WO2006103918A1 - フリップチップ実装体とフリップチップ実装方法及びフリップチップ実装装置 - Google Patents
フリップチップ実装体とフリップチップ実装方法及びフリップチップ実装装置 Download PDFInfo
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- WO2006103918A1 WO2006103918A1 PCT/JP2006/305004 JP2006305004W WO2006103918A1 WO 2006103918 A1 WO2006103918 A1 WO 2006103918A1 JP 2006305004 W JP2006305004 W JP 2006305004W WO 2006103918 A1 WO2006103918 A1 WO 2006103918A1
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- circuit board
- semiconductor chip
- porous sheet
- resin
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
Definitions
- the present invention relates to a flip chip mounting method for mounting a semiconductor chip on a circuit board, and in particular, can be applied to a semiconductor chip with a narrow pitch and has high productivity and excellent connection reliability.
- the present invention relates to a flip chip mounting body, a flip chip mounting method, and a flip chip mounting apparatus.
- semiconductor integrated circuit hereinafter referred to as “semiconductor” chips used in electronic devices
- the number of electrode terminals of semiconductor chips and the narrowing of the pitch have rapidly increased. It is.
- flip chip mounting is widely used to reduce wiring delay.
- solder bumps are formed on electrode terminals of a semiconductor chip, and the solder bumps and connection terminals formed on a circuit board are generally joined together. .
- the electrode terminals are changed from the peripheral arrangement to the area arrangement in order to cope with the increase of the electrode terminals.
- the Metsuke method is suitable for narrow pitches, but there are problems with productivity such as complicated processes.
- the screen printing method uses a power mask that is excellent in productivity, and is suitable for narrow pitches.
- solder paste method made of a mixture of solder powder and flux is applied onto a circuit board with electrode terminals formed on the surface, and the circuit board is heated to melt the solder powder and achieve high wettability. Solder bumps are selectively formed on the electrode terminals (see, for example, Patent Document 1).
- a paste-like composition (chemical reaction deposition type solder) consisting mainly of an organic acid lead salt and metallic tin is applied onto a circuit board on which electrode terminals are formed, and the circuit board is heated.
- a substitution reaction of Pb and Sn is caused to selectively deposit an alloy of Pb / Sn on the electrode terminal of the substrate (see, for example, Patent Document 2).
- Patent Document 1 JP 2000-94179 A
- Patent Document 2 Japanese Patent Laid-Open No. 1-157796
- Patent Document 3 Japanese Unexamined Patent Publication No. 2000-332055
- the present invention has been made to solve the above-described problems, and is capable of mounting a next-generation semiconductor chip having a number of electrode terminals exceeding 5000 on a circuit board, with high productivity and reliability.
- Excellent flip chip mounting body, flip chip mounting method and flip chip mounting apparatus Provide a position.
- a flip chip mounting body includes a circuit board having a plurality of connection terminals, a semiconductor chip having a plurality of electrode terminals arranged to face the connection terminals, and the electrode terminals of the semiconductor chip.
- a box-shaped porous sheet which is provided on the opposite side of the formation surface of the semiconductor chip, bent to the formation surface side of the electrode terminal at the outer periphery of the semiconductor chip, and abutted against the circuit board.
- the connection terminal and the electrode terminal of the semiconductor chip are electrically connected by a solder layer, and the circuit board and the semiconductor chip are fixed by a resin.
- a semiconductor chip having a plurality of electrode terminals is arranged facing a circuit board having a plurality of connection terminals, and the connection terminals of the circuit board and the electrodes of the semiconductor chip are arranged.
- a flip chip mounting method for electrically connecting a terminal, wherein the semiconductor chip is bonded to a porous sheet and then the periphery is deformed; solder powder, a convection additive, and a solder mainly composed of a resin A step of applying a resin composition to the circuit board or the semiconductor chip; a step of aligning and arranging the porous sheet on the circuit board; and a temperature at which the solder powder melts the solder resin composition.
- the molten I powder was fluidized with the resin composition, characterized in that it comprises a step of connecting the solder powder self-assembly and the connection terminal by growing and said electrode terminal electrically
- a semiconductor chip having a plurality of electrode terminals is arranged facing a circuit board having a plurality of connection terminals, and the connection terminals of the circuit board and the semiconductors are arranged.
- the method includes a step of electrically connecting the connection terminal and the electrode terminal by self-assembling and growing solder powder.
- a semiconductor chip having a plurality of electrode terminals is arranged opposite to a circuit board having a plurality of connection terminals, and the connection terminals of the circuit board and the semiconductor are arranged.
- a flip-chip mounting method for electrically connecting an electrode terminal of a chip comprising a step of adhering the semiconductor chip to a porous sheet, and a solder resin composition mainly composed of solder powder, a convection additive and a resin. The step of applying to the substrate or the semiconductor chip, the step of aligning and placing the porous sheet on the circuit substrate, the step of deforming the porous sheet, and the solder powder to the resin composition.
