WO2014142154A1 - 補強シート及び二次実装半導体装置の製造方法 - Google Patents
補強シート及び二次実装半導体装置の製造方法 Download PDFInfo
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- WO2014142154A1 WO2014142154A1 PCT/JP2014/056441 JP2014056441W WO2014142154A1 WO 2014142154 A1 WO2014142154 A1 WO 2014142154A1 JP 2014056441 W JP2014056441 W JP 2014056441W WO 2014142154 A1 WO2014142154 A1 WO 2014142154A1
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- semiconductor device
- pressure
- adhesive layer
- thermosetting resin
- reinforcing sheet
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Definitions
- the present invention relates to a reinforcing sheet and a method for manufacturing a secondary mounting semiconductor device.
- the surface mount type suitable for high-density mounting is the mainstream of the semiconductor package instead of the conventional pin insertion type.
- a semiconductor device in which a semiconductor element is sealed with a resin is directly soldered to a printed circuit board for secondary mounting or the like via a connection terminal such as a solder ball.
- the present invention provides a reinforcing sheet capable of producing a secondary mounting semiconductor device having excellent impact resistance and capable of improving the efficiency of the secondary mounting process, and a method for manufacturing a secondary mounting semiconductor device using the same. Objective.
- the present inventors combined a conventional processing tape such as a back grind tape for back surface grinding or a dicing tape for dicing with a predetermined thermosetting resin sheet to form a protruding electrode reinforcing sheet,
- a conventional processing tape such as a back grind tape for back surface grinding or a dicing tape for dicing
- a predetermined thermosetting resin sheet to form a protruding electrode reinforcing sheet
- base part the base part on the mounting substrate side
- the present inventors have found that the object can be achieved by adopting the following configuration, and have completed the present invention.
- the present invention provides a reinforcing sheet for reinforcing a secondary mounting semiconductor device in which a primary mounting semiconductor device having a protruding electrode formed on a first main surface is electrically connected to a wiring board through the protruding electrode. Because A base material layer, an adhesive layer and a thermosetting resin layer are provided in this order, The pressure-sensitive adhesive layer has a breaking strength of 0.07 MPa or more and a melt viscosity at 60 to 100 ° C. of 4000 Pa ⁇ s or less.
- the reinforcing sheet includes a processing tape including a base material layer and an adhesive layer, and a thermosetting resin layer capable of reinforcing the base portion of the protruding electrode, so that the base portion of the protruding electrode is reinforced and the back surface.
- Processing such as grinding and dicing can be performed continuously, a secondary mounting semiconductor device having excellent impact resistance can be manufactured, and the efficiency of the manufacturing process can be easily achieved.
- the breaking strength of the pressure-sensitive adhesive layer is 0.07 MPa or more, it is possible to suppress the breakage of the pressure-sensitive adhesive layer even when peeling from the processing tape of the primary mounting semiconductor device, and the adhesive residue on the protruding electrodes Can be prevented.
- the protruding electrode easily enters the pressure-sensitive adhesive layer when the reinforcing sheet and the primary mounting semiconductor device are bonded together under heating. It is possible to finely adjust the arrangement position of the thermosetting resin layer when the protruding electrode is viewed from the side. As a result, even if the shape and size of the protruding electrode are changed, the amount of the intrusion can be adjusted, so that it is possible to cope with the reinforcement of the root portion of various protruding electrodes.
- the measuring method of breaking strength and melt viscosity is based on description of an Example.
- the thickness of the thermosetting resin layer is preferably 50% or less of the height of the protruding electrode.
- the peel force between the thermosetting resin layer and the pressure-sensitive adhesive layer is preferably 0.02 N / 20 mm or more and 0.3 N / 20 mm or less.
- the reinforcing sheet preferably further includes an intermediate layer made of a thermoplastic resin between the base material layer and the pressure-sensitive adhesive layer.
- an intermediate layer made of a thermoplastic resin between the base material layer and the pressure-sensitive adhesive layer.
- the present invention provides a method for manufacturing a secondary mounting semiconductor device in which a primary mounting semiconductor device having a protruding electrode formed on a first main surface is electrically connected to a wiring board through the protruding electrode, (A) a step of bonding the reinforcing sheet to the first main surface of the primary mounting semiconductor device; (B) A step of processing the primary mounting semiconductor device while being held by the reinforcing sheet; (C) peeling the thermosetting resin layer and the pressure-sensitive adhesive layer in the reinforcing sheet to obtain a primary mounting semiconductor device with the thermosetting resin layer; and (D) with the thermosetting resin layer.
- a method of manufacturing a secondary mounting semiconductor device including a step of electrically connecting a primary mounting semiconductor device to a wiring board via the protruding electrodes is also included.
- the reinforcing sheet is preferably bonded so that the protruding electrode reaches the pressure-sensitive adhesive layer. Thereby, the electrical connection between the protruding electrode and the wiring board can be secured, and the connection reliability can be improved.
- the pressure-sensitive adhesive layer may be a radiation-curable pressure-sensitive adhesive layer
- the step (B) may be performed after the radiation-curable pressure-sensitive adhesive layer is irradiated with radiation.
- the present invention provides a reinforcing sheet for reinforcing a secondary mounting semiconductor device in which a primary mounting semiconductor device having a protruding electrode formed on a first main surface is electrically connected to a wiring board via the protruding electrode.
- the base material layer, the pressure-sensitive adhesive layer, and the thermosetting resin layer are provided in this order.
- the pressure-sensitive adhesive layer has a breaking strength of 0.07 MPa or more and a melt viscosity at 60 to 100 ° C. of 4000 Pa ⁇ s or less. is there.
- the present invention is also a method for manufacturing a secondary mounting semiconductor device in which a primary mounting semiconductor device having a protruding electrode formed on a first main surface is electrically connected to a wiring board via the protruding electrode, (A) A step of bonding the reinforcing sheet to the first main surface of the primary mounting semiconductor device, (B) A step of processing the primary mounting semiconductor device while being held by the reinforcing sheet, (C) In the reinforcing sheet Peeling the thermosetting resin layer and the pressure-sensitive adhesive layer to obtain a primary mounting semiconductor device with the thermosetting resin layer; and (D) wiring the primary mounting semiconductor device with the thermosetting resin layer. It is a manufacturing method of the secondary mounting semiconductor device including the process of electrically connecting to a substrate via the projection electrode.
- a first embodiment which is an embodiment of the present invention, will be described along with a method for manufacturing a secondary mounting semiconductor device.
- Step (A) In the step (A), a predetermined reinforcing sheet is bonded to the first main surface of the primary mounting semiconductor device. Below, a reinforcement sheet is demonstrated first and then the manufacturing process of the secondary mounting semiconductor device using this reinforcement sheet is demonstrated.
- the reinforcing sheet 8 includes a base material layer 1a, an adhesive layer 1b, and a thermosetting resin layer 2 in this order.
- the base material layer 1a and the pressure-sensitive adhesive layer 1b constitute the back grinding tape 1.
- the thermosetting resin layer 2 should just be provided with sufficient size for bonding with the resin sealing assembly of the primary mounting semiconductor device 10 (refer FIG. 2A), You may laminate
- the back surface grinding tape 1 includes a base material layer 1a and an adhesive layer 1b laminated on the base material layer 1a.
- the thermosetting resin layer 2 is laminated
- the base material layer 1 a is a strength matrix of the reinforcing sheet 8.
- 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,
- a material of the base material layer 1a a polymer such as a cross-linked body of the above resin can be mentioned.
- the plastic film may be used unstretched or may be uniaxially or biaxially stretched as necessary.
- the surface of the base material layer 1a has a conventional surface treatment, for example, 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. Or a physical treatment or a coating treatment with a primer (for example, an adhesive substance described later) can be applied.
