WO2012121336A1 - 電子部品用接着剤及び半導体チップ実装体の製造方法 - Google Patents
電子部品用接着剤及び半導体チップ実装体の製造方法 Download PDFInfo
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- WO2012121336A1 WO2012121336A1 PCT/JP2012/055985 JP2012055985W WO2012121336A1 WO 2012121336 A1 WO2012121336 A1 WO 2012121336A1 JP 2012055985 W JP2012055985 W JP 2012055985W WO 2012121336 A1 WO2012121336 A1 WO 2012121336A1
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- Prior art keywords
- adhesive
- inorganic filler
- value
- electronic components
- compound
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—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
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
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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
- 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
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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
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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
- C09J185/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Adhesives based on derivatives of such polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—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
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- H—ELECTRICITY
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- 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
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
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- H01L2224/2929—Material of the matrix with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
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- 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
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
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- H01L2224/29299—Base material
- H01L2224/29386—Base material with a principal constituent of the material being a non metallic, non metalloid inorganic material
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- 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
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- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/8119—Arrangement of the bump connectors prior to mounting
- H01L2224/81191—Arrangement of the bump connectors prior to mounting wherein the bump connectors are disposed only on the semiconductor or solid-state body
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83192—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on another item or body to be connected to the semiconductor or solid-state body
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- 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
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/838—Bonding techniques
- H01L2224/8385—Bonding techniques using a polymer adhesive, e.g. an adhesive based on silicone, epoxy, polyimide, polyester
- H01L2224/83855—Hardening the adhesive by curing, i.e. thermosetting
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
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- 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
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- 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
- H01L2924/30—Technical effects
- H01L2924/35—Mechanical effects
- H01L2924/351—Thermal stress
Definitions
- the present invention relates to an adhesive for electronic parts that suppresses generation of voids and hardly causes scooping up on the upper surface of a semiconductor chip. Moreover, this invention relates to the manufacturing method of the semiconductor chip mounting body using this adhesive agent for electronic components.
- Patent Literature 1 describes a method for manufacturing a semiconductor device in which a bump electrode of a semiconductor device and a terminal electrode of a substrate are electrically connected and then a sealing material is filled in a gap between the semiconductor device and the substrate. ing.
- Patent Document 1 describes that the purpose is to investigate the limit of viscosity and thixotropy characteristics necessary for obtaining good sealing properties of a sealing material, and the viscosity is 100 Pa ⁇ s or less and thixotropy is described. It is described that a sealing material made of a composition having an index of 1.1 or less can sufficiently penetrate into a small gap quickly and without generating bubbles in the gap when the sealing material is injected. Has been.
- Patent Document 2 describes a curable underfill bonding composition containing surface-treated nanoparticles that are substantially spherical, non-aggregated, amorphous, and solid as an underfill material.
- surface-modified nanoparticles can be used to provide an underfill adhesive that has a desirable coefficient of thermal expansion (CTE) and provides a useful viscosity range for use in capillary underfill methods. Is described.
- Patent Document 3 after applying a predetermined liquid sealing resin composition to a position where a semiconductor element on a circuit forming surface of an inorganic substrate or an organic substrate is mounted, the electrode of the semiconductor element and the circuit of the substrate are A method of manufacturing a semiconductor device is described in which the liquid sealing resin composition is cured simultaneously with bonding via bumps.
- Patent Document 3 cannot sufficiently eliminate the possibility of voids.
- the method described in Patent Document 3 has a problem that the sealing resin tends to crawl up on the upper surface of the semiconductor chip and contaminates the attachment of the bonding apparatus. Further, for example, when the underfill material described in Patent Document 2 is applied to the method described in Patent Document 3, there is a problem that voids are easily generated.
- the present invention is an adhesive for electronic parts containing a curable compound, a curing agent, and an inorganic filler, and the viscosity at 5 rpm measured at 25 ° C. using an E-type viscometer is A1 (Pa ⁇ s), when the viscosity at 0.5 rpm is A2 (Pa ⁇ s), A1 and A2 / A1 are within the range surrounded by the solid line and the broken line in FIG. 1 (however, the solid line is included but the broken line is
- the adhesive for electronic parts is 5 to 150 parts by weight of the curing agent and 60 to 400 parts by weight of the inorganic filler with respect to 100 parts by weight of the curable compound. It is. The present invention is described in detail below.
- a curable adhesive is used as an electronic component adhesive provided on the substrate in advance.
- an adhesive for electronic parts that contains a compound, a curing agent, and an inorganic filler at a predetermined blending ratio, and whose viscosity characteristics and thixotropic characteristics are within a predetermined range, the generation of voids is suppressed, and The present inventors have found that creeping of the adhesive for electronic components to the upper surface of the semiconductor chip can be suppressed, and the present invention has been completed.
- the adhesive for electronic parts of the present invention is an adhesive for electronic parts containing a curable compound, a curing agent, and an inorganic filler, and measured at 25 ° C. using an E-type viscometer at 5 rpm.
- A1 and A2 / A1 are within the range surrounded by the solid line and the broken line in FIG. However, it is included on the solid line but not on the broken line.
- the viscosity of the adhesive for electronic components is measured using an E-type viscosity measuring device such as VISCOMETER TV-22 (manufactured by TOKAI SANGYO CO. LTD).
- A2 / A1 means the viscosity A2 (Pa ⁇ s) at 5 rpm, the viscosity A2 (Pa ⁇ s) at 0.5 rpm, measured using an E-type viscometer at 25 ° C. of the adhesive for electronic components.
- This is an index indicating the thixotropic characteristics of the adhesive for electronic parts.
- the range surrounded by the solid line and the broken line in FIG. 1 is a range derived from the viscosity characteristics and thixotropy characteristics of the adhesive for electronic components measured in the examples and comparative examples.
- the horizontal axis is A1 (Pa ⁇ s), and the vertical axis is A2 / A1.
- A1 and A2 / A1 within the range surrounded by the solid and broken lines in FIG. 1, the protruding electrode of the semiconductor chip and the electrode portion of the substrate are brought into contact with each other, and the adhesive for electronic components is used as a sealing region. Even when bubbles are caught in the filling process, generation of voids can be suppressed, and further, creeping of the electronic component adhesive to the upper surface of the semiconductor chip can be suppressed.
- A1 is not particularly limited as long as A1 and A2 / A1 satisfy the range surrounded by the solid line and the broken line in FIG. 1, but a preferable lower limit is 25 Pa ⁇ s, and a preferable upper limit is 150 Pa ⁇ s. A more preferred lower limit is 30 Pa ⁇ s, and a more preferred upper limit is 130 Pa ⁇ s.
- A2 / A1 is not particularly limited as long as A1 and A2 / A1 satisfy the range surrounded by the solid and broken lines in FIG. 1, but the preferable lower limit is 2.2 and the preferable upper limit is 4.5. Yes, a more preferred lower limit is 2.5, a more preferred upper limit is 4, a still more preferred upper limit is 3.8, and a particularly preferred upper limit is 3.5.
- A1 and A2 / A1 are preferably within the range surrounded by the solid line in FIG. 3 among the range surrounded by the solid line and the broken line in FIG.
- the range surrounded by the solid line in FIG. 3 is a range obtained by connecting the outermost points among the points (A1, A2 / A1) obtained in the example.
- A1 and A2 / A1 are adjusted by adjusting the type and amount of each component such as a curable compound, a curing agent, an inorganic filler, and a surfactant included in the adhesive for electronic parts of the present invention. Can be within the range surrounded by the solid and broken lines in FIG.
- the adhesive for electronic components of this invention is excellent in sclerosis
- the curable compound preferably has an SP value of about 8 to 14 from the viewpoint of adjusting both the viscosity property and thixotropy property of the adhesive for electronic components to a desired range.
- the curable compound is not particularly limited, but preferably contains at least one compound selected from the group consisting of epoxy compounds, bismaleimide compounds, and episulfide compounds.
- the epoxy compound is not particularly limited.
- bisphenol type epoxy compounds such as bisphenol A type, bisphenol F type, bisphenol AD type, and bisphenol S type
- novolac type epoxy compounds such as phenol novolak type and cresol novolak type
- resorcinol type epoxy Compounds aromatic epoxy compounds such as trisphenolmethane triglycidyl ether, naphthalene type epoxy compounds, fluorene type epoxy compounds, dicyclopentadiene type epoxy compounds, polyether modified epoxy compounds, benzophenone type epoxy compounds, aniline type epoxy compounds, NBR modified Examples thereof include epoxy compounds, CTBN-modified epoxy compounds, and hydrogenated products thereof.
- a benzophenone type epoxy compound is preferable because quick curability is easily obtained.
- These epoxy compounds may be used independently and 2 or more types may be used together.