- Heating to a melting temperature and generating a gas by boiling or decomposition of the convective additive; and before the gas is convected and scattered through the porous sheet A step of electrically connecting the connection terminal and the electrode terminal by allowing the molten solder powder to flow in the resin composition and self-assembling and growing the solder powder.
- a semiconductor chip having a plurality of electrode terminals is disposed opposite to a circuit board having a plurality of connection terminals, and the connection terminals of the circuit board and the semiconductor are arranged.
- the connecting terminal and the electrode terminal are obtained by allowing the molten solder powder to flow in the resin composition and self-assembling and growing the molten solder powder. And a step of electrically connecting the two.
- the flip chip mounting apparatus of the present invention is a flip chip mounting apparatus for mounting a semiconductor chip on a circuit board by flip chip mounting, a fixing means for fixing the semiconductor chip to a porous sheet, and a periphery of the porous sheet.
- Deformation means for deforming along the outer periphery of the semiconductor chip, application means for applying a solder resin composition mainly composed of solder powder, a convection additive and a resin to the circuit board or the semiconductor chip, and the circuit It includes an alignment means for aligning the semiconductor chip by holding the porous sheet on a substrate, and heating means for melting the solder powder of the resin composition.
- FIGS. 1A to 1C are cross-sectional views showing basic process mechanisms of a flip chip mounting method according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a flip chip mounting body in Embodiment 1 of the present invention.
- 3A to 3E are cross-sectional views showing a flip chip mounting body and a flip chip mounting method according to Embodiment 1 of the present invention.
- FIGS. 4A to 4D are schematic process cross-sectional views for explaining a flip chip mounting body and a flip chip mounting method according to Embodiment 2 of the present invention.
- FIGS. 5A to 5D are schematic process cross-sectional views illustrating a flip chip mounting body and a flip chip mounting method in Embodiment 3 of the present invention.
- 6A to 6D are schematic process cross-sectional views illustrating a flip chip mounting body and a flip chip mounting method in Embodiment 4 of the present invention.
- connection terminal of the circuit board and the electrode terminal of the semiconductor chip are electrically connected by the solder layer.
- This solder layer is formed by assembling solder particles into a solder joint.
- This solder layer heats a solder resin paste containing solder particles, a resin and a convection additive to cause the convection additive to boil to generate convection in the resin, collect the solder particles, and connect terminals and electrodes. It is formed by connecting the terminals. In other words, the convection additive in the paste is boiled by heating, and this boiling is accompanied by the boiling. Solder particles gather.
- solder particles self-assemble into the highly wettable connection terminals and electrode terminals, and can be formed in the solder layer.
- a box-shaped porous sheet that is bent to the electrode terminal formation surface side at the outer periphery of the semiconductor chip and is in contact with the circuit board is provided. This porous sheet allows the gasified convective additive to escape to the outside when the solder particles are gathered between the connection terminals of the circuit board and the electrode terminals of the semiconductor chip to form a solder layer. Used to maintain the gap and position between the connection terminal and the electrode of the semiconductor chip.
- the porous sheet may be a box shape that covers the semiconductor chip and has a ridge with a peripheral edge protruding around the periphery of the opening.
- the porous sheet may have a hole communicating with the front and back.
- the porous sheet may be a gas-permeable material made of thermoplastic resin, thermosetting resin, non-woven fabric, or foam metal.
- the pores of the porous sheet may be closed with resin.
- the portion in contact with the circuit board around the porous sheet may be bonded or sealed with resin.
- a process force that deforms the porous sheet may be a process that involves heating.
- the porous chip is processed into a box shape so as to cover the semiconductor chip, and the peripheral edge side of the opening of the box-shaped porous sheet is in contact with the circuit board, so that the semiconductor The chip and the circuit board may be arranged with a predetermined gap.
- the porous sheet may be processed into a box shape that covers the semiconductor chip and has a ridge with a peripheral edge protruding around the periphery of the opening.
- the gap between the electrode terminal of the semiconductor chip and the connection terminal of the circuit board can be maintained at an optimum distance. Therefore, the wire terminal is disconnected with high resistance by uniform bonding between the electrode terminal and the connection terminal. It is possible to improve the yield that is unlikely to occur.
- the porous sheet may have a hole communicating with the front and back.
- the porous sheet may be a gas-permeable material made of thermoplastic resin, thermosetting resin, non-woven fabric, or foam metal.
- the resin contained in the resin composition penetrates into the porous sheet by heating the circuit board, closes the pores of the porous sheet, and cures after the heating of the circuit board is completed. It may be reduced or prevented.
- the portion in contact with the circuit board around the porous sheet may be bonded or sealed with the resin contained in the resin composition.
- an electrode may be provided so as to surround the connection terminal of the circuit board.
- the electrodes provided so as to surround the connection terminals of the circuit board are formed so as to be positioned inside the porous sheet processed into a box shape, and pseudo bumps are formed by the heating process of the circuit board. May be.
- the electrodes on which the pseudo bumps are formed by the heating process may prevent the passage of the solder powder in the resin composition applied between the semiconductor chips of the circuit board and allow the resin to pass therethrough.
