WO2007108290A1 - バンプ形成方法およびバンプ形成装置 - Google Patents
バンプ形成方法およびバンプ形成装置 Download PDFInfo
- Publication number
- WO2007108290A1 WO2007108290A1 PCT/JP2007/053866 JP2007053866W WO2007108290A1 WO 2007108290 A1 WO2007108290 A1 WO 2007108290A1 JP 2007053866 W JP2007053866 W JP 2007053866W WO 2007108290 A1 WO2007108290 A1 WO 2007108290A1
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- fluid
- electrode
- substrate
- wiring board
- bump
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- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/532—Conductor
- Y10T29/53204—Electrode
Definitions
- the present invention relates to a method for forming a bump on an electrode of a wiring board.
- the present invention also relates to a bump forming apparatus.
- solder bumps are generally formed on the electrode terminals of the LSI chip, and are generally joined to the electrodes formed on the wiring board via the solder bumps.
- solder paste method for example, Patent Document 1.
- solder paste made of a mixture of solder powder and flux is applied onto a substrate with electrodes on the surface, and the substrate is heated to melt the solder powder and achieve high wettability! / Solder bumps are selectively formed on the electrodes.
- Patent Document 2 a technique called a super solder method (for example, Patent Document 2) uses a paste-like composition (chemical reaction precipitation type solder) mainly composed of an organic acid lead salt and metallic tin as an electrode. By applying a solid coating on the resulting substrate and heating the substrate, a substitution reaction of Pb and Sn occurs. Thus, an alloy of PbZSn is selectively deposited on the electrode of the substrate.
- a paste-like composition chemical reaction precipitation type solder
- a technique called a super just method involves immersing a substrate having an electrode formed on the surface thereof in a drug to form an adhesive film only on the surface of the electrode, and then Solder powder is brought into contact with the adhesive film to adhere the solder powder onto the electrode, and then the substrate is heated to selectively form molten solder on the electrode.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-94179
- Patent Document 2 Japanese Patent Laid-Open No. 1-157796
- Patent Document 3 Japanese Patent Laid-Open No. 7-74459
- solder paste method described above was originally developed as a technique for selectively pre-coating solder on the electrodes formed on the substrate. In order to apply to the bump formation necessary for flip chip mounting, There are the following problems.
- the chemical reaction deposition solder material used in the Super Solder method uses a specific chemical reaction, so the degree of freedom in selecting the solder composition is low. Has also left challenges.
- solder powder is uniformly deposited on the electrode, uniform solder bumps can be obtained and the degree of freedom in selecting the solder composition is great.
- the bump formation technique has a problem with a newly developed technique that is not limited to a popular technique such as a plating method or a screen printing method.
- the inventor of the present application thought that developing a new bump formation method without being bound by the existing bump formation technology would ultimately lead to a high-potential technology, and repeated research and development.
- the present invention has been made in view of the problems, and its main object is to provide a bump forming method and a bump forming apparatus excellent in productivity.
- the bump forming method of the present invention is a method of forming a bump on an electrode of a wiring board, wherein conductive particles and a bubble generating agent are present on the first region including the electrode of the wiring board.
- step (c) the fluid self-assembles on the electrode by bubbles generated from the bubble generating agent
- step (d) the conductive particles contained in the fluid self-assembled on the electrode It is characterized by forming bumps on the electrodes by melting.
- Another bump forming method of the present invention is a method of forming a bump on an electrode of a wiring board, wherein conductive particles and bubbles are formed on a first region including the electrode in a part of the wiring board.
- step (c) the fluid self-assembles on the electrode in the step (c), and in step (d), the fluid contained in the fluid self-assembled on the electrode.
- Bumps are formed on the electrodes by melting the particles.
- the bump forming apparatus of the present invention has a bump formed on the electrode of the wiring board by the bump forming method.
- An apparatus for forming a wiring board comprising: a stage on which a wiring board is placed; a header for holding a board having a projection surface or a recess on the main surface; and a heating mechanism for heating the stage or the holding part.
- the fluid containing the conductive particles and the bubble generating agent is supplied onto the first region including the electrode of the wiring board placed on the stage, and the substrate held by the header is the protruding surface of the wiring board.
- Another bump forming apparatus of the present invention is a bump forming apparatus for forming a bump on an electrode of a wiring board, and a stage on which the wiring board is placed, and a plate-like member disposed to face the stage
- the header has a mechanism that can move up and down relative to the stage, and the conductive particles are placed on the wiring board mounted on the stage.
- a fluid containing the bubble generating agent is provided, and the plate-like member held by the header is arranged in contact with the fluid supplied on the wiring board, and the force [1 fluid mechanism is provided by the heat mechanism.
- the fluid is self-assembled on the electrode by the bubbles generated from the bubble generating agent contained in the fluid when heated, and the fluid is further heated by the heating mechanism to self-assemble on the electrode.
- the conductive particles contained inside melt Thus, a bump is formed on the electrode.
- the fluid containing the conductive particles and the bubble generating agent is supplied onto the first region including the electrode in the wiring board, and then the projecting surface is formed.
- the substrate is placed so that the protruding surface faces the first region of the wiring substrate, and then the fluid is heated to generate bubbles from the bubble generating agent.
- the conductive particles can be self-assembled on the electrode by heating the fluid and generating bubbles from the bubble generating agent. As a result, a bump forming method with excellent productivity can be provided.