- examples of commercially available products include EXA-830-LVP, EXA-830-CRP (manufactured by DIC).
- examples of resorcinol type epoxy compounds as a commercial product, for example, EX-201 (manufactured by Nagase ChemteX Corporation) and the like can be mentioned.
- commercially available products include, for example, EX-931 (manufactured by Nagase ChemteX), EXA-4850-150 (manufactured by DIC), EP-4005 (manufactured by ADEKA) and the like.
- the amount of the epoxy compound is not particularly limited, but the preferable lower limit in 100 parts by weight of the adhesive for electronic components is 15 parts by weight, and the preferable upper limit is 60.
- the lower limit is 25 parts by weight, and the more preferable upper limit is 50 parts by weight.
- the bismaleimide compound is not particularly limited.
- thermal initiation type free commercially available from KAI Kasei Co., Ltd., Daiwa Kasei Kogyo Co., Ltd., Ciba Specialty Chemicals Co., National Starch & Chemical Co., etc.
- examples thereof include radical curable bismaleimide compounds.
- the blending amount of the bismaleimide compound is not particularly limited, but the preferred lower limit in 100 parts by weight of the adhesive for electronic parts is 15 parts by weight, and the preferred upper limit. Is 60 parts by weight, a more preferred lower limit is 25 parts by weight, and a more preferred upper limit is 50 parts by weight.
- the episulfide compound is not particularly limited as long as it has an episulfide group, and examples thereof include compounds in which the oxygen atom of the epoxy group of the epoxy compound is substituted with a sulfur atom.
- Specific examples of the episulfide compound include bisphenol type episulfide compounds (compounds in which the oxygen atom of the epoxy group of the bisphenol type epoxy compound is replaced with a sulfur atom), hydrogenated bisphenol type episulfide compounds, dicyclopentadiene type episulfide compounds, and biphenyl.
- Type episulfide compound phenol novolak type episulfide compound, fluorene type episulfide compound, polyether modified episulfide compound, butadiene modified episulfide compound, triazine episulfide compound, naphthalene type episulfide compound and the like. Of these, naphthalene type episulfide compounds are preferred. These episulfide compounds may be used independently and 2 or more types may be used together. The substitution from oxygen atoms to sulfur atoms may be in at least a part of the epoxy group, or the oxygen atoms of all epoxy groups may be substituted with sulfur atoms.
- examples of commercially available products include YL-7007 (hydrogenated bisphenol A type episulfide compound, manufactured by Mitsubishi Chemical Corporation).
- the said episulfide compound is easily synthesize
- the blending amount of the episulfide compound is not particularly limited, but the preferred lower limit in 100 parts by weight of the adhesive for electronic parts is 3 parts by weight, and the preferred upper limit is 12 parts.
- the lower limit is 6 parts by weight, and the more preferable upper limit is 9 parts by weight.
- the adhesive for electronic components of the present invention may contain a polymer compound having a functional group capable of reacting with the curable compound (hereinafter also simply referred to as a polymer compound having a functional group capable of reacting).
- a polymer compound having a functional group capable of reacting By including the polymer compound having a functional group capable of reacting, the adhesive for electronic components is improved in the bonding reliability when distortion due to heat occurs.
- an epoxy compound is used as the curable compound as the polymer compound having a reactive functional group
- Etc. a polymer compound having an epoxy group is preferable.
- the cured product of the adhesive for electronic components exhibits excellent flexibility.
- the polymer compound having an epoxy group is not particularly limited as long as it is a polymer compound having an epoxy group at a terminal and / or side chain (pendant position).
- an epoxy group-containing acrylic rubber an epoxy group-containing butadiene rubber Bisphenol type high molecular weight epoxy compound, epoxy group-containing phenoxy resin, epoxy group-containing acrylic resin, epoxy group-containing urethane resin, epoxy group-containing polyester resin and the like.
- an epoxy group-containing acrylic resin is preferable because it can contain a large amount of epoxy groups and the mechanical strength and heat resistance of the cured product of the adhesive for electronic components are further improved.
- These polymer compounds having an epoxy group may be used alone or in combination of two or more.
- the preferred lower limit of the weight average molecular weight of the polymer compound having an epoxy group is 10,000. It is. When the weight average molecular weight of the polymer compound having an epoxy group is less than 10,000, the flexibility of the cured product of the adhesive for electronic components may not be sufficiently improved.
- the preferred lower limit of the epoxy equivalent of the polymer compound having an epoxy group is preferably 200.
- the upper limit is 1000.
- the epoxy equivalent of the polymer compound having an epoxy group is less than 200, the flexibility of the cured product of the adhesive for electronic components may not be sufficiently improved.
- the epoxy equivalent of the polymer compound having an epoxy group exceeds 1000, the mechanical strength and heat resistance of the cured product of the adhesive for electronic components may be lowered.
- the compounding amount of the polymer compound having a functional group capable of reacting is not particularly limited.
- a preferred lower limit relative to parts by weight is 1 part by weight, and a preferred upper limit is 30 parts by weight.
- the amount of the polymer compound having a functional group capable of reacting is less than 1 part by weight, the adhesive for electronic parts may have reduced bonding reliability when heat distortion occurs.
- the blending amount of the polymer compound having a functional group capable of reacting exceeds 30 parts by weight, the cured product of the adhesive for electronic parts may have reduced mechanical strength, heat resistance and moisture resistance.
- curing agent is not specifically limited, A conventionally well-known hardening
- the curing agent include latent heat-curing acid anhydride-based curing agents such as trialkyltetrahydrophthalic anhydride, phenol-based curing agents, amine-based curing agents, and dicyandiamide.
- a cationic curing agent and a cationic catalyst-type curing agent may be used independently and 2 or more types may be used together.
- the blending amount of the curing agent is such that the lower limit with respect to 100 parts by weight of the curable compound is 5 parts by weight and the upper limit is 150 parts by weight. If the blending amount of the curing agent is less than 5 parts by weight, the cured product of the adhesive for electronic components may become brittle, or the curing agent may cause defects such as insufficient curing. When the compounding amount of the curing agent exceeds 150 parts by weight, the heat resistance of the cured product of the adhesive for electronic components is lowered.
- the adhesive for electronic components of the present invention preferably contains a curing accelerator in addition to the above-mentioned curing agent for the purpose of adjusting the curing speed or the curing temperature.
- the said hardening accelerator is not specifically limited, For example, an imidazole series hardening accelerator, a tertiary amine type hardening accelerator, etc. are mentioned. Of these, imidazole-based curing accelerators are preferable because the curing rate can be easily controlled. These hardening accelerators may be used independently and 2 or more types may be used together.
- the imidazole curing accelerator is not particularly limited.
- 1-cyanoethyl-2-phenylimidazole in which the 1-position of imidazole is protected with a cyanoethyl group or an imidazole curing accelerator with basicity protected with isocyanuric acid (trade name “ 2MA-OK ", manufactured by Shikoku Kasei Kogyo Co., Ltd.).
- 2MA-OK an imidazole curing accelerator with basicity protected with isocyanuric acid
- Examples of the curing accelerator include 2MZ, 2MZ-P, 2PZ, 2PZ-PW, 2P4MZ, C11Z-CNS, 2PZ-CNS, 2PZCNS-PW, 2MZ-A, 2MZA-PW, C11Z-A, 2E4MZ-A, 2MAOK-PW, 2PZ-OK, 2MZ-OK, 2PHZ, 2PHZ-PW, 2P4MHZ, 2P4MHZ-PW, 2E4MZ ⁇ BIS, VT, VT-OK, MAVT, MAVT-OK (above, manufactured by Shikoku Kasei Kogyo Co., Ltd.) Can be mentioned.
- the compounding quantity of the said hardening accelerator is not specifically limited, A preferable minimum is 1 weight part with respect to 100 weight part of said curable compounds, and a preferable upper limit is 10 weight part.
- the blending amount of the curing agent used is the theoretically required equivalent to the epoxy group in the epoxy compound to be used.
- the following is preferable.
- chlorine ions may be easily eluted by moisture from a cured product obtained by curing the adhesive for electronic components. That is, if the curing agent is excessive, for example, when the elution component is extracted from the cured product of the adhesive for electronic components with hot water, the pH of the extracted water becomes about 4 to 5, so that the chloride ion from the epoxy compound May elute in large quantities.
- the pH of pure water after 1 g of the cured product of the adhesive for electronic parts is immersed in 10 g of pure water at 100 ° C. for 2 hours is 6 to 8, and the pH is 6.5 to 7.5. More preferably.
- the adhesive for electronic parts of the present invention further comprises a surfactant (this book) having a functional group having a solubility parameter (SP value) of 13 or more and a functional group having a solubility parameter (SP value) of 9 or more and less than 13.
