WO2009150985A1 - 半導体素子搭載基板 - Google Patents
半導体素子搭載基板 Download PDFInfo
- Publication number
- WO2009150985A1 WO2009150985A1 PCT/JP2009/060194 JP2009060194W WO2009150985A1 WO 2009150985 A1 WO2009150985 A1 WO 2009150985A1 JP 2009060194 W JP2009060194 W JP 2009060194W WO 2009150985 A1 WO2009150985 A1 WO 2009150985A1
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- WIPO (PCT)
- Prior art keywords
- semiconductor element
- layer
- mounting substrate
- element mounting
- resin
- Prior art date
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Definitions
- the present invention relates to a semiconductor element mounting substrate.
- Electronic devices are equipped with substrates to which semiconductor elements such as IC chips and capacitors are connected.
- the structure is asymmetrical in the vertical direction, and the physical properties are also asymmetrical, so that the substrate is warped and the reliability of the semiconductor element mounting substrate is increased. There was a problem that the performance would be lowered.
- An object of the present invention is to provide a semiconductor element mounting substrate capable of preventing the occurrence of warpage and preventing peeling of a built-in semiconductor element from the substrate.
- Such an object is achieved by the present inventions (1) to (20) below.
- a substrate A semiconductor element mounted on one side of the substrate; An adhesive layer for bonding the substrate and the semiconductor element; A first layer embedding the semiconductor element; A second layer provided on the opposite side of the substrate from the first layer; Having at least one surface layer provided on the first layer and on the second layer;
- the storage elastic modulus of the adhesive layer at 25 ° C. is 5 to 1000 MPa, Of the surface layer, 20 ° C. or higher, the thermal expansion coefficient in the planar direction is measured based on JIS C 6481 at JIS C 6481 glass transition point of the surface layer is measured according to Tg a [° C.] or less, A semiconductor element mounting substrate characterized by being 40 ppm / ° C. or less.
- the adhesive layer is composed of an adhesive, Any of the above (1) to (4), wherein the adhesive is composed of a resin composition containing a (meth) acrylic acid ester copolymer, an epoxy resin, a phenol resin, and an inorganic filler.
- JIS C 6481 glass transition temperature Tg a of the surface layer is measured according to the semiconductor element mounting board according to any one of (1) in the range of 100 ⁇ 300 ° C. (12) .
- the resin material further includes an epoxy resin,
- the content of the cyanate resin in the resin material is C [wt%] and the content of the epoxy resin in the resin material is D [wt%], 0.5 ⁇ D / C ⁇ 4
- the semiconductor element mounting substrate according to any one of (18).
- the resin material further includes a phenoxy resin,
- the content of the cyanate resin in the resin material is C [wt%] and the content of the phenoxy resin in the resin material is E [wt%], 0.2 ⁇ E / C ⁇ 2
- the semiconductor element mounting substrate according to any one of (19).
- FIG. 1 is a longitudinal sectional view showing a preferred embodiment of a semiconductor element mounting substrate of the present invention.
- the upper side in FIG. 1 is referred to as “upper” or “upper”.
- a semiconductor element mounting substrate 10 includes a core substrate (substrate) 1, a semiconductor element 2 mounted on the upper side of the core substrate 1, and an adhesive film that joins the semiconductor element 2 onto the core substrate 1.
- (Adhesive layer) 3 first layer 4 formed to embed semiconductor element 2, second layer 5 formed below core substrate 1, first layer 4 and second layer And a surface layer 6 formed on the surface of the layer 5.
- wiring patterns are formed on the core substrate 1, the first layer 4, the second layer 5, and the surface layer 6, respectively, and are configured to be electrically connected to each other. .
- the semiconductor element 2 is electrically connected to the wiring pattern on the surface layer 6.
- the core substrate 1 has a function of supporting the mounted semiconductor element 2.
- the core substrate 1 is made of a material having high insulation and high rigidity (Young's modulus).
- the core substrate 1 may be composed of any material as long as it has the above characteristics, but is mainly composed of a fiber base material, a resin material, and an inorganic filler. preferable.
- the fiber substrate examples include glass fiber substrates such as glass woven fabric and glass nonwoven fabric, polyamide resin fibers, aromatic polyamide resin fibers, polyamide resin fibers such as wholly aromatic polyamide resin fibers, polyester resin fibers, and aromatics.
- a glass fiber base material is preferable. Thereby, the rigidity of the core board
- Examples of the glass constituting such a glass fiber substrate include E glass, C glass, A glass, S glass, D glass, NE glass, T glass, and H glass.
- T glass is preferable.
- the thermal expansion coefficient of a glass fiber base material can be made small, and, thereby, the thermal expansion coefficient of the core board
- substrate 1 can be made smaller.
- the content of the fiber base material in the core substrate 1 is preferably 30 to 70% by weight, and more preferably 40 to 60% by weight. Thereby, the thermal expansion coefficient of the core substrate 1 can be reduced more effectively.
- the resin material constituting the core substrate 1 is not particularly limited as long as it has insulating properties.
- the content of the resin material in the core substrate 1 is preferably 15 to 40% by weight, and more preferably 20 to 35% by weight. Thereby, the rigidity of the core substrate 1 can be made more effective.
- examples of the inorganic filler include talc, alumina, glass, silica, mica, aluminum hydroxide, magnesium hydroxide, and the like.
- the content of the inorganic filler in the core substrate 1 is preferably 12 to 35% by weight, and more preferably 18 to 30% by weight. Thereby, the rigidity of the core substrate 1 can be made more effective.
- the Young's modulus at 25 ° C. of the core substrate 1 is preferably 20 to 50 GPa, more preferably 25 to 40 GPa. Thereby, generation
- the Young's modulus at 250 ° C. of the core substrate 1 is preferably 10 to 45 GPa, more preferably 13 to 35 GPa.
- the core substrate 1, 20 ° C. or more, in the surface direction is measured based on JIS C 6481 in JIS C 6481 to the glass transition temperature Tg c [° C.] of the core substrate 1 which is measured in accordance less heat
- the expansion coefficient is preferably 13 ppm / ° C. or less, and more preferably 3 to 11 ppm / ° C.
- the average thickness of the core substrate 1 is preferably 25 to 800 ⁇ m, and more preferably 40 to 200 ⁇ m.
- semiconductor element 2 As shown in FIG. 1, the semiconductor element 2 is bonded to the core substrate 1 via an adhesive layer 3 as will be described later.
- Examples of the semiconductor element 2 include an IC chip, a capacitor, a diode, a transistor, and a thyristor.
- the area of the semiconductor element 2 when the semiconductor element 2 is viewed in plan is preferably 6 to 10. 7 to 9 is more preferable. Thereby, generation
- the area of the semiconductor elements refers to the sum of the areas of the semiconductor elements when viewed in plan.
- the volume of the semiconductor element 2 is preferably 2 to 7, and more preferably 3 to 6. Thereby, generation
- the volume of the semiconductor elements refers to the total volume of the semiconductor elements.
- the adhesive film (adhesive layer) 3 has a function of adhering the semiconductor element 2 as described above onto the core substrate 1.
- the semiconductor element mounting substrate of the present invention is characterized in that the adhesive elastic layer has a storage elastic modulus at 25 ° C. of 5 to 1000 MPa.
- the adhesive elastic layer has a storage elastic modulus at 25 ° C. of 5 to 1000 MPa.
- the storage elastic modulus at 25 ° C. of the adhesive layer is 5 to 1000 MPa, more preferably 8 to 700 MPa, and further preferably 100 to 700 MPa. Thereby, the effect of this invention can be made more remarkable.
- the adhesive film 3 is a flexible member and is mainly composed of an adhesive.
- Resin containing a (meth) acrylic acid ester copolymer, an epoxy resin, a phenol resin, and an inorganic filler it is preferable that it is comprised with a composition.
- a (meth) acrylic acid ester copolymer is a copolymer of a (meth) acrylic acid ester and another monomer, and is a (meth) acrylic resin mainly composed of acrylic acid and its derivatives. Preferably there is.
- (meth) acrylic acid esters examples include acrylic acid esters such as methyl acrylate and ethyl acrylate, and methacrylic acid esters such as methyl methacrylate and ethyl methacrylate. Moreover, acrylic acid, methacrylic acid, acrylonitrile, acrylamide etc. are mentioned as another monomer.
- the (meth) acrylic acid ester copolymer is preferably an acrylic acid copolymer having a compound having an epoxy group, a hydroxyl group, a carboxyl group, a nitrile group, or the like.
- the adhesiveness of the semiconductor element 2 to the core substrate 1 can be further improved.
- Specific examples of the compound having such a functional group include glycidyl methacrylate having a glycidyl ether group, hydroxy methacrylate having a hydroxyl group, carboxy methacrylate having a carboxyl group, and acrylonitrile having a nitrile group.
- the content of the compound having a carboxyl group is, for example, preferably 0.5% by weight or more of the entire (meth) acrylic acid ester copolymer. % Or more is more preferable.
- the content of the compound having a carboxyl group is preferably 10% by weight or less of the entire (meth) acrylic acid ester copolymer, for example, from the viewpoint of further improving the storage stability of the adhesive film 3. More preferably, it is not more than% by weight.
- the weight average molecular weight of the (meth) acrylic acid ester copolymer is preferably 100,000 or more, more preferably 150,000 to 1,000,000.
- the glass transition point of the (meth) acrylic acid ester copolymer is preferably 0 ° C. or higher, for example, from the viewpoint of further improving workability by suppressing the adhesion of the adhesive film 3 from becoming too strong. The above is more preferable. Further, the glass transition point of the (meth) acrylic acid ester copolymer is preferably, for example, 30 ° C. or less, and more preferably 20 ° C. or less, from the viewpoint of further improving the adhesiveness at low temperatures.
- the epoxy resin refers to any of a monomer, an oligomer and a polymer.
