WO2023002846A1 - ダイシング保護層用の樹脂組成物及び半導体ウェハの加工方法 - Google Patents
ダイシング保護層用の樹脂組成物及び半導体ウェハの加工方法 Download PDFInfo
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- WO2023002846A1 WO2023002846A1 PCT/JP2022/026756 JP2022026756W WO2023002846A1 WO 2023002846 A1 WO2023002846 A1 WO 2023002846A1 JP 2022026756 W JP2022026756 W JP 2022026756W WO 2023002846 A1 WO2023002846 A1 WO 2023002846A1
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- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- QQUBYBOFPPCWDM-UHFFFAOYSA-N trihydroxy-(4-trihydroxysilylphenyl)silane Chemical compound O[Si](O)(O)C1=CC=C([Si](O)(O)O)C=C1 QQUBYBOFPPCWDM-UHFFFAOYSA-N 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
Classifications
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/6834—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used to protect an active side of a device or wafer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68381—Details of chemical or physical process used for separating the auxiliary support from a device or wafer
Definitions
- the present disclosure relates to a resin composition for a dicing protective layer and a semiconductor wafer processing method.
- Semiconductor devices are generally manufactured through the following processes. First, a semiconductor wafer is attached to an adhesive sheet for dicing, and in that state, the semiconductor wafer is separated into semiconductor chips (dicing step). After that, a pick-up process, a press-bonding process, a die-bonding process, etc. are carried out to fabricate a semiconductor device.
- Patent Document 1 discloses a water-insoluble polysaccharide having a cyclic sugar as a basic skeleton
- Patent Document 2 discloses a monomer constitutional unit derived from an acid anhydride.
- the protective layer of the semiconductor wafer is required not to separate from the semiconductor wafer during dicing or dissolve in the cooling water used during dicing. On the other hand, since the protective layer is removed after dicing, it is required to dissolve in the alkaline aqueous solution used for removing the protective layer.
- the present disclosure is a resin composition for a dicing protective layer, which has excellent adhesion during dicing of a semiconductor wafer and can form a protective layer having excellent removability after dicing, and a semiconductor using the resin composition. It is an object of the present invention to provide a wafer processing method.
- One aspect of the present disclosure relates to the following resin composition for a dicing protective layer and a method for processing a semiconductor wafer.
- a resin composition for a dicing protective layer containing an acrylic resin having a carboxyl group and an organic solvent.
- the acrylic resin has a structural unit derived from (meth)acrylic acid.
- the acrylic resin further has a structural unit derived from a (meth)acrylic acid alkyl ester.
- a resin composition for a dicing protective layer which has excellent adhesion during dicing of a semiconductor wafer and can form a protective layer having excellent removability after dicing, and the resin composition are used. It is possible to provide a method for processing a semiconductor wafer having a thickness.
- (meth)acrylic acid means at least one of “acrylic acid” and “methacrylic acid” corresponding thereto, and the same applies to other similar expressions such as (meth)acrylate.
- a or B may include either A or B, or may include both.
- solid content refers to the non-volatile content excluding volatile substances such as water and solvents contained in the composition, and indicates the components that remain without volatilization when the composition is dried. , and also include those that are liquid, starch syrup, and waxy at room temperature around 25°C.
- each component in the composition means the total amount of the plurality of substances present in the composition unless otherwise specified when there are multiple substances corresponding to each component in the composition. Unless otherwise specified, the materials and the like exemplified below may be used alone or in combination of two or more.
- a numerical range indicated using "-" indicates a range that includes the numerical values before and after "-" as the minimum and maximum values, respectively.
- the upper limit value or lower limit value of the numerical range at one step may be replaced with the upper limit value or lower limit value of the numerical range at another step.
- the upper or lower limits of the numerical ranges may be replaced with the values shown in the examples.
- the resin composition according to the present embodiment contains an acrylic resin having a carboxy group (hereinafter sometimes simply referred to as "acrylic resin”) and an organic solvent.
- the acrylic resin according to this embodiment has a carboxy group from the viewpoint of improving the solubility in an alkaline aqueous solution.
- a carboxy group can be introduced by radically polymerizing a monomer having a carboxy group.
