WO2015115060A1 - ウエハ加工体、ウエハ加工用仮接着材、及び薄型ウエハの製造方法 - Google Patents
ウエハ加工体、ウエハ加工用仮接着材、及び薄型ウエハの製造方法 Download PDFInfo
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- WO2015115060A1 WO2015115060A1 PCT/JP2015/000253 JP2015000253W WO2015115060A1 WO 2015115060 A1 WO2015115060 A1 WO 2015115060A1 JP 2015000253 W JP2015000253 W JP 2015000253W WO 2015115060 A1 WO2015115060 A1 WO 2015115060A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- polymer layer
- layer
- temporary adhesive
- siloxane
- Prior art date
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Images
Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
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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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
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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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/10—Block or graft copolymers containing polysiloxane sequences
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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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
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- 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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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted 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
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G77/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
- C08G77/50—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
-
- 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
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
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- 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
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- 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
- H01L2221/68318—Auxiliary support including means facilitating the separation of a device or wafer from the auxiliary support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
-
- H—ELECTRICITY
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- 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
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- 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
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- 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
- H01L2221/68386—Separation by peeling
Definitions
- the present invention relates to a wafer processed body, a temporary adhesive for wafer processing, and a method for manufacturing a thin wafer, which make it possible to effectively obtain a thin wafer.
- the three-dimensional mounting technology is a semiconductor manufacturing technology in which one semiconductor chip is thinned and further laminated in multiple layers while being connected by a through silicon via (TSV).
- TSV through silicon via
- a back surface protective tape has been applied to the opposite side of the ground surface to prevent wafer damage during grinding.
- this tape uses an organic resin film as a base material and is flexible, but has insufficient strength and heat resistance, and is not suitable for performing a TSV forming process or a wiring layer forming process on the back surface.
- Patent Document 1 a technique for peeling an adhesive layer from a support by irradiating an adhesive containing a light-absorbing substance with high-intensity light and decomposing the adhesive layer.
- Patent Document 2 a technique that uses a heat-meltable hydrocarbon-based compound as an adhesive and performs bonding and peeling in a heat-melted state has been proposed.
- the former technique requires an expensive apparatus such as a laser, and has a problem that the processing time per substrate becomes long.
- the latter technique is simple because it is controlled only by heating, but its application range is narrow because the thermal stability at a high temperature exceeding 200 ° C. is insufficient.
- these temporary adhesive layers are not suitable for forming a uniform film thickness of a high step substrate and for complete adhesion to a support.
- Patent Document 3 a technique using a silicone adhesive for the temporary adhesive layer has been proposed.
- the substrate is bonded to the support using an addition-curing silicone adhesive, and the substrate is separated from the support by immersing in a chemical that dissolves or decomposes the silicone resin at the time of peeling. . Therefore, it takes a very long time for peeling, and application to an actual manufacturing process is difficult.
- the present invention has been made in view of the above-described problems, and can be easily bonded temporarily, and can be formed with a uniform film thickness on a high step substrate, and is compatible with TSV formation and wafer backside wiring processes. Furthermore, it is excellent in wafer thermal process resistance such as CVD (Chemical Vapor Deposition), and can be easily peeled even when the thin wafer before peeling is cut, thereby improving the productivity of the thin wafer.
- An object of the present invention is to provide a processed wafer, a temporary adhesive for wafer processing, and a method for manufacturing a thin wafer using the same.
- a temporary adhesive layer is formed on a support, and a wafer having a circuit surface on the front surface and a back surface processed is laminated on the temporary adhesive layer.
- the temporary adhesive layer is a first temporary adhesive layer made of a thermoplastic organopolysiloxane polymer layer (A) releasably adhered to the surface of the wafer, and is peelably laminated on the first temporary adhesive layer.
- a second temporary adhesive layer comprising the thermosetting siloxane-modified polymer layer (B), and a thermosetting siloxane polymer that is releasably laminated to the second temporary adhesive layer and is releasably adhered to the support.
- a processed wafer having a composite temporary adhesive layer having a three-layer structure with a third temporary adhesive layer made of layer (C).
- thermoplastic organopolysiloxane polymer layer (A) is partially formed on the surface of the wafer and adhered in a peelable manner.
- thermosetting siloxane-modified polymer layer (B) and the wafer with circuit are partially laminated directly, and the wafer with circuit is being processed. Can reduce the risk of peeling.
- a temporary adhesive for wafer processing for temporarily bonding a wafer having a circuit surface on the front surface and a back surface to be processed to a support
- a first temporary adhesive layer comprising a thermoplastic organopolysiloxane polymer layer (A) that can be peelably bonded to the surface of the wafer, and a thermosetting siloxane-modified layer laminated on the first temporary adhesive layer in a peelable manner.
- a second temporary adhesive layer comprising a coalesced layer (B) and a thermosetting siloxane polymer layer (C) comprising a thermosetting siloxane polymer layer (C) which is releasably laminated to the second temporary adhesive layer and which can be peelably adhered to the support.
- a temporary adhesive for wafer processing comprising a composite temporary adhesive layer having a three-layer structure of three temporary adhesive layers.
- thermoplastic organopolysiloxane polymer layer (A) has a peripheral portion partially removed.
- thermosetting siloxane-modified polymer layer (B) and the wafer with circuit can be used as a temporary adhesive layer of the wafer processed body. Since the peripheral portion is directly laminated, the risk of peeling during processing of the wafer with circuit can be reduced.
- thermoplastic organopolysiloxane polymer layer (A) contains 99.000 to 99.999 mol% of siloxane units (D units) represented by R 11 R 12 SiO 2/2 , R The siloxane unit (M unit) represented by 13 R 14 R 15 SiO 1/2 is 1.000 to 0.001 mol%, and the siloxane unit (T unit) represented by R 16 SiO 3/2 is 0.000. ⁇ 0.500 mol% (provided that R 11 , R 12 , R 13 , R 14 , R 15 and R 16 each represents an unsubstituted or substituted monovalent hydrocarbon group) and has a weight average molecular weight.
- a non-reactive organopolysiloxane layer having a low molecular weight component of 200,000 to 1,000,000 and a molecular weight of 740 or less is preferably 0.5% by mass or less.
- thermoplastic organopolysiloxane polymer layer (A) is preferable because of excellent adhesion and heat resistance.
- thermosetting siloxane-modified polymer layer (B) has a repeating unit represented by the following general formula (1) and a siloxane bond-containing polymer having a weight average molecular weight of 3,000 to 500,000.
- R 1 to R 4 represent a monovalent hydrocarbon group having 1 to 8 carbon atoms which may be the same or different.
- M is an integer from 1 to 100
- B is a positive number
- A is 0 or a positive number.
- X is a divalent organic group represented by the following general formula (2).
- Z is A divalent organic group selected from any one of the following: N is 0 or 1; R 5 and R 6 are each an alkyl group or alkoxy group having 1 to 4 carbon atoms, and may be the same or different from each other. k is 0, 1, or 2. ]]
- thermosetting siloxane-modified polymer layer (B) is preferable because it is more excellent in heat resistance.
- thermosetting siloxane-modified polymer layer (B) has a repeating unit represented by the following general formula (3) and a siloxane bond-containing polymer having a weight average molecular weight of 3,000 to 500,000. Any selected from a phenol compound having an average of 2 or more phenol groups in one molecule and an epoxy compound having an average of 2 or more epoxy groups in one molecule as a crosslinking agent with respect to 100 parts by mass A cured product layer of a composition containing 0.1 to 50 parts by mass of one or more of them is preferred. [Wherein R 1 to R 4 represent a monovalent hydrocarbon group having 1 to 8 carbon atoms which may be the same or different.
- M is an integer from 1 to 100
- B is a positive number
- A is 0 or a positive number
- Y is a divalent organic group represented by the following general formula (4). (Where V is And a p is 0 or 1.
- R 7 and R 8 are each an alkyl group or alkoxy group having 1 to 4 carbon atoms, and may be the same or different from each other. h is 0, 1, or 2. ]]
- thermosetting siloxane-modified polymer layer (B) is preferable because it is more excellent in heat resistance.
- thermosetting siloxane polymer layer (C) is (C-1) an organopolysiloxane having two or more alkenyl groups in one molecule, (C-2) Organohydrogenpolysiloxane containing a hydrogen atom (Si—H group) bonded to two or more silicon atoms in one molecule: (C— 2) An amount in which the molar ratio of Si—H groups in the component is from 0.3 to 10, (C-3) platinum-based catalyst, It is preferable that it is a hardened
- thermosetting siloxane polymer layer (C) is preferable because it is superior in CVD resistance.
- thermosetting siloxane polymer layer (C) further comprises, as the component (C-4), a reaction control agent: a total of 100 masses of the components (C-1) and (C-2). 0.1 to 10 parts by mass with respect to parts, It is preferable that it contains.
- thermosetting siloxane polymer layer (C) can prevent the treatment liquid (composition) from being thickened or gelled before heat curing.
- thermosetting when interfacial peeling from the polymer layer (C) of the thermosetting siloxane-modified polymer layer (B) laminated on the thermosetting siloxane polymer layer (C) Is preferably 2 gf or more and 50 gf or less as a 180 ° peel peeling force of a 25 mm wide test piece.
- thermosetting siloxane-modified polymer layer (B) having such a peel-peeling power is preferred because there is no risk of wafer misalignment during wafer grinding and peeling is easy.
- thermoplastic organopolysiloxane polymer layer When joining to a support through a composite temporary adhesive layer composed of A), the thermosetting siloxane-modified polymer layer (B), and the thermosetting siloxane polymer layer (C), After forming the thermosetting siloxane-modified polymer layer (B) on the thermosetting siloxane polymer layer (C) formed on the support, the polymer layers (C) and (B) Bonding the formed support and the wafer with a circuit formed with the polymer layer (A) under vacuum; (B) thermosetting the polymer layers (B) and (C); (C) grinding or polishing a non-circuit-formed surface of the wafer bonded to the support; (D) processing the non-circuit-formed surface of the wafer; (E) a step of integrally peeling
- the temporary adhesive layer having the three-layer system according to the present invention is used for bonding the wafer and the support, and the through-electrode structure is formed using the temporary adhesive layer.
- a thin wafer having a bump connection structure can be easily manufactured.
- the support can be easily peeled off from the processed wafer, and even if the processed wafer is cut by dicing before peeling, it is easily peeled off. can do.
- the surface state of the wafer with a circuit is obtained by laminating the support with the polymer layers (C) and (B) and the wafer with a circuit with the polymer layer (A) attached under vacuum.
- the polymer layer (B) can be formed by a spin coating method, and bonding can be performed.
