WO2011016331A1 - 半導体加工用シート - Google Patents
半導体加工用シート Download PDFInfo
- Publication number
- WO2011016331A1 WO2011016331A1 PCT/JP2010/062140 JP2010062140W WO2011016331A1 WO 2011016331 A1 WO2011016331 A1 WO 2011016331A1 JP 2010062140 W JP2010062140 W JP 2010062140W WO 2011016331 A1 WO2011016331 A1 WO 2011016331A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- layer
- pigment
- resin
- semiconductor processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
- H10P72/7402—Wafer tapes, e.g. grinding or dicing support tapes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W99/00—Subject matter not provided for in other groups of this subclass
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0041—Optical brightening agents, organic pigments
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0091—Complexes with metal-heteroatom-bonds
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/41—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the carrier layer
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
- H10P72/7416—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2848—Three or more layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
Definitions
- the present invention relates to a semiconductor processing sheet, and more particularly, to a semiconductor processing sheet comprising a plastic sheet containing a pigment.
- the present invention has been made in view of the above problems, and is caused by a blended pigment that causes deterioration of sheet thickness accuracy in a film forming process of a film for an adhesive sheet for semiconductor processing in a process for manufacturing a semiconductor device.
- An object of the present invention is to provide a semiconductor processing pressure-sensitive adhesive sheet capable of minimizing internal contamination of a die lip and the like, and partial blockage of an opening of the die lip and the like.
- the semiconductor processing sheet of the present invention is a semiconductor processing sheet comprising a base material layer containing a pigment-containing plastic sheet as a core layer, wherein the pigment-free layer is formed on the outermost main surface of the core layer. It is characterized by arranging.
- positioned at the outermost layer of one main surface of a core layer is formed of an adhesive layer.
- the outermost layer of at least one main surface is made of the same plastic material as that of the core layer. It is preferably applied as a protective sheet for wafer back grinding.
- the present invention it is possible to minimize the contamination of the inner surface of the film-forming die due to the pigment contained in the film while ensuring the visibility of the semiconductor processing sheet in the process for manufacturing a semiconductor device.
- partial blockage of the die lip opening due to pigment contamination can be reduced, and as a result, deterioration of sheet thickness accuracy due to pigment adhesion can be effectively prevented.
- the semiconductor processing sheet of the present invention includes at least a base material layer.
- This base material layer includes a plastic sheet containing a pigment as a core layer, and a pigment-free layer is arranged on the outermost layer on the front and back main surfaces of the core layer.
- the semiconductor processing sheet refers to a sheet used for various processing in a semiconductor process. By attaching this semiconductor processing sheet to a workpiece such as a wafer made of silicon, SiC, GaN, GaAs or the like, a protective sheet (during dicing, CMP, etching, etc.) or a dicing sheet can be used as the front and back surfaces. It can be used for various processes such as polishing sheets.
- the semiconductor processing sheet of the present invention preferably includes not only a base material layer but also one or two or more pressure-sensitive adhesive layers for fixing to a wafer, a manufacturing apparatus, or the like.
- one or more various layers may be provided in order to impart various functions.
- the semiconductor processing sheet of the present invention effectively prevents pigment contamination, particularly when used as a protective sheet for circuit surfaces, such as a wafer back grinding protective sheet that is used by being directly attached to a circuit in a wafer. be able to.
- the core layer in the base material layer imparts the self-supporting property of the semiconductor processing sheet.
- polyolefins such as polyethylene and polypropylene (specifically, low density polyethylene, linear low density polyethylene, high density polyethylene, Stretched polypropylene, non-stretched polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, etc.), Rubber component-containing polymers such as polyurethane, polytetrafluoroethylene, polyimide, polyamide, acetal resin, polyester, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, fluororesin, polystyrene, styrene-butadiene copolymer, etc .; glass ⁇ can be formed by a plastic sheet made of reinforced with plastic nonwoven fiber resin or the like.
- the core layer is generally molded containing various additives. Therefore, the core layer contains a pigment.
- the pigment is a white or colored powder that is insoluble in water, oil or the like, and includes both organic pigments and inorganic pigments. Generally used as a colorant for printing inks, paints, plastics, rubber, etc., but has a function as an extender, color developer, or for adjusting the constitution (coloring power, hue, electrical insulation, etc.) Is also included.
