WO2020090205A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2020090205A1 WO2020090205A1 PCT/JP2019/033371 JP2019033371W WO2020090205A1 WO 2020090205 A1 WO2020090205 A1 WO 2020090205A1 JP 2019033371 W JP2019033371 W JP 2019033371W WO 2020090205 A1 WO2020090205 A1 WO 2020090205A1
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- semiconductor chip
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- H10W74/473—
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- H10W42/121—
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- H10W72/01336—
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- H10W72/07141—
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- H10W72/07331—
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Definitions
- the present disclosure relates to a semiconductor device and a manufacturing method thereof.
- Wire bonding is a method of connecting a semiconductor chip and a substrate by using a metal thin wire such as a gold wire.
- a method called flip-chip connection (FC connection) is becoming widespread in order to meet the demand for higher functionality, higher integration, higher speed, etc. of semiconductor devices.
- the FC connection is a method in which conductive protrusions called bumps are formed on a semiconductor chip or a substrate to directly connect the semiconductor chip and the substrate.
- Examples of modes of FC connection include a method of metal bonding using solder, tin, gold, silver, copper, etc., a method of metal bonding by applying ultrasonic vibration, a method of maintaining mechanical contact by the contracting force of resin, and the like.
- a method of metal bonding using solder, tin, gold, silver, copper or the like is common.
- COB Chip On Board
- FC connection method is known as a method for connecting a semiconductor chip and a substrate.
- COB is a type of FC connection.
- CoC Chip On Chip
- CoW Chip On Wefer
- Patent Document 1 discloses a method for bonding semiconductor wafers.
- semiconductor devices are highly required to have high functionality, and specifically, thinning, downsizing, increase in the number of pins (bumps and / or wirings), There is a demand for narrowing the pitch or gap.
- chip stack type packages that have multiple connection methods described above, such as POP (Package On Package), TSV (Through Silicon Via), etc.
- POP Package On Package
- TSV Through Silicon Via
- the semiconductor chip spacing tends to become narrower during package assembly.
- the interval between the adjacent semiconductor chips By narrowing the interval between the adjacent semiconductor chips, many semiconductor chips can be mounted on the substrate or the wafer, and the cost can be reduced. Further, by narrowing the interval between the adjacent semiconductor chips, it is possible to assemble different kinds of semiconductor chips in a small area, and it is possible to perform high-density mounting.
- the shape of the adhesive layer is often the same square or rectangle as the semiconductor chip.
- a portion where the resin material forming the adhesive layer protrudes from the semiconductor chip after the pressure bonding step is called a fillet. Since the resin material flows in a circular shape at the time of pressure bonding, the fillet at the corner of the semiconductor chip becomes smaller than the fillet at the side of the semiconductor chip. The fillet at the corner of the semiconductor chip (end of the side of the semiconductor chip) is called coverage.
- the reliability of the semiconductor device tends to decrease.
- the fillet on the side of the semiconductor chip becomes large, which makes it difficult to reduce the cost and mount the device at high density. That is, it is difficult to make both the fillet on the side of the semiconductor chip small and the coverage secured.
- the present disclosure aims to provide a semiconductor device having a small fillet on the side of a semiconductor chip and ensuring coverage, and a manufacturing method thereof.
- the manufacturing method according to the present disclosure includes a first member having a first connecting portion and a linearly extending side, a second member having a second connecting portion, a first member and a second member. And an adhesive layer disposed between the first connection portion and the second connection portion, the semiconductor device having the adhesive layer disposed between the first connection portion and the second connection portion.
- a manufacturing method includes a laminating step of preparing a laminated body in which a first member, an adhesive layer, and a second member are laminated in this order, and a thickness direction with respect to the laminated body. And a pressing step of irradiating a laser beam for heating the laminated body in a state where a pressing force is applied to the laminated body, in the pressing step, from the peripheral portion of one side of the first member to the peripheral portion of the other end.
- a laser is irradiated to the laminated body so that the laser irradiation portion, the laser non-irradiation portion, and the laser irradiation portion are formed in this order.
- the corners of the first member (for example, a square or rectangular semiconductor chip) having the linearly extending sides are the laser irradiation parts, and the spaces between them are the laser non-irradiation parts.
- the corner can be locally heated by the laser, the coverage at the corner of the first member can be secured, and the fillet on the side of the first member can be suppressed.
- a manufacturing method includes a laminating step of preparing a laminated body in which a first member, an adhesive layer and a second member are laminated in this order, and a thickness direction with respect to the laminated body.
- the side of the semiconductor chip is divided into three equal parts and divided into nine areas, and the area including one corner of the semiconductor chip is defined as area 1 among the nine areas, and the area 1 extends along the peripheral edge of the semiconductor chip.
- the average temperature Tc of the outer surface of the semiconductor chip in the central portions of the areas 1, 3, 5, and 7, and the semiconductor in the central portions of the areas 2, 4, 6, and 8 The difference (Tc ⁇ Ts) from the average temperature Ts of the outer surface of the chip is 15 ° C. or more.
- the manufacturing method according to the second embodiment by locally increasing the temperature of the corners (areas 1, 3, 5, 7) of the semiconductor chip, it is possible to secure the coverage in the corners of the first member. In addition, fillets on the sides of the first member are suppressed.
- the areas 2, 4, 6, 8 when the laminate is heated by laser irradiation, may or may not be the laser non-irradiated portion.
- the areas 2, 4, 6, and 8 may be irradiated with laser irradiation having an energy amount smaller than that of the areas 1, 3, 5, and 7.
- the second member examples include a wiring board, a semiconductor chip, and a semiconductor wafer.
- the adhesive layer contains, for example, a thermosetting resin having a weight average molecular weight of less than 10,000 and a curing agent, and may further contain a polymer component having a weight average molecular weight of 10,000 or more. ..
- the adhesive layer is preferably a film adhesive from the viewpoint of improving the efficiency of the pressure bonding step.
- the present disclosure provides a semiconductor device manufactured by the above manufacturing method.
- the fillet on the side of the semiconductor chip is short and the coverage is secured. Due to these characteristics, high-density mounting is possible and excellent reliability is achieved.
- a semiconductor device in which the fillet on the side of the semiconductor chip is small and coverage is secured, and a manufacturing method thereof.
- FIG. 1 is a sectional view schematically showing an embodiment of a semiconductor device according to the present disclosure.
- FIG. 2A is a cross-sectional view schematically showing a state in which preparation for carrying out the pressure bonding step is completed, and
- FIG. 2B schematically shows a laminated body in which a semiconductor chip, an adhesive layer and a substrate are laminated in this order.
- FIG. 2C is a cross-sectional view schematically showing a state in which the pressure-bonding step is performed on the laminated body.
- FIG. 3 is a top view schematically showing an example of a region for irradiating the laminated body with laser in the pressure bonding step.
- FIG. 1 is a sectional view schematically showing an embodiment of a semiconductor device according to the present disclosure.
- FIG. 2A is a cross-sectional view schematically showing a state in which preparation for carrying out the pressure bonding step is completed
- FIG. 2B schematically shows a laminated body in which a semiconductor chip, an adhesive layer and
- FIG. 4 is a top view schematically showing an example of a state in which the adhesive layer protrudes from the semiconductor chip after the pressure bonding step.
- FIG. 5 is a sectional view schematically showing an example of a semiconductor device manufactured by the TSV technique.
- FIG. 6A is a top view schematically showing laser irradiation patterns in Example 1 and Comparative Example 1
- FIG. 6B schematically shows laser irradiation patterns in Example 2 and Comparative Example 2. It is a top view shown.
- FIG. 7 is a top view schematically showing laser irradiation patterns in Examples 3 and 4.
- a semiconductor device 50 shown in FIG. 1 includes a semiconductor chip 10 (first member) having a copper pillar 10a and a solder bump 10b (first connecting portion), and a substrate 20 (having a wiring 20a (second connecting portion)).
- the second member) and the adhesive layer 30 arranged between the semiconductor chip 10 and the substrate 20, and the solder bumps 10b and the wirings 20a are electrically connected.
- the solder bump 10b contains, for example, a tin-silver alloy.
- the surface of the wiring 20a is plated with gold, for example. By heating to a temperature higher than the melting point of the solder, the solder bump 10b and the wiring 20a can be connected.
- a method of manufacturing the semiconductor device 50 will be described with reference to FIGS. 2A to 2C.
