A is shown by a graph and a table.
- concentration of the component in the polishing composition of this invention has on polishing rate and polishing selectivity is shown with a graph.
- concentration of the component in the polishing composition of this invention has on polishing rate and polishing selectivity is shown with a graph.
- a pH adjuster means one or more pH adjusters.
- “About” refers to an amount of ⁇ 1%, ⁇ % 5%, or ⁇ 10%, as the context indicates. As used herein, all amounts, numbers, and ranges are preceded by the word “about”.
- “Hydrocarbyl” refers to a moiety containing carbon and hydrogen atoms. The number of carbon atoms is usually about 1 to 70 (C 1 to C 70 ).
- Alkyl refers to a saturated, linear or branched monovalent hydrocarbyl moiety. The number of carbon atoms is usually 1-40.
- Alkenyl refers to a straight or branched monovalent hydrocarbyl moiety containing up to 5 carbon-carbon double bonds. The number of carbon atoms is usually 1-40.
- Alkynyl refers to a straight or branched monovalent hydrocarbyl moiety containing up to 5 carbon-carbon triple bonds. The number of carbon atoms is usually 1-40.
- Aryl refers to an aromatic cyclic hydrocarbyl moiety. The number of carbon atoms is usually 6-10.
- Cycloalkyl refers to a cyclic non-aromatic hydrocarbyl moiety. Cycloalkyls can be fully saturated or partially unsaturated. The number of carbon atoms is usually 3-15. Partially unsaturated cycloalkyl groups contain 1 to 4 carbon-carbon double bonds.
- Alkylene refers to a saturated, divalent linear or branched hydrocarbyl moiety. The number of carbon atoms is usually 2 to 200.
- Polyoxyalkylene refers to an alkylene having 8 to 60 oxygen atoms replacing a carbon atom chain. The repeating number of oxyalkylene is usually 8 to 60.
- composition and method The present invention provides a polishing composition that exhibits a high polishing rate ratio of the SiN surface to the silicon oxide surface and the SiN surface to the polysilicon surface.
- a composition comprises silica and a water soluble polymer and has a pH of 6 or less.
- the silica contains one or more organic acids or salts thereof bonded to its surface
- the water-soluble polymer is a polyoxyalkylene hydrocarbyl ether whose hydrocarbyl group has 12 or more carbon atoms.
- the polishing rate ratio of the SiN surface to the polishing rate of the silicon oxide and / or polysilicon surface tends to be low.
- the silica is colloidal silica.
- the silica comprises silica derivatized with 1-6, 2-5, or 3-4 types of organic acid groups or salts thereof attached to each particle.
- the organic acid is one or both of a carboxylic acid and a sulfonic acid.
- One skilled in the art will understand how to covalently bond such organic acids to silica such that the functional groups of the organic acid are bonded to silica.
- sulfonic acid a kind of organic acid
- colloidal silica For example, if sulfonic acid, a kind of organic acid, is covalently bonded to colloidal silica, Cano-Serrano et al., “Sulfonic acid-functionalized silica through quantitative oxidation of thiol groups”, Chem. Commun., 246-247 (2003) can be referred to.
- a silane coupling agent having a thiol group such as 3-mercaptopropyltrimethoxysilane is coupled to colloidal silica and then oxidized with hydrogen peroxide to fix the sulfonic acid on the surface.
- the colloidal silica thus obtained can be obtained.
- colloidal silica having a carboxylic acid immobilized on the surface can be obtained by irradiating light after coupling a silane coupling agent containing a photoreactive 2-nitrobenzyl ester to colloidal silica.
- the colloidal silica has an average primary particle size of at least 5 nm, 7 nm, or 10 mm. In some embodiments, as the average primary particle size of colloidal silica increases, the polishing rate of SiN with the polishing composition of the present invention increases. In other embodiments, the average primary particle size of colloidal silica is 150 nm or less, 120 nm or less, or 100 nm or less. The average primary particle diameter of colloidal silica is calculated based on the specific surface area of colloidal silica by, for example, the BET adsorption method. In another embodiment, the colloidal silica is in a non-granular or non-spherical form.