- a surfactant this book
- the inorganic filler has a hydrophobicity (M value) of 20 or less (also referred to as an inorganic filler (1) in this specification).
- the adhesive for electronic parts of the present invention further comprises a functional group having a solubility parameter (SP value) of less than 9 and a functional group having a solubility parameter (SP value) of 9 or more and less than 13.
- surfactant (2) in the present specification
- the inorganic filler has a degree of hydrophobicity (M value) of 45 or more (also referred to as inorganic filler (2) in the present specification). Is preferred.
- an adhesive for electronic parts containing an inorganic filler to a certain degree tends to have a high viscosity.
- a thixotropic agent is further added to such a high viscosity adhesive for electronic parts for the purpose of increasing the thixotropy characteristics, the viscosity becomes higher and the applicability decreases, and the thixotropy characteristics are adjusted. It was also difficult.
- the present inventor is sufficient only when an inorganic filler exhibiting a specific degree of hydrophobicity (M value) and a surfactant having a functional group exhibiting a specific solubility parameter (SP value) are selected and combined. Even when an inorganic filler is blended to such an extent that high reliability can be obtained, it becomes easy to adjust both the viscosity characteristics and the thixotropy characteristics within a desired range due to good interaction between the inorganic filler and the surfactant. I found out.
- the surfactant is adsorbed on the surface of the inorganic filler at the time of low shear.
- the viscosity is increased.
- the surfactant reduces the collision between the inorganic fillers, thereby reducing the viscosity. That is, the thixotropy characteristic is increased and the generation of voids can be suppressed.
- the adhesive for electronic parts containing the inorganic filler (1) and the surfactant (1) or the inorganic filler (2) and the surfactant (2) has such a high thixotropic property.
- the degree of hydrophobicity (M value) is an index representing hydrophobicity.
- the degree of hydrophobicity (M value) means the methanol concentration (% by weight) when methanol is dripped into water to which an inorganic filler is added and the inorganic filler is completely swollen.
- Examples of the method of adjusting the M value of the inorganic filler include a method of subjecting the inorganic filler to surface treatment and changing the number of hydrophilic groups present on the surface. Specifically, for example, a method of adjusting the M value by modifying the surface of the silica fine particle with —CH 3 to adjust the carbon content, and the like can be mentioned.
- the solubility parameter (SP value) is an index representing hydrophilicity.
- ⁇ means SP value
- E means cohesive energy
- V means molar volume.
- the inorganic filler (1) has a hydrophobicity (M value) of 20 or less, and the surfactant (1) has a functional group having a solubility parameter (SP value) of 13 or more, and a solubility parameter (SP Value) is 9 or more and less than 13.
- the inorganic filler When the inorganic filler has an M value of more than 20, good interaction with the surfactant (1) cannot be obtained, and the effect of adjusting thixotropy characteristics decreases. As for the said inorganic filler (1), it is more preferable that M value is 18 or less.
- M value is 18 or less.
- the inorganic filler (1) include fine particles made of silica, titanium oxide, black carbon, alumina, graphene, mica, or the like having an M value of 20 or less. Among these, silica fine particles having an M value of 20 or less are preferable. These inorganic fillers (1) may be used independently and 2 or more types may be used together.
- kits for the inorganic filler (1) include, for example, SE-2050 (M value is 0, carbon content is 0% by weight, manufactured by Admatechs), SE-2050-SET (M value is 20, carbon content is included) SE-2050-SEJ (M value is 20, carbon content is 0% by weight, manufactured by Admatechs), SE-1050 (M value is 0, carbon content is 0% by weight, manufactured by Admatechs) 0 wt%, manufactured by Admatechs), SE-4050 (M value is 0, carbon content is 0 wt%, manufactured by Admatechs), UFP-80 (M value is 20, manufactured by Denki Kagaku), QS- 40 (M value is 0, carbon content is 0% by weight, manufactured by Tokuyama Corporation) and the like.
- SE-2050 M value is 0, carbon content is 0% by weight, manufactured by Admatechs
- SE-2050-SET M value is 20, carbon content is included
- SE-2050-SEJ M value is 20, carbon content is 0% by weight, manufactured by Admatechs
- SE-1050
- the adhesive for electronic components containing the said inorganic filler (1) and the said surfactant (1) is in the range which does not inhibit the effect of this invention, for example, the linear expansion coefficient of the adhesive for electronic components will be shown.
- an inorganic filler having an M value exceeding 20 may be contained.
- the preferable lower limit of the amount of the inorganic filler (1) is 10% by weight in the whole inorganic filler. If the blending amount is less than 10% by weight, the effect of adjusting the thixotropy characteristics may not be sufficiently obtained.
- a more preferable minimum is 15 weight% among the whole inorganic fillers.
- the surfactant having no functional group having the SP value of 13 or more or the functional group having the SP value of 9 or more and less than 13 there is a good interaction with the inorganic filler (1). It cannot be obtained, and the effect of adjusting the thixotropy characteristics is reduced.
- the functional group having the SP value of 13 or more preferably has an SP value of 16 or more.
- the functional group having an SP value of 9 or more and less than 13 has a more preferred lower limit of the SP value of 9.5 and a more preferred upper limit of 12.5.
- Examples of the functional group having an SP value of 13 or more include a primary amine group (SP value 16.5), a carbinol group (SP value 16.58), a carboxyl group (SP value 15.28), and a phosphate group. (SP value 13.36).
- Examples of the functional group having an SP value of 9 or more and less than 13 include an epoxy group (SP value 12.04), a propoxymethyloxirane group (SP value 9.78), a mercapto group (SP value 11.07), A methacryloyl group (SP value 9.60), a phenol group (SP value 11.5), a polyether group (SP value 9.71), etc. are mentioned.
- the surfactant (1) examples include a silicone compound, an anionic surfactant having a functional group having the SP value of 13 or more and a functional group having the SP value of 9 or more and less than 13.
- examples include cationic surfactants, amphoteric surfactants, and nonionic surfactants.
- a silicone compound is preferable.
- These surfactants (1) may be used independently and 2 or more types may be used together.
- a commercially available product of the surfactant (1) for example, BYK-W9010 (manufactured by Big Chemie Japan, having a phosphate group with an SP value of 13.36 and a polyether group with an SP value of 9.71)
- X-22-3939A amino-polyether-modified silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., having a primary amine group with an SP value of 16.5 and a polyether group with an SP value of 9.71
- a preferable minimum is 0.4 weight part and a preferable upper limit is 4 weight part with respect to 100 weight part of said inorganic fillers (1). If the blending amount is less than 0.4 parts by weight, the effect of adjusting the thixotropy characteristics may not be sufficiently obtained. If the blending amount exceeds 4 parts by weight, the surfactant (1) may volatilize and cause voids when the resulting adhesive for electronic parts is thermally cured. As for the compounding quantity of the said surfactant (1), a more preferable minimum is 0.8 weight part with respect to 100 weight part of said inorganic fillers (1), and a more preferable upper limit is 2 weight part.
- the inorganic filler (2) has a hydrophobicity (M value) of 45 or more, and the surfactant (2) has a functional group having a solubility parameter (SP value) of less than 9, and a solubility parameter (SP Value) is 9 or more and less than 13.
- an inorganic filler having an M value of less than 45 good interaction with the surfactant (2) cannot be obtained, and the effect of adjusting thixotropy characteristics is reduced.
- the inorganic filler (2) include fine particles made of silica, titanium oxide, black carbon, alumina, graphene, mica and the like having an M value of 45 or more. Among these, silica fine particles having an M value of 45 or more are preferable. These inorganic fillers (2) may be used independently and 2 or more types may be used together.
- the inorganic filler (2) include, for example, SE-2050-STJ (M value 64, manufactured by Admatechs), SE-1050-STT (M value 64, manufactured by Admatex), fumed Silica (MT-10, M value 47, carbon content 0.9% by weight, manufactured by Tokuyama Corporation), fumed silica (HM-20L, M value 64, carbon content 2.4% by weight, Tokuyama And fumed silica (PM-20L, M value is 65, carbon content is 5.5% by weight, manufactured by Tokuyama Corporation), and the like.
- SE-2050-STJ M value 64, manufactured by Admatechs
- SE-1050-STT M value 64, manufactured by Admatex
- fumed Silica MT-10, M value 47, carbon content 0.9% by weight, manufactured by Tokuyama Corporation
- fumed silica HM-20L, M value 64, carbon content 2.4% by weight
- Tokuyama And fumed silica PM-20L, M value is 65, carbon content is 5.5% by weight, manufactured by Tokuyama Corporation
- the adhesive for electronic components containing the said inorganic filler (2) and the said surfactant (2) is in the range which does not inhibit the effect of this invention, for example, the linear expansion coefficient of the adhesive for electronic components will be shown.
