WO2001097276A1 - Microparticle arrangement film, electrical connection film, electrical connection structure, and microparticle arrangement method - Google Patents
Microparticle arrangement film, electrical connection film, electrical connection structure, and microparticle arrangement method Download PDFInfo
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- WO2001097276A1 WO2001097276A1 PCT/JP2001/005014 JP0105014W WO0197276A1 WO 2001097276 A1 WO2001097276 A1 WO 2001097276A1 JP 0105014 W JP0105014 W JP 0105014W WO 0197276 A1 WO0197276 A1 WO 0197276A1
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/16—Non-insulated conductors or conductive bodies characterised by their form comprising conductive material in insulating or poorly conductive material, e.g. conductive rubber
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
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- H05K3/3457—Solder materials or compositions; Methods of application thereof
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- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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- H01L2224/05571—Disposition the external layer being disposed in a recess of the surface
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/11—Manufacturing methods
- H01L2224/113—Manufacturing methods by local deposition of the material of the bump connector
- H01L2224/1133—Manufacturing methods by local deposition of the material of the bump connector in solid form
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- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
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- H05K2201/10378—Interposers
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- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
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Definitions
- the present invention relates to a fine particle arrangement film in which specific fine particles are arranged on a film, a conductive connection film used for electrical connection between fine electrodes, a conductive connection structure, and a method for arranging fine particles.
- Conventional technology a fine particle arrangement film in which specific fine particles are arranged on a film, a conductive connection film used for electrical connection between fine electrodes, a conductive connection structure, and a method for arranging fine particles.
- the method of disposing fine particles at a specific position on a film includes a method of mechanically placing individual particles, a method of transferring previously arranged particles to a film, and a method of applying an adhesive or the like to a specific position of a film.
- a method of applying and spraying fine particles on the fine particles and attaching the fine particles thereto, and a method of dispersing fine particles in a paste and applying the same have been used.
- connection portion When connecting such minute opposing electrodes, it is usually necessary to seal the periphery of the connection portion with a resin due to the problem that the strength of each connection portion is weak. Usually, this sealing is performed by injecting a sealing resin after connecting the electrodes. However, there is a problem that it is difficult to inject the sealing resin uniformly in a short time because the distance between the connection portions of the fine counter electrode is short.
- conductive fine particles are mixed with Pinda resin.
- Anisotropic conductive adhesives in the form of a film or paste can be considered.
- anisotropic conductive adhesives usually have conductive fine particles randomly dispersed in the insulating adhesive, the conductive fine particles are continuous in the binder, or fine particles that are not on the counter electrode flow during heating and pressing. May cause leakage at adjacent electrodes.
- a thin layer of an insulating material is likely to remain between the electrode and the fine particles, so that there is a problem that connection reliability is reduced.
- the present invention provides a method for efficiently and easily arranging specific fine particles in an arbitrary position in a stable state without any excess or shortage, and an arranged film, that is, basically, one particle in one hole.
- the method of arranging the fine particles, the fine particle arrangement film, and the fine electrodes facing each other are connected to each other by using a film in which conductive fine particles are arranged at an arbitrary position. It is an object of the present invention to provide a conductive connection film and a conductive connection structure that can easily and easily perform electrical connection with high connection reliability in a short time.
- the present invention relates to a fine particle-arranged film in which fine particles having an average particle diameter of 5 to 800 / zm, an aspect ratio of less than 1.5, and a CV value of 10% or less are arranged.
- a hole having a hole diameter of 12 to 2 times the average particle diameter of the fine particles, an aspect ratio of less than 2, and a CV value of 20% or less is provided, and the fine particles are arranged on or in the surface of the hole. It is a fine particle arrangement film.
- the fine particles are preferably spherical particles having an average particle diameter of 20 to: L 50 ⁇ , an aspect ratio of less than 1.1, a CV value of 2% or less, a ⁇ value of 400 to 15,000 N / mm 2 , and a recovery rate of
- the coefficient of linear expansion at room temperature is 5% or more, and the coefficient of linear expansion at room temperature is 10 to 200 ⁇ > ⁇ , the ⁇ value is 2000 to 8000 N / mm 2 , the recovery rate is 50% or more, and the coefficient of linear expansion at room temperature is 30. More preferably, it is 100100 ppm.
- high molecular weight Preferably, the core has a body, and a structure having a metal coating layer is preferred. In the case of fine particles having a metal coating layer, the thickness of the metal coating layer is 0.
- the metal preferably contains nickel or gold.
- the fine particle-arranged film of the present invention is used as a conductive connection film, the fine particles are preferably conductive fine particles having a resistance value of 3 ⁇ or less, and are preferably conductive fine particles having a resistance value of 0.05 ⁇ or less. More preferably, there is.
- a conductive connection structure formed by using the conductive connection film is also one aspect of the present invention.
- the thickness of the film used for the fine particle-arranged film of the present invention is preferably 1/2 to 2 times the average particle size of the fine particles, and more preferably 3 to 4 to 1.3 times. Further, the Young's modulus of the film surface is preferably 1 OGPa or less. Further, the film preferably has a property of being adhered by pressing or heating, and preferably has a property of being cured by heating or UV irradiation. When the film has a curing property, the coefficient of linear expansion after curing is preferably from 10 to 200 ppm.
- the holes have an average hole diameter on the surface of 45 to: L times the average particle diameter of the fine particles, a CV value of 5% or less, and an aspect ratio of less than 1.3.
- the hole is preferably tapered or stepped in the thickness direction.
- the average hole diameter on the back surface of the film is preferably equal to or less than the average hole diameter on the surface of the film, and is preferably 50% or more of the average hole diameter on the surface of the film. More preferably, it is not more than the hole diameter and at least 80% of the average hole diameter on the film surface. It is preferable that the above-mentioned hole is formed by using a laser.