- the composition of the pigment itself is not particularly limited, but usually contains a metal element. Such metal elements take various forms such as compounds, complexes or ions, but in particular, the complexes are likely to cause undesirable contamination by pigments. Examples of the metal element contained in the pigment include copper, iron, titanium, magnesium, manganese, aluminum, cobalt, zinc, silver, gold, nickel, chromium, tin, and palladium.
- the thickness of the core layer is not particularly limited, and can be appropriately adjusted so as to have a strength that can function as a base material layer of a semiconductor processing sheet.
- a strength that can function as a base material layer of a semiconductor processing sheet For example, about 10 to 400 ⁇ m is suitable, and about 30 to 250 ⁇ m is preferable.
- the non-pigmented layer is arrange
- the semiconductor processing sheet of the present invention causes pigment contamination, particularly metal elements (particularly, complexes, etc.) due to pigments in the outermost layer on the surface that directly contacts the wafer surface, manufacturing equipment, manufacturing equipment, etc.
- the layer to get is not arranged.
- the front and back main surfaces refer to the front and back surfaces in which a sheet-like core layer having a thickness extends two-dimensionally.
- the pigment-free layer is contaminated on the inner surface of a film-forming device or the like due to the blended pigment in the film-forming process of the film.
- partial clogging for example, internal contamination of die lip and the like, and partial clogging of the opening of die lip and the like thereby
- the non-pigmented layer contains substantially no pigment.
- containing no pigment in the pigment-free layer means that no pigment (for example, a metal element) is contained in all the materials used as the raw material of the pigment-free layer.
- contamination derived from the pigment on the surface, or adhesion of the pigment to the surface can be substantially prevented or almost prevented.
- the inside of the manufacturing equipment, the manufacturing apparatus, for example, the inner surface of the film-forming die lip, etc. is visually determined.
- a method is mentioned.
- muscle etc. in the surface of the film formed through the film forming die lip etc. is mentioned.
- the transferred material for example, metal
- the outermost surface of the pigment-free layer to the semiconductor workpiece for example, the mirror surface of a silicon wafer
- ICP-MS inductively coupled plasma mass spectrometry
- the metal on the surface of the semiconductor workpiece is measured to be 1.0 ⁇ 10 10 atoms / cm 2 or less. Further, depending on the accuracy of the measuring apparatus, it is suitable that it is about 1 ⁇ 10 10 atoms / cm 2 or less, and is preferably less than the measurement limit.
- any of the commonly used devices, procedures, conditions, etc. can be used for the ICP-MS measurement method.
- a semiconductor processing sheet is attached to a semiconductor workpiece (for example, wafer: 100 mm thickness), a constant load rubber roller (for example, 2 kg) is reciprocated once on the sheet, and then the sheet is peeled off.
- a constant load rubber roller for example, 2 kg
- the entire oxide film on the surface where the sheet of the semiconductor workpiece is attached / peeled is etched with an appropriate etchant, for example, hydrofluoric acid.
- the total amount of the liquid obtained by etching is collected in an evaporating dish, heated and evaporated to dryness, and the residue is dissolved in an acid to obtain a test liquid for measurement.
- the obtained measurement sample solution is measured by ICP-MS.
- the element mass (ng) obtained by the measurement is divided by, for example, the atomic weight of Cu (or the above-described metal element) and converted to the number of moles, and converted to the number of atoms by multiplying by the Avogadro number.
- This value, etched semiconductor workpiece target area (e.g., 78.5 cm 2) divided by the, can be converted into the number of atoms per unit area (atoms / cm 2).
- total reflection fluorescent X-ray or the like may be used in addition to ICP-MS.
- the measured value of the metal is detected to be about 1 ⁇ 10 12 atoms / cm 2 or less, preferably about 1 ⁇ 10 11 atoms / cm 2 or less. More preferably, it is measured as below the limit.
- X-ray photoelectron spectroscopy may be used.