- colloidal silica having a non-spherical shape two or more primary particles may be connected.
- the average degree of association of the colloidal silica is 1.2 or more, or 1.5 or more in some embodiments. In other embodiments, the average degree of association of the colloidal silica is 4.0 or less, 3.0 or less, or 2.5 or less.
- the content of colloidal silica is in some embodiments at least 0.05%, at least 0.1%, or at least 0.3% by weight relative to the total weight of the composition. In other embodiments, the colloidal silica content is less than 5%, less than 1%, or less than 0.9% by weight relative to the total weight of the composition. In other embodiments, the colloidal silica is present in an amount of 0.5%, 0.2-0.8%, or 0.1-0.9% by weight relative to the total weight of the composition.
- the polishing composition of the present invention comprises a water-soluble polymer. In some embodiments, the polishing composition of the invention essentially comprises a water soluble polymer. In some embodiments, the water soluble polymer may be referred to as a surfactant. In one embodiment, the water soluble polymer is of formula (I)
- the water-soluble polymer is of the formula (II)
- the water-soluble polymer is of the formula (III) Or the sulfate, organic carboxylate, or phosphate ester.
- m is 10 to 30, n is 0 to 30, and R 1 and R 1 are hydrocarbyl moieties.
- the structures of formula (I) and formula (II) are meant to include copolymers and block polymers of ethylene and propylene glycol.
- the structure of formula (III) is meant to include copolymers and block polymers of ethylene and methylethylene glycol.
- R 1 is C 10 -C 30 alkyl, C 10 -C 30 alkenyl, or C 10 -C 30 alkynyl, wherein each alkyl, alkenyl, or alkynyl group is optionally 1-3 C 6 -C. Substituted with 10 aryl or C 3 -C 10 cycloalkyl groups. In another embodiment, R 1 is C 6 -C 10 aryl or C 3 -C 10 cycloalkyl, optionally substituted with 1-3 C 1 -C 6 alkyl groups. In another embodiment, R 1 is C 15 -C 25 alkyl or C 17 -C 23 alkyl. In one embodiment, n is at least 1. In another embodiment, n is 0.
- m is 15-25 or 18-22. In another embodiment, m + n is 15-25.
- the water soluble polymer is of the formula C 18 H 37 —CH 2 —O— (CH 2 CH 2 O) 20 H or C 18 H 37 —O— (CH 2 CH 2 O) 20 H. is there.
- the water soluble polymer has a hydrophobic lipophilic balance (HLB) value that is at least 10, at least 12, or at least 14. In other embodiments, the water soluble polymer has an HLB value that is 20 or less. In yet another embodiment, the HLB value is 11-20, 12-19, 13-18, or about 14-17. When the HLB value is less than 10, the water-soluble polymer is hardly dissolved in water, and the polishing rate ratio of the SiN surface to the polishing rate of the silicon oxide and / or polysilicon surface tends to be low.
- HLB hydrophobic lipophilic balance
- the water soluble polymer is present in the composition in an amount of 0.001 g / L or more, 0.005 g / L or more, or 0.01 g / L or more. In other embodiments, the water soluble polymer is present in an amount of 10 g / L or less, 5 g / L or less, or 1 g / L or less. In other embodiments, the water soluble polymer is present in the composition at 0.001% to 0.5% by weight. In other embodiments, the water soluble polymer is present in the composition at 200 ppm (or 0.02%) or less, 100-450 ppm, or 50-450 ppm.
- the composition contains a water-soluble polymer in an amount of 100 to 450 ppm, it is more preferable because SiN removal selectivity is good.
- the polishing composition of the present invention comprising 200 ppm of the water-soluble polymer of formula (I) above is a surprising SiN removal option for polysilicon and silicon oxide, as shown in the examples (tables and figures) herein. Demonstrated sex.
- the pH of the composition is 6 or less. In other embodiments, the pH is 5 or less, 4 or less, or 4.5 or less. In other embodiments, the pH is 1 or more, 1.5 or more, or 2.5 or more. In one embodiment, the pH is 3. In some embodiments, if the pH exceeds 6, it may be difficult to polish SiN at high speed using the composition.
