WO2016035686A1 - フィルム状接着剤、フィルム状接着剤を用いた半導体パッケージ及びその製造方法 - Google Patents
フィルム状接着剤、フィルム状接着剤を用いた半導体パッケージ及びその製造方法 Download PDFInfo
- Publication number
- WO2016035686A1 WO2016035686A1 PCT/JP2015/074337 JP2015074337W WO2016035686A1 WO 2016035686 A1 WO2016035686 A1 WO 2016035686A1 JP 2015074337 W JP2015074337 W JP 2015074337W WO 2016035686 A1 WO2016035686 A1 WO 2016035686A1
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- WIPO (PCT)
- Prior art keywords
- film
- epoxy resin
- adhesive
- film adhesive
- adhesive layer
- Prior art date
Links
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 105
- 239000000853 adhesive Substances 0.000 title claims abstract description 104
- 239000004065 semiconductor Substances 0.000 title claims abstract description 79
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 111
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- 238000001879 gelation Methods 0.000 claims abstract description 16
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- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32135—Disposition the layer connector connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/32145—Disposition the layer connector connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being stacked
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention relates to a film adhesive, a semiconductor package using the film adhesive, and a manufacturing method thereof.
- Paste or film adhesive (die attach film) is used for bonding between the wiring board and the semiconductor chip and between the semiconductor chips in the manufacturing process of such a memory package.
- a die attach film that hardly causes contamination to other members such as a semiconductor chip and a wire pad due to the above is usually used.
- the wiring substrate and the surface of the semiconductor chip are not necessarily in a smooth state, so air may be caught at the interface with the adherend in the die attach process.
- the entrained air not only lowers the adhesive strength after heat curing, but also causes package cracks.
- thermosetting die attach film that lowers the viscosity of the die attach film at the time of mounting, causes it to follow the surface irregularities well, and then cures and uses it.
- thermosetting die attach film In multi-layer stacking of semiconductor chips in a package using a thermosetting die attach film, it is necessary to shorten the curing time in order to shorten the manufacturing process.
- the curing speed of the thermosetting resin contained in the thermosetting die attach film can be increased, and the curing time can be shortened. It becomes easy to generate the void which becomes the cause.
- the void which becomes the problem there is no practical problem if the die attach film is cured in the same size as the minute void (see FIG. 8A) having a maximum width of less than about 300 ⁇ m which is entered at the time of die attachment.
- thermosetting die attach film As a conventional thermosetting die attach film, an adhesive film having a minimum melt viscosity of 2000 Pa ⁇ s or less and a minimum melt viscosity within a temperature range of 50 to 170 ° C. is disclosed (see Patent Document 1). . Since this adhesive film has the above-mentioned viscosity characteristics, it is possible to increase the adhesiveness at low temperature and the followability of the adhesive film to fine irregularities on the surface of the substrate etc. There has been a problem that voids that cause package cracks and the like are likely to occur during curing because they have not been noticed and the slow-curing property has not been improved.
- an adhesive film containing an epoxy resin, a curing agent, and fumed silica particles, and having a minimum melt viscosity within a temperature range of 70 to 120 ° C. within a range of 2500 to 10000 Pa ⁇ s Patent Document. 2
- the melt viscosity in the temperature range exceeding 120 ° C. necessary for curing the die attach film, and since the fumed silica content is small, the melt viscosity in the temperature region exceeding 120 ° C.
- voids that cause package cracks and the like are easily generated during curing.
- the present invention provides a film adhesive that can reduce the generation of voids even when curing is performed in a high temperature and short time in multi-layered semiconductor chips, a semiconductor package using the film adhesive, and its manufacture It aims to provide a method.
- a film adhesive according to the present invention contains an epoxy resin (A), an epoxy resin curing agent (B), a phenoxy resin (C), and a silica filler (D),
- the content of the silica filler (D) is 30 to about the total amount of the epoxy resin (A), the epoxy resin curing agent (B), the phenoxy resin (C), and the silica filler (D).
- the temperature is 70% by mass and the temperature is increased from room temperature at a rate of 5 ° C./min, a minimum melt viscosity in the range of 200 to 10000 Pa ⁇ s is exhibited in the range of more than 120 ° C. and less than 180 ° C.
- the gelation time at 180 ° C. according to the prescribed hot plate method is 1 to 200 seconds.
- hydrophobic fumed silica having a specific surface area of 10 to 300 m 2 / g according to the BET method defined in JIS Z8830 is preferably added as at least one silica filler (D).
- a method of manufacturing a semiconductor package according to the present invention comprises thermocompression bonding the film adhesive and the dicing tape to the back surface of a wafer having at least one semiconductor circuit formed on the front surface.
- a first step of providing an adhesive layer and a dicing tape on the back surface of the wafer, and dicing the wafer and the adhesive layer simultaneously to obtain a semiconductor chip with an adhesive layer comprising the wafer and the adhesive layer A second step, a third step of detaching the dicing tape from the adhesive layer, and thermocompression bonding the semiconductor chip with the adhesive layer and the wiring substrate through the adhesive layer; and the adhesive layer.
- a fourth step of thermosetting is
- a semiconductor package according to the present invention is obtained by the above-described method for manufacturing a semiconductor package.
- the film-like adhesive according to the present invention, the semiconductor package using the film-like adhesive, and the manufacturing method thereof can reduce the generation of voids even when the semiconductor chip is cured at a high temperature and in a short time in multi-layer stacking. .
- the semiconductor package using the film adhesive according to the present invention does not reduce the adhesive force of the semiconductor chip to the substrate and other semiconductor chips, and can reduce the occurrence of package cracks.
- the manufacturing method of the semiconductor package using the film adhesive by this invention can manufacture a semiconductor package in a short time.
- (A) is a top view which shows typically a mode after thermocompression-bonding the conventional glass chip with a die attach film to a wiring board
- (B) is a conventional glass chip with a die attach film on a wiring board. It is a top view which shows typically the mode after carrying out thermosetting of the die attach film after thermocompression bonding.
- the film adhesive according to the embodiment of the present invention contains an epoxy resin (A), an epoxy resin curing agent (B), a phenoxy resin (C), and a silica filler (D), and the silica filler (
- the content of D) is 30 to 70% by mass with respect to the total amount of the epoxy resin (A), the epoxy resin curing agent (B), the phenoxy resin (C) and the silica filler (D).
- Yes when heated from room temperature at a heating rate of 5 ° C./min, it exhibits a minimum melt viscosity in the range of 200 to 10000 Pa ⁇ s in the range of over 120 ° C. and below 180 ° C., and is specified in JIS K6911
- the gelation time at 180 ° C. according to the method is 1 to 200 seconds.