- the non-pigmented layer is, for example, the same as the material constituting the core layer described above unless a pigment, particularly, a metal element is contained. These materials can be appropriately selected and used. Especially, it is preferable that the pigment non-containing layer arrange
- the thickness of the non-pigmented layer is not particularly limited, and a layer that can function as a base material layer of a semiconductor processing sheet is preferable. Moreover, it can adjust suitably so that the spreading
- the non-pigmented layer may be disposed between the adhesive layer generally laminated in the adhesive sheet for semiconductor processing, but may be the adhesive layer itself.
- the non-pigmented layer when the non-pigmented layer is disposed on the pressure-sensitive adhesive layer side or as the pressure-sensitive adhesive layer, it is possible to more reliably prevent contamination of the semiconductor workpiece with the pigment derived from the core layer. it can.
- contamination of the inner surface of the extruder by the outermost layer containing a metallic pigment can be reduced, and thickness accuracy can be improved.
- the pressure-sensitive adhesive layer is not particularly limited, such as a thermoplastic resin, a thermosetting resin, or a combination of a thermoplastic resin and a thermosetting resin, and is described in, for example, JP-A-2008-91765.
- a pressure-sensitive adhesive usually used in the art can be used.
- the resin raw material and various additives which comprise an adhesive layer do not contain a pigment.
- thermoplastic resins include rubber polymers (natural rubber such as polyisoprene, butyl rubber, styrene-butadiene rubber, polybutadiene, butadiene-acrylonitrile, and synthetic rubber such as chloroprene rubber), ethylene-vinyl acetate copolymer. , Ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, polycarbonate resin, thermoplastic polyimide resin, polyamide resin such as 6-nylon and 6,6-nylon, phenoxy resin, acrylic resin, PET, PBT, etc. Saturated polyester resin, polyamideimide resin or fluororesin. Among them, an acrylic resin that has few ionic impurities and high heat resistance and can ensure the reliability of the semiconductor element is particularly preferable.
- Examples of the monomer component constituting the (meth) acrylic polymer include alkyl (meth) acrylates having a linear or branched alkyl group having 30 or less carbon atoms, preferably 4 to 18 carbon atoms.
- These (meth) acrylic polymers optionally include polyfunctional monomers, monomers and / or oligomers having an energy ray-curable functional group such as a carbon-carbon double bond, a polymerization initiator, light for the purpose of crosslinking. You may add a polymerization initiator, a crosslinking agent, etc.
- thermosetting resin examples include phenol resin, amino resin, unsaturated polyester resin, epoxy resin, polyurethane resin, silicone resin, and thermosetting polyimide resin.
- an epoxy resin containing a small amount of ionic impurities that corrode semiconductor elements is preferable.
- area may be used suitably for an adhesive layer, the thing in which a pigment does not contain is suitable for these additives.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited as long as sufficient adhesive strength can be ensured. Further, for example, it is preferable to adjust so that the diffusion, penetration, adhesion, and the like of the pigment from the core layer in the manufacturing process of the semiconductor processing pressure-sensitive adhesive sheet can be effectively prevented. For example, about 5 to 300 ⁇ m is exemplified.
- the structure of the sheet for semiconductor processing of the present invention includes (1) a pigment-free layer / core layer / adhesive layer, (2) a pigment-free layer / core layer / pigment-free layer / adhesive layer, (3) Various laminated structures such as pressure-sensitive adhesive layer / pigment-free layer / core layer / pigment-free layer / pressure-sensitive adhesive layer can be employed.
- the film thickness of each of these layers can be in the above-described range, but depending on the laminated state, it functions as an original sheet for semiconductor processing and also functions to prevent contamination by the pigment due to the core layer. It is preferable to set the thickness to be obtained.
- the semiconductor processing sheet of the present invention can be formed by a method for manufacturing a semiconductor processing sheet known in the art. For example, first, a core layer and a pigment-free layer are prepared. Each of these layers may be prepared by separately forming into a sheet shape and may be laminated, or may be prepared by forming integrally using an extruder.
- the adhesive layer is laminated on the base material layer.
- the pressure-sensitive adhesive layer may be directly laminated or coated on the core layer or the pigment-free layer, or the adhesive is coated on the process sheet coated with the release agent, dried, and then the adhesive.
- a transfer coating method in which the layer is laminated on the core layer or the pigment-free layer may be used.
- the non-pigmented layer, the core layer, and the pressure-sensitive adhesive layer may be arranged in this order and co-extrusion laminated.