- thermoplastic organopolysiloxane polymer layer When joining to a support through a composite temporary adhesive layer composed of A), the thermosetting siloxane-modified polymer layer (B), and the thermosetting siloxane polymer layer (C), After forming the thermosetting siloxane-modified polymer layer (B) on the thermoplastic organopolysiloxane polymer layer (A) formed on the wafer with a circuit, the polymer layers (A) and (B ) And the substrate with the thermosetting siloxane polymer layer (C) formed thereon are bonded together under vacuum, (B) thermosetting the polymer layers (B) and (C); (C) grinding or polishing a non-circuit-formed surface of the wafer bonded to the support; (D) processing the non-circuit-formed surface of the wa
- the temporary adhesive layer having the three-layer system according to the present invention is used for bonding the wafer and the support, and the through-electrode structure is formed using the temporary adhesive layer.
- a thin wafer having a bump connection structure can be easily manufactured.
- the support can be easily peeled off from the processed wafer, and even if the processed wafer is cut by dicing before peeling, it is easily peeled off. can do.
- the spin coat method is performed by laminating the wafer with a circuit on which the polymer layers (A) and (B) are formed and the support on which the thermosetting siloxane polymer layer (C) is formed, under vacuum.
- the treatment can be performed on the side surface of the support without any residue of the polymer layer (B), so that the residue does not peel off during the subsequent steps.
- thermoplastic organopolysiloxane polymer layer (A) on the wafer with circuit and to remove the peripheral portion.
- thermosetting siloxane-modified polymer layer (B) and the wafer with circuit are directly laminated at the periphery, and there is a risk that peeling occurs during processing of the wafer with circuit. Can be reduced.
- the temporary adhesive layer in the present invention has a three-layer structure, and in particular, by using a thermosetting siloxane-modified resin (polymer layer (B)) as a substrate bonding support layer, the resin is not thermally decomposed.
- the resin does not flow at high temperatures and has high heat resistance, so it can be applied to a wide range of semiconductor film forming processes, and an adhesive layer with high film thickness uniformity can be applied to wafers with steps. Because of this film thickness uniformity, it is possible to easily obtain a uniform thin wafer having a thickness of 50 ⁇ m or less. Furthermore, even after the thin wafer is manufactured, even if this wafer is cut by dicing or the like before peeling, it can be easily peeled off from the support at room temperature, so that a thin wafer that is easily broken can be easily manufactured.
- thermoplastic temporary adhesive layer composed of a thermoplastic organopolysiloxane polymer layer
- thermosetting temporary adhesive layer composed of a thermosetting siloxane-modified polymer layer
- A from the wafer side to the temporary adhesive layer having a three-layer system of the thermosetting temporary adhesive layer made of the thermosetting siloxane polymer layer of (C)
- C thermosetting siloxane polymer layer
- FIG. 1 is a cross-sectional view showing an example of a wafer processed body of the present invention.
- the wafer processed body of the present invention has a circuit surface on the front surface, a wafer 1 to be processed on the back surface, a support 3 that supports the wafer 1 when the wafer 1 is processed, and these wafers 1.
- a temporary adhesive layer 2 interposed between the substrate 3 and the support 3.
- the temporary adhesive layer 2 comprises a thermoplastic organopolysiloxane polymer layer (A) (first temporary adhesive layer) and a thermosetting siloxane. It consists of a three-layer structure of a modified polymer layer (B) (second temporary adhesive layer) and a thermosetting siloxane polymer layer (C) (third temporary adhesive layer).
- the third temporary adhesive layer is bonded to the support 3 so as to be peelable.
- the temporary adhesive for wafer processing of the present invention comprises the laminates (A), (B) and (C) described above, and the respective layers are laminated in a peelable manner.
- thermoplastic organopolysiloxane polymer layer The first temporary adhesive layer is composed of a thermoplastic organopolysiloxane polymer.
- thermoplastic organopolysiloxane polymer examples include 99.000 to 99.999 mol%, preferably 99.500 to 99.99 mol% of a siloxane unit (D unit) represented by R 11 R 12 SiO 2/2 .
- siloxane unit (M unit) represented by R 13 R 14 R 15 SiO 1/2 is 1.000 to 0.001 mol%, preferably 0.500 to 0.001 mol%, R 16 SiO
- the siloxane unit (T unit) represented by 3/2 is contained in an amount of 0.000 to 0.500 mol%, preferably 0.000 to 0.100 mol%, and the weight average molecular weight is 200,000 to 1,000.
- the organic substituents R 11 , R 12 , R 13 , R 14 , R 15 and R 16 are unsubstituted or substituted monovalent hydrocarbon groups, preferably unsubstituted or substituted carbon atoms having 1 to 10 carbon atoms.
- Monovalent hydrocarbon group specifically, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, n-pentyl group, cyclopentyl group, n-hexyl group, etc.
- Alkyl groups such as cyclohexyl groups, hydrocarbon groups such as aryl groups such as phenyl groups and tolyl groups, and groups in which some or all of these hydrogen atoms are substituted with halogen atoms, preferably methyl Group and phenyl group.
- the molecular weight of the organopolysiloxane is a weight average molecular weight obtained by GPC (gel permeation chromatography) according to a calibration curve prepared with a polystyrene standard substance (in this specification, “weight average molecular weight” means this)
- the weight average molecular weight is 200,000 or more, more preferably 350,000 or more, and 1,000,000 or less, more preferably 800,000 or less, and further a molecular weight of 740 or less.
- Component content is 0.5 mass% or less, More preferably, it is 0.1 mass% or less.
- a weight average molecular weight of 200,000 or more is preferable because it can sufficiently withstand a grinding process for thinning the wafer.
- the weight average molecular weight is 1,000,000 or less, it can be washed in the washing step after the completion of the step, which is preferable.
- the low molecular weight component having a molecular weight of 740 or less is 0.5% by mass or less, sufficient heat resistance can be obtained for heat treatment during formation of the through electrode and heat treatment of the bump electrode formed on the back surface of the wafer. preferable.
- the D unit preferably constitutes 99.000 to 99.999 mol% in the resin, and if it is 99.000 mol% or more, it is preferable because it can withstand a grinding process for wafer thinning, If it is 99.999 mol% or less, peeling from the temporary adhesive layer (B) after the completion of the process is easy.
- M unit is added to seal the active group at the end of the resin mainly composed of D unit, and is used to adjust the molecular weight.
- thermoplastic organopolysiloxane polymer layer is formed into a film in advance, and even if the film is bonded to a wafer using a roll laminator or the like, the solution is formed on the wafer by a method such as spin coating or roll coater. May be used.
- the layer (A) is formed on the wafer by a method such as spin coating, it is preferable to coat the resin as a solution.
- a hydrogen-based solvent is preferably used.
- the layer (A) is preferably used after being formed with a film thickness of 0.1 to 10 ⁇ m, preferably 0.5 to 5.0 ⁇ m. If it is 0.1 micrometer or more, it can apply
- thermoplastic organopolysiloxane polymer layer (A) when used as the first temporary adhesive layer of the wafer processed body, is partially formed on the surface of the wafer (a part of the peripheral portion is removed) and is peelably bonded. It is preferred that
- thermosetting siloxane-modified polymer layer (B) and the wafer with circuit are partially laminated directly, and the wafer with circuit is being processed. Can reduce the risk of peeling.
- thermosetting siloxane-modified polymer layer (B) which is a constituent element of the wafer processed body and the wafer processing temporary adhesive of the present invention, is not particularly limited as long as it is a thermosetting siloxane-modified polymer layer.
- a layer of a cured product of a thermosetting composition mainly comprising the thermosetting siloxane-modified polymer represented by (1) or (3) is preferable.
- Polymer of general formula (1) (phenolic siloxane polymer): A siloxane bond-containing polymer having a repeating unit represented by the following general formula (1) and having a weight average molecular weight of 3,000 to 500,000, preferably 10,000 to 100,000 (phenol group-containing organosiloxane bond-containing polymer) Compound).
- R 1 to R 4 represent a monovalent hydrocarbon group having 1 to 8 carbon atoms which may be the same or different.
- M is an integer from 1 to 100
- B is a positive number
- A is 0 or a positive number.
- X is a divalent organic group represented by the following general formula (2).
- N is 0 or 1;
- R 5 and R 6 are each an alkyl group or alkoxy group having 1 to 4 carbon atoms, and may be the same or different from each other.
- k is 0, 1, or 2.
- R 1 to R 4 include an alkyl group such as a methyl group and an ethyl group, a phenyl group, and the like, and m is preferably an integer of 3 to 60, more preferably 8 to 40. . B / A is 0 to 20, particularly 0.5 to 5.
- Polymer of general formula (3) (epoxy-modified siloxane polymer): A siloxane bond-containing polymer (epoxy group-containing silicone polymer compound) having a repeating unit represented by the following general formula (3) and having a weight average molecular weight of 3,000 to 500,000.
- R 1 to R 4 represent a monovalent hydrocarbon group having 1 to 8 carbon atoms which may be the same or different.
- M is an integer from 1 to 100
- B is a positive number
- A is 0 or a positive number.
- Y is a divalent organic group represented by the following general formula (4).
- V is And a p is 0 or 1.
- R 7 and R 8 are each an alkyl group or alkoxy group having 1 to 4 carbon atoms, and may be the same or different from each other.
- h is 0, 1, or 2.
- thermosetting composition mainly composed of the thermosetting siloxane-modified polymer of the general formula (1) or (3) is used for the thermosetting.
- one or more crosslinking agents selected from epoxy compounds having two or more epoxy groups is used for the thermosetting.
- examples of the amino condensate, melamine resin, and urea resin modified with formalin or formalin-alcohol include the following.
- a melamine resin (condensate) modified with formalin or formalin-alcohol is a modified melamine monomer (for example, trimethoxymethylmonomethylolmelamine) or a multimer (for example, an oligomer such as a dimer or trimer).
- a melamine resin (condensate) modified with formalin or formalin-alcohol is a modified melamine monomer (for example, trimethoxymethylmonomethylolmelamine) or a multimer (for example, an oligomer such as a dimer or trimer).
- a modified melamine monomer for example, trimethoxymethylmonomethylolmelamine
- a multimer for example, an oligomer such as a dimer or trimer.
- these can be used 1 type or in mixture of 2 or more types.
- Preparation of a urea resin (condensate) modified with formalin or formalin-alcohol is, for example, modified by methylolation of a urea condensate of a desired molecular weight with formalin according to a known method, or further alkoxylated with alcohol. And may be denatured.
- Specific examples of the urea resin modified with formalin or formalin-alcohol include, for example, methoxymethylated urea condensate, ethoxymethylated urea condensate, propoxymethylated urea condensate and the like. In addition, these can be used 1 type or in mixture of 2 or more types.
