WO2017169539A1 - 表面処理組成物、表面処理組成物の製造方法、表面処理方法および半導体基板の製造方法 - Google Patents
表面処理組成物、表面処理組成物の製造方法、表面処理方法および半導体基板の製造方法 Download PDFInfo
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- WO2017169539A1 WO2017169539A1 PCT/JP2017/008837 JP2017008837W WO2017169539A1 WO 2017169539 A1 WO2017169539 A1 WO 2017169539A1 JP 2017008837 W JP2017008837 W JP 2017008837W WO 2017169539 A1 WO2017169539 A1 WO 2017169539A1
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- WIPO (PCT)
- Prior art keywords
- surface treatment
- polishing
- sulfonic acid
- polished
- treatment composition
- Prior art date
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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 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
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/04—Carboxylic acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/34—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5009—Organic solvents containing phosphorus, sulfur or silicon, e.g. dimethylsulfoxide
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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
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
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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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
- H01L21/02065—Cleaning during device manufacture during, before or after processing of insulating layers the processing being a planarization of insulating layers
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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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02074—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a planarization of conductive layers
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/22—Electronic devices, e.g. PCBs or semiconductors
Definitions
- the present invention relates to a surface treatment composition, a method for producing a surface treatment composition, a surface treatment method, and a method for producing a semiconductor substrate.
- CMP chemical mechanical polishing
- Impurities are produced by polishing abrasive grains derived from the polishing composition used in CMP, organic substances such as metals, anticorrosives, and surfactants, silicon-containing materials that are objects to be polished, metal wiring, plugs, etc.
- silicon-containing materials, metals, and organic substances such as pad scraps generated from various pads are included.
- the surface of the semiconductor substrate is contaminated with these impurities, it may adversely affect the electrical characteristics of the semiconductor and reduce the reliability of the device. Therefore, it is desirable to introduce a surface treatment process after the CMP process to remove these impurities from the surface of the semiconductor substrate.
- Japanese Patent Application Laid-Open No. 2012-74678 discloses a polycarboxylic acid or hydroxycarboxylic acid and a sulfonic acid type anionic property. It is disclosed that a cleaning composition for a semiconductor substrate containing a surfactant, a carboxylic acid type anionic surfactant, and water can remove defects without corroding the substrate surface. .
- the present inventors examined the relationship between the type of polished object to be polished and the type of defect. As a result, it has been found that an organic residue is likely to adhere to a polished polishing object containing silicon nitride, silicon oxide, or polysilicon that is particularly preferably used as a semiconductor substrate, and that such an organic residue can cause destruction of a semiconductor device. It was.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide means for sufficiently removing an organic residue remaining on the surface of a polished polishing object containing silicon nitride, silicon oxide, or polysilicon. To do.
- the present inventors proceeded with intensive studies. As a result, when the surface treatment composition contains a polymer compound having a sulfonic acid (salt) group under acidic conditions, the effect of removing organic residues on the surface of silicon nitride, silicon oxide or polysilicon is remarkably improved.
- the headline and the present invention were completed.
- the polished polishing object is a polished semiconductor substrate, A method for producing a semiconductor substrate, comprising a surface treatment step of reducing organic residue on the surface of the polished semiconductor substrate by the surface treatment method according to 7 or 8 above.
- X to Y indicating a range means “X or more and Y or less”.
- measurement of operation and physical properties is performed under the conditions of room temperature (20 to 25 ° C.) / Relative humidity 40 to 50% RH.
- the organic residue represents a component made of an organic substance such as an organic low molecular weight compound or a high molecular compound, an organic salt, or the like among defects attached to the surface of the surface treatment target.
- the organic residue adhering to the surface treatment target is, for example, pad scrap generated from a pad used in a polishing step described later or other rinse polishing step which may be optionally provided, or a polishing composition used in the polishing step Or components derived from additives contained in the rinse polishing composition used in the other rinse polishing step described later.
- the defect is an organic residue can be determined visually by SEM observation. Whether or not the defect is an organic residue may be determined by elemental analysis using an energy dispersive X-ray analyzer (EDX) as necessary.
- EDX energy dispersive X-ray analyzer
- the polished polishing object means a polishing object after being polished in the polishing step. Although it does not restrict
- the surface treatment composition according to one embodiment of the present invention is an organic residue remaining on the surface of a polished polishing object (also referred to as “surface treatment object” in this specification) containing silicon nitride, silicon oxide, or polysilicon. It is particularly preferred to be used to reduce In this specification, the polished polishing object containing silicon nitride, silicon oxide or polysilicon represents a polished polishing object containing silicon nitride, silicon oxide or polysilicon on the surface to be surface-treated. To do.
- TEOS TEOS type silicon oxide surface
- HDP film As a polished polishing object containing silicon oxide, for example, a TEOS type silicon oxide surface (hereinafter, also simply referred to as “TEOS” or “TEOS film”) generated using tetraethyl orthosilicate as a precursor, an HDP film, A USG film, a PSG film, a BPSG film, an RTO film, and the like can be given.
- the polished object to be polished is preferably a polished semiconductor substrate, and more preferably a semiconductor substrate after CMP. This is because, particularly, organic residue can cause damage to the semiconductor device. Therefore, when the polished object to be polished is a polished semiconductor substrate, the organic substrate residue can be removed as much as possible as the surface treatment step of the semiconductor substrate. Because it is necessary to be a thing.
- the polished object to be polished containing silicon nitride, silicon oxide or polysilicon is not particularly limited.
- a polished object to be polished comprising silicon nitride, silicon oxide and polysilicon alone, silicon nitride, silicon oxide or poly
- a polished polishing object in which a material other than these is exposed on the surface can be used.
- the former for example, a silicon nitride substrate, a silicon oxide substrate, or a polysilicon substrate, which is a conductor substrate, can be cited.
- the material exposed on the surface other than silicon nitride, silicon oxide, or polysilicon is not particularly limited, and examples thereof include tungsten.
- polished objects include a polished semiconductor substrate having a structure in which a silicon nitride film or a silicon oxide film is formed on tungsten and the tungsten portion and the silicon nitride film or silicon oxide film are exposed, tungsten Examples include, but are not limited to, a polished semiconductor substrate having a structure in which a portion, a silicon nitride film, and a silicon oxide film are all exposed.
- the surface treatment composition according to an embodiment of the present invention is used to reduce organic residue on the surface of a polished object that contains silicon nitride or silicon oxide.
- a polished object that contains silicon nitride or silicon oxide is preferable, and it is more preferably used to reduce organic residue on the surface of a polished polishing object containing silicon nitride.
- the reason for this is that the removal effect of the organic matter residue on the polished polishing object containing silicon nitride or silicon oxide is stronger than the removal effect of the organic matter residue on the polished polishing object containing polysilicon. .
- the positive charge of silicon nitride under acidic conditions described later is stronger than the positive charge of silicon oxide, and is applied to a polished polishing object containing silicon nitride by a polymer compound having a sulfonic acid (salt) group. This is because it is presumed that the organic substance residue removing action is more powerful.
- One embodiment of the present invention is a silicon nitride, silicon oxide, or polysiloxane containing a polymer compound having a sulfonic acid (salt) group (a sulfonic acid group-containing polymer) and water and having a pH value of less than 7. It is a surface treatment composition used for reducing organic residue on the surface of a polished polishing object containing silicon. According to the surface treatment composition according to the present embodiment, a means capable of sufficiently removing the organic residue remaining on the surface of the polished polishing object containing silicon nitride, silicon oxide, or polysilicon can be provided.
- the surface treatment composition according to one embodiment of the present invention is particularly preferably used as an organic residue reducing agent for selectively removing organic residues in the surface treatment step.
- the surface treatment composition removes defects on the surface of the surface treatment object as a result of chemical interaction as a result of the interaction between each component contained in the surface treatment composition and the surface and the defect of the surface treatment object. Or has a function of facilitating removal.