- Specific examples of epoxy resins include novolak epoxy resins such as phenol novolac epoxy resins and cresol novolac epoxy resins; bisphenol epoxy resins such as bisphenol A epoxy resins and bisphenol F epoxy resins; hydroquinone epoxy resins; biphenyl types Epoxy resin; stilbene type epoxy resin; triphenolmethane type epoxy resin; triazine nucleus-containing epoxy resin; dicyclopentadiene modified phenol type epoxy resin; naphthol type epoxy resin and phenol aralkyl type epoxy resin having phenylene and / or biphenylene skeleton Aralkyl-type epoxy resins such as naphthol aralkyl-type epoxy resins having a phenylene and / or biphenylene skeleton.
- novolac type epoxy resins bisphenol type epoxy resins, biphenyl type epoxy resins, naphthol type epoxy resins and the like are preferably used.
- a biphenyl type epoxy resin by using a biphenyl type epoxy resin, the glass transition point of the adhesive film 3 can be increased, and the elastic modulus of the adhesive film 3 can be made suitable.
- the glass transition temperature of the adhesive film 3 can be raised by using a naphthol type epoxy resin, and the adhesiveness of an adhesive surface can be improved.
- the softening point of the epoxy resin is not particularly limited as long as it has compatibility with the acrylic ester copolymer, but the tackiness of the adhesive film 3 is reduced, and the assembly process of the semiconductor element mounting substrate
- the temperature is preferably 40 ° C. or higher, and more preferably 50 ° C. or higher.
- the softening point of the epoxy resin is preferably set to 100 ° C. or less, for example, 90 ° C. or less. Is more preferable.
- the epoxy resin a plurality of components having different softening points may be used in combination.
- action which makes it easy to make compatible the effect which reduces the tackiness of the adhesive film 3, and the effect which suppresses the wettability fall at the time of thermocompression bonding.
- the combination of the epoxy resin whose softening point is 40 degreeC or more and less than 70 degreeC and the epoxy resin whose softening point is 70 degreeC or more and 100 degrees C or less is mentioned.
- the phenol resin refers to all monomers, oligomers and polymers having at least two phenolic hydroxyl groups capable of forming a crosslinked structure by curing reaction with the above epoxy resin.
- phenol resin examples include phenol novolak resin, cresol novolak resin, phenol aralkyl (including phenylene and biphenylene skeleton) resin, naphthol aralkyl resin, triphenolmethane resin, dicyclopentadiene type phenol resin, and the like. These may be used alone or in combination.
- the softening point of the phenol resin is, for example, preferably 80 ° C. or more and 90 ° C. or more from the viewpoint of further improving the heat resistance of the adhesive film 3 and further suppressing the generation of decomposition gas during thermocompression bonding. More preferably. Further, from the viewpoint of suppressing the increase in melt viscosity and the accompanying decrease in wettability during thermocompression bonding and further improving the adhesion, the softening point of the phenol resin is preferably set to 130 ° C. or less, for example, 120 ° C. or less. Is more preferable.
- the compounding quantity of the said (meth) acrylic acid ester copolymer in a resin composition is less than the sum total of the compounding quantity of the said epoxy resin, and the compounding quantity of the said phenol resin on a weight basis.
- content of the said epoxy resin among the said epoxy resin and the said phenol resin is a viewpoint which further reduces the thermal expansion coefficient of the adhesive film 3 with respect to 10 weight part of the said (meth) acrylic acid ester copolymers.
- the amount is preferably 10 parts by weight or more, and more preferably 20 parts by weight or more.
- the content of the epoxy resin is preferably 100 parts by weight or less, for example, from the viewpoint of further improving the toughness of the adhesive film 3 with respect to 10 parts by weight of the (meth) acrylic acid ester copolymer, and 50 weights. More preferably, it is less than or equal to parts.
- curing agent ie, a phenol resin
- the inorganic filler has a function of reducing the thermal expansion coefficient of the adhesive film 3.
- examples of the inorganic filler include silver, titanium oxide, silica, mica and the like. Among these, silica filler is preferable. By using a silica filler, the workability at the time of manufacturing the adhesive film 3 can be further improved. In the case of a silica filler, there are crushed silica and fused silica as shapes, but fused silica is preferred.
- the average particle diameter of the inorganic filler is, for example, preferably 0.01 ⁇ m or more, and more preferably 0.1 ⁇ m or more from the viewpoint of suppressing filler aggregation in the adhesive film 3 and improving the appearance. Further, the average particle diameter of the inorganic filler is preferably 20 ⁇ m or less, for example, from the viewpoint of further reliably suppressing the silica filler filler from the adhesive film 3 and destroying the chip during thermocompression bonding, More preferably, it is 5 ⁇ m or less.
- the content of the inorganic filler is not particularly limited, but is preferably 1 part by weight or more, and more preferably 10 parts by weight or more with respect to 100 parts by weight of the resin component excluding the inorganic filler.
- the content of the inorganic filler is preferably 200 parts by weight or less, and more preferably 100 parts by weight or less, with respect to 100 parts by weight of the resin component excluding the inorganic filler.
- the resin composition which comprises the adhesive film 3 may contain components other than the said component.
- the resin composition may contain a coupling agent.
- the adhesiveness between the resin in the adhesive film 3 and the adherend and the adhesiveness at the interface between the resin in the adhesive film 3 and silica can be further improved.
- Examples of the coupling agent include silane-based, titanium-based, and aluminum-based, among which silane-based coupling agents are preferable.
- silane coupling agent examples include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ -glycid.
- the amount of the coupling agent is, for example, preferably 0.01 parts by weight or more, and more preferably 0.1 parts by weight or more with respect to 100 parts by weight of the entire resin composition. More preferred. Further, from the viewpoint of suppressing the generation of cracked gas (outgas) and voids, the amount of coupling agent is preferably 10 parts by weight or less, for example, based on 100 parts by weight of the entire resin composition, and 5 parts by weight. The following is more preferable.
- the resin composition constituting the adhesive film 3 may contain a flux active compound having a carboxyl group and / or a phenolic hydroxyl group in addition to the above components.
- the flux active compound having a carboxyl group and / or a phenolic hydroxyl group refers to a compound having at least one carboxyl group and / or phenolic hydroxyl group in the molecule, and may be liquid or solid.
- Examples of the flux active compound containing a carboxyl group include aliphatic acid anhydrides, alicyclic acid anhydrides, aromatic acid anhydrides, aliphatic carboxylic acids, and aromatic carboxylic acids.
- Examples of the flux active compound having a phenolic hydroxyl group include phenols.
- aliphatic acid anhydride examples include succinic anhydride, polyadipic acid anhydride, polyazeline acid anhydride and polysebacic acid anhydride.
- Alicyclic acid anhydrides include methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylhymic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, trialkyltetrahydrophthalic anhydride, methylcyclohexene dicarboxylic acid anhydride Thing etc. are mentioned.
- aromatic acid anhydride examples include phthalic anhydride trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic acid anhydride, ethylene glycol bistrimellitate, glycerol tris trimellitate and the like.
- Examples of the aliphatic carboxylic acid include compounds having a structural formula represented by HOOC— (CH 2 ) n —COOH. Note that n is an integer from 0 to 20.
- n is preferably 3 or more and 10 or less from the balance of flux activity, outgas at the time of adhesion, and elastic modulus after curing of the adhesive tape and glass transition temperature.
- n is preferably 3 or more and 10 or less from the balance of flux activity, outgas at the time of adhesion, and elastic modulus after curing of the adhesive tape and glass transition temperature.
- aliphatic carboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid pivalate, caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, acrylic acid, methacrylic acid, crotonic acid, Examples include oleic acid, fumaric acid, maleic acid, oxalic acid, malonic acid, and oxalic acid.
- Aromatic carboxylic acids include benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, hemimellitic acid, trimellitic acid, trimesic acid, merophanic acid, platnic acid, pyromellitic acid, merit acid, triylic acid, xylyl acid, hemelitto Acid, mesitylene acid, prenylic acid, toluic acid, cinnamic acid, salicylic acid, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, gentisic acid (2,5-dihydroxybenzoic acid), 2,6-dihydroxy Benzoic acid, 3,5-dihydroxybenzoic acid, gallic acid (3,4,5-trihydroxybenzoic acid), 1,4-dihydroxy-2-naphthoic acid, 3,5-dihydroxy-2-naphthoic acid, etc. Naphthoic acid derivatives; phenolphthaline; diphenolic acid and the like.
- flux-active compounds having a phenolic hydroxyl group examples include phenol, o-cresol, 2,6-xylenol, p-cresol, m-cresol, o-ethylphenol, 2,4-xylenol, 2,5 xylenol, m-ethyl.
- the flux active compound is three-dimensionally incorporated by reaction with a thermosetting resin such as an epoxy resin, at least two phenolic hydroxyl groups that can be added to the epoxy resin in one molecule, and a metal oxide film
- a thermosetting resin such as an epoxy resin
- at least two phenolic hydroxyl groups that can be added to the epoxy resin in one molecule and a metal oxide film
- a compound having at least one carboxyl group directly bonded to an aromatic group exhibiting a flux action in one molecule is preferable.
- examples of such compounds include 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, gentisic acid (2,5-dihydroxybenzoic acid), 2,6-dihydroxybenzoic acid, and 3,4-dihydroxybenzoic acid.
- Benzoic acid derivatives such as gallic acid (3,4,5-trihydroxybenzoic acid); 1,4-dihydroxy-2-naphthoic acid, 3,5-dihydroxy-2-naphthoic acid, 3,7-dihydroxy-2 -Naphthoic acid derivatives such as naphthoic acid; phenolphthaline; and diphenolic acid.
- These flux active compounds may be used alone or in combination of two or more.