- phenol compound having an average of two or more methylol groups or alkoxymethylol groups in one molecule examples include (2-hydroxy-5-methyl) -1,3-benzenedimethanol, 2,2 ′, Examples include 6,6′-tetramethoxymethylbisphenol A.
- these phenol compounds can be used 1 type or in mixture of 2 or more types.
- an epoxy compound having an average of two or more epoxy groups in one molecule or an average of two or more phenol groups in one molecule 1 type or more of the phenolic compound which has these is contained as a crosslinking agent.
- the epoxy compound having a polyfunctional epoxy group used in the general formulas (1) and (3) is not particularly limited, but in particular, a bifunctional, trifunctional, tetrafunctional or higher polyfunctional epoxy resin,
- a bifunctional, trifunctional, tetrafunctional or higher polyfunctional epoxy resin For example, EOCN-1020, EOCN-102S, XD-1000, NC-2000-L, EPPN-201, GAN, NC6000 manufactured by Nippon Kayaku Co., Ltd. or a crosslinking agent represented by the following formula can be contained.
- thermosetting siloxane-modified polymer is an epoxy-modified siloxane polymer of the above general formula (3)
- m p-based cresol novolak resin
- EP-6030G manufactured by Asahi Organic Materials Industries, Ltd.
- trifunctional phenolic compounds such as Tris-P-PA manufactured by Honshu Chemical Co., Ltd.
- tetrafunctional phenolic compounds such as TEP-TPA manufactured by Asahi Organic Materials Corporation.
- the amount of the crosslinking agent is 0.1 to 50 parts by weight, preferably 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the thermosetting siloxane-modified polymer. Two or more types may be mixed and blended.
- thermosetting siloxane-modified polymer 10 parts by mass or less of a curing catalyst such as an acid anhydride may be added to 100 parts by mass of the thermosetting siloxane-modified polymer.
- this composition (thermosetting siloxane-modified polymer) is dissolved in a solution and applied, specifically, by spin coating, roll coater, die coater or the like, particularly by spin coating (A) layer or (C) Form on the layer.
- ketones such as cyclohexanone, cyclopentanone, methyl-2-n-amyl ketone; 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, 1-ethoxy -Alcohols such as 2-propanol; ethers such as propylene glycol monomethyl ether, ethylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, propylene glycol dimethyl ether, diethylene glycol dimethyl ether; propylene glycol monomethyl ether acetate, propylene glycol Monoethyl ether acetate, ethyl
- a filler such as a known antioxidant or silica may be added in an amount of 50 parts by mass or less based on 100 parts by mass of the thermosetting siloxane-modified polymer.
- a surfactant may be added to improve the coating uniformity.
- antioxidants that can be added to the polymer layer (B) include tetrakis [methylene- (3,5-di-t-butyl-4-hydroxyhydrocinnamate)] methane (trade name: Examples include hindered phenol compounds such as ADK STAB (AO-60).
- thermosetting siloxane-modified polymer layer (B) made of the above-mentioned thermosetting siloxane-modified polymer preferably has a film thickness upon curing of 15 to 150 ⁇ m, preferably 20 to 120 ⁇ m, depending on the level difference on the wafer side. It is more preferable to form a film with If the film thickness is 15 ⁇ m or more, it can sufficiently withstand the grinding process for thinning the wafer, and if it is 150 ⁇ m or less, there is no risk of resin deformation in the heat treatment process such as the TSV forming process, and it can withstand practical use. Therefore, it is preferable.
- thermosetting siloxane polymer layer (C) which is a component of the wafer processed body and the wafer processing temporary adhesive of the present invention is not particularly limited as long as it is made of a thermosetting siloxane polymer.
- a cured product layer of a composition containing the following components (C-1) to (C-3) and, if necessary, the component (C-4) is preferable.
- C-1) an organopolysiloxane having two or more alkenyl groups in one molecule
- C-2 Organohydrogenpolysiloxane containing hydrogen atoms (Si—H group) bonded to two or more silicon atoms in one molecule: (C-2) )
- C-3) Platinum-based catalyst an organopolysiloxane having two or more alkenyl groups in one molecule.
- thermosetting siloxane polymer layer (C) is further added to the reaction control agent (C-1) and the component (C-2) as the component (C-4) in an amount of 0.1 parts per 100 parts in total. 1 to 10 parts by weight, It is preferable that it contains.
- Component (C-1) is an organopolysiloxane having two or more alkenyl groups in one molecule.
- the component (C-1) is preferably a linear or branched diorganopolysiloxane containing two or more alkenyl groups in one molecule.
- Particularly preferred is a diorganopolysiloxane containing 0.6 mol% (number of moles of alkenyl group / number of moles of Si) to 9 mol% in one molecule.
- R 9 (3-a) X a SiO- (R 9 XSiO) m - (R 9 2 SiO) n -SiR 9 (3-a) X a ... (5)
- R 9 is independently a monovalent hydrocarbon group having no aliphatic unsaturated bond
- X is independently an alkenyl group-containing monovalent organic group
- a is an integer of 0 to 3.
- 2a + m is a number with an alkenyl group content of 0.6 to 9 mol% in one molecule, and in the formula (6), m + 2 has an alkenyl group content of 0.1 in one molecule. (The number is 6 to 9 mol%.)
- R 9 is preferably a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- an alkyl group such as a methyl group, an ethyl group, a propyl group, or a butyl group
- a cycloalkyl group such as a cyclohexyl group
- An aryl group such as a phenyl group and a tolyl group, and an alkyl group such as a methyl group or a phenyl group is particularly preferable.
- the alkenyl group-containing monovalent organic group represented by X is preferably an organic group having 2 to 10 carbon atoms, and an alkenyl group such as a vinyl group, an allyl group, a hexenyl group, or an octenyl group; an acryloylpropyl group, an acryloylmethyl group, or a methacryloylpropyl group.
- (Meth) acryloylalkyl groups such as groups; (meth) acryloxyalkyl groups such as acryloxypropyl groups, acryloxymethyl groups, methacryloxypropyl groups, methacryloxymethyl groups; cyclohexenylethyl groups, vinyloxypropyl groups, etc.
- An alkenyl group-containing monovalent hydrocarbon group is exemplified, and a vinyl group is particularly preferred industrially.
- the properties of the alkenyl group-containing diorganopolysiloxane are preferably oily or raw rubbery.
- the alkenyl group-containing diorganopolysiloxane may be linear or branched.
- Component (C-2) is a crosslinking agent, and is an organohydrogenpolysiloxane containing hydrogen atoms (Si—H groups) bonded to two or more silicon atoms in one molecule.
- Component (C-2) is an organohydrogenpolysiloxane having at least 2, preferably 3 or more hydrogen atoms (SiH groups) bonded to a silicon atom in one molecule, and is linear, branched, or Annular ones can be used.
- the viscosity of the organohydrogenpolysiloxane (C-2) at 25 ° C. is preferably 1 to 5,000 mPa ⁇ s, more preferably 5 to 500 mPa ⁇ s.
- the organohydrogenpolysiloxane may be a mixture of two or more.
- the molar ratio of the Si—H group in the component (C-2) to the alkenyl group in the component (C-1) (SiH group / alkenyl group) is 0.3 to 10, particularly 1 It is preferable to blend in the range of 0.0 to 8.0. If the molar ratio between the SiH group and the alkenyl group is 0.3 or more, the crosslinking density does not decrease and the problem that the pressure-sensitive adhesive layer does not cure does not occur. If it is 10 or less, the crosslinking density does not become too high, and sufficient adhesive force and tack can be obtained. Moreover, if the said molar ratio is 10 or less, the usable time of a process liquid can be lengthened.
- Component (C-3) is a platinum-based catalyst (ie, a platinum group metal catalyst).
- a platinum-based catalyst ie, a platinum group metal catalyst.
- chloroplatinic acid an alcohol solution of chloroplatinic acid, a reaction product of chloroplatinic acid and alcohol, chloroplatinic acid and an olefin compound And a reaction product of chloroplatinic acid and a vinyl group-containing siloxane.
- the addition amount of the component (C-3) is an effective amount, and is usually the sum of (C-1) and (C-2) (when the component (C-4) shown below is contained, ), (C-2) and (C-4)), the platinum content (in terms of mass) is 1 to 5,000 ppm, preferably 5 to 2,000 ppm. If it is 1 ppm or more, the curability of the composition does not decrease, the crosslinking density does not decrease, and the holding power does not decrease. If it is 5,000 ppm or less, the usable time of a processing bath can be lengthened.
- Component (C-4) is a reaction control agent, and is used as necessary to prevent the treatment liquid from thickening or gelling before heat-curing when the composition is prepared or applied to a substrate. Can be optionally added.
- Specific examples include 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclohexanol, 3 -Methyl-3-trimethylsiloxy-1-butyne, 3-methyl-3-trimethylsiloxy-1-pentyne, 3,5-dimethyl-3-trimethylsiloxy-1-hexyne, 1-ethynyl-1-trimethylsiloxycyclohexane, Bis (2,2-dimethyl-3-butynoxy) dimethylsilane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,1,3,3-tetramethyl 1,3-divinyldisiloxane and the like, and 1-ethynylcyclohexanol and 3-methyl-1-butyne-3-o are preferable. It is.
- the blending amount is 0.1 to 10 parts by mass with respect to 100 parts by mass in total of the components (C-1) and (C-2). Is preferred.
- the amount is more preferably 0.1 to 8.0 parts by mass, particularly preferably 0.1 to 2.0 parts by mass. If it is 10 parts by mass or less, the curability of the composition does not decrease, and if it is 0.1 parts by mass or more, the effect of reaction control is sufficiently exhibited.
- thermosetting siloxane polymer layer (C) can be formed on a support by a method such as spin coating or roll coater.
- a method such as spin coating it is preferable to coat the resin as a solution.
- pentane, hexane, cyclohexane, isooctane, Hydrocarbon solvents such as nonane, decane, p-menthane, pinene, isododecane and limonene are preferably used.
- a known antioxidant can be added to the thermosetting siloxane polymer solution in order to improve heat resistance.
- thermosetting siloxane polymer layer (C) is preferably used by being formed with a film thickness of 0.1 to 30 ⁇ m, preferably 1.0 to 15 ⁇ m. If the film thickness is 0.1 ⁇ m or more, it can be applied to the whole without producing a portion that cannot be applied. On the other hand, if the film thickness is 30 ⁇ m or less, it can withstand the grinding process when forming a thin wafer. This is preferable.
- a filler such as silica may be added to the thermosetting siloxane polymer layer (C) in an amount of 50 parts by mass or less with respect to 100 parts by mass of the polymer layer (C). .