- Such a sheet for semiconductor processing of the present invention usually has performance required by the sheet for semiconductor processing, for example, strength of base layer, elasticity, tensile storage elastic modulus, elongation rate, tensile strength, adhesive strength, peel strength. These performances can be exhibited by appropriately selecting materials, additives, thickness, laminated structure, lamination method, etc. used for each layer.
- Example 1 As raw materials, 0.05 parts by weight of phthalocyanine copper powder as a pigment with respect to EVA resin (ethylene-vinyl acetate copolymer resin, vinyl content 10%, P1007 manufactured by Mitsui DuPont) and 99.95 parts by weight of EVA resin The added resin was prepared. Three layers of EVA resin and pigment-containing resin (as an intermediate layer) were extruded using a single screw extruder to obtain a sheet for forming a base material layer. In the obtained sheet, the pigment-containing resin layer was 80 ⁇ m thick, and the EVA resin layers on both sides were 10 ⁇ m thick (total thickness: 100 ⁇ m).
- EVA resin ethylene-vinyl acetate copolymer resin, vinyl content 10%, P1007 manufactured by Mitsui DuPont
- 99.95 parts by weight of EVA resin The added resin was prepared. Three layers of EVA resin and pigment-containing resin (as an intermediate layer) were extruded using a single screw extruder to obtain a sheet
- an acrylic pressure-sensitive adhesive (added 3 parts of an isocyanate cross-linking agent (Coronate L) to a toluene solution polymer polymerized with 100 parts of BA / 10 parts of AA) was applied to a silicone-treated polyester film at a thickness of 15 ⁇ m. It dried and produced the adhesive layer transfer sheet.
- the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer transfer sheet was attached to the sheet forming the base material layer obtained above, and the pressure-sensitive adhesive layer was transferred to prepare a pressure-sensitive adhesive sheet for semiconductor processing.
- Example 2 As raw materials, a resin in which 0.05 part by weight of copper azomethine yellow powder was added as a pigment to an LDPE resin (high pressure method low density polyethylene, molecular weight: 3.4 ⁇ 104) and 99.95 parts by weight of LDPE resin was prepared.
- the LDPE resin and the pigment-containing resin (as an intermediate layer) were extruded with a single-screw extruder to obtain a sheet for forming a base material layer.
- the pigment-containing resin layer was 80 ⁇ m thick, and the LDPE resin layers on both sides were 10 ⁇ m thick (total thickness: 100 ⁇ m).
- the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer transfer sheet as in Example 1 was attached to the sheet forming the base material layer obtained above, and the pressure-sensitive adhesive layer was transferred to produce a pressure-sensitive adhesive sheet for semiconductor processing. .
- Example 3 As a raw material, LDPE resin (high pressure method low density polyethylene, molecular weight: 3.4 ⁇ 104) and resin in which 0.05 part by weight of copper azomethine yellow powder as a pigment is added to 99.95 part by weight of LDPE resin are uniaxial. Two layers were extruded with an extruder to obtain a sheet for forming a base material layer. In the obtained sheet, the pigment-containing resin layer was 80 ⁇ m thick, and the LDPE resin layer was 20 ⁇ m thick (total thickness: 100 ⁇ m).
- Example 4 As a raw material, a polypropylene resin is used as an intermediate layer with a resin obtained by adding 0.05 parts by weight of a copper azomethine yellow powder as a pigment to 99.95 parts by weight of a hydrogenated styrene-based thermoplastic elastomer resin (“Tough Tech H1052” manufactured by Asahi Kasei).
- a sheet on which a base material layer was formed by extruding three layers with a single screw extruder was obtained.
- the pigment-containing resin layer was 80 ⁇ m thick
- the polypropylene resin layers on both sides were 10 ⁇ m thick (total thickness: 100 ⁇ m).
- the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer transfer sheet as in Example 1 was attached to the sheet forming the base material layer obtained above, and the pressure-sensitive adhesive layer was transferred to produce a pressure-sensitive adhesive sheet for semiconductor processing. .