- the blending amount of the flux active compound is preferably 1% by weight or more and more preferably 5% by weight or more with respect to the total amount of blending components of the adhesive film from the viewpoint of improving the flux activity. Moreover, it is preferable that the compounding quantity of a flux active compound is 30 weight% or less, and it is more preferable that it is 25 weight% or less.
- Such adhesive films 3, 20 ° C. or higher, JIS C 6481 glass transition temperature of the adhesive film 3 is measured according to Tg a [° C.] in the plane direction to be measured based on JIS C 6481 under the following
- the thermal expansion coefficient is preferably 30 to 300 ppm / ° C., more preferably 500 to 160 ppm / ° C.
- the glass transition point of the adhesive film is preferably 0 to 180 ° C., more preferably 10 to 150 ° C.
- the average thickness of such an adhesive film (adhesive layer) 3 is preferably 5 to 50 ⁇ m, and more preferably 10 to 40 ⁇ m.
- First layer 4 and second layer 5 As shown in FIG. 1, a first layer 4 and a second layer 5 are formed on both surfaces of the core substrate 1 so as to embed the semiconductor element 2 described above.
- the first layer 4 and the second layer 5 preferably have the same physical properties (thermal expansion coefficient, Young's modulus, etc.), and more preferably have the same constituent materials and composition ratios. Thereby, the curvature of the semiconductor element mounting substrate caused by a change in the external environment can be made particularly small.
- the first layer 4 and the second layer 5 are made of a highly insulating resin material.
- the resin material constituting the first layer 4 (second layer 5) is not particularly limited as long as it has high insulating properties.
- the same resin material as that constituting the surface layer 6 as described later is used. Can be used.
- the adhesion with the surface layer 6 is particularly high, and the interface Separation can be prevented.
- the coefficient of thermal expansion close to that of copper, which is a conductor circuit material existing at the interface is obtained, the stress at the interface with the conductor circuit material composed of copper is reduced, ensuring circuit continuity. The effect that it is excellent in doing is also acquired.
- the glass transition point Tg b [° C.] of the first layer 4 (second layer 5) of the first layer 4 (second layer 5) measured in accordance with JIS C 6481 is 20 ° C. or higher.
- the thermal expansion coefficient in the plane direction measured in accordance with JIS C 6481 is preferably 25 to 50 ppm / ° C., more preferably 30 to 46 ppm / ° C.
- the glass transition point Tg b of the first layer 4 (second layer 5) measured in accordance with JIS C 6481 is preferably within a range of 190 to 300 ° C., preferably 230 to 280 ° C. A range is more preferable. Thereby, generation
- the Young's modulus at 25 ° C. of the first layer 4 (second layer 5) is preferably 2 to 10 GPa, more preferably 3 to 7 GPa.
- the Young's modulus of the first layer 4 (second layer 5) is a value in such a range, when the semiconductor element mounting substrate 10 as a whole is warped, the warping force is the first force.
- the layer 4 and the second layer 5 can relax and absorb, and the occurrence of warpage of the semiconductor element mounting substrate 10 can be more effectively reduced.
- the Young's modulus of the first layer 4 is in such a range, even if the first layer 4 has a dimensional change due to a change in the external environment, The impact can be made smaller. As a result, unintentional peeling of the semiconductor element 2 can be prevented more effectively.
- the average thickness of the first layer 4 is T 2 [ ⁇ m] and the average thickness of the core substrate 1 is T 1 [ ⁇ m], a relationship of 0.5 ⁇ T 2 / T 1 ⁇ 2 is satisfied. Is preferable, and it is more preferable to satisfy the relationship of 1 ⁇ T 2 / T 1 ⁇ 1.5. By satisfying such a relationship, the average thickness of the first layer 4 is relatively small, and the influence of the change in the dimension of the first layer 4 on the semiconductor element 2 is reduced. In addition, unintentional peeling of the semiconductor element 2 can be more effectively prevented.
- the thickness of the first layer 4 with respect to the core substrate 1 is reduced, and the influence on the warp due to the change in the dimension of the first layer 4 can be sufficiently suppressed by the core substrate 1 and the surface layer 6.
- the occurrence of warping of the mounting substrate 10 can be reduced more effectively.
- the average thickness of the first layer 4 is preferably 30 to 800 ⁇ m, and more preferably 50 to 200 ⁇ m.
- a surface layer 6 is formed on each of the first layer 4 and the second layer 5.
- the surface layer, 20 ° C. or higher, JIS C 6481 glass transition point of the surface layer is measured according to Tg a [° C.] is measured based on JIS C 6481 under the following Another characteristic is that the thermal expansion coefficient in the surface direction is 40 ppm / ° C. or less.
- the surface layer is less likely to change in dimensions due to changes in the external environment such as outside temperature and humidity, and changes in dimensions caused by differences in the structure of the semiconductor element mounting substrate and the physical properties of each layer. Can be suppressed. As a result, warpage of the semiconductor element mounting substrate can be prevented.
- the semiconductor element is bonded to the substrate (core substrate) through the adhesive layer (adhesive film) as described above, the semiconductor element is unintentionally peeled off from the substrate in combination with the characteristics of the surface layer. It can prevent more effectively.
- the surface layer, 20 ° C. or higher, JIS C 6481 the surface layer of the glass transition point Tg a which is measured in accordance with [°C] surface direction is measured based on JIS C 6481 under the following
- the thermal expansion coefficient is 40 ppm / ° C. or less, and more preferably 3 to 30 ppm / ° C.
- the surface layer 6 is preferably harder than the first layer 4 and the second layer 5 described above. By providing such a relatively hard surface layer 6, it is possible to more reliably suppress changes in dimensions due to differences in the structure of the semiconductor element mounting substrate and the physical properties of each layer. As a result, it is possible to more reliably prevent the semiconductor element mounting substrate 10 from warping.
- the surface layer 6 is preferably harder than the first layer 4 (second layer 5).
- the Young's modulus of the surface layer 6 at 25 ° C. is expressed as X [GPa].
- the Young's modulus at 25 ° C. of the first layer 4 is Y [GPa]
- the Young's modulus at 25 ° C. of the surface layer 6 is preferably 4 to 20 GPa, more preferably 5 to 15 GPa. Thereby, generation
- the surface layer 6, 20 ° C. or higher, the thermal expansion coefficient in the planar direction is measured based on JIS C 6481 at the glass transition point Tg a [° C.] or less of the surface layer 6, which is measured based on JIS C 6481 A [ppm / ° C.], 20 ° C. or higher of the first layer 4 (second layer 5), and the glass transition point Tg b [° C.] of the first layer 4 measured according to JIS C 6481.
- the thermal expansion coefficient in the plane direction measured in accordance with JIS C 6481 below is defined as B [ppm / ° C.]
- the glass transition point Tg a of the surface layer 6, which is measured based on JIS C 6481 is preferably from in the range of 190 ⁇ 300 ° C., and more preferably in the range of 230 ⁇ 280 ° C.. Thereby, generation
- thermosetting resin is included. Thereby, heat resistance can be improved.
- thermosetting resins include novolac type phenol resins such as phenol novolak resin, cresol novolak resin, bisphenol A novolak resin, unmodified resol phenol resin, oil-modified resole phenol modified with tung oil, linseed oil, walnut oil, and the like.
- Resins and other phenolic resins such as resol phenolic resins, bisphenol A epoxy resins, bisphenol F epoxy resins and other bisphenol epoxy resins, novolac epoxy resins, cresol novolac epoxy resins and other novolac epoxy resins, biphenyl epoxy resins and other epoxies Resin, cyanate resin, urea (urea) resin, resin having triazine ring such as melamine resin, unsaturated polyester resin, bismaleimide resin, polyurethane resin, diallyl phthalate Resins, silicone resins, resins having a benzoxazine ring, cyanate ester resins.
- urea (urea) resin resin having triazine ring such as melamine resin, unsaturated polyester resin, bismaleimide resin, polyurethane resin, diallyl phthalate Resins, silicone resins, resins having a benzoxazine ring, cyanate ester resins.
- cyanate resin is particularly preferable. Thereby, the thermal expansion coefficient of the surface layer 6 can be made small. Furthermore, the heat resistance of the surface layer 6 can be made excellent.
- the cyanate resin can be obtained, for example, by reacting a halogenated cyanide compound with a phenol and curing a prepolymer obtained by a method such as heating as necessary.
- Specific examples of the cyanate resin include novolac-type cyanate resins, bisphenol A-type cyanate resins, bisphenol E-type cyanate resins, and bisphenol-type cyanate resins such as tetramethylbisphenol F-type cyanate resins.
- novolac type cyanate resin is preferable. Thereby, the heat resistance improvement by a crosslinking density increase and flame retardance, such as a resin composition, can be improved. This is because the cyanate resin has a triazine ring.
- the novolac-type cyanate resin has a high proportion of benzene rings due to its structure and is easily carbonized. Furthermore, even when the surface layer 6 is thinned (thickness of 35 ⁇ m or less), excellent rigidity can be imparted to the surface layer 6. In particular, since the rigidity at the time of heating is excellent, the occurrence of warpage of the semiconductor element mounting substrate 10 can be more reliably reduced, and the reliability of the semiconductor element mounting substrate 10 can be improved.
- the prepolymer of the novolak-type cyanate resin for example, those represented by the formula (I) can be used.
- the average repeating unit n of the prepolymer of the novolak-type cyanate resin represented by the formula (I) is not particularly limited, but is preferably 1 to 10, and particularly preferably 2 to 7.
- the average repeating unit n is less than the lower limit, the novolak cyanate resin is easily crystallized, and the solubility in a general-purpose solvent is relatively lowered, which may make handling difficult.
- melt viscosity will become high too much and the moldability of the surface layer 6 may fall.
- the weight average molecular weight of the cyanate resin prepolymer is not particularly limited, but is preferably 500 to 4,500, more preferably 600 to 3,000.