- the organic residue adhering to the surface treatment object includes a component that is likely to be positively charged under acidic conditions (hereinafter also referred to as “positively chargeable component”) and a positively charged under acidic conditions.
- positively chargeable component a component that is likely to be positively charged under acidic conditions
- hydrophobic components There are hydrophobic components that are difficult to occur (hereinafter also referred to as “hydrophobic components”), which must be removed by a separate mechanism.
- a positive charge is generated in the silicon nitride portion or the silicon oxide portion on the surface of the surface treatment object.
- some anionized sulfonic acid groups of the sulfonic acid group-containing polymer are directed to the surface of the surface treatment object, and anionized sulfonic acid groups other than the some anionized sulfonic acid groups are surface-treated.
- the sulfonic acid group-containing polymer is electrostatically adsorbed to the surface treatment object by facing toward the side opposite to the object surface side (side with water).
- the positively chargeable component of the organic residue generally has a positive charge under acidic conditions.
- some anionized sulfonic acid groups of the sulfonic acid group-containing polymer are directed to the positively chargeable component side, and anionized sulfonic acid groups other than the some anionized sulfonic acid groups are surface-treated.
- the sulfonic acid group-containing polymer is electrostatically adsorbed to the surface of the surface treatment object by facing the surface opposite to the object surface side (side with water).
- the surface treatment object is in a state of being charged to a negative charge as being covered with an anionized sulfonic acid group facing to the side opposite to the surface treatment object surface side (the side with water).
- the chargeable component is charged to a negative charge as it is covered with an anionized sulfonic acid group facing the side opposite to the surface side of the positively chargeable component (the side with water).
- the surface treatment object covered with the anionized sulfonic acid group and the positively chargeable component covered with the anionized sulfonic acid group are electrostatically repelled, so that the positively chargeable component becomes the surface. It will be removed from the surface of the processing object.
- the hydrophobic structure portion of the sulfonic acid group-containing polymer faces the hydrophobic component surface side, and the anionized sulfonic acid group that is a hydrophilic structure portion is on the hydrophobic component surface side.
- the opposite side the side with water
- the hydrophobic component and the sulfonic acid group-containing polymer form micelles covered with anionized sulfonic acid groups facing the side opposite to the hydrophobic component surface side (side with water).
- the hydrophobic component is removed from the surface of the surface treatment object by dissolving or dispersing the micelles in the surface treatment composition.
- the sulfonic acid group-containing polymer adsorbed on the surface of the surface treatment object is easily removed after the surface treatment process because it has good removability.
- the organic residue is removed by a mechanism different from the case where the surface treatment target contains silicon nitride or silicon oxide. Since polysilicon is hydrophobic, the hydrophobic component tends to adhere to the surface of the surface treatment object due to the hydrophobic interaction. Therefore, the hydrophobic component once removed from the surface of the surface treatment object in the surface treatment process. Component redeposition occurs.
- the hydrophobic structure portion of the sulfonic acid group-containing polymer faces the surface of the surface treatment object, and the anionized sulfonic acid group, which is a hydrophilic structure portion, is opposite to the surface treatment object surface side. By adhering to the (water side), it is adsorbed on the surface of the surface treatment object by hydrophobic interaction.
- the surface treatment object becomes hydrophilic as it is covered with an anionized sulfonic acid group facing away from the surface treatment object surface side (side with water), and the anionized sulfonic acid group Hydrophobic interaction does not occur between the surface of the surface treatment object covered with the surface and the hydrophobic component.
- the hydrophobic component is prevented from reattaching to the surface of the surface treatment object.
- the positively chargeable component as in the case where the surface treatment object contains silicon nitride or silicon oxide, the surface treatment object surface covered with anionized sulfonic acid groups is anionized under acidic conditions.
- the positively chargeable component covered with the sulfonic acid group is electrostatically repelled, so that the positively chargeable component is removed from the surface of the surface treatment object.
- the sulfonic acid group-containing polymer adsorbed on the surface of the surface treatment object is easily removed after the surface treatment process because it has good removability.
- the surface treatment composition according to one embodiment of the present invention is such that the sulfonic acid group-containing polymer is a positively chargeable component under acidic conditions. And functions to remove both hydrophobic components. As a result, the organic residue can be removed very well.
- sulfone A compound having an acid (salt) group is a low molecular compound
- a low molecular compound having a sulfonic acid (salt) group is a surface treatment target surface or a positively chargeable component surface like a sulfonic acid group-containing polymer. This is considered to be because good coverage on the surface, appropriate electrostatic repulsive force for removing organic residue, good removability after the surface treatment step, and the like cannot be obtained.
- the surface treatment composition according to one embodiment of the present invention essentially contains a polymer compound having a sulfonic acid (salt) group.
- a polymer compound having a sulfonic acid (salt) group also referred to herein as a sulfonic acid group-containing polymer contributes to the removal of organic residues by the surface treatment composition.
- sulfonic acid (salt) group means “sulfonic acid group” or “sulfonic acid group”.
- the sulfonic acid group-containing polymer is not particularly limited as long as it has a plurality of sulfonic acid (salt) groups, and a known compound can be used.
- the sulfonic acid group-containing polymer include a polymer compound obtained by sulfonating a base polymer compound, and a polymer obtained by (co) polymerizing a monomer having a sulfonic acid (salt) group. Compounds and the like.
- sulfonic acid group-modified polyvinyl alcohol in this specification, sulfonic acid group-containing polyvinyl alcohol, also referred to as sulfonic acid group-containing modified polyvinyl alcohol
- sulfonic acid group-containing polystyrene such as polystyrene sulfonic acid (in this specification).
- Sulfonic acid group-containing modified polystyrene sulfonic acid group-modified polyvinyl acetate (also referred to herein as sulfonic acid group-containing polyvinyl acetate, sulfonic acid group-containing modified polyvinyl acetate), sulfonic acid group-containing polyester (present)
- sulfonic acid group-containing modified polyester a sulfonic acid group-containing modified polyester
- a (meth) acrylic acid-sulfonic acid group-containing monomer copolymer such as a (meth) acrylic acid-sulfonic acid group-containing monomer copolymer
- At least a part or all of the sulfonic acid groups possessed by these polymers may be in the form of a salt.
- the salt include alkali metal salts such as sodium salt and potassium salt, Group 2 element salts such as calcium salt and magnesium salt, amine salt, ammonium salt and the like.
- sulfonic acid-modified polyvinyl alcohol, sulfonic acid group-containing polystyrene, (meth) acrylic group-containing monomer-sulfonic acid group-containing monomer copolymer or a salt thereof is preferable, and sulfonic acid-modified polyvinyl alcohol, polystyrene.
- a sulfonic acid or a (meth) acrylic acid-sulfonic acid group-containing monomer copolymer or a salt thereof is more preferable, and a sulfonic acid-modified polyvinyl alcohol, polystyrene sulfonic acid or a salt thereof is more preferable, and polystyrene.
- Particularly preferred is sulfonic acid or a salt thereof, and most preferred is p-polystyrenesulfonic acid or a salt thereof.
- the salt of these compounds is particularly preferably a sodium salt.
- the saponification degree is preferably 80% or more, and preferably 85% or more (upper limit 100%) from the viewpoint of solubility.
- the weight average molecular weight of the sulfonic acid group-containing polymer is preferably 1000 or more.
- the weight average molecular weight is 1000 or more, the effect of removing organic residue is further enhanced.
- the coating property when covering the surface treatment object and the positively chargeable component becomes better, the removal of organic residue from the surface treatment object surface or the reattachment of the organic residue on the surface treatment object surface This is presumed to be because the deterrent effect is further improved.
- the weight average molecular weight is more preferably 2000 or more, further preferably 2500 or more, particularly preferably 3000 or more, and most preferably 8000 or more.