- Examples of monomers having a carboxy group include (meth)acrylic acid, ⁇ -bromo(meth)acrylic acid, ⁇ -chloro(meth)acrylic acid, ⁇ -furyl (meth)acrylic acid, ⁇ -styryl (meth)acrylic acid, acids, fumaric acid, cinnamic acid, ⁇ -cyanocinnamic acid, itaconic acid, crotonic acid, and propiolic acid.
- the acrylic resin preferably has a structural unit derived from (meth)acrylic acid from the viewpoint of increasing the solubility in an alkaline aqueous solution.
- the content of structural units derived from (meth)acrylic acid is the total mass of structural units derived from monomers constituting the acrylic resin. 5 to 25% by mass, 8 to 20% by mass, or 10 to 15% by mass based on the.
- the acrylic resin may further have a structural unit derived from a (meth)acrylic acid alkyl ester.
- Acrylic resins can be produced, for example, by radically polymerizing (meth)acrylic acid and (meth)acrylic acid alkyl esters.
- Examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, and (meth)acrylate.
- the content of structural units derived from (meth)acrylic acid alkyl ester is 40% by mass based on the total mass of structural units derived from monomers constituting the acrylic resin. 50% by mass or more, or 55% by mass or more. From the viewpoint of further improving the solubility in an alkaline aqueous solution, the content of structural units derived from (meth)acrylic acid alkyl ester is 90 mass based on the total mass of structural units derived from monomers constituting the acrylic resin. % or less, 88 mass % or less, or 85 mass % or less.
- the acrylic resin may further have a structural unit derived from styrene or a styrene derivative.
- Styrene derivatives include, for example, vinyltoluene, ⁇ -methylstyrene, p-methylstyrene, and p-ethylstyrene.
- the acrylic resin may have a hydroxyl group from the viewpoint of increasing the solubility in an alkaline aqueous solution.
- monomers having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, ( 2-Hydroxybutyl meth)acrylate, and glycerol mono(meth)acrylate.
- the acrylic resin may have structural units other than the above.
- monomers that provide such structural units include benzyl (meth)acrylate or derivatives thereof, acrylonitrile, tetrahydrofurfuryl (meth)acrylate, glycidyl (meth)acrylate, 2,2,2-trifluoroethyl (meth)acrylates and 2,2,3,3-tetrafluoropropyl (meth)acrylates.
- the acid value of the acrylic resin may be 50 mgKOH/g or more, 60 mgKOH/g or more, or 70 mgKOH/g or more from the viewpoint of further increasing the solubility in an alkaline aqueous solution, and 150 mgKOH from the viewpoint of increasing the water resistance during dicing. /g or less, 140 mg KOH/g or less, or 130 mg KOH/g or less.
- the weight average molecular weight (Mw) of the acrylic resin may be 10,000 to 100,000, 15,000 to 90,000, 20,000 to 80,000, 30,000 to 70,000, or 40,000 to 60,000.
- Mw is a value obtained by measuring by a gel permeation chromatography (GPC) method and converting from a standard polystyrene calibration curve.
- the content of the acrylic resin in the resin composition according to the present embodiment may be, for example, 5-30% by mass, 8-25% by mass, or 10-20% by mass.
- Organic solvent As the organic solvent according to the present embodiment, a solvent that can dissolve the acrylic resin and can be easily removed when forming the protective layer can be used.
- the organic solvent preferably contains at least one solvent selected from the group consisting of glycol ether-based solvents and aliphatic carboxylic acid ester-based solvents, from the viewpoint of improving the film-forming properties of the resin composition.
- Glycol ether solvents include, for example, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monobutyl ether acetate, propylene Glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol dipropyl ether, and propylene glycol dibutyl ether.
- aliphatic carboxylic acid ester solvents include methyl lactate, ethyl lactate, n-propyl lactate, isopropyl lactate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, and n-amyl acetate. , isoamyl acetate, isopropyl propionate, n-butyl propionate, and isobutyl propionate.
- the resin composition according to the embodiment may further contain a leveling agent.
- a leveling agent By blending the leveling agent into the resin composition, it is possible to prevent striations (repellency, unevenness, etc.) and improve coatability onto semiconductor wafers.
- Leveling agents include, for example, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, and polyoxyethylene octylphenol ether.