- the semiconductor device 50 is manufactured, for example, through the following steps.
- An adhesive-attached chip manufacturing step of preparing a chip having an adhesive layer 30 formed on the surface of the semiconductor chip 10 on which the copper pillars 10a and the solder bumps 10b are formed (see FIG. 2A).
- a laminating step of preparing a laminated body 40 in which the semiconductor chip 10, the adhesive layer 30, and the substrate 20 are laminated in this order see FIG. 2B.
- a pressure bonding step of irradiating the laminated body 40 with a laser L for heating while applying a pressing force F to the laminated body 40 in the thickness direction (see FIG. 2C).
- a curing process of heating the laminated body 40 after the pressure bonding process.
- the step of producing a chip with an adhesive is a step of producing a chip (chip with an adhesive) having the semiconductor chip 10 and the adhesive layer 30 formed so as to cover the copper pillars 10a and the like of the semiconductor chip 10. From the standpoint of workability, it is preferable to prepare a film-like adhesive in advance and to produce the chip with the adhesive through a step of laminating the film-like adhesive on an object. Lamination can be performed by hot pressing, roll laminating, vacuum laminating and the like. The size and thickness of the adhesive layer 30 may be appropriately set according to the size of the semiconductor chip 10, the bump height, and the like.
- a chip with an adhesive may be produced by pasting a film adhesive cut to the size of the semiconductor chip 10 onto the semiconductor chip, or a film adhesive may be applied to a semiconductor wafer on which wirings and the like are formed. After adhering, the chips with adhesive may be produced by dicing into individual pieces. When a chip with an adhesive is produced by dicing, the semiconductor chip 10 and the adhesive layer 30 have the same shape and size.
- the laminating step is a step of preparing a laminated body 40 in which the semiconductor chip 10, the adhesive layer 30, and the substrate 20 are laminated in this order. After the chip with the adhesive and the substrate 20 are aligned with each other, the chip with the adhesive and the substrate 20 are temporarily pressure-bonded to each other to produce the laminated body 40.
- a normal crimping device can be used for the temporary crimping.
- FIG. 3 is a top view schematically showing a region where a laser is applied to the laminated body in the pressure bonding step.
- a laser bonder that can independently irradiate heating lasers on a total of 36 regions is used.
- An example of a laser bonder having such performance is FDB250 manufactured by Shibuya Industry Co., Ltd.
- the area irradiated with the laser is represented by a hatched circle, and the area not irradiated with the laser is represented by a white circle.
- laser irradiation is performed from the peripheral portion (one corner C) of one end Sa of the side S of the semiconductor chip 10 to the peripheral portion (the other corner C) of the other end Sb.
- the layer 40 is irradiated with a laser so that the portion A1, the laser non-irradiation portion A2, and the laser irradiation portion A1 are formed in this order.
- the remaining three sides S of the semiconductor chip 10 are also irradiated with laser so that the laser irradiation part A1, the laser non-irradiation part A2, and the laser irradiation part A1 are formed in this order from one end to the other end. As shown in FIG.
- the side of the semiconductor chip 10 is divided into three equal parts and divided into nine areas, and an area including one corner of the semiconductor chip 10 is defined as an area 1 among the nine areas. Areas arranged from 1 to along the peripheral edge of the semiconductor chip 10 are referred to as areas 2 to 8.
- the areas 1, 3, 5, 7 are selectively irradiated with the laser L, and the areas 2, 4, 6, 8 and the area 9 including the center of the semiconductor chip 10 are not irradiated with the laser. That is, areas 1, 3, 5, and 7 are laser irradiation portions A1, and areas 2, 4, 6, 8, and 9 are laser non-irradiation portions A2.
- the outer surface of the semiconductor chip 10 may be directly irradiated with the laser, or the semiconductor chip 10 may be irradiated with the laser L.
- a plate (not shown) for applying the pressing force F may be irradiated with a laser.
- the difference (Tc ⁇ Ts) from the average temperature Ts is preferably 15 ° C. or more.
- Tc-Ts is 15 ° C. or higher means that the area including the corner of the semiconductor chip 10 is locally heated to a temperature higher than the other areas. By performing such heating in the pressure bonding step, the fillet on the side S of the semiconductor chip 10 can be shortened and the coverage can be secured.
- Tc-Ts may be 15-30 ° C.
- the temperature difference between the average temperature Ts of the outer surface of the semiconductor chip 10 in the central portions of the areas 2, 4, 6, and 8 and the temperature T9 of the outer surface of the semiconductor chip 10 in the central portion of the area 9 may be 5 ° C or higher.
- the fact that Ts-T9 is 5 ° C. or higher means that the areas 2, 4, 6, 8 of the semiconductor chip 10 are heated so as to have a higher temperature than the area 9. That is, in the pressure bonding step of this embodiment, heating is performed so that the condition of Tc> Ts> T9 is satisfied, the temperature difference (Tc-Ts) is 15 ° C. or more, and the temperature difference (Ts-T9) is 5 ° C. or more. You may.
- the temperature difference (Ts-T9) may be in the range of 5-40 ° C.
- the crimping tool surface is brought into contact with the surface of the laminated body 40, and a pressing force F is applied to the laminated body 40. In this state, the surface of the crimping tool is heated.
- the crimping tool surface is usually designed so that its surface temperature is as uniform as possible. For example, when the size of the semiconductor chip is about 30 mm ⁇ 30 mm, the temperature variation on the surface of the semiconductor chip during pressure bonding is usually less than 15 ° C.
- the fillet width in the central portion of the side of the semiconductor chip tends to be large and the coverage tends to be insufficient. It should be noted that if the heating temperature is increased or the pressing force is increased in order to secure the coverage, the fillet width on the side of the semiconductor chip is further increased.
- the present embodiment it is possible to suppress the fillet width and ensure the coverage by intentionally providing the temperature distribution on the surface of the crimping tool.
- the areas 1, 3, 5, 7 of the semiconductor chip to a high temperature, it is possible to enhance the flow of the adhesive layers 30 respectively located at the corners C of the semiconductor chip 10, and to improve the coverage. Can be secured.
- the flow of the adhesive layer 30 near the center of the side S of the semiconductor chip 10 can be relatively suppressed. Therefore, the fillet on the side S can be reduced.
- the temperature rising rate of the entire semiconductor chip tends to increase.
- the temperature rising rate it becomes easier to locally heat a specific area of the semiconductor chip, and it becomes easier to secure coverage while suppressing fillets.
- the temperature rising rate is increased, the time for melting the solder is lengthened, which facilitates connection. This makes it possible to manufacture a highly reliable semiconductor device in a short time.
- FIG. 4 is a top view schematically showing a state where the adhesive layer 30 protrudes from the semiconductor chip 10.
- the width W F shown in FIG. 4 is the maximum width of the fillet on the side S of the semiconductor chip 10.
- the maximum width of the fillet is measured on the four sides S of the semiconductor chip 10, and the average value is defined as the fillet width on the side of the semiconductor chip 10.
- the widths w1 and w2 shown in FIG. 4 are the width ( ⁇ m) of the fillet at a position 200 ⁇ m from the corner C of the semiconductor chip 10.
- the widths w1 and w2 of the four corners C of the semiconductor chip 10 are measured, and the average of the eight values is defined as the coverage ( ⁇ m) of the semiconductor chip 10.
- the fillet width depends on the size and thickness of the semiconductor chip 10 and the amount of underfill (including liquid and film) supplied.
- the fillet width is preferably as small as possible so long as there is no problem in reliability.
- the fillet width is preferably 50 to 200 ⁇ m, more preferably 50 to 150 ⁇ m.
- the coverage of the semiconductor chip 10 is preferably 5 to 100 ⁇ m, more preferably 10 to 100 ⁇ m. If the coverage is 10 ⁇ m or more, the reliability of the semiconductor device 50 tends to be further improved.
- the coverage index (dimensionless) is calculated by dividing the coverage by the fillet width.
- the coverage index is, for example, 0.1 to 1, and may be 0.2 to 0.5. If the coverage index is 0.1 or more, the reliability of the semiconductor device 50 tends to be sufficiently high.
- the curing process is a process of heating the laminated body 40 after the pressure bonding process. From the viewpoint of reducing voids, this step is preferably performed in a pressurized atmosphere using a pressure oven or pressure reflow device.
- the heating temperature is, for example, 130 to 200 ° C.