- the film adhesive according to the embodiment of the present invention has a minimum melt viscosity of 200 to 10,000 Pa ⁇ s in the range of more than 120 ° C. and 180 ° C. or less when the temperature is raised from room temperature at a rate of 5 ° C./min. Is in. Further, the minimum melt viscosity is preferably in the range of 200 to 3000 Pa ⁇ s, particularly preferably in the range of 200 to 2000 Pa ⁇ s. When the minimum melt viscosity is greater than 10,000 Pa ⁇ s, voids are likely to remain between the wiring substrate irregularities when the semiconductor chip provided with the film adhesive is thermocompression bonded onto the wiring substrate. On the other hand, if it is less than 200 Pa ⁇ s, voids are likely to occur when the semiconductor chip provided with the film adhesive is mounted on a wiring board and then thermally cured.
- the melt viscosity is measured using a rheometer, the change in viscosity resistance is measured at a temperature range of 30 to 200 ° C., and the heating rate is 5 ° C./min. Viscosity resistance when the temperature is higher than 120 ° C and lower than 180 ° C. Also, in the melt viscosity obtained under these conditions, the temperature when the minimum melt viscosity is reached (minimum melt viscosity reach temperature) correlates with the curing speed of the film adhesive, and the curing speed is faster at lower temperatures. Indicates.
- the film adhesive according to the embodiment of the present invention has a gelation time at 180 ° C. by a hot plate method specified in JIS K6911 in the range of 50 to 200 seconds. Furthermore, the 180 ° gelation time is preferably in the range of 100 to 200 seconds, and more preferably in the range of 150 to 200 seconds. When the 180 ° gelation time is longer than 200 seconds, the curing time becomes long, and voids are likely to be generated during thermosetting. If it is less than 50 seconds, the film-like adhesive is likely to proceed with thermosetting at a lower temperature, and the thermosetting may proceed during the solvent drying heat treatment during film production.
- the gelation time is measured at a stage temperature of 180 ° C. according to JIS 6911 using a gelation tester.
- Epoxy resin (A) The epoxy resin (A) contained in the adhesive film according to the present invention is not particularly limited as long as it has an epoxy group.
- the skeleton of the epoxy resin (A) is phenol novolak type, orthocresol novolak type, dicyclopentadiene type, biphenyl type, fluorene bisphenol A type, triazine type, naphthol type, naphthalenediol type, triphenylmethane type, tetraphenyl type, Bisphenol a type, bisphenol F type, bisphenol AD type, bisphenol S type, trimethylolmethane type and the like can be used.
- the epoxy resin (A) preferably has an epoxy equivalent of 500 g / eq or less, and 150 to 450 g / eq in order to increase the crosslink density of the cured product and consequently improve the mechanical strength and heat resistance. It is more preferable.
- an epoxy equivalent means the gram number (g / eq) of resin containing an epoxy group of 1 gram equivalent.
- the epoxy resin (A) one kind may be used alone, or two or more kinds may be used in combination. When two or more kinds are used in combination, for example, the viscosity of the composition is easily adjusted. Adhesion between the wafer and the film adhesive can be sufficiently exerted even when the process of thermally pressing the film adhesive and the wafer (wafer laminating process) is performed at a low temperature (preferably 40 to 80 ° C.). In view of the tendency, it is preferable to use a combination of an epoxy resin (a1) having a softening point of 50 to 100 ° C. and an epoxy resin (a2) having a softening point of less than 50 ° C.
- the epoxy resin (a1) is solid or semi-solid at room temperature, and preferably has a softening point of 50 to 100 ° C., more preferably 50 to 80 ° C.
- the softening point is less than 50 ° C.
- the viscosity of the resulting adhesive decreases, and thus it tends to be difficult to maintain the film shape at room temperature.
- it exceeds 100 ° C. the obtained film-like adhesion In the agent, it tends to be difficult to reach the minimum melt viscosity in the range of 200 to 10,000 Pa ⁇ s in the range of more than 120 ° C. and 180 ° C. or less.
- the weight average molecular weight is preferably more than 500 and not more than 2000, and more preferably 600 to 1200.
- the weight average molecular weight is 500 or less, the monomer and dimer increase and the crystallinity increases, so the film adhesive tends to be brittle.
- the weight average molecular weight exceeds 2000, the film adhesive melts. Since the viscosity becomes high, the unevenness on the substrate cannot be embedded sufficiently when pressure-bonded to the wiring substrate, and the adhesion to the wiring substrate tends to decrease.
- skeleton of such an epoxy resin (a1) triphenylmethane type, bisphenol A type, cresol novolak type, ortho type are used from the viewpoint of obtaining a film-like adhesive having low resin crystallinity and good appearance.
- a cresol novolac type and a dicyclopentadiene type are preferable, and a triphenylmethane type epoxy resin, a bisphenol A type epoxy resin, and a cresol novolak type epoxy resin are more preferable.
- the adhesion between the wafer and the film adhesive is achieved.
- the softening point is preferably less than 50 ° C., and the softening point is more preferably 40 ° C. or less so that the properties are sufficiently exhibited.
- Such an epoxy resin (a2) preferably has a weight average molecular weight of 300 to 500, more preferably 350 to 450. If the weight average molecular weight is less than 300, the amount of monomers increases and the crystallinity becomes strong, so that the film adhesive tends to be brittle. On the other hand, if it exceeds 500, the melt viscosity becomes high. In this case, the adhesion between the wafer and the film adhesive tends to be lowered.
- bisphenol A type and bisphenol A which are oligomer type liquid epoxy resins, are used.
- / F mixed type, bisphenol F type, and propylene oxide modified bisphenol A type are more preferred. preferable.
- the mass ratio (a1: a2) is preferably 95: 5 to 30:70, and preferably 70:30 to 40:60. More preferred. If the content of the epoxy resin (a1) is less than the above lower limit, the film adhesive property of the film-like adhesive tends to be strong and difficult to peel off from the cover film or the dicing tape. The viscosity of the film tends to be high, and the properties of the obtained film adhesive tend to be brittle.
- epoxy resin curing agent (B) As the epoxy resin curing agent (B) used in the present invention, known curing agents such as amines, acid anhydrides, polyhydric phenols and the like can be used.
- the epoxy resin (A) is a latent curing agent that exhibits curability at a temperature equal to or higher than the temperature at which necessary tackiness is exhibited, and also exhibits rapid curability.
- latent curing agent dicyandiamide, imidazoles, hydrazides, boron trifluoride-amine complexes, amine imides, polyamine salts and modified products thereof, and microcapsules can also be used. These can be used alone or in admixture of two or more.
- the amount of the epoxy resin curing agent (B) used is usually in the range of 0.5 to 50% by mass relative to the epoxy resin (A).
- a certain amount of a curing agent having a high curing rate such as imidazoles.
- imidazole it is preferable to use imidazole as the catalyst.