- Examples of commercially available leveling agents include Megafac F171, F173, R-08 (manufactured by DIC Corporation, trade names), Florard FC430, FC431 (manufactured by Sumitomo 3M Co., Ltd., trade names), organosiloxane polymers KP341, and KBM303. , KBM403 and KBM803 (manufactured by Shin-Etsu Chemical Co., Ltd., trade names).
- the amount may be 0.01 to 5 parts by mass, 0.03 to 3 parts by mass, or 0.05 to 2 parts by mass with respect to 100 parts by mass of the acrylic resin.
- the resin composition according to this embodiment may further contain a coupling agent.
- a coupling agent By adding the coupling agent to the resin composition, it becomes easier to suppress peeling of the protective layer during dicing.
- Coupling agents include, for example, organic silane compounds and aluminum chelate compounds.
- organic silane compounds include vinyltriethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -methacryloxypropyltrimethoxysilane, ureapropyltriethoxysilane, methylphenylsilanediol, ethylphenylsilanediol, n- propylphenylsilanediol, isopropylphenylsilanediol, n-butylphenylsilanediol, isobutylphenylsilanediol, tert-butylphenylsilanediol, diphenylsilanediol, ethylmethylphenylsilanol, n-propylmethylphenylsilanol, isopropylmethylphenylsilanol, n-butylmethylphenylsilanol, isoprop
- the amount of the coupling agent used may be 0.1 to 10 parts by mass, 0.3 to 8 parts by mass, or 0.5 to 5 parts by mass with respect to 100 parts by mass of the acrylic resin.
- the protective layer formed on the semiconductor wafer using the resin composition according to this embodiment has excellent adhesion to the semiconductor wafer during dicing, and can be easily removed with an alkaline aqueous solution after dicing.
- a method for processing a semiconductor wafer according to the present embodiment includes a step of forming a protective layer on a semiconductor wafer using the above resin composition for a dicing protective layer, and a step of dicing the semiconductor wafer on which the protective layer is formed. and removing the protective layer from the diced semiconductor wafer with an alkaline aqueous solution.
- the method of forming the protective layer on the semiconductor wafer is not particularly limited, and the protective layer may be formed by coating the above-described resin composition on the semiconductor wafer by a method such as spin coating and drying it. After forming a resin layer to be a protective layer on a release film, the release film may be peeled off after bonding the resin layer onto the semiconductor wafer.
- the protective layer according to this embodiment is excellent in adhesion and water resistance, and thus can protect the semiconductor wafer during dicing.
- the thickness of the protective layer may be 0.3 ⁇ m or more, 0.5 ⁇ m or more, or 0.8 ⁇ m or more from the viewpoint of enhancing protection during dicing, and from the viewpoint of shortening the peeling time, 3.0 ⁇ m or less, It may be 2.0 ⁇ m or less, or 1.5 ⁇ m or less. That is, the thickness of the protective layer may be 0.3-3.0 ⁇ m, 0.5-2.0 ⁇ m, or 0.8-1.5 ⁇ m.
- Examples of the alkaline aqueous solution used for removing the protective layer include an aqueous ammonia solution and an aqueous tetramethylammonium hydroxide (TMAH) solution.
- concentration of the alkaline aqueous solution may be 0.01 to 5% by mass, 0.1 to 3.0% by mass or less, or 0.5 to 2.0% by mass in the case of the ammonia aqueous solution, and in the case of the TMAH aqueous solution, It may be 0.1 to 10 mass %, 0.5 to 5 mass % or less, or 1.0 to 5.0 mass %. Removal of the protective layer may be performed, for example, at 5 to 30° C. for 5 to 300 seconds.
- the processed semiconductor wafer after removing the protective layer can be used for connection with other semiconductor wafers or semiconductor chips.
- the Mw of the acrylic resin is a value measured by GPC and converted using a standard polystyrene calibration curve. Mw is measured using "HLC-8320GPC” manufactured by Tosoh Corporation as a measuring device, "Gelpack GL-A150-S/GL-A160-S” manufactured by Showa Denko Materials Co., Ltd. as a column, and tetrahydrofuran as an eluent. Measurement was performed under conditions of 1 mL/min and a column temperature of 40°C. The calibration curve was approximated by the cubic equation of the universal calibration curve according to JIS K 7252-2 (2016) using a set of 5 standard polystyrene samples (PStQuick MP-H and PStQuick B manufactured by Tosoh Corporation).