- an inorganic filler having an M value of less than 45 may be contained.
- the preferable lower limit of the amount of the inorganic filler (2) is 10% by weight in the whole inorganic filler. If the blending amount is less than 10% by weight, the effect of adjusting the thixotropy characteristics may not be sufficiently obtained.
- a more preferable minimum is 15 weight% among the whole inorganic fillers.
- Examples of the functional group having an SP value of less than 9 include a methyl group (SP value 6.44), an ethyl group (SP value 6.97), a butyl group (SP value 7.39), and a dimethylsiloxane group (SP value). 7.40).
- Examples of the functional group having an SP value of 9 or more and less than 13 include an epoxy group (SP value 12.04), a propoxymethyloxirane group (SP value 9.78), a mercapto group (SP value 11.07), A methacryloyl group (SP value 9.60), a phenol group (SP value 11.5), a polyether group (SP value 9.71), etc. are mentioned.
- Examples of the surfactant (2) include a silicone compound, an anionic surfactant having a functional group having an SP value of less than 9 and a functional group having an SP value of 9 or more and less than 13.
- Examples include cationic surfactants, amphoteric surfactants, and nonionic surfactants.
- a silicone compound is preferable.
- These surfactants (1) may be used independently and 2 or more types may be used together.
- the surfactant (2) include, for example, epoxy-modified silicone oil (KF-101, manufactured by Shin-Etsu Chemical Co., Ltd., an epoxy group having an SP value of 12.04, and a dimethylsiloxane group having an SP value of 7.40.
- Carboxyl-modified silicone oil (X-22-162C, manufactured by Shin-Etsu Chemical Co., Ltd., having a carboxyl ethyl group having an SP value of 11.10 and a dimethylsiloxane group having an SP value of 7.40), epoxy Polyether-modified silicone oil (X-22-4741, manufactured by Shin-Etsu Chemical Co., Ltd., an epoxy group having an SP value of 12.04, a polyether group having an SP value of 9.71, and dimethyl having an SP value of 7.55 Having a siloxane group).
- a preferable minimum is 0.4 weight part and a preferable upper limit is 4 weight part with respect to 100 weight part of said inorganic fillers (2). If the blending amount is less than 0.4 parts by weight, the effect of adjusting the thixotropy characteristics may not be sufficiently obtained. If the blending amount exceeds 4 parts by weight, the surfactant (2) may volatilize and cause voids when the resulting adhesive for electronic parts is thermally cured. As for the compounding quantity of the said surfactant (2), a more preferable minimum is 0.8 weight part with respect to 100 weight part of said inorganic fillers (2), and a more preferable upper limit is 2 weight part.
- the inorganic filler has a preferable minimum of an average particle diameter of 0.1 micrometer, and a preferable upper limit of 3 micrometers.
- the average particle diameter is within the above range, it becomes easy to adjust A1 and A2 / A1 within the range surrounded by the solid line and the broken line in FIG. It is possible to better suppress the creeping up.
- the average particle diameter is less than 0.1 ⁇ m, the adhesive for electronic components is likely to thicken, and the adhesive for electronic components is not sufficiently wetted and spread when filling the sealing area with the adhesive for electronic components.
- the occurrence of voids may not be suppressed.
- the average particle diameter exceeds 3 ⁇ m, the inorganic filler may be caught between the electrodes.
- the minimum with a more preferable average particle diameter of the said inorganic filler is 0.3 micrometer, a more preferable upper limit is 1 micrometer, Furthermore, a preferable upper limit is 0.5 micrometer.
- the inorganic filler is preferably surface-treated, and as a result, preferably has a group derived from the surface treatment agent on the surface.
- A1 and A2 / A1 are surrounded by a solid line and a broken line in FIG. Therefore, it is possible to more easily suppress the generation of voids and the creeping of the adhesive for electronic components to the upper surface of the semiconductor chip.
- the said inorganic filler is highly filled in the adhesive for electronic components, the linear expansion coefficient after hardening of the adhesive for electronic components can be maintained low, and the joining reliability of the adhesive for electronic components improves.
- Examples of the surface treatment agent include amino silane compounds, methyl silane compounds, vinyl silane compounds, styryl silane compounds, mercapto silane compounds, phenyl silane compounds, (meth) acryl silane compounds, and epoxy silane compounds. Of these, a phenylsilane compound or a (meth) acrylsilane compound is preferable.
- Examples of the phenylsilane compound include N-phenyl-3-aminopropyltrimethoxysilane.
- Examples of the (meth) acrylsilane compound include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, and 3-methacryloxypropylmethyldiethoxysilane. It is done.
- epoxysilane compound examples include 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3-glycidoxypropylmethyl. Examples include dimethoxysilane and 3-glycidoxypropylmethyldiethoxysilane.
- the blending amount of the inorganic filler is such that the lower limit with respect to 100 parts by weight of the curable compound is 60 parts by weight and the upper limit is 400 parts by weight.
- the adhesive for electronic components cannot maintain sufficient bonding reliability.
- the blending amount of the inorganic filler exceeds 400 parts by weight, the adhesive for electronic components is likely to thicken, and the adhesive for electronic components is sufficiently wet when filling the adhesive for electronic components into the sealing region. It does not spread and the generation of voids cannot be suppressed.
- the compounding quantity of the said inorganic filler the preferable minimum with respect to 100 weight part of said curable compounds is 66 weight part, and a preferable upper limit is 300 weight part.
- A1 and A2 / A1 are shown in FIG. It may not be within the range enclosed by the solid and broken lines.
- an inorganic filler having a group derived from the phenylsilane compound or the (meth) acrylsilane compound on the surface and an inorganic filler having a group derived from the epoxysilane compound on the surface are used in combination.
- A1 and A2 / A1 within a range surrounded by a solid line and a broken line in FIG.
- an inorganic filler having a group derived from the phenylsilane compound or the (meth) acrylsilane compound on the surface and an inorganic filler having a group derived from the epoxysilane compound on the surface are used in combination
- the preferable lower limit of the blending amount of the inorganic filler having a group derived from the epoxysilane compound on the surface thereof is 20 weights with respect to 100 parts by weight of the inorganic filler having a group derived from the phenylsilane compound or the (meth) acrylsilane compound. Parts, and a preferred upper limit is 150 parts by weight.
- a thixotropy imparting agent as said inorganic filler.
- the thixotropy-imparting agent it becomes easy to adjust A1 and A2 / A1 within the range surrounded by the solid line and the broken line in FIG. 1, generating voids and applying the adhesive for electronic components to the upper surface of the semiconductor chip. Crawling can be suppressed more favorably.
- the thixotropy-imparting agent is not particularly limited, and examples thereof include inorganic fine particles such as metal fine particles, calcium carbonate, fumed silica, aluminum oxide, boron nitride, aluminum nitride, and aluminum borate. Of these, fumed silica is preferable.
- the thixotropy-imparting agent may be subjected to a surface treatment as necessary.
- the thixotropy imparting agent subjected to the above surface treatment is not particularly limited, but particles having a hydrophobic group on the surface are preferable, and specific examples include fumed silica having a hydrophobic surface.
- the average particle diameter of the particulate thixotropy-imparting agent is not particularly limited, but a preferable upper limit is 1 ⁇ m.
- a preferable upper limit is 1 ⁇ m.
- the blending amount of the thixotropy-imparting agent in the adhesive for electronic components of the present invention is not particularly limited. However, when the thixotropy-imparting agent is not subjected to surface treatment, a preferable lower limit is 0.5% by weight and a preferable upper limit is 20 % By weight. If the amount of the thixotropy-imparting agent is less than 0.5% by weight, sufficient thixotropy characteristics may not be imparted to the adhesive for electronic components. When the blending amount of the thixotropy-imparting agent exceeds 20% by weight, the eliminability of the adhesive for electronic components may be lowered when manufacturing a semiconductor device. The more preferable lower limit of the amount of the thixotropy-imparting agent is 3% by weight, and the more preferable upper limit is 10% by weight.
- the adhesive for electronic components of the present invention may contain a diluent in order to reduce the viscosity.
- the diluent preferably has an epoxy group, and the preferable lower limit of the number of epoxy groups in one molecule is 2, and the preferable upper limit is 4. If the number of epoxy groups in one molecule is less than 2, sufficient heat resistance may not be exhibited after the adhesive for electronic parts is cured. If the number of epoxy groups in one molecule exceeds 4, distortion due to curing may occur, or uncured epoxy groups may remain, which may result in poor bonding strength or poor bonding due to repeated thermal stress. May occur.
- a more preferable upper limit of the number of epoxy groups in one molecule of the diluent is 3.
- the diluent preferably has an aromatic ring and / or a dicyclopentadiene structure.