- the scattering of the solder powder in the resin composition applied between the circuit board and the semiconductor chip or the outflow to the outside can be prevented by the electrodes on which the pseudo bumps are formed.
- the reliability and yield can be improved by preventing contact or short-circuiting between the adjacent semiconductor chips due to scattered solder powder.
- the flip chip mounting apparatus of the present invention flips a semiconductor chip onto a circuit board.
- Flip chip mounting apparatus for mounting a semiconductor chip fixing means for fixing the semiconductor chip to the porous sheet, deformation means for deforming the periphery of the porous sheet along the outer periphery of the semiconductor chip, solder powder, convection additive and resin
- the main component means 80 mass% or more, preferably 90 mass% or more.
- the melting point of the solder particles is preferably in the range of 100 ° C or more and 300 ° C or less.
- the average particle size of the solder particles is preferably in the range of 1 to 50 zm.
- the temperature at which the solder resin paste is heated is preferably equal to or higher than the melting point of the solder.
- the solder resin paste is composed of a resin, solder particles, and a convection additive that boils when the resin is heated.
- a thermosetting resin for example, epoxy resin
- Pb-free solder particles are used as solder particles.
- a solvent for example, an organic solvent
- isopropyl alcohol (boiling point 82.4 ° C)
- butyl acetate (boiling point 125 to 126 ° C)
- butyl carbitol Etthylene glycol monobutyl ether, boiling point 201.9 ° C
- ethylene glycol (boiling point 197.6 ° C)
- the content of the convection additive in the resin is not particularly limited, but it is preferably contained in the resin at a ratio of 0.:! To 20% by weight.
- convection of a convective additive means convection as a form of motion, and the kinetic energy boiling into the solder particles dispersed in the resin is caused by the motion of the convective additive boiling in the resin.
- the movement may be any form as long as the movement gives the action of promoting the movement of the solder particles.
- a convective additive that generates a gas a gas such as H, C, N, etc.
- heating the resin can be used in addition to the one that boils itself and generates convection. Examples of this include compounds containing water of crystallization, The compound which decomposes
- Solder particles can be selected and used. For example, the power shown in Table 1 can be listed. The materials shown in Table 1 as an example can be used alone or in appropriate combination. If a material having a melting point of solder particles lower than the curing temperature of the thermosetting resin is used, the resin flows and self-assembles, and then the resin is further heated to be cured, and electrical connection and sealing with the resin are performed. It is preferable at the point which can be performed.
- the preferred melting point of the solder particles is 100 to 300 ° C, more preferably 139 to 240 ° C as shown in Table 1. If the melting point is less than 100 ° C, there is a tendency for problems in durability. When the melting point exceeds 300 ° C, the selection of the resin becomes difficult.
- the preferred average particle size of the solder particles is in the range of 1 to 30 / im, and more preferably in the range of 5 to 20 / im.
- the average particle size can be measured with a commercially available particle size distribution meter. For example, it can be measured using a Horiba laser diffraction particle size measuring device (LA920), a Shimadzu laser diffraction particle size measuring device (SALD2100), or the like.
- resins include epoxy resins, phenol resins, silicone resins, diallyl phthalate resins, furan resins, melamine resins, and other thermosetting resins, polyester elastomers, fluororesins, polyimide resins, polyamide resins.
- Thermoplastic resin such as amide resin, or light (ultraviolet) curable resin, or a combination of them Combined materials can be used.
- the solder particles and the resin are preferably used after being uniformly mixed.
- the solder particles are 20% by volume and the epoxy resin is 80% by volume.
- the solder particles may be in a paste form while maintaining a dispersed state, or a resin formed in a sheet form may be used.
- solder particles for example, lead-free solder alloy particles having a melting point of 200 to 250 ° C can be used.
- the resin is a thermosetting resin, it is preferable that the curing temperature of the resin is higher than the melting point of the solder. In this way, the resin can be cured during the process of forming the electrical connection body or forming the metal bump, and the work process can be shortened.
- the flip chip mounting body and the mounting method thereof of the present invention a mounting method in which the semiconductor chip and the circuit board are securely connected to each other can be achieved, and the circuit board has a long lifetime due to improved weather resistance against humidity and the like Flip-chip mounting body with high performance and reliability can be realized. Furthermore, since the bonding state between the electrode terminals and the connection terminals can be made uniform, the yield is high and the production efficiency is also improved.
- FIGS. 1A to 1C are diagrams showing an example basic process mechanism of the present invention.
- a resin composition 15 containing solder powder 12, a convection additive 13 and a resin 14 is supplied onto a circuit board 10 on which a plurality of connection terminals 11 are formed.
- the circuit board 10 and the semiconductor chip 20 are brought into contact with each other with the resin composition 15 supplied between the circuit board 10 and the semiconductor chip 20 interposed therebetween.
- the semiconductor chip 20 having the plurality of electrode terminals 21 is arranged to face the circuit board 10 having the plurality of connection terminals 11.