- a pH adjusting agent can be used to adjust the pH of the composition to a desired value.
- the pH adjuster used can be an inorganic or organic acid, or a chelating agent. Examples of the inorganic acid include, but are not limited to, hydrogen chloride, sulfuric acid, nitric acid, fluorine acid, boric acid, carbonic acid, hypophosphorous acid, phosphonic acid, and phosphoric acid.
- organic acid examples include formic acid, acetic acid, propionic acid, butanoic acid, valeric acid, 2-methylbutyric acid, N-hexanoic acid, 3,3-dimethylbutanoic acid, 2-ethylbutanoic acid, 4-methylpentanoic acid, n -Heptanoic acid, 2-methylhexanoic acid, n-octanoic acid, 2-ethylhexanoic acid, benzoic acid, glycolic acid, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, Mention may be made of maleic acid, phthalic acid, malic acid, tartaric acid, citric acid, lactic acid, diglycolic acid, 2-furancarboxylic acid, 3-furancarboxylic acid, 2-tetrahydrofurancarboxylic acid, methoxyacetic acid, methoxy
- organic acids include, but are not limited to, organic sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, and isethionic acid.
- salts of inorganic or organic acids such as ammonia salts and alkali metal salts can be used as a pH adjuster in combination with one or more inorganic or organic acids.
- chelating agents include, but are not limited to, hydroxyethylimino-2-acetic acid, iminodiacetic acid, acetamidoiminodiacetic acid, nitrilo-3-propanoic acid, nitrilo-3-methylphosphonic acid, nitrilotriacetic acid, diethylenetriamine
- examples include pentaacetic acid and ethylenediaminetetraacetic acid.
- lactic acid or other organic acid is present at 0.001-1%, 0.01-0.1%, or 0.09% by weight based on the composition.
- the polishing composition can polish SiN at high speed, but it may not be desirable to polish polysilicon at high speed.
- the ratio of the polishing rate of SiN to the polishing rate of polysilicon is preferably 2 or more, more preferably 4 or more, more preferably Is 6 or more.
- the ratio of the polishing rate of SiN to the polishing rate of silicon oxide and / or polysilicon is preferably 2 More preferably, it is 4 or more, more preferably 6 or more.
- the polishing rate of the SiN surface relative to the polishing rate of the silicon oxide surface and / or the surface of the polysilicon is equivalent or high.
- the zeta potential of colloidal silica having an organic acid (a plurality of organic acids) bonded to the surface thereof is a negative potential.
- the zeta potential of SiN is positive. Therefore, when the pH of the polishing composition of the present invention is 6 or less, colloidal silica in the polishing composition is attracted to SiN by static electricity. Therefore, according to this composition for polishing, SiN can be polished at a high speed, and as a result, SiN can be preferentially polished at a higher speed than silicon oxide or polysilicon.
- the polishing composition of the present invention may further comprise an oxidizing agent, such as hydrogen peroxide, or a disinfectant or antifungal agent.
- oxidizing agent such as hydrogen peroxide
- disinfectants and antifungal agents include 2-methyl-4-isothiazolin-3-one and 5-chloro-methyl-4-isothiazolin-3-one, p-hydroxybenzoate, and phenoxyethanol These are isothiazoline-based disinfectants.
- the polishing composition used in polishing is prepared by diluting a stock solution (concentrate) of the polishing composition 4 to 10 times or more with a diluent such as an aqueous solution or water.
- polishing compositions and methods for producing and using them are described in WO 2012/026329 (which is also incorporated herein by reference), which are appropriately modified and adapted in view of the method of the present invention.
- WO 2012/026329 which is also incorporated herein by reference
- other compositions than methods of the invention and methods of producing and using the compositions and compositions described herein can be provided.
- colloidal silica and a water-soluble polymer eg, polyoxyethylene (20) stearyl ether
- a pH adjuster eg, lactic acid
- the temperature at which each component is mixed is not particularly limited, but is preferably 10 to 40 ° C., and may be heated to increase the dissolution rate. Further, the mixing time is not particularly limited.