- the preferable upper limit of the weight loss at 120 ° C. and the weight loss at 150 ° C. is 1%. If the weight loss at 120 ° C. and the weight loss at 150 ° C. exceed 1%, unreacted materials will volatilize during or after curing of the adhesive for electronic components, resulting in productivity or the obtained semiconductor device. May adversely affect performance.
- the diluent preferably has a lower curing start temperature and a higher curing rate than the curable compound.
- the preferred lower limit of the blending amount of the diluent in the adhesive for electronic components of the invention is 1% by weight, and the preferred upper limit is 20% by weight.
- the viscosity of the adhesive for electronic parts may not be sufficiently reduced.
- the adhesive for electronic components of the present invention may contain a solvent, if necessary.
- the solvent is not particularly limited, and examples thereof include aromatic hydrocarbons, chlorinated aromatic hydrocarbons, chlorinated aliphatic hydrocarbons, alcohols, esters, ethers, ketones, glycol ethers (cellosolves), and fats. Examples thereof include cyclic hydrocarbons and aliphatic hydrocarbons.
- the adhesive for electronic components of the present invention may contain an inorganic ion exchanger as necessary.
- examples of commercially available products include IXE series (manufactured by Toagosei Co., Ltd.).
- the amount of the inorganic ion exchanger is not particularly limited, but the preferable upper limit is 10% by weight and the preferable lower limit is 1% by weight.
- the adhesive for electronic components of this invention may contain other additives, such as adhesive imparting agents, such as a bleed inhibitor and an imidazole silane coupling agent, as needed.
- the preferable lower limit of the linear expansion coefficient at 40 to 80 ° C. after curing is 20 ppm / ° C.
- the preferable upper limit is 50 ppm / ° C.
- the linear expansion coefficient is less than 20 ppm / ° C.
- the linear expansion coefficient is lower than that of the protruding electrode and the substrate of the semiconductor chip, so that stress is concentrated on the joint due to the thermal expansion of the protruding electrode and the substrate. , Peeling may occur. That is, the adhesive for electronic components may not be able to maintain sufficient bonding reliability.
- the lower limit of the linear expansion coefficient at 40 to 80 ° C. after curing is more preferably 25 ppm / ° C., and the more preferable upper limit is 45 ppm / ° C.
- the method for producing the adhesive for electronic components of the present invention is not particularly limited.
- the components such as a curable compound, a curing agent, an inorganic filler, and a surfactant are stirred using a homodisper or the like.
- the method of mixing etc. is mentioned.
- the use of the adhesive for electronic components of the present invention is not particularly limited, but it is suitably used in a method for manufacturing a semiconductor chip mounting body in which a semiconductor chip having protruding electrodes is bonded to a substrate by flip chip mounting and sealed. .
- the manufacturing method of a semiconductor chip mounting body of the present invention is a manufacturing method of a semiconductor chip mounting body in which a semiconductor chip having protruding electrodes is bonded to a substrate by flip chip mounting and sealed.
- the step of providing the electronic component adhesive of the present invention on a substrate is performed.
- the method for providing the electronic component adhesive on the substrate is not particularly limited, and examples thereof include a method of applying the electronic component adhesive using a combination of a syringe equipped with a precision nozzle and a dispenser.
- the protruding electrode of the semiconductor chip and the electrode portion of the substrate are then brought into contact with each other through the adhesive for electronic components and the adhesive for electronic components is used as a sealing region.
- a filling step is performed. In the step, it is preferable to press against the semiconductor chip to bring the protruding electrode of the semiconductor chip into contact with the electrode portion of the substrate and to fill the sealing region with an adhesive for electronic components.
- the pressure at the time of pressing is not particularly limited, but it is preferably 0.1 to 10 N per protruding electrode. If the pressure is less than 0.1 N, the protruding electrode of the semiconductor chip and the electrode of the substrate may not contact each other.
- the protruding electrode of the semiconductor chip When the pressure exceeds 10 N, the protruding electrode of the semiconductor chip may be crushed too much to come into contact with the adjacent protruding electrode and cause a short circuit.
- the temperature and time when the protruding electrode of the semiconductor chip and the electrode portion of the substrate are brought into contact with each other and the adhesive for electronic components is filled in the sealing region are within a range that does not hinder the effect of the present invention. For example, 120 to 220 ° C., 1 to 30 N, 0.1 to 60 seconds and the like can be mentioned.
- the protruding electrode of the semiconductor chip When the protruding electrode of the semiconductor chip is solder, it may be heated at a temperature lower than the melting temperature of the solder.
- the process of bonding the protruding electrode of the semiconductor chip and the electrode portion of the substrate and curing the adhesive for electronic components at the bonding portion is then performed.
- the temperature and time when the protruding electrode of the semiconductor chip and the electrode portion of the substrate are bonded and the adhesive for the electronic component of the bonding portion is cured are particularly limited as long as the effects of the present invention are not impaired. For example, 230 to 300 ° C., 1 to 30 N, 0.1 to 60 seconds and the like can be mentioned.
- the protruding electrode of the semiconductor chip is solder, it may be heated at a temperature equal to or higher than the melting temperature of the solder.
- a step of completely curing the adhesive for electronic components is further performed. Thereby, the adhesive for electronic components is completely cured, and a semiconductor chip mounting body in which the protruding electrodes of the semiconductor chip and the electrode portions of the substrate are joined is obtained.
- Curing conditions for completely curing the adhesive for electronic components are not particularly limited, and curing conditions suitable for the curing characteristics of the adhesive for electronic components can be appropriately selected and used, for example, at 120 ° C. for 30 minutes, Examples include 30 minutes at 170 ° C.
- A1 and A2 / A1 are within the range surrounded by the solid line and the broken line in FIG. 1 so that the protruding electrode of the semiconductor chip and the electrode part of the substrate are in contact with each other.
- generation of voids can be suppressed even when bubbles are caught in the sealing process of the electronic component adhesive into the sealing region.
- the creeping of the adhesive for electronic components to the upper surface of the semiconductor chip can be suppressed.
- the adhesive agent for electronic components which suppresses generation
- the manufacturing method of the semiconductor chip mounting body using this adhesive agent for electronic components can be provided.
- Examples 1 to 33 and Comparative Examples 1 to 20 (1) Production of adhesive for electronic parts According to the composition shown in Tables 1 to 4, the following materials (parts by weight) were stirred and mixed using a homodisper to prepare an adhesive for electronic parts. About the obtained adhesive for electronic components, using an E-type viscosity measuring device (VISCOMETER TV-22, manufactured by TOKAI SANGYO CO. LTD), at a setting temperature of 25 ° C., with a viscosity A1 at a rotational speed of 5 rpm and at 0.5 rpm Viscosity A2 was measured. Tables 1 to 4 show A1, A2, and A2 / A1.
- the horizontal axis is A1 (Pa ⁇ s) and the vertical axis is A2 / A1, and the relationship between A1 and A2 / A1 obtained in Examples 1 to 33 and Comparative Examples 1 to 12 and 14 to 20 is plotted.
- a graph is shown in FIG.
- the example was plotted with a circle (open), and the comparative example was plotted with a rhombus (filled).
- the obtained adhesive for electronic parts was cured at 170 ° C. for 30 minutes, and then TMA / SS6000 (manufactured by Seiko Instruments) was used at 30 to 300 ° C. (temperature increase of 10 ° C.) in a tensile mode. ) Stretching was performed for 2 cycles, and the linear expansion coefficient was determined from the curve of the second cycle.
- Epoxy compound Aniline type epoxy compound (EP-3900S, manufactured by Adeka) Naphthalene type epoxy compound (EXA-4710, manufactured by Adeka) Glycidylamine type epoxy compound (YH-434L, manufactured by Nippon Steel Chemical Co., Ltd.) Bisphenol F type epoxy compound (EXA-830CRP, manufactured by DIC)
- methyl isobutyl ketone was distilled off at 90 ° C. under reduced pressure using a rotary evaporator to obtain 101.2 g of a naphthalene type episulfide compound as a colorless and transparent liquid.
- Hardener acid anhydride hardener (YH-307, manufactured by JER) Acid anhydride curing agent (YH-306, manufactured by JER) Phenol curing agent (MEH-8000H, manufactured by Meiwa Kasei Co., Ltd.)