- a conventional surface treatment for example, chromic acid treatment, ozone exposure, flame exposure, high piezoelectric impact exposure, ionizing radiation treatment, etc.
- a physical treatment or a coating treatment with a primer for example, an adhesive substance described later
- the base material layer 1a can be used by appropriately selecting the same type or different types, and a blend of several types can be used as necessary.
- a conductive material vapor deposition layer 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 layer 1a can be provided.
- Antistatic ability can also be imparted by adding an antistatic agent to the base material layer.
- the base material layer 1a may be a single layer or two or more types.
- the thickness of the base material layer 1a can be appropriately determined, and is generally about 5 ⁇ m to 200 ⁇ m, preferably 35 ⁇ m to 120 ⁇ m.
- various 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 breaking strength of the adhesive layer 1b should just be 0.07 Mpa or more, Preferably it is 0.08 Mpa or more, More preferably, it is 0.1 Mpa or more. Since the rupture strength of the pressure-sensitive adhesive layer 1b is 0.07 MPa or more, the rupture of the pressure-sensitive adhesive layer can be suppressed even when the primary mounting semiconductor device is peeled off from the back surface grinding tape. Adhesive residue on the resin layer can be prevented.
- the upper limit of the breaking strength is not particularly limited, but is preferably 2.0 MPa or less, and more preferably 1.0 MPa or less, from the viewpoint of the ability to follow bump irregularities. When the pressure-sensitive adhesive layer 1b is a radiation-curing pressure-sensitive adhesive layer (described later), it is only necessary that the breaking strength after curing satisfies the above range.
- the melt viscosity of the pressure-sensitive adhesive layer 1b at 60 to 100 ° C. may be 4000 Pa ⁇ s or less, preferably 3500 Pa ⁇ s or less, more preferably 3000 Pa ⁇ s or less.
- the lower limit value of the melt viscosity is not particularly limited, it is preferably 100 Pa ⁇ s or more, and more preferably 500 Pa ⁇ s or more, from the viewpoint of preventing the adhesive layer from sticking out at the time of bonding and preventing adhesive residue on the protruding electrodes.
- the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 1b firmly holds the primary mounting semiconductor device via the thermosetting resin layer during back surface grinding, and the primary mounting semiconductor device with the thermosetting resin layer after back surface grinding.
- the primary mounting semiconductor device with the thermosetting resin layer can be controlled so as to be peelable when transferred to the dicing tape.
- a general pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive can be used.
- an acrylic pressure-sensitive adhesive having an acrylic polymer as a base polymer from the viewpoint of cleanability of an electronic component that is difficult to contaminate semiconductor wafers, glass, etc., with an organic solvent such as ultrapure water or alcohol. is preferred.
- acrylic polymer examples include those using acrylic acid ester as a main monomer component.
- acrylic esters include (meth) acrylic acid alkyl esters (for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, s-butyl ester, t-butyl ester, pentyl ester, Isopentyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethylhexyl ester, isooctyl ester, nonyl ester, decyl ester, isodecyl ester, undecyl ester, dodecyl ester, tridecyl ester, tetradecyl ester, hexadecyl ester , Octadecyl esters, eicosyl esters, etc., alkyl
- the acrylic polymer includes units corresponding to the other monomer components copolymerizable with the (meth) acrylic acid alkyl ester or cycloalkyl ester, if necessary, for the purpose of modifying cohesive force, heat resistance, and the like. You may go out.
- Such monomer components include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; maleic anhydride Acid anhydride monomers such as itaconic anhydride; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate Hydroxyl group-containing monomers such as 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl (meth) acrylate;
- the Sulfonic acid groups such as lensulfonic acid, allylsulfonic acid, 2- (meth)
- a polyfunctional monomer or the like can be included as a monomer component for copolymerization as necessary.
- polyfunctional monomers include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, urethane (meth) Examples include acrylates. These polyfunctional monomers can also be used alone or in combination of two or more. The amount of the polyfunctional monomer used is preferably 30% by weight
- the acrylic polymer can be obtained by subjecting a single monomer or a mixture of two or more monomers to polymerization.
- the polymerization can be performed by any method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization and the like.
- the content of the low molecular weight substance is preferably small.
- the number average molecular weight of the acrylic polymer is preferably 300,000 or more, more preferably about 400,000 to 3 million.
- an external cross-linking agent can be appropriately employed for the pressure-sensitive adhesive in order to increase the number average molecular weight of an acrylic polymer or the like that is a base polymer.
- the external crosslinking method include a method in which a so-called crosslinking agent such as a polyisocyanate compound, an epoxy compound, an aziridine compound, or a melamine crosslinking agent is added and reacted.
- a so-called crosslinking agent such as a polyisocyanate compound, an epoxy compound, an aziridine compound, or a melamine crosslinking agent is added and reacted.
- the amount used is appropriately determined depending on the balance with the base polymer to be cross-linked, and further depending on the intended use as an adhesive. Generally, about 5 parts by weight or less, more preferably 0.1 to 5 parts by weight, is preferably added to 100 parts by weight of the base polymer.
- additives such as various conventionally known tackifiers and anti-aging agents may be used for the pressure-sensitive adhesive
- the pressure-sensitive adhesive layer 1b can be formed of a radiation curable pressure-sensitive adhesive.
- Radiation curable pressure-sensitive adhesives can easily reduce the adhesive strength by increasing the degree of crosslinking by irradiation with radiation such as ultraviolet rays, and can easily remove the primary mounting semiconductor device with a thermosetting resin layer. Can do. Examples of radiation include X-rays, ultraviolet rays, electron beams, ⁇ rays, ⁇ rays, and neutron rays.
- the radiation curable pressure-sensitive adhesive those having a radiation curable functional group such as a carbon-carbon double bond and exhibiting adhesiveness can be used without particular limitation.
- the radiation curable pressure-sensitive adhesive include additive-type radiation curable pressure-sensitive adhesives in which radiation-curable monomer components and oligomer components are blended with general pressure-sensitive pressure-sensitive adhesives such as the above-mentioned acrylic pressure-sensitive adhesives and rubber-based pressure-sensitive adhesives. An agent can be illustrated.
- Examples of the radiation curable monomer component to be blended include urethane oligomer, urethane (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol.
- Examples thereof include stall tetra (meth) acrylate, dipentaerystol monohydroxypenta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,4-butanediol di (meth) acrylate and the like.
- the radiation curable oligomer component examples include urethane, polyether, polyester, polycarbonate, and polybutadiene oligomers, and those having a weight average molecular weight in the range of about 100 to 30000 are suitable.
- the compounding amount of the radiation curable monomer component or oligomer component can be appropriately determined in such an amount that the adhesive force of the pressure-sensitive adhesive layer can be reduced depending on the type of the pressure-sensitive adhesive layer. In general, the amount is, for example, about 5 to 500 parts by weight, preferably about 40 to 150 parts by weight with respect to 100 parts by weight of the base polymer such as an acrylic polymer constituting the pressure-sensitive adhesive.
- the radiation curable pressure-sensitive adhesive has a carbon-carbon double bond as a base polymer in the polymer side chain or main chain or at the main chain terminal.
- Intrinsic radiation curable adhesives using Intrinsic radiation curable adhesives do not need to contain oligomer components, which are low molecular components, or do not contain many, so they are stable without the oligomer components, etc. moving through the adhesive over time. This is preferable because an adhesive layer having a layered structure can be formed.
- Such a base polymer is preferably one having an acrylic polymer as a basic skeleton.
- Examples of the basic skeleton of the acrylic polymer include the acrylic polymers exemplified above.