- the fine particle-arranged film of the present invention can be obtained by a fine particle arranging method in which fine particles are sucked from the back surface of a film having substantially no tack on the front surface.
- the suction of the fine particles I is performed by suctioning the gas, and the degree of vacuum on the suction side is 110 kPa or less when the average particle size of the fine particles is 800 to 200 ⁇ m.
- the average particle diameter of the fine particles is 200 to 40 ⁇ m, it is less than 120 kPa, and when the average particle diameter of the fine particles is less than 40 m, it is 130 kPa. It is preferably at most Pa.
- the above arrangement method is air purge Alternatively, it is preferable to include a step of removing extra adhering particles with a brush, and a step of pressing a film on which fine particles are arranged.
- FIG. 1 is a diagram showing one embodiment of a process for producing a conductive connection structure of the present invention.
- 1 represents a film
- 2 represents conductive fine particles
- 3 represents a mouthpiece
- 4 represents IC
- 5 represents a substrate
- 6 represents an electrode
- 7 represents a protective film.
- the average particle size of the fine particles is 5 to 800 m.
- the above average particle diameter can be obtained by observing 100 arbitrary particles with a microscope.
- the average particle size is less than 5 m, it is difficult to attract the particles, or the fine particles cannot be substantially arranged in the hole because the fine particles adhere or aggregate due to static electricity or the like.
- it exceeds 800 / xm it can be arranged without inconvenience even by the conventional method.
- the fine particle-arranged film of the present invention when used as a conductive connection film, if the average particle diameter is less than 5 ⁇ m, the particles do not come into contact with the electrodes due to the problem of the accuracy of the smoothness of the electrodes and the substrate, resulting in poor conduction. If it exceeds 800 ⁇ m, it will not be able to handle fine pitch electrodes and short-circuits will occur at adjacent electrodes.
- the average particle size of the fine particles is preferably from 10 to 300 / m, more preferably from 20 to 150 ⁇ , and still more preferably from 40 to 80 im.
- the aspect ratio of the fine particles is less than 1.5.
- the above aspect ratio is a value obtained by dividing the average major axis of the particles by the average minor axis.
- the aspect ratio is 1.5 or more, the particles are not uniform. Many particles clog the holes.
- the fine particle-arranged film of the present invention is When used as an electrical connection film, the short diameter portion does not reach the electrode, causing a connection failure.
- the above aspect ratio is preferably less than 1.3, more preferably less than 1.1, and if it is less than 1.05, the effect is significantly enhanced.
- the fine particles used in the present invention are spheroidized by using surface expansion in a deformable state. It is preferable to make the particles spherical.
- the CV value of the fine particles is 10% or less.
- the CV value is represented by ( ⁇ / Dn) X I 00% (where ⁇ represents the standard deviation of the particle diameter, and D n represents the number average particle diameter). If the CV value exceeds 10%, the particle diameters become uneven, so that the particles are large, the particles are shifted or small from the holes in the film, and many particles are clogged in the holes. When the fine particle-arranged film of the present invention is used as a conductive connection film, when the CV value exceeds 10%, small particles do not reach the electrodes, which causes poor connection.
- the above CV value is preferably 5% or less, more preferably 2% or less, and if it is 1% or less, the effect is remarkably enhanced.
- the fine particles used in the present invention need to have a uniform particle size by classification or the like.
- the fine particles among others, spherical particles having an average particle diameter of 20 to 150 / m, an aspect ratio of less than 1.1 and a CV value of 2% or less are preferable.
- fine particles used in the present invention for example, high molecular weight substances; inorganic substances such as silica, ⁇ / remina, metal, carbon and the like and low molecular weight compounds can be used, but moderate elasticity, flexibility and recoverability can be used. It is preferable to use a high molecular weight core as it is easy to obtain spherical particles.
- the high-molecular-weight polymer examples include a phenol resin, an amino resin, an acrylic resin, an ethylene monoacetate resin, a styrene-butadiene block copolymer, a polyester resin, a urea resin, a melamine resin, an alkyd resin, a polyimide resin, and urea resin.
- Thermoplastic resins such as tan resins and epoxy resins; curable resins, cross-linked resins, and organic-inorganic hybrid polymers. Of these, crosslinked resins are preferred from the viewpoint of heat resistance. Further, a filler may be included as necessary.
- the fine particles are required to further have mechanical characteristics 4, it is preferable that the fine particles have a K value of 400 to 15,000 N / mm ⁇ a recovery rate of 5% or more and a linear expansion coefficient at room temperature of 10 to 200 ppm.
- the K value of the fine particles is preferably 400 to 1500 ON / mm 2 .
- the K value is expressed as (3 / ⁇ 2) ⁇ F ⁇ S- 3 / 2 ⁇ R 1/2 and F is 20.
- C load value at 10 ° / 0 compression deformation (N)
- S is the value expressed by compression displacement (mm)
- R is the value expressed by radius (mm).
- the K value is preferably from 1,000 to 10,000, more preferably from 2,000 to 8,000, and still more preferably from 3,000 to 6,000.
- the fine particles used in the present invention preferably have a recovery rate of 5% or more at 20 ° C. and 10% compression deformation. If the recovery rate is less than 5%, when the gap between the opposing electrodes spreads momentarily due to impact or the like, it cannot follow the spread, and the electrical connection may become momentarily unstable.
- the above-mentioned recovery rate is preferably at least 20%, more preferably at least 50%, and a remarkable effect can be obtained when the recovery rate is more than 80%.