- thermosetting siloxane-modified polymer layer (B) is peel peel force after thermosetting when the thermosetting siloxane-modified polymer layer (B) laminated on the polymer (C) peels at the interface.
- it is 180 g peel strength of a 25 mm width test piece, usually 2 gf or more and 50 gf or less, preferably 3 gf or more and 30 gf or less, more preferably 5 gf or more and 20 gf or less. If it is 2 gf or more, there is no fear of wafer misalignment during wafer grinding, and if it is 50 gf or less, the wafer can be easily peeled off.
- non-reactive polyorganosiloxanes such as polydimethylsiloxane and polydimethyldiphenylsiloxane
- antioxidants such as phenol, quinone, amine, phosphorus, phosphite, sulfur and thioether
- triazole Light stabilizers such as benzophenone series
- flame retardants such as phosphate ester series, halogen series, phosphorus series, antimony series
- antistatic agents such as cationic activator, anionic activator, nonionic activator
- solvents for lowering viscosity aromatic solvents such as toluene and xylene, aliphatic solvents such as hexane, octane and isoparaffin, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone, and ester solvents
- thermoplastic organopolysiloxane polymer layer (A), a thermosetting siloxane-modified polymer layer (B) and a heat are used as an adhesive layer between a wafer having a semiconductor circuit and the support.
- a composite temporary adhesive layer composed of three layers of the curable siloxane polymer layer (C) is used.
- the thickness of the thin wafer obtained by the production method of the present invention is typically 5 to 300 ⁇ m, more typically 10 to 100 ⁇ m.
- the method for manufacturing a thin wafer according to the present invention includes steps (a) to (e). Further, steps (f) to (j) are included as necessary.
- Step (a) In the step (a), the circuit-forming surface of a wafer having a circuit-forming surface on the front surface and a non-circuit-forming surface on the back surface is formed on the thermoplastic organopolysiloxane polymer layer ( When joining to a support through a composite temporary adhesive layer comprising A), a thermosetting siloxane-modified polymer layer (B), and a thermosetting siloxane polymer layer (C), the support After forming the polymer layer (B) on the thermosetting siloxane polymer layer (C) formed thereon, the support on which the polymer layers (C) and (B) are formed, A step of bonding the wafer with a circuit with the polymer layer (A) formed thereon in a vacuum, or the formation of the polymer layer (B) on the wafer with a circuit with the polymer (A) formed Then, a wafer with a circuit on which the polymer layers (A) and (B) are formed, Serial polymer and a supporting body formed
- a wafer having a circuit formation surface and a circuit non-formation surface is a wafer in which one surface is a circuit formation surface and the other surface is a circuit non-formation surface.
- a wafer to which the present invention is applicable is usually a semiconductor wafer.
- the semiconductor wafer include not only a silicon wafer but also a germanium wafer, a gallium-arsenic wafer, a gallium-phosphorus wafer, a gallium-arsenic-aluminum wafer, and the like.
- the thickness of the wafer is not particularly limited, but is typically 600 to 800 ⁇ m, more typically 625 to 775 ⁇ m.
- a substrate such as a silicon wafer, a glass plate, or a quartz wafer can be used as the support, but there is no limitation.
- the support it is not necessary to irradiate the temporary adhesive layer through the support with radiant energy rays, and the support may not have light transmittance.
- the temporary adhesive layers (A), (B) and (C) are each a film and can be formed on a wafer or a support, or each solution is formed on a wafer or a support by a method such as spin coating. Can do. In this case, after spin coating, pre-baking is performed at a temperature of 80 to 200 ° C. according to the volatilization conditions of the solvent, and then used.
- the temporary adhesion layer (A) layer, the wafer on which the (B) layer and the (C) layer are formed, and the support are formed as a bonded substrate through the (A), (B) and (C) layers.
- the At this time preferably in the temperature range of 40 to 200 ° C., more preferably 60 to 180 ° C., the wafer is bonded to the support by uniformly pressing the substrate under reduced pressure at this temperature ( Laminate substrate) is formed.
- Examples of the wafer bonding apparatus include commercially available wafer bonding apparatuses such as EVG520IS and 850TB manufactured by EVG, and XBC300 manufactured by SUSS.
- the thermoplastic organopolysiloxane polymer layer (A) may be formed on the wafer with circuit and the peripheral portion may be removed.
- the polymer layer (A) is formed on a wafer with a circuit, the polymer is in a region from 0.1 mm to 10 mm, preferably from 0.5 mm to 5 mm, more preferably from 1 mm to 4 mm from the outer periphery of the wafer. It is preferable to provide a portion where the layer (A) is not formed.
- the portion where the polymer layer (A) is not formed is directly laminated with the thermosetting siloxane-modified polymer layer (B) and the wafer with circuit, and the risk of peeling during processing of the circuit wafer. Can be reduced. If the width of the region not to be formed is 0.1 mm or more, the wafer with a circuit and the polymer layer (B) are firmly adhered to each other, so that a sufficient peeling prevention effect is obtained. This is preferable because the number of chips that can be taken from the wafer increases.
- the polymer layer (A) is formed by applying a solution of a thermoplastic organopolysiloxane polymer to the wafer surface by a spin coat method. Later, there can be mentioned a method of performing an edge cut process and a method of performing an edge cut process simultaneously with spin coating.
- the edge-cut treatment method include a method of dissolving and removing the adhesion portion with a solvent (for example, isododecane), a method of mechanically forcibly removing, and the like.
- Step (b) is a step of thermosetting the polymer layers (B) and (C). After the wafer processed body (laminated body substrate) is formed, the polymer layer (by heating for 30 minutes to 2 hours at 120 to 220 ° C., preferably 150 to 200 ° C. for 10 minutes to 4 hours, B) and (C) are cured.
- the step (c) is a step of grinding or polishing the non-circuit-formed surface of the wafer bonded to the support, that is, grinding the wafer back surface side of the wafer processed body obtained by bonding in the step (a), This is a step of reducing the thickness of the wafer.
- the grinding is preferably performed while cooling the wafer and a grindstone (such as diamond) with water.
- Examples of the apparatus for grinding the back surface of the wafer include DAG-810 (trade name) manufactured by DISCO Corporation. Further, the back side of the wafer may be subjected to CMP polishing.
- Step (d) is a step of processing the wafer non-circuited surface of the non-circuit-formed surface, that is, the non-circuit-formed surface of the wafer processed body thinned by back surface grinding.
- This process includes various processes used at the wafer level. Examples include electrode formation, metal wiring formation, protective film formation, and the like.
- metal sputtering for forming electrodes, etc. wet etching for etching a metal sputtering layer, application of a resist to form a mask for forming a metal wiring, pattern formation by exposure and development, resist peeling
- Conventionally known processes such as dry etching, metal plating, silicon etching for TSV formation, and formation of an oxide film on the silicon surface can be mentioned.
- a wafer which has been thinned by back grinding by a method such as dicing can be cut into chips.
- Step (e) is a step of integrally peeling the support and the thermosetting siloxane polymer layer (C) laminated on the support from the wafer processed in step (d), that is, a thinned wafer.
- This peeling process is generally performed under a relatively low temperature condition of room temperature to about 60 ° C., one of the wafer and the support of the wafer processed body is fixed horizontally, and the other is attached at a certain angle from the horizontal direction. Examples thereof include a method of lifting, a method of attaching a protective film to the ground surface of the ground wafer, and peeling the wafer and the protective film from the wafer processed body by a peel method.
- peeling methods can be applied to the present invention.
- the method is not limited to the above method. These peeling methods are usually performed at room temperature.
- the process of peeling a support body and a polymer layer (C) from the wafer which gave said (e) process (G) bonding a dicing tape to the processed surface of the processed wafer; (H) a step of vacuum adsorbing the dicing tape surface to the adsorption surface; (I) It is preferable to include a step of peeling the support from the processed wafer at a temperature range of 10 ° C. to 100 ° C. by peel-off. By doing in this way, a support body can be easily peeled from the processed wafer, and a subsequent dicing process can be performed easily.
- thermosetting siloxane-modified polymer layer (B) is taped from the processed wafer. It is a process of peeling with a peel or the like.
- This peeling step is generally carried out at a relatively low temperature of about room temperature to about 60 ° C., the wafer processed body is fixed horizontally, and the exposed thermosetting siloxane-modified polymer layer (B) is peeled off.
- any tape material can be used as long as it can be peeled.
- a tape using a silicone adhesive material is particularly preferable.
- a polyester film adhesive tape No. 1 manufactured by Teraoka Seisakusho Co., Ltd. is available. 646S, no. 648 or the like is preferably used.
- the temporary adhesive layer (A) is formed on the wafer in the step (a)
- the temporary adhesive layer (B) may remain in that portion. Since the peripheral portion of the wafer is a region where good chips cannot be taken, there is no problem.
- thermosetting siloxane-modified polymer layer (B) after the step (f) of peeling the thermosetting siloxane-modified polymer layer (B) from the processed wafer, (J) It is preferable to perform a step of removing the temporary adhesive layer remaining on the circuit forming surface of the peeled wafer. A part of the temporary adhesive layer (A) may remain on the circuit forming surface of the wafer peeled off from the support in the step (f), and the removal of the temporary adhesive layer (A) is, for example, This can be done by cleaning the wafer.
- any cleaning solution that dissolves the thermoplastic organopolysiloxane polymer layer (A) in the temporary adhesive layer can be used.
- pentane examples include xane, cyclohexane, decane, isononane, p-menthane, pinene, isododecane, and limonene. These solvents may be used alone or in combination of two or more.
- bases and acids may be added to the solvent. Examples of bases that can be used include amines such as ethanolamine, diethanolamine, triethanolamine, triethylamine, and ammonia, and ammonium salts such as tetramethylammonium hydroxide.
- the acids organic acids such as acetic acid, oxalic acid, benzenesulfonic acid, and dodecylbenzenesulfonic acid can be used.
- the addition amount is 0.01 to 10% by mass, preferably 0.1 to 5% by mass in terms of the concentration in the cleaning solution.
- an existing surfactant may be added.
- a cleaning method a method of performing cleaning with a paddle using the above liquid, a cleaning method of spraying, and a method of immersing in a cleaning liquid tank are possible.
- the temperature is preferably 10 to 80 ° C., preferably 15 to 65 ° C. If necessary, the layer (A) is dissolved with these solutions, and finally washed with water or rinsed with alcohol, followed by drying treatment. Thus, a thin wafer can be obtained.
- the mixture was further aged at 80 ° C. for 2 hours, and then toluene was distilled off and 100 g of cyclohexanone was added to obtain a resin solution containing cyclohexanone having a resin solid content concentration of 40% by mass as a solvent.
- the weight average molecular weight was 45,000 in terms of polystyrene.