- the method for introducing the carbon-carbon double bond into the acrylic polymer is not particularly limited, and various methods can be adopted.
- the carbon-carbon double bond can be easily introduced into the polymer side chain for easy molecular design.
- a compound having a functional group capable of reacting with the functional group and a carbon-carbon double bond is converted into a radiation-curable carbon-carbon double bond. Examples of the method include condensation or addition reaction while maintaining the above.
- combinations of these functional groups include carboxylic acid groups and epoxy groups, carboxylic acid groups and aziridyl groups, hydroxyl groups and isocyanate groups.
- a combination of a hydroxyl group and an isocyanate group is preferable because of easy tracking of the reaction.
- the functional group may be on either side of the acrylic polymer and the above compound as long as the acrylic polymer having the carbon-carbon double bond is generated by the combination of these functional groups. In the above preferred combination, it is preferable that the acrylic polymer has a hydroxyl group and the compound has an isocyanate group.
- examples of the isocyanate compound having a carbon-carbon double bond include methacryloyl isocyanate, 2-methacryloyloxyethyl isocyanate, m-isopropenyl- ⁇ , ⁇ -dimethylbenzyl isocyanate, and the like.
- acrylic polymer those obtained by copolymerizing the above-exemplified hydroxy group-containing monomers, ether compounds of 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, or the like are used.
- a base polymer having a carbon-carbon double bond can be used alone, but the radiation-curable monomer does not deteriorate the characteristics.
- Components and oligomer components can also be blended.
- the radiation-curable oligomer component or the like is usually in the range of 30 parts by weight, preferably in the range of 0 to 10 parts by weight, with respect to 100 parts by weight of the base polymer.
- the radiation curable pressure-sensitive adhesive preferably contains a photopolymerization initiator when cured by ultraviolet rays or the like.
- the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, ⁇ -hydroxy- ⁇ , ⁇ ′-dimethylacetophenone, 2-methyl-2-hydroxypropio ⁇ -ketol compounds such as phenone and 1-hydroxycyclohexyl phenyl ketone; methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, 2-methyl-1- [4- ( Acetophenone compounds such as methylthio) -phenyl] -2-morpholinopropane-1; benzoin ether compounds such as benzoin ethyl ether, benzoin isopropyl ether and anisoin methyl ether; ketal compounds such as benzyldimethyl ketal; 2-naphthal
- oxygen air
- a method of covering the surface of the pressure-sensitive adhesive layer 1b with a separator, a method of irradiating radiation such as ultraviolet rays in a nitrogen gas atmosphere, and the like can be mentioned.
- various additives for example, a colorant, a thickener, a bulking agent, a filler, a tackifier, a plasticizer, an antiaging agent, Antioxidants, surfactants, crosslinking agents, etc.
- a colorant for example, a colorant, a thickener, a bulking agent, a filler, a tackifier, a plasticizer, an antiaging agent, Antioxidants, surfactants, crosslinking agents, etc.
- the thickness of the pressure-sensitive adhesive layer 1b is not particularly limited, it is preferably about 1 to 100 ⁇ m from the viewpoint of adjusting the breaking strength and compatibility of fixing and holding the thermosetting resin layer 2.
- the thickness is preferably 2 to 80 ⁇ m, more preferably 5 to 60 ⁇ m.
- thermosetting resin layer 2 in the present embodiment can be suitably used as a reinforcing film that reinforces the root portion on the primary mounting substrate side of the protruding electrode of the primary mounting semiconductor device that is secondarily mounted on the surface.
- thermosetting resin layer examples include those in which a thermoplastic resin and a thermosetting resin are used in combination.
- 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 secondary mounting semiconductor device 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 that corrode the protruding electrodes 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 secondary mounting 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.
- thermosetting resin layer 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 secondary mounting semiconductor device can be secured.
- the mixing ratio of the epoxy resin and the phenol resin is 10 to 1000 parts by weight with respect to 100 parts by weight of the acrylic resin component.
- 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.
- a flux may be added to the thermosetting resin layer 2 in order to remove the oxide film on the surface of the solder ball and facilitate mounting of the semiconductor element.
- the flux is not particularly limited, and a conventionally known compound having a flux action can be used.
- thermosetting resin layer 2 of the present embodiment When the thermosetting resin layer 2 of the present embodiment is crosslinked to some extent in advance, a polyfunctional compound that reacts with a functional group at the molecular chain end of the polymer is added as a crosslinking agent during the production. It is good. Thereby, the adhesive property under high temperature can be improved and heat resistance can be improved.
- the cross-linking agent is particularly preferably a polyisocyanate compound such as tolylene diisocyanate, diphenylmethane diisocyanate, p-phenylene diisocyanate, 1,5-naphthalene diisocyanate, an adduct of polyhydric alcohol and diisocyanate.
- the addition amount of the crosslinking agent is usually preferably 0.05 to 7 parts by weight with respect to 100 parts by weight of the polymer. When the amount of the cross-linking agent is more than 7 parts by weight, the adhesive force is lowered, which is not preferable. On the other hand, if it is less than 0.05 parts by weight, the cohesive force is insufficient, which is not preferable. Moreover, you may make it include other polyfunctional compounds, such as an epoxy resin, together with such a polyisocyanate compound as needed.
- an inorganic filler can be appropriately blended in the thermosetting resin layer 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, beryllium oxide, silicon carbide, silicon nitride, and other ceramics, aluminum, copper, silver, gold, nickel, chromium, lead. , Various inorganic powders made of metals such as tin, zinc, palladium, solder, or alloys, and other carbon. 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 0.1 to 2 0.0 ⁇ m.
- the average particle size of the inorganic filler is less than 0.005 ⁇ m, the particles are likely to aggregate and it may be difficult to form the thermosetting resin layer.
- the average particle size exceeds 10 ⁇ m, the inorganic particles are likely to be caught between the thermosetting resin layer and the primary mounting substrate, and the reinforcement level is lowered to reduce the impact resistance of the secondary mounting semiconductor device. And connection reliability may be reduced.
- 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. 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 relaxation reliability in the root region of the protruding electrode may be greatly impaired. On the other hand, when the amount exceeds 400 parts by weight, the fluidity of the thermosetting resin layer 2 is lowered, and the voids and cracks may be caused without being sufficiently buried in the unevenness of the primary mounting substrate and the base space of the protruding electrode. There is.
- additives can be appropriately blended in the thermosetting resin layer 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 melt viscosity at 60 to 100 ° C. of the thermosetting resin layer 2 before thermosetting is preferably 4000 Pa ⁇ s or less, and more preferably 500 Pa ⁇ s or more and 4000 Pa ⁇ s or less.
- the thickness of the thermosetting resin layer 2 (total thickness in the case of multiple layers) is not particularly limited, considering the strength of the thermosetting resin layer 2 and the reinforcement of the base portion of the protruding electrode 4, the thickness is about 5 ⁇ m to 50 ⁇ m. It may be. Note that the thickness of the thermosetting resin layer 2 may be appropriately set in consideration of the range of the root portion to be reinforced in the protruding electrode 4.
- thermosetting resin layer 2 of the reinforcing sheet 8 is preferably protected by a separator (not shown).
- the separator has a function as a protective material that protects the thermosetting resin layer 2 until it is put to practical use.
- the separator is peeled off when the primary mounting semiconductor device 10 is stuck on the thermosetting resin layer 2 of the reinforcing sheet 8.
- 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 reinforcing sheet 8 according to the present embodiment can be prepared, for example, by separately preparing the back grinding tape 1 and the thermosetting resin layer 2 and finally bonding them together. Specifically, it can be produced according to the following procedure.
- the base material layer 1a 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.