- Example 1 Preparation of Resin Composition for Dicing Protective Layer and Formation of Protective Layer
- a resin composition was prepared by mixing 10 parts by mass of a solution of acrylic resin (P-1) with 20 parts by mass of ethyl lactate and filtering through a filter with a pore size of 0.5 ⁇ m.
- the resin composition was coated on a 6-inch silicon wafer (thickness 0.625 mm) and heated on a hot plate set at 100° C. for 2 minutes to form a 1.1 ⁇ m thick protective layer on the silicon wafer.
- Example 2 A resin composition was prepared in the same manner as in Example 1, except that the solution of the acrylic resin (P-1) was changed to the solution of the acrylic resin (P-2), and the resin composition was used to prepare a silicon wafer. A protective layer having a thickness of 1.2 ⁇ m was formed on the substrate.
- Example 3 A resin composition was prepared in the same manner as in Example 1, except that the acrylic resin (P-1) solution was changed to the acrylic resin (P-3) solution, and the resin composition was used to prepare a silicon wafer. A protective layer having a thickness of 1.2 ⁇ m was formed on the substrate.
- Comparative example 1 20 parts by mass of a styrene-maleic anhydride copolymer (Polyscope, trade name “XIRAN-1000”, Mw: 5000) is mixed with 80 parts by mass of a 4% by mass aqueous ammonia solution, and the mixture is filtered through a filter with a pore size of 0.5 ⁇ m. Thus, a resin composition was prepared. An attempt was made to form a protective layer on a silicon wafer using the resin composition, but repelling and unevenness occurred, so a protective layer for evaluation could not be formed.
- a styrene-maleic anhydride copolymer Polyscope, trade name “XIRAN-1000”, Mw: 5000
- Comparative example 2 13 parts by mass of a styrene-maleic anhydride copolymer (Polyscope, trade name “XIRAN-3000”, Mw: 10000) is mixed with 87 parts by mass of a 4% by mass aqueous ammonia solution, and the mixture is filtered through a filter with a pore size of 0.5 ⁇ m. Thus, a resin composition was prepared. A protective layer having a thickness of 0.9 ⁇ m was formed on a silicon wafer in the same manner as in Example 1, except that the resin composition was used.
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Abstract
Description