- the weight average molecular weight of the sulfonic acid group-containing polymer is preferably 100,000 or less.
- the weight average molecular weight is 100,000 or less, the effect of removing organic residue is further enhanced. This reason is presumed to be because the removability of the sulfonic acid group-containing polymer after the surface treatment step becomes better.
- the weight average molecular weight is more preferably 50000 or less, and further preferably 25000 or less.
- the weight average molecular weight can be measured by gel permeation chromatography (GPC). Details of the method for measuring the weight average molecular weight are described in the Examples.
- sulfonic acid group-containing polymer for example, Goseinex (registered trademark) L-3226, Goseinex (registered trademark) CKS-50, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., manufactured by Toagosei Co., Ltd. Aron (registered trademark) A-6012, A-6016A, A-6020, Polynas (registered trademark) PS-1 manufactured by Tosoh Organic Chemical Co., Ltd., and the like can be used.
- Goseinex (registered trademark) L-3226 Goseinex (registered trademark) CKS-50, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., manufactured by Toagosei Co., Ltd.
- Aron (registered trademark) A-6012, A-6016A, A-6020, Polynas (registered trademark) PS-1 manufactured by Tosoh Organic Chemical Co., Ltd., and the like can be used.
- the sulfonic acid group-containing polymer can be used alone or in combination of two or more.
- the content of the sulfonic acid group-containing polymer is preferably 0.01% by mass or more with respect to the total mass of the surface treatment composition.
- the organic residue removal effect is further improved. This is presumably because the sulfonic acid group-containing polymer is coated in a larger area when coating the surface treatment object and the positively chargeable component. Further, it is presumed that the electrostatic adsorption or repulsion effect can be expressed more strongly by increasing the number of sulfonic acid (salt) groups.
- the content of the sulfonic acid group-containing polymer is preferably 0.05% by mass or more, more preferably 0.09% by mass or more, based on the total mass of the surface treatment composition. preferable. Moreover, it is preferable that content of a sulfonic acid group containing polymer is 10 mass% or less with respect to the total mass of a surface treatment composition. When the content of the sulfonic acid group-containing polymer is 10% by mass or less, the organic residue removal effect is further enhanced. This reason is presumed to be because the removability of the sulfonic acid group-containing polymer after the surface treatment step becomes better. From the same viewpoint, the content of the sulfonic acid group-containing polymer is more preferably 5% by mass or less, and further preferably 1% by mass or less, with respect to the total mass of the surface treatment composition.
- the content of the sulfonic acid group-containing polymer is preferably more than 80% by mass with respect to the total mass of the polymer compound contained in the surface treatment composition (upper limit 100% by mass).
- the organic residue removal effect is further improved. This is because the amount of the polymer compound other than the sulfonic acid group-containing polymer that can cause organic residue after the surface treatment step is reduced.
- the sulfonic acid group-containing polymer coats the surface treatment object and the positively chargeable component, it is reduced that the coating is prevented by a polymer compound other than the sulfonic acid group-containing polymer. Guessed. Furthermore, it is presumed that this is because the electrostatic adsorption effect or repulsion effect exerted by the sulfonic acid group-containing polymer is prevented from being hindered by a polymer compound other than the sulfonic acid group-containing polymer. From the same viewpoint, the content of the sulfonic acid group-containing polymer is more preferably more than 95% by mass with respect to the total mass of the polymer compound contained in the surface treatment composition, and is contained in the surface treatment composition.
- the polymer compound is 100% by mass relative to the total mass of the polymer compound, that is, the polymer compound contained in the surface treatment composition is only a sulfonic acid group-containing polymer.
- the content of the sulfonic acid group-containing polymer is more than 95% by mass with respect to the total mass of the polymer compound contained in the surface treatment composition, the organic residue removal effect is significantly improved.
- examples of the polymer compound other than the sulfonic acid group-containing polymer include polymer compounds used as other additives described later.
- the surface treatment composition according to one embodiment of the present invention preferably further contains an acid.
- the sulfonic acid group-containing polymer is treated as different from the acid as the additive described here.
- the acid is presumed to play a role of charging the surface of the surface treatment object containing silicon nitride or silicon oxide and the surface of the positively chargeable component with a positive charge, and contributes to the removal of organic residue by the surface treatment composition.
- the acid either an inorganic acid or an organic acid may be used.
- the inorganic acid is not particularly limited, and examples thereof include sulfuric acid, nitric acid, boric acid, carbonic acid, hypophosphorous acid, phosphorous acid and phosphoric acid.
- the organic acid is not particularly limited, but 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-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 , Carboxylic acids such as maleic acid, phthalic acid, malic acid, tartaric acid, citric acid and lactic acid, and methanesulfonic acid, ethanesulfonic acid and isethionic acid.
- maleic acid or nitric acid is more preferable and maleic acid is more preferable from the viewpoint that the effect of charging the surface of the surface treatment target object and the surface of the positively chargeable component with a positive charge becomes better. Is more preferable.
- an acid can be used individually or in combination of 2 or more types.
- the acid content is preferably 0.05% by mass or more with respect to the total mass of the surface treatment composition.
- the acid content is preferably 0.1% by mass or more, and more preferably 0.15% by mass or more, based on the total mass of the surface treatment composition.
- content of an acid is 10 mass% or less with respect to the total mass of a surface treatment composition.
- the acid content is more preferably 5% by mass or less, and further preferably 3% by mass or less, with respect to the total mass of the surface treatment composition.
- the surface treatment composition according to one embodiment of the present invention preferably contains substantially no phosphonic acid or a compound having a phosphonic acid group having a molecular weight of less than 1000 as an acid. Moreover, it is preferable that these salts are not substantially contained. That is, the surface treatment composition according to one embodiment of the present invention preferably does not substantially contain phosphonic acid, a compound having a phosphonic acid group having a molecular weight of less than 1000, or a salt thereof.
- phosphonic acid a compound having a phosphonic acid group having a molecular weight of less than 1000 or a salt thereof
- phosphonic acid relative to the total mass of the surface treatment composition phosphonic acid having a molecular weight of less than 1000”.
- the surface treatment composition according to one embodiment of the present invention may contain abrasive grains, but from the viewpoint of further improving the defect removal effect, the surface treatment composition according to one embodiment of the present invention contains abrasive grains. It is preferable not to contain substantially.
- substantially free of abrasive grains refers to a case where the content of abrasive grains is 0.01% by mass or less with respect to the total mass of the surface treatment composition.
- the surface treatment composition according to an embodiment of the present invention may contain other additives in any proportion as necessary within a range not inhibiting the effects of the present invention.
- components other than the essential components of the surface treatment composition according to one embodiment of the present invention may cause defects, it is desirable not to add them as much as possible. Therefore, the addition amount is preferably as small as possible and not included. Is more preferable.
- other additives include alkalis, preservatives, dissolved gases, reducing agents, oxidizing agents, and alkanolamines.
- the surface treatment composition according to one embodiment of the present invention essentially contains water as a dispersion medium (solvent).
- the dispersion medium has a function of dispersing or dissolving each component. More preferably, the dispersion medium is only water.
- the dispersion medium may be a mixed solvent of water and an organic solvent for dispersing or dissolving each component.
- examples of the organic solvent used include acetone, acetonitrile, ethanol, methanol, isopropanol, glycerin, ethylene glycol, propylene glycol and the like, which are organic solvents miscible with water.
- these organic solvents may be used without being mixed with water, and each component may be dispersed or dissolved and then mixed with water. These organic solvents can be used alone or in combination of two or more.
- the water is preferably water containing as little impurities as possible from the viewpoint of inhibiting the contamination of the surface treatment target and the action of other components.
- water having a total content of transition metal ions of 100 ppb or less is preferable.