- Example 5 As a raw material, 0.05 part by weight of copper azomethine yellow powder was added as a pigment to 99.95 parts by weight of EVA resin (ethylene-vinyl acetate copolymer resin, vinyl content 10%, P1007 manufactured by Mitsui DuPont). The resin and the LDPE resin were subjected to three-layer extrusion with a single screw extruder so that the pigment-containing resin was an intermediate layer to obtain a sheet for forming a base material layer. In the obtained sheet, the pigment-containing resin layer was 80 ⁇ m thick, and the LDPE resin layers on both sides were 10 ⁇ m thick (total thickness: 100 ⁇ m).
- EVA resin ethylene-vinyl acetate copolymer resin, vinyl content 10%, P1007 manufactured by Mitsui DuPont.
- the resin and the LDPE resin were subjected to three-layer extrusion with a single screw extruder so that the pigment-containing resin was an intermediate layer to obtain a sheet for forming a base
- the acrylic pressure-sensitive adhesive was prepared by dissolving 20 g of the polymer obtained in Reference Example 1 of JP-A-2001-234136 in 80 g of ethyl acetate and adding 0.2 g of a polyisocyanate compound and 0.4 g of a polyfunctional epoxy compound. Stir until. The solution was applied onto a film substrate made of a polyester film having a thickness of 50 ⁇ m and dried in a drying oven at 70 ° C. and 130 ° C. for 3 minutes, respectively, to form an adhesive layer having a thickness of 35 ⁇ m. The pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer transfer sheet as in Example 1 was attached to the sheet forming the base material layer obtained above, and the pressure-sensitive adhesive layer was transferred to produce a pressure-sensitive adhesive sheet for semiconductor processing. .
- Comparative Example 1 Using a resin obtained by adding 0.04 parts by weight of phthalocyanine copper powder as a pigment to 99.96 parts by weight of EVA resin as a raw material, one layer is extruded with a single screw extruder to obtain a sheet for forming a base material layer It was. In the obtained sheet, the pigment-containing resin layer was 100 ⁇ m thick. The pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer transfer sheet as in Example 1 was attached to the sheet forming the base material layer obtained above, and the pressure-sensitive adhesive layer was transferred to produce a pressure-sensitive adhesive sheet for semiconductor processing. .
- the amount of copper transferred from the front and back surfaces of each sheet to the wafer was measured by ICP-MS.
- a semiconductor processing sheet was first attached to a silicon wafer (mirror surface, 100 mm thickness), a 2 kg constant load rubber roller was reciprocated once from the top of the sheet, and then the sheet was peeled off.
- the entire oxide film on the sheet sticking / peeling side of the silicon wafer was etched with an appropriate hydrofluoric acid.
- the liquid obtained by etching was collected in an evaporating dish, heated and evaporated to dryness, and the residue was dissolved in an acid to obtain a measurement test solution. Subsequently, the obtained measurement sample solution was measured by ICP-MS.
- the element mass (ng) obtained by the measurement is divided by the atomic weight of Cu to be converted into the number of moles, and is converted to the number of atoms by multiplying the Avogadro number. This value is converted into the area of the etched silicon wafer (for example, 78 by dividing .5cm 2), it was converted to the number of atoms per unit area (atoms / cm 2).
- the copper transfer amount was measured to be below the detection limit in ICP-MS on both the substrate layer side surface and the adhesive layer side surface of the obtained adhesive sheet for semiconductor processing. Make sure it will be.
- This measurement is a value measured by the method described above.
- the measured value of the metal is about 1 ⁇ 10 12 atoms / cm 2 or less and 16 atomic% or less, respectively.
