WO2008044357A1 - Structure connectée et son procédé de fabrication - Google Patents
Structure connectée et son procédé de fabrication Download PDFInfo
- Publication number
- WO2008044357A1 WO2008044357A1 PCT/JP2007/059210 JP2007059210W WO2008044357A1 WO 2008044357 A1 WO2008044357 A1 WO 2008044357A1 JP 2007059210 W JP2007059210 W JP 2007059210W WO 2008044357 A1 WO2008044357 A1 WO 2008044357A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductive adhesive
- adhesive film
- surface electrode
- wiring member
- conductive
- Prior art date
Links
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- 238000004519 manufacturing process Methods 0.000 title description 6
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- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0512—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module made of a particular material or composition of materials
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L31/02—Details
- H01L31/02002—Arrangements for conducting electric current to or from the device in operations
- H01L31/02005—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
- H01L31/02008—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
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- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- H01L2224/29199—Material of the matrix
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- H01L2224/29338—Base material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/29339—Silver [Ag] as principal constituent
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- H—ELECTRICITY
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
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- H01L2224/29347—Copper [Cu] as principal constituent
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
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- H01L2224/29338—Base material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/29355—Nickel [Ni] as principal constituent
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- H—ELECTRICITY
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29298—Fillers
- H01L2224/29399—Coating material
- H01L2224/294—Coating material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
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- H—ELECTRICITY
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83192—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on another item or body to be connected to the semiconductor or solid-state body
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- H—ELECTRICITY
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
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- Y10T29/49002—Electrical device making
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- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T428/24372—Particulate matter
Definitions
- the present invention relates to a method for connecting a surface electrode of a solar battery cell and a wiring member, a conductive adhesive film, and a solar battery module.
- a solar cell module has a structure in which a plurality of solar cells are connected in series and Z or in parallel via a wiring member electrically connected to a surface electrode thereof.
- solder has been used to connect the surface electrode of the solar battery cell and the wiring member when manufacturing the solar battery module (see, for example, Patent Documents 1 and 2).
- Solder is widely used because it has excellent connection reliability such as electrical conductivity and adhesion strength, is inexpensive and versatile.
- Patent Documents 3 to 6 disclose methods for connecting wirings with a conductive adhesive such as a conductive paste.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-204256
- Patent Document 2 Japanese Patent Laid-Open No. 2005-050780
- Patent Document 3 Japanese Patent Laid-Open No. 2000-286436
- Patent Document 4 Japanese Patent Laid-Open No. 2001-357897
- Patent Document 5 Japanese Patent No. 3448924
- Patent Document 6 JP-A-2005-101519
- connection method using solder described in Patent Documents 1 and 2 tends to cause deterioration of the characteristics of solar cells. This is because when a solder having a melting point of about 230 to 260 ° C is melted, a member such as a semiconductor structure in the solar cell is heated, and the influence of Z or solder volume shrinkage on the semiconductor structure or the like. Due to the range. Also, In the wiring connection by soldering, it is difficult to control the distance between the electrode and the wiring, so that it is difficult to obtain sufficient dimensional accuracy during packaging. Lowering the dimensional accuracy also leads to a decrease in product yield due to packaging.
- connection member as a substitute for solder, and has a sufficiently excellent connection reliability and a surface electrode and a wiring member of a solar battery cell. It is an object to provide a connection method, a conductive adhesive film, and a solar cell module.
- the present invention is a method for electrically connecting a surface electrode of a solar battery cell and a wiring member via a conductive adhesive film in order to solve the above-mentioned problem, wherein the conductive adhesive film is insulated.
- Conductive particles containing conductive adhesive and conductive particles, with the 10-point average roughness of the surface in contact with the conductive adhesive film of the surface electrode being Rz (m) and the maximum height being Ry ( ⁇ m) Provided is a connection method in which the average particle diameter r (m) is not less than the ten-point average roughness Rz and the thickness t ( ⁇ m) of the conductive adhesive film is not less than the maximum height Ry.