- Inorganic filler 6-1 Inorganic filler having an M value of 20 or less (inorganic filler (1)) SE-2050 (silica filler, manufactured by Admatechs, average particle size 0.5 ⁇ m, maximum particle size 3 ⁇ m, no surface treatment, M value 0) SE-1050 (silica filler, manufactured by Admatechs, average particle size 0.3 ⁇ m, maximum particle size 1 ⁇ m, no surface treatment, M value 0) SE-4050 (silica filler, manufactured by Admatechs, average particle size 1 ⁇ m, maximum particle size 5 ⁇ m, no surface treatment, M value 0) SE-1050-SET (silica filler, manufactured by Admatechs, average particle size 0.3 ⁇ m, maximum particle size 1 ⁇ m, inorganic filler having a group derived from an epoxysilane compound, M value 20)
- Inorganic filler having an M value of 45 or more (inorganic filler (2)) MT-10 (fumed silica, manufactured by Tokuyama, M value 47) SE-2050-STJ (silica filler, manufactured by Admatechs, average particle size 0.5 ⁇ m, maximum particle size 3 ⁇ m, inorganic filler having a group derived from a methylsilane compound, M value 64) SE-1050-STT (silica filler, manufactured by Admatechs, average particle size 0.3 ⁇ m, maximum particle size 1 ⁇ m, inorganic filler having a group derived from a methylsilane compound, M value 64) PM-20L (fumed silica, manufactured by Tokuyama, M value 65)
- Surfactant 7-1 Surfactant (surfactant (1)) having a functional group having an SP value of 13 or more and a functional group having an SP value of 9 or more and less than 13.
- BYK-W9010 silicone compound, manufactured by Big Chemie Japan, having a phosphate group with an SP value of 13.36 and a polyether group with an SP value of 9.71
- X-22-3939A Amino / polyether-modified silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., having a primary amine group having an SP value of 16.5 and a polyether group having an SP value of 9.71
- KF-101 epoxy-modified silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., having an epoxy group with an SP value of 12.04 and a dimethylsiloxane group with an SP value of 7.40
- X-22-4741 epoxy / polyether-modified silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., having an epoxy group having an SP value of 12.04 and a dimethylsiloxane group having an SP value of 7.55
- a semiconductor chip having a protruding electrode made of solder (WALTS) is pressed at 140 ° C. and 20 N for 1 second using a flip chip bonder (FC3000S, manufactured by Toray Engineering Co., Ltd.) through the applied adhesive for electronic components.
- FC3000S flip chip bonder
- FC3000S flip chip bonder
- FC3000S flip chip bonder
- FC3000S solder melting temperature 235 ° C., manufactured by Waltz
- the electrode part of the substrate were brought into contact with each other, and an adhesive for electronic parts was filled in the sealing region.
- the adhesive for electronic components of a junction part was hardened by heating at 260 degreeC and 1N for 3 second.
- the adhesive for electronic components was completely cured by curing in an oven at 170 ° C. for 30 minutes to obtain a semiconductor chip mounting body.
- the adhesive agent for electronic components which suppresses generation
- the manufacturing method of the semiconductor chip mounting body using this adhesive agent for electronic components can be provided.
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Abstract
Description
特許文献1には、封止材の良好な封止特性を得るために必要な粘度とチクソトロピー特性の限界を究明することを目的としたことが記載されており、粘度が100Pa・s以下でチクソトロピー指数が1.1以下である組成物からなる封止材であれば、封止材の注入時に間隙に速やかにかつ気泡を生じることなく小さな間隙にも十分浸透することが可能となることが記載されている。
この問題を解決するために、例えば、封止樹脂を電極接合後に充填するのではなく、接合領域に予め封止樹脂を設けておく方法が検討されている。例えば、特許文献3には、無機基板または有機基板の回路形成面の半導体素子を搭載する位置に所定の液状封止樹脂組成物を塗布した後、前記半導体素子の電極と前記基板の回路を、バンプを介して接合すると同時に前記液状封止樹脂組成物の硬化を行う半導体装置の製造方法が記載されている。
以下、本発明を詳述する。
なお、図1の実線及び破線で囲まれた範囲は、実施例及び比較例で測定した電子部品用接着剤の粘度特性及びチクソトロピー特性から導かれた範囲である。
A1が大きすぎることによりA1とA2/A1とが図1の実線及び破線で囲まれた範囲内を満たさない場合には、電子部品用接着剤を封止領域に充填する際に電子部品用接着剤が充分にぬれ広がらず、ボイドの発生を抑制することが困難となる。
A2/A1が大きすぎることによりA1とA2/A1とが図1の実線及び破線で囲まれた範囲内を満たさない場合には、半導体チップの突起状電極と基板の電極部とを接触又は接合する際に電子部品用接着剤の半導体チップ上面への這い上がりを充分に抑制することができず、電子部品用接着剤がボンディング装置のアタッチメントに付着しやすくなる。
なお、図3の実線で囲まれた範囲は、実施例で得られた(A1,A2/A1)の点のうち最も外側に位置する点を繋ぐことにより得られた範囲である。
上記硬化性化合物は特に限定されないが、エポキシ化合物、ビスマレイミド化合物、エピスルフィド化合物からなる群より選択される少なくとも1つの化合物を含有することが好ましい。
上記レゾルシノール型エポキシ化合物のうち、市販品として、例えば、EX-201(ナガセケムテックス社製)等が挙げられる。
上記ポリエーテル変性エポキシ化合物のうち、市販品として、例えば、EX-931(ナガセケムテックス社製)、EXA-4850-150(DIC社製)、EP-4005(アデカ社製)等が挙げられる。