- Phenoxy resin (C) As a phenoxy resin (C) used for this invention, it uses in order to provide sufficient adhesiveness and film forming property (film-forming property) to a film adhesive.
- Phenoxy resin has good compatibility with epoxy resin because of its similar structure, low resin melt viscosity, and good adhesion.
- the phenoxy resin is usually a thermoplastic resin having a molecular weight of 10,000 or more obtained from bisphenol such as bisphenol A and epichlorohydrin. Mixing the phenoxy resin is effective in eliminating tackiness and brittleness at room temperature.
- Preferred phenoxy resins are 1256 (bisphenol A type phenoxy resin, manufactured by Mitsubishi Chemical Corporation), YP-70 (bisphenol A / F type phenoxy resin, manufactured by Nisshinka Epoxy Manufacturing Co., Ltd.), FX-316 (bisphenol F type phenoxy).
- Commercially available phenoxy resins such as resin, manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.), and FX-280S (cardo skeleton type phenoxy resin, manufactured by Nippon Chemical Epoxy Manufacturing Co., Ltd.) may be used as the phenoxy resin (C). .
- silica filler (D) As a silica filler (D) used for this invention, it contributes to the low water absorption of a film adhesive, and the reduction of a linear expansion coefficient. If the value of the linear expansion coefficient is high, the difference between the linear expansion coefficient and the adherend such as the wiring board becomes large, which leads to stress on the interface with the adherend and the generation of package cracks. Absent.
- the content of the silica filler (D) is 30 to 70% by mass with respect to the total amount of the epoxy resin (A), the epoxy resin curing agent (B), the phenoxy resin (C) and the silica filler (D). More preferably, it is 40 to 60% by mass. This is because the minimum melt viscosity value is controlled by the amount of silica filler. When the blending amount is more than 70% by mass, the minimum melt viscosity value becomes large, and when the semiconductor chip provided with the film adhesive is thermocompression-bonded on the wiring board, voids easily remain between the wiring board irregularities, Film vulnerability becomes stronger. If the blending amount is less than 30% by mass, the minimum melt viscosity value becomes small, and voids are likely to occur during curing.
- the silica filler (D) is preferably spherical from the viewpoints of high filling and fluidity.
- the average particle size is preferably 0.01 to 5 ⁇ m. If the particle size is smaller than 0.01 ⁇ m, the filler tends to aggregate, causing unevenness during film production, and the resulting film thickness of the adhesive film may be poor. When the particle size is larger than 5 ⁇ m, when a thin film is produced with a coating machine such as a roll knife coater, the filler becomes a trigger, and streaks are likely to occur on the film surface.
- the average particle diameter means a particle diameter when 50% is accumulated when the total particle volume is 100% in the particle size distribution, and is measured by a laser diffraction / scattering method (measuring condition: dispersion medium- (Sodium hexametaphosphate, laser wavelength: 780 nm, measuring device: Microtrac MT3300EX), and can be determined from the cumulative curve of the volume fraction of the particle size distribution.
- the term “spherical” refers to a true sphere or a substantially true sphere that is substantially round and has no corners.
- a method of blending the silica filler (D) into the resin binder a method of directly blending the powdered spherical silica filler and a silane coupling agent as necessary (integrant method), or a silane coupling agent
- a method of blending a slurry-like silica filler in which a surface-treated spherical silica filler is dispersed in an organic solvent can be used.
- a slurry-like silica filler when a thin film is produced, it is more preferable to use a slurry-like silica filler.
- the silane coupling agent to be used those containing an amino group or an epoxy group are preferable.
- the silica filler (D) one kind may be used alone, or two or more kinds may be used in combination. When two or more types are used in combination, it is preferable to use at least one hydrophobic fumed silica having a specific surface area of 10 to 300 m 2 / g according to the BET method defined in JIS Z8830.
- the minimum melt viscosity can be easily adjusted to be high.
- the specific surface area is less than 10 m 2 / g, the hydrophobic fumed silica tends to aggregate, resulting in unevenness during film production, and the film thickness uniformity of the obtained adhesive film may deteriorate.
- the specific surface area is larger than 300 m 2 / g, the effect of increasing the melt viscosity is hardly exhibited.
- the filling amount in the case where hydrophobic fumed silica is used in combination is not particularly limited, but preferably 0.1 to 10% by mass, more preferably based on the total amount of (A) epoxy resin and (C) phenoxy resin. It is preferable to blend 1 to 5% by mass with respect to the total amount of (A) epoxy resin and (C) phenoxy resin. If the blending amount is more than 10% by mass, the hydrophobic fumed silica tends to aggregate, causing unevenness during film production, and the film thickness uniformity of the obtained adhesive film may be deteriorated. When the blending amount is less than 0.1% by mass, the effect of increasing the melt viscosity is hardly exhibited, and voids are easily generated during curing.
- hydrophobic fumed silica examples include AEROSIL RY200 (specific surface area 100 m 2 / g, manufactured by Nippon Aerosil), AEROSIL RY200S (specific surface area 80 m 2 / g, manufactured by Nippon Aerosil), AEROSIL RY50 (specific surface area 30 m 2 / g, Nippon Aerosil), AEROSIL NY50 (specific surface area 30 m 2 / g, made by Nippon Aerosil), AEROSIL RY300 (specific surface area 125 m 2 / g, made by Nippon Aerosil), AEROSIL R202 (specific surface area 100 m 2 / g, made by Nippon Aerosil), etc. Is mentioned.
- composition for film adhesive of the present invention in addition to the epoxy resin (A), the epoxy resin curing agent (B), the polymer component (C), and the silica filler (D), as long as the effect is not impaired, an additive such as a viscosity modifier, an antioxidant, a flame retardant, a colorant, a stress relaxation agent such as butadiene rubber or silicone rubber may be further contained.
- an additive such as a viscosity modifier, an antioxidant, a flame retardant, a colorant, a stress relaxation agent such as butadiene rubber or silicone rubber may be further contained.
- a method for coating a film-like adhesive composition on one surface of a release-treated base film and subjecting it to heat drying is not particularly limited.
- any film may be used as long as it functions as a cover film for the obtained film-like adhesive, and a known film can be appropriately employed.
- a known film can be appropriately employed.
- PET Release-treated polyethylene
- PET release-treated polyethylene terephthalate
- the coating method a known method can be appropriately employed, and examples thereof include a method using a roll knife coater, a gravure coater, a die coater, a reverse coater and the like.
- the film-like adhesive of the present invention preferably has a thickness of 5 to 200 ⁇ m, and from the viewpoint that the unevenness on the surface of the wiring board and semiconductor chip can be more fully embedded. More preferably, it is 40 ⁇ m. If the thickness is less than 5 ⁇ m, the unevenness on the surface of the wiring board and the semiconductor chip cannot be sufficiently embedded, and there is a tendency that sufficient adhesion cannot be ensured. On the other hand, if the thickness exceeds 200 ⁇ m, the organic solvent may be removed during production. Since it becomes difficult, the amount of residual solvent increases, and the film tackiness tends to increase.
