WO2014156883A1 - 封止シート、半導体装置の製造方法及び封止シート付き基板 - Google Patents
封止シート、半導体装置の製造方法及び封止シート付き基板 Download PDFInfo
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- WO2014156883A1 WO2014156883A1 PCT/JP2014/057537 JP2014057537W WO2014156883A1 WO 2014156883 A1 WO2014156883 A1 WO 2014156883A1 JP 2014057537 W JP2014057537 W JP 2014057537W WO 2014156883 A1 WO2014156883 A1 WO 2014156883A1
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- underfill material
- sealing sheet
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- semiconductor element
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Definitions
- the present invention relates to a sealing sheet, a method for manufacturing a semiconductor device, and a substrate with a sealing sheet.
- sealing resin a liquid sealing resin is widely used.
- an adhesive layer (underfill sheet) is disposed on the substrate, and the space between the two is filled with the adhesive layer disposed on the substrate when the semiconductor element is connected to the substrate. It has been adopted. In this filling process, the space between the adherend and the semiconductor element can be easily filled.
- the adhesive layer as the underfill sheet is used in a single layer form, and the single-layer adhesive layer is directly arranged on the tape substrate. Handling is difficult, and adhesion to unintended locations or breakage of the adhesive layer may occur.
- a reinforcing material for reinforcing the underfill sheet can be bonded to cope with the sealing sheet. In this case, the workability of the underfill sheet before placement on the substrate is improved due to the presence of the reinforcing material, but since the reinforcing material is used in combination with the underfill sheet, it is used as a sealing sheet during placement. Requires new characteristics based on the combination.
- the present invention uses a sealing sheet that can suppress the generation of voids due to good embedding property in the unevenness of a semiconductor element or an adherend, and has good workability before and after being attached to an adherend. It is an object of the present invention to provide a method for manufacturing a semiconductor device and a substrate on which the sealing sheet is bonded.
- the sealing sheet of this invention is equipped with a base material and the underfill material which has the following characteristics provided on this base material.
- 90 ° peel strength from the substrate 1 mN / 20 mm or more and 50 mN / 20 mm or less Breaking elongation at 25 ° C .: 10% or more Minimum viscosity at 40 ° C. or more and less than 100 ° C .: 20000 Pa ⁇ s or less Minimum at 100 ° C. or more and 200 ° C. or less Viscosity: 100 Pa ⁇ s or more
- the underfill material After bonding the underfill material to an adherend such as a substrate, it is necessary to peel the base material from the underfill material.
- the 90 ° peeling force from the base material of the underfill material is 1 mN / 20 mm or more and 50 mN / 20 mm or less, it can be peeled smoothly without applying an excessive load.
- the breaking elongation at 25 ° C. of the underfill material is 10% or more, it does not break even if the stretching action is applied before being attached to the adherend. Even if a force is applied, the underfill material itself can be prevented from breaking.
- the minimum viscosity of the underfill material at 40 ° C. or more and less than 100 ° C.
- each measuring method of 90 degree peeling force, breaking elongation, minimum melt viscosity, and peeling force with respect to a base material is based on description of an Example.
- the underfill material preferably includes a thermoplastic resin and a thermosetting resin.
- the thermoplastic resin includes an acrylic resin and the thermosetting resin includes an epoxy resin and a phenol resin.
- the thermosetting resin includes a thermosetting resin that is liquid at 25 ° C. (hereinafter also referred to as “liquid thermosetting resin”), and the weight of the liquid thermosetting resin with respect to the total weight of the thermosetting resin. Is preferably 5% by weight or more and 40% by weight or less. This makes it possible to exhibit the above characteristics in a well-balanced manner, and in particular, it is easy to adjust the viscosity, and the underfill material can be embedded in the unevenness of the adherend.
- liquid thermosetting resin a thermosetting resin that is liquid at 25 ° C.
- the underfill material preferably contains a flux agent.
- the oxide film on the electrode surface such as the solder bump can be removed and the wettability of the solder can be improved, and the protruding electrode such as the solder bump provided on the semiconductor element can be efficiently melted so that the semiconductor element is covered with the semiconductor element.
- the electrical connection with the body can be made more reliable.
- the base material preferably contains a thermoplastic resin.
- the thermoplastic resin is preferably polyethylene terephthalate from the viewpoint of imparting appropriate tensile strength, mechanical properties such as elongation to the sealing sheet.
- a semiconductor device comprising an adherend, a semiconductor element electrically connected to the adherend, and an underfill material that fills a space between the adherend and the semiconductor element.
- a manufacturing method comprising: A preparation step of preparing the sealing sheet; A bonding step of bonding the underfill material of the sealing sheet to the adherend so as to cover a connection position with the semiconductor element on the adherend; A peeling step of peeling the base material from the underfill material bonded to the adherend; A connection step of electrically connecting the semiconductor element and the adherend via a protruding electrode formed on the semiconductor element while filling a space between the adherend and the semiconductor element with the underfill material.
- a method of manufacturing a semiconductor device including:
- the underfill material of the sealing sheet is bonded to the adherend, and then the semiconductor elements are electrically connected.
- the underfill material is not broken and the adhesion to the semiconductor element can be improved.
- the underfill material has a predetermined viscosity at the time of bonding, the followability to the unevenness of the adherend and the semiconductor element can also be improved.
- the present invention also includes a substrate with a sealing sheet including a substrate and the sealing sheet attached to the substrate.
- the sealing sheet of this invention is equipped with a base material and the underfill material which has the following characteristics provided on this base material.
- 90 ° peel strength from the substrate 1 mN / 20 mm or more and 50 mN / 20 mm or less Breaking elongation at 25 ° C .: 10% or more Minimum viscosity at 40 ° C. or more and less than 100 ° C .: 20000 Pa ⁇ s or less Minimum at 100 ° C. or more and 200 ° C. or less Viscosity: 100 Pa ⁇ s or more
- the present invention also includes a semiconductor comprising an adherend, a semiconductor element electrically connected to the adherend, and an underfill material that fills a space between the adherend and the semiconductor element.
- a device manufacturing method comprising: A preparation step of preparing the sealing sheet; A bonding step of bonding the underfill material of the sealing sheet to the adherend so as to cover a connection position with the semiconductor element on the adherend; A peeling step of peeling the base material from the underfill material bonded to the adherend; A connection step of electrically connecting the semiconductor element and the adherend via a protruding electrode formed on the semiconductor element while filling a space between the adherend and the semiconductor element with the underfill material.
- a method of manufacturing a semiconductor device including:
- the sealing sheet 10 is prepared (see FIG. 1).
- the sealing sheet 10 includes a base material 1 and an underfill material 2 provided on the base material 1 and having the following characteristics.
- 90 ° peel strength from the substrate 1 mN / 20 mm or more and 50 mN / 20 mm or less Breaking elongation at 25 ° C .: 10% or more Minimum viscosity at 40 ° C. or more and less than 100 ° C .: 20000 Pa ⁇ s or less Minimum at 100 ° C. or more and 200 ° C. or less Viscosity: 100 Pa ⁇ s or more
- the substrate 1 is a strength matrix of the sealing sheet 10.
- polyolefins such as low density polyethylene, linear polyethylene, medium density polyethylene, high density polyethylene, ultra low density polyethylene, random copolymer polypropylene, block copolymer polypropylene, homopolypropylene, polybutene, polymethylpentene, ethylene-acetic acid Vinyl copolymer, ionomer resin, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester (random, alternating) copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, Polyester such as polyurethane, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyetheretherketone, polyimide, polyetherimide, polyamide, wholly aromatic polyamide, polyphenylsulfur De, aramid (paper), glass, glass cloth, fluorine resin, polyvinylene, polyviny
- examples of the material of the substrate 1 include polymers such as a crosslinked body of the above resin.
- the plastic film may be used unstretched or may be uniaxially or biaxially stretched as necessary.