上記エピスルフィド化合物として、具体的には例えば、ビスフェノール型エピスルフィド化合物(ビスフェノール型エポキシ化合物のエポキシ基の酸素原子を硫黄原子に置換した化合物)、水添ビスフェノール型エピスルフィド化合物、ジシクロペンタジエン型エピスルフィド化合物、ビフェニル型エピスルフィド化合物、フェノールノボラック型エピスルフィド化合物、フルオレン型エピスルフィド化合物、ポリエーテル変性エピスルフィド化合物、ブタジエン変性エピスルフィド化合物、トリアジンエピスルフィド化合物、ナフタレン型エピスルフィド化合物等が挙げられる。なかでも、ナフタレン型エピスルフィド化合物が好ましい。これらのエピスルフィド化合物は、単独で用いられてもよく、2種以上が併用されてもよい。
なお、酸素原子から硫黄原子への置換は、エポキシ基の少なくとも一部におけるものであってもよく、すべてのエポキシ基の酸素原子が硫黄原子に置換されていてもよい。
上記硬化促進剤は特に限定されず、例えば、イミダゾール系硬化促進剤、3級アミン系硬化促進剤等が挙げられる。なかでも、硬化速度の制御をしやすいことから、イミダゾール系硬化促進剤が好ましい。これらの硬化促進剤は、単独で用いられてもよく、2種以上が併用されてもよい。
或いは、本発明の電子部品用接着剤は、更に、溶解度パラメータ(SP値)が9未満である官能基と、溶解度パラメータ(SP値)が9以上13未満である官能基とを有する界面活性剤(本明細書中、界面活性剤(2)ともいう)を含有し、無機充填剤は、疎水化度(M値)が45以上である(本明細書中、無機充填剤(2)ともいう)ことが好ましい。
また、無機充填剤(1)と界面活性剤(1)、又は、無機充填剤(2)と界面活性剤(2)を含有する電子部品用接着剤は、このようにチクソトロピー特性が大きくても必要以上に増粘することがなく、塗布性にも優れる。更に、粘度特性とチクソトロピー特性との両方が所望の範囲に調整されるため、電子部品用接着剤の半導体チップ上面への這い上がりを抑制することもできる。
無機充填剤のM値を調整する方法としては、例えば、無機充填剤に表面処理を施し、表面に存在する親水性基の数を変化させる方法等が挙げられる。具体的には例えば、シリカ微粒子の表面を-CH3で修飾して炭素含有量を調整することによりM値を調整する方法等が挙げられる。このような方法により炭素含有量を調整したシリカ微粒子は、例えば、トクヤマ社等から市販されている。
一方、溶解度パラメータ(SP値)は、親水性を表す指標である。溶解度パラメータ(SP値)は、フェドールの方法により、δ2=ΣE/ΣVの式から計算値として求めることができる。ここで、δはSP値、Eは凝集エネルギー、Vはモル体積を意味している。
上記無機充填剤(1)は、疎水化度(M値)が20以下であり、上記界面活性剤(1)は、溶解度パラメータ(SP値)が13以上である官能基と、溶解度パラメータ(SP値)が9以上13未満である官能基とを有する。
上記無機充填剤(1)としては、例えば、M値が20以下である、シリカ、酸化チタン、ブラックカーボン、アルミナ、グラフェン、マイカ等からなる微粒子が挙げられる。なかでも、M値が20以下であるシリカ微粒子が好ましい。これらの無機充填剤(1)は、単独で用いられてもよく、2種以上が併用されてもよい。
上記無機充填剤(2)は、疎水化度(M値)が45以上であり、上記界面活性剤(2)は、溶解度パラメータ(SP値)が9未満である官能基と、溶解度パラメータ(SP値)が9以上13未満である官能基とを有する。
上記無機充填剤(2)としては、例えば、M値が45以上である、シリカ、酸化チタン、ブラックカーボン、アルミナ、グラフェン、マイカ等からなる微粒子が挙げられる。なかでも、M値が45以上であるシリカ微粒子が好ましい。これらの無機充填剤(2)は、単独で用いられてもよく、2種以上が併用されてもよい。
上記無機充填剤は、平均粒子径の好ましい下限が0.1μm、好ましい上限が3μmである。上記平均粒子径が上記範囲内であると、A1とA2/A1とを図1の実線及び破線で囲まれた範囲内に調整しやすくなり、ボイドの発生及び電子部品用接着剤の半導体チップ上面への這い上がりを、より良好に抑制することができる。上記平均粒子径が0.1μm未満であると、電子部品用接着剤が増粘しやすくなり、電子部品用接着剤を封止領域に充填する際に電子部品用接着剤が充分にぬれ広がらず、ボイドの発生を抑制できないことがある。上記平均粒子径が3μmを超えると、電極間に上記無機充填剤を噛みこんでしまうことがある。上記無機充填剤の平均粒子径のより好ましい下限は0.3μm、より好ましい上限は1μm、更に好ましい上限は0.5μmである。
上記表面処理剤として、例えば、アミノシラン化合物、メチルシラン化合物、ビニルシラン化合物、スチリルシラン化合物、メルカプトシラン化合物、フェニルシラン化合物、(メタ)アクリルシラン化合物、エポキシシラン化合物等が挙げられる。なかでも、フェニルシラン化合物又は(メタ)アクリルシラン化合物が好ましい。
上記(メタ)アクリルシラン化合物として、例えば、3-メタクリロキシプロピルトリメトキシシラン、3-メタクリロキシプロピルトリエトキシシラン、3-メタクリロキシプロピルメチルジメトキシシラン、3-メタクリロキシプロピルメチルジエトキシシラン等が挙げられる。
上記エポキシシラン化合物として、例えば、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルトリエトキシシラン、3-グリシドキシプロピルメチルジメトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン等が挙げられる。
表面に上記フェニルシラン化合物又は上記(メタ)アクリルシラン化合物に由来する基を有する無機充填剤と、表面に上記エポキシシラン化合物に由来する基を有する無機充填剤とを併用する場合には、表面に上記フェニルシラン化合物又は上記(メタ)アクリルシラン化合物に由来する基を有する無機充填剤100重量部に対する、表面に上記エポキシシラン化合物に由来する基を有する無機充填剤の配合量の好ましい下限が20重量部、好ましい上限が150重量部である。
上記チクソトロピー付与剤を含有することで、A1とA2/A1とを図1の実線及び破線で囲まれた範囲内に調整しやすくなり、ボイドの発生及び電子部品用接着剤の半導体チップ上面への這い上がりを、より良好に抑制することができる。
また、上記チクソトロピー付与剤は、必要に応じて、表面処理が施されていてもよい。上記表面処理が施されたチクソトロピー付与剤は特に限定されないが、表面に疎水基を有する粒子が好ましく、具体的には、例えば、表面を疎水化したヒュームドシリカ等が挙げられる。
上記希釈剤は、エポキシ基を有することが好ましく、1分子中のエポキシ基数の好ましい下限が2、好ましい上限が4である。1分子中のエポキシ基数が2未満であると、電子部品用接着剤の硬化後に充分な耐熱性が発現しないことがある。1分子中のエポキシ基数が4を超えると、硬化によるひずみが発生したり、未硬化のエポキシ基が残存したりすることがあり、これにより、接合強度の低下又は繰り返しの熱応力による接合不良が発生することがある。上記希釈剤の1分子中のエポキシ基数のより好ましい上限は3である。
また、上記希釈剤は、芳香環及び/又はジシクロペンタジエン構造を有することが好ましい。
また、上記希釈剤は、上記硬化性化合物よりも硬化開始温度が低く、硬化速度が大きいことが好ましい。
上記溶媒は特に限定されず、例えば、芳香族炭化水素類、塩化芳香族炭化水素類、塩化脂肪族炭化水素類、アルコール類、エステル類、エーテル類、ケトン類、グリコールエーテル(セロソルブ)類、脂環式炭化水素類、脂肪族炭化水素類等が挙げられる。
上記無機イオン交換体のうち、市販品として、例えば、IXEシリーズ(東亞合成社製)等が挙げられる。本発明の電子部品用接着剤が上記無機イオン交換体を含有する場合、上記無機イオン交換体の配合量は特に限定されないが、好ましい上限が10重量%、好ましい下限が1重量%である。
また、本発明の電子部品用接着剤は、必要に応じて、ブリード防止剤、イミダゾールシランカップリング剤等の接着性付与剤等のその他の添加剤を含有してもよい。
突起状電極を有する半導体チップをフリップチップ実装により基板に接合するとともに封止を行う半導体チップ実装体の製造方法であって、本発明の電子部品用接着剤を基板上に設ける工程と、前記電子部品用接着剤を介して、半導体チップの突起状電極と前記基板の電極部とを接触させるとともに前記電子部品用接着剤を封止領域に充填する工程と、前記半導体チップの突起状電極と前記基板の電極部とを接合するとともに接合部の前記電子部品用接着剤を硬化させる工程と、前記電子部品用接着剤を完全硬化させる工程とを有する半導体チップ実装体の製造方法もまた、本発明の1つである。
本発明の半導体チップ実装体の製造方法では、まず、本発明の電子部品用接着剤を基板上に設ける工程を行う。
上記工程では、上記半導体チップに対して押圧し、上記半導体チップの突起状電極と上記基板の電極部とを接触させるとともに電子部品用接着剤を封止領域に充填することが好ましい。上記押圧する際の圧力は特に限定されないが、突起状電極当たり0.1~10Nであることが好ましい。上記圧力が0.1N未満であると、上記半導体チップの突起状電極と上記基板の電極とが接触しないことがある。上記圧力が10Nを超えると、上記半導体チップの突起状電極がつぶれすぎて隣の突起状電極と接触し、ショートすることがある。
また、上記半導体チップの突起状電極と上記基板の電極部とを接触させるとともに電子部品用接着剤を封止領域に充填する際の温度及び時間は、本発明の効果を阻害しない範囲内であれば特に限定されず、例えば、120~220℃、1~30N、0.1~60秒等が挙げられる。上記半導体チップの突起状電極等がハンダである場合には、ハンダの溶融温度以下の温度で加熱すればよい。
上記半導体チップの突起状電極と上記基板の電極部とを接合するとともに接合部の電子部品用接着剤を硬化させる際の温度及び時間は、本発明の効果を阻害しない範囲内であれば特に限定されず、例えば、230~300℃、1~30N、0.1~60秒等が挙げられる。上記半導体チップの突起状電極等がハンダである場合には、ハンダの溶融温度以上の温度で加熱すればよい。
電子部品用接着剤を完全硬化させる際の硬化条件は特に限定されず、電子部品用接着剤の硬化特性に合わせた硬化条件を適宜選択して用いることができ、例えば、120℃で30分、170℃で30分等が挙げられる。