- the minimum melt viscosity of the present invention can be achieved by a combination of the composition and blending ratio as described above, and a part of the epoxy resin curing reaction is performed by intentionally pre-heat treatment after film production, This can be achieved by increasing the melt viscosity, and the generation of voids during high-temperature thermosetting in the semiconductor assembly process can be suppressed.
- the pre-heat treatment temperature at this time is preferably 80 to 150 ° C., more preferably 100 to 130 ° C., and the pre-heat treatment time is preferably 5 to 300 minutes, more preferably 30 to 200 minutes. .
- FIG. 1 to FIG. 7 are schematic longitudinal sectional views showing a preferred embodiment of each step of the manufacturing method of the semiconductor package of the present invention.
- the film adhesive of the present invention is formed on the back surface of a wafer 1 on which at least one semiconductor circuit is formed.
- the adhesive layer 2 is provided by thermocompression bonding, and then the wafer 1 and the dicing tape 3 are bonded via the adhesive layer 2.
- a product obtained by previously integrating the adhesive layer 2 and the dicing tape 3 may be thermocompression bonded at a time. It does not restrict
- a wafer having at least one semiconductor circuit formed on the surface can be used as appropriate, and examples thereof include a silicon wafer, a SiC wafer, and a GaS wafer.
- the adhesive layer 2 the film adhesive of the present invention may be used alone as one layer, or two or more layers may be laminated and used.
- a method of providing such an adhesive layer 2 on the back surface of the wafer 1 a method capable of laminating a film-like adhesive on the back surface of the wafer 1 can be appropriately employed.
- the wafer 1 and the adhesive layer 2 are diced simultaneously to form the semiconductor chip 4 and the adhesive layer 2.
- the semiconductor chip 5 with an adhesive layer provided is obtained.
- the apparatus used for dicing is not particularly limited, and a known dicing apparatus can be used as appropriate.
- the dicing tape 3 is detached from the adhesive layer 2, and the semiconductor chip 5 with the adhesive layer and the wiring substrate 6 are removed.
- the semiconductor chip 4 is mounted on the wiring board 6 by thermocompression bonding through the adhesive layer 2.
- a board having a semiconductor circuit formed on the surface can be used as appropriate.
- a printed circuit board (PCB) various lead frames, and electronic components such as a resistance element and a capacitor are mounted on the board surface.
- the substrate which was made is mentioned.
- the method for mounting the semiconductor chip 4 is not particularly limited, and the electronic component in which the semiconductor chip 5 with the adhesive layer is mounted on the wiring substrate 6 or the surface of the wiring substrate 6 by using the adhesive layer 2.
- a conventional method that can be adhered to the substrate can be appropriately employed.
- a conventionally known heating method such as a method using a mounting technique using a flip chip bonder having a heating function from the upper part, a method using a die bonder having a heating function only from the lower part, a method using a laminator, etc. And a pressurizing method.
- the adhesive layer 2 is thermally cured.
- the thermosetting temperature is not particularly limited as long as it is equal to or higher than the thermosetting start temperature of the film-like adhesive (adhesive layer 2), and is different depending on the type of resin to be used. For example, it is preferably more than 120 ° C. and 180 ° C. or less, and more preferably 140 to 180 ° C. from the viewpoint that curing at a higher temperature can be cured in a short time. If the temperature is lower than the thermosetting start temperature, the thermosetting does not proceed sufficiently, and the strength of the adhesive layer 2 tends to decrease.
- the film adhesive can be cured in a short time by thermosetting the film adhesive at a high temperature, and the wiring substrate 6 and the wafer 1 are firmly bonded without generating voids even when cured at a high temperature. A semiconductor package adhered to the substrate can be obtained.
- a connection method is not particularly limited, and a conventionally known method such as a wire bonding method, a TAB (Tape Automated Bonding) method, or the like can be appropriately employed.
- a plurality of semiconductor chips 5 with an adhesive layer may be thermocompression-bonded and thermoset on the surface of the mounted semiconductor chip 4 and then connected to the wiring substrate 7 again by a wire bonding method to be stacked.
- a method of laminating the semiconductor chips 4 as shown in FIG. 5 or a method of laminating the bonding wires 7 while embedding the bonding wires 7 by increasing the thickness of the second and subsequent adhesive layers 2 as shown in FIG. is there.
- the sealing resin 8 is not particularly limited, and a known sealing resin that can be used for manufacturing a semiconductor package can be used as appropriate. Moreover, it does not restrict
- the wafer 1 is fixed to the wiring substrate 6 without generating voids in the adhesive layer 2 made of a film adhesive even when high temperature curing is performed. be able to.
- the package assembly time can be shortened because the semiconductor chip 4 can be cured in a short time by high temperature curing.
- Example 1 First, slurry-like surface-treated spherical silica filler (trade name: SC2050-KNP, silica average particle size 0.5 ⁇ m, surface-treating agent: 3-glycidoxypropyltrimethoxysilane, solvent: MIBK, solid content concentration: 70 wt% , Manufactured by Admatechs Co., Ltd.) 310 parts by mass, solid cresol novolac type epoxy resin (trade name: EOCN-1020-70, softening point: 70 ° C., solid, epoxy equivalent: 200, manufactured by Nippon Kayaku Co., Ltd.) , Liquid bisphenol A type epoxy resin (trade name: YD-128, softening point: 25 ° C.
- liquid, epoxy equivalent 190, manufactured by Nippon Kayaku Epoxy Co., Ltd.
- 49 parts by mass bisphenol A type phenoxy resin (trade name) : YP-50S, Tg: 84 ° C., manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.)
- YP-50S bisphenol A type phenoxy resin
- Tg 84 ° C., manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.
- Example 2 (Example 2) Implemented except using dicyclopentadiene type epoxy resin (trade name: XD-1000, softening point: 70 ° C., solid, epoxy equivalent: 250, manufactured by Nippon Kayaku Co., Ltd.) instead of cresol novolac type epoxy resin
- dicyclopentadiene type epoxy resin trade name: XD-1000, softening point: 70 ° C., solid, epoxy equivalent: 250, manufactured by Nippon Kayaku Co., Ltd.
- Example 3 First, slurry-like surface-treated spherical silica filler (trade name: SC2050-KNP, silica average particle size 0.5 ⁇ m, surface-treating agent: 3-glycidoxypropyltrimethoxysilane, solvent: MIBK, solid content concentration: 70 wt% 286 parts by mass, manufactured by Admatechs Corporation, solid bisphenol A type epoxy resin (trade name: JER1002, softening point: 78 ° C., solid, epoxy equivalent: 200, manufactured by Mitsubishi Chemical Corporation), 40 parts by mass, liquid bisphenol A type Epoxy resin (trade name: YD-128, softening point: 25 ° C.