- FIGS. 1 (a) to 1 (d) are process cross-sectional views showing the basic process of a bump forming method using resin self-assembly.
- FIGS. 2 (a) to 2 (d) are process cross-sectional views showing the basic process of a bump forming method using self-assembly of resin.
- FIGS. 3 (a) and 3 (b) are diagrams illustrating the mechanism of resin self-assembly.
- FIG. 4 is a view for explaining a resin moving mechanism in pump formation.
- FIG. 5 is a photomicrograph for explaining a wiring pattern of an example in which bump formation is performed in a partial region.
- FIG. 6 is a photomicrograph for explaining a wiring pattern of an example in which bump formation is performed in a partial region.
- FIG. 7 is a photomicrograph for explaining an example in which movement of a resin is observed.
- Garden 8 is a photomicrograph for explaining an example in which the movement of the resin is observed.
- FIG. 9 is a photomicrograph for explaining an example in which the movement of the resin is observed.
- FIG. 10 is a view for explaining a resin moving mechanism in bump formation.
- 11 (a) to 11 (c) are process cross-sectional views illustrating a bump forming method according to an embodiment of the present invention.
- FIGS. 12 (a) to 12 (d) are process cross-sectional views illustrating a bump forming method according to an embodiment of the present invention.
- FIGS. 13A and 13B are a process top view and a process cross-sectional view showing a bump forming method according to an embodiment of the present invention, respectively.
- FIG. 14 is a plan view showing a peripheral arrangement of electrodes.
- FIG. 15 is a plan view showing the arrangement of an area array of electrodes.
- FIG. 16 is a photomicrograph showing the experimental results of bump formation.
- FIG. 17 is a photomicrograph showing the experimental results of bump formation.
- FIG. 18 is a photomicrograph showing the experimental results of bump formation.
- FIG. 19 is a photomicrograph showing the experimental results of bump formation.
- FIG. 20 is an SEM photograph showing the experimental results of bump formation.
- FIG. 21 is a photomicrograph showing the experimental results of bump formation.
- FIG. 22 is a photomicrograph showing the experimental results of bump formation.
- FIG. 23 is a diagram showing a configuration of a modified example of the embodiment of the present invention.
- FIGS. 24 (a) to 24 (c) are process cross-sectional views showing modifications of the embodiment of the present invention.
- FIG. 25 is a diagram showing a material for conductive particles according to an embodiment of the present invention.
- FIG. 26 is a diagram showing a material for the bubble generating agent according to the embodiment of the present invention.
- FIG. 27 is a diagram showing materials for the bubble generating powder according to the embodiment of the present invention.
- FIG. 28 is ne sectional HI of the bump forming apparatus according to an embodiment of the present invention is shown schematically.
- 29 (a) to 29 (c) are process cross-sectional views for explaining the operation of the bump forming apparatus according to the embodiment of the present invention.
- FIGS. 30 (a) and 30 (b) are process cross-sectional views for explaining the operation of the bump forming apparatus according to the embodiment of the present invention.
- 31 (a) and 31 (b) are process cross-sectional views for explaining the operation of the bump forming apparatus according to the embodiment of the present invention.
- 32 (a) and 32 (b) are process cross-sectional views for explaining the operation of the bump forming apparatus according to the embodiment of the present invention.
- 33 (a) and 33 (b) are process cross-sectional views for explaining the operation of the bump forming apparatus according to the embodiment of the present invention.
- FIGS. 34 (a) and 34 (b) are diagrams for explaining a paste supply method using a needle member.
- FIG. 35 is a cross-sectional view for explaining a paste supply method.
- FIG. 36 is a cross-sectional view for explaining a paste supply method.
- FIG. 37 is a top view schematically showing a modified example of the bump forming apparatus according to the embodiment of the present invention.
- FIG. 38 (a) is a cross-sectional view showing a configuration in which the wiring board is arranged on the lower side
- FIG. 38 (b) is a cross-sectional view showing a configuration in which the wiring board is arranged on the upper side.
- the applicant of the present application is a method of forming bumps by self-assembling conductive particles (for example, solder powder) on an electrode such as a wiring board or a semiconductor chip, or a wiring board and a semiconductor chip.
- conductive particles for example, solder powder
- an electrode such as a wiring board or a semiconductor chip, or a wiring board and a semiconductor chip.
- FIGS. 1 (to (d) and FIGS. 2 (a) to (d) are diagrams showing the basic steps of the bump forming method disclosed by the applicant of the present application in the above-mentioned patent application specification.
- solder powder 1 is formed on a wiring board 31 having a plurality of electrodes 32.
- the surface of the resin 14 and the substrate 40 are disposed.
- the extruded resin 14 self-assembles in a columnar shape at the interface with the electrode 32 of the wiring board 31 and the interface with the board 40 as shown in FIG. 2 (a).
- the resin 14 is further heated, as shown in FIG. 2 (b)
- the solder powder 16 contained in the resin 14 is melted, and the solder powder 16 contained in the resin 14 self-assembled on the electrode 32 Force S melt bond.
- the electrode 32 Since the electrode 32 has high wettability to the melt-bonded solder powder 16, bumps 19 made of molten solder powder are formed on the electrode 32 as shown in FIG. 2 (c). Finally, as shown in FIG. 2D, by removing the resin 14 and the substrate 40, the wiring substrate 31 in which the bumps 19 are formed on the electrodes 32 is obtained.