- the surface of the substrate 1 is chemically treated by conventional surface treatments such as chromic acid treatment, ozone exposure, flame exposure, high piezoelectric impact exposure, ionizing radiation treatment, etc. in order to improve adhesion and retention with adjacent layers.
- a physical treatment or a coating treatment with a primer for example, an adhesive substance described later can be performed.
- the base material 1 can be used by appropriately selecting the same kind or different kinds, and a blend of several kinds can be used as necessary.
- the base material 1 is provided with a vapor-deposited layer of a conductive material having a thickness of about 30 to 500 mm made of a metal, an alloy, an oxide thereof, or the like on the base material 1 in order to impart an antistatic ability. be able to.
- the substrate 1 may be a single layer or two or more layers.
- the thickness of the substrate 1 can be appropriately determined in consideration of the workability of the sealing sheet 10 and the like, and is generally about 5 ⁇ m to 200 ⁇ m, preferably 35 ⁇ m to 120 ⁇ m.
- additives for example, a colorant, a filler, a plasticizer, an anti-aging agent, an antioxidant, a surfactant, a flame retardant, etc.
- a colorant for example, a colorant, a filler, a plasticizer, an anti-aging agent, an antioxidant, a surfactant, a flame retardant, etc.
- the underfill material 2 in the present embodiment can be used as a sealing film that fills the space between the surface-mounted semiconductor element 5 and the adherend 6 (see FIG. 2C).
- the 90 ° peeling force from the base material 1 of the underfill material 2 is 1 mN / 20 mm or more and 50 mN / 20 mm or less.
- the lower limit of the 90 ° peeling force is not particularly limited as long as it is 1 mN / 20 mm or more, but is preferably 5 mN / 20 mm or more, and more preferably 10 mN / 20 mm or more.
- the upper limit of the 90 ° peeling force is not particularly limited as long as it is 50 mN / 20 mm or less, but is preferably 40 mN / 20 mm or less, and more preferably 30 mN / 20 mm or less.
- the base sheet 1 is peeled off from the underfill material 2 to the sealing sheet 10. It can be peeled off smoothly without applying an excessive load (see FIG. 2B), and it is possible to prevent inadvertent peeling between the underfill material and the base material when the sealing sheet is handled. .
- the breaking elongation at 25 ° C. of the underfill material 2 is 10% or more, preferably 50% or more, more preferably 100% or more.
- the underfill material 2 is not broken even if the expansion / contraction action is applied before being attached to the adherend when the sealing sheet 10 is handled. In addition, even if the above peeling force is applied during peeling, the underfill is not broken. Breakage of the material 2 itself can be prevented.
- the upper limit of the said breaking elongation is so preferable that it is high, about 1000% is a limit physically.
- the viscosity of the underfill material 2 at 40 ° C. or more and less than 100 ° C. is 20000 Pa ⁇ s or less, preferably 15000 Pa ⁇ s or less, more preferably 10,000 Pa ⁇ s or less. With such a viscosity, the embedding property of the underfill material 2 into the unevenness of the adherend 6 is good, and generation of voids between the underfill material 2 and the adherend 6 can be prevented.
- the minimum of the said viscosity is not specifically limited, From a viewpoint of the shape maintenance property at the time of bonding to adherends, such as a board
- the minimum viscosity of the underfill material 2 at 100 ° C. or more and 200 ° C. or less is 100 Pa ⁇ s or more, preferably 500 Pa ⁇ s or more, more preferably 1000 Pa ⁇ s or more.
- the upper limit of the said minimum viscosity is not specifically limited, From a viewpoint of the embedding property with respect to the unevenness
- thermoplastic resin As a constituent material of the underfill material, a combination of a thermoplastic resin and a thermosetting resin can be used. A thermoplastic resin or a thermosetting resin alone can also be used.
- thermoplastic resin examples include natural rubber, butyl rubber, isoprene rubber, chloroprene rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, polybutadiene resin, polycarbonate resin, heat Examples thereof include plastic polyimide resins, polyamide resins such as 6-nylon and 6,6-nylon, phenoxy resins, acrylic resins, saturated polyester resins such as PET and PBT, polyamideimide resins, and fluorine resins. These thermoplastic resins can be used alone or in combination of two or more. Of these thermoplastic resins, an acrylic resin that has few ionic impurities and high heat resistance and can ensure the reliability of the semiconductor element is particularly preferable.
- the acrylic resin is not particularly limited, and includes one or more esters of acrylic acid or methacrylic acid ester having a linear or branched alkyl group having 30 or less carbon atoms, particularly 4 to 18 carbon atoms.
- Examples include polymers as components.
- the alkyl group include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, t-butyl group, isobutyl group, amyl group, isoamyl group, hexyl group, heptyl group, cyclohexyl group, 2 -Ethylhexyl group, octyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, undecyl group, lauryl group, tridecyl group, tetradecyl group, stearyl group, octadecyl group,
- the other monomer forming the polymer is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid.
- Carboxyl group-containing monomers maleic anhydride or acid anhydride monomers such as itaconic anhydride, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-methacrylic acid 4- Hydroxybutyl, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate or (4-hydroxymethylcyclohexyl) -Methyl Hydroxyl group-containing monomers such as acrylate, styrene sulfonic acid, allyl sulfonic acid, 2- (meth) acrylamide-2-methylpropane sulfonic acid, (meth) acrylamide propane sulfonic acid, sulfopropyl (meth) acrylate or (meth) Examples thereof include sulfonic acid group-containing monomers such as
- thermosetting resin examples include phenol resin, amino resin, unsaturated polyester resin, epoxy resin, polyurethane resin, silicone resin, and thermosetting polyimide resin. These resins can be used alone or in combination of two or more. In particular, an epoxy resin containing a small amount of ionic impurities or the like that corrode semiconductor elements is preferable. Moreover, as a hardening
- the epoxy resin is not particularly limited as long as it is generally used as an adhesive composition, for example, bisphenol A type, bisphenol F type, bisphenol S type, brominated bisphenol A type, hydrogenated bisphenol A type, bisphenol AF type.
- novolac type epoxy resins novolac type epoxy resins, biphenyl type epoxy resins, trishydroxyphenylmethane type resins or tetraphenylolethane type epoxy resins are particularly preferred. This is because these epoxy resins are rich in reactivity with a phenol resin as a curing agent and are excellent in heat resistance and the like.
- the phenol resin acts as a curing agent for the epoxy resin, for example, a novolac type phenol resin such as a phenol novolac resin, a phenol aralkyl resin, a cresol novolac resin, a tert-butylphenol novolac resin, a nonylphenol novolac resin, Examples include resol-type phenolic resins and polyoxystyrenes such as polyparaoxystyrene. These can be used alone or in combination of two or more. Of these phenol resins, phenol novolac resins and phenol aralkyl resins are particularly preferred. This is because the connection reliability of the semiconductor device can be improved.
- the compounding ratio of the epoxy resin and the phenol resin is preferably such that, for example, the hydroxyl group in the phenol resin is 0.5 to 2.0 equivalents per equivalent of the epoxy group in the epoxy resin component. More preferred is 0.8 to 1.2 equivalents. That is, if the blending ratio of both is out of the above range, sufficient curing reaction does not proceed and the properties of the cured epoxy resin are likely to deteriorate.
- an underfill material using an epoxy resin, a phenol resin, and an acrylic resin is particularly preferable. Since these resins have few ionic impurities and high heat resistance, the reliability of the semiconductor element can be ensured.
- the mixing ratio of the epoxy resin and the phenol resin is 10 to 200 parts by weight with respect to 100 parts by weight of the acrylic resin component.
- the thermosetting resin preferably includes a liquid thermosetting resin.
- the ratio of the weight of the liquid thermosetting resin to the total weight of the thermosetting resin is preferably 5% by weight to 40% by weight, and more preferably 10% by weight to 35% by weight.