- an adhesive composition for forming an adhesive layer is prepared. Resin, additive, etc. which were demonstrated by the term of the adhesive layer are mix
- the coating film is dried under predetermined conditions (heat-crosslinked as necessary) to form the pressure-sensitive adhesive layer 1b. To do. It does not specifically limit as a coating method, For example, roll coating, screen coating, gravure coating, etc. are mentioned. As drying conditions, for example, a drying temperature of 80 to 150 ° C. and a drying time of 0.5 to 5 minutes are performed.
- the coating film may be dried on the said dry conditions, and the adhesive layer 1b may be formed. Then, the adhesive layer 1b is bonded together with a separator on the base material layer 1a. Thereby, the tape 1 for back surface grinding provided with the base material layer 1a and the adhesive layer 1b is produced.
- thermosetting resin layer 2 is produced as follows, for example. First, an adhesive composition that is a material for forming the thermosetting resin layer 2 is prepared. As described in the section of the thermosetting resin layer, the adhesive composition contains a thermoplastic component, an epoxy resin, various additives, and the like.
- the prepared adhesive composition is applied on a base separator so as to have a predetermined thickness to form a coating film, and then the coating film is dried under predetermined conditions to form a thermosetting resin layer.
- 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.
- a coating film may be dried on the said drying conditions, and a thermosetting resin layer may be formed. Then, a thermosetting resin layer is bonded together with a separator on a base material separator.
- the separator is peeled off from the back surface grinding tape 1 and the thermosetting resin layer 2 respectively, and the both are bonded so that the thermosetting resin layer and the pressure-sensitive adhesive layer become the bonding surface.
- 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 thermosetting resin layer is peeled off, and the reinforcing sheet according to the present embodiment is obtained.
- the primary mounting semiconductor device 10 may be a semiconductor device in which the protruding electrode 4 is formed on the first main surface 3a.
- the primary mounting semiconductor device 10 refers to a semiconductor device in which a semiconductor chip or a semiconductor element 5 is connected to a protruding electrode 4 (also referred to as a solder ball, a solder bump, or a conductive ball) via a so-called interposer or substrate 3.
- the package is configured by being sealed with a sealing resin 6. Therefore, strictly speaking, what is shown in FIG. 2A is a sealed assembly in which a plurality of primary mounting semiconductor devices are sealed with resin.
- the primary mounting semiconductor is not distinguished from each other. Sometimes called a device.
- a multi-chip module (MCM), a chip size package (CSP), a ball grid array (BGA), and the like are also included in the primary mounting semiconductor device.
- MCM multi-chip module
- CSP chip size package
- BGA ball grid array
- the primary mounting semiconductor device 10 of this embodiment mainly includes an interposer 3 that can be cut out, and a semiconductor chip 5 that is arranged on the interposer 3 in an XY plane and is sealed with a sealing resin 6. And a protruding electrode 4 electrically connected to an electrode (not shown) formed on the semiconductor chip 5 with the interposer 3 interposed therebetween.
- the semiconductor chip 5 is preferably bonded to the interposer 3, and a plurality of the semiconductor chips 5 are preferably sealed together with the sealing resin 6.
- the interposer 3 is not particularly limited, and examples thereof include a ceramic substrate, a plastic (epoxy, bismaleimide triazine, polyimide, etc.) substrate, a silicon substrate, and the like.
- the form of electrode bonding between the semiconductor chip 5 and the interposer 3 is not particularly limited, and examples thereof include wire bonding using gold wires and copper wires, and bump bonding.
- Examples of the protruding electrode include gold, copper, nickel, aluminum, solder, and combinations thereof.
- the size of the protruding electrode is not particularly limited, and examples thereof include a diameter of about 100 to 300 ⁇ m.
- the thickness of the thermosetting resin layer 2 is preferably 50% or less, more preferably 48% or less, and particularly preferably 45% or less of the height of the protruding electrode 4.
- the protruding electrode 4 can reach the pressure-sensitive adhesive layer 1 b beyond the thermosetting resin layer 2.
- the protruding electrode 4 is exposed from the thermosetting resin layer 2 during the subsequent peeling of the back surface grinding tape 1 (see FIG. 2C), so that a good electrical connection with the wiring board is achieved. Achievable.
- the reinforcing sheet 8 is bonded to the first main surface 3a on which the protruding electrodes 4 of the primary mounting semiconductor device 10 are formed.
- the bonding is preferably performed under heat and pressure conditions from the viewpoint of versatility and productivity, and a roll pressure bonding method or a press pressure bonding method is suitably used.
- the laminating temperature is preferably not less than the softening point of the resin constituting the thermosetting resin layer 2 and not more than the curing reaction start temperature from the viewpoint of fluidity of the thermosetting resin layer 2.
- a temperature is usually selected from a temperature range of about 60 ° C. to 100 ° C.
- the pressing is performed while applying a pressure of preferably 0.1 to 1 MPa, more preferably 0.3 to 0.7 MPa from the viewpoint of the strength of the semiconductor device and the fluidity of the thermosetting resin sheet. If necessary, pressure bonding may be performed under reduced pressure (1 to 1000 Pa).
- Step (B) In the step (B), the back surface grinding process is performed on the primary mounting semiconductor device 10 while being held by the reinforcing sheet 8. In the grinding step, grinding is performed from the second main surface (that is, the back surface) 3b side opposite to the first main surface 3a of the primary mounting semiconductor device 10 (see FIG. 2B). In the present embodiment, only the sealing resin 6 is ground. However, the present invention is not limited to this, and the back surface of the semiconductor chip 5 may be ground. When the back surface of the semiconductor chip 5 is not resin-sealed, the back surface of the semiconductor chip 5 is ground as it is.
- the thin processing machine used for the back surface grinding of the primary mounting semiconductor device 10 is not particularly limited, and examples thereof include a grinding machine (back grinder) and a polishing pad. Further, the back surface grinding may be performed by a chemical method such as etching. The back surface grinding is performed until the primary mounting semiconductor device has a desired thickness (for example, 10 to 500 ⁇ m).
- Step (C) After the grinding step, the primary mounting semiconductor device 10 is peeled from the back surface grinding tape 1 with the thermosetting resin layer 2 attached (FIG. 2C), and the primary mounting semiconductor device 10 with the thermosetting resin layer 2 and the dicing tape. 11 are bonded together (see FIG. 2D). At this time, bonding is performed so that the second main surface 3b side of the primary mounting semiconductor device and the adhesive layer 11b of the dicing tape 11 face each other. Accordingly, the thermosetting resin layer 2 bonded to the first main surface 3a of the primary mounting semiconductor device 10 is exposed (upward in FIG. 2D).
- the dicing tape 11 has a structure in which an adhesive layer 11b is laminated on a base material layer 11a.
- the base material layer 11a and the pressure-sensitive adhesive layer 11b can be suitably prepared by using the components and the production methods shown in the paragraphs of the base material layer 1a and the pressure-sensitive adhesive layer 1b of the back grinding tape 1. Moreover, a commercially available dicing tape can also be used suitably.
- the pressure-sensitive adhesive layer 1b has radiation curability when the primary mounting semiconductor device 10 is peeled from the back surface grinding tape 1
- the pressure-sensitive adhesive layer 1b is irradiated with radiation to cure the pressure-sensitive adhesive layer 1b.
- Peeling can be easily performed.
- the radiation dose may be appropriately set in consideration of the type of radiation used, the degree of cure of the pressure-sensitive adhesive layer, and the like.
- the adhesive layer 1b does not have radiation curability, after the back surface grinding, the primary mounting semiconductor device 10 with the thermosetting resin layer 2 and the dicing tape 11 are bonded together, and then the back surface grinding tape 1 is peeled off. You may make it do.