- the pressure is, for example, 0.1 to 1 MPa.
- a laser bonder is used in the pressure bonding step and heating is performed so that Tc-Ts is 15 ° C. or higher.
- a temperature other than the laser bonder is used.
- a crimping device may be used.
- a pressure bonding tool having a convex portion at a position corresponding to the corner C may be used so that the temperature is easily transmitted only to the corner C of the semiconductor chip 10.
- a crimping tool in which a region corresponding to the corner C of the semiconductor chip 10 is locally made of a material having high thermal conductivity may be used, or a portion other than the region may be made of a material having low thermal conductivity. You may use the crimping tool comprised by.
- the case where the areas 2, 4, 6, and 8 are not irradiated with the laser is exemplified, but the areas 2, 4, 6, and 8 are irradiated with the laser as long as Tc-Ts can be set to 15 ° C. or higher. Alternatively (see Examples 3 and 4).
- the semiconductor device 50 having the connecting portion between the semiconductor chip 10 and the substrate 20 is exemplified, but a mode in which the semiconductor chip and another semiconductor chip are connected may be used, and the semiconductor chip and the semiconductor wafer may be connected. It may be a modified mode.
- the connection portion is not limited to the metal connection by the bump and the wiring, but may be the metal connection by the bump and the bump.
- FIG. 5 is a sectional view schematically showing an example of a semiconductor device manufactured by the TSV technique.
- a semiconductor device 70 shown in this figure has three semiconductor chips 11, 12 and 13 which are flip-chip connected and laminated via an adhesive layer 30, and an interface which is connected to the semiconductor chip 13 via the adhesive layer 30. And a poser 60.
- the semiconductor chips 11, 12, 13 have penetrating electrode portions 11a, 12a, 13a. According to the semiconductor device 70 having such a configuration, signals can be exchanged from the back surface of the semiconductor chip.
- the wiring can be vertically passed in the semiconductor chip, the semiconductor chips or the chip and the interposer can be flexibly connected to each other in the shortest distance.
- the crimping step according to the present embodiment may be applied to the manufacture of a laminated chip including the semiconductor chips 11, 12, and 13, or may be applied to the laminated chip, the interposer 60, and the pressure bonding.
- the semiconductor chip has sides that extend linearly, and has, for example, a square or rectangular shape.
- the length of one side of the semiconductor chip is, for example, 0.1 to 300 mm, and may be 5 to 150 mm.
- the semiconductor constituting the semiconductor chip is not particularly limited, and elemental semiconductors such as silicon and germanium and compound semiconductors such as gallium arsenide and indium phosphide can be cited.
- the semiconductor chip can have conductive protrusions called bumps.
- the bump contains gold, silver, copper, solder, tin, nickel, etc. as main components. These metals may be used alone or in combination of two or more. Further, it may be formed to have a structure in which these metals are laminated.
- the main component of solder is, for example, an alloy of tin-silver, tin-lead, tin-bismuth, tin-copper, tin-silver-copper, or the like.
- the bumps may be formed on a wiring board or the like connected to the semiconductor chip. As the metal forming the bumps, copper and solder are preferable from the viewpoint of low cost, and solder is more preferable from the viewpoint of connection reliability and suppression of warpage.
- the semiconductor chip and wiring board can have a conductive surface called a pad.
- the pad contains gold, silver, copper, solder, tin, nickel, etc. as a main component. These metals may be used alone or in combination of two or more. Further, it may be formed to have a structure in which these metals are laminated.
- the main component of solder is, for example, an alloy of tin-silver, tin-lead, tin-bismuth, tin-copper, tin-silver-copper, or the like. Further, as the metal forming the pad, gold and solder are preferable from the viewpoint of connection reliability.
- the wiring board is not particularly limited as long as it is a normal circuit board, and one having a wiring pattern formed on the insulating substrate by etching, one having a wiring pattern formed by printing a conductive substance on the surface of the insulating substrate, etc. Can be mentioned.
- the insulating substrate is made of a resin material such as glass epoxy, polyester, ceramic, epoxy, bismaleimide triazine, and polyimide.
- the -A metal layer may be formed on the surface of the wiring pattern.
- the metal layer contains gold, silver, copper, solder, tin, nickel, etc. as a main component. These metals may be used alone or in combination of two or more. Further, it may be formed to have a structure in which these metals are laminated.
- copper and solder are preferable from the viewpoint of low cost, and solder is more preferable from the viewpoint of connection reliability and suppression of warpage.
- the semiconductor device may have the above-mentioned bump-bump connecting portion, bump-pad connecting portion, or bump-wiring connecting portion.
- the adhesive layer preferably has excellent heat resistance so that it can be subjected to pressure bonding at a temperature of 200 ° C. or higher.
- a metal such as solder can be melted by performing a pressure bonding process under a temperature condition of 200 ° C. or higher.
- the adhesive layer contains a resin component having a weight average molecular weight of less than 10,000 from the viewpoint of suppressing the generation of voids.
- the adhesive layer may further contain a polymer component having a weight average molecular weight of 10,000 or more.
- the adhesive layer is preferably a film adhesive from the viewpoint of improving the efficiency of the pressure bonding step.
- the "weight average molecular weight" used herein means a value measured in terms of polystyrene by using high performance liquid chromatography (C-R4A manufactured by Shimadzu Corporation).
- component (a) Resin component having a weight average molecular weight of less than 10,000
- the resin component having a weight average molecular weight of less than 10,000 includes an epoxy resin and an acrylic resin.
- the component (a) is preferably a thermosetting resin, and in this case, the adhesive layer preferably contains the curing agent (b). Since a resin component having a relatively small molecular weight decomposes upon heating and causes voids, it is preferable to react with a curing agent from the viewpoint of heat resistance.
- the epoxy resin is not particularly limited as long as it has two or more epoxy groups in the molecule, and examples thereof include bisphenol A type, bisphenol F type, naphthalene type, phenol novolac type, cresol novolak type, phenol aralkyl type, biphenyl. Type, triphenylmethane type, dicyclopentadiene type, and various polyfunctional epoxy resins can be used. These can be used alone or in combination of two or more.
- the content of the epoxy resin is, for example, 10 to 50 parts by mass with respect to 100 parts by mass of the total mass of the adhesive layer.
- the content of the epoxy resin is 10 parts by mass or more, it is easy to control the flow of the resin after curing, and when it is 50 parts by mass or less, the warpage of the package can be suppressed.
- the acrylic resin is not particularly limited as long as it has at least one acryloyl group in the molecule, and examples thereof include bisphenol A type, bisphenol F type, naphthalene type, phenol novolac type, cresol novolac type, phenol aralkyl type, biphenyl type. , Triphenylmethane type, dicyclopentadiene type, fluorene type, adamantane type, and various polyfunctional acrylics can be used. These can be used alone or in combination of two or more.
- the content of the acrylic resin is preferably 10 to 50 parts by mass, more preferably 15 to 40 parts by mass with respect to 100 parts by mass of the total mass of the adhesive layer.
- the content of the acrylic resin is 10 parts by mass or more, it is easy to control the flow of the resin after curing, and when it is 50 parts by mass or less, the warpage of the package can be suppressed.
- the acrylic resin is preferably solid at room temperature (25 ° C). Voids are less likely to occur in the solid form than in the liquid form, and the viscosity (tack) of the adhesive layer before curing (B stage) is small and the handling is excellent.
- the number of functional groups of the acryloyl group is preferably 3 or less. When the number of functional groups of the acryloyl group is 3 or less, curing sufficiently progresses in a short time and a sufficiently high curing reaction rate can be achieved.
- (B) Curing agent examples include a phenol resin curing agent, an acid anhydride curing agent, an amine curing agent, an imidazole curing agent, a phosphine curing agent, an azo compound and an organic peroxide. ..
- the phenol resin-based curing agent is not particularly limited as long as it has two or more phenolic hydroxyl groups in the molecule, for example, phenol novolac, cresol novolac, phenol aralkyl resin, cresol naphthol formaldehyde polycondensate, triphenyl.
- Methane-type polyfunctional phenols and various polyfunctional phenol resins can be used. These can be used alone or as a mixture of two or more kinds.
- the equivalent ratio of the phenol resin type curing agent to the epoxy resin is preferably 0.3 to 1.5, from the viewpoint of good curability, adhesiveness and storage stability, and 0 0.4 to 1.0 is more preferable, and 0.5 to 1.0 is further preferable.