- the required characteristics of the underfill material 2 can be exhibited in a well-balanced manner, and in particular, the embedding property of the underfill material 2 into the unevenness of the adherend 6 can be improved.
- the liquid thermosetting resin those having a weight average molecular weight of 1000 or less among the above-mentioned thermosetting resins can be suitably used.
- the measuring method of a weight average molecular weight can be measured with the following method.
- a sample is dissolved in THF at 0.1 wt%, and the weight average molecular weight is measured by polystyrene conversion using GPC (gel permeation chromatography).
- GPC gel permeation chromatography
- Detailed measurement conditions are as follows. ⁇ Measurement conditions of weight average molecular weight> GPC equipment: Tosoh HLC-8120GPC Column: manufactured by Tosoh Corporation, (GMHHR-H) + (GMHHR-H) + (G2000HHR) Flow rate: 0.8mL / min Concentration: 0.1 wt% Injection volume: 100 ⁇ L Column temperature: 40 ° C Eluent: THF
- thermosetting acceleration catalyst for epoxy resin and phenol resin is not particularly limited, and can be appropriately selected from known thermosetting acceleration catalysts.
- stimulation catalyst can be used individually or in combination of 2 or more types.
- thermosetting acceleration catalyst for example, an amine-based curing accelerator, a phosphorus-based curing accelerator, an imidazole-based curing accelerator, a boron-based curing accelerator, a phosphorus-boron-based curing accelerator, or the like can be used.
- the underfill material 2 may be added with a flux in order to remove the oxide film on the surface of the solder bump and facilitate mounting of the semiconductor element.
- a flux the compound which has a conventionally well-known flux effect
- production of carboxylate ion can be suppressed and the reactivity with the thermosetting resin etc. which have reactive functional groups, such as an epoxy group, can be suppressed.
- the carboxyl group-containing compound does not immediately react with the thermosetting resin even by heat at the time of mounting the semiconductor, and can sufficiently exhibit the flux function by the heat applied over time thereafter.
- the carboxyl group-containing compound according to this embodiment is not particularly limited as long as it is a compound having at least one carboxyl group in the molecule and having an acid dissociation constant pKa of 3.5 or more and having a flux function.
- the pKa of the carboxyl group-containing compound may be 3.5 or more, but from the viewpoints of suppressing the reaction with the epoxy resin and exhibiting the stability of the flexibility over time and the flux function, it is 3.5 or more and 7.0. The following is preferable, and 4.0 or more and 6.0 or less are more preferable.
- the carboxyl group has two or more is an acid dissociation constant of the first dissociation constant pKa 1, which the first dissociation constant pKa 1 is in the above range is preferred.
- BH represents a carboxyl group-containing compound
- B ⁇ represents a conjugate base of the carboxyl group-containing compound.
- the measuring method of pKa can be calculated from the concentration of the relevant substance and the hydrogen ion concentration by measuring the hydrogen ion concentration using a pH meter.
- carboxyl group-containing compound examples include an aromatic carboxylic acid having at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, an aryloxy group, an aryl group, and an alkylamino group (hereinafter simply referred to as “carboxyl group-containing compound”).
- carboxyl group-containing compound an aromatic carboxylic acid having at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, an aryloxy group, an aryl group, and an alkylamino group
- carboxyl group-containing compound examples include an aromatic carboxylic acid having at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, an aryloxy group, an aryl group, and an alkylamino group (hereinafter simply referred to as “carboxyl group-containing compound”).
- aliphatic carboxylic acid having one or more carboxyl groups in the molecule and having 8 or more carbon atoms
- the aromatic carboxylic acid is not particularly limited as long as it has at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, an aryloxy group, an aryl group, and an alkylamino group in the molecule.
- the parent skeleton excluding the above substituent of the aromatic carboxylic acid is not particularly limited, and examples thereof include benzoic acid and naphthalene carboxylic acid.
- Aromatic carboxylic acids have the above substituents on the aromatic rings of these parent skeletons. Among these, benzoic acid is preferable as the base skeleton of the aromatic carboxylic acid from the viewpoint of stability in the sheet-like sealing composition and low reactivity with the epoxy resin.
- At least one hydrogen atom in the 2-position, 4-position and 6-position is independently substituted with an alkyl group, an alkoxy group, an aryloxy group, an aryl group or an alkylamino group.
- It is preferably a benzoic acid derivative (hereinafter sometimes simply referred to as “benzoic acid derivative”).
- the predetermined substituent is present alone or in combination at at least one of the 2-position, 4-position and 6-position of benzoic acid.
- Specific examples of the substitution position of the substituent of the benzoic acid derivative include 2-position, 4-position, 2-position and 4-position, 2-position and 6-position, 2-position, 4-position and 6-position.
- it has a substituent at the 2-position or 4-position. Is preferred.
- alkyl group in the aromatic carboxylic acid examples include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n
- alkyl groups having 1 to 10 carbon atoms such as -pentyl group, n-hexyl group, n-heptyl group and n-octyl group.
- a methyl group or an ethyl group is preferable from the viewpoint of pKa adjustment and flux function expression.
- Examples of the alkoxy group include a methoxy group, an ethoxy group, an n-propoxy group, an n-butoxy group, an n-hexanoxy group, an i-propoxy group, an n-butoxy group, a 2-methylpropoxy group, and a t-butoxy group.
- Examples of the alkoxy group include 1 to 10 carbon atoms. Among these, from the same points as described above, an alkoxy group having 1 to 4 carbon atoms is preferable, a methoxy group and an ethoxy group are more preferable, and a methoxy group is particularly preferable.
- aryloxy group examples include a phenoxy group and a p-tolyloxy group, and a phenoxy group is preferable from the same viewpoint as described above.
- aryl group examples include aryl groups having 6 to 20 carbon atoms such as a phenyl group, toluyl group, benzyl group, methylbenzyl group, xylyl group, mesityl group, naphthyl group, and anthryl group.
- a phenyl group is preferred.
- alkylamino group an amino group having an alkyl group having 1 to 10 carbon atoms as a substituent can be suitably used.
- the alkylamino group include a methylamino group, an ethylamino group, a propylamino group, a dimethylamino group, a diethylamino group, a dipropylamino group, and the like. From the same viewpoint as described above, a dimethylamino group is preferable.
- one or more hydrogen atoms may be independently substituted.
- additional substituent include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, a 2-methylpropoxy group, a 1-methylpropoxy group, and a t-butoxy group.
- C1-C4 alkoxy group cyano group, cyanomethyl group, 2-cyanoethyl group, 3-cyanopropyl group, 4-cyanobutyl group and other C2-C5 cyanoalkyl groups, methoxycarbonyl group, ethoxycarbonyl group , Alkoxycarbonyl groups having 2 to 5 carbon atoms such as t-butoxycarbonyl group, alkoxycarbonylalkoxy groups having 3 to 6 carbon atoms such as methoxycarbonylmethoxy group, ethoxycarbonylmethoxy group, and t-butoxycarbonylmethoxy group, fluorine, chlorine Halogen atoms such as, fluoromethyl group, trifluoromethyl group, pentafur Fluoroalkyl groups such as Roechiru group.
- benzoic acid derivative having a specific combination of substitution position and substituent 2-aryloxybenzoic acid, 2-arylbenzoic acid, 4-alkoxybenzoic acid, and 4-alkylaminobenzoic acid are preferable.
- the benzoic acid derivative does not contain a hydroxyl group.
- the underfill material 2 can maintain its flexibility over time and can suitably exhibit a flux function. .
- the aliphatic carboxylic acid is not particularly limited, and may be any of a chain aliphatic (mono) carboxylic acid, an alicyclic (mono) carboxylic acid, a chain aliphatic polyvalent carboxylic acid, or an alicyclic polyvalent carboxylic acid. It may be. Moreover, you may use combining each aspect.