- a polishing apparatus a general holder having a polishing surface plate on which a holder for holding a substrate having a polishing object and a motor capable of changing the number of rotations are attached and a polishing pad (polishing cloth) can be attached.
- a polishing apparatus can be used.
- the polishing conditions are not particularly limited.
- the rotation speed of the polishing platen is preferably 10 to 500 rpm, and the pressure (polishing pressure) applied to the substrate having the object to be polished is preferably 0.5 to 10 psi.
- the method of supplying the polishing composition to the polishing pad is not particularly limited, and for example, a method of continuously supplying with a pump or the like is employed. Although the supply amount is not limited, it is preferable that the surface of the polishing pad is always covered with the polishing composition of the present invention. After the polishing is completed, the substrate is washed in running water, and water droplets adhering to the substrate are removed by a spin dryer or the like and dried to obtain a substrate.
- the wafer is polished for a fixed time, and the polishing rate of the surface of another wafer described in the embodiment such as SiN is measured.
- the polishing rate is calculated by measuring the difference in wafer thickness before and after polishing and the polishing time.
- the difference in thickness is measured using, for example, an optical interference type film thickness measuring device.
- Colloidal silica with sulfonic acid covalently bonded to the surface (average primary particle size of about 35 nm, average secondary particle size of about 70 nm): 0.5%, lactic acid: 0.09%, polyoxyethylene (20) stearyl ether: 200 ppm
- Sample A which is a polishing composition in which the pH of the slurry was adjusted to 3, was obtained.
- the composition of the same composition was prepared except not containing polyoxyethylene (20) stearyl ether, and the sample B was obtained.
- polishing composition Polishing was performed at a supply rate of the material slurry of 300 mL / min, a polishing pressure of 2 psi, and a platen rotation speed of 120 rpm.
- the polishing rate obtained for each wafer is shown in Table 1 and FIG.
- the supply rate of the polishing composition slurry is a value obtained by assigning the total supply amount of all the supply liquids per unit time (the same applies to the following examples). It can be seen that by using Sample A, which is the polishing composition of the present invention, a high polishing rate can be obtained for each wafer, and in particular, a high polishing rate ratio (> 10: 1) of SiN to TEOS can be obtained.
- the hard polyurethane pad (Shore hardness D60) and the soft polyurethane pad (Shore hardness A63) were respectively obtained using the sample A obtained in Example 1 and the sample A (concentration) which is a polishing composition obtained by concentrating the sample A four times.
- the polishing rate when polishing with a polishing composition slurry supply speed of 300 mL / min, polishing pressure of 2 psi, and platen rotation speed of 100 rpm for TEOS, polysilicon, and SiN wafers with a diameter of 300 mm is shown in FIG.
- the graph is shown in FIG.
- Sample A which is the polishing composition of the present invention, and its concentrated composition
- a high polishing rate ratio of SIN to TEOS and polysilicon can be obtained, but the polishing rate decreases as the concentration of the polishing composition decreases. I understand that.
- the polishing composition slurry was supplied at a rate of 300 mL / min. 4 and Table 2 show the polishing rates when polishing was performed at a pressure of 2 psi, a platen rotation speed of 87 rpm, and a head rotation speed of 81 rpm, respectively. It can be seen that a high polishing rate ratio of SiN to TEOS can be obtained by using Sample A which is the polishing composition of the present invention and its diluted composition.
- polishing compositions 1 to 9 having the compositions shown in Table 3 and supplying a polishing composition slurry for TEOS silica, polysilicon, and SiN having a diameter of 200 mm using soft polyurethane pads (Shore hardness A63), respectively.
- the polishing rates when polishing was performed at a speed of 200 mL / min, a polishing pressure of 2 psi, and a platen rotation speed of 120 rpm are shown in graphs in FIGS. 5A and 5B, respectively. It can be seen that the TEOS removal rate is increased by increasing the concentration of the abrasive grains (silica) in the polishing composition, but the removal selectivity of SiN: TEOS silica is lowered.
- Table 4 shows the storage stability by comparing the physical properties of Sample A and Sample A (concentrated) obtained by concentrating Sample A four times and their properties at 55 ° C. It is shown that the storage stability is slightly deteriorated by diluting sample A (concentrated) which is the polishing composition of the present invention.