- the present invention is a conductive adhesive film used for electrically connecting a surface electrode of a solar battery cell and a wiring member, comprising an insulating adhesive and conductive particles,
- the average particle diameter r (m) of the conductive particles is the 10-point average roughness, where the surface roughness of the surface electrode in contact with the conductive adhesive film is Rz (m) and the maximum height is Ry (m).
- Conductive adhesion that is Rz or more and the thickness t (m) of the conductive adhesive film is more than the maximum height Ry Provide film.
- connection method of the present invention is such that the average particle diameter r force of the conductive particles contained in the conductive adhesive film is a ten-point average roughness Rz or more on the surface of the surface electrode of the solar battery cell in contact with the conductive adhesive film. It is one of the features. Thereby, the electroconductive particle contained in an electroconductive adhesive film can electrically connect the surface electrode and wiring member of a photovoltaic cell sufficiently reliably.
- connection method of the present invention is that the thickness t of the conductive adhesive film is equal to or greater than the maximum height Ry of the surface electrode of the solar battery cell in contact with the conductive adhesive film.
- a conductive adhesive film can adhere
- connection method of the present invention can sufficiently improve the connection reliability.
- connection method of the present invention does not require the use of solder to connect the surface electrode of the solar cell and the wiring member, the effect of heating the member and the volume shrinkage of the conductive adhesive film Can be sufficiently reduced.
- the ten-point average roughness Rz and the maximum height Ry are values derived in accordance with JIS-B0604-1994, and are observed with an ultra-deep shape measurement microscope and with image measurement / analysis software. It is derived by calculation.
- the average particle size r of the conductive particles is determined by observing the conductive particles with a scanning electron microscope (SEM), randomly extracting 20 particles, measuring the particle size of these particles, This is a value calculated as an arithmetic average of the particle diameters.
- the thickness t of the conductive adhesive film is a value measured by a micrometer.
- the elastic modulus of the conductive adhesive film is a value measured as follows. First, an insulating adhesive is applied onto a peelable substrate film to form a coating film. The coating is then heated in an oven at 170 ° C for 20 minutes. Thereafter, the base film is peeled off to obtain a film made of a heated product of the coating film. Cut the film into strips with a width of 5 mm and a length of 35 mm to obtain test pieces. For the test piece, the storage elastic modulus at 25 ° C is measured using a dynamic viscoelasticity measuring device, and the value is taken as the elastic modulus of the conductive adhesive film.
- the wiring member of the solar battery cell is preferably a film-like conductive member. This makes it easier to control the distance between the surface electrode of the solar battery cell and the wiring member at the time of connection, thereby further improving the dimensional accuracy during packaging.
- the film-shaped conductive member is mainly composed of one or more metals selected from the group consisting of Cu, Ag, Au, Fe, Ni, Pb, Zn, Co, Ti, and Mg. It is preferable to include as. The inclusion of these metals further improves the conductivity of the wiring member, leading to further improvement in connection reliability.
- connection reliability can be further significantly improved.
- the fill factor (hereinafter referred to as “FF”) can be kept high for a long time.
- FIG. 1 is a schematic cross-sectional view showing a part of a conductive adhesive film according to an embodiment.
- FIG. 2 is a schematic cross-sectional view showing a part of the connection structure according to the embodiment.
- FIG. 3 is a schematic diagram showing a main part of a solar cell module according to an embodiment.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of the conductive adhesive film of the present invention.
- the conductive adhesive film 10 of this embodiment contains at least conductive particles 1 and an adhesive component 2.
- FIG. 2 is a schematic cross-sectional view showing a part of a connection structure obtained by a connection method for connecting a surface electrode of a solar battery cell and a wiring member using the conductive adhesive film of the present invention. is there.
- this connection structure 200 the surface electrode 3 of the solar battery cell, the conductive adhesive film 10, and the wiring member 4 are laminated in this order.