- the weight average molecular weight of a resin material such as cyanate resin or a prepolymer can be measured by GPC, for example.
- HLC-8200GPC manufactured by Tosoh Corporation
- TSK GEL polystyrene as a column
- THF tetrahydrofuran
- the content of the cyanate resin in the surface layer 6 is not particularly limited, but is preferably 1 to 20% by weight, and more preferably 3 to 15% by weight. If the content is less than the lower limit, it may be difficult to form the surface layer 6, and if the content exceeds the upper limit, the strength of the surface layer 6 may be reduced.
- thermosetting resin when a cyanate resin (especially a novolac-type cyanate resin) is used as the thermosetting resin, it is preferable to further contain an epoxy resin (substantially free of halogen atoms).
- the epoxy resin examples include phenol novolac type epoxy resin, bisphenol type epoxy resin, naphthalene type epoxy resin, arylalkylene type epoxy resin and the like. Among these, aryl alkylene type epoxy resins are preferable. Thereby, the moisture absorption solder heat resistance and flame retardance of the surface layer 6 can be improved.
- the arylalkylene type epoxy resin refers to an epoxy resin having one or more arylalkylene groups in a repeating unit.
- a xylylene type epoxy resin, a biphenyl dimethylene type epoxy resin, etc. are mentioned.
- a biphenyl dimethylene type epoxy resin is preferable.
- the prepolymer of the biphenyl dimethylene type epoxy resin can be represented by, for example, the formula (II).
- the average repeating unit n of the prepolymer of the biphenyl dimethylene type epoxy resin represented by the above formula (II) is not particularly limited, but is preferably 1 to 10, and more preferably 2 to 5.
- the average repeating unit n is less than the lower limit, the biphenyldimethylene type epoxy resin is easily crystallized, and the solubility in a general-purpose solvent is relatively lowered, which may make handling difficult.
- the average repeating unit n exceeds the upper limit, the fluidity of the resin is lowered, which may cause molding defects and the like.
- the content of the cyanate resin in the resin material is C [wt%] and the content of the epoxy resin in the resin material is D [wt%], it is preferable that 0.5 ⁇ D / C ⁇ 4. More preferably, 1 ⁇ D / C ⁇ 3. Thereby, while being able to improve heat resistance, a thermal expansion coefficient can be made especially small.
- the content of the epoxy resin in the surface layer 6 is not particularly limited, but is preferably 3 to 25% by weight, and more preferably 5 to 20% by weight. When the content is less than the lower limit, the reactivity of the prepolymer of the cyanate resin may decrease, or the moisture resistance of the resulting product may decrease. When the content exceeds the upper limit, the heat resistance may decrease. There is.
- the weight average molecular weight of the prepolymer of the epoxy resin is not particularly limited, but the weight average molecular weight is preferably 500 to 20,000, and particularly preferably 800 to 15,000.
- thermosetting resin when a cyanate resin (especially a novolac-type cyanate resin) is used as the thermosetting resin, it is desirable to contain a phenoxy resin substantially free of halogen atoms. Thereby, the film formability at the time of manufacturing metal foil with a resin and an insulating sheet with a base material can be improved.
- substantially free of halogen atoms means, for example, those in which the content of halogen atoms in the phenoxy resin is 1% by weight or less.
- the phenoxy resin is not particularly limited, and examples thereof include a phenoxy resin having a bisphenol skeleton, a phenoxy resin having a novolac skeleton, a phenoxy resin having a naphthalene skeleton, and a phenoxy resin having a biphenyl skeleton.
- a phenoxy resin having a structure having a plurality of these skeletons can also be used.
- those having a biphenyl skeleton and a bisphenol S skeleton can be used. Thereby, the glass transition temperature can be increased due to the rigidity of the biphenyl skeleton, and the adhesion of the plated metal when the multilayer printed wiring board is manufactured can be improved by the bisphenol S skeleton.
- those having a bisphenol A skeleton and a bisphenol F skeleton can be used.
- the adhesiveness to an inner-layer circuit board can be improved at the time of manufacture of a multilayer printed wiring board.
- what has the said biphenyl skeleton and the bisphenol S skeleton, and what has the bisphenol A skeleton and the bisphenol F skeleton can be used together. Thereby, these characteristics can be expressed with good balance.
- the molecular weight of the phenoxy resin is not particularly limited, but the weight average molecular weight is preferably 5000 to 50000. More preferably, it is 10,000 to 40,000. If the weight average molecular weight is less than the lower limit, the effect of improving the film forming property may be lowered. Moreover, when the said upper limit is exceeded, the solubility of a phenoxy resin may fall.
- the content of the phenoxy resin in the surface layer 6 is not particularly limited, but is preferably 1 to 30% by weight. More preferably, it is 3 to 20% by weight. If the content is less than the lower limit, the effect of improving the film forming property may be lowered. Moreover, when the said upper limit is exceeded, the effect which provides low thermal expansibility may fall.
- the content of cyanate resin in the resin material is C [wt%] and the content of the phenoxy resin in the resin material is E [wt%], it is preferable that 0.2 ⁇ E / C ⁇ 2. More preferably, 0.3 ⁇ E / C ⁇ 1.5. Thereby, the film formability can be improved and the thermal expansion coefficient can be made particularly small.
- a combination of a cyanate resin (particularly a novolac-type cyanate resin), a phenoxy resin (a phenoxy resin having a biphenyl skeleton and a bisphenol S skeleton) and an epoxy resin (an arylalkylene type epoxy resin, particularly a biphenyldimethylene type epoxy resin) was used.
- a cyanate resin particularly a novolac-type cyanate resin
- a phenoxy resin a phenoxy resin having a biphenyl skeleton and a bisphenol S skeleton
- an epoxy resin an arylalkylene type epoxy resin, particularly a biphenyldimethylene type epoxy resin
- thermoplastic resin such as a phenol resin, a polyimide resin, a polyamideimide resin, a polyphenylene oxide resin, or a polyethersulfone resin may be used in addition to the above resin material.
- the content of the resin material as described above in the surface layer 6 is preferably 30 to 70% by weight, and more preferably 40 to 60% by weight. Thereby, the thermal expansion coefficient of the surface layer 6 can be made smaller while increasing the heat resistance of the surface layer 6.
- the surface layer 6 preferably contains an inorganic filler. Thereby, even if the surface layer 6 is thinned (thickness of 35 ⁇ m or less), it can be excellent in strength. Furthermore, the low thermal expansion of the surface layer 6 can be further improved.
- the inorganic filler those described in the description of the core substrate 1 can be used.
- silica is preferable, and fused silica (particularly spherical fused silica) is preferable in terms of excellent low thermal expansion.
- the average particle diameter of the inorganic filler is not particularly limited, but is preferably 0.01 to 5.0 ⁇ m, more preferably 0.2 to 2.0 ⁇ m. preferable.
- the content of the inorganic filler in the surface layer 6 is preferably 5 to 40% by weight, and more preferably 10 to 30% by weight.
- the thermal expansion coefficient of the surface layer 6 can be made smaller effectively. As a result, the occurrence of warpage of the semiconductor element mounting substrate 10 can be more effectively reduced.
- the surface layer 6 preferably contains the fiber base material described in the core substrate 1 in addition to the above components.
- the thermal expansion coefficient of the surface layer 6 can be made especially small. As a result, the occurrence of warpage of the semiconductor element mounting substrate 10 can be more effectively reduced.
- the ratio of the vertical and horizontal lengths of the shape in plan view is preferably 3: 2 to 2: 3, and the vertical and horizontal lengths are substantially equal. preferable. Thereby, the effect of this invention can be made more remarkable.
- FIG. 2 is a diagram showing an example of a method for manufacturing a semiconductor element mounting substrate. First, as shown in FIG. 2A, a core substrate 1 is prepared.
- the semiconductor element 2 is mounted on the central portion of the core substrate 1 via the adhesive film 3.
- an insulating sheet 4 ′ and an insulating sheet 5 ′ in which the materials constituting the first layer 4 and the second layer 5 as described above are formed into a sheet shape are prepared.
- the insulating sheet 4 ′ and the insulating sheet 5 ′ are overlaid on the surface of the core substrate 1 on the semiconductor element 2 side and the opposite side, respectively.
- the insulating sheet 4 ′ and the insulating sheet 5 ′ are cured to form the first layer 4 and the second layer 5 to obtain a semiconductor element embedded substrate (see FIG. 2C).
- an insulating sheet 6 ′ in which the material constituting the surface layer 6 as described above is formed into a sheet shape is prepared.
- the insulating sheet 6 ′ is overlaid on the first layer 4 and the second layer 5. Then, insulating sheet 6 'is hardened and it is set as surface layer 6, and semiconductor element mounting board 10 (semiconductor element mounting board of the present invention) is obtained (refer to Drawing 2 (d)).
- FIG. 3 is also a diagram showing an example of a method for manufacturing a semiconductor element mounting substrate.
- the core substrate 1 is prepared.
- the semiconductor element 2 is mounted on the central portion of the core substrate 1 via the adhesive film 3.
- the insulating sheet 4 ′ in which the material constituting the first layer 4 as described above is formed into a sheet and the insulating sheet 6 ′ in which the material forming the surface layer 6 is formed into a sheet are integrated.
- an insulating sheet 8 in which the insulating sheet 5 ′ in the form of a sheet constituting the material of the second layer 5 and the insulating sheet 6 ′ is integrated is prepared.
- these insulating sheets 7 and 8 have the same composition as the material which comprises the material which comprises the 1st layer 4 and the 2nd layer 5 in FIG. 1, and the insulating sheet 6, sheet thickness was added together It can be produced by making it thick.
- the insulating sheets 7 and 8 have the same composition as the material constituting the first layer 4 and the second layer 5 and the material constituting the surface layer 6 in FIG. In the case of including a fiber substrate such as a glass fiber substrate, it can be produced by making the thickness of both surfaces of the fiber substrate of the surface layer 6 non-uniform.