- chain aliphatic (mono) carboxylic acids examples include octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, and the like, oleic acid, elaidic acid, erucic acid, Examples thereof include unsaturated fatty acids such as nervonic acid, linolenic acid, stearidonic acid, eicosapentaenoic acid, linoleic acid and linolenic acid.
- alicyclic (mono) carboxylic acids examples include monocyclic carboxylic acids such as cycloheptanecarboxylic acid and cyclooctanecarboxylic acid, norbornanecarboxylic acid, tricyclodecanecarboxylic acid, tetracyclododecanecarboxylic acid, adamantanecarboxylic acid, and methyladamantane.
- monocyclic carboxylic acids such as cycloheptanecarboxylic acid and cyclooctanecarboxylic acid, norbornanecarboxylic acid, tricyclodecanecarboxylic acid, tetracyclododecanecarboxylic acid, adamantanecarboxylic acid, and methyladamantane.
- Examples thereof include polycyclic or bridged alicyclic carboxylic acids having 8 to 20 carbon atoms such as carboxylic acid, ethyladamantanecarboxy
- Examples of the chain aliphatic polyvalent carboxylic acid include carboxylic acids in which one or more carboxyl groups are further added to the chain aliphatic (mono) carboxylic acid.
- the chain aliphatic dicarboxylic acid is an epoxy resin. Is preferable in that the flux function is suitably exhibited.
- Examples of the chain aliphatic dicarboxylic acid include octanedioic acid, nonanedioic acid, decanedioic acid, dodecanedioic acid, tetradecanedioic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid, etc. Is preferably a chain aliphatic dicarboxylic acid having a molecular weight of 8 to 12.
- Examples of the alicyclic polyvalent carboxylic acid include carboxylic acids in which one or more carboxyl groups are further added to the alicyclic (mono) carboxylic acid. Among these, alicyclic dicarboxylic acids are less reactive to epoxy resins. In view of the properties and the flux function expression.
- Examples of the alicyclic dicarboxylic acids include polycyclic or bridged alicyclic dicarboxylic acids such as monocyclic dicarboxylic acids such as cyclohexane dicarboxylic acid, cycloheptane dicarboxylic acid, and cyclooctane dicarboxylic acid, norbornane dicarboxylic acid, and adamantane dicarboxylic acid. Etc.
- one or more hydrogen atoms may be substituted with the above additional substituent.
- the addition amount of the carboxyl group-containing compound as the fluxing agent may be such that the flux function is exerted, and is preferably 0.1 to 20% by weight with respect to the total weight of the organic resin components in the underfill material 2, 0.5 to 10% by weight is more preferable.
- the underfill material 2 may be colored as necessary.
- the color exhibited by coloring is not particularly limited. For example, black, blue, red, green, and the like are preferable. In coloring, it can be appropriately selected from known colorants such as pigments and dyes.
- an inorganic filler can be appropriately blended in the underfill material 2.
- the blending of the inorganic filler makes it possible to impart conductivity, improve thermal conductivity, adjust the storage elastic modulus, and the like.
- the inorganic filler examples include silica, clay, gypsum, calcium carbonate, barium sulfate, alumina oxide, beryllium oxide, silicon carbide, silicon nitride and other ceramics, aluminum, copper, silver, gold, nickel, chromium, lead And various inorganic powders made of metals such as tin, zinc, palladium, solder, or alloys, and other carbons. These can be used alone or in combination of two or more. Among these, silica, particularly fused silica is preferably used.
- the average particle size of the inorganic filler is not particularly limited, but is preferably in the range of 0.005 to 10 ⁇ m, more preferably in the range of 0.01 to 5 ⁇ m, and still more preferably 0.05 to 2 0.0 ⁇ m.
- the average particle size of the inorganic filler is less than 0.005 ⁇ m, the flexibility of the underfill material is reduced.
- the average particle size exceeds 10 ⁇ m, the particle size is large with respect to the gap sealed by the underfill material, which causes a decrease in sealing performance.
- inorganic fillers having different average particle sizes may be used in combination.
- the average particle size is a value determined by a photometric particle size distribution meter (manufactured by HORIBA, apparatus name: LA-910).
- the blending amount of the inorganic filler is preferably 10 to 400 parts by weight, more preferably 50 to 250 parts by weight with respect to 100 parts by weight of the organic resin component of the underfill material. If the blending amount of the inorganic filler is less than 10 parts by weight, the storage elastic modulus may be lowered and the stress reliability of the package may be greatly impaired. On the other hand, if it exceeds 400 parts by weight, the fluidity of the underfill material 2 may be reduced, and may not be sufficiently embedded in the irregularities of the substrate or semiconductor element, causing voids or cracks.
- additives can be appropriately added to the underfill material 2 as necessary.
- other additives include flame retardants, silane coupling agents, ion trapping agents, and the like.
- flame retardant include antimony trioxide, antimony pentoxide, brominated epoxy resin, and the like. These can be used alone or in combination of two or more.
- silane coupling agent include ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane, and the like. These compounds can be used alone or in combination of two or more.
- the ion trapping agent include hydrotalcites and bismuth hydroxide. These can be used alone or in combination of two or more.
- the water absorption rate under the conditions of a temperature of 23 ° C. and a humidity of 70% of the underfill material 2 before thermosetting is preferably 1% by weight or less, and more preferably 0.5% by weight or less.
- the lower limit of the water absorption rate is preferably as small as possible, substantially 0% by weight is preferable, and 0% by weight is more preferable.
- the thickness of the underfill material 2 (total thickness in the case of multiple layers) is not particularly limited, considering the strength of the underfill material 2 and the filling property of the space between the semiconductor element 5 and the adherend 6, it is 10 ⁇ m or more. It may be about 100 ⁇ m or less. Note that the thickness of the underfill material 2 may be appropriately set in consideration of the gap between the semiconductor element 5 and the adherend 6 and the height of the protruding electrode.
- the underfill material 2 of the sealing sheet 10 is preferably protected by a separator (not shown).
- the separator has a function as a protective material that protects the underfill material 2 until it is practically used.
- the separator is peeled off when the underfill material 2 of the sealing sheet is attached to the adherend 6.
- a plastic film or paper surface-coated with a release agent such as polyethylene terephthalate (PET), polyethylene, polypropylene, a fluorine release agent, or a long-chain alkyl acrylate release agent can be used.
- the base material 1 can be formed by a conventionally known film forming method.
- the film forming method include a calendar film forming method, a casting method in an organic solvent, an inflation extrusion method in a closed system, a T-die extrusion method, a co-extrusion method, and a dry lamination method.
- the underfill material 2 is produced as follows, for example. First, an adhesive composition that is a material for forming the underfill material 2 is prepared. As described in the section of the underfill material, the adhesive composition contains a thermoplastic component, a thermosetting resin, various additives, and the like.
- the coating film is dried under a predetermined condition to form an underfill material.
- a coating method For example, roll coating, screen coating, gravure coating, etc. are mentioned.
- drying conditions for example, a drying temperature of 70 to 160 ° C. and a drying time of 1 to 5 minutes are performed.
- an underfill material may be formed by drying a coating film on the said drying conditions. Then, an underfill material is bonded together with a separator on a base material separator.
- the separator is peeled off from the underfill material 2 and the underfill material and the base material are bonded together.
- Bonding can be performed by, for example, pressure bonding.
- the laminating temperature is not particularly limited, and is preferably 30 to 100 ° C., for example, and more preferably 40 to 80 ° C.
- the linear pressure is not particularly limited, and for example, 0.98 to 196 N / cm is preferable, and 9.8 to 98 N / cm is more preferable.
- the base material separator on the underfill material is peeled off, and the sealing sheet according to this embodiment is obtained.
- the underfill material 2 of the sealing sheet is bonded to the adherend 6 so as to cover the connection position with the semiconductor element on the adherend 6 (see FIG. 2A).