- Table 5 shows the composition and physical properties of the polishing composition of the present invention, and Table 6 shows the content of trace metals.
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Abstract
Description
例えば、特許文献1に記載の方法では、酸化シリコン砥粒に対して燐酸あるいは燐酸誘導体を添加することで、(窒化シリコン膜に対する研磨速度)/(酸化シリコン膜に対する研磨速度)で表される選択比が最大で10倍前後となっている。特許文献1に記載の研磨用組成物の場合、窒化シリコン膜を研磨して酸化シリコン膜と窒化シリコン膜が共存する面が露出した時点で研磨を終了する工程においては、残留すべき窒化シリコン膜が過剰研磨時に化学的侵食される弊害がある程度生じてしまう。また、燐酸自体がシリコン膜や酸化シリコン膜に対して浸透性を有している為、製造される半導体の電気的特性に影響を及ぼす可能性もある。これらの悪影響を防止または抑制する目的で、燐酸または燐酸誘導体の添加量を減少させると、窒化シリコン膜の研磨速度が低下してしまって窒化シリコン膜の除去能率が悪化するだけでなく、選択比も低下してしまう。この結果、本来、研磨停止膜であるべき酸化シリコン膜をも付随的に研磨され、停止膜の露出密度に応じて相対的な凹部を発生させるエロージョンにより、平坦性が損なわれることとなる。
さらに、特許文献3では、コロイダルシリカとスルホン酸基又はスルホン酸基を有する有機酸とを含有するpHが2.5~5の研磨組成物が提案されている。しかしながら、この研磨組成物も窒化ケイ素の研磨速度に関するユーザーの要求を十分に満足するものではない。
一実施形態において、このような研磨組成物はシリカ及び水溶性ポリマーを含み、6以下のpHを有し、この際、シリカはその表面に結合した状態で1以上の有機酸を含み、水溶性ポリマーはヒドロカルビル基が12以上の炭素原子を有するポリオキシアルキレンヒドロカルビルエーテルである。
一実施形態において、ポリオキシアルキレンヒドロカルビルエーテルは、C18H37O(CH2CH2O)20H又はポリオキシエチレン(20)ステアリルエーテルである。
他の実施形態において、ポリオキシアルキレンヒドロカルビルエーテルは、質量%で組成物中0.001%~0.5%存在する。他の実施形態において、ポリオキシアルキレンヒロドカルビルエーテルは、質量比で組成物中100~450ppm存在する。研磨組成物中のポリオキシアルキレンヒドロカルビルエーテルが0.001%未満または0.5%を超えると酸化シリコン及び/又はポリシリコン表面の研磨速度に対するSiN表面の研磨速度比が低くなる傾向にある。
様々な実施形態において、本発明で提供される研磨組成物のSiN/酸化シリコン及び/又はSiN/ポリシリコン除去選択性は、研磨組成物の希釈、特に組成物のシリカ成分の希釈によって制御される。いくつかの実施形態では、シリカ濃度が低くなると、SiN/酸化シリコン除去選択性が高くなる。
意外なことに、本発明の研磨組成物のSiN/ポリシリコン除去選択性は、水溶性ポリマーの濃度を変化させることによって制御される。水溶性ポリマーの濃度が高くなればなるほど、SiN/ポリシリコン除去選択性が高くなる。理論によって束縛されるものではないが、水溶性ポリマーは、SiN上よりもポリシリコン上に広範囲に存在する及び/又はポリシリコンを被覆するので、研磨中にポリシリコンの除去を妨げると考えられる。
別の実施形態において、研磨のための方法は、SiN、酸化シリコン、及び/又はポリシリコンを、本発明の研磨組成物に接触させることを含む。別の実施形態では、SiNは、酸化シリコン及び/又はポリシリコンに対して選択的に除去される。
「約」は、文脈が示すとおり、ある量の±1%、±%5%、又は±10%を指す。本明細書で用いる場合、あらゆる量、数、及びその範囲は、「約」という言葉を前に付す。
「ヒドロカルビル」は、炭素原子及び水素原子を含有する部位を指す。炭素原子数は、通常約1~70(C1~C70)である。