- SC2050-KNP silica average particle size 0.5 ⁇ m
- surface-treating agent 3-glycidoxypropyltrimethoxysilane
- solvent MIBK
- solid content concentration 70 wt% 286 parts by mass
- solid bisphenol A type epoxy resin trade name: JER1002, softening point: 78 ° C
- liquid, epoxy equivalent 190, manufactured by Nippon Kayaku Epoxy Co., Ltd.
- 100 parts by mass bisphenol A type phenoxy resin (trade name: YP-50S, Tg: 84 ° C, manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.)
- bisphenol A type phenoxy resin trade name: YP-50S, Tg: 84 ° C, manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.
- the obtained film adhesive composition was applied onto a 38 ⁇ m thick release-treated PET film and dried by heating at a temperature of 100 ° C. for 10 minutes, with a thickness of 200 mm ⁇ 300 mm and a thickness of 20 ⁇ m.
- a film adhesive was obtained.
- Example 4 A film adhesive composition in the same manner as in Example 3 except that 7 parts by mass (trade name: RY-200S, specific surface area 80 m 2 / g, manufactured by Nippon Aerosil Co., Ltd.) was used as the hydrophobic fumed silica. And the film adhesive was obtained.
- Example 5 A film adhesive composition in the same manner as in Example 4 except that 2 parts by mass (trade name: RY-200S, specific surface area 80 m 2 / g, manufactured by Nippon Aerosil Co., Ltd.) was used as the hydrophobic fumed silica. And the film adhesive was obtained.
- Example 6 First, slurry-like surface-treated spherical silica filler (trade name: SC2050-KNP, silica average particle size 0.5 ⁇ m, surface-treating agent: 3-glycidoxypropyltrimethoxysilane, solvent: MIBK, solid content concentration: 70 wt% 286 parts by mass, manufactured by Admatechs Corporation, solid bisphenol A type epoxy resin (trade name: JER1002, softening point: 78 ° C., solid, epoxy equivalent: 200, manufactured by Mitsubishi Chemical Corporation), 40 parts by mass, liquid bisphenol A type Epoxy resin (trade name: YD-128, softening point: 25 ° C.
- SC2050-KNP silica average particle size 0.5 ⁇ m
- surface-treating agent 3-glycidoxypropyltrimethoxysilane
- solvent MIBK
- solid content concentration 70 wt% 286 parts by mass
- solid bisphenol A type epoxy resin trade name: JER1002, softening point: 78 ° C
- liquid, epoxy equivalent 190, manufactured by Nippon Kayaku Epoxy Co., Ltd.
- 100 parts by mass bisphenol A type phenoxy resin (trade name: YP-50S, Tg: 84 ° C, manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.)
- a resin mixture was transferred to an 800 ml planetary mixer, and 6 parts of a dicyandiamide type curing agent (trade name: DICY7, manufactured by Mitsubishi Chemical Corporation), an imidazole type curing catalyst (trade name: 2PHZ-PW, Shikoku Chemicals).
- the obtained film adhesive composition was applied onto a 38 ⁇ m thick release-treated PET film and dried by heating at a temperature of 100 ° C. for 10 minutes, with a thickness of 200 mm ⁇ 300 mm and a thickness of 20 ⁇ m. A film adhesive was obtained. This film was further heated at a temperature of 120 ° C. for 3 hours to produce a film which was intentionally partially heat-cured to increase the melt viscosity.
- slurry-like surface-treated spherical silica filler (trade name: SC2050-KNP, silica average particle size 0.5 ⁇ m, surface-treating agent: 3-glycidoxypropyltrimethoxysilane, solvent: MIBK, solid content concentration: 70 wt% 154 parts by mass, manufactured by Admatechs Co., Ltd., liquid bisphenol A type epoxy resin (trade name: YD-128, softening point: 25 ° C.
- liquid, epoxy equivalent 190, manufactured by Nippon Kasei Epoxy Manufacturing Co., Ltd.
- 49 mass 30 parts by weight of bisphenol A type phenoxy resin (trade name: YP-50S, Tg: 84 ° C., manufactured by Nippon Kayaku Epoxy Manufacturing Co., Ltd.) are weighed and blended in a 500 ml separable flask at a temperature of 110 ° C. The mixture was heated and stirred for 2 hours to obtain a resin mixture.
- Example 5 A film adhesive composition and a film adhesive were obtained in the same manner as in Example 1 except that 617 parts by mass of the slurry-like surface-treated spherical silica filler was used.
- a film-like adhesive according to each of the examples and comparative examples was prepared by using a manual laminator (trade name: FM-114, manufactured by Technovision) at a temperature of 70 ° C. and a pressure of 0.3 MPa. After adhering to one surface of wafer, 8 inch size, thickness 100 ⁇ m), dicing on the surface opposite to the dummy silicon wafer of film adhesive at room temperature and pressure 0.3MPa using the same manual laminator A tape (trade name: K-13, manufactured by Furukawa Electric Co., Ltd.) and a dicing frame (trade name: DTF2-8-1H001, manufactured by DISCO) were adhered.
- a manual laminator trade name: FM-114, manufactured by Technovision
- a dicing apparatus (trade name: DFD-6340) in which a biaxial dicing blade (Z1: NBC-ZH2050 (27HEDD), manufactured by DISCO / Z2: NBC-ZH127F-SE (BC), manufactured by DISCO)) was installed. Dicing was performed to obtain a size of 10 mm ⁇ 10 mm using a DISCO company, to obtain a semiconductor chip. Next, a semiconductor chip was placed on a glass substrate (10 cm ⁇ 10 cm) using a die bonder (trade name: DB-800, manufactured by Hitachi High-Technologies Corporation) at a temperature of 120 ° C., a pressure of 0.1 MPa (load: 1000 gf), and a time of 1.0 second.
- a die bonder (trade name: DB-800, manufactured by Hitachi High-Technologies Corporation) at a temperature of 120 ° C., a pressure of 0.1 MPa (load: 1000 gf), and a time of 1.0 second.
- Thermocompression bonding was performed on the size and thickness (700 ⁇ m).
- the initial state in the film adhesive after thermocompression bonding was observed from the back side of the glass substrate. Thereafter, this was placed in a dryer and heated at 180 ° C. for 10 minutes to thermally cure the film adhesive, and the state in the film adhesive after thermosetting was observed from the back side of the glass substrate.
- the void is not visually confirmed, or even if it is confirmed, the maximum width is less than 300 ⁇ m and the number is less than 10, and the void does not substantially expand, causing package cracks. Those that did not develop into voids were evaluated as “good” as “good”.