- the separator arbitrarily provided on the underfill material 2 of the sealing sheet 10 is appropriately peeled, the circuit surface on which the conductive material 7 of the adherend 6 is formed and the underfill material 2 are opposed to each other, The underfill material 2 and the adherend 6 are bonded together by pressure bonding.
- the adherend 6 various substrates such as a lead frame and a circuit substrate (such as a wiring circuit substrate), and other semiconductor elements can be used.
- the material of the substrate is not particularly limited, and examples thereof include a ceramic substrate and a plastic substrate.
- the plastic substrate include an epoxy substrate, a bismaleimide triazine substrate, a polyimide substrate, and a glass epoxy substrate.
- thermocompression bonding can usually be performed by a known pressing means such as a pressure bonding roll.
- the pressing condition may be 0.2 MPa or more, preferably 0.2 MPa or more and 1 MPa or less, more preferably 0.4 Pa or more and 0.8 Pa or less.
- thermocompression bonding temperature what is necessary is just 40 degreeC or more, Preferably it is 40 degreeC or more and 120 degrees C or less, More preferably, they are 60 degreeC or more and 100 degrees C or less.
- the pressure bonding may be performed under reduced pressure.
- the decompression condition may be 10,000 Pa or less, preferably 5000 Pa or less, more preferably 1000 Pa or less.
- the minimum of pressure reduction conditions is not specifically limited, What is necessary is just 10 Pa or more from the point of productivity.
- the substrate 20 with the sealing sheet in which the sealing sheet 10 is bonded to the adherend 6 is obtained at the stage where this bonding step is completed.
- the substrate 20 with the sealing sheet since the base material 1 functions as a protective material for the underfill material 2, the substrate 20 with the sealing sheet is made to stand by as an intermediate product for manufacturing a semiconductor device, for example, for production adjustment. It is possible to keep.
- the base material 1 is peeled from the underfill material 2 bonded to the adherend 6 (see FIG. 2B).
- the substrate 1 may be peeled off by hand or mechanically.
- the underfill material 2 is not broken or deformed, and the underfill material 2 is not peeled off from the adherend 6.
- the base material 1 can be peeled smoothly.
- connection process In the connecting step, the space between the adherend 6 and the semiconductor element 5 is filled with the underfill material 2 while the semiconductor element 5 and the adherend are interposed via the protruding electrodes 4 formed on the semiconductor element 5.
- the body 6 is electrically connected (see FIG. 2C).
- a plurality of protruding electrodes 4 may be formed on one circuit surface (see FIG. 2C), or protruding electrodes may be formed on both circuit surfaces of the semiconductor element 5 (not shown).
- the material of the bump electrode or conductive material such as a conductive material.
- a tin-lead metal material, a tin-silver metal material, a tin-silver-copper metal material, a tin-zinc metal material examples thereof include solders (alloys) such as a tin-zinc-bismuth metal material, a gold metal material, and a copper metal material.
- the height of the protruding electrode is also determined according to the application, and is generally about 15 to 100 ⁇ m. Of course, the height of each protruding electrode in the semiconductor element 5 may be the same or different.
- the projecting electrodes When projecting electrodes are formed on both surfaces of the semiconductor element, the projecting electrodes may or may not be electrically connected to each other. Examples of the electrical connection between the protruding electrodes include a connection through a via called a TSV (Through Silicon Via) format.
- TSV Through Silicon Via
- the semiconductor element 5 can be produced by a known method. Typically, a semiconductor wafer on which a predetermined circuit and protruding electrodes are formed is diced into individual pieces, and each semiconductor is picked up to pick up each semiconductor. An element can be obtained.
- the thickness of the underfill material includes the height X ( ⁇ m) of the protruding electrode formed on the surface of the semiconductor element and the thickness Y ( ⁇ m) of the underfill material.
- the space between the semiconductor element and the adherend can be sufficiently filled.
- excessive protrusion of the underfill material from the space can be prevented, and contamination of the semiconductor element by the underfill material can be prevented.
- the height of each protruding electrode is different, the height of the highest protruding electrode is used as a reference.
- the semiconductor element 5 As a procedure of electrical connection between the semiconductor element 5 and the adherend 6, the semiconductor element 5 is fixed to the adherend 6 according to a conventional method with the circuit surface of the semiconductor element 5 facing the adherend 6. .
- bumps (projection electrodes) 4 formed on the semiconductor element 5 are brought into contact with a bonding conductive material 7 (solder or the like) attached to the connection pad of the adherend 6 while pressing the conductive material.
- the electrical connection between the semiconductor element 5 and the adherend 6 can be secured, and the semiconductor element 5 can be fixed to the adherend 6. Since the underfill material 2 is affixed to the circuit surface of the adherend 6, the space between the semiconductor element 5 and the adherend 6 as well as the electrical connection between the semiconductor element 5 and the adherend 6. Is filled with the underfill material 2.
- the heating condition in the connecting step is 100 to 300 ° C.
- the pressurizing condition is 0.5 to 500 N.
- the resin between the bump electrode and the pad can be efficiently removed, and a better metal-to-metal bond can be obtained.
- connection step one or both of the protruding electrode and the conductive material are melted to connect the bump 4 on the circuit surface of the semiconductor element 5 and the conductive material 7 on the surface of the adherend 6.
- the temperature at the time of melting the bump 4 and the conductive material 7 is usually about 260 ° C. (for example, 250 ° C. to 300 ° C.).
- the sealing sheet according to the present embodiment can have heat resistance that can withstand high temperatures in this connection step by forming the underfill material 2 with an epoxy resin or the like.
- the semiconductor device 30 in which the semiconductor element 5 is mounted on the adherend 6 can be manufactured. Since the underfill material having the above predetermined characteristics is used for manufacturing the semiconductor device 30, it is possible to prevent the generation of voids between the adherend and the underfill material and between the underfill material and the semiconductor element. Thus, a highly reliable semiconductor device can be obtained.
- the underfill material 2 is uncured by the heat treatment in the connecting step, the underfill material 2 is cured by heating. Thereby, while being able to protect the circuit surface of the semiconductor element 5, the connection reliability between the semiconductor element 5 and the to-be-adhered body 6 can be ensured.
- the heating condition is not particularly limited, and it may be heated at about 150 to 200 ° C. for 10 to 120 minutes.
- fever applied at the said connection process this process can be abbreviate
- a sealing process may be performed to protect the entire semiconductor device 30 including the mounted semiconductor element 5.
- the sealing step is performed using a sealing resin.
- the sealing conditions at this time are not particularly limited.
- the sealing resin is thermally cured by heating at 175 ° C. for 60 seconds to 90 seconds, but the present invention is not limited to this. For example, it can be cured at 165 ° C. to 185 ° C. for several minutes.
- the sealing resin is not particularly limited as long as it is an insulating resin (insulating resin), and can be appropriately selected from sealing materials such as known sealing resins. Is more preferable.
- sealing resin the resin composition containing an epoxy resin etc. are mentioned, for example.
- the epoxy resin include the epoxy resins exemplified above.
- a thermosetting resin other than an epoxy resin such as a phenol resin
- a thermoplastic resin may be included as a resin component. Good.
- a phenol resin it can utilize also as a hardening
- the semiconductor element 5 and the adherend 6 are disposed via the bump (projection electrode) 4 formed on the semiconductor element 5 and the conductive material 7 provided on the adherend 6. Are electrically connected.
- An underfill material 2 is disposed between the semiconductor element 5 and the adherend 6 so as to fill the space. Since the semiconductor device 30 is obtained by the above manufacturing method using the sealing sheet 10, generation of voids is suppressed between the semiconductor element 5 and the underfill material 2. Therefore, the surface protection of the semiconductor element 5 and the filling of the space between the semiconductor element 5 and the adherend 6 are at a sufficient level, and the semiconductor device 30 can exhibit high reliability.