- the insulating sheet 7 and the insulating sheet 8 are overlaid on the surface of the core substrate 1 on the semiconductor element 2 side and the opposite side, respectively.
- the insulating sheet 7 and the insulating sheet 8 are cured to form the first layer 4, the second layer 5, and the surface layer 6, and the semiconductor element mounting substrate 10 (semiconductor element mounting substrate of the present invention) as shown in FIG. Get.
- the semiconductor element mounting substrate of the present invention can be manufactured by a simpler method.
- the above production method can be suitably used.
- the semiconductor element mounting substrate of the present invention has been described above, but the present invention is not limited to these.
- the adhesive layer is described as being formed using a film-like adhesive film.
- the adhesive layer may be formed by applying a liquid adhesive onto the core substrate and solidifying it.
- the surface layer is described as being formed on the both surfaces by one layer.
- the present invention is not limited to this, and the surface layer may be formed by forming two or more layers on both surfaces.
- the first material, the second layer, and the surface layer are formed using the sheet of the constituent material.
- the present invention is not limited to this. Alternatively, it may be formed by applying a liquid containing a material constituting each layer.
- Raw materials used in Examples and Comparative Examples are as follows.
- Cyanate resin A Novolac type cyanate resin (Lonza, trade name “Primaset PT-30”, weight average molecular weight 700)
- Cyanate resin B Novolac type cyanate resin (Lonza, trade name “Primaset PT-60”, weight average molecular weight 2600)
- Epoxy resin biphenyl dimethylene type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., trade name “NC-3000”, epoxy equivalent 275, weight average molecular weight 2000)
- Phenoxy resin A a copolymer of a biphenyl epoxy resin and a bisphenol S epoxy resin, a resin having an epoxy group at the end (trade name “YX-8100H30” manufactured by Japan Epoxy Resin Co., Ltd., weight (Average molecular weight 30000)
- Phenoxy resin B a copolymer of a bisphenol A type epoxy resin and a bisphenol F type epoxy resin, and a terminal part having an epoxy group (trade name “Epicoat 4275” manufactured by Japan Epoxy Resin Co., Ltd.) , Weight average molecular weight 60000)
- Inorganic filler spherical fused silica (manufactured by Admatechs, trade name “SO-25H”, average particle size 0.5 ⁇ m)
- Adhesive Film A Acrylate ester copolymer (manufactured by Nagase ChemteX Corporation, trade name “SG-708-6”): 25.0 parts by weight, epoxy resin (Nipponization) Product name “EOCN-1020-80”): 16.0 parts by weight, epoxy resin (manufactured by Nippon Kayaku Co., Ltd., product name “NC3000P”): 24.2 parts by weight, phenol resin (manufactured by Sumitomo Bakelite Co., Ltd.) , Trade name “PR51470”): 17.5 parts by weight, curing catalyst (trade name “2PHZ-PW” manufactured by Shikoku Kasei Co., Ltd.): 0.1 part by weight, adhesion aid (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “ KBM403E ”): 0.4 parts by weight and silica as an inorganic filler (manufactured by Nagase ChemteX Corporation, trade name “
- the obtained adhesive is applied to one side of a release film (trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the thickness of the adhesive film after drying using a comma coater device is 25 ⁇ m. This was coated and dried for 5 minutes with a drying apparatus at 90 ° C. to produce an adhesive film A.
- a release film trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.
- the obtained adhesive is applied to one side of a release film (trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the thickness of the adhesive film after drying using a comma coater device is 25 ⁇ m. This was coated and dried for 5 minutes with a drying apparatus at 90 ° C. to produce an adhesive film B.
- a release film trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.
- the obtained adhesive is applied to one side of a release film (trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the thickness of the adhesive film after drying using a comma coater device is 25 ⁇ m. This was coated and dried for 5 minutes with a drying apparatus at 90 ° C. to produce an adhesive film C.
- a release film trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.
- the obtained adhesive is applied to one side of a release film (trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the thickness of the adhesive film after drying using a comma coater device is 25 ⁇ m. This was coated and dried for 5 minutes with a drying apparatus at 90 ° C. to produce an adhesive film D.
- a release film trade name “MRX50” manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.
- Example 1 Manufacture of a semiconductor element mounting substrate (Example 1) A copper substrate of a double-sided copper clad laminate (Sumitomo Bakelite Co., Ltd .: ELC-4785GS) was removed by etching to obtain a core substrate having a thickness of 100 ⁇ m and a 40 mm square.
- a copper substrate of a double-sided copper clad laminate (Sumitomo Bakelite Co., Ltd .: ELC-4785GS) was removed by etching to obtain a core substrate having a thickness of 100 ⁇ m and a 40 mm square.
- a semiconductor element (chip) having a thickness of 75 ⁇ m and a 10 mm square was thermocompression bonded at 130 ° C. to the central portion of the core substrate using the adhesive film A from which the release film was peeled off.
- the core substrate is overlapped on both the chip mounting side and the chip non-mounting side with the insulating sheet layer surface of the insulating sheet A with the base material obtained as described above inside, and this is vacuum-bonded.
- a pressure laminator device After vacuum heating and pressure molding at a pressure of 0.8 MPa and a temperature of 100 ° C. for 30 seconds, and then heat-curing in a hot air dryer at a temperature of 170 ° C. for 45 minutes, The substrate was peeled off and a semiconductor element embedded shape substrate was obtained. That is, the first layer and the second layer were formed.
- the first layer and the second layer are overlapped with the insulating sheet layer surface of the insulating sheet B with base material obtained as described above inside, and this is laminated using a vacuum pressure laminator device. Then, after vacuum heating and pressing at a pressure of 0.8 MPa and a temperature of 80 ° C. for 30 seconds, the substrate was peeled and removed at a temperature of 200 ° C. after being heated and cured in a hot air dryer at a temperature of 180 ° C. for 45 minutes. For 60 minutes to obtain a semiconductor element mounting substrate for evaluation.
- Example 2 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 1 except that the adhesive film B was used instead of the adhesive film A.
- Example 3 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 1 except that the adhesive film C was used instead of the adhesive film A.
- Example 4 A commercially available insulating sheet E with a base material having an average thickness of 120 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd.) is formed on both the chip mounting side and the chip non-mounting side of the core substrate on which the chip is mounted, which is manufactured in the same manner as in Example 1.
- the first and second layers are superposed with the insulating sheet layer surface of the insulating sheet B with the base facing inside, and this is laminated using a vacuum pressurizing laminator device, pressure 0.8 MPa, temperature 80
- a vacuum pressurizing laminator device pressure 0.8 MPa
- temperature 80 After vacuum heating and pressing at 30 ° C. for 30 seconds, the substrate is peeled and removed after being heated and cured in a hot air dryer at a temperature of 180 ° C. for 45 minutes, and then heated and cured at a temperature of 200 ° C. for 60 minutes.
- a semiconductor element mounting substrate for evaluation was obtained.
- Example 5 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 4 except that the adhesive film B was used instead of the adhesive film A.
- Example 6 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 4 except that the adhesive film C was used instead of the adhesive film A.
- Example 7 Made in the same manner as in Example 1, on both the chip mounting side and the chip non-mounting side of the chip-mounted core substrate, with the insulating sheet layer surface of the insulating sheet A with the base facing inward, Using a vacuum pressurization laminator, vacuum press-molding is performed at a pressure of 1.0 MPa and a temperature of 105 ° C. for 30 seconds, and then the substrate is peeled off and heated in a hot air dryer at a temperature of 180 ° C. for 90 minutes. Curing was performed to obtain a substrate with a semiconductor element embedded shape. That is, the first layer and the second layer were formed.
- the first and second layers are superposed with the insulating sheet layer surface of the insulating sheet C with the substrate facing inside, and this is laminated using a vacuum pressurizing laminator device, pressure 0.8 MPa, temperature 80
- a vacuum pressurizing laminator device pressure 0.8 MPa
- temperature 80 After vacuum heating and pressing at 30 ° C. for 30 seconds, the substrate is peeled and removed after being heated and cured in a hot air dryer at a temperature of 180 ° C. for 45 minutes, and then heated and cured at a temperature of 200 ° C. for 60 minutes.
- a semiconductor element mounting substrate for evaluation was obtained.
- Example 8 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 7 except that the adhesive film B was used instead of the adhesive film A.
- Example 9 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 7 except that the adhesive film C was used instead of the adhesive film A.
- Example 10 A copper substrate of a double-sided copper clad laminate (Sumitomo Bakelite Co., Ltd .: ELC-4785GS) was removed by etching to obtain a core substrate having a thickness of 100 ⁇ m and a 40 mm square.
- a semiconductor element (chip) having a thickness of 140 ⁇ m and a 10 mm square was thermocompression bonded at 130 ° C. to the central portion of the core substrate using the adhesive film A from which the release film was peeled off.
- the core substrate is superposed on both the chip mounting side and the chip non-mounting side with the insulating sheet layer surface of the insulating sheet D with the base inside, and this is laminated using a vacuum pressurizing laminator device.
- vacuum heating and pressure forming at a pressure of 0.8 MPa and a temperature of 100 ° C. for 30 seconds
- the substrate is peeled and removed by heating and curing in a hot air dryer at a temperature of 170 ° C. for 45 minutes, and a semiconductor element embedded shape Substrate was obtained. That is, the first layer and the second layer were formed.
- the first and second layers are superposed with the insulating sheet layer surface of the insulating sheet B with the base facing inside, and this is laminated using a vacuum pressurizing laminator device, pressure 0.8 MPa, temperature 80
- a vacuum pressurizing laminator device pressure 0.8 MPa
- temperature 80 After vacuum heating and pressing at 30 ° C. for 30 seconds, the substrate is peeled and removed after being heated and cured in a hot air dryer at a temperature of 180 ° C. for 45 minutes, and then heated and cured at a temperature of 200 ° C. for 60 minutes.