- the void is not visually confirmed, or even if it is confirmed, the maximum width is less than 300 ⁇ m and the number is less than 10.
- the void is enlarged and the maximum width is When the number is 500 ⁇ m or more and the number is 10 or more, those that have developed into voids causing package cracks were evaluated as “x” as defective products.
- the content of silica filler (D) is epoxy resin (A), epoxy resin curing agent (B), phenoxy resin (C), and silica filler (D )
- the temperature is increased from room temperature at a rate of 5 ° C./min.
- it shows a minimum melt viscosity of 230-2100 Pa ⁇ s in the range of more than 120 ° C. and 180 ° C. and 200 to 10000 Pa ⁇ s as defined in claim 1, and 180 ° C. by the hot plate method specified in JIS K6911.
- the gelation time in the range of 165 to 195 seconds which is in the range of 1 to 200 seconds as defined in claim 1, is excellent in film properties, and is a film-like adhesive in a short time at a high temperature of 10 minutes at 180 ° C. Also related to cured It not without voids enlarging could be satisfactorily cured.
- Comparative Example 1 the gelation time was longer than 265 seconds and 200 seconds, so the voids expanded.
- Comparative Example 2 since the minimum melt viscosity was lower than 107 Pa ⁇ s and 200 Pa ⁇ s, the voids were still enlarged.
- Comparative Example 3 the silica filler was not included, and the minimum melt viscosity was lower than 30 Pa ⁇ s and 200 Pa ⁇ s.
- the content of the silica filler was 75% by mass and higher than 70% by mass, and the minimum melt viscosity was higher than 10,000 Pa ⁇ s.
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Abstract
Description
本発明に係る接着フィルムに含まれているエポキシ樹脂(A)は、エポキシ基を有するものであれば特に限定されない。
本発明に使用するエポキシ樹脂硬化剤(B)としては、アミン類、酸無水物類、多価フェノール類等の公知の硬化剤を用いることができるが、好ましくは常温以上の所定の温度、例えばエポキシ樹脂(A)が必要な粘着性を示す温度以上で硬化性を発揮し、しかも速硬化性を発揮する潜在性硬化剤である。潜在性硬化剤には、ジシアンジアミド、イミダゾール類、ヒドラジド類、三弗化ホウ素-アミン錯体、アミンイミド、ポリアミン塩及びこれらの変性物、更にマイクロカプセル型のものも使用可能である。これらは、単独あるいは2種以上混ぜて使用できる。潜在性硬化剤を使用することで室温での長期保存も可能な保存安定性の高いフィルム状接着剤用組成物を提供できる。エポキシ樹脂硬化剤(B)の使用量は、通常、エポキシ樹脂(A)に対して0.5~50質量%の範囲である。JIS K6911に規定する熱板法による180℃におけるゲル化時間を1~200秒とするためには、イミダゾール類等の硬化速度の速い硬化剤を一定部数量用いることが好ましい。また、硬化剤としてジシアンジアミド等を用いる場合は触媒としてイミダゾールを用いることが好ましい。
本発明に使用するフェノキシ樹脂(C)としては、フィルム状接着剤に十分な接着性および造膜性(フィルム形成性)を付与するために用いる。フェノキシ樹脂は、エポキシ樹脂と構造が類似していることから相溶性がよく、樹脂溶融粘度も低く、接着性もよい。フェノキシ樹脂は、ビスフェノールAのようなビスフェノールとエピクロロヒドリンとから得られる通常、分子量が10000以上の熱可塑性樹脂である。フェノキシ樹脂を配合することにより、常温でのタック性、脆さなどを解消するのに効果がある。好ましいフェノキシ樹脂は、1256(ビスフェノールA型フェノキシ樹脂、三菱化学株式会社製)、YP-70(ビスフェノールA/F型フェノキシ樹脂、新日化エポキシ製造株式会社製)、FX-316(ビスフェノールF型フェノキシ樹脂、新日化エポキシ製造株式会社製)、及び、FX-280S(カルド骨格型フェノキシ樹脂、新日化エポキシ製造株式会社製)等の市販のフェノキシ樹脂をフェノキシ樹脂(C)として用いてもよい。
本発明に使用するシリカ充填剤(D)としては、フィルム状接着剤の低吸水化、線膨張係数の低減に貢献する。線膨張率の値が高いと、配線基板等の被接着物との線膨張率の差が大きくなるため、被接着物との界面に応力がかかって、パッケージクラックを発生させることにつながり、好ましくない。
先ず、スラリー状表面処理球状シリカ充填剤(商品名:SC2050-KNP、シリカ平均粒径0.5μm、表面処理剤:3-グリシドキシプロピルトリメトキシシラン、溶媒:MIBK、固形分濃度:70wt%、株式会社アドマテックス製)310質量部、固形クレゾールノボラック型エポキシ樹脂(商品名:EOCN-1020-70、軟化点:70℃、固体、エポキシ当量:200、日本化薬株式会社製)56質量部、液体ビスフェノールA型エポキシ樹脂(商品名:YD-128、軟化点:25℃以下、液体、エポキシ当量:190、新日化エポキシ製造株式会社製)49質量部、ビスフェノールA型フェノキシ樹脂(商品名:YP-50S、Tg:84℃、新日化エポキシ製造株式会社製)30質量部を秤量して配合し、500mlのセパラブルフラスコ中、温度110℃において2時間加熱攪拌して樹脂混合物を得た。次いで、この樹脂混合物445質量部を800mlのプラネタリーミキサーに移し、イミダゾール型硬化剤(商品名:2PHZ-PW、四国化成株式会社製)9質量部と疎水性ヒュームドシリカ(商品名:RY-200、比表面積100m2/g、日本アエロジル株式会社製)2質量部を加え、室温において1時間攪拌混合した後、真空脱泡してフィルム状接着剤用組成物を得た。次いで、得られたフィルム状接着剤用組成物を厚さ38μmの離型処理されたPETフィルム上に塗布して温度100℃において10分間加熱して乾燥させ、200mm×300mm、厚さが20μmであるフィルム状接着剤を得た。