- the circuit board 10 is heated to melt the resin composition 15.
- the heating temperature of the circuit board 10 is higher than the melting point of the solder powder 12.
- the melted solder powder 12 is bonded to each other in the melted resin composition 15 and self-assembled between the connection terminal 11 and the electrode terminal 21 having high wettability as shown in FIG. Form.
- the semiconductor chip 20 is fixed to the circuit board 10 by curing the resin 14.
- the resin composition 15 containing the solder powder 12 further contains a convection additive 13 that boils at a temperature at which the solder powder 12 melts. That is, the convective additive 13 contained in the resin composition 15 boils at the temperature at which the solder powder 12 is melted. Then, the boiling convection additive 13 convects the resin composition 14, thereby promoting the movement of the molten solder powder 12 floating in the resin composition 14.
- the uniformly grown molten solder powder self-assembles between the connection terminals 11 of the circuit board 10 with high wettability and the electrode terminals 21 of the semiconductor chip 20, thereby connecting the connection terminals 11 and the electrode terminals. An electrical connection is made between this and 21 via a uniform and fine solder joined body 22.
- the above method is intended to add a means for forcibly moving the molten solder powder by further including a convection additive in the resin composition containing the solder powder.
- a convection additive in the resin composition containing the solder powder.
- the present invention realizes a novel flip chip mounting method that is more reliable and highly reliable.
- it is possible to produce a flip-chip mounted circuit board with a very high yield.
- FIG. 2 is a cross-sectional view of the flip chip mounting body according to the first embodiment of the present invention.
- a flip chip mounting body 200 in Embodiment 1 of the present invention includes a semiconductor chip 206 having a plurality of electrode terminals 207 arranged to face a plurality of connection terminals 211 formed on a circuit board 213.
- the porous sheet 205 force provided on the opposite side of the formation surface of the electrode terminal 207 of the semiconductor chip 206 is bent into a box shape 209 on the formation surface side of the electrode terminal 207 at the outer periphery of the semiconductor chip 206, and the semiconductor chip
- the end surface of the box shape 209 is in contact with the circuit board 213.
- FIG. 3A_E is a schematic process cross-sectional view illustrating the flip chip mounting body and the flip chip mounting method according to the first embodiment of the present invention.
- the upper mold 201 has an intake passage composed of an exhaust pipe 204 and a small hole.
- the porous sheet 205 is made of, for example, a thermosetting resin or a thermoplastic resin that does not dissolve in a solvent, and has a hole that allows gas to pass through on the front and back sides.
- a material having a microporous material such as PET (polyethylene terephthalate) or PTFE (polytetrafluoroethylene) can be used.
- the material of the porous sheet 205 may be any material other than resin, such as non-woven fabric and foam metal.
- a semiconductor chip 206 having a plurality of electrode terminals 2007 on the lower surface of the semiconductor chip 206 is bonded to the porous sheet 205.
- the porous sheet 20 5 to which the semiconductor chip 206 is attached is placed between the upper mold 201 and the lower mold 208 and pressed to thereby form the porous sheet 20.
- the porous sheet 20 5 to which the semiconductor chip 206 is attached is placed between the upper mold 201 and the lower mold 208 and pressed to thereby form the porous sheet 20.
- the end portion of 5 is bent along the periphery (outer periphery) of the semiconductor chip 206 to be deformed into a box shape 209.
- the upper mold 201 and the lower mold 208 are heated to an appropriate temperature for deformation (for example, 120 ° C in the case of PET), the shape of the porous sheet 205 can be further easily deformed. Masle.
- the lower mold 208 is extracted, and the porous sheet 205 and the semiconductor chip 206 are sucked and moved to the position of the circuit board 213 on which the upper mold 201 is mounted.
- the connection terminal 211 formed on the surface of the circuit board 213 and the electrode terminal 207 of the semiconductor chip 206 are aligned by image recognition using a camera or the like.
- solder powder, convection additive and And a resin composition 212 containing a resin is applied by an application means such as a dispenser.
- an electrode 210 for forming a pseudo bump for preventing, for example, scattering of solder powder is provided around the connection terminal 211 of the circuit board 213 so as not to be short-circuited.
- the electrode 210 for forming the pseudo bump is provided on the circuit board 213 within the range surrounded by the box shape 209 of the porous sheet 205.
- the semiconductor chip 206 and the circuit board 213 are brought into contact with each other with the resin composition 212 interposed therebetween.
- the electrode terminal 207 of the semiconductor chip 206 and the connection terminal 211 of the circuit board 213 are opposed to each other by a box shape 209 of the porous sheet 205 at a predetermined interval.
- the predetermined interval is such that at least the electrode terminal of the semiconductor chip and the connection terminal of the circuit board do not contact each other, and the molten solder powder can enter.
- heating is performed by a heating means such as a heater to a temperature at which the solder powder is melted at about 220 ° C to 250 ° C.