- the equivalent ratio is 0.3 or more, the curability and the adhesive strength tend to be improved, and when it is 1.5 or less, the unreacted phenolic hydroxyl group does not remain excessively and the water absorption is It tends to be kept low and the insulation reliability tends to be improved.
- acid anhydride curing agent for example, use methylcyclohexanetetracarboxylic dianhydride, trimellitic anhydride, pyromellitic dianhydride, benzophenonetetracarboxylic dianhydride and ethylene glycol bisanhydrotrimellitate. You can These can be used alone or as a mixture of two or more kinds.
- the equivalent ratio of the acid anhydride type curing agent to the epoxy resin is preferably 0.3 to 1.5 from the viewpoint of good curability, adhesiveness and storage stability. , 0.4 to 1.0 are more preferable, and 0.5 to 1.0 are still more preferable. If the equivalent ratio is 0.3 or more, the curability and the adhesive strength tend to be improved, and if it is 1.5 or less, the unreacted acid anhydride does not remain excessively and the water absorption is It tends to be kept low and the insulation reliability tends to be improved.
- amine-based curing agent for example, dicyandiamide can be used.
- the equivalent ratio (amine / epoxy group, molar ratio) of the amine-based curing agent to the epoxy resin is preferably 0.3 to 1.5, and 0.4 to 1 from the viewpoint of good curability, adhesiveness and storage stability. 0.0 is more preferable, and 0.5 to 1.0 is still more preferable.
- the equivalent ratio is 0.3 or more, the curability and the adhesive strength tend to be improved, and when it is 1.5 or less, unreacted amine does not remain excessively and the insulation reliability is improved. Tend to do.
- imidazole type curing agent examples include 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole.
- 1-cyanoethyl-2-undecylimidazole, 1-cyano-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole trimellitic acid from the viewpoint of excellent curability, storage stability and connection reliability.
- Tate 1-cyanoethyl-2-phenylimidazolium trimellitate, 2,4-diamino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine, 2,4-diamino-6- [2′-Ethyl-4′-methylimidazolyl- (1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2′-methylimidazolyl- (1 ′)]-ethyl-s-triazine Isocyanuric acid adduct, 2-phenylimidazole Isocyanuric acid adduct, 2-phenyl-4,5-dihydroxymethylimidazole and 2-phenyl -4-Methyl-5-hydroxymethylimidazole is preferred. These can be used alone or in combination of two or more. Further, these may be microencapsulated latent curing agents.
- the content of the imidazole-based curing agent is preferably 0.1 to 20 parts by mass, more preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the epoxy resin.
- the content of the imidazole-based curing agent is 0.1 parts by mass or more, the curability tends to be improved, and when it is 20 parts by mass or less, the adhesive composition may be cured before the metal bond is formed. No connection failure tends to occur.
- phosphine curing agent examples include triphenylphosphine, tetraphenylphosphonium tetraphenylborate, tetraphenylphosphonium tetra (4-methylphenyl) borate and tetraphenylphosphonium (4-fluorophenyl) borate.
- the content of the phosphine-based curing agent is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the epoxy resin.
- the content of the phosphine-based curing agent is 0.1 part by mass or more, the curability tends to be improved, and when it is 10 parts by mass or less, the adhesive composition may be cured before the metal bond is formed. No connection failure tends to occur.
- Each of the phenolic resin-based curing agent, the acid anhydride-based curing agent and the amine-based curing agent may be used alone or in combination of two or more kinds.
- the imidazole-based curing agent and the phosphine-based curing agent may be used alone, or may be used together with a phenol resin-based curing agent, an acid anhydride-based curing agent or an amine-based curing agent.
- organic peroxides examples include ketone peroxides, peroxyketals, hydroperoxides, dialkyl peroxides, diacyl peroxides, peroxydicarbonates, and peroxyesters. From the viewpoint of storage stability, hydroperoxide, dialkyl peroxide and peroxy ester are preferable. Further, from the viewpoint of heat resistance, hydroperoxide and dialkyl peroxide are preferable. These may be used alone or in combination of two or more.
- the content of the peroxide is preferably 0.5 to 10% by mass, more preferably 1 to 5% by mass based on the mass of the acrylic resin.
- the content of peroxide is 0.5% by mass or more, the curing reaction easily proceeds sufficiently, while when it is 10% by mass or less, the molecular chain is shortened or unreacted groups remain. However, it is possible to sufficiently suppress the decrease in reliability.
- the combination of the epoxy resin, the acrylic resin and the curing agent is not particularly limited as long as the curing proceeds, but from the viewpoint of handleability, storage stability and curability, phenol and imidazole are used as the curing agent together with the epoxy resin. It is preferable to use acid anhydride and imidazole, amine and imidazole, or imidazole alone. It is more preferable to use imidazole, which is excellent in quick-curing property, alone because the productivity is improved when connecting in a short time. Curing in a short time can suppress volatile components such as low-molecular components, so that the generation of voids is further suppressed. From the viewpoint of handleability and storage stability, it is preferable to use an organic peroxide as a curing agent used together with the acrylic resin.
- (C) Polymer component having a weight average molecular weight of 10,000 or more As the polymer component having a weight average molecular weight of 10,000 or more (hereinafter referred to as "(c) component"), epoxy resin, phenoxy resin, polyimide resin, polyamide resin, polycarbodiimide resin , Cyanate ester resin, acrylic resin, polyester resin, polyethylene resin, polyether sulfone resin, polyetherimide resin, polyvinyl acetal resin, urethane resin, acrylic rubber, bismaleimide resin, and the like. Of these, epoxy resins, phenoxy resins, polyimide resins, acrylic resins, acrylic rubbers, and bismaleimide resins, which have excellent heat resistance and film forming properties, are more preferable. These may be used alone or in combination of two or more, and may be used as a copolymer of two or more.
- the mass ratio of the component (c) and the epoxy resin is not particularly limited, but when the amount of the component (c) in the adhesive layer is 100 parts by mass, the mass of the epoxy resin may be 1 to 500 parts by mass. It is preferably 5 to 400 parts by mass, more preferably 10 to 300 parts by mass. When the amount of the epoxy resin is 1 part by mass or more, it is easy to secure sufficient adhesive force, and when it is 500 parts by mass or less, it is easy to secure sufficient film formability and film formability.
- the epoxy resin mentioned here is a curing component having a glycidyl group and a molecular weight of less than 10,000.
- the mass ratio of the component (c) and the acrylic resin is not particularly limited, but when the amount of the component (c) in the adhesive layer is 100 parts by mass, the mass of the acrylic resin is 1 to 1000 parts by mass.
- the amount is preferably 5 to 500 parts by mass, more preferably 10 to 500 parts by mass.
- the amount of the acrylic resin is 1 part by mass or more, it is easy to secure sufficient adhesive force, and when it is 1000 parts by mass or less, it is easy to secure sufficient film formability.
- the glass transition temperature (Tg) of the component (c) is preferably 50 to 200 ° C. from the viewpoint of excellent adhesion of the adhesive layer to the substrate and semiconductor chip.
- Tg of the component (c) is 50 ° C. or higher, the tack (viscosity) force of the adhesive layer can be sufficiently increased and the handleability is excellent.
- the Tg of the component (c) is 200 ° C. or less, bumps formed on the semiconductor chip or irregularities such as electrodes or wiring patterns formed on the substrate are easily embedded in the adhesive layer, and voids are generated. Can be suppressed.
- the Tg of the adhesive layer means a value measured using a DSC (DSC-7 type manufactured by Perkin Elmer Co., Ltd.) under the conditions of a sample amount of 10 mg, a heating rate of 10 ° C./minute, and a measurement atmosphere of air. ..
- the weight average molecular weight of the component (c) is 10,000 or more in terms of polystyrene, but it is preferably 30,000 or more from the standpoint of achieving good film-forming property by itself.
- the weight average molecular weight of the component (c) is 10,000 or more, it is easy to achieve sufficient film forming property.
- the adhesive layer may further contain a flux agent.
- the flux agent is a compound exhibiting flux activity (activity for removing oxides or impurities).
- the fluxing agent include nitrogen-containing compounds having a non-covalent electron pair such as imidazoles and amines, carboxylic acids, phenols and alcohols.
- the organic acid more strongly develops the flux activity than the alcohol or the like, and the connectivity is improved.