- EOCN-1020 manufactured by Nippon Kayaku Co., Ltd.
- BSDM bis ( tert-butylsulfonyl) diazomethane
- tetrakis [methylene- (3,5-di-tert-butyl-4-hydroxyhydrocinnamate)] methane (trade name: ADK STAB AO-) as an antioxidant 60) was added and filtered through a 0.2 ⁇ m membrane filter to obtain a resin solution (B-1).
- a solution composed of 80 parts by mass of polydimethylsiloxane having 0.5 mol% vinyl group in the molecular side chain and a number average molecular weight (Mn) of 30,000 and 400 parts by mass of isododecane is represented by the following formula (M-6). 3.0 parts of the organohydrogenpolysiloxane and 0.7 parts of ethynylcyclohexanol were added and mixed. Further, 0.5 part of platinum catalyst CAT-PL-5 (manufactured by Shin-Etsu Chemical Co., Ltd.) was added and filtered through a 0.2 ⁇ m membrane filter to obtain a thermosetting siloxane polymer solution (C-1). .
- thermosetting siloxane polymer solution C-2.
- thermosetting siloxane polymer solution (C-3).
- Examples 1 to 5 and Comparative Examples 1 to 3 After spin coating on a 200 mm diameter silicon wafer (thickness: 725 ⁇ m) having a copper post having a height of 10 ⁇ m and a diameter of 40 ⁇ m on the entire surface, it is heated on a hot plate at 180 ° C. for 5 minutes to obtain (A) The material corresponding to the layer was formed on the wafer bump forming surface with the film thickness shown in Table 1. In Examples 1 to 3, 5 and Comparative Example 3, after spin coating, the (A) layer on the wafer outer peripheral portion was edge-cut with a width shown in Table 1 using isododecane.
- a glass plate having a diameter of 200 mm (thickness: 500 ⁇ m) is used as a support, and the polymer solution corresponding to the layer (C) is first heated at 200 ° C. for 5 minutes by spin coating and hot plate.
- the film was formed on the glass support with the film thickness described in Table 1.
- the polymer solution corresponding to the (B) layer was spin-coated on the (C) layer formed on the glass support, so that the film thickness shown in Table 1 was formed. After that, it was heated on a hot plate at 150 ° C. for 3 minutes.
- the plates were bonded to each other under the conditions shown in Table 1 in a vacuum bonding apparatus so that the resin surfaces were matched, and a laminate was produced (crimping conditions).
- a glass plate is used as a support in order to visually discriminate abnormalities after substrate adhesion, but a substrate such as a wafer that does not transmit light can also be used.
- the 200 mm wafer bonding was performed using a wafer bonding apparatus EVG520IS manufactured by EVG.
- the bonding temperature was the value shown in Table 1, the pressure in the chamber during bonding was 10 ⁇ 3 mbar or less, and the load was 5 kN.
- the layers (B) and (C) are cured, then cooled to room temperature, and the subsequent interface is visually confirmed.
- the abnormality such as bubbles at the interface did not occur, it was evaluated as “good” and indicated as “ ⁇ ”, and when the abnormality occurred, it was evaluated as “bad” and indicated as “x”.
- Examples 2 to 4 and Comparative Example 3 after the back surface grinding was performed, the wafer that was back ground by a dicer (manufactured by DISCO) was subjected to a dicing process. Dicing was performed with a chip size of 10 mm ⁇ 10 mm and a depth that was cut to the middle between the back-ground grinding wafer and the (A) layer and the (B) layer, and the (C) layer and the support were not cut. Those subjected to the dicing process are shown in Table 1 with and without dicing.
- -Support peelability test The peelability of the support was evaluated by the following method. First, a dicing tape was attached to the processed surface (circuit non-formed surface) side of the wafer thinned to 50 ⁇ m after completion of the heat resistance test using a dicing frame, and this dicing tape surface was set on an adsorption plate by vacuum suction. Thereafter, the glass substrate was peeled off by lifting one point of the glass with tweezers at room temperature. A case where the 50 ⁇ m wafer could be peeled without being broken was indicated by “ ⁇ ”, and a case where an abnormality such as a crack occurred was evaluated as defective and indicated by “X”.
- the tape peel peel test was performed by the following method. First, the wafer after the support peelability test was set on the suction plate by vacuum suction of the dicing tape surface. Thereafter, polyester film adhesive tape No. The polymer layer (B) was peeled from the wafer by attaching 648 to the polymer layer (B) exposed on the surface and performing tape peel peeling. A case where the 50 ⁇ m wafer could be peeled without being broken was indicated by “ ⁇ ”, and a case where an abnormality such as a crack occurred was evaluated as defective and indicated by “X”.
- a polymer layer (C) was formed on a silicon wafer as a support under the same conditions as those prepared in the above examples and comparative examples, and after the polymer layer (B) was formed thereon, 150 mm long ⁇ 25 mm wide 5 polyimide tapes were affixed, and the portion (B) where the tape was not stretched was removed. Using an AUTOGRAPH (AG-1) manufactured by Shimadzu Corporation, the tape was peeled off at 120 ° by 180 ° peeling from one end of the tape. .
- Examples 1 to 5 satisfying the requirements of the present invention temporary adhesion and peeling are easy, and in particular, dicing before peeling can be performed without causing chip jumping or the like from Examples 2 to 4. It can be seen that even if the thin wafer before peeling is cut, it can be easily peeled off. In addition, since the peel peeling force of Examples 1 to 5 is 5 to 40 gf, there is no possibility that the wafer will be displaced during grinding of the wafer.