- a semiconductor element mounting substrate for evaluation was obtained.
- Example 11 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 10 except that the adhesive film B was used instead of the adhesive film A.
- Example 12 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 10 except that the adhesive film C was used instead of the adhesive film A.
- Example 13 A commercially available insulating sheet F with a base material having an average thickness of 160 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd.) on both the chip mounting side and the chip non-mounting side of the core substrate mounted with the chip manufactured in the same manner as in Example 10.
- the first and second layers are superposed with the insulating sheet layer surface of the insulating sheet B with the base facing inside, and this is laminated using a vacuum pressurizing laminator device, pressure 0.8 MPa, temperature 80
- a vacuum pressurizing laminator device pressure 0.8 MPa
- temperature 80 After vacuum heating and pressing at 30 ° C. for 30 seconds, the substrate is peeled and removed after being heated and cured in a hot air dryer at a temperature of 180 ° C. for 45 minutes, and then heated and cured at a temperature of 200 ° C. for 60 minutes.
- a semiconductor element mounting substrate for evaluation was obtained.
- Example 14 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 13 except that the adhesive film B was used instead of the adhesive film A.
- Example 15 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 13 except that the adhesive film C was used instead of the adhesive film A.
- Example 16 Fabricated in the same manner as in Example 10, on both the chip mounting side and the chip non-mounting side of the chip-mounted core substrate, with the insulating sheet layer surface of the insulating sheet D with the base material facing inward, Using a vacuum pressurization laminator, vacuum press-molding is performed at a pressure of 1.0 MPa and a temperature of 105 ° C. for 30 seconds, and then the substrate is peeled off and heated in a hot air dryer at a temperature of 180 ° C. for 90 minutes. Curing was performed to obtain a substrate with a semiconductor element embedded shape. That is, the first layer and the second layer were formed.
- the first and second layers are overlapped with the insulating sheet layer surface of the insulating sheet C with the base material obtained in the same manner as in Example 1 inside, and this is laminated with a vacuum pressure laminator device.
- vacuum pressure and pressure molding at a pressure of 0.8 MPa and a temperature of 80 ° C. for 30 seconds, and then heat-curing with a hot air dryer at a temperature of 180 ° C. for a time of 45 minutes, the substrate is peeled and removed, and the temperature Heat curing was performed at 200 ° C. for 60 minutes to obtain a semiconductor element mounting substrate for evaluation.
- Example 17 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 16 except that the adhesive film C was used instead of the adhesive film A.
- Example 3 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 7 except that the adhesive film D was used instead of the adhesive film A.
- Example 4 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 10 except that the adhesive film D was used instead of the adhesive film A.
- Example 6 A semiconductor element mounting substrate for evaluation was obtained in the same manner as in Example 16 except that the adhesive film D was used instead of the adhesive film A.
- Example 7 A commercially available insulating sheet E with a base material having an average thickness of 120 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd.) is formed on both the chip mounting side and the chip non-mounting side of the core substrate on which the chip is mounted, which is manufactured in the same manner as in Example 1.
- the first layer and the second layer are provided with the insulating sheet layer surface of a commercially available insulating sheet G with a substrate having an average thickness of 40 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd .: trade name “ABF-GX13”) inside. Then, this was superposed, vacuum-pressed and molded at a pressure of 0.8 MPa and a temperature of 80 ° C. for 30 seconds using a vacuum pressurizing laminator, and then heated in a hot air dryer at a temperature of 180 ° C. for 45 minutes. After curing, the substrate was peeled and removed, and cured by heating at a temperature of 200 ° C. for 60 minutes to obtain a semiconductor element mounting substrate for evaluation.
- ABSGX13 average thickness of 40 ⁇ m
- Example 8 A commercially available insulating sheet F with a substrate having an average thickness of 160 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd.) was formed on both the chip mounting side and the chip non-mounting side of the core substrate on which the chip was mounted, which was manufactured in the same manner as in Example 11.
- the first layer and the second layer are provided with the insulating sheet layer surface of a commercially available insulating sheet G with a substrate having an average thickness of 40 ⁇ m (manufactured by Ajinomoto Fine Chemical Co., Ltd .: trade name “ABF-GX13”) inside. Then, this was superposed, vacuum-pressed and molded at a pressure of 0.8 MPa and a temperature of 80 ° C. for 30 seconds using a vacuum pressurizing laminator, and then heated in a hot air dryer at a temperature of 180 ° C. for 45 minutes. After curing, the substrate was peeled and removed, and cured by heating at a temperature of 200 ° C. for 60 minutes to obtain a semiconductor element mounting substrate for evaluation.
- ABSGX13 average thickness of 40 ⁇ m
- the surface layer, first layer (second layer) Young's modulus, linear expansion coefficient (thermal expansion coefficient), and glass transition point of the semiconductor element mounting substrate obtained in each of the above Examples and Comparative Examples are shown below. These results are shown in Tables 1 and 2. Moreover, the storage elastic modulus of each adhesive film used in each of the above Examples and Comparative Examples was measured as shown below and shown in Table 1. The Young's modulus, linear expansion coefficient (thermal expansion coefficient), and glass transition point of each adhesive film and core substrate were also measured in the same manner as described below, and are shown in Tables 1 and 2.
- the area of the first layer when the first layer is viewed in plan is 100
- the area of the semiconductor element shown as S in the table
- the first layer Table 2 shows the volume of the semiconductor element (indicated as V in the table) when the volume is 100.
- Table 2 shows the thickness ratio between the core substrate and the first layer.
- Young's modulus Two insulating sheets with a base material used for forming the surface layer and the first layer (second layer) of the semiconductor element mounting substrate of each of the above examples and comparative examples, with the insulating sheet sides facing each other. This was superposed and subjected to heat and pressure molding for 2 hours at a pressure of 2 MPa and a temperature of 200 ° C. using a vacuum press apparatus, and then the substrate was peeled off to obtain a cured insulating sheet.
- a sample for evaluation of 8 mm ⁇ 35 mm was collected from the cured product of the obtained insulating sheet, and DMA device (TA Instruments, DMA2980, measurement mode: tension, measurement length: 20 mm, temperature increase rate: 5 ° C./min, Measurement temperature range: 0 to 350 ° C., frequency: 1 Hz), Young's modulus at 25 ° C. was measured.
- a sample for evaluation of 4 mm ⁇ 20 mm was collected from the obtained cured cured insulating sheet, and a TMA device (TA Instruments, TMA2940, measurement mode: tension, measurement length: 20 mm, temperature increase rate: 10 ° C./min, Using the measurement temperature range: 0 to 300 ° C., the measurement load: 5 gf), the thermal expansion coefficient in the plane direction was measured.
- TMA device TMA2940, measurement mode: tension, measurement length: 20 mm, temperature increase rate: 10 ° C./min, Using the measurement temperature range: 0 to 300 ° C., the measurement load: 5 gf), the thermal expansion coefficient in the plane direction was measured.
- a 10 mm ⁇ 30 mm sample for evaluation was cut out from the obtained cured insulating sheet, and DMA (manufactured by TA Instruments, DMA 2980, measurement mode: tensile, measurement length: 20 mm, temperature increase rate: 5 ° C./min, measurement Temperature range: 0 to 350 ° C., frequency: 1 Hz), and the peak position of tan ⁇ was defined as the glass transition temperature.
- DMA manufactured by TA Instruments, DMA 2980, measurement mode: tensile, measurement length: 20 mm, temperature increase rate: 5 ° C./min, measurement Temperature range: 0 to 350 ° C., frequency: 1 Hz
- the peak position of tan ⁇ was defined as the glass transition temperature.
- the adhesive film having a thickness of 25 ⁇ m obtained in each of the above Examples and Comparative Examples was heat-treated at 175 ° C. for 2 hours to obtain a cured adhesive film.
- a sample for evaluation of 3 mm ⁇ 25 mm was collected from the obtained cured adhesive film, and a TMA apparatus (TMA / SS6100 manufactured by Seiko Instruments Inc., measurement mode: tension, measurement length: 10 mm, temperature increase rate: 5 ° C./min, measurement
- the thermal expansion coefficient in the plane direction was measured using a temperature range: ⁇ 65 to 300 ° C. and a measurement load of 1 gf). Further, the glass transition temperature was determined from the inflection point when pulled.
- the warpage of the semiconductor element surface portion of the semiconductor element mounting substrate at 260 ° C. was measured and shown in Table 3, and the absolute value of the difference between the warpage at normal temperature and the warpage at 260 ° C. was combined. It was shown to.
- the semiconductor element mounting substrate of the present invention was highly reliable because warpage at room temperature and unintentional peeling of the semiconductor element were prevented.
- the semiconductor element mounting substrate of the present invention is one in which cracking of the semiconductor element due to a change in the external environment, peeling from the substrate, and warpage are prevented.
- a satisfactory result was not obtained.
- the present invention it is possible to provide a semiconductor element mounting substrate capable of preventing warpage and preventing the built-in semiconductor element from peeling from the substrate. Therefore, it has industrial applicability.