- Epoxy resin 1 (liquid at 25 ° C.): Trade name “Epicoat 828”, manufactured by JER Corporation Epoxy resin 2: Trade name “Epicoat 1004”, manufactured by JER Corporation Phenolic resin 1: Trade name “Millex XLC-4L” Mitsui Chemicals Phenol resin 2 (Liquid at 25 ° C): Trade name “MEH-8005”, Meiwa Kasei Co., Ltd.
- Elastomer 1 Acrylic ester polymer based on ethyl acrylate-methyl methacrylate (trade name “Paraklon”) W-197CM ", manufactured by Negami Kogyo Co., Ltd.
- Elastomer 2 Acrylic ester polymer based on butyl acrylate-acrylonitrile (trade name “SG-P3”, manufactured by Nagase Chemtex Co., Ltd.)
- Filler Spherical silica (trade name “SO-25R”, manufactured by Admatechs Inc.)
- Organic acid “2-phenylbenzoic acid” (manufactured by Tokyo Chemical Industry Co., Ltd.)
- Curing agent imidazole catalyst (trade name “2MA-OK”, manufactured by Shikoku Kasei Co., Ltd.)
- the peeling force (mN / 20 mm) when peeling the underfill material from the substrate was measured. Specifically, the sealing sheet was cut into a length of 100 mm and a width of 20 mm to obtain a test piece. The test piece was set in a tensile tester (trade name “Autograph AGS-H”, manufactured by Shimadzu Corporation), temperature 25 ⁇ 2 ° C., peel angle 90 °, peel speed 300 mm / min, and chuck distance 100 mm. Under the conditions, a T-type peel test (JIS K6854-3) was performed.
- the measurement of the minimum melt viscosity of the underfill material is a value measured by a parallel plate method using a rheometer (manufactured by HAAKE, RS-1). More specifically, the melt viscosity is measured in the range of 40 ° C. to 200 ° C. under the conditions of a gap of 100 ⁇ m, a rotating plate diameter of 20 mm, a rotating speed of 5 s ⁇ 1 and a heating rate of 10 ° C./min. The lowest melt viscosity in the range of 40 ° C. or more and less than 100 ° C. and the range of 100 ° C. or more and 200 ° C. or less was defined as the minimum melt viscosity in each temperature range.
- the sealing sheet was cut into a length of 7.5 mm and a width of 7.5 mm, and both were bonded together with the underfill material side facing the BGA substrate. Bonding was performed at a linear pressure of 0.2 MPa using a roll laminator under a reduced pressure of 70 ° C. and 1000 Pa. Then, the base material was peeled from the underfill material to produce a substrate with an underfill material.
- “ ⁇ ” indicates that there is no problem, deformation or breakage of the underfill material, peeling of the underfill material from the base material, etc. The resulting case was evaluated as “x”.
- the peelability to the base material when peeling the base material from the underfill material, “ ⁇ ” indicates that the base material can be peeled without any problem. The case where the material peeled from the substrate was evaluated as “x”.
- thermocompression bonding Under the following thermocompression bonding conditions, the semiconductor chip was mounted on the BGA substrate by thermocompression bonding with the BGA substrate facing the bump forming surface of the 7.3 mm square and 500 ⁇ m thick semiconductor chip. Thus, a semiconductor device in which the semiconductor chip was mounted on the BGA substrate was obtained.
- Evaluation of the generation of voids was performed by cutting and polishing between the semiconductor chip and the underfill material of the semiconductor device manufactured by the above procedure, and the polished surface was an image recognition device (trade name “C9597-11” manufactured by Hamamatsu Photonics, 1000 times), and the ratio of the total area of the void portion to the area of the underfill material was calculated.
- the case where the total area of the void portion was 0 to 5% was evaluated as “ ⁇ ”, and the case where it exceeded 5% was evaluated as “X”.
- the underfill material of the example the workability of the underfill material and the peelability from the base material were good, and the voids during mounting were sufficiently suppressed.
- the underfill material of Comparative Example 1 the elongation at break was too small, and breakage occurred during work.
- the underfill material of Comparative Example 2 since the minimum melt viscosity was too high, the base material was peeled off during the operation, and the embedding property of the underfill material into the irregularities of the semiconductor chip was increased when the semiconductor chip was mounted. Not enough and voids were generated. Furthermore, in the underfill material of Comparative Example 3, since the minimum melt viscosity was too low and the tackiness was high, workability was lowered, and voids were generated due to outgas components from the underfill material during mounting. It was.