- organic acids it is preferable to use carboxylic acid. Since the carboxylic acid reacts with the epoxy resin, there is an advantage that the amount remaining in the adhesive layer is sufficiently small.
- the carboxylic acid as the flux agent is preferably solid.
- the melting point of the flux agent is preferably 70 to 150 ° C.
- the adhesive layer may further contain a filler having an insulating property.
- a filler having an insulating property include inorganic fillers, whiskers and resin fillers. From the viewpoint of insulation reliability, it is preferable that the adhesive layer does not contain a conductive metal filler (for example, silver particles and solder particles).
- inorganic fillers examples include glass, silica, alumina, titanium oxide, carbon black, mica and boron nitride. Of these, silica, alumina, titanium oxide and boron nitride are preferable, and silica, alumina and boron nitride are more preferable.
- whiskers include aluminum borate, aluminum titanate, zinc oxide, calcium silicate, magnesium sulfate, and boron nitride.
- the resin filler examples include polyurethane, polyimide, methyl methacrylate resin, and methyl methacrylate-butadiene-styrene copolymer resin (MBS). These fillers may be used alone or in combination of two or more.
- the resin filler can give flexibility to the adhesive layer under a high temperature environment (for example, 260 ° C.) as compared with the inorganic filler, it can contribute to the improvement of reflow resistance. By improving the flexibility, the film forming property can also be improved.
- a surface-treated filler may be used. By subjecting the filler to a surface treatment, the physical properties of the filler can be adjusted appropriately.
- the surface treatment include glycidyl (epoxy), amine, phenyl, phenylamino, acryl (methacryl) or vinyl treatment. From the viewpoint of dispersibility, fluidity and adhesive strength, glycidyl type, phenylamino type and acryl (methacryl) type are preferable. From the viewpoint of storage stability, phenyl type and acrylic (methacrylic) type are more preferable. From the viewpoint of ease of surface treatment, silane treatment such as epoxysilane-based, aminosilane-based, and acrylsilane-based is preferable.
- the average particle size of the filler is preferably 1.5 ⁇ m or less from the viewpoint of preventing biting during flip chip connection, and more preferably 1.0 ⁇ m or less from the viewpoint of visibility (transparency).
- the "average particle size” as used herein means a value obtained by analyzing with a laser diffraction particle size distribution analyzer using MEK (methyl ethyl ketone) as a solvent.
- the content of the filler is preferably 30 to 90% by mass, and more preferably 40 to 80% by mass, based on the mass of the solid content of the adhesive layer.
- the content of the filler is 30% by mass or more, sufficient heat dissipation can be easily achieved, and voids can be formed and the moisture absorption rate can be reduced.
- the content of the filler is 90% by mass or less, it is possible to suppress the viscosity from becoming excessively high, to ensure sufficiently high fluidity, and to sufficiently trap (fill) the filler into the connection portion. Can be suppressed to.
- the adhesive layer may further contain additives such as an ion trapper, an antioxidant, a silane coupling agent, a titanium coupling agent and a leveling agent. These may be used alone or in combination of two or more. The content of these additives may be appropriately adjusted so that the effect of each additive is exhibited.
- additives such as an ion trapper, an antioxidant, a silane coupling agent, a titanium coupling agent and a leveling agent.
- the film adhesive can be produced as follows. That is, the above components are added to an organic solvent, and the mixed solution is stirred or kneaded to prepare a varnish. After the varnish is applied on the base material film that has been subjected to the mold release treatment, the organic solvent is reduced by heating to form the film adhesive on the base material film.
- the varnish can be applied using, for example, a knife coater, a roll coater, an applicator, a die coater or a comma coater.
- the substrate film is not particularly limited as long as it has heat resistance that can withstand the heating conditions when volatilizing the organic solvent, polyester film, polypropylene film, polyethylene terephthalate film, polyimide film, polyetherimide film, poly Examples include an ether naphthalate film and a methylpentene film.
- the base film is not limited to a single layer made of these films, but may be a multilayer film made of two or more kinds of materials.
- the conditions for volatilizing the organic solvent from the varnish are preferably heating at 50 to 200 ° C. for 0.1 to 90 minutes.
- the content of the organic solvent is preferably reduced to 1.5% by mass or less if there is no influence on generation of voids after mounting or adjustment of viscosity.
- a varnish film is formed on the surface of the semiconductor wafer by spin coating, and then a solvent is added by heating. You can reduce it.
- Example 1 (Preparation of varnish for forming adhesive layer) A varnish was prepared by mixing the following compounds in the proportions shown in Table 1 and degassing in vacuum. MEK was used as the solvent.
- Thermosetting resin epoxy resin having a weight average molecular weight of less than 10,000 -Trifunctional methane skeleton-containing polyfunctional solid epoxy (Mitsubishi Chemical Corporation, EP1032H60 (hereinafter referred to as "EP1032”), weight average molecular weight: 800 to 2000)
- -Bisphenol F type liquid epoxy manufactured by Mitsubishi Chemical Corporation, YL983U (hereinafter referred to as "YL983", molecular weight: about 336)
- YL7175 (manufactured by Mitsubishi Chemical Corporation, YL7175-1000 (hereinafter referred to as "YL7175”), weight average molecular weight: 1000 to 5000)
- Curing agent 2,4-diamino-6- [2'-
- a semiconductor chip with a solder bump (WALTS-TEG CC80 (product name), manufactured by Waltz Co., Ltd.) was prepared as a first member.
- the structure of this semiconductor chip was as follows. -Chip size: 7.3 mm x 7.3 mm x 0.05 mmt ⁇ Bump height: approx. 45 ⁇ m (total height of copper pillar and solder) ⁇ Number of bumps: 1048 pins ⁇ Bump pitch: 80 ⁇ m
- An adhesive piece was obtained by cutting the produced film-like adhesive into the same size as the semiconductor chip (7.3 mm ⁇ 7.3 mm). This adhesive piece was laminated on the surface of the semiconductor chip (the surface on which the solder was formed). The lamination was performed using a vacuum laminator V130 (Nikko Materials Co., Ltd.) under the conditions of 80 ° C./0.5 MPa / 60 s.
- a semiconductor chip (WALTS-TEG IP80, manufactured by Waltz Co., Ltd.) was prepared as a second member.
- the structure of this semiconductor chip was as follows. ⁇ Chip size: 10mm ⁇ 10mm ⁇ 0.1mmt -Metal forming the connecting portion: Ni / Au
- the semiconductor chip with solder bumps was placed on the surface of the semiconductor chip (second member) on the side where the connection portion was formed such that the adhesive piece was in contact with this surface. Then, after performing a temporary pressure bonding step using a pressure bonding device (FCB3, manufactured by Panasonic Corporation), a pressure bonding step was performed using a laser bonder (FDB250, manufactured by Shibuya Industry Co., Ltd.). The temporary pressure bonding step was carried out under the condition of 80 ° C./25 N / 1 s. The crimping process was performed under the following conditions. ⁇ Crimping pressure: 30N -Pressing time: 1 second-Laser irradiation pattern: Fig.
- a pressure oven device (VSU28, manufactured by Shin Apex Co., Ltd.) was used to perform the curing process under the conditions of 175 ° C./10 min / 0.4 MPa and a heating rate of 20 ° C./min.
- VSU28 manufactured by Shin Apex Co., Ltd.
- a semiconductor device according to this example was obtained through this curing process.
- Example 2 A semiconductor device was manufactured in the same manner as in Example 1 except that the pressure bonding step was performed under the following conditions.
- Example 1 A semiconductor device was manufactured in the same manner as in Example 1 except that the pressure bonding step was performed under the following conditions. ⁇ Crimping pressure: 30N ⁇ Crimping time: 1 second ⁇ Laser irradiation pattern: Fig.
- ⁇ Comparative example 2> A semiconductor device was manufactured in the same manner as in Example 2 except that the pressure bonding step was performed under the following conditions. ⁇ Crimping pressure: 30N -Pressing time: 3 seconds-Laser irradiation pattern: Fig. 6 (b) (irradiated with a laser having a weaker intensity than in Comparative Example 1).
- Example 3 A semiconductor device was manufactured in the same manner as in Example 1 except that the pressure bonding step was performed under the following conditions. After the pressure-bonding step, a curing oven was used under the same conditions as in Example 1 using a pressure oven device (PCOA-01, manufactured by NTT Advance Technology Co., Ltd.). ⁇ Crimping pressure: 30N ⁇ Crimping time: 1 second ⁇ Laser irradiation pattern: Fig. 7 (Areas 1, 3, 5, 7 are irradiated with a laser output of 100% and areas 2, 4, 6, 8 are irradiated with a laser of 10%.