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Abstract
Description
(1) 基板と、
前記基板の一方の面側に搭載された半導体素子と、
前記基板と前記半導体素子とを接着する接着層と、
前記半導体素子を埋め込む第1の層と、
前記基板の前記第1の層とは反対側に設けられた第2の層と、
前記第1の層上および前記第2の層上に設けられた少なくとも1層の表層とを有し、
前記接着層の25℃における貯蔵弾性率が、5~1000MPaであり、
前記表層の、20℃以上、JIS C 6481に準拠して測定される前記表層のガラス転移点Tga[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数が、40ppm/℃以下であることを特徴とする半導体素子搭載基板。
前記第1の層の体積を100としたとき、前記半導体素子の体積は、2~7である上記(1)ないし(3)のいずれかに記載の半導体素子搭載基板。
前記接着剤は、(メタ)アクリル酸エステル共重合体と、エポキシ樹脂と、フェノール樹脂と、無機充填剤とを含む樹脂組成物で構成されるものである上記(1)ないし(4)のいずれかに記載の半導体素子搭載基板。
前記樹脂材料中の前記シアネート樹脂の含有率をC[重量%]、前記樹脂材料中のエポキシ樹脂の含有率をD[重量%]としたとき、0.5≦D/C≦4である上記(16)ないし(18)のいずれかに記載の半導体素子搭載基板。
前記樹脂材料中の前記シアネート樹脂の含有率をC[重量%]、前記樹脂材料中のフェノキシ樹脂の含有率をE[重量%]としたとき、0.2≦E/C≦2である上記(16)ないし(19)のいずれかに記載の半導体素子搭載基板。
<半導体素子搭載基板>
図1は、本発明の半導体素子搭載基板の好適な実施形態を示す縦断面図である。なお、以下の説明では、図1中の上側を「上」または「上方」という。
コア基板1は、搭載された半導体素子2を支持する機能を有している。
半導体素子2は、図1に示すように、後述するような接着層3を介してコア基板1に接合されている。
接着フィルム(接着層)3は、上述したような半導体素子2をコア基板1上に接着する機能を備えている。
エポキシ樹脂の具体例として、フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂等のノボラック型エポキシ樹脂;ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂等のビスフェノール型エポキシ樹脂;ハイドロキノン型エポキシ樹脂;ビフェニル型エポキシ樹脂;スチルベン型エポキシ樹脂;トリフェノールメタン型エポキシ樹脂;トリアジン核含有エポキシ樹脂;ジシクロペンタジエン変性フェノール型エポキシ樹脂;ナフトール型エポキシ樹脂、および、フェニレンおよび/またはビフェニレン骨格を有するフェノールアラルキル型エポキシ樹脂、フェニレンおよび/またはビフェニレン骨格を有するナフトールアラルキル型エポキシ樹脂等のアラルキル型エポキシ樹脂が挙げられる。
コア基板1の両面には、図1に示すように、前述した半導体素子2を埋め込むように形成された第1の層4と、第2の層5とが形成されている。
第1の層4(第2の層5)を構成する樹脂材料としては、絶縁性の高いものであれば特に限定されず、例えば、後述するような表層6を構成する樹脂材料と同様のものを用いることができる。特に、第1の層4(第2の層5)が、後述する表層6を構成する樹脂材料と同じ樹脂材料で構成されている場合、表層6との密着性が特に高いものとなり、界面の剥離を防止できる。また、界面に存在する導体回路材料である銅の熱膨張率に近い熱膨張率が得られる為、銅で構成された導体回路材料との界面でのストレスを低減し、回路の導通性を確保する事に優れる、といった効果も得られる。
また、第1の層4上および第2の層5上には、それぞれ、表層6が形成されている。
次に、上述したような半導体素子搭載基板の製造方法の一例について説明する。
まず、図2(a)に示すように、コア基板1を用意する。
その後、絶縁シート6’を硬化させて、表層6とし、半導体素子搭載基板10(本発明の半導体素子搭載基板)を得る(図2(d)参照)。
図3も、半導体素子搭載基板の製造方法の一例を示す図である。
まず、図3(a)に示すように、コア基板1を用意する。
実施例及び比較例において用いた原材料は以下の通りである。
シアネート樹脂A:15重量部、シアネート樹脂B:10重量部、エポキシ樹脂:25重量部、フェノキシ樹脂A:5重量部、フェノキシ樹脂B:5重量部、硬化触媒:0.4重量部をメチルエチルケトンに溶解、分散させた。さらに、無機充填材40重量部とカップリング剤0.2重量部を添加して、高速攪拌装置を用いて10分間攪拌して、固形分50重量%の樹脂ワニスを調製した。
(1)基材付絶縁性シートAの作製
上記のようにして得られた樹脂ワニスを、厚さ38μmのPET(ポリエチレンテレフタレート)フィルムの片面に、コンマコーター装置を用いて乾燥後の絶縁フィルムの厚さが120μmとなるように塗工し、これを160℃の乾燥装置で10分間乾燥して、基材付絶縁シートAを製造した。
上記のようにして得られた樹脂ワニスを、ガラス織布(WEA-1035、厚さ:28μm、日東紡績製)に含浸し、120℃の加熱炉で2分間乾燥してワニス固形分(プリプレグ中に樹脂とシリカの占める成分)が約50wt%のプリプレグを得た。このプリプレグを用い、厚さ38μmのPET(ポリエチレンテレフタレート)フィルムの片面に、ラミネーター装置を用いて乾燥後の絶縁フィルムの厚さが40μmとなるように貼り付け、これを160℃の乾燥装置で10分間乾燥して、基材付絶縁シートBを製造した。
上記のようにして得られた樹脂ワニスを、厚さ38μmのPET(ポリエチレンテレフタレート)フィルムの片面に、コンマコーター装置を用いて乾燥後の絶縁フィルムの厚さが40μmとなるように塗工し、これを160℃の乾燥装置で10分間乾燥して、基材付絶縁シートCを製造した。
上記のようにして得られた樹脂ワニスを、厚さ38μmのPET(ポリエチレンテレフタレート)フィルムの片面に、コンマコーター装置を用いて乾燥後の絶縁フィルムの厚さが160μmとなるように塗工し、これを160℃の乾燥装置で10分間乾燥して、基材付絶縁シートDを製造した。
(1)接着フィルムAの作製
アクリル酸エステル共重合体(ナガセケムテックス社製、商品名「SG-708-6」):25.0重量部、エポキシ樹脂(日本化薬社製、商品名「EOCN-1020-80」):16.0重量部、エポキシ樹脂(日本化薬社製、商品名「NC3000P」):24.2重量部、フェノール樹脂(住友ベークライト社製、商品名「PR51470」):17.5重量部、硬化触媒(四国化成社製、商品名「2PHZ-PW」):0.1重量部、密着助剤(信越化学工業社製、商品名「KBM403E」):0.4重量部、無機充填材としてのシリカ(アドマテックス社製、商品名「SE-2050LC」):16.7重量部を混合して、接着剤を得た。なお、上記重量部は、固形分としての重量部を指す。
アクリル酸エステル共重合体(ナガセケムテックス社製、商品名「SG-70L」):11.2重量部、アクリルポリマー(東亞合成社製、商品名「UG-4010」):6.8重量部、エポキシ樹脂(日本化薬社製、商品名「EOCN-1020-80」):17.7重量部、エポキシ樹脂(日本化薬社製、商品名「NC6000」):26.5重量部、フェノール樹脂(住友ベークライト社製、商品名「PR-HF-3」):11.1重量部、フェノール樹脂(明和化成社製、商品名「MEH8000H」):16.6重量部、硬化触媒(四国化成社製、商品名「2PHZ-PW」):0.1重量部、密着助剤(信越化学工業社製、商品名「KBM403E」):0.1重量部、無機充填材としてのシリカ(アドマテックス社製、商品名「SE-2050LC」):10.0重量部を混合して、接着剤を得た。なお、上記重量部は、固形分としての重量部を指す。
アクリル酸エステル共重合体(ナガセケムテックス社製、商品名「SG-70L」):53.99重量部、エポキシ樹脂(日本化薬社製、商品名「EOCN-1020-80」):3.73重量部、フェノール樹脂(住友ベークライト社製、商品名「PR53647」):1.91重量部、硬化触媒(四国化成社製、商品名「2PHZ-PW」):0.04重量部、密着助剤(信越化学工業社製、商品名「KBM403E」):0.31重量部、無機充填材としてのシリカ(アドマテックス社製、商品名「SE-2050LE」):40.01重量部を混合して、接着剤を得た。なお、上記重量部は、固形分としての重量部を指す。
アクリル酸エステル共重合体(ナガセケムテックス社製、商品名「SG-70L」):42.0重量部、エポキシ樹脂(日本化薬社製、商品名「EOCN-1020-80」):4.53重量部、エポキシ樹脂(日本化薬社製、商品名「NC6000」):6.86重量部、フェノール樹脂(住友ベークライト社製、商品名「PR53647」):5.92重量部、硬化触媒(四国化成社製、商品名「2PHZ-PW」):0.06重量部、密着助剤(信越化学工業社製、商品名「KBM403E」):0.63重量部、無機充填材としてのシリカ(アドマテックス社製、商品名「SE-2050LE」):40.0重量部を混合して、接着剤を得た。なお、上記重量部は、固形分としての重量部を指す。
(実施例1)
両面銅張積層板(住友ベークライト株式会社製:ELC-4785GS)の銅箔をエッチング処理し取り除く事で、厚さ100μm、40mm角のコア基板を得た。
接着フィルムAの代わりに、接着フィルムBを用いた以外は、前記実施例1と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例1と同様にして、評価用の半導体素子搭載基板を得た。
実施例1と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、平均厚さが120μmの市販の基材付絶縁シートE(味の素ファインケミカル株式会社製:商品名「ABF-GX13」)の絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
接着フィルムAの代わりに、接着フィルムBを用いた以外は、前記実施例4と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例4と同様にして、評価用の半導体素子搭載基板を得た。
実施例1と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、基材付絶縁シートAの絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
接着フィルムAの代わりに、接着フィルムBを用いた以外は、前記実施例7と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例7と同様にして、評価用の半導体素子搭載基板を得た。
両面銅張積層板(住友ベークライト株式会社製:ELC-4785GS)の銅箔をエッチング処理し取り除く事で、厚さ100μm、40mm角のコア基板を得た。
接着フィルムAの代わりに、接着フィルムBを用いた以外は、前記実施例10と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例10と同様にして、評価用の半導体素子搭載基板を得た。