- solder powder (not shown) is boiled or evaporated to gasify, and solder powder (not shown) becomes melted powder. Then, the molten solder powder in the resin composition 212 is moved by convection in the process of passing through the pores of the porous sheet 205 bent into the box shape 209 and exiting from the exhaust pipe 204. .
- the moved molten solder powder self-assembles between the electrode terminals 207 of the semiconductor chip 206 and the connection terminals 211 of the circuit board 213, which are arranged facing each other and have good wettability, and grows. .
- the solder resin paste contains 85 parts by volume of bisphenol F-type epoxy resin (Epicoat 806 manufactured by Japan Epoxy Resin Co., Ltd., containing a curing agent) and a particle size of 10 to 25 ⁇ m. 15 parts by volume of SnAgCu powder (average particle size 17 ⁇ m) and 3 parts by weight of isopropyl alcohol as a convective additive were uniformly mixed.
- This solder resin paste was injected between the circuit board 213 and the semiconductor chip surface 206 using a dispenser, heated from room temperature (25 ° C.) to 250 ° C. and held for 30 seconds. After cooling and observing the cross section, the state of Fig. 3E was confirmed.
- a porous PTFE membrane with a thickness of about 30 ⁇ m was used as the porous sheet. That is, as shown in FIG. 3E, a solder layer 215 that electrically connects the electrode terminal 207 and the connection terminal 211 is formed, and the flip die mounting body 250 is manufactured by removing the upper mold 201. Also, the molten solder powder grows by self-assembly on the pseudo bump forming electrode 210 to form the pseudo bump 214. By forming the pseudo bump 214, the molten solder powder that has not been used for forming the solder layer 215 is captured on the electrode 210 for forming the pseudo bump, and is prevented from flowing out to the outside.
- the electrode 210 for forming pseudo bumps has a configuration in which the electrode 210 which is not necessarily provided is not provided when the solder powder does not scatter or when the problem does not occur even if the scatter is shown in FIG. Chip mounting body 200 is obtained.
- the resin 217 in the resin composition 212 can protrude slightly outside in the process of forming the pseudo bump 214. Therefore, after the gasified convective additive has almost escaped from the exhaust pipe 204, the resin whose viscosity has been temporarily reduced by heating penetrates into the pores of the porous sheet 205 by capillarity and supports the pores. . As a result, the resin 217 that has penetrated into the pores in the porous sheet 205 closes the pores in the porous sheet 205 after curing, and prevents intrusion of humidity and the like from the outside.
- the cured resin 217 fixes the semiconductor chip 206 and the circuit board 213, and at the peripheral edge of the porous sheet 205 bent into the box shape 209 by the resin 217 protruding from the pseudo bump 214.
- the part and the circuit board 213 are bonded and fixed.
- connection between the connection terminal of the circuit board and the electrode terminal of the semiconductor chip can be reliably performed by the self-assembled solder layer.
- the distance between the circuit board and the semiconductor chip can be kept constant and uniform by the porous sheet deformed into a box shape.
- the porous sheet has a structure in which moisture and the like do not easily pass through in the end, the weather resistance of the semiconductor chip is improved, and the reliability can be improved and the long-term use can be achieved. Play.
- 4A to 4D are schematic process diagrams illustrating the flip chip mounting body and the flip chip mounting method according to the second embodiment of the present invention.
- 4A to 4D the same components as those in FIG. 3E are denoted by the same reference numerals, and description thereof is omitted.
- flip-chip mounting body 300 in the second embodiment of the present invention differs from flip-chip mounting body 250 in the first embodiment in its mounting method, and the other configurations are the same. It is.
- connection terminal 211 on the circuit board 213 and the electrode terminal 207 of the semiconductor chip 206 are arranged in advance to face each other. Then, between the semiconductor chip 206 and the circuit board 213, a paste-like solder powder, a convection additive, and a resin composition 212 mainly composed of a resin are applied and sandwiched by, for example, a dispenser. Yes. Further, a porous sheet 205 is bonded to the semiconductor chip 206 in alignment with the semiconductor chip 206.
- the mold 220 is lowered from the top so as to draw the semiconductor chip 206.
- the mold 220 is preferably heated to facilitate the deformation of the porous sheet 205.
- a porous sheet 205 is attached to a semiconductor chip by a mold 220.
- the semiconductor chip 206 is deformed into a box shape 209 along the outer periphery of 206. Note that it is preferable that the semiconductor chip 206 be deformed at a peripheral position slightly larger than the outer periphery of the semiconductor chip 206 so that the semiconductor chip 206 is not damaged.
- the porous sheet 205 and the semiconductor chip 206 are drawn into the mold 220 by the suction action by the intake pipe 220 through the intake passage 203. Thereby, the porous sheet 205 is deformed into the shape of the mold 220.
- the mold 220 is brought into contact with the surface of the circuit board 213, so that the distance between the semiconductor chip 206 and the circuit board 213 is kept constant. Note that this distance is such that at least the electrode terminals of the semiconductor chip and the connection terminals of the circuit board do not contact each other, and the molten solder powder can enter.