- the fine particles used in the present invention preferably have a linear expansion coefficient at room temperature of 10 to 200 ppm. If the coefficient of linear expansion is less than 10 ppm, the difference in linear expansion between the film and the film is so large that it cannot follow the elongation of the film during thermal cycling, etc., and the electrical connection may become unstable. . Conversely, if it exceeds 200 ppm, if the film is adhered to the substrate when the film is adhered to the substrate due to excessive thermal stress, stress will be concentrated on the connection part of the electrode. It may cause poor connection. You.
- the linear expansion coefficient is preferably from 20 to 150 ppm, and more preferably from 30 to 100 ppm.
- the fine particles have a K value of 2000 to 800 NZmm 2 , a recovery rate of 50% or more, and a linear expansion coefficient at room temperature of 30 to 100 ppm.
- the fine particle-arranged film of the present invention is used as a conductive connection film, the fine particles need to be conductive fine particles.
- the conductive fine particles those obtained by providing a metal coating layer as a conductive layer on a high molecular weight core are preferably used.
- the metal is not particularly limited, but may include nickel or gold.
- the surface layer is preferably made of gold from the viewpoint that contact resistance with the electrode, conductivity and oxidation deterioration do not occur.
- the conductive fine particles have a barrier layer for forming a multilayer and an adhesion between the core and the metal. It is preferable to provide a nickel layer for improving ⁇ 4.
- the thickness of the metal coating layer is preferably 0.3 ⁇ or more. If it is less than 0.3 / zm, the metal coating film may peel off when handling the conductive fine particles. In addition, when the fine particle-arranged film of the present invention is used as a conductive connection film, sufficient conduction cannot be obtained, or the metal coating film is broken when pressurized to connect the counter electrode, causing a connection failure. It may be. More preferably, it is not less than 1. ⁇ , more preferably not less than 2.0 / xm. On the other hand, the thickness of the metal coating layer is preferably 1/5 or less of the particle diameter of the fine particles so as not to lose the characteristic "I" production of the high molecular weight substance as the core.
- the conductive resistance of the conductive fine particles When the conductive resistance of the conductive fine particles is compressed by 10% of the average particle diameter, the conductive resistance of a single particle, that is, the resistance value is preferably 3 ⁇ or less. If the conductive resistance exceeds 3 ⁇ , it may not be possible to secure a sufficient current value, or it may not be able to withstand large voltages, and the device may not operate normally.
- the above-mentioned conductive resistance is preferably 0.3 ⁇ or less, more preferably 0.05 ⁇ or less, and even if it is 0.01 ⁇ or less, it is possible to cope with a current-driven element while maintaining high reliability. The effect is remarkably enhanced.
- Examples of the film used for the fine particle-arranged film of the present invention include, for example, Inorganic substances such as ceramics, metals, and carbon, and low molecular weight compounds can be used, but high molecular weight substances and their composites can be easily obtained because they have moderate elasticity, flexibility, and recoverability. Composites are preferred.
- Examples of the high-molecular-weight polymer include a phenol resin, an amino resin, an acrylic resin, an ethylene monoacetate resin, a styrene-butadiene block copolymer, a polyester resin, a urea resin, a melamine resin, an alkyd resin, a polyimide resin, and urea resin.
- Thermoplastic resins such as tan resins and epoxy resins; curable resins, cross-linked resins, organic-inorganic hybrid polymers, and the like.
- epoxy resins are preferred because they have few impurities and are easily obtained in a wide range of physical properties.
- Epoxy resins include mixtures of uncured epoxy and the above resins and those in a semi-cured state.
- the film may contain an inorganic filler such as glass fiber or alumina particles.
- the thickness of the film is preferably 1/2 to 2 times the average particle size of the fine particles. If the average particle diameter is less than 1 to 2, the arranged particles are likely to shift from the holes. Further, when the fine particle-arranged film of the present invention is used as a conductive connection film, it is difficult to support the substrate at the film portion. If it exceeds twice, surplus particles tend to enter the holes. Further, when the fine particle-arranged film of the present invention is used as a conductive connection film, the fine particles do not reach the electrode, which causes a connection failure.
- the thickness of the film is preferably 2 to 3 to 1.5 times, more preferably 3 to 4 to 1.3 times, and 0.8 to 1.2 times the average particle size of the fine particles. More preferably, it is 0.9 to 1.1 times.
- the thickness of the film when there is a bump on a device or an electrode of a substrate, the thickness of the film may be at least one time the average particle diameter of the fine particles. Conversely, when there is no bump, it is preferably 1 times or less.
- the film has a surface Young's modulus of 1 OGPa or less. Exceeding this may damage the particles or cause them to fly off when subjected to slight external forces.
- the Young's modulus is preferably 2 GPa or less, and a remarkable effect is obtained at 0.5 GPa or less.
- the film used in the present invention preferably has an adhesive property by pressing or heating. No.
- the fine particle-arranged film of the present invention is used as a conductive connection film, if the electrodes of the element and the substrate are aligned with the conductive fine particles of the film, they can be connected only by pressing or heating.
- the film used in the present invention is preferably cured by heating or UV irradiation, whereby the reliability of the connection can be drastically improved.
- the film used in the present invention preferably has a coefficient of linear expansion at room temperature after curing of 10 to 200 ppm.
- the coefficient of linear expansion is less than 10 ppm, the difference in linear expansion from the fine particles is large, so when used as a conductive connection film, thermal cycling or the like cannot follow the elongation of the fine particles when applied. Electrical connection may be unstable. Conversely, if it exceeds 200 ppm, the gap between the electrodes becomes too wide when a thermal cycle or the like is applied, and the fine particles may separate from the electrodes and cause poor connection.