実施例10と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、平均厚さが160μmの市販の基材付絶縁シートF(味の素ファインケミカル株式会社製:商品名「ABF-GX13」)の絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
接着フィルムAの代わりに、接着フィルムBを用いた以外は、前記実施例13と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例13と同様にして、評価用の半導体素子搭載基板を得た。
実施例10と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、基材付絶縁シートDの絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
接着フィルムAの代わりに、接着フィルムCを用いた以外は、前記実施例16と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例1と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例4と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例7と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例10と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例13と同様にして、評価用の半導体素子搭載基板を得た。
接着フィルムAの代わりに、接着フィルムDを用いた以外は、前記実施例16と同様にして、評価用の半導体素子搭載基板を得た。
実施例1と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、平均厚さが120μmの市販の基材付絶縁シートE(味の素ファインケミカル株式会社製:商品名「ABF-GX13」)の絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
実施例11と同様にして作製した、チップ搭載済みのコア基板のチップ搭載側およびチップ未搭載側の両方に、平均厚さが160μmの市販の基材付絶縁シートF(味の素ファインケミカル株式会社製:商品名「ABF-GX13」)の絶縁シート層面を内側にして、重ね合わせ、これを、真空加圧式ラミネーター装置を用いて、圧力1.0MPa、温度105℃で30秒間、真空加熱加圧成形した後、基材を剥離除去し、熱風乾燥機にて温度180℃、時間90分間で加熱硬化させ、半導体素子埋め込み形状の基板を得た。すなわち、第1の層および第2の層を形成した。
上記各実施例および各比較例の半導体素子搭載基板の表層および第1の層(第2の層)の形成に用いた基材付き絶縁シート2枚を、絶縁シート側どうしを内側にして重ね合わせ、これを、真空プレス装置を用いて圧力2MPa、温度200℃で2時間加熱加圧成形を行った後、基材を剥離除去して、絶縁シート硬化物を得た。得られた絶縁シート硬化物から8mm×35mmの評価用試料を採取し、DMA装置(TAインスツルメント社製、DMA2980、測定モード:引張り、測定長:20mm、昇温速度:5℃/min、測定温度域:0~350℃、周波数:1Hz)を用いて、25℃におけるヤング率を測定した。
上記各実施例および各比較例の半導体素子搭載基板の表層および第1の層(第2の層)の形成に用いた基材付き絶縁シート2枚を、絶縁シート側どうしを内側にして重ね合わせ、これを、真空プレス装置を用いて圧力2MPa、温度200℃で2時間加熱加圧成形を行った後、基材を剥離除去して、絶縁シート硬化物を得た。得られた絶縁シート硬化物から4mm×20mmの評価用試料を採取し、TMA装置(TAインスツルメント社製、TMA2940、測定モード:引張り、測定長:20mm、昇温速度:10℃/min、測定温度域:0~300℃、測定荷重:5gf)を用いて、面方向における熱膨張係数を測定した。
上記各実施例および各比較例の半導体素子搭載基板の表層および第1の層(第2の層)の形成に用いた基材付き絶縁シート2枚を、絶縁シート側どうしを内側にして重ね合わせ、これを、真空プレス装置を用いて圧力2MPa、温度200℃で2時間加熱加圧成形を行った後、基材を剥離除去して、絶縁シート硬化物を得た。得られた絶縁シート硬化物から、10mm×30mmの評価用試料を切り出し、DMA(TAインスツルメント社製、DMA2980、測定モード:引張り、測定長:20mm、昇温速度:5℃/min、測定温度域:0~350℃、周波数:1Hz)を用いて、5℃/分で昇温し、tanδのピーク位置をガラス転移温度とした。
(貯蔵弾性率の測定方法)
上記各実施例および各比較例で得られた厚み25μmの接着フィルムを、175℃2時間熱処理し、接着フィルム硬化物を得た。得られた接着フィルム硬化物から10mm×25mmの評価用試料を採取し、DMA(セイコーインスツルメンツ社製、DMS210、測定モード:引張り、測定長:20mm、昇温速度:3℃/min、測定温度域:-65~300℃、周波数:10Hz)を用いて、3℃/分で昇温し、25℃における貯蔵弾性率(E’)を求めた。
上記各実施例および各比較例で得られた厚み25μmの接着フィルムを、175℃2時間熱処理し、接着フィルム硬化物を得た。得られた接着フィルム硬化物から3mm×25mmの評価用試料を採取し、TMA装置(セイコーインスツルメンツ社製TMA/SS6100、測定モード:引張り、測定長:10mm、昇温速度:5℃/min、測定温度域:-65~300℃、測定荷重:1gf)を用いて、面方向における熱膨張係数を測定した。さらに引っ張った際の変曲点よりガラス転移温度を求めた。
[1]
上記各実施例および各比較例で得られた半導体素子搭載基板の常温時(25℃)での半導体素子表面部分の反りを測定し、表3に示した。
上記各実施例および各比較例で得られた半導体素子搭載基板各10枚を用いて、冷熱サイクル試験(冷却状態-65℃、加熱状態150℃で1000サイクルおよび3000サイクル)を行い、半導体素子への保護性能を比較評価した。
Claims (20)
- 基板と、
前記基板の一方の面側に搭載された半導体素子と、
前記基板と前記半導体素子とを接着する接着層と、
前記半導体素子を埋め込む第1の層と、
前記基板の前記第1の層とは反対側に設けられた第2の層と、
前記第1の層上および前記第2の層上に設けられた少なくとも1層の表層とを有し、
前記接着層の25℃における貯蔵弾性率が、5~1000MPaであり、
前記表層の、20℃以上、JIS C 6481に準拠して測定される前記表層のガラス転移点Tga[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数が、40ppm/℃以下であることを特徴とする半導体素子搭載基板。 - 前記基板の平均厚さをT1[μm]、前記第1の層の平均厚さをT2[μm]としたとき、0.5≦T2/T1≦3.0の関係を満足する請求の範囲第1項に記載の半導体素子搭載基板。
- 前記接着層の平均厚さは、5~50μmである請求の範囲第1項に記載の半導体素子搭載基板。
- 前記第1の層を平面視した際の前記第1の層の面積を100としたとき、前記半導体素子を平面視した際の前記半導体素子の面積は、6~10であり、
前記第1の層の体積を100としたとき、前記半導体素子の体積は、2~7である請求の範囲第1項に記載の半導体素子搭載基板。 - 前記接着層は、接着剤で構成され、
前記接着剤は、(メタ)アクリル酸エステル共重合体と、エポキシ樹脂と、フェノール樹脂と、無機充填剤とを含む樹脂組成物で構成されるものである請求の範囲第1項に記載の半導体素子搭載基板。 - 前記接着層のガラス転移点は、0~180℃である請求の範囲第1項に記載の半導体素子搭載基板。
- 前記第1の層の、20℃以上、JIS C 6481に準拠して測定される前記第1の層のガラス転移点Tgb[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数は、25~50ppm/℃である請求の範囲第1項に記載の半導体素子搭載基板。
- 前記第1の層の25℃におけるヤング率は、2~10GPaである請求の範囲第1項に記載の半導体素子搭載基板。
- JIS C 6481に準拠して測定される前記第1の層のガラス転移点Tgbは、100~250℃の範囲内である請求の範囲第1項に記載の半導体素子搭載基板。
- 前記表層の25℃におけるヤング率をX[GPa]、前記第1の層の25℃におけるヤング率をY[GPa]としたとき、0.5≦X-Y≦13の関係を満足する請求の範囲第1項に記載の半導体素子搭載基板。
- 前記表層の25℃におけるヤング率は、4~15GPaである請求の範囲第1項に記載の半導体素子搭載基板。
- 前記表層の、20℃以上、JIS C 6481に準拠して測定される前記表層のガラス転移点Tga[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数をA[ppm/℃]、前記第1の層の、20℃以上、JIS C 6481に準拠して測定される前記第1の層のガラス転移点Tgb[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数をB[ppm/℃]としたとき、0.5≦B-A≦50の関係を満足する請求の範囲第1項に記載の半導体素子搭載基板。
- JIS C 6481に準拠して測定される前記表層のガラス転移点Tgaは、100~300℃の範囲内である請求の範囲第1項に記載の半導体素子搭載基板。
- 前記基板の25℃におけるヤング率は、20~50GPaである請求の範囲第1項に記載の半導体素子搭載基板。
- 前記基板の、20℃以上、JIS C 6481に準拠して測定される前記基板のガラス転移点Tgc[℃]以下でのJIS C 6481に準拠して測定される面方向の熱膨張係数は、13ppm/℃以下である請求の範囲第1項に記載の半導体素子搭載基板。
- 前記表層は、主として、シアネート樹脂を含む樹脂材料と無機充填材とで構成されたものである請求の範囲第1項に記載の半導体素子搭載基板。
- 前記表層中における前記樹脂材料の含有量は、30~70重量%である請求の範囲第16項に記載の半導体素子搭載基板。
- 前記表層中における前記無機充填材の含有量は、5~40重量%である請求の範囲第16項に記載の半導体素子搭載基板。
- 前記樹脂材料は、エポキシ樹脂をさらに含み、
前記樹脂材料中の前記シアネート樹脂の含有率をC[重量%]、前記樹脂材料中のエポキシ樹脂の含有率をD[重量%]としたとき、0.5≦D/C≦4である請求の範囲第16項に記載の半導体素子搭載基板。 - 前記樹脂材料は、フェノキシ樹脂をさらに含み、
前記樹脂材料中の前記シアネート樹脂の含有率をC[重量%]、前記樹脂材料中のフェノキシ樹脂の含有率をE[重量%]としたとき、0.2≦E/C≦2である請求の範囲第16項に記載の半導体素子搭載基板。
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CN103094133A (zh) | 2013-05-08 |
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