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Abstract
Description
前記基材からの90°剥離力:1mN/20mm以上50mN/20mm以下
25℃における破断伸度:10%以上
40℃以上100℃未満における最低粘度:20000Pa・s以下
100℃以上200℃以下における最低粘度:100Pa・s以上
当該封止シートを準備する準備工程と、
前記被着体上の前記半導体素子との接続位置を覆うように前記封止シートのアンダーフィル材を前記被着体に貼り合わせる貼合せ工程と、
前記被着体に貼り合わせたアンダーフィル材から前記基材を剥離する剥離工程と、
前記被着体と前記半導体素子の間の空間を前記アンダーフィル材で充填しつつ前記半導体素子に形成された突起電極を介して前記半導体素子と前記被着体とを電気的に接続する接続工程と
を含む半導体装置の製造方法も含まれる。
前記基材からの90°剥離力:1mN/20mm以上50mN/20mm以下
25℃における破断伸度:10%以上
40℃以上100℃未満における最低粘度:20000Pa・s以下
100℃以上200℃以下における最低粘度:100Pa・s以上
当該封止シートを準備する準備工程と、
前記被着体上の前記半導体素子との接続位置を覆うように前記封止シートのアンダーフィル材を前記被着体に貼り合わせる貼合せ工程と、
前記被着体に貼り合わせたアンダーフィル材から前記基材を剥離する剥離工程と、
前記被着体と前記半導体素子の間の空間を前記アンダーフィル材で充填しつつ前記半導体素子に形成された突起電極を介して前記半導体素子と前記被着体とを電気的に接続する接続工程と
を含む半導体装置の製造方法も含まれる。
準備工程では、封止シート10を準備する(図1参照)。この封止シート10は、基材1と、該基材1上に設けられた以下の特性を有するアンダーフィル材2とを備える。
前記基材からの90°剥離力:1mN/20mm以上50mN/20mm以下
25℃における破断伸度:10%以上
40℃以上100℃未満における最低粘度:20000Pa・s以下
100℃以上200℃以下における最低粘度:100Pa・s以上
上記基材1は封止シート10の強度母体となるものである。例えば、低密度ポリエチレン、直鎖状ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、超低密度ポリエチレン、ランダム共重合ポリプロピレン、ブロック共重合ポリプロピレン、ホモポリプロレン、ポリブテン、ポリメチルペンテン等のポリオレフィン、エチレン-酢酸ビニル共重合体、アイオノマー樹脂、エチレン-(メタ)アクリル酸共重合体、エチレン-(メタ)アクリル酸エステル(ランダム、交互)共重合体、エチレン-ブテン共重合体、エチレン-ヘキセン共重合体、ポリウレタン、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル、ポリカーボネート、ポリイミド、ポリエーテルエーテルケトン、ポリイミド、ポリエーテルイミド、ポリアミド、全芳香族ポリアミド、ポリフェニルスルフイド、アラミド(紙)、ガラス、ガラスクロス、フッ素樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、セルロース系樹脂、シリコーン樹脂、金属(箔)、紙等が挙げられる。
本実施形態におけるアンダーフィル材2は、表面実装された半導体素子5と被着体6との間の空間を充填する封止用フィルムとして用いることができる(図2C参照)。
<重量平均分子量の測定条件>
GPC装置:東ソー製、HLC-8120GPC
カラム:東ソー製、(GMHHR-H)+(GMHHR-H)+(G2000HHR)
流量:0.8mL/min
濃度:0.1wt%
注入量:100μL
カラム温度:40℃
溶離液:THF
本実施形態に係るカルボキシル基含有化合物としては、分子内にカルボキシル基を少なくとも1つ有し、酸解離定数pKaが3.5以上であってフラックス機能を有する化合物であれば特に限定されない。カルボキシル基含有化合物のpKaは3.5以上であればよいが、エポキシ樹脂との反応の抑制とともに、可撓性の経時的安定性及びフラックス機能の発現の観点から、3.5以上7.0以下が好ましく、4.0以上6.0以下がより好ましい。なお、カルボキシル基が2つ以上ある場合は第一解離定数pKa1を酸解離定数とし、この第一解離定数pKa1が上記範囲にあるものが好ましい。また、pKaは、カルボキシル基含有化合物の希薄水溶液条件下で、酸解離定数Ka=[H3O+][B-]/[BH]を測定し、pKa=-logKaにより求められる。ここでBHは、カルボキシル基含有化合物を表し、B-はカルボキシル基含有化合物の共役塩基を表す。pKaの測定方法は、pHメーターを用いて水素イオン濃度を測定し、該当物質の濃度と水素イオン濃度から算出することができる。
上記芳香族カルボン酸は、分子内にアルキル基、アルコキシ基、アリールオキシ基、アリール基及びアルキルアミノ基からなる群より選択される少なくとも1種の置換基を有していれば特に限定されない。芳香族カルボン酸の上記置換基を除く母体骨格としては特に限定されず、安息香酸、ナフタレンカルボン酸等が挙げられる。芳香族カルボン酸は、これらの母体骨格の芳香環上に上記置換基を有している。このうち、シート状封止組成物中での安定性やエポキシ樹脂との低反応性の観点から、芳香族カルボン酸の母体骨格としては安息香酸が好ましい。
上記脂肪族カルボン酸としては特に限定されず、鎖状脂肪族(モノ)カルボン酸、脂環式(モノ)カルボン酸、鎖状脂肪族多価カルボン酸、又は脂環式多価カルボン酸のいずれであってもよい。また、それぞれの態様を組み合わせて用いてもよい。
まず、基材1は、従来公知の製膜方法により製膜することができる。当該製膜方法としては、例えばカレンダー製膜法、有機溶媒中でのキャスティング法、密閉系でのインフレーション押出法、Tダイ押出法、共押出し法、ドライラミネート法等が例示できる。
貼合せ工程では、被着体6上の前記半導体素子との接続位置を覆うように前記封止シートのアンダーフィル材2を前記被着体6に貼り合わせる(図2A参照)。まず、封止シート10のアンダーフィル材2上に任意に設けられたセパレータを適宜に剥離し、前記被着体6の導電材7が形成された回路面とアンダーフィル材2とを対向させ、前記アンダーフィル材2と前記被着体6とを圧着により貼り合わせる。
剥離工程では、前記被着体6に貼り合わせたアンダーフィル材2から前記基材1を剥離する(図2B参照)。基材1の剥離は人の手によってもよく、機械的に剥離してもよい。上述のように、アンダーフィル材2の基材に対する90°剥離力を所定範囲としているので、アンダーフィル材2の破断や変形、アンダーフィル材2の被着体6からの剥離を生じさせることなくスムーズに基材1を剥離することができる。
接続工程では、前記被着体6と前記半導体素子5の間の空間を前記アンダーフィル材2で充填しつつ前記半導体素子5に形成された突起電極4を介して前記半導体素子5と前記被着体6とを電気的に接続する(図2C参照)。
半導体素子5としては、一方の回路面に複数の突起電極4が形成されていてもよく(図2C参照)、半導体素子5の両方の回路面に突起電極が形成されていてもよい(図示せず)。バンプや導電材等の突起電極の材質としては、特に限定されず、例えば、錫-鉛系金属材、錫-銀系金属材、錫-銀-銅系金属材、錫-亜鉛系金属材、錫-亜鉛-ビスマス系金属材等の半田類(合金)や、金系金属材、銅系金属材などが挙げられる。突起電極の高さも用途に応じて定められ、一般的には15~100μm程度である。もちろん、半導体素子5における個々の突起電極の高さは同一でも異なっていてもよい。
0.5≦Y/X≦2
半導体素子5と被着体6との電気的接続の手順としては、半導体素子5を、半導体素子5の回路面が被着体6と対向する形態で、被着体6に常法に従い固定させる。例えば、半導体素子5に形成されているバンプ(突起電極)4を、被着体6の接続パッドに被着された接合用の導電材7(半田など)に接触させて押圧しながら導電材を溶融させることにより、半導体素子5と被着体6との電気的接続を確保し、半導体素子5を被着体6に固定させることができる。被着体6の回路面にはアンダーフィル材2が貼り付けられているので、半導体素子5と被着体6との電気的接続と同時に、半導体素子5と被着体6との間の空間がアンダーフィル材2により充填されることになる。
なお、接続工程における加熱処理によりアンダーフィル材2が未硬化の場合、アンダーフィル材2を加熱により硬化させる。これにより、半導体素子5の回路面を保護することができるとともに、半導体素子5と被着体6との間の接続信頼性を確保することができる。加熱条件としては特に限定されず、150~200℃程度で10~120分加熱すればよい。なお、上記接続工程にて加えられる熱によりアンダーフィル材が硬化する場合は、本工程を省略することができる。
次に、実装された半導体素子5を備える半導体装置30全体を保護するために封止工程を行ってもよい。封止工程は、封止樹脂を用いて行われる。このときの封止条件としては特に限定されないが、通常、175℃で60秒間~90秒間の加熱を行うことにより、封止樹脂の熱硬化が行われるが、本発明はこれに限定されず、例えば165℃~185℃で、数分間キュアすることができる。
次に、当該封止シートを用いて得られる半導体装置について図面を参照しつつ説明する(図2C参照)。本実施形態に係る半導体装置30では、半導体素子5と被着体6とが、半導体素子5上に形成されたバンプ(突起電極)4及び被着体6上に設けられた導電材7を介して電気的に接続されている。また、半導体素子5と被着体6との間には、その空間を充填するようにアンダーフィル材2が配置されている。半導体装置30は、封止シート10を用いる上記製造方法にて得られるので、半導体素子5とアンダーフィル材2との間においてボイドの発生が抑制されている。従って、半導体素子5の表面保護、及び半導体素子5と被着体6との間の空間の充填が十分なレベルとなり、半導体装置30として高い信頼性を発揮することができる。
(封止シートの作製)
以下の成分を表1に示す割合でメチルエチルケトンに溶解して、固形分濃度が23.6~60.6重量%となる接着剤組成物の溶液を調製した。
エポキシ樹脂2:商品名「エピコート1004」、JER株式会社製
フェノール樹脂1:商品名「ミレックスXLC-4L」三井化学株式会社製