- a feature of this method is that the resin 14 supplied to the gap between the wiring substrate 31 and the substrate 40 is heated to generate bubbles 30 from the bubble generating agent, and the bubbles 30 grow to cause the resin 14 to grow.
- the resin 14 is self-assembled between the electrode 32 of the wiring board 31 and the board 40 by pushing out of the bubbles.
- FIG. 3 (a) is a view showing a state in which the resin 14 is pushed onto the electrode 32 of the wiring board 31 by the grown bubbles (not shown).
- the resin 14 in contact with the electrode 32 has an interfacial tension at the interface (a force resulting from the soaking and spreading of the resin) FS, which is greater than the stress F that generates a 77-viscosity resin.
- electrode 3 A columnar resin with the end of 2 as a boundary is formed between the electrode 32 and the substrate 40.
- the columnar resin 14 formed by self-assembly on the electrode 32 is subjected to stress Fb due to the growth (or movement) of the bubbles 30 as shown in FIG.
- the stress due to the viscosity ⁇ can be maintained by the action of F Ti, and the self-assembled resin 14 will not disappear.
- the self-assembled resin 14 can maintain a certain shape depends on the area S of the electrode 32 and the distance L of the gap between the electrode 32 and the substrate 40 in addition to the interfacial tension Fs. It also depends on the viscosity r? Qualitatively, it is considered that the following relationship is established, where T is a guideline for maintaining the resin 14 in a certain shape.
- this method uses the self-assembly due to the interfacial tension of the resin 14 to form the resin 14 on the electrode 32 in a self-aligning manner. Is a phenomenon that occurs on the electrode 32 narrowing in the gap formed between the wiring substrate 31 and the substrate 40 because the electrode 32 formed on the surface of the wiring substrate 31 is formed in a convex shape. It can be said that it was used.
- the solder powder dispersed in the resin can be efficiently self-assembled on the electrode, and the uniformity is excellent. Bump formation with high productivity can be realized.
- the above method is applied to the wiring substrate supplied with the resin. This is particularly useful when bumps are formed on all electrodes at once.
- bumps may be formed only on a part of the electrodes of the wiring board.
- the wiring substrate 31 shown in FIG. 4 is a case in which bumps are formed on the electrodes 32 that are the tips of the wiring.
- solder powder and a bubble generating agent are formed in the region 117 including the electrode 32.
- Resin 14 containing (not shown) is applied.
- bumps are formed on the electrodes 32 in the region 117 in a self-assembled manner.
- the resin 14 and the solder powder move to the region 119 other than the region 117, so that the solder spreads not only in the electrode 32 but also in the wiring 32e.
- solder powder aggregated on the wiring 32e we found an example in which solder powder is shifted and gathered due to a slight balance difference. Note that the dimension a in Fig. 4 is about lmm and the dimension b is about 1.25mm.
- FIG. 6 shows another example of the wiring pattern having the central portion in FIG.
- the present inventors observed the following phenomenon.
- Fig. 8 and Fig. 9 an example was found in which the solder powder gathered at a place unrelated to the land area.
- the solder powder gathered at this unrelated place as shown in Fig. 10, when the resin 14 moves through the substrate 40 and moves to the other part (see resin 14a, 14b, arrow 50). This seems to be based on the fact that the solder powder 16 has moved onto the electrode 33 that is not supposed to be formed.
- a phenomenon was observed in which the solder powder moved as the resin flowed farther between the wires.
- Bump formation conditions that can keep the movement of the resin 14 within a predetermined area are found by experiment or the like each time, and the conditions are strictly controlled, or the areas other than the predetermined area are masked. In any case, the force S, which is also possible, will impair the simplicity of this bump forming method.
- the inventor of the present application is not limited to the case where the fluid (fluid) 14 containing the solder powder 16 and the bubble generating agent is applied to the entire surface of the wiring substrate, and a part of the wiring substrate is used.
- the present inventors have intensively studied a method that can easily form solder bumps even when applied to regions, and have reached the present invention.
- FIGS. 11A to 11C are process cross-sectional views for explaining a bump forming method according to an embodiment of the present invention.
- a fluid 14 containing conductive particles 16 and a bubble generating agent (not shown) is formed on the first region 17 including the electrode 32 in the wiring board 31.
- the fluid 14 in the present embodiment is a resin. Specific examples of the conductive particles 16 and the bubble generating agent will be described later. .
- the first region 17 is often a region within a part of the range of the wiring board 31, but may be the entire region (or almost all) of the wiring substrate 31.
- the first region 17 is typically a region that is the same as or slightly wider than the region where the bump is formed.
- the first region 17 typically corresponds to the region where the bumps are formed, and the fluid 14 is supplied thereto, so the first region 17 is not restricted by the area, shape, etc.
- the wiring pattern is determined by the layout of the electrode (land).
- the first region 17 has a range corresponding to the dimension a X dimension b, for example, lmmX l. 25 mm or more.
- the area is in the same range.
- a substrate in which a projecting surface 13 having an area equivalent to the first region 17 is formed on the main surface 18 on the fluid 14. 40) is arranged. Specifically, the protruding surface 13 of the substrate 40 is disposed so as to face the first region 17 of the wiring substrate 31.
- the dimension and shape of the substrate 40 and the dimension “height (13h)” of the projection surface 13 can be specifically determined each time according to the pump formation conditions.