- Example 4 A semiconductor device was manufactured in the same manner as in Example 3 except that the pressure bonding step was performed under the following conditions. ⁇ Crimping pressure: 30N -Pressing time: 3 seconds-Laser irradiation pattern: Fig.
- the void occurrence rates of the semiconductor devices according to the examples and comparative examples were evaluated by the following method.
- an ultrasonic image diagnostic apparatus (Insight-300, manufactured by Insight Co., Ltd.) was used to take external images of the semiconductor devices according to the examples and comparative examples.
- An image of the adhesive layer on the semiconductor chip was captured with a scanner (GT-9300UF, manufactured by EPSON Corporation). This image was subjected to color tone correction and two-gradation conversion by image processing software (Adobe Photoshop (registered trademark), Adobe Systems Incorporated) to identify the void portion, and the ratio of the void portion to the histogram was calculated.
- the evaluation criteria are as follows. The results are shown in Tables 2 and 3.
- a semiconductor device in which the fillet on the side of the semiconductor chip is small and coverage is secured, and a manufacturing method thereof.
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Abstract
Description
<条件1>
半導体チップの辺を三等分して計九つのエリアに分割し、当該九つのエリアのうち、半導体チップの一つの隅部を含むエリアをエリア1とし、エリア1から半導体チップの周縁部に沿って並ぶエリアをエリア2~8としたとき、エリア1,3,5,7の各中心部における半導体チップの外表面の平均温度Tcと、エリア2,4,6,8の各中心部における半導体チップの外表面の平均温度Tsとの差(Tc-Ts)が15℃以上である。
<条件2>
上記九つのエリアのうち、半導体チップの中心を含むエリアをエリア9とすると、エリア2,4,6,8の各中心部における半導体チップの外表面の平均温度Tsと、エリア9の中心部における半導体チップの外表面の温度T9との差(Ts-T9)が5℃以上である。
図1に示す半導体装置50は、銅ピラー10a及びはんだバンプ10b(第一の接続部)を有する半導体チップ10(第一の部材)と、配線20a(第二の接続部)を有する基板20(第二の部材)と、半導体チップ10と基板20との間に配置された接着剤層30とを備え、はんだバンプ10bと配線20aが電気的に接続されている。はんだバンプ10bは、例えば、スズ-銀合金を含む。配線20aは、例えば、表面に金メッキが施されている。はんだの融点よりも高い温度に加熱することで、はんだバンプ10bと配線20aとを接続することができる。
・半導体チップ10の銅ピラー10a及びはんだバンプ10bが形成されている側の面に接着剤層30が形成されたチップを準備する接着剤付きチップ作製工程(図2(a)参照)。
・半導体チップ10、接着剤層30及び基板20がこの順序で積層された積層体40を準備する積層工程(図2(b)参照)。
・積層体40に対して厚さ方向に押圧力Fを加えた状態で、積層体40に対して加熱のためのレーザーLを照射する圧着工程(図2(c)参照)。
・圧着工程後の積層体40を加熱するキュア工程。
接着剤付きチップ作製工程は、半導体チップ10と、半導体チップ10の銅ピラー10a等を覆うように形成された接着剤層30とを有するチップ(接着剤付きチップ)を作製する工程である。作業性の観点から、フィルム状接着剤を事前に準備し、これを対象物にラミネートする工程を経て接着剤付きチップを作製することが好ましい。ラミネートは加熱プレス、ロールラミネート及び真空ラミネート等によって行うことができる。接着剤層30のサイズ及び厚さは、半導体チップ10のサイズ及びバンプ高さ等に応じて適宜設定すればよい。なお、半導体チップ10のサイズに切断されたフィルム状接着剤を半導体チップに貼り付けることによって接着剤付きチップを作製してもよいし、あるいは、配線等が形成された半導体ウエハにフィルム状接着剤を貼り付けた後、ダイシングによって個片化することで、接着剤付きチップを作製してもよい。なお、ダイシングによって接着剤付きチップを作製する場合、半導体チップ10と接着剤層30は同じ形状及びサイズとなる。
積層工程は、半導体チップ10、接着剤層30及び基板20がこの順序で積層された積層体40を準備する工程である。接着剤付きチップと基板20との位置合わせを行った後、接着剤付きチップと基板20とを仮圧着することによって積層体40を作製する。仮圧着には通常の圧着装置を使用することができる。
図3は圧着工程において積層体に対してレーザーを照射する領域を模式的に示す上面図である。本実施形態においては、計36の領域に加熱用のレーザーをそれぞれ独立して照射可能なレーザーボンダを使用する。このような性能を有するレーザーボンダとして、例えば、澁谷工業株式会社製のFDB250が挙げられる。図3において、計36の領域のうち、レーザーが照射された領域をハッチングを付した丸で表し、レーザーが照射されない領域を白い丸で表している。
キュア工程は、圧着工程後の積層体40を加熱する工程である。この工程は、ボイド低減の観点から、加圧オーブン又は加圧リフロ装置を使用し、加圧雰囲気下で実施することが好ましい。加熱温度は、例えば、130~200℃である。圧力は、例えば、0.1~1MPaである。
重量平均分子量10000未満の樹脂成分(以下、(a)成分)としては、エポキシ樹脂及びアクリル樹脂が挙げられる。(a)成分は、熱硬化性樹脂であることが好ましく、この場合、接着剤層は(b)硬化剤を含むことが好ましい。分子量が比較的小さい樹脂成分は加熱時に分解等してボイドの原因となるため、硬化剤と反応する方が耐熱性の観点から好ましい。
硬化剤としては、例えば、フェノール樹脂系硬化剤、酸無水物系硬化剤、アミン系硬化剤、イミダゾール系硬化剤、ホスフィン系硬化剤、アゾ化合物及び有機過酸化物が挙げられる。
フェノール樹脂系硬化剤としては、分子内に二個以上のフェノール性水酸基を有するものであれば特に制限はなく、例えば、フェノールノボラック、クレゾールノボラック、フェノールアラルキル樹脂、クレゾールナフトールホルムアルデヒド重縮合物、トリフェニルメタン型多官能フェノール及び各種多官能フェノール樹脂を使用することができる。これらは単独で又は二種以上の混合物として使用することができる。
酸無水物系硬化剤としては、例えば、メチルシクロヘキサンテトラカルボン酸二無水物、無水トリメリット酸、無水ピロメリット酸、ベンゾフェノンテトラカルボン酸二無水物及びエチレングリコールビスアンヒドロトリメリテートを使用することができる。これらは単独で又は二種以上の混合物として使用することができる。
アミン系硬化剤としては、例えばジシアンジアミドを使用することができる。エポキシ樹脂に対するアミン系硬化剤の当量比(アミン/エポキシ基、モル比)は、良好な硬化性、接着性及び保存安定性の観点から0.3~1.5が好ましく、0.4~1.0がより好ましく、0.5~1.0が更に好ましい。当量比が0.3以上であると、硬化性が向上し接着力が向上する傾向があり、1.5以下であると未反応のアミンが過剰に残存することがなく、絶縁信頼性が向上する傾向がある。
イミダゾール系硬化剤としては、例えば、2-フェニルイミダゾール、2-フェニル-4-メチルイミダゾール、1-ベンジル-2-メチルイミダゾール、1-ベンジル-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾール、1-シアノ-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾールトリメリテイト、1-シアノエチル-2-フェニルイミダゾリウムトリメリテイト、2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-ウンデシルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-エチル-4’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジンイソシアヌル酸付加体、2-フェニルイミダゾールイソシアヌル酸付加体、2-フェニル-4,5-ジヒドロキシメチルイミダゾール、2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾール、及び、エポキシ樹脂とイミダゾール類の付加体が挙げられる。これらの中でも、優れた硬化性、保存安定性及び接続信頼性の観点から、1-シアノエチル-2-ウンデシルイミダゾール、1-シアノ-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾールトリメリテイト、1-シアノエチル-2-フェニルイミダゾリウムトリメリテイト、2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-エチル-4’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジンイソシアヌル酸付加体、2-フェニルイミダゾールイソシアヌル酸付加体、2-フェニル-4,5-ジヒドロキシメチルイミダゾール及び2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾールが好ましい。これらは単独で又は二種以上を併用して用いることができる。また、これらをマイクロカプセル化した潜在性硬化剤としてもよい。