- Heating means such as a heater (not shown) is heated to a temperature at which, for example, the solder powder is melted and the convective additive is boiled or evaporated to form gas 216, for example, 220 ° C to 250 ° C.
- the molten solder powder in the resin composition 212 is moved by convection.
- the moved molten solder powder self-assembles between the electrode terminals 207 of the semiconductor chip 206 and the connection terminals 211 of the circuit board 213, which are arranged facing each other and have good wettability, and grows. .
- the solder layer 215 that electrically connects the electrode terminal 207 and the connection terminal 211 is formed, and the flip chip mounting body 300 is manufactured by removing the mold 220.
- . 217 is a resin.
- the molten solder powder self-assembles and grows on the pseudo bump forming electrode 210 to form the pseudo bump 214.
- the molten solder powder not used for forming the solder layer 215 becomes the electrode 21 for forming the pseudo bump.
- the electrode 210 for forming the pseudo bump does not necessarily have to be provided if the solder powder does not scatter or does not cause a problem even if it scatters.
- porous sheet is a thermoplastic resin, a thermosetting resin, or a non-woven fabric
- flip chip mounting can be performed at a very low cost and with high productivity.
- 5A_D are schematic process diagrams illustrating the flip chip mounting body and the flip chip mounting method according to Embodiment 3 of the present invention.
- 5A to 5D the same components as those in FIGS. 3A to 3E are denoted by the same reference numerals, and the description thereof is omitted.
- flip-chip mounting body 400 in Embodiment 3 of the present invention is different from flip-chip mounting body 250 in Embodiment 1 in that it has a flange 401 on porous sheet 205 and its mounting method. The other configurations are the same.
- the porous sheet 205 is deformed in advance into a box shape having a flange 401 by the upper mold 201 and the lower mold 208.
- the force described in the example in which the box-shaped end of the porous sheet 205 is bent to provide the flange 401 is not limited to this.
- the semiconductor chip is not bonded to the porous sheet 205 in the deformation of the box shape, conditions such as pressurization and heating that do not require consideration of the reliability of the semiconductor chip are not limited. Therefore, in particular, the third embodiment of the present invention is effective when the porous sheet 205 is a material that is not easily deformed by heat, such as foam metal.
- a magnetic material such as nickel metal or iron as the foam metal, it is possible to obtain a shielding effect that prevents the generation of noise from the mounted semiconductor chip or prevents external noise.
- the upper mold 201 is previously connected to the electrode terminals 207 of the semiconductor chip 206 and the circuit board 213. It is moved to a position where it is placed opposite to 211. At that time, between the semiconductor chip 206 and the circuit board 213, a slurry-like solder powder, a convection additive, and a resin composition 212 mainly composed of a resin are applied and sandwiched by, for example, a dispenser. Yes.
- the slurry-like resin composition 212 is supplied in a slightly excessive amount so as to spread slightly outward when the box-shaped porous sheet 205 having the flange 401 is pressed through the semiconductor chip 206. It is preferable. As a result, as shown in FIG. 5C, the slurry-like resin composition 212 fills the inside of the box-shaped porous sheet 205 having the ridges 401 when the porous sheet 205 is pressed through the semiconductor chip 206. At this time, the semiconductor chip 206 is attracted to the porous sheet 205 through the pores of the porous sheet 205.
- the semiconductor chip 206 and the circuit board 213 face each other at a predetermined interval by the box shape 209 of the porous sheet 205 having the flange 401.
- the predetermined interval is at least so that the electrode terminals of the semiconductor chip and the connection terminals of the circuit board do not contact each other.
- the molten solder powder can penetrate.
- the solder powder is melted by the heating means such as the heater 402 from the lower side of the upper mold 201 or the circuit board 213, and the convective additive is boiled or Heat to a temperature at which it evaporates to gas 216, for example 220 ° C to 250 ° C.
- solder powder (not shown) boils or evaporates to form gas 216, and solder powder (not shown) becomes molten solder powder. Then, the gas 216 passes through the pores of the porous sheet 205 bent into a box shape having the flange 401 and exits from the exhaust pipe 204, and in the process of melting, the molten solder in the resin composition 212 is discharged. The powder is moved by convection.
- the moved molten solder powder self-assembles between the electrode terminals 207 of the semiconductor chip 206 and the connection terminals 211 of the circuit board 213, which are arranged facing each other and have good wettability, and grows. .
- the solder layer 215 that electrically connects the electrode terminal 207 and the connection terminal 211 is formed, and the flip chip mounting body 400 that is flip chip mounted by removing the upper mold 201 is formed.
- Produced. 217 is a resin.
- the molten solder powder is captured by the flange 401 of the box-shaped porous sheet 205 and cannot be scattered outside.
- the resin whose viscosity has been temporarily reduced by heating penetrates into the pores of the porous sheet 205 by capillary action and becomes empty. Fill the hole.
- the resin that has permeated into the pores in the porous sheet 205 closes the pores in the porous sheet 205 after curing, and prevents intrusion of humidity and the like from the outside.