- the substrate 40 is a 1 cm ⁇ 1 cm square
- the protruding surface 13 is a 4 mm ⁇ 4 mm square and 400 m high (13 h).
- this example is merely an example, and is not limited to this size or shape.
- the substrate (plate member) 40 is, for example, a glass substrate.
- a ceramic substrate or a semiconductor substrate such as a silicon substrate
- a translucent substrate as the substrate 40 has the advantage of facilitating confirmation of the progress of the process and bump formation.
- a substrate for example, a glass substrate
- W W
- the fluid 14 When the fluid 14 is heated in the state shown in FIG. 11 (b), the bubbles 30 are generated from the bubble generating agent contained in the fluid 14 as shown in FIG. 11 (c).
- the fluid 14 is heated while being brought into contact with the protruding surface 13 of the substrate 40.
- a certain gap is provided between the electrode 32 formed on the wiring board 31 and the protruding surface 13 of the board 40, and the certain gap is larger than the particle diameter of the conductive particles 16. wide.
- the substrate 40 is fixed or held, and the fluid is heated.
- the fluid 14 is pushed out by the bubbles 30 as the generated bubbles 30 grow.
- the bubbles 30 generated from the bubble generating agent in the fluid 14 are discharged to the outside from the peripheral portion of the gap provided between the substrate 40 and the wiring substrate 31.
- the extruded fluid 14 gathers in a columnar shape at the interface between the wiring substrate 31 and the electrode 32 and the interface with the protruding surface 13 of the substrate 40.
- the conductive particles 16 in the fluid 14 gather on the electrode 32.
- the substrate 40 is moved in the vertical direction by an appropriate amount, so that the variation in height of the formed bumps can be suppressed.
- parallelism can be increased, for example, during metal bonding during flip chip mounting, which is performed after bump formation, and connection reliability can be increased.
- the wiring substrate 31 in which the bumps 19 are formed on the electrodes 32 is obtained.
- the fluid 14 may be removed along with the removal of the substrate 40.
- the fluid (resin) 14 may be left behind, but after forming the bumps, fine conductive particles (solder powder) are formed on the fluid 14. Since it may remain as a residue, it is preferable to remove the fluid 14 together with the residue as shown in FIG. 12 (d) in consideration of reliability.
- the projecting surface 13 is disposed on the surface of the fluid 14 supplied onto the first region 17 so as to face the first region 17, so that the fluid 14 is It can be kept on the first region 17 by surface tension. Therefore, when the fluid 14 is heated to generate the bubbles 30 such as the bubble generating agent, the fluid 14 can be prevented from moving beyond the first region 17 to other regions. As a result, if the pump 19 is selectively formed in the first region 17, the trouble of excluding the solder powder 16 that has moved to other than the first region 17 or masking in advance is required. It is possible to selectively and selectively form bumps with a simple method without the need. In addition, since the fluid 14 can be positively retained in the first region 17 by the surface tension, the conditions for selectively forming the bumps 19 in the first region 17 are eased, and the degree of freedom in process conditions is reduced. Also grows.
- the fluid 14 is pushed out of the bubbles by the growth of the bubbles 30, and the fluid 14 is self-assembled on the electrode 32 in the first region 17 by the effect.
- a pump 19 made of molten conductive particles is formed on the electrode 32 with high wettability. Can be formed in a self-aligning manner.
- the conductive particles 16 dispersed in the fluid 14 can be efficiently self-assembled on the electrode 32, and it has excellent uniformity and high productivity! / ⁇ pump can be formed on the electrode.
- FIG. 13 (a) is a top view similar to FIG. 4, and FIG. 13 (b) is a cross-sectional (side) view similar to FIG. 11 (b).
- the fluid 14 can be retained in the first region 17 by the protruding surface 13 of the substrate 40.
- the bump 19 is surely formed on the electrode (land) 32 in a self-assembled manner. That is, in the configuration of the present embodiment, the fluid 14 is in the first region 1 due to the surface tension by the protruding surface 13. 7 that the conductive particle force S collects at the location of the wiring 32e or a part of the electrode pattern other than the first region 17 and causes a short circuit. It can be prevented.
- the substrate 40 is disposed after the fluid 14 is supplied onto the wiring substrate 31.
- the present invention is not limited to this, and the first region 17 and the projecting surface 13 are first fixed to each other.
- a gap may be provided so as to be opposed to each other, and then the fluid 14 containing the conductive particles 16 and the bubble generating agent may be supplied to the gap.
- the fluid 14 containing the conductive particles 16 is pushed out of the bubbles, and as a result, the columnar shape is formed on the electrode 32.
- the conductive particles 16 contained in the aggregated fluid 14 can be melted to form the bumps 19 made of the molten conductive particles 16 on the electrode 32 in a self-aligning manner.
- the bumps 19 made of the conductive particles 16 can be formed in a self-assembled manner.
- the conductive particles 16 on the electrode 32 can be obtained with an appropriate amount of the conductive particles 16 without containing excessive conductive particles 16 in the fluid 14. It is possible to form the bumps 19 necessary for the process.
- the optimal content of the conductive particles 16 can be set as follows, for example.
- VA: VB SA: SB---(1)
- SA represents the total area of the electrodes 32 of the wiring board 31
- SB represents the area of a predetermined region (specifically, the first region 17 described above) of the wiring substrate 31.
- the content of the conductive particles 16 contained in the resin 14 is expressed by the following formula (2).