- the linear expansion coefficient is preferably from 20 to: 150 ppm, more preferably from 30 to 100 ppm.
- holes having an average hole diameter of 1/2 to 2 times the average particle diameter of the fine particles, an aspect ratio of less than 2, and a CV value of 20% or less are provided at an arbitrary position on the film surface.
- the particles are located on or in the surface of the hole.
- the average hole diameter of the holes is 1 to 2 times the average particle diameter of the fine particles. If the average particle size of the fine particles is less than 1/2, the arranged particles are likely to shift from the holes. In addition, when the fine particle-arranged film of the present invention is used as a conductive connection film, the particles are hard to reach from the back surface, so that the particles do not reach the electrode and cause a connection failure. On the other hand, if it exceeds twice, surplus particles may enter the holes or penetrate the film and fall off the film.
- the average hole diameter is preferably 2/3 to 5 times the average particle diameter of the fine particles, more preferably 5 to 1.3 times, more preferably 4 to 5 to 1.3 times, and still more preferably 0.9 to 1.
- the aspect ratio of the hole is less than 2.
- the aspect ratio of the hole is the flatness of the hole diameter. It is the value obtained by dividing the average major axis by the average minor axis. If the aspect ratio is 2 or more, the fine particles may shift from the hole in the film or a large number of fine particles may clog the hole. Further, when the fine particle-arranged film of the present invention is used as a conductive connection film, the fine particles do not reach the electrodes, which causes a connection failure.
- the aspect ratio is preferably 1.5 or less, more preferably 1.3 or less, and even more preferably 1.1 or less.
- the CV value of the above hole is less than 20%.
- the CV value of a hole is represented by (H 2 0112) X I 00% ( ⁇ 2 represents the standard deviation of the hole diameter, and Dn 2 represents the average hole diameter). If the CV value of a hole exceeds 20%, the hole diameter will be uneven, so that a small hole will cause the particles to shift from the hole in the film, and a large hole will cause a large number of particles to clog or the particles to penetrate.
- the fine particle-arranged film of the present invention is used as a conductive connection film, the fine particles do not reach the electrodes, which causes poor connection.
- the CV value of the hole is preferably 10% or less, more preferably 5% or less, and the effect is remarkably enhanced at 2% or less.
- the average hole diameter, aspect ratio, and CV value of the above holes indicate the average hole diameter, CV value, and aspect ratio in the state of suction when the fine particles are arranged by suction.
- those having an average hole diameter of 4/5 to 1.3 times the average particle diameter of the fine particles, a CV value of 5% or less, and an aspect ratio of less than 1.3 are preferable.
- the hole is preferably tapered or stepped in the thickness direction from the front surface to the back surface.
- the suctioned particles are more stably arranged, and are less likely to be displaced.
- the average hole diameter on the back surface when the holes are viewed from the rear surface is preferably not more than the average hole diameter on the film surface, and preferably not less than 50% of the average hole diameter on the film surface. If the average hole diameter on the back surface is larger than the average hole diameter on the front surface, the arranged particles are likely to be displaced from the holes and the particles may penetrate the film. If the average hole diameter on the back surface of the film is less than 50% of the average hole diameter on the front surface, the arranged particles are likely to shift from the holes.
- the fine particle-arranged film of the present invention when used as a conductive connection film, if the average hole diameter on the back surface of the film is less than 50% of the average hole diameter on the front surface, the particles do not reach the electrode because the particles are difficult to reach from the back surface. Failure to do so.
- Average hole diameter on the back of the film is good More preferably, it is 70% or more of the average hole diameter on the surface, more preferably 80% or more, and further preferably 90 to 95%.
- a hole is provided at an arbitrary position of the film having substantially no tack on the surface (the entrance side of the fine particles) when the fine particles are sucked, and the fine particles are sucked from the back surface of the film so that the fine particles are placed on the surface of the holes
- it can be produced by a method of arranging it inside.
- the method for arranging the fine particles is also one of the present invention.
- substantially no tack is defined as a component perpendicular to the film thickness direction at least with respect to the particles arranged in the hole of the film and the particles not arranged in the state of suction.
- a hole-forming process using a laser is preferable.
- the laser for drilling include a carbon dioxide gas laser, a YAG laser, and an excimer laser.
- the type of laser to be used is determined in consideration of the required dimensional accuracy and cost.
- the degree of vacuum on the suction side preferably conforms to the following conditions.
- the average particle diameter of the fine particles is 800 to 200 m, 1 kPa or less
- the average particle diameter of the fine particles is 200 to 40 / zm, 1 kPa or less
- If the average particle size of the fine particles is less than 40 ⁇ m, it is not more than 30 kPa.If the degree of vacuum is lower than this, the suction force is weak, and the fine particles are not sufficiently sucked. It becomes easy.
- the degree of vacuum is not more than 25 kPa (average particle size 800 to 200 / zm), -35 kPa or less (average particle size 200 to 40, mn), or -45 kPa or less (average particle size (Less than 40 ⁇ m in diameter), more preferably less than 40 kPa (average particle diameter 800-200 m), less than 50 kPa (average particle diameter 200-40 / zm), less than -60 kPa ( The average particle size is less than 40 ⁇ m).
- the film itself may be deformed by suction, particularly if the film has flexibility. Therefore, it is preferable to provide a support plate at the suction port during suction.
- the support plate is not particularly limited as long as it does not inhibit suction, and examples thereof include a mesh.
- the fine particle-arranged film of the present invention When the fine particle-arranged film of the present invention is used as a conductive connection film, excess fine particles adhering to the film may cause a short circuit between adjacent electrodes. Therefore, the extra fine particles are removed with an air purge or a brush, a blade, a squeegee, or the like. It preferably includes a step. Above all, it is more preferable to remove the fine particles with a brush while sucking them.