ホスフィン系硬化剤としては、例えば、トリフェニルホスフィン、テトラフェニルホスホニウムテトラフェニルボレート、テトラフェニルホスホニウムテトラ(4-メチルフェニル)ボレート及びテトラフェニルホスホニウム(4-フルオロフェニル)ボレートが挙げられる。
有機過酸化物としては、例えば、ケトンパーオキサイド、パーオキシケタール、ハイドロパーオキサイド、ジアルキルパーオキサイド、ジアシルパーオキサイド、パーオキシジカーボネイト、パーオキシエステルが挙げられる。保存安定性の観点から、ハイドロパーオキサイド、ジアルキルパーオキサイド、パーオキシエステルが好ましい。更に、耐熱性の観点から、ハイドロパーオキサイド、ジアルキルパーオキサイドが好ましい。これらは、一種を単独で又は二種以上を併用しもよい。
重量平均分子量10000以上の高分子成分(以下「(c)成分」という。)としては、エポキシ樹脂、フェノキシ樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリカルボジイミド樹脂、シアネートエステル樹脂、アクリル樹脂、ポリエステル樹脂、ポリエチレン樹脂、ポリエーテルスルホン樹脂、ポリエーテルイミド樹脂、ポリビニルアセタール樹脂、ウレタン樹脂、アクリルゴム、ビスマレイミド樹脂等が挙げられる。これらのうち、耐熱性及びフィルム形成性に優れるエポキシ樹脂、フェノキシ樹脂、ポリイミド樹脂、アクリル樹脂、アクリルゴム、ビスマレイミド樹脂がより好ましい。これらは一種を単独で又は二種以上を併用してもよく、二種以上の共重合体として使用してもよい。
(接着剤層形成用ワニスの調製)
以下の化合物を表1に示す割合で混合するとともに、真空脱気することによってワニスを調製した。なお、溶剤としてMEKを使用した。
(1)重量平均分子量10000未満の熱硬化性樹脂(エポキシ樹脂)
・トリフェノールメタン骨格含有多官能固形エポキシ(三菱ケミカル株式会社製、EP1032H60(以下「EP1032」と表記する。)、重量平均分子量:800~2000)
・ビスフェノールF型液状エポキシ(三菱ケミカル株式会社製、YL983U(以下「YL983」と表記する。)、分子量:約336)
・可とう性半固形状エポキシ(三菱ケミカル株式会社製、YL7175-1000(以下「YL7175」と表記する。)、重量平均分子量:1000~5000)
(2)硬化剤
・2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジンイソシアヌル酸付加体(四国化成工業株式会社製、2MAOK-PW(以下「2MAOK」と表記する。))
(3)重量平均分子量10000以上の高分子成分
・フェノキシ樹脂(東都化成工業株式会社、ZX1356-2(以下「ZX1356」と表記する。)、Tg:約71℃、重量平均分子量:約63000)
(4)フラックス剤(カルボン酸)
・グルタル酸(アルドリッチ社製、融点:約98℃)
(5)樹脂フィラ
・有機フィラ(ロームアンドハースジャパン株式会社製、EXL-2655:コアシェルタイプ有機微粒子)
(6)無機フィラ
・シリカフィラ(株式会社アドマテックス、SE2050、平均粒径:0.5μm)
・メタクリル表面処理ナノシリカフィラ(株式会社アドマテックス、YA050C-SM(以下「SMナノシリカ」表記とする。)、平均粒径:約50nm)
厚さ50μmの表面離型処理ポリエチレンテレフタレートフィルム(帝人フィルムソリューション株式会社製、商品名:テイジンテトロンフィルムA-63)上にワニスを塗工した。乾燥工程を経て、厚さ45μmのフィルム状接着剤を得た。
第一の部材としてのはんだバンプ付き半導体チップ(WALTS-TEG CC80(製品名)、株式会社ウォルツ製)を準備した。この半導体チップの構成は以下のとおりであった。
・チップサイズ:7.3mm×7.3mm×0.05mmt
・バンプ高さ:約45μm(銅ピラー及びはんだの高さの合計)
・バンプ数:1048ピン
・バンプピッチ:80μm
・チップサイズ:10mm×10mm×0.1mmt
・接続部を構成する金属:Ni/Au
・圧着圧力:30N
・圧着時間:1秒
・レーザー照射パターン:図6(a)(エリア1,3,5,7にレーザーを照射した。)
・レーザー照射時間:1秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:235℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:205℃
・エリア9の中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の温度T9:204℃
・温度差(Tc-Ts):30℃
・温度差(Ts-T9):1℃
圧着工程を以下の条件で実施したことの他は、実施例1と同様にして半導体装置を作製した。
・圧着圧力:30N
・圧着時間:3秒
・レーザー照射パターン:図6(a)(実施例1よりも弱い強度のレーザーを照射した。)
・レーザー照射時間:3秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:225℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:200℃
・エリア9の中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の温度T9:200℃
・温度差(Tc-Ts):25℃
・温度差(Ts-T9):0℃
圧着工程を以下の条件で実施したことの他は、実施例1と同様にして半導体装置を作製した。
・圧着圧力:30N
・圧着時間:1秒
・レーザー照射パターン:図6(b)(エリア1,3,5,7にレーザーを照射するとともに、このレーザーよりも弱い強度のレーザーをエリア2,4,6,8に照射した。)
・レーザー照射時間:1秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:225℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:215℃
・温度差(Tc-Ts):10℃
圧着工程を以下の条件で実施したことの他は、実施例2と同様にして半導体装置を作製した。
・圧着圧力:30N
・圧着時間:3秒
・レーザー照射パターン:図6(b)(比較例1よりも弱い強度のレーザーを照射した。)
・レーザー照射時間:3秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:210℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:205℃
・温度差(Tc-Ts):5℃
圧着工程を以下の条件で実施したことの他は、実施例1と同様にして半導体装置を作製した。なお、圧着工程後、加圧オーブン装置(PCOA-01、NTTアドバンステクノロジ株式会社製)を使用し、実施例1と同じ条件でキュア工程を実施した。
・圧着圧力:30N
・圧着時間:1秒
・レーザー照射パターン:図7(エリア1,3,5,7にレーザーを出力100%で照射し、エリア2,4,6,8の外側部分にレーザーを出力10%で照射した。)
・レーザー照射時間:1秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:240℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:211℃
・エリア9の中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の温度T9:205℃
・温度差(Tc-Ts):29℃
・温度差(Ts-T9):6℃
圧着工程を以下の条件で実施したことの他は、実施例3と同様にして半導体装置を作製した。
・圧着圧力:30N
・圧着時間:3秒
・レーザー照射パターン:図7(実施例3よりも弱い強度のレーザーを照射した。)
・レーザー照射時間:3秒
・エリア1,3,5,7の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Tc:230℃
・エリア2,4,6,8の各中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の平均温度Ts:205℃
・エリア9の中心部におけるボンディングツール表面(はんだバンプ付き半導体チップの外表面)の温度T9:200℃
・温度差(Tc-Ts):20℃
・温度差(Ts-T9):5℃
実施例及び比較例に係る半導体装置について以下の評価を行った。
マルチメータ(R6871E、株式会社アドバンテスト製)を使用し、実施例及び比較例に係る半導体装置の初期接続抵抗値を測定し、初期導通性について評価を行った。評価基準は以下のとおりとした。表2及び表3に結果を示す。
A:ペリフェラル部分の初期接続抵抗値が30~35Ωである。
B:ペリフェラル部分の初期接続抵抗値が35Ω超である。
以下の方法により、実施例及び比較例に係る半導体装置のボイド発生率を評価した。まず、超音波映像診断装置(Insight-300、インサイト株式会社製)を使用し、実施例及び比較例に係る半導体装置の外観画像を撮影した。スキャナ(GT-9300UF、EPSON株式会社製)で半導体チップ上の接着剤層の画像を取り込んだ。この画像を画像処理ソフト(Adobe Photoshop(登録商標)、アドビシステムズ株式会社)によって色調補正及び二階調化することによってボイド部分を識別し、ヒストグラムによりボイド部分の占める割合を算出した。評価基準は以下のとおりとした。表2及び表3に結果を示す。
A:半導体チップ上の接着剤部分の面積を基準として、ボイド部分の占める割合が5%以下である。