フェノール樹脂2(25℃で液状):商品名「MEH-8005」、明和化成株式会社製
エラストマー1:アクリル酸エチル-メチルメタクリレートを主成分とするアクリル酸エステル系ポリマー(商品名「パラクロンW-197CM」、根上工業株式会社製)
エラストマー2:アクリル酸ブチルーアクリロニトリルを主成分とするアクリル酸エステル系ポリマー(商品名「SG-P3」、長瀬ケムテックス株式会社製)
フィラー:球状シリカ(商品名「SO-25R」、株式会社アドマテックス製)
有機酸:「2-フェニル安息香酸」、(東京化成株式会社製
硬化剤:イミダゾール触媒(商品名「2MA-OK」、四国化成株式会社製)
実施例及び比較例の封止シート(アンダーフィル材の熱硬化前)を用いて以下の評価を行った。各結果を表1に示す。
アンダーフィル材を基材から剥離する際の剥離力(mN/20mm)を測定した。具体的には、封止シートを長さ100mm×幅20mmに切りだして試験片とした。試験片を引張試験機(商品名「オートグラフAGS-H」、(株)島津製作所製)にセットし、温度25±2℃、剥離角度90°、剥離速度300mm/min、チャック間距離100mmの条件下でT型剥離試験(JIS K6854-3)を行った。
ロールラミネーター(装置名「MRK-600」、株式会社エム・シー・ケー製)を用いて、70℃、0.2MPaでアンダーフィル材を積層することによって厚さ120μmの測定用アンダーフィル材を得た。測定用アンダーフィル材を幅10mm×長さ30mmに切断して試験片とした後、引張試験機として「オートグラフASG-50D型」(島津製作所製)を用い、引張速度50mm/min、チャック間距離10mm、25℃で引張試験を行った。試験前のチャック間距離に対する試験片が破断した時のチャック間距離の比を求めて破断伸度(%)とした。
アンダーフィル材の最低溶融粘度の測定は、レオメーター(HAAKE社製、RS-1)を用いて、パラレルプレート法により測定した値である。より詳細には、ギャップ100μm、回転プレート直径20mm、回転速度5s-1、昇温速度10℃/分の条件にて、40℃から200℃の範囲で溶融粘度を測定し、その際に得られる40℃以上100℃未満の範囲、及び100℃以上200℃以下の範囲での溶融粘度の最低値をそれぞれの温度範囲での最低溶融粘度とした。
封止シートを長さ7.5mm×幅7.5mmに切り出し、アンダーフィル材側をBGA基板に対向させて両者を貼り合わせた。貼り合わせは、70℃、1000Paの減圧下、ロールラミネーターを用いて線圧0.2MPaにて行った。その後、アンダーフィル材から基材を剥離して、アンダーフィル材付き基板を作製した。アンダーフィル材の作業性に関し、アンダーフィル材の切り出しから貼り合わせまでを行う際、問題なく行えた場合を「○」、アンダーフィル材の変形や破断、アンダーフィル材の基材からの剥離等が生じた場合を「×」として評価した。また、基材に対する剥離性に関し、アンダーフィル材から基材を剥離する際に、問題なく基材を剥離可能であった場合を「○」、アンダーフィル材が基材に移行したり、アンダーフィル材が基板から剥離したりした場合を「×」として評価した。
下記の熱圧着条件により、7.3mm角、厚さ500μmの半導体チップのバンプ形成面とBGA基板とを対向させた状態で半導体チップをBGA基板に熱圧着して半導体チップの実装を行った。これにより、半導体チップがBGA基板に実装された半導体装置を得た。
ピックアップ装置:商品名「FCB-3」パナソニック製
加熱温度:260℃
荷重:30N
保持時間:10秒
2 アンダーフィル材
3 半導体ウェハ
4 突起電極
5 半導体素子
6 被着体
7 導電材
10 封止シート
20 封止シート付き基板
30 半導体装置
Claims (9)
- 基材と、該基材上に設けられた以下の特性を有するアンダーフィル材とを備える封止シート。
前記基材からの90°剥離力:1mN/20mm以上50mN/20mm以下
25℃における破断伸度:10%以上
40℃以上100℃未満における最低粘度:20000Pa・s以下
100℃以上200℃以下における最低粘度:100Pa・s以上 - 前記アンダーフィル材が熱可塑性樹脂と熱硬化性樹脂とを含む請求項1に記載の封止シート。
- 前記熱硬化性樹脂は、25℃で液状の熱硬化性樹脂を含み、
前記熱硬化性樹脂の全重量に対する前記25℃で液状の熱硬化性樹脂の重量の割合が5重量%以上40重量%以下である請求項2に記載の封止シート。 - 前記熱可塑性樹脂がアクリル樹脂を含み、前記熱硬化性樹脂がエポキシ樹脂とフェノール樹脂とを含む請求項2又は3に記載の封止シート。
- 前記アンダーフィル材はフラックス剤を含む請求項1~4のいずれか1項に記載の封止シート。
- 前記基材が熱可塑性樹脂を含む請求項1~5のいずれか1項に記載の封止シート。
- 前記熱可塑性樹脂はポリエチレンテレフタレートである請求項6に記載の封止シート。
- 被着体と、該被着体と電気的に接続された半導体素子と、該被着体と該半導体素子との間の空間を充填するアンダーフィル材とを備える半導体装置の製造方法であって、
請求項1~7のいずれか1項に記載の封止シートを準備する準備工程と、
前記被着体上の前記半導体素子との接続位置を覆うように前記封止シートのアンダーフィル材を前記被着体に貼り合わせる貼合せ工程と、
前記被着体に貼り合わせたアンダーフィル材から前記基材を剥離する剥離工程と、
前記被着体と前記半導体素子の間の空間を前記アンダーフィル材で充填しつつ前記半導体素子に形成された突起電極を介して前記半導体素子と前記被着体とを電気的に接続する接続工程と
を含む半導体装置の製造方法。 - 基板と、該基板に貼り付けられた請求項1~7のいずれか1項に記載の封止シートとを備える封止シート付き基板。
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| CN201480018205.0A CN105074894A (zh) | 2013-03-26 | 2014-03-19 | 密封片材、半导体装置的制造方法及带有密封片材的基板 |
| KR1020157019826A KR20150135206A (ko) | 2013-03-26 | 2014-03-19 | 밀봉 시트, 반도체 장치의 제조 방법 및 밀봉 시트 구비 기판 |
| US14/779,511 US20160056123A1 (en) | 2013-03-26 | 2014-03-19 | Sealing sheet, method for producing semiconductor device, and substrate with sealing sheet |
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| JP2013-064586 | 2013-03-26 | ||
| JP2013064586A JP6321910B2 (ja) | 2013-03-26 | 2013-03-26 | 封止シート、半導体装置の製造方法及び封止シート付き基板 |
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| US (1) | US20160056123A1 (ja) |
| JP (1) | JP6321910B2 (ja) |
| KR (1) | KR20150135206A (ja) |
| CN (1) | CN105074894A (ja) |
| TW (1) | TW201446522A (ja) |
| WO (1) | WO2014156883A1 (ja) |
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| JPWO2017090439A1 (ja) * | 2015-11-24 | 2018-09-06 | リンテック株式会社 | 回路部材接続用樹脂シート |
| JP6945276B2 (ja) * | 2016-03-31 | 2021-10-06 | デクセリアルズ株式会社 | 異方性導電接続構造体 |
| KR102694680B1 (ko) | 2016-08-01 | 2024-08-14 | 삼성디스플레이 주식회사 | 전자 소자, 이의 실장 방법 및 이를 포함하는 표시 장치의 제조 방법 |
| HUE063199T2 (hu) | 2017-03-15 | 2023-12-28 | Samsonite Ip Holdings Sarl | Eljárás poggyászcikk elõállítására, amely során hõre lágyuló polimerbõl álló laminált filmrétegeket laminálunk |
| CN120003120A (zh) * | 2017-03-17 | 2025-05-16 | 汉高股份有限及两合公司 | 多层制品的工作寿命改善及其制备方法和用途 |
| TWI787326B (zh) * | 2017-09-08 | 2022-12-21 | 日商杜邦東麗特殊材料股份有限公司 | 密封光半導體元件的製造方法 |
| KR102457939B1 (ko) * | 2017-11-14 | 2022-10-26 | 한국전자통신연구원 | 열경화막의 형성 방법 및 이를 이용한 반도체 패키지의 제조 방법 |
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- 2014-03-19 WO PCT/JP2014/057537 patent/WO2014156883A1/ja not_active Ceased
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| Publication number | Publication date |
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| CN105074894A (zh) | 2015-11-18 |
| JP6321910B2 (ja) | 2018-05-09 |
| US20160056123A1 (en) | 2016-02-25 |
| JP2014192237A (ja) | 2014-10-06 |
| TW201446522A (zh) | 2014-12-16 |
| KR20150135206A (ko) | 2015-12-02 |
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