- the optimum content of the conductive particles 16 contained in the resin 14 is roughly as follows. It can be set based on the following equation (3).
- the above-mentioned parameter (soil c is for adjusting the excess and deficiency when the conductive particles 16 self-assemble on the electrodes 32 of the wiring board 31 and can be determined according to various conditions.
- the optimal conductivity can be obtained by Equation (3) with respect to the typical arrangement of the electrodes 32 as shown in FIGS.
- the content of the active particles 16 is calculated, the following values are obtained.
- the conductive particles 16 dispersed in the resin 14 should be contained in the resin 14 at a ratio of 0.5 to 30% by volume. It will be enough.
- the fluid 14 can be retained on the first region 17 by the surface tension using the substrate 40 on which the projection surface 13 is formed. Since the body 14 can be prevented from moving beyond the first region 17 to other regions, the conductive particles 16 can be further suppressed to an efficient amount. In other words, it is not necessary to consider the conductive particles 16 that move beyond the first region 17 (i.e., excess), and there is a small percentage that considers it. can do.
- the weight ratio of the conductive particles 16 to the resin 14 is about 7
- the ratio of 0.5 to 30% by volume corresponds to the ratio of 4 to 75% by weight.
- the step of self-assembling the fluid between the projection surface and the electrode of the wiring board may be performed while changing the gap between the projection surface and the wiring board. By doing so, the fluid can be efficiently self-assembled between the projection surface and the electrode.
- Figs. 16 and 17 show a fluid (resin paste) containing conductive particles and a bubble generating agent on a wiring board (FR-4 substrate) with 6 x 6 peripheral electrodes. Apply and add This is a heated example.
- Fig. 16 shows an example of an experiment carried out using a flat substrate (flat plate) with the protruding surface 13 formed, and as shown in Fig. 16, the force is also generated. Is completed, but the fluid (resin) flows out over a wide area. If there are other electrodes or wires in the flowed out area, there is a possibility that conductive particles will be gathered there.
- the substrate used in the example of FIG. 16 is a 1 cm ⁇ 1 cm square glass substrate.
- FIG. 17 shows an experimental example executed using the substrate on which the projecting surface 13 is formed. Note that this experiment was preliminarily performed for a fluid (resin) that does not contain conductive particles. As can be seen from FIG. 17, the fluid (resin) is self-assembled on the electrode.
- the substrate used in the example of Fig. 17 is a 1 mm XI cm square glass substrate with a convex processed part that becomes the protruding surface 13 formed as a 4 mm x 4 mm square with a height of 400 ⁇ m. .
- FIG. 18 was performed on a fluid (resin) containing conductive particles using the same substrate as in the experimental example of FIG. 17, and as can be seen from FIG. In addition, the fluid (resin) remains in a predetermined range (specifically, the first region) due to the surface tension effect of the projection surface.
- FIG. 19 shows that uniform bumps are neatly formed by the bump forming method of this embodiment.
- FIG. 20 is an SEM (striking electron microscope) photograph of the bump formed in this experimental example.
- FIG. 21 shows an experimental result example in which bumps are formed on a wiring board having a large number of electrodes (30 ⁇ 30).
- FIG. 21 shows an example of execution using a flat substrate (flat plate) on which no protruding surface 13 is formed.
- the pump is formed, a part of the conductive particles is observed. Flowing out of fluid (resin) was also observed.
- FIG. 22 shows an example of an experimental result performed using the same wiring board as that of FIG. 21 and using the board on which the protruding surface 13 is formed.
- the formation of the bumps was completed, and the shift of the conductive particles seen in FIG. 21 was not observed.
- the fluid stays within a predetermined range (specifically, the first region 17) by the surface tension effect of the projecting surface 13.
- the shift of the conductive particles seen in FIG. 21 is also the basis used in the example of FIG.
- the bump forming method of the present embodiment can be applied to all (or almost all) of the wiring board only when the fluid is supplied to a part of the wiring board. It can be understood that the present invention is also effective when supplying a fluid.
- the projection surface 13 of the substrate 40 has a flat surface, but is not limited thereto.
- the solder powder may be more easily self-assembled.
- the distance (distance) between the first region 17 and the projection surface 13 can be determined based on various conditions (for example, resin viscosity, solder powder particle size, electrode size, etc.). It is also preferable to form a metal on at least the surface of the convex pattern or electrode pattern 41.
- the electrode pattern 41 having a metallic force can be easily formed by a method such as printing. '
- a recess (or groove) is formed around the region 15 facing the first region 17 in the substrate 40, which is not only by forming the protruding surface 13 on the substrate 40. It can also be obtained by forming 20. This will be briefly described with reference to Fig. 24 (-(c)).
- FIG. 24 (a) conductive particles 16 and bubbles are generated on the first region 17 including the electrode 32 in a part of the wiring board 31.
- a fluid 14 containing an agent (not shown) is supplied.
- FIG. 24 (b) the substrate 40 having the recess 20 formed around the region 15 facing the first region 17 of the wiring substrate 31 is opposed to the first region 17 of the wiring substrate 31.
- the fluid 14 is sandwiched between the substrate 40 and the wiring substrate 31.
- the periphery of the fluid 14 is surrounded by the bottom 20 b of the recess 20.