- the peel force between the thermosetting resin layer 2 and the pressure-sensitive adhesive layer 1b is preferably 0.02 N / 20 mm or more and 0.3 N / 20 mm or less, and 0.03 N / More preferably, it is 20 mm or more and 0.2 N / 20 mm or less.
- the primary mounting semiconductor device 10 with the thermosetting resin layer 2 separated into pieces by dicing the primary mounting semiconductor device 10 and the thermosetting resin layer 2 is formed.
- the primary mounting semiconductor device 10 obtained here is integrated with the thermosetting resin layer 2 cut into the same shape. Dicing is performed according to a conventional method from the first main surface 3a side where the thermosetting resin layer 2 of the primary mounting semiconductor device 10 is bonded.
- a cutting method called full cut that cuts up to the dicing tape 11 can be adopted. It does not specifically limit as a dicing apparatus used at this process, A conventionally well-known thing can be used.
- the expanding apparatus includes a donut-shaped outer ring that can push down the dicing tape through the dicing ring, and an inner ring that has a smaller diameter than the outer ring and supports the dicing tape.
- a pickup is performed in order to collect the separated primary mounting semiconductor device 10.
- the pickup method is not particularly limited, and various conventionally known methods can be employed. For example, there is a method of pushing up each primary mounting semiconductor device 10 from the base layer side of the dicing tape with a needle and picking up the pushed up primary mounting semiconductor device 10 with a pickup device.
- the picked-up primary mounting semiconductor device 10 forms a laminated body integrally with the thermosetting resin layer 2 bonded to the first main surface 3a.
- the pickup is performed after the pressure-sensitive adhesive layer 11b is irradiated with ultraviolet rays.
- the adhesive force with respect to the primary mounting semiconductor device 10 of the adhesive layer 11b falls, and peeling of the primary mounting semiconductor device 10 becomes easy.
- the pickup can be performed without damaging the primary mounting semiconductor device 10.
- Conditions such as irradiation intensity and irradiation time at the time of ultraviolet irradiation are not particularly limited, and may be set as necessary.
- a light source used for ultraviolet irradiation for example, a low-pressure mercury lamp, a low-pressure high-power lamp, a medium-pressure mercury lamp, an electrodeless mercury lamp, a xenon flash lamp, an excimer lamp, an ultraviolet LED, or the like can be used.
- Step (D) the primary mounting semiconductor device 10 with the thermosetting resin layer 2 is electrically connected to the wiring board 23 via the protruding electrodes 4 (see FIG. 2F).
- the first main surface 3 a of the primary mounting semiconductor device 10 is fixed to the wiring board 23 according to a conventional method in a form facing the wiring board 23.
- the protruding electrode 4 formed on the primary mounting semiconductor device 10 is brought into contact with a bonding conductive material (not shown) attached to the connection pad of the wiring substrate 23 and is melted while being pressed.
- electrical connection between the primary mounting semiconductor device 10 and the wiring board 23 can be secured.
- thermosetting resin layer 2 is attached to the first main surface 3 a side of the primary mounting semiconductor device 10, the electrical connection between the protruding electrode 4 and the wiring substrate 23 is reinforced while reinforcing the base portion of the protruding electrode 4. Connection can be achieved.
- the general heating condition in the secondary mounting process is 200 to 300 ° C.
- the pressurizing condition is 0 to 1000 N.
- thermocompression treatment in multiple stages, the resin between the bump electrode 4 and the pad can be efficiently removed, and a better metal-to-metal bond can be obtained.
- Examples of the wiring board 23 include known wiring boards such as a rigid wiring board, a flexible wiring board, a ceramic wiring board, a metal core wiring board, and an organic substrate.
- the protruding electrode 4 and the conductive material are melted and connected to each other.
- the temperature at the time of melting of the protruding electrode 4 and the conductive material is usually 260 ° C. It is about (for example, 250 ° C. to 300 ° C.).
- the reinforcing sheet according to the present embodiment can have heat resistance that can withstand high temperatures in the mounting process by forming the thermosetting resin layer 2 with an epoxy resin or the like.
- the thermosetting resin layer 2 may be cured by applying heat at the time of secondary mounting, or may be cured by providing a curing process after the secondary mounting process.
- the heating temperature in the curing step is not particularly limited as long as the thermosetting resin layer 2 is cured, and may be about 100 to 300 ° C.
- the primary mounting semiconductor device 10 and the wiring substrate 23 include the protruding electrode 4 formed on the primary mounting semiconductor device 10 and a conductive material (not shown) provided on the wiring substrate 23. ). Moreover, since the thermosetting resin layer 2 is disposed at the base portion of the protruding electrode 4 so as to reinforce the portion, excellent impact resistance can be exhibited.
- the primary mounting semiconductor device used in this embodiment has a target thickness, the grinding step is omitted. Therefore, a reinforcing sheet provided with a dicing tape and a thermosetting resin layer laminated on the dicing tape is used as the reinforcing sheet in the second embodiment.
- a predetermined reinforcing sheet is bonded to the first main surface 3 a of the primary mounting semiconductor device 10.
- the reinforcing sheet includes a dicing tape 21 and a thermosetting resin layer 2 laminated on the dicing tape 21 (see FIG. 3A).
- the dicing tape 21 includes a base material layer 21a and an adhesive layer 21b laminated on the base material layer 21a.
- the thermosetting resin layer 2 is laminated
- the base material layer 21a and the pressure-sensitive adhesive layer 21b of the dicing tape 21 and the thermosetting resin layer 2 Similar ones can be used.
- the primary mounting semiconductor device and the bonding conditions the same ones as in the first embodiment can be adopted.
- Step (B) In the step (B), dicing processing is performed on the primary mounting semiconductor device 10 while being held by the reinforcing sheet.
- the same dicing conditions as those in the first embodiment can be preferably used.
- the secondary mounted semiconductor device can be manufactured by performing the step (D) after picking up the separated primary mounted semiconductor device 10.
- the configuration including the base material layer, the pressure-sensitive adhesive layer, and the thermosetting resin layer has been described as the configuration of the reinforcing sheet.
- heat is applied between the base material layer and the pressure-sensitive adhesive layer.
- a reinforcing sheet further including an intermediate layer made of a plastic resin will be described. Except for the point that the reinforcing sheet includes an intermediate layer, a predetermined semiconductor device can be manufactured through the same steps as those in the first embodiment.
- the reinforcing sheet 38 includes a base material layer 31a, an intermediate layer 31c, an adhesive layer 31b, and a thermosetting resin layer 2 in this order.
- the size of the protruding electrode is increased, it is necessary to increase the thickness of the thermosetting resin layer and the pressure-sensitive adhesive layer in order for the protruding electrode to enter when the reinforcing sheet is bonded.
- the intermediate layer 31c made of a thermoplastic resin as in this embodiment, the protruding electrode 4 can easily enter the intermediate layer 31c softened by heating at the time of bonding. The necessity of changing the thickness of the adhesive resin layer 2 and the pressure-sensitive adhesive layer 31b can be eliminated.
- a preferable example of the material for forming the intermediate layer 31c is a thermoplastic resin that softens at the bonding temperature in the step (A).
- a thermoplastic resin include acrylic resin, polyester, polyolefin, polyimide, polyamideimide, polysiloxane, polyether, polystyrene, polysulfide, and polycarbonate.
- acrylic resin is preferable from the viewpoint of heat resistance, hygroscopicity, and glass transition temperature.
- a package in which a semiconductor chip is flip-chip mounted on an interposer is used as a primary mounting semiconductor device.
- a wafer level chip size package (WS-CSP, hereinafter). , Also referred to as “CSP”).