- Comparative Example 1 although the layer (A) was not applied in Example 1, the layer (B) remaining on the polished wafer could not be tape peeled. Moreover, although the comparative example 2 was a case where the (B) layer was not apply
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
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Abstract
Description
前記仮接着材層が、前記ウエハの表面に剥離可能に接着された熱可塑性オルガノポリシロキサン重合体層(A)からなる第一仮接着層と、該第一仮接着層に剥離可能に積層された熱硬化性シロキサン変性重合体層(B)からなる第二仮接着層と、該第二仮接着層に剥離可能に積層され、前記支持体に剥離可能に接着された熱硬化性シロキサン重合体層(C)からなる第三仮接着層との3層構造を有する複合仮接着材層を備えたものであることを特徴とするウエハ加工体を提供する。
前記ウエハの表面に剥離可能に接着可能な熱可塑性オルガノポリシロキサン重合体層(A)からなる第一仮接着層と、該第一仮接着層に剥離可能に積層された熱硬化性シロキサン変性重合体層(B)からなる第二仮接着層と、該第二仮接着層に剥離可能に積層され、前記支持体に剥離可能に接着可能な熱硬化性シロキサン重合体層(C)からなる第三仮接着層の3層構造を有する複合仮接着材層を備えたものであることを特徴とするウエハ加工用仮接着材を提供する。
(C-1)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン、
(C-2)1分子中に2個以上のケイ素原子に結合した水素原子(Si-H基)を含有するオルガノハイドロジェンポリシロキサン:前記(C-1)成分中のアルケニル基に対する(C-2)成分中のSi-H基のモル比が0.3から10となる量、
(C-3)白金系触媒、
を含有する組成物の硬化物層であることが好ましい。
を含有するものであることが好ましい。
(b)前記重合体層(B)及び(C)を熱硬化させる工程と、
(c)前記支持体と接合した前記ウエハの回路非形成面を研削又は研磨する工程と、
(d)前記ウエハの回路非形成面に加工を施す工程と、
(e)前記加工を施したウエハから前記支持体と前記支持体に積層された前記熱硬化性シロキサン重合体層(C)を一体で剥離する工程と、
(f)前記工程(e)を行った後のウエハから前記熱硬化性シロキサン変性重合体層(B)を剥離する工程と、
を含むことを特徴とする薄型ウエハの製造方法を提供する。
(b)前記重合体層(B)及び(C)を熱硬化させる工程と、
(c)前記支持体と接合した前記ウエハの回路非形成面を研削又は研磨する工程と、
(d)前記ウエハの回路非形成面に加工を施す工程と、
(e)前記加工を施したウエハから前記支持体と前記支持体に積層された前記熱硬化性シロキサン重合体層(C)を一体で剥離する工程と、
(f)前記工程(e)を行った後のウエハから前記熱硬化性シロキサン変性重合体層(B)を剥離する工程と、
を含むことを特徴とする薄型ウエハの製造方法を提供する。
上記のように、仮接着が容易であり、かつ、高段差基板の均一な膜厚での形成も可能であり、TSV形成、ウエハ裏面配線工程に対する工程適合性が高く、更には、CVDといったウエハ熱プロセス耐性に優れ、剥離前の薄型ウエハが切断された状態であっても容易に剥離可能で、薄型ウエハの生産性を高めることができるウエハ加工体及びウエハ加工用仮接着材が求められている。
(A)の熱可塑性オルガノポリシロキサン重合体層からなる熱可塑性仮接着層と
(B)の熱硬化性シロキサン変性重合体層からなる熱硬化性仮接着層と、さらには、
(C)の熱硬化性シロキサン重合体層からなる熱硬化性仮接着層
との3層系を有する仮接着材層を、ウエハと支持体の接合にウエハ側から(A)、(B)、(C)の順で形成した構造として使用することで、貫通電極構造や、バンプ接続構造を有する薄型ウエハを、簡単に製造する方法を見出した。
-第一仮接着層(A)/熱可塑性オルガノポリシロキサン重合体層-
第一仮接着層は、熱可塑性のオルガノポリシロキサン重合体から構成される。熱可塑性のオルガノポリシロキサン重合体としては、例えば、R11R12SiO2/2で表されるシロキサン単位(D単位)を99.000~99.999モル%、好ましくは99.500~99.999モル%、R13R14R15SiO1/2で表されるシロキサン単位(M単位)を1.000~0.001モル%、好ましくは0.500~0.001モル%、R16SiO3/2で表されるシロキサン単位(T単位)を0.000~0.500モル%、好ましくは0.000~0.100モル%含有し、かつ重量平均分子量が200,000~1,000,000で、更には分子量740以下の低分子量成分が0.5質量%以下である非反応性オルガノポリシロキサンが挙げられる。
本発明のウエハ加工体及びウエハ加工用仮接着材の構成要素である熱硬化性シロキサン変性重合体層(B)は、熱硬化性シロキサン変性重合体層であれば特に限定されないが、下記一般式(1)あるいは(3)で示される熱硬化性シロキサン変性重合体を主成分とする熱硬化性組成物の硬化物の層が好ましい。
一般式(1)の重合体(フェノール性シロキサン重合体):
下記一般式(1)で示される繰り返し単位を有する重量平均分子量が3,000~500,000、好ましくは10,000~100,000のシロキサン結合含有重合体(フェノール基含有オルガノシロキサン結合含有高分子化合物)。
下記一般式(3)で示される繰り返し単位を有する重量平均分子量が3,000~500,000のシロキサン結合含有重合体(エポキシ基含有シリコーン高分子化合物)。
本発明のウエハ加工体及びウエハ加工用仮接着材の構成要素である熱硬化性シロキサン重合体層(C)は、熱硬化性のシロキサン重合体からなるものであれば、特に限定されない。例えば、下記(C-1)~(C-3)成分、必要に応じて(C-4)成分を含有する組成物の硬化物層であることが好ましい。
(C-1)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン、
(C-2)1分子中に2個以上のケイ素原子に結合した水素原子(Si-H基)を含有するオルガノハイドロジェンポリシロキサン:(C-1)成分中のアルケニル基に対する(C-2)成分中のSi-H基のモル比が0.3から10となる量、
(C-3)白金系触媒。
を含有するものであることが好ましい。
[(C-1)成分]
(C-1)成分は、1分子中に2個以上のアルケニル基を有するオルガノポリシロキサンである。(C-1)成分は、好ましくは、1分子中に2個以上のアルケニル基を含有する直鎖状又は分岐状のジオルガノポリシロキサンである。特に好ましくは、1分子中に0.6mol%(アルケニル基モル数/Siモル数)~9mol%のアルケニル基を含有するジオルガノポリシロキサンである。
R9 (3-a)XaSiO-(R9XSiO)m-(R9 2SiO)n-SiR9 (3-a)Xa…(5)
R9 2(HO)SiO-(R9XSiO)m+2-(R9 2SiO)n-SiR9 2(OH)…(6)
(式中、R9は夫々独立して脂肪族不飽和結合を有さない1価炭化水素基、Xは夫々独立してアルケニル基含有1価有機基、aは0~3の整数である。また、式(5)において、2a+mは1分子中にアルケニル基含有量が0.6~9mol%となる数である。式(6)において、m+2は1分子中にアルケニル基含有量が0.6~9mol%となる数である。)
(C-2)成分は架橋剤であり、1分子中に2個以上のケイ素原子に結合した水素原子(Si-H基)を含有するオルガノハイドロジェンポリシロキサンである。(C-2)成分は、1分子中にケイ素原子に結合した水素原子(SiH基)を少なくとも2個、好ましくは3個以上有するオルガノハイドロジェンポリシロキサンであり、直鎖状、分岐状、又は環状のものを使用できる。
(C-3)成分は白金系触媒(即ち、白金族金属触媒)であり、例えば、塩化白金酸、塩化白金酸のアルコール溶液、塩化白金酸とアルコールとの反応物、塩化白金酸とオレフィン化合物との反応物、塩化白金酸とビニル基含有シロキサンとの反応物などが挙げられる。
(C-4)成分は反応制御剤であり、組成物を調合ないし基材に塗工する際に、加熱硬化前に処理液が増粘やゲル化を起こさないようにするために必要に応じて任意に添加するものである。
本発明のウエハ加工用仮接着材には、上記各成分以外に任意成分を添加することができる。例えば、ポリジメチルシロキサン、ポリジメチルジフェニルシロキサンなどの非反応性のポリオルガノシロキサン;フェノール系、キノン系、アミン系、リン系、ホスファイト系、イオウ系、チオエーテル系などの酸化防止剤;トリアゾール系、ベンゾフェノン系などの光安定剤;リン酸エステル系、ハロゲン系、リン系、アンチモン系などの難燃剤;カチオン活性剤、アニオン活性剤、非イオン系活性剤などの帯電防止剤;塗工の際の粘度を下げるための溶剤として、トルエン、キシレン等の芳香族系溶剤、ヘキサン、オクタン、イソパラフィンなどの脂肪族系溶剤、メチルエチルケトン、メチルイソブチルケトンなどのケトン系溶剤、酢酸エチル、酢酸イソブチルなどのエステル系溶剤、ジイソプロピルエーテル、1,4-ジオキサンなどのエーテル系溶剤、又はこれらの混合溶剤などが使用される。
本発明の薄型ウエハの製造方法は、半導体回路等を有するウエハと支持体との接着層として、熱可塑性オルガノポリシロキサン重合体層(A)、熱硬化性シロキサン変性重合体層(B)と熱硬化性シロキサン重合体層(C)の3層とからなる複合仮接着材層を用いることを特徴とする。本発明の製造方法により得られる薄型ウエハの厚さは、典型的には5~300μm、より典型的には10~100μmである。
工程(a)は、表面に回路形成面及び裏面に回路非形成面を有するウエハの前記回路形成面を、上記本発明のウエハ加工用仮接着材に用いられる熱可塑性オルガノポリシロキサン重合体層(A)と、熱硬化性シロキサン変性重合体層(B)と、熱硬化性シロキサン重合体層(C)とからなる複合仮接着材層を介して、支持体に接合する際に、前記支持体上に形成された前記熱硬化性シロキサン重合体層(C)の上に前記重合体層(B)を形成した後、該重合体層(C)と(B)の形成された支持体と、前記重合体層(A)の形成された回路付きウエハとを真空下で貼り合わせる工程、または、前記重合体(A)の形成された回路付きウエハの上に前記重合体層(B)を形成した後、該重合体層(A)と(B)の形成された回路付きウエハと、前記重合体(C)の形成された支持体とを真空下で貼り合わせる工程である。
工程(b)は、前記重合体層(B)及び(C)を熱硬化させる工程である。上記ウエハ加工体(積層体基板)が形成された後、120~220℃、好ましくは150~200℃で10分~4時間、好ましくは30分~2時間加熱することによって、前記重合体層(B)及び(C)の硬化を行う。
工程(c)は、支持体と接合したウエハの回路非形成面を研削又は研磨する工程、即ち、工程(a)にて貼り合わせて得られたウエハ加工体のウエハ裏面側を研削して、該ウエハの厚みを薄くしていく工程である。ウエハ裏面の研削加工の方式には特に制限はなく、公知の研削方式が採用される。研削は、ウエハと砥石(ダイヤモンド等)に水をかけて冷却しながら行うことが好ましい。ウエハ裏面を研削加工する装置としては、例えば(株)ディスコ製DAG-810(商品名)等が挙げられる。また、ウエハ裏面側をCMP研磨してもよい。
工程(d)は、回路非形成面を研削したウエハ加工体、即ち、裏面研削によって薄型化されたウエハ加工体の回路非形成面に加工を施す工程である。この工程にはウエハレベルで用いられる様々なプロセスが含まれる。例としては、電極形成、金属配線形成、保護膜形成等が挙げられる。より具体的には、電極等の形成のための金属スパッタリング、金属スパッタリング層をエッチングするウェットエッチング、金属配線形成のマスクとするためのレジストの塗布、露光、及び現像によるパターンの形成、レジストの剥離、ドライエッチング、金属めっきの形成、TSV形成のためのシリコンエッチング、シリコン表面の酸化膜形成など、従来公知のプロセスが挙げられる。またこれ以外に、ダイシング等の方法により裏面研削され薄型化したウエハをチップサイズに切断することもできる。