- the fluid 14 remains on the first region 17 by surface tension even at the age shown in FIGS. 24 (b) and (c). It is done. Thereafter, the bump 19 is formed on the electrode 32 in a self-assembled manner in the same manner as described in FIGS. 12 (a) to 12 (d). '
- the convex pattern is formed on the surface of the substrate 40 (the surface facing the wiring substrate 31), similarly to the substrate shown in FIG.
- the electrode pattern 41 can be formed.
- the fluid 14, the conductive particles 16, and the bubble generating agent used in the present embodiment are not particularly limited, but the following materials can be used.
- the fluid 14 is not particularly limited as long as it has a viscosity that allows it to flow within the range of room temperature to the melting temperature of the conductive particles 16, and it can be reduced to a fluid viscosity by heating. Including what to do.
- Representative examples include thermosetting resins such as epoxy resins, phenol resins, silicone resins, diallyl phthalate resins, furan resins, melamine resins, polyester elastomers, fluororesins, polyimide resins, polyamide resins, aramid resins.
- a thermoplastic resin such as, a light (ultraviolet) curable resin, or a combination thereof can be used. In addition to resins, high boiling point solvents, oils, and the like can also be used.
- the material forces shown in FIGS. 25 and 26 can be used in an appropriate combination. If the melting point of the conductive particles 16 is higher than the boiling point of the bubble generating agent and the material is used, the fluid 14 is heated to generate bubble generating agent bubbles and self-assemble the fluid. Thereafter, the fluid 14 can be further heated to melt the conductive particles in the self-assembled fluid, and the conductive particles can be metal-bonded to each other.
- the bubble generating agent may be composed of two or more materials having different boiling points.
- a material that generates bubbles by thermal decomposition when the fluid 14 is heated may be used in addition to the materials listed in FIG. it can.
- the materials listed in FIG. 27 can be used. For example, when a compound containing crystallization water (aluminum hydroxide) is used, when the fluid 14 is heated, it is heated and water vapor is generated as bubbles.
- FIG. 28 schematically shows the bump forming apparatus 100 in the embodiment of the present invention.
- the bump forming apparatus 100 of the present embodiment is an apparatus for forming bumps on the wiring board 31.
- the stage 50 for mounting the wiring board 31 and the header 52 and the force arranged opposite to the stage 50 are used. Composed! /
- the shedder 52 includes an adsorption mechanism 53 that can adsorb the substrate (plate member) 40 disposed above the stage 50, and is a machine that can move up and down while adsorbing the plate member 40.
- at least one of the header 52 and the stage 50 is provided with a heating mechanism.
- the heating mechanism 60 is attached to the stage 50.
- the heating mechanism 60 in the present embodiment is a heater that can heat the wiring board 31.
- the heating mechanism can be attached to the header 52 together with the stage 50 so as to be heated from above and below.
- the wiring board 31 can be heated by the heating mechanism 60, and at the time of the heating, the header 52 is set at a predetermined interval (first step with respect to the stage 50).
- the plate-like member 40 can be held at an interval.
- the plate-like member 40 is adsorbed by the adsorbing mechanism 53 of the header 52, and the header 52 is moved upward in this state (arrow 55).
- a moving mechanism such as a motor. /.
- the wiring board 31 on which the electrodes 32 are formed is placed on the stage 50.
- Stage 50 is equipped with a mechanism that can hold and fix the wiring board 31.
- the substrate 31 can be fixed on the stage 50.
- a resin wiring substrate for example, FR-4 substrate
- a ceramic substrate or the like can be used.
- the wiring board 31 in this embodiment may be an intermediate board (interbosa) such as that used in a BGA (ball 'grid' array).
- the fluid 14 is applied to a region including the electrode 32 on the wiring substrate 31 by using a dispenser 70.
- the dispenser 70 is filled with a fluid (for example, resin paste) 14.
- the fluid 14 of this embodiment contains conductive particles and a bubble generating agent! / Speak.
- the fluid 14 in the present embodiment is a resin.
- the fluid 14 may be referred to as a paste.
- the present embodiment has been described from the state shown in FIG. 29 (a), it is of course possible to start the process from the state shown in FIG. 29 (b).
- the application method of the fluid (resin base) 14 is not limited to the application by the dispenser 70, and other methods can be used. '
- the header 52 is lowered (arrow 56), and the plate-like member 40 is moved closer to the stage 50.
- the paste 14 is sandwiched between the plate-like member 40 and the wiring substrate 31 arranged on the stage 50.
- the header 52 is moved via the paste 14 so that a predetermined interval (first interval) is formed between the wiring board 31 and the plate-like member 40.
- This predetermined interval (gap) is included in the paste! 1 /, wider than the particle size of the conductive particles.
- the stage 50 is heated using a heater 60 (the stage at the time of heating is expressed as “50aj”), and the paste 14 applied on the wiring board 31 is applied.
- the paste 14 applied on the wiring board 31 is applied.
- bubbles 30 are generated from the bubble generating agent contained in the paste 14, as shown in FIG.
- the header 52 holds the plate-like member 40 at a predetermined interval with respect to the stage 50. Since the plate-like member 40 is fixed by the header 52, Bubbles 30 from the foam generating agent pass through a wide area between the plate-like member 40 and the wiring board 31 (for example, a place in the wiring board 31 where the electrode 32 is not formed) to form a plate-like shape. It is discharged from the outer edge of member 4 and discharged.
- bumps 19 are formed on the electrodes 32 as shown in FIG. 32 (a). That is, the bumps 19 are formed on the electrodes 32 of the wiring board 31 through self-assembly of the resin based on the action of the bubbles 30 of the bubble generating agent and subsequent self-assembly of the solder.