- a light press it is preferable to apply a light press to the film on which the fine particles are arranged, for the purpose of stabilizing the arrangement.
- the arranged fine particles are remarkably stable, and no drop due to displacement or the like is caused.
- an adhesive or a sealant may be applied later from the front surface or the rear surface to fix the arranged fine particles.
- the center of gravity of the arranged fine particles is preferably in the film. In the film, it is extremely stable compared to the case where the center of gravity is outside the film surface, and there is no drop due to misalignment.
- the fine particles are easily charged and tend to cause adhesion and aggregation of the particles. Therefore, it is preferable to dispose the fine particles while performing static elimination.
- the surface of the arranged fine particles is preferably exposed on both sides of the film.
- the surface of the fine particles is exposed on both sides of the film, more reliable connection can be made when the fine particle arrangement film of the present invention is used as a conductive connection film.
- the application of the fine particle-arranged film of the present invention is not particularly limited, and examples thereof include an optical film, a sensor, a switching film, and a conductive connection film.
- an optical film such as liquid crystal displays, personal computers, and portable communication devices
- a conductive connection film used when connecting and connecting various electrodes.
- the above conductive connection The film is also one of the present invention. In this case, conductive fine particles are used as the fine particles.
- the above substrates are roughly classified into a flexible substrate and a rigid substrate.
- a resin sheet having a thickness of 50 to 500 m and made of polyimide, polyamide, polyester, polysulfone, or the like is used as the flexible substrate.
- the rigid substrates are roughly classified into those made of resin and those made of ceramic.
- Examples of the above-mentioned resin include those made of glass fiber reinforced epoxy resin, phenol resin, cellulose fiber reinforced phenol resin and the like.
- Examples of the above-mentioned ceramic made of silicon dioxide, alumina etc. What is it? .
- a more rigid substrate is preferable from the viewpoint that the fine particles can be sufficiently pressed against the electrode.
- a single-layer structure may be used, or a plurality of layers may be formed by means such as through-hole formation to increase the number of electrodes per unit area.
- a multi-layer substrate for making electrical connection with each other may be used.
- the above components are not particularly limited, and include, for example, active components such as semiconductors such as IC and LSI; passive components such as capacitors and crystal oscillators; and bare chips.
- the conductive connection film of the present invention is particularly suitable for bare chip bonding. Furthermore, bumps are usually required when bare chips are joined by flip chips, but when the conductive connection film of the present invention is used, bumpless connection is possible because fine particles serve as bumps. There is a great merit that a complicated process in bump production can be omitted.
- an electrode that is easily oxidized such as an aluminum electrode can be connected by breaking the oxide film.
- An electrode is formed on the surface of the substrate or component.
- the shape of the electrode is not particularly limited, and examples thereof include a stripe shape, a dot shape, and an arbitrary shape.
- Examples of the material of the electrode include gold, silver, copper, nickel, palladium, carbon, aluminum, and ITO. In order to reduce the contact resistance, copper, nickel or the like further coated with gold may be used.
- the thickness of the electrode is preferably 0.1 to 100 ⁇ m.
- the width of the electrode is preferably 1 to 500 ⁇ .
- FIG. 1 shows an embodiment of the method for producing a conductive connection film of the present invention and a method for producing a conductive connection structure using the conductive connection film.
- a tapered hole is made in the film 1 using a laser.
- the suction hole 3 is applied to the surface of the film 1 having the smaller hole diameter so as to cover all the holes formed in the film 1 and prevent air leakage, and the conductive fine particles 2 are sucked.
- a conductive connection film in which the conductive fine particles 2 are arranged one by one in each hole formed in the film 1 without any excess or shortage is obtained.
- a conductive connection film is placed on the substrate 5 provided with the electrodes 6 at regular intervals with the holes formed in the film 1 so that the electrodes 6 and the conductive fine particles 2 are in contact with each other.
- the ICs 4 having the electrodes 6 provided at equal intervals are stacked so that the surface on which the electrodes 6 are formed faces downward, and the electrodes 6 and the conductive fine particles 2 are in contact with each other, and then heated and pressed. . Thereby, a conductive connection structure in which the substrate 5 and the IC 4 are electrically connected by the conductive connection film is obtained.
- a crimping machine equipped with a heater is used.
- an adhesive may be supplementarily applied to the film surface and used.
- a conductive connection structure such as a substrate or a component connected using the conductive connection film is also one of the present invention. '
- conductive fine particles can also be used as a material for forming a bump.
- the conductive fine particles of the disposition film of the present invention are placed on the electrode of the chip so as to come on the electrode, and pressed while pressing.
- the pump can be manufactured by a method such as fixing.
- silver paste or the like may be used as an auxiliary.
- the fine particle placement film of the present invention is capable of efficiently arranging fine particles easily and stably at an arbitrary position of the film without any excess or shortage by sucking specific fine particles from the back surface of the film having specific holes. Thus, it is possible to obtain a film in which fine particles are stably arranged at an arbitrary position.
- a fine counter electrode can be formed without electrical leakage of an adjacent electrode and an electrical connection with high connection reliability. Connections and connection structures can be easily obtained in a short time.
- the methylmethacrylic cross-linked copolymer obtained by the suspension polymerization was classified by a sieve and airflow classification to obtain microspheres having an average particle size of 150 ⁇ , an aspect ratio of 1.05, and a CV value of 2%.
- 32 holes were formed in a 2 cm square polyester film with a Young's modulus of 2 GPa, a thickness of 150 ⁇ , and a square of 0.5 mm pitch.