工程(e)は、工程(d)で加工を施したウエハから支持体及びこの支持体に積層された熱硬化性シロキサン重合体層(C)を一体に剥離する工程、即ち、薄型化したウエハに様々な加工を施した後、ウエハ加工体から、支持体及び重合体層(C)を剥離する工程である。この剥離工程は、一般に室温から60℃程度の比較的低温の条件で実施され、ウエハ加工体のウエハ又は支持体の一方を水平に固定しておき、他方を水平方向から一定の角度を付けて持ち上げる方法、及び、研削されたウエハの研削面に保護フィルムを貼り、ウエハと保護フィルムをピール方式でウエハ加工体から剥離する方法等が挙げられる。
(g)加工を施したウエハの加工面にダイシングテープを接着する工程と、
(h)ダイシングテープ面を吸着面に真空吸着する工程と、
(i)吸着面の温度が10℃から100℃の温度範囲で、前記支持体を、加工を施した前記ウエハからピールオフにて剥離する工程と、を含むことが好ましい。このようにすることで、支持体を、加工を施したウエハから容易に剥離することができ、また、後のダイシング工程を容易に行うことができる。
工程(f)は、(e)で前記支持体及び前記熱硬化性シロキサン重合体層(C)を剥離した後、加工を施したウエハから前記熱硬化性シロキサン変性重合体層(B)をテープピール等により剥離する工程である。
(j)剥離したウエハの回路形成面に残存する仮接着材層を除去する工程を行うこと好ましい。前記工程(f)により支持体より剥離されたウエハの回路形成面には、仮接着層(A)が一部残存している場合があり、該仮接着層(A)の除去は、例えば、ウエハを洗浄することにより行うことができる。
4つ口フラスコにオクタメチルシクロテトラシロキサン1,000g(3.38モル)及びヘキサメチルジシロキサン0.24g(0.0015モル)を仕込み、温度を110℃に保った。次いで、これに10質量%テトラブチルホスホニウムハイドロオキサイドシリコネート4gを加え、4時間かけて重合した後、160℃で2時間、後処理を行って、ジメチルポリシロキサンを得た。
このジメチルポリシロキサンを29Si-NMR法でD単位とM単位の割合を調べたところ、D単位99.978%、M単位0.022%で、おおよそ重合度9,000の下記構造のジメチルポリシロキサンと同定された。
なお、重量平均分子量は、GPCにより測定した。
4つ口フラスコにオクタメチルシクロテトラシロキサン1,000g(3.38モル)及びトリス(トリメチルシロキシ)メチルシラン0.93g(0.003モル)を仕込み、温度を110℃に保った。次いで、これに10質量%テトラブチルホスホニウムハイドロオキサイドシリコネート4gを加え、4時間かけて重合した後、160℃で2時間、後処理を行って、ジメチルポリシロキサンを得た。
このジメチルポリシロキサンを29Si-NMR法でD単位、M単位、T単位のそれぞれの割合を調べたところ、D単位99.911%、M単位0.067%、T単位0.022%であり、下記構造の分岐状ジメチルポリシロキサンと同定された。
撹拌機、温度計、窒素置換装置及び還流冷却器を具備したフラスコ内に9,9’-ビス(3-アリル-4-ヒドロキシフェニル)フルオレン(M-1)43.1g、平均構造式(M-3)で示されるオルガノハイドロジェンシロキサン29.5g、トルエン135g、塩化白金酸0.04gを仕込み、80℃に昇温した。その後、1,4-ビス(ジメチルシリル)ベンゼン(M-5)17.5gを1時間掛けてフラスコ内に滴下した。このとき、フラスコ内温度は、85℃まで上昇した。滴下終了後、更に80℃で2時間熟成した後、トルエンを留去すると共に、シクロヘキサノンを100g添加して、樹脂固形分濃度40質量%のシクロヘキサノンを溶剤とする樹脂溶液を得た。この溶液の樹脂分の分子量をGPCにより測定すると、ポリスチレン換算で重量平均分子量45,000であった。更に、この樹脂溶液50gに、架橋剤としてエポキシ架橋剤であるEOCN-1020(日本化薬(株)製)を7.5g、硬化触媒として、和光純薬工業(株)製、BSDM(ビス(tert-ブチルスルホニル)ジアゾメタン)を0.2g、さらに、酸化防止剤として、テトラキス[メチレン-(3,5-ジ-t-ブチル-4-ヒドロキシハイドロシンナメート)]メタン(商品名:アデカスタブ AO-60)を0.1g添加し、0.2μmのメンブレンフィルターで濾過して、樹脂溶液(B-1)を得た。
撹拌機、温度計、窒素置換装置及び還流冷却器を具備した5Lフラスコ内にエポキシ化合物(M-2)84.1gをトルエン600gに溶解後、化合物(M-3)294.6g、化合物(M-4)25.5gを加え、60℃に加温した。その後、カーボン担持白金触媒(5質量%)1gを投入し、内部反応温度が65~67℃に昇温するのを確認後、更に、90℃まで加温し、3時間熟成した。次いで室温まで冷却後、メチルイソブチルケトン(MIBK)600gを加え、本反応溶液をフィルターにて加圧濾過することで白金触媒を取り除いた。この樹脂溶液中の溶剤を減圧留去すると共に、プロピレングリコールモノメチルエーテルアセテート(PGMEA)270gを添加して、固形分濃度65質量%のPGMEAを溶剤とする樹脂溶液を得た。この樹脂溶液中の樹脂の分子量をGPCにより測定すると、ポリスチレン換算で重量平均分子量28,000であった。更にこの樹脂溶液100gに4官能フェノール化合物であるTEP-TPA(旭有機材工業製)を9g、テトラヒドロ無水フタル酸(新日本理化(株)製、リカシッドHH-A)0.2gを添加して、0.2μmのメンブレンフィルターで濾過して、樹脂溶液(B-2)を得た。
0.5モル%のビニル基を分子側鎖に有し、数平均分子量(Mn)が3万のポリジメチルシロキサン80質量部およびイソドデカン400質量部からなる溶液に下記式(M-6)で示されるオルガノハイドロジェンポリシロキサンを3.0部、エチニルシクロヘキサノール0.7部を添加し混合した。さらに白金触媒CAT-PL-5(信越化学工業株式会社製)を0.5部添加し、0.2μmのメンブレンフィルターで濾過して、熱硬化性シロキサン重合体溶液(C-1)を得た。
0.5モル%のビニル基を分子側鎖に有し、数平均分子量(Mn)が3万のポリジメチルシロキサン60質量部、および0.15モル%のビニル基を両末端鎖に有し、数平均分子量(Mn)が6万のポリジメチルシロキサン20質量部およびイソドデカン400質量部からなる溶液に(M-6)で示されるオルガノハイドロジェンポリシロキサンを2.5部、エチニルシクロヘキサノール0.7部を添加し混合した。さらに白金触媒CAT-PL―5(信越化学工業株式会社製)を0.5部添加し、0.2μmのメンブレンフィルターで濾過して、熱硬化性シロキサン重合体溶液(C-2)を得た。
0.5モル%のビニル基を分子側鎖に有し、数平均分子量(Mn)が3万のポリジメチルシロキサン40質量部、および0.15モル%のビニル基を両末端鎖に有し、数平均分子量(Mn)が6万のポリジメチルシロキサン40質量部およびイソドデカン400質量部からなる溶液に(M-6)で示されるオルガノハイドロジェンポリシロキサンを2.0部、エチニルシクロヘキサノール0.7部を添加し混合した。さらに白金触媒CAT-PL―5(信越化学工業株式会社製)を0.5部添加し、0.2μmのメンブレンフィルターで濾過して、熱硬化性シロキサン重合体溶液(C-3)を得た。
表面に高さ10μm、直径40μmの銅ポストが全面に形成された直径200mmシリコンウエハ(厚さ:725μm)にスピンコート後、ホットプレートにて、180℃で5分間加熱することにより、(A)層に対応する材料を表1に示す膜厚で、ウエハバンプ形成面に成膜した。なお実施例1~3、5、比較例3については、スピンコート後に、イソドデカンを用いて、ウエハ外周部の(A)層を表1に示す幅でエッジカット処理した。一方、直径200mm(厚さ:500μm)のガラス板を支持体とし、この支持体にまず(C)層に対応する重合体溶液をスピンコート、およびホットプレートにより、200℃で5分間加熱することで、表1中に記載された膜厚で、ガラス支持体上に形成した。その後、(B)層に相当する重合体溶液を、ガラス支持体上に形成された(C)層上に、やはりスピンコートすることで、表1中の膜厚で形成した。さらにその後、150℃で3分間、ホットプレート上で加熱した。このようにしてこの熱可塑性オルガノポリシロキサン重合体層(A)を有するシリコンウエハ及び、熱硬化性シロキサン重合体からなる(C)層と、その(C)層上に(B)層を有するガラス板とをそれぞれ、樹脂面が合わされるように、真空貼り合わせ装置内で表1に示す条件にて貼り合わせ、積層体を作製した(圧着条件)。
200mmのウエハ接合は、EVG社のウエハ接合装置EVG520ISを用いて行った。接合温度は表1に記載の値、接合時のチャンバー内圧力は10-3mbar以下、荷重は5kNで実施した。接合後、一旦、180℃で1時間オーブンを用いて基板を加熱し、(B)層及び(C)層の硬化を実施したのち、室温まで冷却し、その後の界面の接着状況を目視で確認し、界面での気泡などの異常が発生しなかった場合を良好と評価して「○」で示し、異常が発生した場合を不良と評価して「×」で示した。
グラインダー(DISCO製、DAG810)でダイヤモンド砥石を用いてシリコンウエハの裏面研削を行った。最終基板厚50μmまでグラインドした後、光学顕微鏡(100倍)にてクラック、剥離等の異常の有無を調べた。異常が発生しなかった場合を良好と評価して「○」で示し、異常が発生した場合を不良と評価して「×」で示した。
シリコンウエハを裏面研削した後の積層体を窒素雰囲気下の200℃オーブンに2時間入れた後、260℃のホットプレート上で10分加熱した後の外観異常の有無を調べた。外観異常が発生しなかった場合を良好と評価して「○」で示し、わずかなウエハのゆがみが見られるものの、ボイド発生や、ウエハ膨れ、あるいはウエハ破損等の異常がなかった場合を概ね良好と評価して「△」、ボイド、ウエハ膨れ、ウエハ破損等の外観異常が発生した場合を不良と評価して「×」で示した。
支持体の剥離性は、以下の方法で評価した。まず、耐熱性試験終了後の50μmまで薄型化したウエハの加工面(回路非形成面)側にダイシングフレームを用いてダイシングテープを貼り、このダイシングテープ面を真空吸着によって、吸着板にセットした。その後、室温にて、ガラスの1点をピンセットにて持ち上げることで、ガラス基板を剥離した。50μmのウエハを割ることなく剥離できた場合を「○」で示し、割れなどの異常が発生した場合を不良と評価して「×」で示した。
テープピール剥離性試験は、以下の方法で行った。まず、支持体剥離性試験まで終えたウエハを、引き続きダイシングテープ面を真空吸着によって、吸着版にセットした。その後、(株)寺岡製作所製ポリエステルフィルム粘着テープNo.648を表面に露出した重合体層(B)に貼り、テープピール剥離を行うことでウエハから重合体層(B)を剥離した。50μmのウエハを割ることなく剥離できた場合を「○」で示し、割れなどの異常が発生した場合を不良と評価して「×」で示した。
上記テープピール剥離性試験終了後のダイシングテープを介してダイシングフレームに装着された200mmウエハ(耐熱性試験条件に晒されたもの)を、接着層を上にしてスピンコーターにセットし、洗浄溶剤としてイソノナンを3分間噴霧したのち、ウエハを回転させながらイソプロピルアルコール(IPA)を噴霧にてリンスを行った。その後、外観を観察して残存する接着材樹脂の有無を目視でチェックした。樹脂の残存が認められないものを良好と評価して「○」で示し、樹脂の残存が認められたものを不良と評価して「×」で示した。
支持体としてシリコンウエハ上に上記実施例及び比較例で作製したのと同じ条件で重合体層(C)を形成し、その上に重合体層(B)を形成した後、150mm長×25mm幅のポリイミドテープを5本貼り付け、テープが張られていない部分の(B)層を除去した。島津製作所社のAUTOGRAPH(AG-1)を用いてテープの一端から180°剥離で120mm剥がし、そのときにかかる力の平均(120mmストローク×5回)を、その仮接着層のピール剥離力とした。
Claims (19)
- 支持体上に仮接着材層が形成され、かつ仮接着材層上に、表面に回路面を有し、裏面を加工すべきウエハが積層されてなるウエハ加工体であって、