「アルキル」は、飽和の、直鎖又は分岐の1価のヒドロカルビル部を指す。炭素原子数は、通常1~40である。
「アルケニル」は、5までの炭素-炭素二重結合を含有する、直鎖又は分岐の1価のヒドロカルビル部を指す。炭素原子数は、通常1~40である。
「アルキニル」は、5までの炭素-炭素三重結合を含有する、直鎖又は分岐の1価のヒドロカルビル部を指す。炭素原子数は、通常1~40である。
「シクロアルキル」環式の非芳香族ヒドロカルビル部を指す。シクロアルキルは、完全に飽和しているか又は部分的に不飽和の場合がある。炭素原子数は、通常3~15である。部分的に不飽和のシクロアルキル基は1~4の炭素-炭素二重結合を含有する。
「アルキレン」は、飽和の、2価の直鎖又は分岐のヒドロカルビル部を指す。炭素原子数は、通常2~200である。
「ポリオキシアルキレン」は、8~60の酸素原子が炭素原子鎖を置換したアルキレンを指す。オキシアルキレンの繰り返し数は、通常8~60である。
本発明は、酸化シリコン表面に対するSiN表面の、及びポリシリコン表面に対するSiN表面の高い研磨速度比を示す研磨組成物を提供する。一態様において、そのような組成物はシリカ及び水溶性ポリマーを含み、6以下のpHを有する。この場合、シリカはその表面に結合した状態で1つ以上の有機酸又はその塩を含み、水溶性ポリマーはヒドロカルビル基が12以上の炭素原子を有するポリオキシアルキレンヒドロカルビルエーテルである。炭素原子が12未満の場合、酸化シリコン及び/又はポリシリコン表面の研磨速度に対するSiN表面の研磨速度比が低くなる傾向にある。
一実施形態において、シリカはコロイダルシリカである。一実施形態において、シリカは、各粒子に結合された1~6、2~5、又は3~4の種類の有機酸基又はその塩で誘導体化したシリカを含む。いくつかの実施形態では、有機酸はカルボキシル酸及びスルホン酸の1つ又は双方である。有機酸の官能基がシリカに結合されるように、そのような有機酸をシリカへ共有結合する方法は、当業者には理解されよう。例えば、有機酸の一種であるスルホン酸をコロイダルシリカに共有結合するのであれば、Cano-Serrano et al.,"Sulfonic acid-functionalized silica through quantitative oxidation of thiol groups"、Chem. Commun., 246-247 (2003) を参照することができる。具体的には、3-メルカプトプロピルトリメトキシシラン等のチオール基を有するシランカップリング剤をコロイダルシリカにカップリングさせた後に過酸化水素でチオール基を酸化することにより、スルホン酸が表面に固定化されたコロイダルシリカを得ることができる。あるいは、例えば、カルボン酸をコロイダルシリカに共有結合するのであれば、Yamaguchi et al.,”Novel silane coupling agents containing a photolabile 2-nitrobenzyl ester for introduction of a carboxy group”, Chemistry Letters, 3, 228-229 (2000)を参照することができる。具体的には、光反応性2-ニトロベンジルエステルを含むシランカップリング剤をコロイダルシリカにカップリングさせた後に光照射することにより、カルボン酸が表面に固定化されたコロイダルシリカを得ることができる。
他の実施形態において、コロイダルシリカの平均一次粒子径は150nm以下、120nm以下、又は100nm以下である。コロイダルシリカの平均一次粒子径は、例えばBET吸着法によってコロイダルシリカの比表面積に基づいて算出される。
別の実施形態において、コロイダルシリカは非粒状又は非球形の形態である。非球形の形状のコロイダルシリカでは、2つ以上の一次粒子が連結する場合がある。コロイダルシリカの平均会合度については、いくつかの実施形態において1.2以上、又は1.5以上である。他の実施形態では、コロイダルシリカの平均会合度は4.0以下、3.0以下、又は2.5以下である。
B.水溶性ポリマー