- a 120 m tapered hole was drilled so that the hole had a CV value of 3% and an aspect ratio of 1.05.
- a suction port with a diameter of 7 mm is placed on the back side of the film, and all the holes in the film are covered, and suction is performed at a vacuum of 50 kPa while applying no leakage.
- each hole in the film had one or more particles placed one after the other.
- static elimination was performed so that fine particles did not adhere.
- After adsorbing and disposing the fine particles gently press the film between glass plates to release the vacuum and stabilize the fine particles. I did it. The center of gravity of the fine particles was in the film, and the particles did not leave the holes even when the film was vibrated.
- Fine polystyrene particles with an average particle size of 250 / m, an aspect ratio of 1.15, and a CV value of 4% were prepared. Also, 32 holes were formed in a polyimide film with a Young's modulus of 6 GPa, a thickness of 180 m, and a size of 2 cm square so as to form a square shape at a pitch of 0.5 mm, using a CO 2 laser with a surface of 220 / zm and a back surface of 190 mm. It was drilled so as to have a ⁇ taper shape and a hole CV value of 6% and an aspect ratio of 1.25. By using a CO 2 laser, desired dimensions and shapes could be obtained with high accuracy.
- a suction port with a diameter of 7 mm is placed on the back side of this film to cover all the holes of the film and to prevent leakage.
- the dibulbenzen copolymer obtained by seed polymerization was classified by a sieve and wet classification to obtain fine spheres. Thereafter, a nickel layer having a thickness of 0.2 / zm was formed by electroless plating, and a gold layer having a thickness of 2.3 / zm was further formed by electric plating. The particles were further classified, with an average particle size of 75 / zm, an aspect ratio of 1.03, a CVjtl% NK value of 400 N / mm, a recovery rate of 60%, a linear expansion coefficient at room temperature of 50 ppm, and a resistance of 0.01 ⁇ . Was obtained.
- Young's modulus 0.4 GPa, thickness 68 m, 1 c Two rows of 18 holes separated by about 3 mm at a pitch of about 300 m so that the electrode of the IC chip is aligned with the semi-cured epoxy film of m square size, C 0 2
- the laser was opened in a tapered shape with a front surface of 75 ⁇ and a back surface of 68 m so that the CV value of the hole was 2% and the aspect ratio was 1.04.
- the use of C 0 2 laser it was possible to accurately obtain the desired dimensions' shape.
- a suction port of 8 mm in diameter is placed on the back side of this film, covering all the holes in the film and not leaking.Then, while sucking at a vacuum of 65 kPa, approach the fine particles and absorb the fine particles. went.
- the mouthpiece was equipped with a SUS mesh with openings of 50 // m for supporting the film. Within a few seconds, the particles were placed in each hole of the film one by one without excess or shortage. During this time, static elimination was performed so that fine particles did not adhere. Also, although there was almost no extra particles attached, the surface was swept with a soft brush to remove foreign substances just in case. After adsorbing the fine particles, the film was sandwiched between glass plates and pressed lightly to break the vacuum and stabilize the fine particles. The center of gravity of the particles was in the film, and the particles did not leave the holes even when the film was vibrated.
- the conductive connection film obtained in this manner is placed on the FR-4 substrate on which the electrode pattern is drawn so that the position of the electrode and the position of the conductive fine particles are aligned, and lightly pressed and temporarily pressed, and then the chip
- the position of the aluminum electrode was aligned with the position of the conductive fine particles by heating and pressing, and the epoxy resin was cured to perform flip chip bonding.
- the linear expansion coefficient of the cured epoxy resin at room temperature was 50 ppm.
- connection structure thus obtained operates normally because stable conduction is obtained at all electrodes and there is no leakage at adjacent electrodes.
- a thermal cycle test of C was performed 100 ° times, but no abnormalities were found in the connection resistance increase or operation at low or high temperatures.
- the fine particles of the methyl methacrylic cross-linked copolymer were provided with a 0.1 m-thick layer by electroless plating, and further, a gold layer with a thickness of 0.9 / zm was provided by electric plating.
- Average particle size 45 m, aspect ratio J l .05, CV value 2%, K value 200 N / mm 2 , recovery rate 50%, linear expansion coefficient at room temperature 80 ppm, resistance value 0 0.3 ⁇ metal-coated microspheres were obtained.
- the holes were separated by about 2 mm and two rows were tapered with an excimer laser so that the front surface was 43 / im and the back surface was 38 ⁇ m, and the holes were opened so that the CV value of the holes was 2% and the aspect ratio was 1.05.
- an excimer laser desired dimensions and shapes could be obtained with high accuracy.
- a suction port with a diameter of 5 mm is placed on the back side of this film so as to cover all the holes in the film and to prevent leakage.
- the suction is performed at a vacuum of 65 kPa while approaching the fine particles to absorb the fine particles. went. Within a few seconds, the particles were placed in each hole of the film one by one without any excess or shortage. During this time, static elimination was performed so that fine particles did not adhere. In addition, although there was almost no extra particles attached, the surface was swept with a soft brush to remove foreign substances just in case. After adsorbing the fine particles, the film was sandwiched between glass plates and pressed lightly to release the vacuum and stabilize the fine particles. The center of gravity of the fine particles is in the film and even if the film is vibrated, the particles will not leave the hole.
- the conductive connection film thus obtained is placed on the ceramic substrate on which the electrode pattern is drawn so that the position of the electrodes and the position of the conductive fine particles match, and after being heated gently and temporarily pressed, about
- the position of the gold electrode on the chip with the gold bump of 20 m and the position of the conductive fine particles were aligned by heat and pressure, and the epoxy resin was cured to perform flip chip bonding.