前記仮接着材層が、前記ウエハの表面に剥離可能に接着された熱可塑性オルガノポリシロキサン重合体層(A)からなる第一仮接着層と、該第一仮接着層に剥離可能に積層された熱硬化性シロキサン変性重合体層(B)からなる第二仮接着層と、該第二仮接着層に剥離可能に積層され、前記支持体に剥離可能に接着された熱硬化性シロキサン重合体層(C)からなる第三仮接着層との3層構造を有する複合仮接着材層を備えたものであることを特徴とするウエハ加工体。 - 前記熱可塑性オルガノポリシロキサン重合体層(A)が、R11R12SiO2/2で表されるシロキサン単位(D単位)を99.000~99.999モル%、R13R14R15SiO1/2で表されるシロキサン単位(M単位)を1.000~0.001モル%、R16SiO3/2で表されるシロキサン単位(T単位)を0.000~0.500モル%含有し(但し、R11、R12、R13、R14、R15、R16はそれぞれ非置換又は置換の1価炭化水素基を示す。)、かつ重量平均分子量が200,000~1,000,000で、更には分子量740以下の低分子量成分が0.5質量%以下である非反応性オルガノポリシロキサン層であることを特徴とする請求項1に記載のウエハ加工体。
- 前記熱硬化性シロキサン変性重合体層(B)が、下記一般式(1)で示される繰り返し単位を有する重量平均分子量が3,000~500,000のシロキサン結合含有重合体100質量部に対して、架橋剤としてホルマリン又はホルマリン-アルコールにより変性されたアミノ縮合物、メラミン樹脂、尿素樹脂、1分子中に平均して2個以上のメチロール基又はアルコキシメチロール基を有するフェノール化合物、及び1分子中に平均して2個以上のエポキシ基を有するエポキシ化合物から選ばれるいずれか1種以上を0.1~50質量部含有する組成物の硬化物層であることを特徴とする請求項1又は請求項2に記載のウエハ加工体。
- 前記熱硬化性シロキサン変性重合体層(B)が、下記一般式(3)で示される繰り返し単位を有する重量平均分子量が3,000~500,000のシロキサン結合含有重合体100質量部に対して、架橋剤として1分子中に平均して2個以上のフェノール基を有するフェノール化合物、及び1分子中に平均して2個以上のエポキシ基を有するエポキシ化合物から選ばれるいずれか1種以上を0.1~50質量部含有する組成物の硬化物層であることを特徴とする請求項1又は請求項2に記載のウエハ加工体。
- 前記熱硬化性シロキサン重合体層(C)が、
(C-1)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン、
(C-2)1分子中に2個以上のケイ素原子に結合した水素原子(Si-H基)を含有するオルガノハイドロジェンポリシロキサン:前記(C-1)成分中のアルケニル基に対する(C-2)成分中のSi-H基のモル比が0.3から10となる量、
(C-3)白金系触媒、
を含有する組成物の硬化物層であることを特徴とする請求項1から請求項4のいずれか1項に記載のウエハ加工体。 - 前記熱硬化性シロキサン重合体層(C)が、更に、(C-4)成分として反応制御剤:前記(C-1)および前記(C-2)成分の合計100質量部に対して0.1から10質量部、
を含有するものであることを特徴とする請求項5に記載のウエハ加工体。 - 前記熱硬化性シロキサン重合体層(C)に積層された前記熱硬化性シロキサン変性重合体層(B)の前記重合体層(C)から界面剥離する際の熱硬化後におけるピール剥離力が、25mm幅の試験片の180°ピール剥離力で2gf以上50gf以下であることを特徴とする請求項1から請求項6のいずれか1項に記載のウエハ加工体。
- 前記熱可塑性オルガノポリシロキサン重合体層(A)が、前記ウエハの表面に部分的に形成され、剥離可能に接着されたものであることを特徴とする請求項1から請求項7のいずれか1項に記載のウエハ加工体。
- (a)表面に回路形成面及び裏面に回路非形成面を有するウエハの前記回路形成面を、請求項1から請求項8のいずれか1項に記載のウエハ加工体に用いられる前記熱可塑性オルガノポリシロキサン重合体層(A)と、前記熱硬化性シロキサン変性重合体層(B)と、前記熱硬化性シロキサン重合体層(C)とからなる複合仮接着材層を介して、支持体に接合する際に、前記支持体上に形成された前記熱硬化性シロキサン重合体層(C)の上に前記熱硬化性シロキサン変性重合体層(B)を形成した後、該重合体層(C)と(B)の形成された支持体と、前記重合体層(A)の形成された回路付きウエハとを真空下で貼り合わせる工程と、
(b)前記重合体層(B)及び(C)を熱硬化させる工程と、
(c)前記支持体と接合した前記ウエハの回路非形成面を研削又は研磨する工程と、
(d)前記ウエハの回路非形成面に加工を施す工程と、
(e)前記加工を施したウエハから前記支持体と前記支持体に積層された前記熱硬化性シロキサン重合体層(C)を一体で剥離する工程と、
(f)前記工程(e)を行った後のウエハから前記熱硬化性シロキサン変性重合体層(B)を剥離する工程と、
を含むことを特徴とする薄型ウエハの製造方法。 - (a)表面に回路形成面及び裏面に回路非形成面を有するウエハの前記回路形成面を、請求項1から請求項8のいずれか1項に記載のウエハ加工体に用いられる前記熱可塑性オルガノポリシロキサン重合体層(A)と、前記熱硬化性シロキサン変性重合体層(B)と、前記熱硬化性シロキサン重合体層(C)とからなる複合仮接着材層を介して、支持体に接合する際に、前記回路付きウエハ上に形成された前記熱可塑性オルガノポリシロキサン重合体層(A)の上に前記熱硬化性シロキサン変性重合体層(B)を形成した後、該重合体層(A)と(B)の形成された回路付ウエハと、前記熱硬化性シロキサン重合体層(C)の形成された支持体とを真空下で貼り合わせる工程と、
(b)前記重合体層(B)及び(C)を熱硬化させる工程と、
(c)前記支持体と接合した前記ウエハの回路非形成面を研削又は研磨する工程と、
(d)前記ウエハの回路非形成面に加工を施す工程と、
(e)前記加工を施したウエハから前記支持体と前記支持体に積層された前記熱硬化性シロキサン重合体層(C)を一体で剥離する工程と、
(f)前記工程(e)を行った後のウエハから前記熱硬化性シロキサン変性重合体層(B)を剥離する工程と、
を含むことを特徴とする薄型ウエハの製造方法。 - 前記工程(a)において、前記回路付きウエハ上に前記熱可塑性オルガノポリシロキサン重合体層(A)を形成するとともに、周辺部を除去することを特徴とする請求項9又は請求項10に記載の薄型ウエハの製造方法。
- 表面に回路面を有し、裏面を加工すべきウエハを支持体に仮接着するためのウエハ加工用仮接着材であって、
前記ウエハの表面に剥離可能に接着可能な熱可塑性オルガノポリシロキサン重合体層(A)からなる第一仮接着層と、該第一仮接着層に剥離可能に積層された熱硬化性シロキサン変性重合体層(B)からなる第二仮接着層と、該第二仮接着層に剥離可能に積層され、前記支持体に剥離可能に接着可能な熱硬化性シロキサン重合体層(C)からなる第三仮接着層の3層構造を有する複合仮接着材層を備えたものであることを特徴とするウエハ加工用仮接着材。 - 前記熱可塑性オルガノポリシロキサン重合体層(A)が、R11R12SiO2/2で表されるシロキサン単位(D単位)を99.000~99.999モル%、R13R14R15SiO1/2で表されるシロキサン単位(M単位)を1.000~0.001モル%、R16SiO3/2で表されるシロキサン単位(T単位)を0.000~0.500モル%含有し(但し、R11、R12、R13、R14、R15、R16はそれぞれ非置換又は置換の1価炭化水素基を示す。)、かつ重量平均分子量が200,000~1,000,000で、更には分子量740以下の低分子量成分が0.5質量%以下である非反応性オルガノポリシロキサン層であることを特徴とする請求項12に記載のウエハ加工用仮接着材。
- 前記熱硬化性シロキサン変性重合体層(B)が、下記一般式(1)で示される繰り返し単位を有する重量平均分子量が3,000~500,000のシロキサン結合含有重合体100質量部に対して、架橋剤としてホルマリン又はホルマリン-アルコールにより変性されたアミノ縮合物、メラミン樹脂、尿素樹脂、1分子中に平均して2個以上のメチロール基又はアルコキシメチロール基を有するフェノール化合物、及び1分子中に平均して2個以上のエポキシ基を有するエポキシ化合物から選ばれるいずれか1種以上を0.1~50質量部含有する組成物の硬化物層であることを特徴とする請求項12又は請求項13に記載のウエハ加工用仮接着材。
- 前記熱硬化性シロキサン変性重合体層(B)が、下記一般式(3)で示される繰り返し単位を有する重量平均分子量が3,000~500,000のシロキサン結合含有重合体100質量部に対して、架橋剤として1分子中に平均して2個以上のフェノール基を有するフェノール化合物、及び1分子中に平均して2個以上のエポキシ基を有するエポキシ化合物から選ばれるいずれか1種以上を0.1~50質量部含有する組成物の硬化物層であることを特徴とする請求項12又は請求項13に記載のウエハ加工用仮接着材。
- 前記熱硬化性シロキサン重合体層(C)が、
(C-1)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン、
(C-2)1分子中に2個以上のケイ素原子に結合した水素原子(Si-H基)を含有するオルガノハイドロジェンポリシロキサン:前記(C-1)成分中のアルケニル基に対する(C-2)成分中のSi-H基のモル比が0.3から10となる量、
(C-3)白金系触媒、
を含有する組成物の硬化物層であることを特徴とする請求項12から請求項15のいずれか1項に記載のウエハ加工用仮接着材。 - 前記熱硬化性シロキサン重合体層(C)が、更に、(C-4)成分として反応制御剤:前記(C-1)および前記(C-2)成分の合計100質量部に対して0.1から10質量部、
を含有するものであることを特徴とする請求項16に記載のウエハ加工用仮接着材。 - 前記熱硬化性シロキサン重合体層(C)に積層された前記熱硬化性シロキサン変性重合体層(B)の前記重合体層(C)から界面剥離する際の熱硬化後におけるピール剥離力が、25mm幅の試験片の180°ピール剥離力で2gf以上50gf以下であることを特徴とする請求項12から請求項17のいずれか1項に記載のウエハ加工用仮接着材。
- 前記熱可塑性オルガノポリシロキサン重合体層(A)は、周辺部が一部除去されているものであることを特徴とする請求項12から請求項18のいずれか1項に記載のウエハ加工用仮接着材。
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WO2020235606A1 (ja) | 2019-05-22 | 2020-11-26 | 信越化学工業株式会社 | 基板用仮接着剤の洗浄液、基板の洗浄方法および支持体または基板の洗浄方法 |
WO2020235605A1 (ja) | 2019-05-22 | 2020-11-26 | 信越化学工業株式会社 | 洗浄剤組成物、基板の洗浄方法及び支持体又は基板の洗浄方法 |
JP2021014507A (ja) * | 2019-07-11 | 2021-02-12 | 信越化学工業株式会社 | 基板加工用仮接着材料及び積層体の製造方法 |
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JP7542089B2 (ja) | 2019-07-11 | 2024-08-29 | 信越化学工業株式会社 | 基板加工用仮接着材料及び積層体の製造方法 |
Also Published As
Publication number | Publication date |
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TWI640436B (zh) | 2018-11-11 |
US20160326414A1 (en) | 2016-11-10 |
KR102268248B1 (ko) | 2021-06-24 |
CN105960697A (zh) | 2016-09-21 |
JPWO2015115060A1 (ja) | 2017-03-23 |
CN105960697B (zh) | 2019-06-11 |
JP6130522B2 (ja) | 2017-05-17 |
KR20160114078A (ko) | 2016-10-04 |
EP3101681B1 (en) | 2020-03-25 |
EP3101681A1 (en) | 2016-12-07 |
US10106713B2 (en) | 2018-10-23 |
EP3101681A4 (en) | 2017-09-27 |
TW201542387A (zh) | 2015-11-16 |
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