- the resin in the cured resin composition fixes the semiconductor chip 206 and the circuit board 213, and part of the resin enters the portion 401 of the box-shaped porous sheet 205.
- the porous sheet 205 and the circuit board 213 are bonded and fixed. That is, after the resin is cooled and completely cured, the semiconductor chip 206, the circuit board 213, and the box-shaped porous sheet 205 are completely fixed to each other by the action of the resin.
- FIG. 5 a box-shaped porous sheet having substantially the same shape as the outer periphery of the semiconductor chip has been described, but the present invention is not limited to this.
- the semiconductor chip Larger than the outer shape, even a box-shaped porous sheet.
- the solder powder is formed by the wrinkles formed around the box-shaped porous sheet. And flow of resin can be prevented. Further, since the bonding area between the circuit board and the circuit board can be increased by the wrinkles as compared with the case without wrinkles, the bonding between the circuit board and the porous sheet is strengthened, and the reliability against deformation and the like is further increased.
- 6A_D are schematic process diagrams illustrating the flip chip mounting body and the flip chip mounting method according to Embodiment 4 of the present invention.
- 6A to 6D the same components as those in FIGS. 3A to 3E are denoted by the same reference numerals, and description thereof is omitted.
- flip chip mounting body 500 in the fourth embodiment of the present invention is different from flip chip mounting body 400 in the third embodiment in the mounting method, and the other configurations are the same. It is.
- the step of deforming porous sheet 205 is omitted because it is the same as FIG. 5A showing the step of the third embodiment.
- the semiconductor chip 206 is vacuum-adsorbed on the inner surface of the porous sheet 205 through the pores of the porous sheet 205 in advance.
- a resin composition 212 containing paste-like solder powder, a convective additive and a resin as main components is applied to the lower surface of the semiconductor chip 206 by a coating means using, for example, a dispenser. Is done.
- the application of the resin composition 212 may be performed on the circuit board 213.
- the upper mold 201 is lowered while aligning the connection terminal 211 of the circuit board 213 and the electrode terminal 207 of the semiconductor chip 206.
- the semiconductor chip 206, the circuit board 213, and the force S are arranged in the porous sheet 205.
- the electrode terminal 207 of the semiconductor chip 206 and the connection terminal 211 of the circuit board 213 are aligned so as to face each other at a predetermined interval.
- the predetermined interval is at least that the electrode terminal of the semiconductor chip and the connection terminal of the circuit board do not contact each other The molten solder powder can penetrate.
- the solder powder is melted and the convective additive is boiled or evaporated from the lower side of the upper mold 201 or the circuit board 213 by heating means such as the heater 402, for example.
- the gas is heated to a temperature of 216, for example, 220 ° C to 250 ° C.
- solder powder (not shown) boils or evaporates to form gas 216, and solder powder (not shown) becomes molten solder powder. Then, the gas 216 passes through the pores of the porous sheet 205 bent into a box shape having the flange 401 and exits from the exhaust pipe 204, and in the process of melting, the molten solder in the resin composition 212 is discharged. The powder is moved by convection.
- the moved molten solder powder self-assembles between the electrode terminals 207 of the semiconductor chip 206 and the connection terminals 211 of the circuit board 213, which are arranged facing each other and have good wettability, and grows. .
- a solder layer 215 that electrically connects the electrode terminal 207 and the connection terminal 211 is formed, and a flip chip mounting body 500 that is flip chip mounted by removing the upper mold 201 is produced.
- Is done. 217 is a resin.
- the same effects as those of the respective embodiments can be obtained, and the porous sheet 205 and the semiconductor chip 206 can be compared with the third embodiment. Since it is transported as a single unit, stable transport with less air leakage during vacuum suction can be realized.
- the present invention has been described above with reference to the embodiments, the description can be variously modified without being limited.
- a resin containing solder powder and a convection additive the force described with a thermosetting resin as an example. If the porous sheet is transparent to light, for example, the fluidity is higher than the melting temperature of the solder powder. You may use the photocurable resin which has these, and these combination type resin.
- the box shape of the porous sheet has been described as being bent at a right angle.
- the present invention is not limited to this.
- a taper shape may be sufficient. This As a result, the gas force generated by boiling of the convection additive, etc. can be expanded, and the area of the porous sheet that escapes due to the pores of the porous sheet can be enlarged, so that the curing temperature and time can be easily adjusted.
- the resin in the resin composition includes epoxy resin, unsaturated polyester resin, polybutadiene resin, polyimide resin, polyamide resin, and cyanate resin. It is also possible to use a resin as a main material.
- flux as a convective additive
- Medium boiling solvents or high boiling solvents such as isobutyl alcohol, xylene, isopentyl alcohol, butyl acetate, tetrachloroethylene, methyl isobutyl ketone, ethinorecanole bitonole, butyl carbitol, ethylene glycol, etc. it can.