- the predetermined interval (first interval) with respect to the header 52 relative to the stage 50 may be controlled so that the header 52 is fixed with a click when heat is applied, or the resin 52
- the header 52 may be controlled to perform a slight ascending operation (arrow 56) that slightly increases the interval according to the profile of the heating process.
- the header 52 may be controlled so as to change the interval just by spreading it in small increments. Such spacing control can be performed when the effect of increasing the bump height or making the bump height uniform is obtained. If varying intervals during the heating is also dependent on the process, by for example, a variation range of about 10% or less prospect for the first interval Bayoi. '
- the heating process of the paste 14 can be performed not only by heating from the stage 50 but also by heating from the header 52 through the plate-like member 40.
- a plate member 40 having a good thermal conductivity for example, a ceramic material.
- the bump 19 is formed on the electrode 32 of the wiring board 31 through the self-assembly of the resin and the subsequent self-assembly of the solder based on the action of the bubble 30 of the bubble generating agent. Stops heating the heater 60 and raises the header 52 as shown in FIG. 32 (b) (arrow 57). At this time, as shown in the figure, the header 52 may be lifted while leaving the plate member 40, and the header 52 may be lifted while the plate member 40 is adsorbed! /. It should be noted that the plate-like member 40 after the bump formation is completed is reused after being replaced with a new one or after being cleaned.
- the plate-like member 40 is moved in the vertical direction by an appropriate amount. As a result, height variations in the formed bumps 19 can be suppressed. As a result, the parallelism can be increased at the time of metal bonding performed after the bump formation, for example, flip chip mounting, and the connection reliability can be increased.
- FIG. 33 (a) the plate-like member 40 is removed, and as shown in FIG. 33 (b), the wiring board 31 is removed from the stage 50 and taken out. A wiring board 31 having bumps 19 formed thereon can be obtained.
- the plate-like member 40 when a semiconductor chip, for example, is used as the plate-like member 40, flip chip mounting can be performed using the bump forming method of the present embodiment. That is, it is possible to form a semiconductor mounting body (module) that is flip-chip mounted on the wiring substrate 31 without removing the plate-like member 40.
- the fluid 14 when the fluid 14 is a cured resin, the fluid 14 can be cured and used as an underfill. Note that the fluid 14 may be removed and then an underfill may be injected.
- FIG. 29 (a) to Fig. 33 (b) it is also possible to perform the steps shown in Fig. 29 (a) to Fig. 33 (b) in a flow manner by making the stage 50 movable.
- the plate-like member 40 is moved upward from the state shown in FIG. 32 (a) (or FIG. 32 (b)), and the wiring board 31 after bump formation is removed, as shown in FIG. 29 (b).
- the stage 50 is moved from the state shown in FIG. 29 (b) and brought below the dispenser 70, and the stage 50 is further moved after applying the paste, and FIG. 30 (a) to FIG. 31 (b ) (Or the subsequent steps up to FIG. 32 (a) or (b)) can be executed.
- a heating mechanism (heater) 60 and the header 52 can hold the plate-like member 40 during heating by the heating mechanism 60, so that the wiring board 31 is interposed on the stage 50.
- a fluid (paste) 14 containing conductive particles and a bubble generating agent When supplied, the heating mechanism (heater) 60 can generate the bubble generating agent bubbles 30, and the generated bubbles 30 can self-assemble the conductive particles on the electrodes 32 of the wiring board 31. As a result, bump formation with excellent productivity can be performed.
- the dispenser 70 is used to supply the paste to be the fluid 14, but various dispensers such as an air pulse type, a jet type, a screw type, and a mechanical type should be used as appropriate. Can do.
- the supply of the paste 14 is not limited to using a dispenser, and other methods can be used. For example, as shown in FIGS. 34 (a) and (b), the paste 14 can be applied to the wiring board 31 by using a one-dollar member 72 that can be dated.
- the needle member 72 is lowered (arrow 76) and stabbed into the portion where the paste 14 is stocked, so that the surface tension of the handle member 72 is increased. Use it to remove part 14a of paste 14 (arrow 77).
- the needle member 72 holding the part 14 of the paste 14 is applied onto the wiring board 31 (arrow 78), and then the udle member. Pull up 72 (arrow 79). ''
- the paste 14 can be supplied onto the wiring board 31.
- the amount of paste 14 required on the wiring board 31 is small (or very small)
- a small amount can be easily accommodated.
- the dispenser 70 is installed, it may be an expensive bump device.
- the two-dollar member 72 is a simple instrument, such a problem can be relatively easily solved by using the needle member 72. Can be avoided.
- the paste 14 may be supplied by printing using a mask 73 and a squeegee 74 as shown in FIG.
- the blade 14 may be supplied by a blade using a blade device 75.
- a mechanism for rotating the plate member 40 can be provided.
- Fig. 37 shows the configuration of the bump forming device 100 as seen from above. is doing.
- the bump forming device 10O has a mechanism capable of rotating the plate-like member 40, and the cleaning device 80 is arranged in a region different from the header 52.
- the plate-like member 40 is rotated (arrow 82) and brought to the location of the cleaning device 80 to wash the plate-like member 40. Then, the plate-like member 40 is rotated again (arrow 83), and bump formation can be performed again at the location of the header 52.
- This rotation mechanism may be provided in the header 52 or may be provided in a location different from the header 52.