- the purity of water can be increased by operations such as removal of impurity ions using an ion exchange resin, removal of foreign matters by a filter, distillation, and the like.
- deionized water ion exchange water
- pure water ultrapure water, distilled water, or the like is preferably used as the water.
- the pH value of the surface treatment composition according to an embodiment of the present invention is less than 7.
- the pH value is 7 or more, the effect of charging the surface of the surface treatment object or the surface of the positively chargeable component with a positive charge cannot be obtained, and a sufficient organic residue removal effect cannot be obtained.
- the pH value is more preferably less than 4, more preferably less than 3, and particularly preferably 2.5 or less.
- the pH value is preferably 1 or more. When the pH value is 1 or more, damage to the device due to low pH can be further reduced.
- the pH value of the surface treatment composition can be confirmed with a pH meter (manufactured by Horiba, Ltd., model number: LAQUA).
- the pH value When adjusting the pH value, it is desirable not to add components other than the essential components of the surface treatment composition according to an embodiment of the present invention as much as possible because they may cause defects. From this, it is preferable to adjust only with an acid or sulfonic acid group-containing polymer that can be optionally contained. However, if it is difficult to obtain a desired pH value only by these, it may be prepared using other additives such as alkali that can be optionally added within a range not inhibiting the effect of the present invention. .
- Another embodiment of the present invention is a method for producing the above-described surface treatment composition, which comprises mixing a polymer compound having a sulfonic acid (salt) group and water.
- the above-described abrasive grains, other additives, a dispersion medium other than water, and the like may be further mixed.
- the mixing method such as the mixing conditions and the mixing order is not particularly limited, and known ones can be used.
- a surface treatment is performed on the surface of a polished polishing object (surface treatment object) using the surface treatment composition to reduce organic residue on the surface of the polished polishing object.
- the surface treatment method refers to a method of reducing organic residue on the surface of a surface treatment object, and is a method of performing cleaning in a broad sense.
- the remaining organic residue can be sufficiently removed. That is, according to another aspect of the present invention, there is provided a method for reducing organic matter residue on the surface of a surface treatment object, wherein the surface treatment object is surface-treated using the surface treatment composition.
- the surface treatment method according to an embodiment of the present invention is performed by a method in which the surface treatment composition according to the present invention is brought into direct contact with the surface treatment object.
- the surface treatment method mainly, (I) a method by rinsing and (II) a method by cleaning treatment may be mentioned. That is, the surface treatment according to one embodiment of the present invention is preferably performed by a rinse polishing process or a cleaning process, and more preferably by a cleaning process. The rinse polishing process and the cleaning process are performed in order to remove defects on the surface of the surface treatment target object and obtain a clean surface.
- the above (I) and (II) will be described below.
- the surface treatment composition according to one embodiment of the present invention is suitably used in a rinse polishing treatment. That is, the surface treatment composition according to one embodiment of the present invention can be preferably used as a rinse polishing composition.
- the polished object to be polished After the final polishing (finish polishing) is performed on the object to be polished, the polished object to be polished (the surface object to be processed and the surface object to be rinsed when performing the rinsing polishing process as the surface treatment)
- the polished object to be polished For the purpose of removing defects on the surface of the polishing plate, it is performed on a polishing platen (platen) to which a polishing pad is attached.
- the rinsing polishing treatment is performed by bringing the rinsing polishing composition into direct contact with the rinsing polishing surface treatment object.
- defects on the surface of the rinsing polishing surface treatment target object are removed by frictional force (physical action) caused by the polishing pad and chemical action caused by the rinsing polishing composition.
- particles and organic residue are easily removed by physical action. Therefore, in the rinsing polishing process, particles and organic residue can be effectively removed by utilizing friction with the polishing pad on the polishing surface plate (platen).
- the rinsing polishing process, the rinsing method, and the rinsing process refer to processes, methods, and processes that reduce defects on the surface of the object to be rinsed using a polishing pad, respectively.
- the surface of the rinsing polishing surface treatment object after the polishing step is placed on a polishing surface plate (platen) of a polishing apparatus, and the polishing pad and the rinsing polishing surface treatment object are brought into contact with each other,
- the rinsing polishing surface treatment object and the polishing pad can be slid relative to each other while the rinsing polishing composition is supplied to the contact portion.
- the rinse polishing treatment can be performed using either a single-side polishing apparatus or a double-side polishing apparatus.
- the polishing apparatus preferably includes a discharge nozzle for a rinsing composition in addition to a discharge nozzle for a polishing composition.
- the operating conditions during the rinsing process of the polishing apparatus are not particularly limited, and can be set as appropriate by those skilled in the art.
- the surface treatment composition according to one embodiment of the present invention is suitably used in the cleaning treatment. That is, the surface treatment composition according to one embodiment of the present invention can be preferably used as a cleaning composition.
- the cleaning treatment was performed after final polishing (finish polishing) on the object to be polished, or a rinse polishing treatment as the surface treatment or a rinse polishing composition other than the surface treatment composition of the present invention described later. After the other rinse polishing treatment is performed, it is performed for the purpose of removing foreign matters on the surface of the polished polishing object (surface treatment object, also referred to as a cleaning object when performing the cleaning process). Even in the case of surface treatment, the cleaning treatment and the rinsing polishing treatment as the surface treatment are classified according to the place where these treatments are performed, and the cleaning treatment is performed on the polishing platen (platen). Surface treatment performed after removal.
- the cleaning process, the cleaning method, and the cleaning process refer to a process, a method, and a process that reduce defects on the surface of an object to be cleaned without using a polishing pad, respectively.
- the cleaning method according to an aspect of the present invention is performed by a method in which the cleaning composition according to an aspect of the present invention is brought into direct contact with an object to be cleaned.
- the contact method of the cleaning composition to the object to be cleaned is a dip type in which the cleaning tank is filled with the cleaning composition and the object to be cleaned is immersed, and the object to be cleaned is supplied while flowing the cleaning composition from the nozzle onto the object to be cleaned.
- Examples thereof include a spin type that rotates an object at a high speed and a spray type that sprays a liquid on an object to be cleaned for cleaning.
- a method and a process for performing ultrasonic treatment by immersing the object to be cleaned in the cleaning composition (i) a method and a process for performing ultrasonic treatment by immersing the object to be cleaned in the cleaning composition, and (ii) holding the object to be cleaned
- a method and a process are known in which the cleaning brush is brought into contact with one or both surfaces of the object to be cleaned, and the surface of the object to be cleaned is rubbed with the brush while supplying the cleaning composition to the contact part.
- defects on the surface of the object to be cleaned are removed by mechanical force generated by ultrasonic waves or frictional force by the cleaning brush and chemical action by the cleaning composition.
- a method and a process for performing the cleaning treatment according to an embodiment of the present invention are not particularly limited, but are a method and a process including a spin-type or spray-type contact method from the viewpoint of more efficient decontamination in a short time. It is preferable that the method and process include a spin contact method. Among these, a method and a process including a spin contact method using a polishing apparatus and a cleaning brush are more preferable.
- a batch-type cleaning apparatus that simultaneously cleans a plurality of cleaning objects accommodated in a cassette, a sheet that is mounted on a holder and cleaned There are leaf-type cleaning devices.
- a cleaning method using a single wafer cleaning device as a device for performing the cleaning process is preferable from the viewpoint of shortening the cleaning time and reducing the amount of cleaning liquid used.
- an apparatus for performing the cleaning process there is a polishing apparatus equipped with a cleaning facility for removing the object to be cleaned from the polishing platen (platen) and then rubbing the object to be cleaned with a cleaning brush.
- a polishing apparatus equipped with a cleaning facility for removing the object to be cleaned from the polishing platen (platen) and then rubbing the object to be cleaned with a cleaning brush.
- polishing apparatus a general polishing apparatus having a polishing surface plate or a cleaning brush to which a cleaning brush can be attached is used. be able to.