- FIG. 5 shows the secondary mounting semiconductor device 40 in which the CSP is secondarily mounted on the wiring board 43.
- the CSP is provided at the tip of the chip 45, the conductive pillar 49 and the rewiring layer 46 formed on one side of the chip 45, the sealing resin layer 47 laminated on the rewiring layer 46, and the conductive pillar 49.
- the thermosetting resin layer 42 is further laminated on the sealing resin layer 47 of the CSP to reinforce the base portion of the protruding electrode.
- the secondary mounting semiconductor device 40 can be preferably manufactured through the steps described in the first embodiment except that the CSP is used as the primary mounting semiconductor device.
- the resin composition solution was applied as a release liner (separator) on a release treatment film made of a polyethylene terephthalate film having a thickness of 50 ⁇ m, and then dried at 130 ° C. for 2 minutes.
- a thermosetting resin layer having a thickness of 30 ⁇ m was prepared.
- the pressure-sensitive adhesive composition solution A was applied on a silicone-treated surface of a polyethylene terephthalate (PET) release liner and dried by heating at 120 ° C. for 2 minutes to form a pressure-sensitive adhesive layer having a thickness of 50 ⁇ m. Subsequently, it was bonded to a PET base material not subjected to silicone treatment on the formed pressure-sensitive adhesive layer.
- PET polyethylene terephthalate
- thermosetting resin layer of the reinforcing sheet is bonded to the bump forming surface of the wafer using a bonding apparatus (DR-3000II, manufactured by Nitto Seiki Co., Ltd.).
- DR-3000II manufactured by Nitto Seiki Co., Ltd.
- a wafer with a reinforcing sheet was produced.
- FC150JY_LF Bump height 70 ⁇ m
- Example 2 In the production of the pressure-sensitive adhesive layer, a reinforcing sheet and a wafer with a reinforcing sheet were produced in the same manner as in Example 1 except that the blending amount of the polyisocyanate compound was 0.5 part with respect to 100 parts of the acrylic polymer A ′.
- Example 3 In the production of the pressure-sensitive adhesive layer, a reinforcing sheet and a wafer with a reinforcing sheet were produced in the same manner as in Example 1 except that the blending amount of the polyisocyanate compound was 0.2 parts with respect to 100 parts of the acrylic polymer A ′.
- Example 4 In the production of the pressure-sensitive adhesive layer, a reinforcing sheet and a wafer with a reinforcing sheet were produced in the same manner as in Example 1 except that the blending amount of the polyisocyanate compound was 0.1 part with respect to 100 parts of the acrylic polymer A ′.
- melt viscosity of adhesive layer The melt viscosity of the pressure-sensitive adhesive layer (before UV curing) produced by the above procedure was measured.
- the melt viscosity is a value measured by a parallel plate method using a rheometer (manufactured by HAAKE, RS-1). More specifically, the melt viscosity was measured in the range of 50 ° C. to 120 ° C. under the conditions of a gap of 100 ⁇ m, a rotating plate diameter of 20 mm, a rotating speed of 10 s ⁇ 1 , and a heating rate of 10 ° C./min.
- the temperature was 4000 Pa ⁇ s or less in the entire temperature range.
- Comparative Example 1 there was a stage exceeding 4000 Pa ⁇ s in the above temperature range.
- Table 1 shows the measurement results of the melt viscosity at 80 ° C. in the above temperature range.
- the resin residue on the bumps observed with an optical microscope is developed on a diamond cell, and transmitted using a micro FT-IR (Thermo Fisher Scientific, “Nicolet 8700”), resolution 4.0 cm ⁇ 1 , accumulation number 512 times. Infrared spectrum was measured. When a peak derived from a silica filler was observed at 1100 cm ⁇ 1 , a case where the resin residue was not observed was identified as being derived from a pressure-sensitive adhesive layer, respectively. The results are shown in Table 1.
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Abstract
Description
基材層、粘着剤層及び熱硬化性樹脂層をこの順で備え、
前記粘着剤層の破断強度が0.07MPa以上であり、かつ60~100℃における溶融粘度が4000Pa・s以下である。
(A)前記一次実装半導体装置の第1主面に当該補強シートを貼り合わせる工程、
(B)前記補強シートによる保持下において前記一次実装半導体装置に対する加工を行う工程、
(C)前記補強シートにおける前記熱硬化性樹脂層と前記粘着剤層とを剥離して前記熱硬化性樹脂層付きの一次実装半導体装置を得る工程、及び
(D)前記熱硬化性樹脂層付きの一次実装半導体装置を配線基板に前記突起電極を介して電気的に接続する工程
を含む二次実装半導体装置の製造方法も含まれる。