- the conductive adhesive film 10 of the present embodiment is for connecting the surface electrode 3 of the solar battery cell and the wiring member (wiring wire) 4 for connecting the solar battery cell in series and Z or in parallel. It is.
- Solar cells have electrodes (surface electrodes) formed on the front and back surfaces to extract electricity.
- the surface electrode 3 a known material capable of obtaining electrical conduction can be cited. Specific examples thereof include, for example, a general silver-containing glass paste, a silver paste in which various conductive particles are dispersed in an adhesive resin, a gold paste, a carbon paste, a nickel paste, an aluminum paste, and a baking paste. For example, ITO formed by vapor deposition.
- the glass paste electrode containing silver is used suitably from the point of being excellent in heat resistance, electroconductivity, and stability, and a low-cost viewpoint.
- a silver paste and an aluminum paste are applied by screen printing or the like onto at least one of Si single crystal, polycrystal, and non-crystalline substrates by screen printing or the like. It is mainly that the Ag electrode and the A1 electrode are provided as the surface electrode 3 by drying and firing, respectively.
- the conductive adhesive film 10 includes at least an adhesive component 2 and conductive particles 1 dispersed therein.
- the adhesive component 2 is not particularly limited as long as it exhibits adhesiveness. However, from the viewpoint of further improving the connection reliability, the adhesive component 2 is preferably a composition containing a thermosetting resin.
- the thermosetting resin may be a known one. Examples thereof include epoxy resin, phenoxy resin, acrylic resin, polyimide resin, polyamide resin, and polycarbonate resin. . These thermosetting resins can be used singly or in combination of two or more. Among these, from the viewpoint of further improving the connection reliability, one or more thermosetting resins selected from the group consisting of epoxy resins, phenoxy resins, and acrylic resins are preferable.
- the adhesive component 2 may be a composition containing a known curing agent and curing accelerator as optional components in addition to the thermosetting resin.
- this adhesive component 2 is modified with a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, etc. in order to improve the adhesion and wettability with the surface electrode 3 and the wiring member 4.
- a dispersant such as calcium phosphate or calcium carbonate may be contained.
- this adhesive component 2 is added to the surface electrode 3, the wiring member 4, and the conductive particles 1 which may contain rubber components such as acrylic rubber, silicon rubber, and urethane in order to control the elastic modulus and tackiness.
- a chelate material or the like may be contained in order to suppress the silver or copper madalation.
- the elastic modulus of the conductive adhesive film 10 is preferably 0.5 GPa to 4. OGPa from the viewpoint of reducing warpage of the surface electrode 3 after bonding and compressive stress during bonding. 0.9 GPa to 3 5GPa is more preferred. If the elastic modulus of the conductive adhesive film 10 is 0.5 GPa or more, it is possible to further prevent a decrease in adhesive strength due to poor film strength. 4. If it is OGPa or less, it has excellent stress relaxation properties, The warpage and breakage of the surface electrode 3 can be further suppressed.
- the elastic modulus of the conductive adhesive film 10 is measured as follows. First, on the surface of a polyethylene-treated polyethylene terephthalate film, an adhesive component that is a precursor of the conductive adhesive film 10 is applied by a manipulator (manufactured by YOSHIMISU) to form a coating film. The coating is then dried in an oven at 170 ° C for 20 minutes. Thereafter, the polyethylene terephthalate film is peeled off to obtain a conductive adhesive film 10 having a film thickness of 25 ⁇ m or 35 ⁇ m. The resulting conductive adhesive film 10 was 5mm wide and 35mm long. The storage elastic modulus at 25 ° C was measured using a dynamic viscoelasticity measurement device (Rheometric Scientific, trade name “SOLIDS ANALYZER”, distance between chucks: 2 cm). The modulus of elasticity.
- the conductive particle 1 is not particularly limited as long as it has conductivity and is solid in the manufacturing environment and the usage environment of the connection structure 200.