クレゾールノボラック型エポキシ樹脂に代えて、ジシクロペンタジエン型エポキシ樹脂(商品名:XD-1000、軟化点:70℃、固体、エポキシ当量:250、日本化薬株式会社製)を用いたこと以外は実施例1と同様にして、フィルム状接着剤用組成物及びフィルム状接着剤を得た。
先ず、スラリー状表面処理球状シリカ充填剤(商品名:SC2050-KNP、シリカ平均粒径0.5μm、表面処理剤:3-グリシドキシプロピルトリメトキシシラン、溶媒:MIBK、固形分濃度:70wt%、株式会社アドマテックス製)286質量部、固形ビスフェノールA型エポキシ樹脂(商品名:JER1002、軟化点:78℃、固体、エポキシ当量:200、三菱化学株式会社製)40質量部、液体ビスフェノールA型エポキシ樹脂(商品名:YD-128、軟化点:25℃以下、液体、エポキシ当量:190、新日化エポキシ製造株式会社製)100質量部、ビスフェノールA型フェノキシ樹脂(商品名:YP-50S、Tg:84℃、新日化エポキシ製造株式会社製)100質量部を秤量して配合し、500mlのセパラブルフラスコ中、温度110℃において2時間加熱攪拌して樹脂混合物を得た。次いで、この樹脂混合物440質量部を800mlのプラネタリーミキサーに移し、ジシアンジアミド型硬化剤(商品名:DICY7、三菱化学株式会社製)6部、イミダゾール型硬化剤(商品名:2PHZ-PW、四国化成株式会社製)1質量部と疎水性ヒュームドシリカ(商品名:RY-200、比表面積100m2/g、日本アエロジル株式会社製)7質量部を加え、室温において1時間攪拌混合した後、真空脱泡してフィルム状接着剤用組成物を得た。次いで、得られたフィルム状接着剤用組成物を厚さ38μmの離型処理されたPETフィルム上に塗布して温度100℃において10分間加熱して乾燥させ、200mm×300mm、厚さが20μmであるフィルム状接着剤を得た。
疎水性ヒュームドシリカとして(商品名:RY-200S、比表面積80m2/g、日本アエロジル株式会社製)7質量部を用いたこと以外は実施例3と同様にしてフィルム状接着剤用組成物及びフィルム状接着剤を得た。
疎水性ヒュームドシリカとして(商品名:RY-200S、比表面積80m2/g、日本アエロジル株式会社製)2質量部を用いたこと以外は実施例4と同様にしてフィルム状接着剤用組成物及びフィルム状接着剤を得た。
先ず、スラリー状表面処理球状シリカ充填剤(商品名:SC2050-KNP、シリカ平均粒径0.5μm、表面処理剤:3-グリシドキシプロピルトリメトキシシラン、溶媒:MIBK、固形分濃度:70wt%、株式会社アドマテックス製)286質量部、固形ビスフェノールA型エポキシ樹脂(商品名:JER1002、軟化点:78℃、固体、エポキシ当量:200、三菱化学株式会社製)40質量部、液体ビスフェノールA型エポキシ樹脂(商品名:YD-128、軟化点:25℃以下、液体、エポキシ当量:190、新日化エポキシ製造株式会社製)100質量部、ビスフェノールA型フェノキシ樹脂(商品名:YP-50S、Tg:84℃、新日化エポキシ製造株式会社製)100質量部を秤量して配合し、500mlのセパラブルフラスコ中、温度110℃において2時間加熱攪拌して樹脂混合物を得た。次いで、この樹脂混合物440質量部を800mlのプラネタリーミキサーに移し、ジシアンジアミド型硬化剤(商品名:DICY7、三菱化学株式会社製)6部、イミダゾール型硬化触媒(商品名:2PHZ-PW、四国化成株式会社製)1質量部を加え、室温において1時間攪拌混合した後、真空脱泡してフィルム状接着剤用組成物を得た。次いで、得られたフィルム状接着剤用組成物を厚さ38μmの離型処理されたPETフィルム上に塗布して温度100℃において10分間加熱して乾燥させ、200mm×300mm、厚さが20μmであるフィルム状接着剤を得た。このフィルムをさらに温度120℃において3時間加熱することで、意図的に部分的に熱硬化させ溶融粘度を上昇させたフィルムを作製した。
先ず、スラリー状表面処理球状シリカ充填剤(商品名:SC2050-KNP、シリカ平均粒径0.5μm、表面処理剤:3-グリシドキシプロピルトリメトキシシラン、溶媒:MIBK、固形分濃度:70wt%、株式会社アドマテックス製)154質量部、液体ビスフェノールA型エポキシ樹脂(商品名:YD-128、軟化点:25℃以下、液体、エポキシ当量:190、新日化エポキシ製造株式会社製)49質量部、ビスフェノールA型フェノキシ樹脂(商品名:YP-50S、Tg:84℃、新日化エポキシ製造株式会社製)30質量部を秤量して配合し、500mlのセパラブルフラスコ中、温度110℃において2時間加熱攪拌して樹脂混合物を得た。次いで、この樹脂混合物233質量部を800mlのプラネタリーミキサーに移し、トリフェニルホスフィン型硬化触媒(商品名:TPP-K、北興化学株式会社製)0.8部質量部を加え、室温において1時間攪拌混合した後、真空脱泡してフィルム状接着剤用組成物を得た。次いで、得られたフィルム状接着剤用組成物を厚さ38μmの離型処理されたPETフィルム上に塗布して温度100℃において10分間加熱して乾燥させ、200mm×300mm、厚さが20μmであるフィルム状接着剤を得た。
120℃において3時間の意図的熱硬化を実施しなかった以外は実施例6と同様にしてフィルム状接着剤用組成物及びフィルム状接着剤を得た。
液体ビスフェノールA型エポキシ樹脂の代わりに鎖状・脂環式エポキシエポキシ樹脂(商品名:EP-4000L、軟化点:25℃以下、液体、エポキシ当量:255、株式会社ADEKA製)を用いたこと以外は比較例2と同様にしてフィルム状接着剤用組成物及びフィルム状接着剤を得た。
先ず、固形クレゾールノボラック型エポキシ樹脂(商品名:EOCN-1020-70、軟化点:70℃、固体、エポキシ当量:200、日本化薬株式会社製)56質量部、液体ビスフェノールA型エポキシ樹脂(商品名:YD-128、軟化点:25℃以下、液体、エポキシ当量:190、新日化エポキシ製造株式会社製)49質量部、ビスフェノールA型フェノキシ樹脂(商品名:YP-50S、Tg:84℃、新日化エポキシ製造株式会社製)30質量部、MIBK93質量部を秤量して配合し、500mlのセパラブルフラスコ中、温度110℃において2時間加熱攪拌して樹脂混合物を得た。次いで、この樹脂混合物445質量部を800mlのプラネタリーミキサーに移し、イミダゾール型硬化剤(商品名:2PHZ-PW、四国化成株式会社製)9質量部と疎水性ヒュームドシリカ(商品名:RY-200、比表面積100m2/g、日本アエロジル株式会社製)2質量部を加え、室温において1時間攪拌混合した後、真空脱泡してフィルム状接着剤用組成物を得た。次いで、得られたフィルム状接着剤用組成物を厚さ38μmの離型処理されたPETフィルム上に塗布して温度100℃において10分間加熱して乾燥させ、200mm×300mm、厚さが20μmであるフィルム状接着剤を得た。