- the present invention can be applied to flip chip mounting of next-generation semiconductor chips that have a narrow pitch, and is useful in fields where flip chip mounting with excellent productivity and reliability is required.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007510367A JP4397947B2 (ja) | 2005-03-28 | 2006-03-14 | フリップチップ実装体とフリップチップ実装方法及びフリップチップ実装装置 |
US11/909,856 US7732920B2 (en) | 2005-03-28 | 2006-03-14 | Flip chip mounting body, flip chip mounting method and flip chip mounting apparatus |
US12/764,455 US8071425B2 (en) | 2005-03-28 | 2010-04-21 | Flip chip mounting body, flip chip mounting method and flip chip mounting apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005090888 | 2005-03-28 | ||
JP2005-090888 | 2005-03-28 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/909,856 A-371-Of-International US7732920B2 (en) | 2005-03-28 | 2006-03-14 | Flip chip mounting body, flip chip mounting method and flip chip mounting apparatus |
US12/764,455 Division US8071425B2 (en) | 2005-03-28 | 2010-04-21 | Flip chip mounting body, flip chip mounting method and flip chip mounting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006103918A1 true WO2006103918A1 (ja) | 2006-10-05 |
Family
ID=37053181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/305004 WO2006103918A1 (ja) | 2005-03-28 | 2006-03-14 | フリップチップ実装体とフリップチップ実装方法及びフリップチップ実装装置 |
Country Status (4)
Country | Link |
---|---|
US (2) | US7732920B2 (ja) |
JP (1) | JP4397947B2 (ja) |
CN (1) | CN100536102C (ja) |
WO (1) | WO2006103918A1 (ja) |
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JP4402718B2 (ja) * | 2005-05-17 | 2010-01-20 | パナソニック株式会社 | フリップチップ実装方法 |
US7537961B2 (en) * | 2006-03-17 | 2009-05-26 | Panasonic Corporation | Conductive resin composition, connection method between electrodes using the same, and electric connection method between electronic component and circuit substrate using the same |
WO2007122868A1 (ja) * | 2006-03-28 | 2007-11-01 | Matsushita Electric Industrial Co., Ltd. | バンプ形成方法およびバンプ形成装置 |
JP5208205B2 (ja) * | 2008-04-18 | 2013-06-12 | パナソニック株式会社 | フリップチップ実装方法とフリップチップ実装装置およびそれに使用されるツール保護シート |
JP5264585B2 (ja) * | 2009-03-24 | 2013-08-14 | パナソニック株式会社 | 電子部品接合方法および電子部品 |
EP2519088A1 (en) * | 2009-12-24 | 2012-10-31 | Sumitomo Bakelite Co., Ltd. | Conductive connection material, electronic component producing method, and electronic member and electronic component with conductive connection material |
JP5664558B2 (ja) | 2010-01-29 | 2015-02-04 | 住友ベークライト株式会社 | 導電接続シート、端子間の接続方法、接続端子の形成方法、半導体装置および電子機器 |
JP5625498B2 (ja) * | 2010-05-28 | 2014-11-19 | 株式会社村田製作所 | 超音波センサ |
US8381965B2 (en) | 2010-07-22 | 2013-02-26 | Taiwan Semiconductor Manufacturing Company, Ltd. | Thermal compress bonding |
US8651359B2 (en) * | 2010-08-23 | 2014-02-18 | International Business Machines Corporation | Flip chip bonder head for forming a uniform fillet |
US8104666B1 (en) * | 2010-09-01 | 2012-01-31 | Taiwan Semiconductor Manufacturing Company, Ltd. | Thermal compressive bonding with separate die-attach and reflow processes |
US8177862B2 (en) | 2010-10-08 | 2012-05-15 | Taiwan Semiconductor Manufacturing Co., Ltd | Thermal compressive bond head |
US9230896B2 (en) * | 2012-06-05 | 2016-01-05 | Stats Chippac, Ltd. | Semiconductor device and method of reflow soldering for conductive column structure in flip chip package |
JP2014065766A (ja) * | 2012-09-24 | 2014-04-17 | Dexerials Corp | 異方性導電接着剤 |
US9245770B2 (en) * | 2012-12-20 | 2016-01-26 | Stats Chippac, Ltd. | Semiconductor device and method of simultaneous molding and thermalcompression bonding |
US9653411B1 (en) * | 2015-12-18 | 2017-05-16 | Intel Corporation | Electronic package that includes fine powder coating |
JP7108492B2 (ja) * | 2018-08-06 | 2022-07-28 | 株式会社ディスコ | 保護部材形成装置 |
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Also Published As
Publication number | Publication date |
---|---|
US7732920B2 (en) | 2010-06-08 |
US20090008800A1 (en) | 2009-01-08 |
JPWO2006103918A1 (ja) | 2008-09-04 |
JP4397947B2 (ja) | 2010-01-13 |
CN100536102C (zh) | 2009-09-02 |
US8071425B2 (en) | 2011-12-06 |
US20100203675A1 (en) | 2010-08-12 |
CN101151723A (zh) | 2008-03-26 |
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