[2]前記アクリル樹脂が、(メタ)アクリル酸に由来する構造単位を有する、上記[1]に記載の樹脂組成物。
[3]前記アクリル樹脂が、(メタ)アクリル酸アルキルエステルに由来する構造単位を更に有する、上記[2]に記載の樹脂組成物。
[4]前記アクリル樹脂の重量平均分子量が、10000~100000である、上記[1]~[3]のいずれかに記載の樹脂組成物。
[5]前記有機溶剤が、グリコールエーテル系の溶剤及び脂肪族カルボン酸エステル系の溶剤からなる群より選ばれる少なくとも1種を含む、上記[1]~[4]のいずれかに記載の樹脂組成物。
[6]上記[1]~[5]のいずれかに記載のダイシング保護層用の樹脂組成物を用いて、半導体ウェハ上に保護層を形成する工程と、前記保護層が形成された半導体ウェハをダイシングする工程と、前記ダイシングされた半導体ウェハから前記保護層をアルカリ水溶液により除去する工程と、を備える、半導体ウェハの加工方法。
[7]前記保護層の厚さが、0.3~3.0μmである、上記[6]に記載の半導体ウェハの加工方法。
本実施形態に係る樹脂組成物は、カルボキシ基を有するアクリル樹脂(以下、単に「アクリル樹脂」という場合がある。)と、有機溶剤とを含有する。
本実施形態に係るアクリル樹脂は、アルカリ水溶液への溶解性を良好にする観点から、カルボキシ基を有する。カルボキシ基は、カルボキシ基を有するモノマーをラジカル重合することで導入することができる。
本実施形態に係る有機溶剤としては、アクリル樹脂を溶解することができ、保護層を形成する際に除去し易い溶剤を用いることができる。有機溶剤は、樹脂組成物の成膜性を向上する観点から、グリコールエーテル系の溶剤及び脂肪族カルボン酸エステル系の溶剤からなる群より選ばれる少なくとも1種を含むことが好ましい。
実施形態に係る樹脂組成物は、レベリング剤を更に含有してもよい。レベリング剤を樹脂組成物に配合することによって、ストリエーション(ハジキ、ムラ等)を防いで、半導体ウェハへの塗布性を向上することができる。
本実施形態に係る樹脂組成物は、カップリング剤を更に含有してもよい。カップリング剤を樹脂組成物に配合することによって、ダイシング時に保護層の剥離を抑制し易くなる。カップリング剤としては、例えば、有機シラン化合物及びアルミキレート化合物が挙げられる。
本実施形態に係る半導体ウェハの加工方法は、上述したダイシング保護層用の樹脂組成物を用いて、半導体ウェハ上に保護層を形成する工程と、保護層が形成された半導体ウェハをダイシングする工程と、ダイシングされた半導体ウェハから保護層をアルカリ水溶液により除去する工程と、を備える。
(合成例1)
撹拌機、冷却器、ガス導入管、滴下ロート、及び温度計を備えたフラスコに、プロピレングリコールモノメチルエーテルアセテート80質量部及び乳酸エチル80質量部を加え、窒素ガスを導入しながら80℃で撹拌した。次いで、モノマーであるメタクリル酸26質量部、メタクリル酸メチル110質量部、及びアクリル酸ブチル64質量部と、重合開始剤である2,2’-アゾビス(イソブチロニトリル)3質量部と、プロピレングリコールモノメチルエーテルアセテート44質量部及び乳酸エチル44質量部との混合物を3時間かけてフラスコ内に滴下した後、80℃で4時間撹拌し、さらに100℃で2時間撹拌した。その後、室温まで冷却してアクリル樹脂(P-1)の溶液(固形分45質量%)を得た。P-1のMwは、43000であった。
モノマーを、アクリル酸26質量部、スチレン60質量部、及びアクリル酸ブチル114質量部に変更した以外は合成例1と同様にして、アクリル樹脂(P-2)の溶液を得た。P-2のMwは、46000であった。
モノマーを、メタクリル酸22質量部、メタクリル酸2-ヒドロキシエチル34質量部、メタクリル酸メチル42質量部、及びアクリル酸ブチル102質量部に変更した以外は合成例1と同様にして、アクリル樹脂(P-3)の溶液を得た。P-3のMwは、44000であった。
(実施例1)
アクリル樹脂(P-1)の溶液10質量部を乳酸エチル20質量部と混合し、孔径0.5μmのフィルターでろ過することで、樹脂組成物を調製した。
アクリル樹脂(P-1)の溶液をアクリル樹脂(P-2)の溶液に変更した以外は、実施例1と同様にして樹脂組成物を調製し、該樹脂組成物を用いて、シリコンウェハ上に厚さ1.2μmの保護層を形成した。
アクリル樹脂(P-1)の溶液をアクリル樹脂(P-3)の溶液に変更した以外は、実施例1と同様にして樹脂組成物を調製し、該樹脂組成物を用いて、シリコンウェハ上に厚さ1.2μmの保護層を形成した。
スチレン無水マレイン酸共重合体(Polyscope社、商品名「XIRAN-1000」、Mw:5000)20質量部を、4質量%のアンモニア水溶液80質量部と混合し、孔径0.5μmのフィルターでろ過することで、樹脂組成物を調製した。該樹脂組成物を用いて、シリコンウェハ上に保護層の形成を試みたが、ハジキ及びムラが発生したため、評価用の保護層を形成できなかった。
スチレン無水マレイン酸共重合体(Polyscope社、商品名「XIRAN-3000」、Mw:10000)13質量部を、4質量%のアンモニア水溶液87質量部と混合し、孔径0.5μmのフィルターでろ過することで、樹脂組成物を調製した。該樹脂組成物を用いた以外は実施例1と同様にして、シリコンウェハ上に厚さ0.9μmの保護層を形成した。