- the semiconductor processed sheet of the present invention contains a pigment and can be widely used for a film forming apparatus resulting from this, for example, a pressure sensitive adhesive sheet having a concern that the inner surface of a die lip is contaminated.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Laminated Bodies (AREA)
Abstract
Description
しかし、粘着シートに含有される顔料が、粘着シートの最外層に移動又は付着することがあり、これによって、製造設備、製造装置内部、例えば、フィルム製膜用ダイリップ等の内面を汚染するという懸念があった。
このような半導体加工用シートでは、
コア層の一方主面の最外層に配置された顔料非含有層が、粘着剤層によって形成されることが好ましい。
少なくとも一主面の最外層が、コア層と同じプラスチック材料からなることが好ましい。
ウェハ裏面研削用保護シートとして適用されることが好ましい。
ここで、半導体加工用シートとは、半導体プロセスにおける種々の加工に用いられるシートを指す。この半導体加工用シートを、シリコン、SiC、GaN、GaAs等からなるウェハ等の被加工物に貼着することにより、保護シート(ダイシング時、CMP時、エッチング時等)又はダイシングシートとして、表裏面研磨用シート等の種々のプロセスに用いることができる。本発明の半導体加工用シートは基材層を備えるのみならず、ウェハ、製造装置等に固定するために、1層又は2層以上の粘着剤層を備えていることが好ましい。また、種々の機能を付与するために、粘着剤層以外に、1層以上の各種層を備えていてもよい。
本発明の半導体加工用シートは、特に、ウェハにおける回路に直接貼着して使用されるウェハ裏面研削用保護シート等、回路面等の保護シートとして用いた場合に、有効に顔料汚染を防止することができる。
ここで、「(メタ)アクリル」は、「アクリル」及び「メタクリル」の双方を意味する。
ここでの表裏主面とは、厚みをもったシート状のコア層が二次元に拡張している表面及び裏面を指す。
そのために、顔料非含有層は、顔料を実質的に含有しない。そして、このような機能を効果的に実現するために、コア層の材料及び厚みのみならず、顔料非含有層の材料、厚み及び位置、後述する粘着剤層の材料及び厚み等の種々の要因のバランスを図っている。
顔料非含有層において顔料を含有しないとは、顔料非含有層の原料として用いる全ての材料において顔料(例えば、金属元素)が含まれていないことを意味する。また、半導体加工用シートとして製造された際に、その表面に、顔料に由来する汚染が、あるいはその表面への顔料の付着が、実質的に阻止又はほとんど阻止され得ることを意味する。
また、フィルム製膜用ダイリップ等を通して製膜されるフィルムの表面における筋等の有無を目視にて判断する方法が挙げられる。
さらに、半導体加工用シートを半導体被加工対象物に適用し、剥離した後、顔料非含有層の最外面から半導体被加工対象物(例えば、シリコンウェハのミラー面)への転写物(例えば、金属)を、ICP-MS(誘導結合プラズマ質量分析法)により測定した場合に、半導体被加工対象物表面における金属が1.0×1010atoms/cm2以下と測定されることが挙げられる。また、測定装置の精度によっては、1×1010atoms/cm2程度以下であることが適しており、測定限界以下であることが好ましい。
(1)まず、半導体加工用シートを半導体被加工対象物(例えば、ウェハ:100mm厚)に貼着し、シート上から定加重ゴムローラー(例えば、2kg)を一往復させ、その後、シートを剥離する。
(2)次いで、半導体被加工対象物のシートを貼着/剥離した表面の酸化膜を全量適当なエッチャント、例えば、フッ酸でエッチングする。エッチングにより得られた液は、全量蒸発皿に採取し、加熱・蒸発乾固し、残渣を酸に溶解して、測定供試液を得る。
(3)続いて、得られた測定供試液を、ICP-MSにより測定する。
(4)測定で得られた元素質量(ng)を、例えば、Cu(又は上述した金属元素)の原子量で除してモル数に換算し、アボガドロ数を乗じて原子数に変換する。この値を、エッチングした半導体被加工対象物面積(例えば、78.5cm2)で除することにより、単位面積当たりの原子数(atoms/cm2)に換算することができる。
これらの方法においては、それぞれ、金属の測定値が1×1012atoms/cm2程度以下と検出されることが適しており、1×1011atoms/cm2程度以下であることが好ましく、検出限界以下と測定されることがより好ましい。
このように、顔料非含有層を、粘着剤層側に又は粘着剤層として配置する場合には、コア層に由来する顔料による半導体被加工対象物への汚染を、より確実に防止することができる。例えば、コア層が顔料非含有層にはさまれた状態で押出成形する場合には金属性顔料含有の最外層による押出機の内面汚染を低減することができ、厚み精度を向上させることができるのみならず、被貼付材料への顔料汚染をも防止することができる。
なお、粘着剤層には、当該分野で使用される添加剤を適宜用いてもよいが、これらの添加剤には、顔料が含有されないものが適している。