第1実施形態では、一次実装半導体装置として半導体チップがインターポーザーにフリップチップ実装されたパッケージを用い、一次実装半導体装置の加工として裏面研削を行う態様について説明する。
工程(A)では、一次実装半導体装置の第1主面に所定の補強シートを貼り合わせる。以下では、まず補強シートについて説明し、その後、該補強シートを利用する二次実装半導体装置の製造工程について説明する。
図1に示すように、補強シート8は、基材層1a、粘着剤層1b及び熱硬化性樹脂層2をこの順で備える。本実施形態では、基材層1a及び粘着剤層1bが裏面研削用テープ1を構成している。なお、熱硬化性樹脂層2は、図1に示したように、一次実装半導体装置10(図2A参照)の樹脂封止集合体との貼り合わせに十分なサイズで設けられていればよく、裏面研削用テープ1の全面に積層されていてもよい。
裏面研削用テープ1は、基材層1aと、基材層1a上に積層された粘着剤層1bとを備えている。なお、熱硬化性樹脂層2は、粘着剤層1b上に積層されている。
上記基材層1aは補強シート8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。粘着剤層1bが紫外線硬化型である場合、基材層1aは紫外線に対し透過性を有するものが好ましい。
粘着剤層1bの破断強度は0.07MPa以上であればよいが、好ましくは0.08MPa以上であり、より好ましくは0.1MPa以上である。粘着剤層1bの破断強度を0.07MPa以上としているので、一次実装半導体装置の裏面研削用テープからの剥離の際にも粘着剤層の破断を抑制することができ、突起電極や熱硬化性樹脂層への糊残りを防止することができる。破断強度の上限値は特に限定されないものの、バンプの凹凸への追従性の観点から、2.0MPa以下が好ましく、1.0MPa以下がより好ましい。なお、粘着剤層1bが放射線硬化型の粘着剤層(後述)である場合は、硬化後の破断強度が上記範囲を満たせばよい。
本実施形態における熱硬化性樹脂層2は、表面二次実装された一次実装半導体装置の突起電極の一次実装基板側の根元部分を補強する補強用フィルムとして好適に用いることができる。
本実施の形態に係る補強シート8は、例えば裏面研削用テープ1及び熱硬化性樹脂層2を別々に作製しておき、最後にこれらを貼り合わせることにより作成することができる。具体的には、以下のような手順に従って作製することができる。
図2Aに示すように、本実施形態に係る一次実装半導体装置10は、第1主面3aに突起電極4が形成された半導体装置であればよい。例えば、半導体チップ又は半導体素子5が、いわゆるインターポーザー又は基板3を介して、突起電極4(ハンダボール、ハンダバンプ、導電性ボールなどともいう。)と接続された形態の半導体装置を指し、通常は、封止樹脂6により封止されてパッケージを構成している。従って、厳密には、図2Aに示されているのは複数の一次実装半導体装置が樹脂封止された封止集合体ということになるが、本明細書では両者を区別せずに一次実装半導体装置ということがある。また、マルチ・チップ・モジュール(MCM)やチップ・サイズ・パッケージ(CSP)、ボール・グリッド・アレイ(BGA)等も一次実装半導体装置に含まれる。
図2Aに示すように、一次実装半導体装置10の突起電極4が形成された第1主面3aに、補強シート8を貼り合わせる。貼り合わせは、汎用性および生産性の観点から加熱加圧条件下で行うことが好ましく、ロール圧着又はプレス圧着方式等が好適に用いられる。
工程(B)では、補強シート8による保持下において一次実装半導体装置10に対する裏面研削加工を行う。研削工程では、上記一次実装半導体装置10の第1主面3aとは反対側の第2主面(すなわち、裏面)3b側から研削を行う(図2B参照)。なお、本実施形態では封止樹脂6のみの研削を行っているが、これにとどまらず、半導体チップ5の裏面を研削するようにしてもよい。半導体チップ5の裏面が樹脂封止されていない場合は、そのまま半導体チップ5の裏面を研削することになる。一次実装半導体装置10の裏面研削に用いる薄型加工機としては特に限定されず、例えば研削機(バックグラインダー)、研磨パッド等を例示できる。また、エッチング等の化学的方法にて裏面研削を行ってもよい。裏面研削は、一次実装半導体装置が所望の厚さ(例えば、10~500μm)になるまで行われる。
研削工程後、熱硬化性樹脂層2を貼り付けた状態で一次実装半導体装置10を裏面研削用テープ1から剥離し(図2C)、熱硬化性樹脂層2付き一次実装半導体装置10とダイシングテープ11とを貼り合わせる(図2D参照)。このとき、一次実装半導体装置の第2主面3b側とダイシングテープ11の粘着剤層11bとが対向するように貼り合わせる。従って、一次実装半導体装置10の第1主面3aに貼り合わされた熱硬化性樹脂層2は露出した状態(図2D中、上向き)となる。なお、ダイシングテープ11は、基材層11a上に粘着剤層11bが積層された構造を有する。基材層11a及び粘着剤層11bとしては、上記裏面研削用テープ1の基材層1a及び粘着剤層1bの項で示した成分及び製法を用いて好適に作製することができる。また、市販のダイシングテープも好適に用いることができる。
ダイシング工程では、図2Eに示すように一次実装半導体装置10及び熱硬化性樹脂層2をダイシングして個片化された熱硬化性樹脂層2付きの一次実装半導体装置10を形成する。ここで得られる一次実装半導体装置10は同形状に切断された熱硬化性樹脂層2と一体になっている。ダイシングは、一次実装半導体装置10の熱硬化性樹脂層2を貼り合わせた第1主面3a側から常法に従い行われる。
工程(D)では、熱硬化性樹脂層2付きの一次実装半導体装置10を配線基板23に突起電極4を介して電気的に接続する(図2F参照)。具体的には、一次実装半導体装置10の第1主面3aが配線基板23と対向する形態で、配線基板23に常法に従い固定させる。例えば、一次実装半導体装置10に形成されている突起電極4を、配線基板23の接続パッドに被着された接合用の導電材(図示せず)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、一次実装半導体装置10と配線基板23との電気的接続を確保することができる。一次実装半導体装置10の第1主面3a側には熱硬化性樹脂層2が貼り付けられているので、突起電極4の根元部分を補強しつつ、突起電極4と配線基板23との電気的接続を図ることができる。
次に、当該補強シートを用いて得られる二次実装半導体装置について図面を参照しつつ説明する(図2F参照)。本実施形態に係る半導体装置20では、一次実装半導体装置10と配線基板23とが、一次実装半導体装置10上に形成された突起電極4及び配線基板23上に設けられた導電材(図示せず)を介して電気的に接続されている。また、突起電極4の根元部分には、当該部分を補強するように熱硬化性樹脂層2が配置されていることから、優れた耐衝撃性を発揮することができる。
本実施形態で用いる一次実装半導体装置は目的とする厚さを有していることから、研削工程は省略される。従って、第2実施形態での補強シートとしては、ダイシングテープと該ダイシングテープ上に積層された熱硬化性樹脂層とを備える補強シートを用いる。
工程(A)では、一次実装半導体装置10の第1主面3aに所定の補強シートを貼り合わせる。補強シートは、ダイシングテープ21と該ダイシングテープ21上に積層された熱硬化性樹脂層2とを備える(図3A参照)。ダイシングテープ21は、基材層21aと、基材層21a上に積層された粘着剤層21bとを備えている。なお、熱硬化性樹脂層2は、粘着剤層21b上に積層されている。このようなダイシングテープ21の基材層21a及び粘着剤層21b、並びに熱硬化性樹脂層2としては、第1実施形態における基材層1a及び粘着剤層1b、並びに熱硬化性樹脂層2と同様のものを用いることができる。一次実装半導体装置や貼り合わせ条件等は、第1実施形態と同様のものを採用することができる。
工程(B)では、補強シートによる保持下において一次実装半導体装置10に対するダイシング加工を行う。ダイシング条件等は第1実施形態と同様のものを好適に採用することができる。
第1実施形態では補強シートの構成として、基材層、粘着剤層及び熱硬化性樹脂層を備える態様を説明したが、第3実施形態では、基材層と粘着剤層との間に熱可塑性樹脂からなる中間層をさらに備える補強シートについて説明する。補強シートが中間層を備える点を除けば、第1実施形態と同様の工程を経ることで所定の半導体装置を製造することができる。
第1実施形態では、一次実装半導体装置として、半導体チップがインターポーザーにフリップチップ実装されたパッケージを用いたが、第4実施形態では、ウェハ・レベル・チップ・サイズ・パッケージ(WS-CSP。以下、「CSP」ともいう。)を用いる。
(熱硬化性樹脂層の作製)
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):100部に対して、エポキシ樹脂1(商品名「エピコート1004」JER株式会社製):23部、エポキシ樹脂2(商品名「エピコート828」JER株式会社製):209部、フェノール樹脂(商品名「ミレックスXLC-4L」三井化学株式会社製):215部、球状シリカ(商品名「YC100C-MLC」株式会社アドマテックス製):370部、有機酸(商品名「オルトアニス酸」東京化成株式会社製):5.4部、イミダゾール触媒(商品名「2PHZ-PW」四国化成株式会社製):2.7部をメチルエチルケトンに溶解して、固形分濃度が23.6重量%となる樹脂組成物の溶液を調製した。
冷却管、窒素導入管、温度計、及び、撹拌装置を備えた反応容器に、アクリル酸-2-エチルヘキシル(以下、「2EHA」ともいう。)86.4部、アクリル酸-2-ヒドロキシエチル(以下、「HEA」ともいう。)13.6部、過酸化ベンゾイル0.2部、及び、トルエン65部を入れ、窒素気流中で61℃にて6時間重合処理をし、アクリル系ポリマーAを得た。
粘着剤層上の剥離ライナーを剥離した後、得られた粘着剤層と熱硬化性樹脂層とを40℃でハンドローラで貼りわせることにより補強シートを作製した。