- polishing apparatus either a single-side polishing apparatus or a double-side polishing apparatus may be used.
- MirrorMesa manufactured by Applied Materials can be preferably used as the polishing apparatus. Note that it is more efficient and preferable that the cleaning process is performed using a polishing apparatus used in the CMP process, or an apparatus similar to the polishing apparatus used in the rinsing process when an optional rinsing process is provided.
- the cleaning brush is not particularly limited, but it is preferable to use a resin brush.
- the material of the resin brush is not particularly limited, but for example, PVA (polyvinyl alcohol) is preferably used. And as a washing brush, it is especially preferable to use the sponge made from PVA.
- the cleaning conditions are not particularly limited, and can be set as appropriate according to the type of the object to be cleaned and the type and amount of the organic residue to be removed.
- the rotation speed of the cleaning brush is preferably 10 rpm or more and 200 rpm or less
- the rotation speed of the object to be cleaned is 10 rpm or more and 100 rpm or less
- the pressure (polishing pressure) applied to the object to be cleaned is preferably 0.5 psi or more and 10 psi or less.
- the method of supplying the cleaning composition to the polishing pad is not particularly limited, and for example, a method of continuously supplying with a pump or the like (flowing) is adopted.
- the surface of a cleaning brush and a cleaning target object is always covered with the cleaning composition which concerns on one form of this invention, and it is 10 mL / min or more and 5000 mL / min or less. Is preferred.
- the cleaning time is not particularly limited, the process using the cleaning composition according to one embodiment of the present invention is preferably 5 seconds or more and 180 seconds or less. If it is such a range, it is possible to remove an organic residue more favorably.
- the temperature of the cleaning composition at the time of cleaning is not particularly limited and may usually be room temperature, but may be heated to about 40 ° C. or more and 70 ° C. or less as long as the performance is not impaired.
- the object to be cleaned is one that has been subjected to a rinse polishing treatment as the surface treatment or another rinse polishing treatment using a rinse polishing composition other than the surface treatment composition of the present invention described later. It is preferable.
- Rinsing with water may be performed before, after, or both of the surface treatment method according to an embodiment of the present invention, for example, the surface treatment by the methods (I) and (II).
- the surface treatment target after the surface treatment is dried by removing water droplets adhering to the surface with a spin dryer or the like. Moreover, you may dry the surface of a surface treatment target object by air blow drying.
- the surface treatment composition according to one embodiment of the present invention is more preferable as the effect of removing the organic residue on the surface of the surface treatment object is higher. That is, when the surface treatment of the organic residue is performed using the surface treatment composition, the smaller the number of organic residues remaining on the surface, the better.
- the number of organic residues after the surface treatment of the surface treatment object using the surface treatment composition is preferably 260 or less. 150 or less, more preferably 80 or less, even more preferably 25 or less, even more preferably 15 or less, and most preferably 12 or less. Preferred (lower limit 0).
- the polished polishing object is a polished semiconductor substrate, and an organic residue on the surface of the polished semiconductor substrate by the surface treatment method according to an embodiment of the present invention.
- This is a method for manufacturing a semiconductor substrate, including a surface treatment step for reducing the above.
- the manufacturing method according to an embodiment of the present invention is not particularly limited as long as it includes a surface treatment step for reducing organic residue on the surface of the polished semiconductor substrate.
- polishing for forming a polished semiconductor substrate is performed.
- cleaning process is mentioned.
- a step of rinsing polishing as the surface treatment for reducing defects on the surface of the polished semiconductor substrate between the polishing step and the cleaning step (rinse) And a method having a polishing step).
- polishing process In the polishing step that can be included in the method for manufacturing a semiconductor substrate according to one embodiment of the present invention, a semiconductor substrate containing silicon nitride, silicon oxide, or polysilicon is polished to form a polished semiconductor substrate (surface treatment object). It is a process.
- the polishing step is not particularly limited as long as it is a step for polishing a semiconductor substrate, but is preferably a chemical mechanical polishing (CMP) step.
- the polishing step may be a polishing step consisting of a single step or a polishing step consisting of a plurality of steps.
- a polishing process consisting of a plurality of processes for example, a process of performing a final polishing process after a preliminary polishing process (rough polishing process), a secondary polishing process of one or more times after a primary polishing process, The process etc. which perform a final polishing process after that are mentioned.
- polishing composition a known polishing composition can be appropriately used according to the characteristics of the semiconductor substrate. Although it does not restrict
- a polishing apparatus As a polishing apparatus, a general polishing apparatus having a polishing surface plate on which a holder for holding an object to be polished and a motor capable of changing the number of rotations is attached and a polishing pad (polishing cloth) can be attached is used. can do.
- the polishing apparatus either a single-side polishing apparatus or a double-side polishing apparatus may be used. Specifically, for example, MirrorMesa manufactured by Applied Materials can be preferably used as the polishing apparatus.
- polishing pad a general nonwoven fabric, polyurethane, porous fluororesin, or the like can be used without particular limitation. It is preferable that the polishing pad is grooved so that the polishing liquid accumulates. It is preferable that the polishing pad is grooved so that the polishing composition accumulates. Specifically, for example, a hard polyurethane pad IC1000 manufactured by Nitta Haas Co., Ltd. can be preferably used as the polishing pad.
- the polishing conditions are not particularly limited.
- the rotation speed of the polishing platen and the rotation speed of the head (carrier) are preferably 10 rpm or more and 100 rpm or less, and the pressure applied to the object to be polished (polishing pressure) is 0.5 psi or more and 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 (pouring) with a pump or the like is employed. Although there is no restriction
- the polishing time is not particularly limited, it is preferably 5 seconds or more and 180 seconds or less for the step using the polishing composition.
- a manufacturing method of a semiconductor substrate according to an embodiment of the present invention includes a step of performing a rinsing process using a rinsing composition other than the surface treatment composition according to the present invention (in this specification, simply “other rinsing process”). It may also be referred to as a “process”.
- the other rinse polishing step is preferably provided between the polishing step and the surface treatment step in the method for manufacturing a semiconductor substrate according to one embodiment of the present invention.
- the surface of the semiconductor substrate containing silicon nitride, silicon oxide or polysilicon after the polishing step is placed on a polishing platen (platen) of the polishing apparatus, and the polishing pad and the polished semiconductor substrate are brought into contact with each other.
- the rinse polishing composition other than the surface treatment composition according to the present invention a known rinse polishing composition is appropriately used depending on the type of the polished semiconductor substrate and the type and amount of the defect to be removed. be able to.
- the rinse polishing composition other than the surface treatment composition according to the present invention is not particularly limited.
- a composition containing a water-soluble polymer, a dispersion medium and an acid can be preferably used.
- Specific examples of the rinse polishing composition include a rinse polishing composition containing polyvinyl alcohol, water and nitric acid.
- a rinse polishing composition other than the surface treatment composition according to the present invention is supplied instead of supplying the polishing composition.
- the same apparatus and conditions as those in the polishing step can be applied.
- the surface treatment step is a step of reducing organic residue on the surface of the polished semiconductor substrate by the surface treatment method according to one embodiment of the present invention.
- a step of performing the rinse treatment as the surface treatment for example, a step of performing the rinse treatment as the surface treatment (rinse polishing step), a step of performing the cleaning treatment (cleaning step), and the like can be mentioned.
- ⁇ Preparation of surface treatment composition (cleaning composition)> 0.5 parts by weight of a maleic acid aqueous solution having a concentration of 30% by weight as an organic acid, sulfonic acid-modified polyvinyl alcohol (PVA) (salt: sodium salt), weight average molecular weight 9,000) (Gocenex (registered trademark) L-3226, A cleaning composition A-1 was prepared by mixing 0.1 part by mass of Nippon Synthetic Chemical Industry Co., Ltd. and 99.8 parts by mass of water (deionized water). The pH value of the cleaning composition A-1 (liquid temperature: 25 ° C.) was confirmed by using a pH meter (model number: LAQUAA manufactured by Horiba, Ltd.), and the pH value was 2.