いくつかの実施形態において、本発明の研磨組成物は水溶性ポリマーを含む。いくつかの実施形態では、本発明の研磨組成物は本質的に水溶性ポリマーを含有する。いくつかの実施形態では、水溶性ポリマーを界面活性剤と称する場合がある。一実施形態では、水溶性ポリマーは式(I)のものであるか、
また、別の実施形態では、水溶性ポリマーは式(II)のものであるか、
また、別の実施形態では、水溶性ポリマーは式(III)のものであるか、
あるいはその硫酸塩、有機カルボキシレート、又はリン酸エステルである。
一実施形態において、nは少なくとも1である。別の実施形態において、nは0である。別の実施形態では、mは15~25又は18~22である。別の実施形態では、m+nは15~25である。別の実施形態では、水溶性ポリマーは式C18H37-CH2-O-(CH2CH2O)20H又はC18H37-O-(CH2CH2O)20Hのものである。
一実施形態において、組成物のpHは6以下である。他の実施形態では、pHは5以下、4以下、又は4.5以下である。他の実施形態では、pHは1以上、1.5以上、又は2.5以上である。一実施形態では、pHは3である。いくつかの実施形態において、pHが6を超える場合、組成物を用いて高速でSiNを研磨することが難しい場合がある。
組成物のpHを所望の値に調節するために、pH調整剤を用いることができる。用いるpH調整剤は、無機酸もしくは有機酸とすることができ、又はキレート剤とすることができる。
無機酸としては、例えば、塩化水素、硫酸、硝酸、フッ素酸、ホウ酸、炭酸、次亜リン酸、ホスホン酸、リン酸が挙げられるが、限定されるものではない。
他の実施形態において、無機酸又は有機酸のアンモニア塩及びアルカリ金属塩等の塩を、1つ以上の無機酸又は有機酸と組み合わせて、pH調整剤として用いることができる。
一実施形態において、乳酸又は他の有機酸は、組成物に対して質量%で0.001~1%、0.01~0.1%、又は0.09%存在する。
いくつかの実施形態において、研磨のための組成物はSiNを高速で研磨することができるが、ポリシリコンを高速で研磨することは望ましくない場合がある。研磨対象の物体の表面がSiNだけでなくポリシリコンも含有するいくつかの実施形態において、ポリシリコンの研磨速度に対するSiNの研磨速度の比は、好ましくは2以上、さらに好ましくは4以上、より好ましくは6以上である。
研磨対象の物体の表面がSiNだけでなく酸化シリコン及び/又はポリシリコンも含有するいくつかの実施形態において、酸化シリコン及び/又はポリシリコンの研磨速度に対するSiNの研磨速度の比は、好ましくは2以上、さらに好ましくは4以上、より好ましくは6以上である。このため、いくつかの実施形態において、本発明の研磨組成物を用いて同様の研磨条件のもとで、酸化シリコン表面及びSiN表面、又はポリシリコン表面及びSiN表面を別個に研磨する場合、本明細書で記載するように、酸化シリコン表面及び/又はポリシリコンの表面の研磨速度に対するSiN表面の研磨速度は同等であるか又は高い。
従って、研磨のためのこの組成物によれば、SiNを高速度で研磨することができ、その結果、酸化シリコンやポリシリコンよりもSiNを優先的に高速で研磨することができる。
いくつかの実施形態において、本発明の研磨組成物は更に、過酸化水素等の酸化剤、又は消毒剤又は抗真菌剤を含んでもよい。消毒剤及び抗真菌剤の限定的でない例としては、2-メチル-4-イソチアゾリン-3-オン及び5-クロロ-メチル-4-イソチアゾリン-3-オン、p-ヒドロキシ安息香酸エステル、及びフェノキシエタノール等のイソチアゾリン系消毒剤が挙げられる。
いくつかの実施形態では、研磨で使用される研磨組成物は、水溶液又は水等の希釈液を用いて、研磨組成物の原液(濃縮品)を4~10倍以上に希釈することによって調製される。
他の研磨組成物及びこれを生成し用いる方法は、WO2012/026329(引用により本願にも含まれるものとする)に記載されており、これを本発明の方法を考慮して適宜変更し適合させることで、発明の方法以外の他の組成物ならびにその組成物及び本明細書に記載の組成物を生成する方法、使用する方法を提供することができる。
一般に、コロイダルシリカ及び水溶性ポリマー(例えば、ポリオキシエチレン(20)ステアリルエーテル)を水中で混合し、組成物のpHをpH調製剤(例えば、乳酸)によって適切に調整する。各成分を混合する際の温度は特に制限されないが、10~40℃が好ましく、溶解速度を上げるために加熱してもよい。また、混合時間も特に制限されない。