熱硬化性樹脂層上の剥離ライナーを剥離した後、貼り合わせ装置(DR-3000II、日東精機(株)製)を用い、補強シートの熱硬化性樹脂層をウェハのバンプ形成面へ貼り合わせて補強シート付きウェハを作製した。
<貼り合わせ条件>
温度:80℃
速度:3mm/s
圧力:100%(0.5MPa)
<評価ウェハ>
株式会社ウォルツ社製
FC150JY_LF
バンプ高さ:70μm
粘着剤層の作製において、ポリイソシアネート化合物の配合量をアクリル系ポリマーA’100部に対し0.5部としたこと以外は、実施例1と同様に補強シート及び補強シート付きウェハを作製した。
粘着剤層の作製において、ポリイソシアネート化合物の配合量をアクリル系ポリマーA’100部に対し0.2部としたこと以外は、実施例1と同様に補強シート及び補強シート付きウェハを作製した。
粘着剤層の作製において、ポリイソシアネート化合物の配合量をアクリル系ポリマーA’100部に対し0.1部としたこと以外は、実施例1と同様に補強シート及び補強シート付きウェハを作製した。
粘着剤層の作製において、ポリイソシアネート化合物の配合量をアクリル系ポリマーA’100部に対し2部としたこと以外は、実施例1と同様に補強シート及び補強シート付きウェハを作製した。
粘着剤層の作製において、ポリイソシアネート化合物を配合しなかったこと以外は、実施例1と同様に補強シート及び補強シート付きウェハを作製した。
(粘着剤層の破断強度の測定)
上記手順にて作製した粘着剤層に300mJ/cm2のUV光を照射して粘着剤層を硬化させ、硬化後の粘着剤層を幅30mm×長さ10mmに切断して試験片とした。試験片を引張試験機「オートグラフASG-50D型」(島津製作所製)にセットし、引張速度300mm/min、チャック間距離10mm、室温(23℃)で引張試験を行い、応力-歪み曲線を求めた。その際の試験片が破断した時の応力を求めて破断強度とした。結果を表1に示す。
上記手順にて作製した粘着剤層(UV硬化前)の溶融粘度を測定した。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10s-1、昇温速度10℃/分の条件にて、50℃から120℃の範囲で溶融粘度を測定した。その結果、実施例1~4及び比較例2では上記温度範囲の全てで4000Pa・s以下であった。一方、比較例1では上記温度範囲で4000Pa・sを超える段階があった。表1には、上記温度範囲のうち80℃における溶融粘度の測定結果を示す。
上記手順にて作製した補強シート付きウェハのPET基材側から300mJ/cm2のUV光を照射して粘着剤層を硬化させ、その後、粘着剤層を基材とともに熱硬化性樹脂層から剥離した。その際のバンプを光学顕微鏡(500倍)で観察することにより、バンプへの補強シートの何らかの樹脂成分の移行(樹脂残渣)の有無を観察した。また、バンプに移行した樹脂残渣の同定を顕微FT-IRを用い以下の手順にて行った。光学顕微鏡で観察されたバンプ上の樹脂残渣をダイヤモンドセル上に展開し、顕微FT-IR(Thermo Fisher Scientific、「Nicolet 8700」)を用いて透過法、分解能4.0cm-1、積算回数512回にて赤外スペクトルを測定した。1100cm-1においてシリカフィラー由来のピークが観察された場合、樹脂残渣が熱硬化性樹脂層由来であると、観察されなかった場合を粘着剤層由来とそれぞれ同定した。結果を表1に示す。
1a、21a、31a 基材層
1b、21b、31b 粘着剤層
2 熱硬化性樹脂層
3 インターポーザー
3a インターポーザーの第1主面
3b インターポーザーの第1主面とは反対側の第2主面
4、44 突起電極
5、45 半導体チップ(半導体素子)
6、46 封止樹脂
8、38 補強シート
11、21 ダイシングテープ
10 一次実装半導体装置
20、40 二次実装半導体装置
31c 中間層
Claims (7)
- 第1主面に突起電極が形成された一次実装半導体装置が、該突起電極を介して配線基板に電気的に接続された二次実装半導体装置を補強するための補強シートであって、
基材層、粘着剤層及び熱硬化性樹脂層をこの順で備え、
前記粘着剤層の破断強度が0.07MPa以上であり、かつ60~100℃における溶融粘度が4000Pa・s以下である補強シート。 - 前記熱硬化性樹脂層の厚さは、前記突起電極の高さの50%以下である請求項1に記載の補強シート。
- 前記熱硬化性樹脂層と前記粘着剤層との間の剥離力が0.02N/20mm以上0.3N/20mm以下である請求項1又は2に記載の補強シート。
- 前記基材層と前記粘着剤層との間に熱可塑性樹脂からなる中間層をさらに備える請求項1~3のいずれか1項に記載の補強シート。
- 第1主面に突起電極が形成された一次実装半導体装置が、該突起電極を介して配線基板に電気的に接続された二次実装半導体装置の製造方法であって、
(A)前記一次実装半導体装置の第1主面に請求項1~4のいずれか1項に記載の補強シートを貼り合わせる工程、
(B)前記補強シートによる保持下において前記一次実装半導体装置に対する加工を行う工程、
(C)前記補強シートにおける前記熱硬化性樹脂層と前記粘着剤層とを剥離して前記熱硬化性樹脂層付きの一次実装半導体装置を得る工程、及び
(D)前記熱硬化性樹脂層付きの一次実装半導体装置を配線基板に前記突起電極を介して電気的に接続する工程
を含む二次実装半導体装置の製造方法。 - 工程(A)において、前記補強シートを前記突起電極が前記粘着剤層に到達するように貼り合わせる請求項5に記載の二次実装半導体装置の製造方法。
- 前記粘着剤層が放射線硬化型粘着剤層であり、
該放射線硬化型粘着剤層に放射線を照射した後に工程(C)を行う請求項5又は6に記載の二次実装半導体装置の製造方法。
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2013
- 2013-03-13 JP JP2013050794A patent/JP5976573B2/ja active Active
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2014
- 2014-03-12 CN CN201480013601.4A patent/CN105051890B/zh not_active Expired - Fee Related
- 2014-03-12 WO PCT/JP2014/056441 patent/WO2014142154A1/ja not_active Ceased
- 2014-03-12 KR KR1020157019820A patent/KR20150130973A/ko not_active Withdrawn
- 2014-03-12 US US14/775,445 patent/US9472439B2/en not_active Expired - Fee Related
- 2014-03-13 TW TW103109164A patent/TWI642120B/zh not_active IP Right Cessation
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| JP2005028734A (ja) * | 2003-07-11 | 2005-02-03 | Nitto Denko Corp | 積層シート |
| WO2006118033A1 (ja) * | 2005-04-27 | 2006-11-09 | Lintec Corporation | シート状アンダーフィル材および半導体装置の製造方法 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017077809A1 (ja) * | 2015-11-04 | 2017-05-11 | リンテック株式会社 | 半導体装置の製造方法 |
| WO2017077957A1 (ja) * | 2015-11-04 | 2017-05-11 | リンテック株式会社 | 半導体装置の製造方法 |
| WO2017077958A1 (ja) * | 2015-11-04 | 2017-05-11 | リンテック株式会社 | 半導体装置の製造方法 |
| JPWO2017077958A1 (ja) * | 2015-11-04 | 2018-08-23 | リンテック株式会社 | 半導体装置の製造方法 |
| JPWO2017077809A1 (ja) * | 2015-11-04 | 2018-09-13 | リンテック株式会社 | 半導体装置の製造方法 |
| JP2018107425A (ja) * | 2016-12-26 | 2018-07-05 | リンテック株式会社 | ワークの製造方法 |
| WO2025203822A1 (ja) * | 2024-03-25 | 2025-10-02 | 三井化学Ictマテリア株式会社 | 電子装置の製造方法および粘着性フィルム |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5976573B2 (ja) | 2016-08-23 |
| US20160042986A1 (en) | 2016-02-11 |
| US9472439B2 (en) | 2016-10-18 |
| TW201448066A (zh) | 2014-12-16 |
| KR20150130973A (ko) | 2015-11-24 |
| TWI642120B (zh) | 2018-11-21 |
| CN105051890A (zh) | 2015-11-11 |
| JP2014179377A (ja) | 2014-09-25 |
| CN105051890B (zh) | 2018-11-02 |
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