スラリー状表面処理球状シリカ充填剤617質量部用いた以外は、実施例1と同様にしてフィルム状接着剤用組成物及びフィルム状接着剤を得た。
各実施例及び比較例に係るフィルム状接着剤を5.0cm×5.0cmのサイズに切り取って積層し、ステージ70℃の熱板上で、ハンドローラーにて貼り合わせて、厚さが約1.0mmである試験片を得た。この試験片について、レオメーター(RS6000、Haake社製)を用い、温度範囲20~250℃、昇温速度5℃/minでの粘性抵抗の変化を測定し、得られた温度-粘性抵抗曲線から最低溶融粘度(Pa・s)、並びに最低溶融粘度到達温度(℃)を算出した。
各実施例及び比較例に係るフィルム状接着剤を約2gのサイズを量り取り、ゲル化試験機(商品名:A0E1、株式会社井元製作所製)を用い、JIS K6911に準拠してステージ温度180℃でゲル化時間を測定した。
各実施例及び比較例に係るフィルム状接着剤を、先ず、マニュアルラミネーター(商品名:FM-114、テクノビジョン社製)を用いて温度70℃、圧力0.3MPaにおいてダミーシリコンウェハ(アルミ蒸着シリコンウェハ、8inchサイズ、厚さ100μm)の一方の面に接着させた後、同マニュアルラミネーターを用いて室温、圧力0.3MPaにおいてフィルム状接着剤の前記ダミーシリコンウェハとは反対側の面上にダイシングテープ(商品名:K-13、古河電気工業株式会社製)及びダイシングフレーム(商品名:DTF2-8-1H001、DISCO社製)を接着させた。次いで、2軸のダイシングブレード(Z1:NBC-ZH2050(27HEDD)、DISCO社製/Z2:NBC-ZH127F-SE(BC)、DISCO社製)が設置されたダイシング装置(商品名:DFD-6340、DISCO社製)を用いて10mm×10mmのサイズになるようにダイシングを実施して半導体チップを得た。
次いで、ダイボンダー(商品名:DB-800、株式会社日立ハイテクノロジーズ製)にて温度120℃、圧力0.1MPa(荷重1000gf)、時間1.0秒の条件において半導体チップをガラス基板(10cm×10cmサイズ、厚さ700μm)上に熱圧着した。熱圧着後のフィルム状接着剤中の初期状態をガラス基板裏面から観察した。その後、これを乾燥機中に配置して温度180℃で10分加熱することによりフィルム状接着剤を熱硬化させ、熱硬化後のフィルム状接着剤中の状態をガラス基板裏面から観察した。熱圧着後及び熱硬化後において、ボイドが目視では確認されないか、確認されたとしても最大幅が300μm未満で個数が10個未満と、実質的にボイドが拡大化せず、パッケージクラックの原因となるようなボイドに進展していないものを良品として「○」で評価した。一方、熱圧着後においては、ボイドが目視では確認されないか、確認されたとしても最大幅が300μm未満で個数が10個未満であるが、熱硬化後においては、ボイドが拡大化し、最大幅が500μm以上で個数が10個以上と、パッケージクラックの原因となるボイドに進展しているものを不良品として「×」で評価した。
2:接着剤層
3:ダイシングテープ
4:半導体チップ
5:接着剤層付き半導体チップ
6:配線基板
7:ボンディングワイヤー
8:封止樹脂
9:半導体パッケージ
Claims (4)
- エポキシ樹脂(A)、エポキシ樹脂硬化剤(B)、フェノキシ樹脂(C)、シリカ充填剤(D)を含有しており、
前記シリカ充填剤(D)の含有量が、前記エポキシ樹脂(A)、前記エポキシ樹脂硬化剤(B)、前記フェノキシ樹脂(C)及び前記シリカ充填剤(D)の合計量に対して、30~70質量%であり、
且つ、室温から5℃/分の昇温速度で昇温したとき、120℃超180℃以下の範囲において200~10000Pa・sの範囲の最低溶融粘度を示し、JIS K6911に規定する熱板法による180℃におけるゲル化時間が1~200秒であることを特徴とするフィルム状接着剤。 - シリカ充填剤(D)の少なくとも1つとして、JIS Z8830に規定するBET法による比表面積が10~300m2/gである疎水性ヒュームドシリカを添加することを特徴とする請求項1に記載のフィルム状接着剤。
- 表面に少なくとも1つの半導体回路が形成されたウェハの裏面に、請求項1又は請求項2に記載のフィルム状接着剤及びダイシングテープを熱圧着して、前記ウェハの裏面に接着剤層及びダイシングテープを設ける第1の工程と、
前記ウェハと前記接着剤層とを同時にダイシングすることにより前記ウェハ及び前記接着剤層を備える接着剤層付き半導体チップを得る第2の工程と、
前記接着剤層から前記ダイシングテープを脱離し、前記接着剤層付き半導体チップと配線基板とを前記接着剤層を介して熱圧着せしめる第3の工程と、
前記接着剤層を熱硬化せしめる第4の工程と、
を含むことを特徴とする半導体パッケージの製造方法。 - 請求項3に記載の半導体パッケージの製造方法により得られることを特徴とする半導体パッケージ。
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CN113874456A (zh) * | 2020-03-13 | 2021-12-31 | 古河电气工业株式会社 | 切晶粘晶膜、以及使用了该切晶粘晶膜的半导体封装及其制造方法 |
JP7356534B1 (ja) | 2022-03-30 | 2023-10-04 | 株式会社レゾナック | 半導体用接着フィルム、ダイシングダイボンディングフィルム、及び半導体装置を製造する方法 |
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CN113874456A (zh) * | 2020-03-13 | 2021-12-31 | 古河电气工业株式会社 | 切晶粘晶膜、以及使用了该切晶粘晶膜的半导体封装及其制造方法 |
CN113874456B (zh) * | 2020-03-13 | 2023-09-19 | 古河电气工业株式会社 | 切晶粘晶膜、以及使用了该切晶粘晶膜的半导体封装及其制造方法 |
JP7356534B1 (ja) | 2022-03-30 | 2023-10-04 | 株式会社レゾナック | 半導体用接着フィルム、ダイシングダイボンディングフィルム、及び半導体装置を製造する方法 |
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TW201612271A (en) | 2016-04-01 |
JP2016058457A (ja) | 2016-04-21 |
CN106575625A (zh) | 2017-04-19 |
SG11201701032XA (en) | 2017-04-27 |
KR101856914B1 (ko) | 2018-05-10 |
JP5901715B1 (ja) | 2016-04-13 |
MY182167A (en) | 2021-01-18 |
KR20170013386A (ko) | 2017-02-06 |
CN106575625B (zh) | 2019-02-26 |
PH12017500308A1 (en) | 2017-07-10 |
TWI589662B (zh) | 2017-07-01 |
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