- cleaning compositions A-2 to A-5 and C-1 to C-10 Each cleaning composition was prepared in the same manner as the preparation of the cleaning composition A-1, except that the sulfonic acid-modified PVA was changed to the types of additives shown in Tables 1 to 3 below. In the table, “-” indicates that the corresponding component was not used.
- the pH values of the cleaning compositions are also shown in Tables 1 to 3 below.
- GPC device manufactured by Shimadzu Corporation Model: Prominence + ELSD detector (ELSD-LTII) Column: VP-ODS (manufactured by Shimadzu Corporation) Mobile phase A: MeOH B: 1% aqueous solution of acetic acid Flow rate: 1 mL / min Detector: ELSD temp. 40 ° C., Gain 8, N 2 GAS 350 kPa Oven temperature: 40 ° C Injection volume: 40 ⁇ L.
- Polishing after the polished silicon nitride substrate, polished TEOS substrate and polished polysilicon substrate are further processed by the following other rinsing steps after being polished by the following chemical mechanical polishing (CMP) step
- CMP chemical mechanical polishing
- polishing composition M composition: sulfonic acid-modified colloidal silica (“Sulphonic acid-functionalized silicon oxidative of thioid of oxide group”), Chem. 247 (2003), primary particle diameter 30 nm, secondary particle diameter 60 nm) 4 mass%, ammonium sulfate 1 mass%, concentration 30 mass% maleic acid aqueous solution 0.018 mass%, solvent: water
- sulfonic acid-modified colloidal silica (“Sulphonic acid-functionalized silicon oxidative of thioid of oxide group”)
- Chem. 247 (2003) primary particle diameter 30 nm, secondary particle diameter 60 nm
- ammonium sulfate 1 mass% concentration 30 mass% maleic acid aqueous solution 0.018 mass%
- solvent: water solvent: water
- a rinse polishing composition R composition other than the surface treatment composition according to the present invention
- 0.1% by mass of polyvinyl alcohol weight average molecular weight 10,000
- Polishing device MirrorMesa manufactured by Applied Materials Polishing pad: Hard polyurethane pad IC1010 manufactured by Nitta Haas Co., Ltd. Polishing pressure: 1.0 psi Polishing platen rotation speed: 60rpm Head rotation speed: 60rpm Polishing composition supply: pouring Polishing composition supply amount: 100 mL / min Polishing time: 60 seconds.
- ⁇ Washing process> A cleaning method for rubbing each polished polishing object under the following conditions while applying pressure with a polyvinyl alcohol (PVA) sponge, which is a cleaning brush, using each of the prepared cleaning compositions or water (deionized water)
- PVA polyvinyl alcohol
- Each polished polishing object was cleaned by (Cleaning equipment and cleaning conditions) Device: MiraMesa manufactured by Applied Materials Cleaning brush rotation speed: 100rpm Cleaning target (polished polishing target) rotation speed: 50 rpm Flow rate of cleaning liquid: 1000 mL / min Cleaning time: 60 seconds.
- the cleaning composition according to an aspect of the present invention has a remarkable organic residue on the surface of a polished object to be polished containing silicon nitride. It was confirmed that the reduction effect was excellent.
- the cleaning composition according to an embodiment of the present invention has a reduction effect of organic residue on the surface of the polished polishing object, as well as other rinse polishing steps as compared with the case of using deionized water. It was confirmed that the organic substance residue reducing effect was significantly superior even when compared with the (known rinse polishing step).
- a method that does not provide another rinse polishing process (known rinse polishing process) is employed as a method for manufacturing a semiconductor substrate.
- a method that focuses on removing other than organic residue can be employed as another rinse polishing step, etc. It is possible to increase the degree of design freedom of the manufacturing method aiming at further reducing the defects of the completed semiconductor substrate.
- the surface treatment composition which concerns on one form of this invention shows the reduction effect of the organic substance outstanding also when the rinse polishing process is performed as a rinse polishing composition.