- the inventor of the present application conducted an experiment to form a bump 19 of a narrow pitch array type (for example, an electrode 32 pitch of about 500 ⁇ m or less).
- a narrow pitch array type for example, an electrode 32 pitch of about 500 ⁇ m or less.
- V the pitch is not narrow, but if the wiring board 31 is placed below (that is, the stage 50 side), it can be heated from below (stage 50).
- Bump 19 could be formed without problems such as short-circuiting, even when the upper force was heated (heating of the side force) and the upper force was also heated (heating of the plate-like member 40 side force).
- the wiring board 31 when it is arranged on the upper side (that is, on the header 52 side), it can be heated from below (heating on the stage 50 side) or heated from above (on the plate member 40 side force). A case where a short circuit occurred between the formed bumps 19 was observed.
- bumps 19 may be relaxed to some extent without strictly controlling the process conditions according to the material used. It was possible to form. For example, when a wiring board 31 made of resin is placed on the lower side and a heating process with a temperature increase rate of 310 ° C / second, 155 ° C / second, and 103 ° CZsecond is executed (heating time is 30 seconds), the bumps 19 could be formed without problems such as short circuit.
- a ceramic heater can be used for example.
- the fluid 14 containing the conductive particles 16 is pushed out of the bubbles, and as a result, the columnar shape is formed on the electrode 32.
- the conductive particles contained in the assembled fluid 14 can be melted to form the bumps 19 made of the conductive particles 16 melted on the electrode 32 in a self-aligning manner.
- Bumps 19 made of electrically conductive particles melted in a self-assembled manner can be formed.
- the conductive particles can be efficiently self-assembled on the electrode 32, the conductive particles are necessary on the electrode 32 with an appropriate amount of conductive particles without containing excessive conductive particles in the fluid 14. Bump 19 can be formed.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/280,907 US7905011B2 (en) | 2006-03-16 | 2007-02-22 | Bump forming method and bump forming apparatus |
CN2007800086829A CN101401494B (zh) | 2006-03-16 | 2007-02-22 | 凸块形成方法及凸块形成装置 |
JP2008506209A JP5002583B2 (ja) | 2006-03-16 | 2007-02-22 | バンプ形成方法 |
EP07715091.0A EP1996002B1 (en) | 2006-03-16 | 2007-02-22 | Bump forming method and bump forming apparatus |
KR1020087022747A KR101257977B1 (ko) | 2006-03-16 | 2007-02-22 | 범프형성방법 및 범프형성장치 |
Applications Claiming Priority (4)
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JP2006-072316 | 2006-03-16 | ||
JP2006072316 | 2006-03-16 | ||
JP2006084569 | 2006-03-27 | ||
JP2006-084569 | 2006-03-27 |
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WO2007108290A1 true WO2007108290A1 (ja) | 2007-09-27 |
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PCT/JP2007/053866 WO2007108290A1 (ja) | 2006-03-16 | 2007-02-22 | バンプ形成方法およびバンプ形成装置 |
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US (1) | US7905011B2 (ja) |
EP (1) | EP1996002B1 (ja) |
JP (1) | JP5002583B2 (ja) |
KR (1) | KR101257977B1 (ja) |
CN (1) | CN101401494B (ja) |
WO (1) | WO2007108290A1 (ja) |
Cited By (1)
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CN101853794A (zh) * | 2009-03-24 | 2010-10-06 | 松下电器产业株式会社 | 电子元器件接合方法和凸点形成方法及其装置 |
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US7640659B2 (en) * | 2005-09-02 | 2010-01-05 | Panasonic Corporation | Method for forming conductive pattern and wiring board |
KR101257977B1 (ko) * | 2006-03-16 | 2013-04-24 | 파나소닉 주식회사 | 범프형성방법 및 범프형성장치 |
JP5159273B2 (ja) * | 2007-11-28 | 2013-03-06 | ルネサスエレクトロニクス株式会社 | 電子装置の製造方法 |
US9627254B2 (en) * | 2009-07-02 | 2017-04-18 | Flipchip International, Llc | Method for building vertical pillar interconnect |
KR101940237B1 (ko) * | 2012-06-14 | 2019-01-18 | 한국전자통신연구원 | 미세 피치 pcb 기판에 솔더 범프 형성 방법 및 이를 이용한 반도체 소자의 플립 칩 본딩 방법 |
JP7014307B2 (ja) * | 2018-11-22 | 2022-02-01 | 株式会社村田製作所 | 伸縮性配線基板及び伸縮性配線基板の製造方法 |
US11812562B2 (en) * | 2021-08-30 | 2023-11-07 | International Business Machines Corporation | Creating a standoff for a low-profile component without adding a process step |
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- 2007-02-22 US US12/280,907 patent/US7905011B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
CN101401494A (zh) | 2009-04-01 |
CN101401494B (zh) | 2010-12-22 |
US7905011B2 (en) | 2011-03-15 |
EP1996002A4 (en) | 2011-06-15 |
JPWO2007108290A1 (ja) | 2009-08-06 |
JP5002583B2 (ja) | 2012-08-15 |
US20090229120A1 (en) | 2009-09-17 |
EP1996002A1 (en) | 2008-11-26 |
KR101257977B1 (ko) | 2013-04-24 |
KR20080112237A (ko) | 2008-12-24 |
EP1996002B1 (en) | 2017-07-05 |
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