保護層が形成されたシリコンウェハについて、以下の評価を行った。結果を表1に示す。
保護層の外観を目視で確認し、保護層にハジキ及びムラがない場合をOK、保護層にハジキ又はムラがある場合をNGと判断した。
ダイシングソー(株式会社ディスコ、商品名「DAD3350」)及びダイシングブレード(株式会社ディスコ、商品名「ZH05-SD4500-N1-70-DD」)を用いて、スピンドル回転毎分30000rpm、送り速度50mm/sの条件で、チップサイズが縦5mm、横5mmとなるように、保護層が形成されたシリコンウェハをダイシングした。ダイシング後、保護層の縦横の切断ライン交点近傍を顕微鏡で観察した。保護膜の溶解及び剥離がない場合をOK、保護層の溶解又は剥離がある場合をNGと判断した。
アルカリ性水溶液として、1.0質量%のアンモニア水溶液及び2.38質量%のTMAH水溶液を準備した。ダイシングにより得られた保護層付きチップを、アルカリ性水溶液に23℃で浸漬し、保護膜の溶解時間を測定した。保護層の溶解時間が60秒以内である場合をOK、保護層の溶解時間が60秒を超える場合をNGと判断した。
Claims (7)
- カルボキシ基を有するアクリル樹脂と、有機溶剤とを含有する、ダイシング保護層用の樹脂組成物。
- 前記アクリル樹脂が、(メタ)アクリル酸に由来する構造単位を有する、請求項1に記載の樹脂組成物。
- 前記アクリル樹脂が、(メタ)アクリル酸アルキルエステルに由来する構造単位を更に有する、請求項2に記載の樹脂組成物。
- 前記アクリル樹脂の重量平均分子量が、10000~100000である、請求項1に記載の樹脂組成物。
- 前記有機溶剤が、グリコールエーテル系の溶剤及び脂肪族カルボン酸エステル系の溶剤からなる群より選ばれる少なくとも1種を含む、請求項1に記載の樹脂組成物。
- 請求項1~5のいずれか一項に記載のダイシング保護層用の樹脂組成物を用いて、半導体ウェハ上に保護層を形成する工程と、
前記保護層が形成された半導体ウェハをダイシングする工程と、
前記ダイシングされた半導体ウェハから前記保護層をアルカリ水溶液により除去する工程と、
を備える、半導体ウェハの加工方法。 - 前記保護層の厚さが、0.3~3.0μmである、請求項6に記載の半導体ウェハの加工方法。
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CN202280050355.4A CN117730398A (zh) | 2021-07-20 | 2022-07-05 | 切割保护层用的树脂组合物及半导体晶圆的加工方法 |
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Citations (4)
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JP2001023935A (ja) * | 1999-07-09 | 2001-01-26 | Sharp Corp | 半導体装置の製造方法 |
JP2014172932A (ja) | 2013-03-06 | 2014-09-22 | Nagase Chemtex Corp | 電子部品保護膜形成用組成物 |
JP2018129365A (ja) | 2017-02-07 | 2018-08-16 | 東京応化工業株式会社 | ダイシング用保護膜基材、ダイシング用保護膜組成物、ダイシング用保護シート、及び被加工ウエーハの製造方法 |
JP2021077768A (ja) * | 2019-11-08 | 2021-05-20 | 東京応化工業株式会社 | 保護膜形成剤、半導体チップの製造方法、及び(メタ)アクリル樹脂の製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2001023935A (ja) * | 1999-07-09 | 2001-01-26 | Sharp Corp | 半導体装置の製造方法 |
JP2014172932A (ja) | 2013-03-06 | 2014-09-22 | Nagase Chemtex Corp | 電子部品保護膜形成用組成物 |
JP2018129365A (ja) | 2017-02-07 | 2018-08-16 | 東京応化工業株式会社 | ダイシング用保護膜基材、ダイシング用保護膜組成物、ダイシング用保護シート、及び被加工ウエーハの製造方法 |
JP2021077768A (ja) * | 2019-11-08 | 2021-05-20 | 東京応化工業株式会社 | 保護膜形成剤、半導体チップの製造方法、及び(メタ)アクリル樹脂の製造方法 |
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US20240240061A1 (en) | 2024-07-18 |
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TW202311317A (zh) | 2023-03-16 |
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