- the linear expansion coefficient of the cured glass-epoxy at room temperature was 30 ppm.
- connection structure thus obtained operates normally because all the electrodes have stable conduction and there is no leakage at the adjacent electrodes.
- the thermal cycle test of C was performed 100 times. I did not always see it.
- a nickel layer having a thickness of 0 was attached to the microspheres of the crosslinked epoxy resin particles by electroless plating, and a gold layer having a thickness of 0 was attached by electroless displacement plating.
- the particles were classified into an average particle size of 200 m, an aspect ratio of 1.1, a CVffi of 2%, a K value of 300 ON / mm 2 , a recovery of 70%, a linear expansion coefficient at room temperature of 60 ppm, and a resistance of 0.3 ⁇ .
- a metal-coated microsphere was obtained.
- a suction port with a diameter of 7 mm is placed on the back side of the film so as to cover all the holes in the film and to prevent leakage.
- I went. In about 10 seconds, almost all of the particles were placed in each hole of the film, one by one. During this time, static elimination was performed so that fine particles did not adhere. Very rarely, extra particles adhered near the hole, but could be easily removed by sweeping the surface with a soft brush. After adsorbing the fine particles, the film was sandwiched between glass plates and lightly pressed to release the vacuum and stabilize the fine particles. The center of gravity of the fine particles was in the film, and the particles did not leave the holes even when the film was vibrated.
- the conductive connection film thus obtained is placed on a FR-4 substrate on which the electrode pattern is drawn so that the position of the electrode and the position of the conductive fine particles are aligned with each other.
- the epoxy resin was cured by heat and pressure bonding to perform flip chip bonding.
- the cured epoxy resin had a linear expansion coefficient at room temperature of 80 ppm.
- connection structure obtained in this way had a high conduction resistance, but it was still conducting properly, and was subjected to a thermal cycle test at 125 to 100 ° C for 100 times. But it was not so high. In addition, there was almost no increase in the resistance value of the connection at both low and high temperatures.
- Example 5 a nickel layer having a thickness of 0.4 ⁇ was attached by electroless plating to microspheres of silica instead of the epoxy resin particles, and a gold layer having a thickness of 0.1 / iii was attached by electroless displacement plating.
- the particles were classified, the average particle diameter was 200 / zm, the aspect ratio was 1.1, the C Vf [i 2%, the K value was 160 N / mm 2 , the recovery rate was 95%, A metal-coated microsphere having a linear expansion coefficient of 10 ppm at room temperature and a resistance of 0.3 ⁇ was obtained.
- connection structure obtained in this way had a high conduction resistance, but it was still conducting properly, and when subjected to a thermal cycle test at 125 to 100 ° C for 100 times, the resistance of the connection structure was reduced. The rise was seen, but not to a problem. Although conduction became slightly unstable at high temperatures, and noise and other noises were found in the impact test, it was considered that some devices could be used satisfactorily.
- Example 7 In Example 5, a non-crosslinked acryl microsphere was replaced with a 0.4 m thick nickel layer by electroless plating instead of the epoxy resin particles. Layered. The particles were classified, average particle diameter 200 // m, aspect ratio 1.1, CV value 2%, K value SO ONZmm 2 recovery rate 4%, linear expansion coefficient at room temperature 150 ppm, resistance value 0.3 ⁇ Was obtained.
- connection structure obtained in this way had a high conduction resistance, it was all conducting properly, and when subjected to a thermal cycle test at 25 to 100 ° C 1000 times, the resistance was found to increase. It wasn't problematic. Although conduction became slightly unstable at low temperatures and some noises were found in the impact test, it was considered that some devices could be used satisfactorily.
- Example 5 except that a ceramic film having a Young's modulus of 20 GPa was used instead of the epoxy film, the particles were adsorbed in the same manner. Particles were observed being flicked away, and it took some extra time to place them. In addition, although a small scratch or peeling was observed on a part of the coating metal of the arranged particles, there was no practical problem. .
- the divinylbenzene copolymer obtained by seed polymerization was classified by a sieve and wet classification to obtain microspheres. Thereafter, a nickel layer having a thickness of 0.2 m was applied by electroless plating, and a gold layer having a thickness of 1.8 ⁇ was further applied by electric plating. The particles were further classified to have an average particle size of 75 / zm, an aspect ratio of 1.03, and a CV value of 1. / 0 , ⁇ value 3800 Metal-coated microspheres having an N / mm 2 recovery rate of 60%, a linear expansion coefficient at room temperature of 50 ppm, and a resistance value of 0.01 ⁇ were obtained. The conductive fine particles thus obtained were observed, but no peeling or the like of the metal coating film was observed.
- a pitch of about 300 / m is applied to a semi-cured epoxy film with a Young's modulus of 0.4 GPa, a thickness of 68 / zm, and a size of 1 cm square to align with the electrodes of the IC chip.
- C_ ⁇ 2 laser was it is possible to get high accuracy desired size and shape.
- a suction port with a diameter of 8 mm is applied to the back side of this film so as to cover all the holes in the film and to prevent leakage.
- the near fine particles were adsorbed.
- the mouthpiece was provided with a SUS mesh having an aperture of 50 / zm for supporting the film.
- each hole in the film had one or more particles placed one after the other.
- the charging was performed so that the fine particles did not adhere.
- the surface was swept with a soft brush to remove foreign substances just in case.
- the film was sandwiched between glass plates and lightly pressed to release the vacuum and stabilize the fine particles. The center of gravity of the fine particles was in the film, and the particles did not leave the holes even when the film was vibrated.