- Examples of the conductive particles 1 include metal particles such as gold particles, silver particles, copper particles, and nickel particles, or conductive or insulating particles such as gold-plated particles, copper-plated particles, and nickel-plated particles.
- Examples include conductive particles obtained by coating the surface of the core particles with a conductive layer such as a metal layer.
- the core particles that are preferred are particles in which the surface of the core particles is covered with a conductive layer.
- the conductive layer is metal-plated. That is, conductive particles obtained by coating the surfaces of plastic particles with a metal layer are preferable because the particles themselves have high followability to fluctuations such as vibration and expansion after connection.
- the compounding amount of the conductive particles 1 dispersed in the conductive adhesive film 10 is based on the total volume of the conductive adhesive film 10 from the viewpoint of connection reliability after the adhesive component 2 is cured. 0.5 to 20% by volume is preferred 2. 2.0 to 12% by volume is more preferred. If the blending amount of the conductive particles 1 is less than 0.5% by volume, the physical contact with the surface electrode 3 tends to decrease, and in the reliability test atmosphere (85 ° C 85% RH) The connection resistance of the connection structure 200 tends to decrease. In addition, if the blending amount of the conductive particles 1 exceeds 20% by volume, the relative amount of the adhesive component 2 is reduced, so that the adhesive strength of the connection structure 200 is improved in the reliability test atmosphere (85 ° C 85% RH). It tends to decrease.
- the average particle diameter of the conductive particles 1 is r (m)
- the average particle diameter r is not less than the ten-point average roughness Rz ( ⁇ m) of the surface Se of the surface electrode 3.
- the film thickness of the conductive adhesive film 10 is t m, see FIG. )
- the film thickness t is equal to or greater than the maximum height Ry (m) of the surface Se of the surface electrode 3.
- the surface Se of the surface electrode 3 may generally have unevenness with an elevation difference of 3 to 30 ⁇ m. Especially when the surface electrode 3 is provided in the solar battery cell, There is a tendency for the unevenness of the unevenness to become rough at 8-18 m. As a result of intensive studies, the present inventors have found that the connection reliability is not sufficient in the conventional solar cell due to the unevenness.
- connection reliability can be improved.
- the relationship between the surface roughness of the surface Se of the surface electrode 3 and the average particle diameter of the conductive particles 1 and the film thickness of the conductive adhesive film 10 was found to affect the connection reliability.
- the correlation between the average particle diameter r of the conductive particles 1 and the ten-point average roughness Rz of the surface Se of the surface electrode 3, and the film thickness t of the conductive adhesive film 10 and the surface of the surface electrode 3 It was found that the correlation strength with the maximum height Ry of Se affects the connection reliability.
- the average roughness of the portion of the surface Se of the surface electrode 3 with a large difference in height becomes the factor that determines the average particle size !: of the surface electrode 3
- the roughness of the largest difference in height in Se is considered to be a factor determining the film thickness t of the conductive adhesive film 10.
- connection reliability in the connection structure 200 is not sufficient.
- the film thickness t of the conductive adhesive film 10 becomes thinner than the maximum height Ry of the surface Se of the surface electrode 3, the conductive adhesive film 10 may be filled without any gap between the surface electrode 3 and the wiring member 4. It becomes difficult, and the adhesion between the surface electrode 3 and the wiring member 4 becomes insufficient. As a result, the connection reliability in the connection structure 200 is not sufficient.
- the average particle diameter r of the conductive particles 1 is preferably 1 ⁇ m or more larger than the ten-point average roughness Rz of the surface Se of the surface electrode 3 and more preferably 3 ⁇ m or more. More preferably, it is larger than 5 ⁇ m. Thereby, the connection failure between the surface electrode 3 and the wiring member 4 can be suppressed more sufficiently.