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Abstract
Description
窒化珪素、酸化珪素またはポリシリコンを含む研磨済研磨対象物の表面における有機物残渣を低減するのに用いられる、
表面処理組成物。
上記7または8に記載の表面処理方法によって、研磨済半導体基板の表面における有機物残渣を低減する表面処理工程を含む、半導体基板の製造方法。
本明細書において、有機物残渣とは、表面処理対象物表面に付着したディフェクトのうち、有機低分子化合物や高分子化合物等の有機物や有機塩等からなる成分を表す。
本明細書において、研磨済研磨対象物とは、研磨工程において研磨された後の研磨対象物を意味する。研磨工程としては、特に制限されないが、CMP工程であることが好ましい。
本発明の一形態は、スルホン酸(塩)基を有する高分子化合物(スルホン酸基含有高分子)と、水と、を含有し、pH値が7未満である、窒化珪素、酸化珪素またはポリシリコンを含む研磨済研磨対象物の表面における有機物残渣を低減するのに用いられる、表面処理組成物である。本形態に係る表面処理組成物によれば、窒化珪素、酸化珪素またはポリシリコンを含む研磨済研磨対象物の表面に残留する有機物残渣を十分に除去させうる手段が提供されうる。
表面処理による有機物残渣除去のメカニズムは以下のように推定される。
表面処理による有機物残渣除去のメカニズムは以下のように推定される。
本発明の一形態に係る表面処理組成物は、スルホン酸(塩)基を有する高分子化合物を必須に含む。スルホン酸(塩)基を有する高分子化合物(本明細書では、スルホン酸基含有高分子とも称する)は、表面処理組成物による有機物残渣の除去に寄与する。なお、本明細書において、「スルホン酸(塩)基」とは、「スルホン酸基」または「スルホン酸塩基」を表す。
本発明の一形態に係る表面処理組成物は、酸をさらに含むことが好ましい。なお、本明細書において、スルホン酸基含有高分子はここで述べる添加剤としての酸とは異なるものとして取り扱う。酸は、窒化珪素または酸化珪素を含む表面処理対象物の表面および正電荷帯電性成分の表面を正電荷で帯電させる役割を担うと推測され、表面処理組成物による有機物残渣の除去に寄与する。
本発明の一形態に係る表面処理組成物は、砥粒を含んでいてもよいが、ディフェクト除去効果のさらなる向上との観点から、本発明の一形態に係る表面処理組成物は、砥粒を実質的に含有しないことが好ましい。ここで、「砥粒を実質的に含有しない」とは、表面処理組成物の総質量に対する砥粒の含有量が0.01質量%以下である場合をいう。
本発明の一形態に係る表面処理組成物は、本発明の効果を阻害しない範囲内において、必要に応じて、他の添加剤を任意の割合で含有していてもよい。ただし、本発明の一形態に係る表面処理組成物の必須成分以外の成分は、ディフェクトの原因となりうるためできる限り添加しないことが望ましいため、その添加量はできる限り少ないことが好ましく、含まないことがより好ましい。他の添加剤としては、例えば、アルカリ、防腐剤、溶存ガス、還元剤、酸化剤およびアルカノールアミン類等が挙げられる。
本発明の一形態に係る表面処理組成物は、分散媒(溶媒)として水を必須に含む。分散媒は、各成分を分散または溶解させる機能を有する。分散媒は、水のみであることがより好ましい。また、分散媒は、各成分の分散または溶解のために、水と有機溶媒との混合溶媒であってもよい。この場合、用いられる有機溶媒としては、水と混和する有機溶媒であるアセトン、アセトニトリル、エタノール、メタノール、イソプロパノール、グリセリン、エチレングリコール、プロピレングリコール等が挙げられる。また、これらの有機溶媒を水と混合せずに用いて、各成分を分散または溶解した後に、水と混合してもよい。これら有機溶媒は、単独でもまたは2種以上組み合わせても用いることができる。
本発明の一形態に係る表面処理組成物のpH値は、7未満であることを必須とする。pH値が7以上であると、表面処理対象物の表面または正電荷帯電性成分の表面を正電荷で帯電させる効果が得られず、十分な有機物残渣の除去効果を得られない。同様の観点から、pH値が4未満であることがより好ましく、3未満であることがさらに好ましく、2.5以下であることが特に好ましい。また、pH値は、1以上であることが好ましい。pH値が1以上であると、低pH起因の装置へのダメージをより減らすことができる。
本発明の他の一形態は、スルホン酸(塩)基を有する高分子化合物と、水と、を混合することを含む、上記の表面処理組成物の製造方法である。本発明の一形態に係る表面処理組成物の製造方法においては、上記した砥粒、他の添加剤または水以外の分散媒等をさらに混合してもよい。これらの混合条件、混合順序等の混合方法は、特に制限されず、公知のものを用いることができる。
本発明のその他の一形態は、上記表面処理組成物を用いて研磨済研磨対象物(表面処理対象物)を表面処理して、研磨済研磨対象物の表面における有機物残渣を低減する、表面処理方法である。本明細書において、表面処理方法とは、表面処理対象物の表面における有機物残渣を低減する方法をいい、広義の洗浄を行う方法である。
本発明の一形態に係る表面処理組成物は、リンス研磨処理において好適に用いられる。すなわち、本発明の一形態に係る表面処理組成物は、リンス研磨用組成物として好ましく用いることができる。リンス研磨処理は、研磨対象物について最終研磨(仕上げ研磨)を行った後、研磨済研磨対象物(表面処理対象物、表面処理としてのリンス研磨処理を行う際にはリンス研磨表面処理対象物とも称する)の表面上のディフェクトの除去を目的として、研磨パッドが取り付けられた研磨定盤(プラテン)上で行われる。このとき、リンス研磨用組成物をリンス研磨表面処理対象物に直接接触させることにより、リンス研磨処理が行われる。その結果、リンス研磨表面処理対象物表面のディフェクトは、研磨パッドによる摩擦力(物理的作用)およびリンス研磨用組成物による化学的作用によって除去される。ディフェクトのなかでも、特にパーティクルや有機物残渣は、物理的な作用により除去されやすい。したがって、リンス研磨処理では、研磨定盤(プラテン)上で研磨パッドとの摩擦を利用することで、パーティクルや有機物残渣を効果的に除去することができる。
本発明の一形態に係る表面処理組成物は、洗浄処理において好適に用いられる。すなわち、本発明の一形態に係る表面処理組成物は、洗浄用組成物として好ましく用いることができる。洗浄処理は、研磨対象物について最終研磨(仕上げ研磨)を行った後、または、上記表面処理としてのリンス研磨処理、または後述の本発明の表面処理組成物以外のリンス研磨用組成物を用いた他のリンス研磨処理を行った後、研磨済研磨対象物(表面処理対象物、洗浄処理を行う際には洗浄対象物とも称する)の表面上の異物の除去を目的として行われる。なお、表面処理であっても、洗浄処理と、上記表面処理としてのリンス研磨処理とは、これらの処理を行う場所によって分類され、洗浄処理は、洗浄対象物を研磨定盤(プラテン)上から取り外した後に行われる表面処理である。
本発明の一形態に係る表面処理組成物は、表面処理対象物の表面上の有機物残渣を除去する効果が高いほど好ましい。すなわち、表面処理組成物を用いて有機物残渣の表面処理を行った際、表面に残存する有機物残渣の数が少ないほど好ましい。具体的には、表面処理組成物を用いて表面処理対象物を表面処理した後(その後に水による洗浄または乾燥を行う場合はその後)の有機物残渣の数が、260個以下であることが好ましく、150個以下であることがより好ましく、80個以下であることがさらに好ましく、25個以下であることがよりさらに好ましく、15個以下であることが特に好ましく、12個以下であることが最も好ましい(下限0個)。
本発明のさらなる他の一形態は、研磨済研磨対象物(表面処理対象物)が研磨済半導体基板であり、本発明の一形態に係る表面処理方法によって、研磨済半導体基板の表面における有機物残渣を低減する表面処理工程を含む、半導体基板の製造方法である。
本発明の一形態に係る半導体基板の製造方法に含まれうる研磨工程は、窒化珪素、酸化珪素またはポリシリコンを含む半導体基板を研磨して、研磨済半導体基板(表面処理対象物)を形成する工程である。
本発明の一形態に係る半導体基板の製造方法は、本発明に係る表面処理組成物以外のリンス研磨用組成物を用いたリンス研磨処理を行う工程(本明細書では、単に「他のリンス研磨工程」とも称する。)を含んでいてもよい。他のリンス研磨工程は、本発明の一形態に係る半導体基板の製造方法において、研磨工程および表面処理工程の間に設けられることが好ましい。他のリンス研磨工程は、研磨工程後の窒化珪素、酸化珪素またはポリシリコンを含む半導体基板表面を研磨装置の研磨定盤(プラテン)に設置し、研磨パッドと研磨済半導体基板とを接触させて、その接触部分に本発明に係る表面処理組成物以外のリンス研磨用組成物を供給しながら研磨済半導体基板と研磨パッドとを相対摺動させる工程である。その結果、研磨済研磨対象物表面のディフェクトは、研磨パッドによる摩擦力およびリンス研磨用組成物による化学的作用によって除去される。
表面処理工程は、本発明の一形態に係る表面処理方法によって、研磨済半導体基板の表面における有機物残渣を低減する工程である。
[洗浄用組成物A-1の調製]