B:半導体チップ上の接着剤部分の面積を基準として、ボイド部分の占める割合が5%超である。
実施例及び比較例に係る半導体装置をデジタルマイクロスコープ(VHX-5000、株式会社キーエンス製)を用いて上面から観察した。そして、正方形の半導体チップからはみ出している部分(フィレット)の最大値を測定した。半導体チップの四つの辺についてフィレット幅の最大値をそれぞれ測定し、その平均値をフィレット幅とした。表2及び表3に結果を示す。
実施例及び比較例に係る半導体装置をデジタルマイクロスコープ(VHX-5000、株式会社キーエンス製)を用いて上面から観察した。そして、正方形の半導体チップからはみ出している部分(フィレット)の幅であって、半導体チップの角から200μmの位置の二点における幅(カバレッジ)を測定した(図4参照)。半導体チップの四つの角について計八点のカバレッジを測定し、その平均値を算出した。表2及び表3に結果を示す。なお、表2,3に記載の「カバレッジ指数」はカバレッジ(平均値)をフィレット幅(平均値)で除すことによって算出された値である。表中の「-」は未測定であることを意味する。
Claims (9)
- 第一の接続部を有し且つ直線状に延びる辺を有する第一の部材と、
第二の接続部を有する第二の部材と、
前記第一の部材と前記第二の部材との間に配置された接着剤層とを備え、
前記第一の接続部と前記第二の接続部が電気的に接続されている半導体装置の製造方法であって、
前記第一の部材、前記接着剤層及び前記第二の部材がこの順序で積層された積層体を準備する積層工程と、
前記積層体に対して厚さ方向に押圧力を加えた状態で、前記積層体に対して加熱のためのレーザーを照射する圧着工程と、
を含み、
前記圧着工程において、前記第一の部材の前記辺の一端の周縁部から他端の周縁部に向けて、レーザー照射部、レーザー非照射部及びレーザー照射部がこの順序で形成されるように、前記積層体に対してレーザーを照射する、半導体装置の製造方法。 - 前記第一の部材が正方形又は長方形の形状を有する半導体チップである、請求項1に記載の半導体装置の製造方法。
- 第一の接続部を有し且つ直線状に延びる辺を有する第一の部材と、
第二の接続部を有する第二の部材と、
前記第一の部材と前記第二の部材との間に配置された接着剤層とを備え、
前記第一の接続部と前記第二の接続部が電気的に接続されている半導体装置の製造方法であって、
前記第一の部材、前記接着剤層及び前記第二の部材がこの順序で積層された積層体を準備する積層工程と、
前記積層体に対して厚さ方向に押圧力を加えた状態で、前記積層体に対して熱を加える圧着工程と、
を含み、
前記第一の部材が正方形又は長方形の形状を有する半導体チップであり、
前記圧着工程において、以下の条件1を満たすように、前記積層体に対して熱を加える、半導体装置の製造方法。
<条件1>
前記半導体チップの辺を三等分して計九つのエリアに分割し、当該九つのエリアのうち、前記半導体チップの一つの隅部を含むエリアをエリア1とし、前記エリア1から前記半導体チップの周縁部に沿って並ぶエリアをエリア2~8とすると、
エリア1,3,5,7の各中心部における前記半導体チップの外表面の平均温度Tcと、
エリア2,4,6,8の各中心部における前記半導体チップの外表面の平均温度Tsとの差(Tc-Ts)が15℃以上である。 - 前記圧着工程において、以下の条件2を更に満たすように、前記積層体に対して熱を加える、請求項3に記載の半導体装置の製造方法。
<条件2>
前記九つのエリアのうち、前記半導体チップの中心を含むエリアをエリア9とすると、
エリア2,4,6,8の各中心部における前記半導体チップの外表面の平均温度Tsと、
エリア9の中心部における前記半導体チップの外表面の温度T9との差(Ts-T9)が5℃以上である。 - 前記第二の部材が配線基板、半導体チップ及び半導体ウエハからなる群から選ばれる部材である、請求項1~4のいずれか一項に記載の半導体装置の製造方法。
- 前記接着剤層が、重量平均分子量10000未満の熱硬化性樹脂と、硬化剤とを含有する、請求項1~5のいずれか一項に記載の半導体装置の製造方法。
- 前記接着剤層が、重量平均分子量10000以上の高分子成分を更に含有する、請求項6に記載の半導体装置の製造方法。
- 前記接着剤層がフィルム状接着剤である、請求項1~7のいずれか一項に記載の半導体装置の製造方法。
- 請求項1~8のいずれか一項に記載の半導体装置の製造方法によって製造された半導体装置。
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| PCT/JP2019/033371 Ceased WO2020090205A1 (ja) | 2018-10-30 | 2019-08-26 | 半導体装置及びその製造方法 |
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| WO2022172767A1 (ja) * | 2021-02-12 | 2022-08-18 | 日本発條株式会社 | 回路基板及び製造方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009001564A1 (ja) * | 2007-06-28 | 2008-12-31 | Panasonic Corporation | 半導体素子の実装構造体及びその製造方法、半導体素子の実装方法、並びに加圧ツール |
| JP2011187699A (ja) * | 2010-03-09 | 2011-09-22 | Nec Corp | 半導体装置およびその製造方法 |
| JP2017218532A (ja) * | 2016-06-09 | 2017-12-14 | 日立化成株式会社 | 半導体用接着剤、半導体装置、及び半導体装置の製造方法 |
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|---|---|---|---|---|
| JP2000164633A (ja) * | 1998-11-30 | 2000-06-16 | Matsushita Electric Ind Co Ltd | 半導体実装方法および半導体実装装置 |
| JP2001148403A (ja) * | 1999-11-18 | 2001-05-29 | Seiko Epson Corp | 半導体チップの実装方法および装置 |
| JP5175431B2 (ja) * | 2005-09-16 | 2013-04-03 | 日本電気株式会社 | 半導体装置のリペア方法 |
| JP5217260B2 (ja) | 2007-04-27 | 2013-06-19 | 住友ベークライト株式会社 | 半導体ウエハーの接合方法および半導体装置の製造方法 |
| JP5320844B2 (ja) * | 2008-06-20 | 2013-10-23 | 富士通株式会社 | 先アンダーフィル接合方式半導体装置及びその製造方法 |
| JP6311858B2 (ja) * | 2013-12-12 | 2018-04-18 | 澁谷工業株式会社 | ボンディング装置 |
| KR102246076B1 (ko) * | 2015-11-17 | 2021-05-03 | 한국전자통신연구원 | 반도체 패키지의 제조 방법 |
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2018
- 2018-10-30 WO PCT/JP2018/040306 patent/WO2020090000A1/ja not_active Ceased
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- 2019-08-26 JP JP2020554783A patent/JP7342879B2/ja active Active
- 2019-08-26 KR KR1020217008275A patent/KR102727223B1/ko active Active
- 2019-08-26 WO PCT/JP2019/033371 patent/WO2020090205A1/ja not_active Ceased
- 2019-08-26 CN CN201980058834.9A patent/CN112703583B/zh active Active
- 2019-09-03 TW TW108131588A patent/TWI820200B/zh active
- 2019-09-03 TW TW112137567A patent/TW202403910A/zh unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009001564A1 (ja) * | 2007-06-28 | 2008-12-31 | Panasonic Corporation | 半導体素子の実装構造体及びその製造方法、半導体素子の実装方法、並びに加圧ツール |
| JP2011187699A (ja) * | 2010-03-09 | 2011-09-22 | Nec Corp | 半導体装置およびその製造方法 |
| JP2017218532A (ja) * | 2016-06-09 | 2017-12-14 | 日立化成株式会社 | 半導体用接着剤、半導体装置、及び半導体装置の製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI820200B (zh) | 2023-11-01 |
| KR102727223B1 (ko) | 2024-11-07 |
| KR20210084432A (ko) | 2021-07-07 |
| WO2020090000A1 (ja) | 2020-05-07 |
| TW202403910A (zh) | 2024-01-16 |
| TW202036738A (zh) | 2020-10-01 |
| CN112703583B (zh) | 2025-02-11 |
| CN112703583A (zh) | 2021-04-23 |
| JP7342879B2 (ja) | 2023-09-12 |
| JPWO2020090205A1 (ja) | 2021-10-07 |
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