- the conductive film obtained in this way is placed on the FR-4 substrate on which the electrode pattern is drawn so that the position of the electrode and the position of the conductive fine particles are aligned, and then lightly pressed and temporarily pressed, and then the chip is formed.
- the position of the aluminum electrode was aligned with the position of the conductive fine particles by heat and pressure bonding, and the epoxy resin was cured to perform flip chip bonding.
- the linear expansion coefficient of the cured epoxy resin at room temperature was 50 ppm. Observation of the conductive fine particles after thermocompression bonding revealed no peeling of the metal coating film due to rupture.
- connection structure thus obtained operates normally because stable conduction is obtained at all electrodes and there is no leakage at adjacent electrodes, and a thermal cycle test at 125 to 100 ° C was performed at 100 ° C. The test was performed 0 times, but there were no abnormalities in the increase in resistance or operation at the connection at low or high temperatures. In addition, an impact test was conducted, but no noise was found or no instantaneous disconnection occurred.
- Example 1 an attempt was made to obtain a fine particle arranging film in the same manner except that microspheres having an aspect ratio of 1.5 and a CV value of 15% were used, but a large number of fine particles escaped to the vacuum side during suction. There was a hole in which two or more particles clogged, and flat particles and large particles were once drawn and placed, but they shifted when the vacuum was released.
- Example 1 an attempt was made to obtain a fine particle arrangement film in the same manner as in Example 1 except that the hole diameter on the film surface was set to 70 m and the rear surface was set to 50 m. Some particles were displaced even in the state, and most of the particles were displaced when the vacuum was released.
- Example 1 an attempt was made to obtain a fine particle-arranged film in the same manner except that the hole diameter on the film surface was set to 310 ⁇ ⁇ and the back surface was set to 250 ⁇ , but the fine particles escaped to the vacuum side. The particles could not be located.
- Example 1 an attempt was made to obtain a film having fine particles arranged therein, except that the holes on the film surface had an aspect ratio of 2 and a CV value of 25% .However, many fine particles escaped to the vacuum side during suction. There was a hole in which two or more particles were clogged, and some particles were sucked and arranged once, but shifted when the vacuum was released. (Comparative Example 5)
- Example 1 As in Example 1, an attempt was made to adsorb methyl methacrylic crosslinked copolymer fine particles having an average particle size of 4 m into a thin film of polyester with a hole of about 3 to 4 tm. There was too much adhesion and it could not be arranged properly.
- Example 3 flip-chip bonding was attempted in the same manner except that an ACF was prepared by randomly dispersing metal-coated microspheres in an epoxy film, and this was used. Electrodes for which conduction was not obtained occurred. Although the amount of the conductive fine particles was gradually increased, a portion where the adjacent electrode leaked occurred on the way. Also, when large particles came to the chip other than the electrodes, the load was concentrated on the chip and the chip's protective film was destroyed.
- Example 4 a conductive connection film using microspheres having an aspect ratio of 1.5 and a CV value of 12% was prepared, and flip-chip bonding was performed using this conductive connection film in the same manner as in Example 4. Even when the thermal pressure conditions were changed, a large number of electrode parts that did not conduct were suddenly damaged.
- Example 3 a conductive connection film was prepared using metal-coated microspheres having a nickel layer having a thickness of 0.1 ⁇ by electroless plating and a gold layer having a thickness of 0.1 / zm by electric plating. Then, flip-chip bonding was performed using this conductive connection film in the same manner as in Example 3, but the metal coating layer was destroyed and the electrode that was not electrically connected was not obtained. Many parts occurred. Industrial applicability
- the present invention Since the present invention has the above-described configuration, by sucking specific fine particles from the back surface of a film having a specific hole, the fine particles can be easily and efficiently placed at an arbitrary position on the film without excess or shortage in a stable state.
- the film can be arranged, and a film in which the fine particles are stably arranged at an arbitrary position can be obtained.
- a fine counter electrode by using a specific film in which specific conductive fine particles are arbitrarily arranged, a fine counter electrode can be connected without leakage of an adjacent electrode, and has a highly reliable electrical connection and connection structure. The body can be obtained easily in a short time.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01938634A EP1310992A1 (en) | 2000-06-14 | 2001-06-13 | Microparticle arrangement film, electrical connection film, electrical connection structure, and microparticle arrangement method |
US10/311,227 US20040106334A1 (en) | 2000-06-14 | 2001-06-13 | Microparticle arrangement film, electrical connection film, electrical connection structure, and microparticle arrangement method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2000178716 | 2000-06-14 | ||
JP2000-178716 | 2000-06-14 |
Publications (1)
Publication Number | Publication Date |
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WO2001097276A1 true WO2001097276A1 (en) | 2001-12-20 |
Family
ID=18680106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/005014 WO2001097276A1 (en) | 2000-06-14 | 2001-06-13 | Microparticle arrangement film, electrical connection film, electrical connection structure, and microparticle arrangement method |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040106334A1 (ja) |
EP (1) | EP1310992A1 (ja) |
KR (1) | KR20030007947A (ja) |
CN (1) | CN1434980A (ja) |
WO (1) | WO2001097276A1 (ja) |
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- 2001-06-13 KR KR1020027016853A patent/KR20030007947A/ko not_active Application Discontinuation
- 2001-06-13 WO PCT/JP2001/005014 patent/WO2001097276A1/ja not_active Application Discontinuation
- 2001-06-13 CN CN01810874A patent/CN1434980A/zh active Pending
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Also Published As
Publication number | Publication date |
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EP1310992A1 (en) | 2003-05-14 |
CN1434980A (zh) | 2003-08-06 |
KR20030007947A (ko) | 2003-01-23 |
US20040106334A1 (en) | 2004-06-03 |
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