有機酸としての濃度30質量%マレイン酸水溶液を0.5質量部、スルホン酸変性ポリビニルアルコール(PVA)(塩:ナトリウム塩)、重量平均分子量9,000)(ゴーセネックス(登録商標)L-3226、日本合成化学工業株式会社製)を0.1質量部、および水(脱イオン水)99.8質量部を混合することにより、洗浄用組成物A-1を調製した。洗浄用組成物A-1(液温:25℃)のpH値をpHメータ(株式会社堀場製作所製 型番:LAQUA)により確認したところ、pH値は2であった。
スルホン酸変性PVAを、下記表1~3に示す種類の各添加剤に変更した以外は、洗浄用組成物A-1の調整と同様に操作して、各洗浄用組成物を調製した。なお、表中の「-」は該当する成分を用いなかったことを示す。また、各洗浄用組成物のpH値を併せて下記表1~3に示す。
・C-1に使用:アセトアセチル変性PVA(日本合成化学工業株式会社製 ゴーセネックス(登録商法)Z100)
・C-2に使用:ポリアクリレート(ビックケミー社製 DISPERBYK(登録商標)-194N)
・C-3に使用:カルボン酸変性PVA(日本合成化学工業株式会社製 ゴーセネックス(登録商標)T330)
・C-4に使用:エチレンオキサイド変性PVA(日本合成化学工業株式会社製 ゴーセネックス(登録商標)WO320N)
・C-5に使用:4級アンモニウム塩を側鎖に有する変性PVA(日本合成化学工業株式会社製 ゴーセネックス(登録商標)K-434)
・C-6に使用:ポリアクリル酸ナトリウム(東亞合成株式会社製 アロン(登録商標)A-210)
・C-7に使用:ポリアクリル酸アンモニウム塩(東亞合成株式会社製 アロン(登録商標)A-30SL)
・A-3に使用:アクリル酸-スルホン酸基含有モノマーの共重合体(塩:ナトリウム塩)、重量平均分子量10,000)(東亞合成株式会社製 アロン(登録商標)A-6020)
・A-4に使用:アクリル酸-スルホン酸基含有モノマーの共重合体(塩:ナトリウム塩)、重量平均分子量2,000)(東亞合成株式会社製 アロン(登録商標)A-6016A)
・C-8に使用:リン酸エステル(ビックケミー社製 DISPERBYK(登録商標)-180)
・C-9に使用:アクリレートコポリマー(ビックケミー社製 DISPERBYK(登録商標)-2015)
・A-5に使用:ポリスチレンスルホン酸ナトリウム(東ソー有機化学株式会社製 ポリナス(登録商標)PS-1)
・C-10に使用:ドデシルベンゼンスルホン酸ナトリウム(東京化成工業株式会社製 ドデシルベンゼンスルホン酸ナトリウム)。
なお、リン酸エステル以外の添加剤の重量平均分子量は、ゲルパーミーエーションクロマトグラフィー(GPC)によって測定した重量平均分子量(ポリエチレングリコール換算)の値を用いた。重量平均分子量は、下記の装置および条件によって測定した。
型式:Prominence + ELSD検出器(ELSD-LTII)
カラム:VP-ODS(株式会社島津製作所製)
移動相 A:MeOH
B:酢酸1%水溶液
流量:1mL/分
検出器:ELSD temp.40℃、Gain 8、N2GAS 350kPa
オーブン温度:40℃
注入量:40μL。
下記化学的機械的研磨(CMP)工程によって研磨された後の、研磨済窒化珪素基板、研磨済TEOS基板および研磨済ポリシリコン基板を、さらに下記の他のリンス工程によってさらに処理された後の研磨済窒化珪素基板、研磨済TEOS基板および研磨済ポリシリコン基板を、それぞれ研磨済研磨対象物として準備した。
半導体基板である窒化珪素基板、TEOS基板およびポリシリコン基板について、研磨用組成物M(組成;スルホン酸修飾コロイダルシリカ(“Sulfonic acid-functionalized silica through quantitative oxidation of thiol groups”,Chem.Commun.246-247(2003)に記載の方法で作製、一次粒子径30nm、二次粒子径60nm)4質量%、硫酸アンモニウム1質量%、濃度30質量%のマレイン酸水溶液0.018質量%、溶媒:水)を使用し、それぞれ下記の条件にて研磨を行った。ここで、窒化珪素基板、TEOS基板およびポリシリコン基板は、200mmウエハを使用した。
研磨装置:アプライドマテリアルズ社製 MirraMesa
研磨パッド:ニッタ・ハース株式会社製 硬質ポリウレタンパッド IC1010
研磨圧力:2.0psi(1psi=6894.76Pa、以下同様)
研磨定盤回転数:60rpm
ヘッド回転数:60rpm
研磨用組成物の供給:掛け流し
研磨用組成物供給量:100mL/分
研磨時間:60秒間。
必要に応じて、前記CMP工程によって研磨された後の研磨済窒化珪素基板、研磨済TEOS基板および研磨済ポリシリコン基板について、本発明に係る表面処理組成物以外のリンス研磨用組成物R(組成;ポリビニルアルコール(重量平均分子量10,000)0.1質量%、溶媒;水、硝酸でpH=2に調整)を使用し、下記の条件でリンス研磨を行った。
研磨装置:アプライドマテリアルズ社製 MirraMesa
研磨パッド:ニッタ・ハース株式会社製 硬質ポリウレタンパッド IC1010
研磨圧力:1.0psi
研磨定盤回転数:60rpm
ヘッド回転数:60rpm
研磨用組成物の供給:掛け流し
研磨用組成物供給量:100mL/分
研磨時間:60秒間。
前記調製した各洗浄用組成物または水(脱イオン水)を用いて、洗浄ブラシであるポリビニルアルコール(PVA)製スポンジで圧力をかけながら下記条件で各研磨済研磨対象物をこする洗浄処理方法によって、各研磨済研磨対象物を洗浄した。
(洗浄装置および洗浄条件)
装置:アプライドマテリアルズ社製 MirraMesa
洗浄ブラシ回転数:100rpm
洗浄対象物(研磨済研磨対象物)回転数:50rpm
洗浄液の流量:1000mL/分
洗浄時間:60秒間。
上記洗浄工程によって洗浄された後の各研磨済研磨対象物について、下記項目について測定し評価を行った。評価結果を表1に合わせて示す。
各洗浄用組成物を用いて、上記に示す洗浄条件で研磨済研磨対象物を洗浄した後の、0.10μm以上のディフェクト数を測定した。ディフェクト数の測定にはKLA TENCOR社製SP-2を使用した。測定は、研磨済研磨対象物の片面の外周端部から幅5mmの部分を除外した残りの部分について測定を行った。
各洗浄用組成物を用いて、上記に示す洗浄条件で研磨済研磨対象物を洗浄した後の、有機物残渣の数を、株式会社日立製作所製Review SEM RS6000を使用し、SEM観察によって測定した。まず、SEM観察にて、研磨済研磨対象物の片面の外周端部から幅5mmの部分を除外した残りの部分に存在するディフェクトを100個サンプリングした。次いで、サンプリングした100個のディフェクトの中からSEM観察にて目視にて有機物残渣を判別し、その個数を確認することで、ディフェクト中の有機物残渣の割合(%)を算出した。そして、上述のディフェクト数の評価にてKLA TENCOR社製SP-2を用いて測定した0.10μm以上のディフェクト数(個)と、前記SEM観察結果より算出したディフェクト中の有機物残渣の割合(%)との積を、有機物残渣数(個)として算出した。
Claims (10)
- スルホン酸(塩)基を有する高分子化合物と、水と、を含有し、pH値が7未満である、
窒化珪素、酸化珪素またはポリシリコンを含む研磨済研磨対象物の表面における有機物残渣を低減するのに用いられる、
表面処理組成物。 - pH値が1以上3未満である、請求項1に記載の表面処理組成物。
- 酸をさらに含む、請求項1または請求項2に記載の表面処理組成物。
- 前記スルホン酸(塩)基を有する高分子化合物の含有量は、表面処理組成物に含まれる高分子化合物の総質量に対して80質量%超である、請求項1~3のいずれか1項に記載の表面処理組成物。
- 前記スルホン酸(塩)基を有する高分子化合物の含有量は、表面処理組成物に含まれる高分子化合物の総質量に対して95質量%超である、請求項4に記載の表面処理組成物。
- 前記研磨済研磨対象物は、窒化珪素を含む研磨済研磨対象物である、請求項1~5のいずれか1項に記載の表面処理組成物。
- 請求項1~6のいずれか1項に記載の表面処理組成物を用いて研磨済研磨対象物を表面処理して、研磨済研磨対象物の表面における有機物残渣を低減する、表面処理方法。
- 前記表面処理は、リンス研磨処理または洗浄処理によって行われる、請求項7に記載の表面処理方法。
- 前記スルホン酸(塩)基を有する高分子化合物と、前記水と、を混合することを含む、請求項1~6のいずれか1項に記載の表面処理組成物の製造方法。
- 研磨済研磨対象物が研磨済半導体基板であり、
請求項7または8に記載の表面処理方法によって、研磨済半導体基板の表面における有機物残渣を低減する表面処理工程を含む、半導体基板の製造方法。
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WO2023181739A1 (ja) | 2022-03-25 | 2023-09-28 | 富士フイルム株式会社 | 組成物、半導体素子の製造方法 |
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US10916435B2 (en) | 2021-02-09 |
US20200294808A1 (en) | 2020-09-17 |
JPWO2017169539A1 (ja) | 2019-02-07 |
KR102286318B1 (ko) | 2021-08-06 |
JP6832341B2 (ja) | 2021-02-24 |
TWI747891B (zh) | 2021-12-01 |
KR20180126472A (ko) | 2018-11-27 |
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