研磨装置としては、研磨対象物を有する基板等を保持するホルダーと回転数を変更可能なモータ等とが取り付けてあり、研磨パッド(研磨布)を貼り付け可能な研磨定盤を有する一般的な研磨装置を使用することができる。
研磨終了後、基板を流水中で洗浄し、スピンドライヤ等により基板上に付着した水滴を払い落として乾燥させることにより、基板が得られる。
一定時間においてウェハの研磨を行い、SiN等の実施例に記載した他のウェハの表面の研磨速度を測定する。研磨前後のウェハの厚さの差及び研磨時間を測定することによって、研磨速度を計算する。厚さの差は、例えば光干渉式膜厚測定装置を用いて測定する。
本発明の研磨組成物であるサンプルAを使用することにより、各ウェハについて高い研磨速度が得られ、特に、TEOSに対するSiNの高い研磨速度比(>10:1)を得られることがわかる。
本発明の研磨組成物であるサンプルAを使用することにより、表面欠陥の数を大幅に減らすことができた。
本発明の研磨組成物であるサンプルA及びその濃縮組成物を使用することにより、TEOS及びポリシリコンに対するSINの高い研磨速度比を得られるが、研磨組成物の濃度が低くなると研磨速度が低下することがわかる。
本発明の研磨組成物であるサンプルA及びその希釈組成物を使用することにより、TEOSに対するSiNの高い研磨速度比が得られることがわかる。
研磨組成物中の砥粒(シリカ)の濃度を高くすることによりTEOS除去率が高くなるが、SiN:TEOSシリカの除去選択性が低くなることがわかる。
Claims (7)
- コロイダルシリカ及び水溶性ポリマーを含む研磨組成物であって、
前記研磨組成物は6以下のpHを有し、
前記コロイダルシリカが前記コロイダルシリカに結合された有機酸を含み、
前記水溶性ポリマーがポリオキシアルキレンヒドロカルビルエーテルを含み、
前記ポリオキシアルキレンヒドロカルビルエーテル中のヒドロカルビル基が12個以上の炭素原子を有する研磨組成物。 - 前記ポリオキシアルキレンヒドロカルビルエーテルは11~20の疎水性親油性バランス(HLB)値を有する請求項1に記載の組成物。
- 前記ポリオキシアルキレンヒドロカルビルエーテルがポリオキシエチレン(20)ステアリルエーテルである請求項1に記載の組成物。
- 前記ポリオキシアルキレンヒドロカルビルエーテルが、質量比で、前記組成物中100~450ppm存在する請求項1~4のいずれか1項に記載の組成物。
- SiN、酸化シリコン、及び/又はポリシリコンを、請求項1~5のいずれか1項に記載の組成物に接触させることを含む研磨方法。
- 前記SiNが、酸化シリコン及び/又はポリシリコンに対して選択的に除去される請求項6に記載の方法。
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US10703936B2 (en) | 2016-03-30 | 2020-07-07 | Fujimi Incorporated | Polishing composition |
Also Published As
Publication number | Publication date |
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US20140220779A1 (en) | 2014-08-07 |
SG11201505490RA (en) | 2015-08-28 |
KR20150113956A (ko) | 2015-10-08 |
CN104968754A (zh) | 2015-10-07 |
EP2952550A4 (en) | 2016-09-28 |
TW201431990A (zh) | 2014-08-16 |
JPWO2014119301A1 (ja) | 2017-01-26 |
JP6050839B2 (ja) | 2016-12-21 |
EP2952550A1 (en) | 2015-12-09 |
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