- the upper limit of the difference between the average particle diameter r and the ten-point average roughness Rz is preferably 2 / 3Rz ⁇ m, more preferably Rz ⁇ m. If these differences are Rz ⁇ m or less, especially 2Z3Rz ⁇ m or less, the conductive particles 1 are physically recessed. Therefore, there is an advantage that the connection resistance is reduced.
- the average particle diameter r of the conductive particles 1 is preferably 3 to 30 ⁇ m from the viewpoint of improving uniform dispersibility in the adhesive component 2 and is preferably 8 to 25 ⁇ m. More preferred.
- the film thickness t of the conductive adhesive film 10 is preferably 1 ⁇ m or more larger than the maximum height Ry of the surface Se of the surface electrode 3 and more preferably 3 m or more 5 m. It is particularly preferable that the value is larger. Thereby, the filling of the conductive adhesive film 10 becomes further sufficient, and connection failure can be more sufficiently suppressed.
- the upper limit of the difference between the film thickness t and the maximum height Ry is preferably 20 m, more preferably 10 m. If these differences are 20 m or less, particularly 10 m or less, the fluidity of the resin in the adhesive component 2 and the curability of the resin during thermocompression bonding are further improved, and the advantage that the connection strength is increased is obtained. It is done.
- the wiring member 4 is preferably in the form of a film, that is, its cross section is rectangular. As a result, the distance to the surface electrode 3 can be easily controlled, so that the dimensional accuracy during knocking is improved.
- the wiring member 4 is not particularly limited as long as it contains a metal as a main component.
- the metal that is the material of the wiring member 4 include gold, silver, copper, iron, stainless steel, 42 alloy, and soldered copper.
- the wiring member 4 more preferably includes one or more metals selected from the group consisting of Cu, Ag, Au, Fe, Ni, Pb, Zn, Co, Ti, and Mg. preferable.
- the wiring member 4 is a metal plating layer or a metal electrodeposition layer provided on the surface of an insulating film (not shown). preferable. However, depending on the application, it is a metal foil.
- the material of the insulating film is not particularly limited as long as it exhibits insulating properties. However, from the viewpoint of further improving the flexibility and increasing the dimensional accuracy, it is preferable that the material of the insulating film is mainly composed of resin. preferable.
- the resin include polyimide resin, glass epoxy resin, bismaleimide triazine resin, and polyester resin.
- connection method consists of the following first step, second step, third step and fourth step. It is what you have.
- a first laminate is prepared by forming the surface electrode 3 on a substrate such as a silicon wafer.
- a conductive adhesive film 10 is formed on the surface of the wiring member 4 formed on the insulating film to obtain a second laminate.
- the conductive adhesive film 10 is a paste-like adhesive component in which conductive particles 1 are dispersed (hereinafter, a combination of conductive particles and a paste-like adhesive component is also referred to as a “paste-like conductive adhesive”. .) May be obtained through a process of volatilizing the solvent and the like to form a film after coating on the surface of the wiring member 2.
- the conductive adhesive film 10 may be obtained through a process of being placed on the surface of the wiring member 4 after previously forming a film by volatilizing a solvent or the like from the paste-like conductive adhesive. .
- the latter may be the latter from the viewpoint of film thickness dimensional accuracy of the conductive adhesive film 10 and Z or pressure distribution when the conductive adhesive film 10 is pressure-bonded in the fourth step described later. preferable. In this case, it is preferable to place the conductive adhesive film 10 on the surface of the wiring member 4 and then press-bond them in the laminating direction to temporarily press-bond them.
- the paste-like adhesive component is obtained from the composition containing the thermosetting resin and other optional components described above, and is used as it is when it is liquid at room temperature (25 ° C). can do.
- the composition When the composition is solid at room temperature, it may be pasted by using a solvent in addition to heating to form a paste.
- the solvent that can be used is not particularly limited as long as it does not react with the above-described composition and exhibits sufficient solubility.
- the pasty conductive adhesive is formed into a film in advance
- the pasty conductive adhesive is applied onto a peelable substrate such as a fluorine resin film, a polyethylene terephthalate film, or a release paper.