(1)電子部品用接着剤の製造
表1~4に示す組成に従って、ホモディスパーを用いて下記に示す各材料(重量部)を攪拌混合し、電子部品用接着剤を調製した。得られた電子部品用接着剤について、E型粘度測定装置(VISCOMETER TV-22、TOKAI SANGYO CO.LTD社製)を用いて25℃の設定温度にて回転数5rpmにおける粘度A1及び0.5rpmにおける粘度A2を測定した。A1、A2、及び、A2/A1を表1~4に示す。また、横軸をA1(Pa・s)、縦軸をA2/A1として、実施例1~33、比較例1~12及び14~20で得られたA1とA2/A1との関係をプロットしたグラフを図2に示す。なお、実施例を円形(白抜き)で、比較例を菱形(塗りつぶし)でプロットした。
また、得られた電子部品用接着剤について、170℃、30分間の条件で硬化させた後、TMA/SS6000(Seiko Instruments社製)を用い、引張りモードにて30~300℃(10℃昇温)伸縮を2サイクル行い、2サイクル目の曲線から、線膨張係数を求めた。
アニリン型エポキシ化合物(EP-3900S、アデカ社製)
ナフタレン型エポキシ化合物(EXA-4710、アデカ社製)
グリシジルアミン型エポキシ化合物(YH-434L、新日鐵化学社製)
ビスフェノールF型エポキシ化合物(EXA-830CRP、DIC社製)
ナフタレン型エピスルフィド化合物(フラスコ内に、ナフタレン型エポキシ(DIC社製HP-4032D、エポキシ当量=140g/eq.)を100g及びテトラヒドロフランを200g仕込み、室温にて攪拌してエポキシ化合物を溶解させた。溶解後、チオ尿素を100g及びメタノールを200g添加し、温度30~35℃で、攪拌しながら5時間反応を行った。反応終了後、メチルイソブチルケトンを300g添加した後、純水250gで5回水洗した。水洗後、ロータリーエバポレーターにて減圧下、温度90℃でメチルイソブチルケトンを留去して、無色透明液体のナフタレン型エピスルフィド化合物を101.2g得た。)
ビスマレイミド化合物(BMI-1000、大和化成工業社製)
酸無水物硬化剤(YH-307、JER社製)
酸無水物硬化剤(YH-306、JER社製)
フェノール硬化剤(MEH-8000H、明和化成社製)
イミダゾール化合物(2MA-OK、四国化成工業社製)
6-1.M値が20以下である無機充填剤(無機充填剤(1))
SE-2050(シリカフィラー、アドマテックス社製、平均粒子径0.5μm、最大粒子径3μm、表面処理なし、M値0)
SE-1050(シリカフィラー、アドマテックス社製、平均粒子径0.3μm、最大粒子径1μm、表面処理なし、M値0)
SE-4050(シリカフィラー、アドマテックス社製、平均粒子径1μm、最大粒子径5μm、表面処理なし、M値0)
SE-1050―SET(シリカフィラー、アドマテックス社製、平均粒子径0.3μm、最大粒子径1μm、エポキシシラン化合物に由来する基を有する無機充填剤、M値20)
MT-10(ヒュームドシリカ、トクヤマ社製、M値47)
SE-2050-STJ(シリカフィラー、アドマテックス社製、平均粒子径0.5μm、最大粒子径3μm、メチルシラン化合物に由来する基を有する無機充填剤、M値64)
SE-1050-STT(シリカフィラー、アドマテックス社製、平均粒子径0.3μm、最大粒子径1μm、メチルシラン化合物に由来する基を有する無機充填剤、M値64)
PM-20L(ヒュームドシリカ、トクヤマ社製、M値65)
SE-2050-SPJ(シリカフィラー、アドマテックス社製、平均粒子径0.5μm、最大粒子径3μm、フェニルシラン化合物に由来する基を有する無機充填剤、M値30)
SE-1050-SPT(シリカフィラー、アドマテックス社製、平均粒子径0.3μm、最大粒子径1μm、フェニルシラン化合物に由来する基を有する無機充填剤、M値30)
SE-1050-SMT(シリカフィラー、アドマテックス社製、平均粒子径0.3μm、最大粒子径1μm、メタクリルシラン化合物に由来する基を有する無機充填剤、M値40)
SE-2050-SMJ(シリカフィラー、アドマテックス社製、平均粒子径0.5μm、最大粒子径3μm、メタクリルシラン化合物に由来する基を有する無機充填剤、M値40)
7-1.SP値が13以上である官能基と、SP値が9以上13未満である官能基とを有する界面活性剤(界面活性剤(1))
BYK-W9010(シリコーン化合物、ビッグケミー・ジャパン社製、SP値が13.36のリン酸基と、SP値が9.71のポリエーテル基とを有する)
X-22-3939A(アミノ・ポリエーテル変性シリコーンオイル、信越化学工業社製、SP値が16.5の1級アミン基と、SP値が9.71のポリエーテル基とを有する)
KF-101(エポキシ変性シリコーンオイル、信越化学工業社製、SP値が12.04のエポキシ基と、SP値が7.40のジメチルシロキサン基とを有する)
X-22-4741(エポキシ・ポリエーテル変性シリコーンオイル、信越化学工業社製、SP値が12.04のエポキシ基と、SP値が7.55のジメチルシロキサン基とを有する)
得られた電子部品用接着剤を10mLシリンジ(岩下エンジニアリング社製)に充填し、シリンジ先端に精密ノズル(岩下エンジニアリング社製、ノズル先端径0.3mm)を取り付け、ディスペンサ装置(SHOT MASTER300、武蔵エンジニアリング社製)を用いて、吐出圧0.4MPa、基板とニードルとのギャップ200μm、塗布量3.3μLにて基板(WALTS-KIT MB50-0101JY、ウォルツ社製)上に塗布した。
実施例及び比較例で得られた半導体チップ実装体について、以下の評価を行った。結果を表1~4に示す。
基板への半導体チップの実装中及び実装後の電子部品用接着剤の流動を観察することにより、フリップチップボンダ(FC-3000S、東レエンジニアリング社製)のアタッチメントへの電子部品用接着剤の付着について、下記の基準で評価した。
○ 電子部品用接着剤が半導体チップの厚み以上に這い上がることがなく、アタッチメントに付着しなかった。
× 電子部品用接着剤が半導体チップの厚み以上に這い上がり、アタッチメントに付着した。
超音波探査映像装置(mi-scope hyper II、日立建機ファインテック社製)を用いて、得られた半導体チップ実装体のボイドを観察し、下記の基準で評価した。
○ ボイドがほとんど観察されなかった。
△ ボイドがわずかに観察された。
× ボイドによる目立った剥離が観察された。
上記の半導体チップ実装体の製造時と同じ条件で電子部品用接着剤を基板上に塗布した。この際、16個の基板に対して連続で塗布を行った際の描線を観察した。
○ 長さ10cmの描線10本を、基板内及び基板間で途切れることなく作製できた。
△ 長さ10cmの描線10本を、基板内及び基板間で途切れることなく作製できたが、線幅が50%以下になってしまった部分又は100%以上になってしまった部分があった。
× 基板内又は基板間で描線が途中で途切れてしまった(線幅が50%以下になってしまった部分又は100%以上になってしまった部分がある場合を含む)。
上記で作製した塗布後の電子部品用接着剤を80℃のホットプレート上に置き、接着剤形状の崩れを観察した。
○ 形状保持時間が1時間以上であった。
△ 形状保持時間が30分以上1時間未満であった。
× 形状保持時間が30分未満であった。
Claims (9)
- 硬化性化合物と、硬化剤と、無機充填剤とを含有する電子部品用接着剤であって、
25℃でE型粘度計を用いて測定した5rpmでの粘度をA1(Pa・s)、0.5rpmでの粘度をA2(Pa・s)としたとき、A1とA2/A1とが図1の実線及び破線で囲まれた範囲内(ただし、実線上は含むが破線上は含まない)であり、
前記硬化性化合物100重量部に対して、前記硬化剤の配合量が5~150重量部、前記無機充填剤の配合量が60~400重量部である
ことを特徴とする電子部品用接着剤。 - 更に、溶解度パラメータ(SP値)が13以上である官能基と、溶解度パラメータ(SP値)が9以上13未満である官能基とを有する界面活性剤を含有し、
無機充填剤は、疎水化度(M値)が20以下である
ことを特徴とする請求項1記載の電子部品用接着剤。 - 更に、溶解度パラメータ(SP値)が9未満である官能基と、溶解度パラメータ(SP値)が9以上13未満である官能基とを有する界面活性剤を含有し、
無機充填剤は、疎水化度(M値)が45以上である
ことを特徴とする請求項1記載の電子部品用接着剤。 - 無機充填剤は、平均粒子径が0.1~3μmであることを特徴とする請求項1、2又は3記載の電子部品用接着剤。
- 硬化後の40~80℃における線膨張係数が20~50ppm/℃であることを特徴とする請求項1、2、3又は4記載の電子部品用接着剤。
- 硬化性化合物は、エポキシ化合物、ビスマレイミド化合物、エピスルフィド化合物からなる群より選択される少なくとも1つの化合物を含有することを特徴とする請求項1、2、3、4又は5記載の電子部品用接着剤。
- 無機充填剤は、表面にフェニルシラン化合物又は(メタ)アクリルシラン化合物に由来する基を有する無機充填剤を含有することを特徴とする請求項1、2、3、4、5又は6記載の電子部品用接着剤。
- 無機充填剤は、更に、表面にエポキシシラン化合物に由来する基を有する無機充填剤を含有することを特徴とする請求項7記載の電子部品用接着剤。
- 突起状電極を有する半導体チップをフリップチップ実装により基板に接合するとともに封止を行う半導体チップ実装体の製造方法であって、
請求項1、2、3、4、5、6、7又は8記載の電子部品用接着剤を基板上に設ける工程と、
前記電子部品用接着剤を介して、半導体チップの突起状電極と前記基板の電極部とを接触させるとともに前記電子部品用接着剤を封止領域に充填する工程と、
前記半導体チップの突起状電極と前記基板の電極部とを接合するとともに接合部の前記電子部品用接着剤を硬化させる工程と、
前記電子部品用接着剤を完全硬化させる工程とを有する
ことを特徴とする半導体チップ実装体の製造方法。
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