なお、これらの各層の膜厚は、上述した範囲とすることができるが、積層状態によって、半導体加工用シートとして本来の機能を果たし、かつコア層に起因する顔料による汚染を防止する機能を果たし得る厚みに設定することが好ましい。
実施例1
原料として、EVA樹脂(エチレン-酢酸ビニル共重合樹脂、ビニル含有量10%、三井デュポン(株)製P1007)及びEVA樹脂99.95重量部に対して顔料としてフタロシアニン銅粉末0.05重量部を添加した樹脂を準備した。EVA樹脂と顔料含有樹脂(中間層として)とを、一軸押出成形機で3層押出して、基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が80μm厚、両側のEVA樹脂層が10μm厚(全厚:100μm)であった。
また、シリコーン処理済みのポリエステルフィルムに、アクリル系粘着剤(BA100部/AA10部で重合したトルエン溶液ポリマーにイソシアネート架橋剤(コロネートL)3部を添加)を15μm厚で塗布して、120℃で乾燥し、粘着剤層転写シートを作製した。
粘着剤層転写シートの粘着剤層側を、上で得られた基材層を形成するシートに貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
原料として、LDPE樹脂(高圧法低密度ポリエチレン、分子量:3.4×104)及びLDPE樹脂99.95重量部に対して顔料として銅アゾメチンイエロー粉末0.05重量部を添加した樹脂を準備した。LDPE樹脂と顔料含有樹脂(中間層として)とを、一軸押出成形機で3層押出して、基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が80μm厚、両側のLDPE樹脂層が10μm厚(全厚:100μm)であった。
実施例1と同様の粘着剤層転写シートの粘着剤層側を、上で得られた基材層を形成するシートに貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
原料として、LDPE樹脂(高圧法低密度ポリエチレン、分子量:3.4×104)及びLDPE樹脂99.95重量部に対して顔料として銅アゾメチンイエロー粉末0.05重量部を添加した樹脂を用いて一軸押出成形機で2層押出して、基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が80μm厚、LDPE樹脂層が20μm厚(全厚:100μm)であった。
粘着剤層を30μmとした以外、実施例1と同様の粘着剤層転写シートの粘着剤層側を、上で得られた基材層におけるLPDE樹脂側に貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
原料として、水添スチレン系熱可塑性エラストマー樹脂(旭化成製「タフテックH1052」)99.95重量部に対して顔料として銅アゾメチンイエロー粉末0.05重量部を添加した樹脂を中間層として、ポリプロピレン樹脂を外層として、一軸押出成形機で3層押出して基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が80μm厚、両側のポリプロピレン樹脂層が10μm厚(全厚:100μm)であった。
実施例1と同様の粘着剤層転写シートの粘着剤層側を、上で得られた基材層を形成するシートに貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
原料として、EVA樹脂(エチレン-酢酸ビニル共重合樹脂、ビニル含有量10%、三井デュポン(株)製P1007)99.95重量部に対して顔料として銅アゾメチンイエロー粉末0.05重量部を添加した樹脂と、LDPE樹脂とを、顔料含有樹脂が中間層となるように、一軸押出成形機で3層押出して、基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が80μm厚、両側のLDPE樹脂層が10μm厚(全厚:100μm)であった。アクリル系粘着剤は、特開2001-234136中の参考例1で得られたポリマー20gを酢酸エチル80g中に溶解し、ポリイソシアネート化合物0.2g、多官能エポキシ化合物を0.4g添加して均一になるまで攪拌した。その溶液を、厚さが50μmのポリエステルフィルムからなるフィルム基材上に塗布し、乾燥オーブンにて70℃および130℃で各々3分間乾燥して、厚さが35μmの接着剤層を形成した。
実施例1と同様の粘着剤層転写シートの粘着剤層側を、上で得られた基材層を形成するシートに貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
原料として、EVA樹脂99.96重量部に対して顔料としてフタロシアニン銅粉末0.04重量部を添加した樹脂を用いて、一軸押出成形機で1層押出して、基材層を形成するシートを得た。得られたシートでは、顔料含有樹脂層が100μm厚であった。
実施例1と同様の粘着剤層転写シートの粘着剤層側を、上で得られた基材層を形成するシートに貼り付け、粘着剤層を転写して、半導体加工用粘着シートを作製した。
また、実施例及び比較例で得られた半導体加工用シートについて、以下の項目について適時評価を行った。
(ダイリップの汚染状態)
フィルム製膜後に顔料非含有のLDPE材料を等速で10分流し、その後、ダイを分解し、リップ部分に対する顔料の付着有無を目視で確認した。
(フィルムの厚さバラツキ)
製膜後のフィルムについて、幅方向に10mm間隔で1/10000ダイヤルゲージにて厚みを測定した。
(最大厚さ-最小厚さ)×100÷(平均厚さ)=厚さバラツキ(%)とした。
各シートの表裏面からウェハへの銅転写量を、ICP-MSにより測定した。
ここでの測定方法は、まず、半導体加工用シートをシリコンウェハ(鏡面、100mm厚)に貼着し、シート上から2kgの定加重ゴムローラーを一往復させ、その後、そのシートを剥離した。次いで、シリコンウェハのシート貼着/剥離面側の酸化膜を全量適当なフッ酸でエッチングした。エッチングにより得られた液を、全量蒸発皿に採取し、加熱・蒸発乾固し、残渣を、酸に溶解して、測定供試液を得た。
続いて、得られた測定供試液を、ICP-MSにより測定した。
測定で得られた元素質量(ng)を、Cuの原子量で除してモル数に換算し、アボガドロ数を乗じて原子数に変換し、この値を、エッチングしたシリコンウェハの面積(例えば、78.5cm2)で除することにより、単位面積当たりの原子数(atoms/cm2)に換算した。
また、ダイスリップ内面の顔料汚染を有効に防止できることから、ダイスリップ等の洗浄工程を大幅に低減させることができ、連続的な製膜装置の稼動を実現することができる。
さらに、被貼付材料への顔料汚染をも防止することができる。
Claims (4)
- 顔料を含有するプラスチックシートをコア層として含む基材層を備える半導体加工用シートであって、前記コア層の表裏主面の最外層に、顔料非含有層を配置してなることを特徴とする半導体加工用シート。
- コア層の一方主面の最外層に配置された顔料非含有層が、粘着剤層によって形成される請求項1に記載の半導体加工用シート。
- 少なくとも一主面の最外層が、コア層と同じプラスチック材料からなる請求項1又は2に記載の半導体加工用シート。
- ウェハ裏面研削用保護シートとして適用される請求項1~3のいずれか1つに記載の半導体加工用シート。
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| US8298041B2 (en) * | 2010-10-08 | 2012-10-30 | Taiwan Semiconductor Manufacturing Company, Ltd. | System and method for wafer back-grinding control |
| JP2013239502A (ja) * | 2012-05-14 | 2013-11-28 | Gunze Ltd | ダイシング用基体フィルム |
| MY196409A (en) * | 2015-10-21 | 2023-03-29 | Furukawa Electric Co Ltd | Surface Protection Adhesive Tape for Semiconductor Wafer Backgrinding, And Semiconductor Wafer Grinding Method |
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| JP2003173994A (ja) * | 2001-09-27 | 2003-06-20 | Mitsui Chemicals Inc | 半導体ウエハ表面保護用粘着フィルム及びそれを用いる半導体ウエハの保護方法 |
| JP2004107644A (ja) * | 2002-07-26 | 2004-04-08 | Nitto Denko Corp | 加工用粘着シートとその製造方法 |
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| JP2005068420A (ja) * | 2003-08-07 | 2005-03-17 | Mitsui Chemicals Inc | 粘着シート |
| TW200800584A (en) * | 2006-04-03 | 2008-01-01 | Gunze Kk | Surface protective tape used for back grinding of semiconductor wafer and base film for the surface protective tape |
| JP4875414B2 (ja) * | 2006-06-23 | 2012-02-15 | 三井化学東セロ株式会社 | 半導体ウェハの裏面研削用粘着フィルム及びそれを用いた半導体ウェハの裏面研削方法 |
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| JP2003173994A (ja) * | 2001-09-27 | 2003-06-20 | Mitsui Chemicals Inc | 半導体ウエハ表面保護用粘着フィルム及びそれを用いる半導体ウエハの保護方法 |
| JP2004107644A (ja) * | 2002-07-26 | 2004-04-08 | Nitto Denko Corp | 加工用粘着シートとその製造方法 |
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| KR20120062739A (ko) | 2012-06-14 |
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