- a peelable substrate such as a fluorine resin film, a polyethylene terephthalate film, or a release paper.
- it can be obtained by impregnating a base material such as a non-woven fabric with the above-mentioned adhesive and placing it on a peelable base material and removing the solvent or the like.
- the paste-like conductive adhesive is formed into a film in advance in this way, it is excellent in handleability and more convenient. Further, in this case, the exfoliated substrate is peeled and removed immediately before or after the conductive adhesive film 10 is placed on the surface of the wiring member 4.
- the paste-like conductive adhesive is applied using an applicator, roll coater, comma coater, knife coater, doctor blade flow coater, sealing coater, die coater, lip coater, or the like. Clothed. At this time, the film thickness t of the conductive adhesive film 10 can be controlled by adjusting the gap of the applicator or lip coater. The film thickness t of the conductive adhesive film 10 is
- thermosetting resin contained in the paste-like conductive adhesive.
- the first laminate and the second laminate are brought into contact with the surface Se of the surface electrode 3 in the first laminate and the surface of the conductive adhesive film 10 in the second laminate.
- a third laminated body obtained by further laminating is obtained.
- pressure may be applied in the laminating direction to temporarily press-bond.
- the third laminate is heated and pressed in the laminating direction to obtain a connection structure 200 in which at least the surface electrode 3, the conductive adhesive film 10, and the wiring member 4 are laminated in this order.
- the surface electrode 3 and the wiring member 4 are bonded together by the conductive adhesive film 10, and electrical connection between them is ensured via the conductive adhesive film 10.
- the conditions of the heating temperature and the pressurizing pressure are not particularly limited as long as the electrical connection can be ensured and the surface electrode 3 and the wiring member 4 are bonded to each other by the conductive adhesive film 10.
- the various conditions for pressurization and heating are appropriately selected according to the intended use, each component in the adhesive component, and the material of the connection structure 200.
- the heating temperature may be a temperature at which the thermosetting resin is cured.
- the pressurizing pressure may be within a range where the surface electrode 3 and the conductive adhesive film 10 are sufficiently adhered and the surface electrode 3 and the wiring member 4 are not damaged.
- the heating and pressurizing time may be a time that does not cause excessive heat to be transferred to the surface electrode 3, the wiring member 4, etc., and damage or change the quality of those materials.
- the ultimate temperature force of the conductive adhesive film 10 Under the pressurized condition of lMPa to 3MPa, the conditional force to reach 150 ° C to 180 ° C for 15 seconds to 20 seconds Electrical connection and adhesive force It is also preferable to improve the viewpoint.
- connection structure 200 obtained in this way, the conductive particles 1 dispersed in the conductive adhesive film 10 ensure sufficient electrical connection between the surface electrode 3 and the wiring member 4. Further, the conductive adhesive film 10 bonds the surface electrode 3 and the wiring member 4 with sufficient adhesive strength. As a result, the connection structure 200 is sufficiently excellent in connection reliability. Also electrical connection No need to use solder to ensure! Therefore, the deterioration of the characteristics of the connection structure 200 is sufficiently suppressed, and the product yield reduction due to packaging can be prevented.
- the conductive adhesive film 10 of the present embodiment can be most suitably used for solar cells.
- a solar cell has a plurality of solar cells connected in series and Z or in parallel, sandwiched with tempered glass for environmental resistance, and provided with external terminals filled with transparent grease. Used as a solar cell module.
- the conductive adhesive film 10 of the present embodiment is suitably used for the purpose of connecting a wiring member for connecting a plurality of solar cells in series and Z or in parallel to the surface electrode of the solar cell.
- the solar cell module of the present embodiment has a structure in which a plurality of solar cells having a surface electrode are connected via a wiring member electrically connected to the surface electrode as described above.
- the surface electrode and the wiring member are connected by the conductive adhesive film of this embodiment.
- FIG. 3 is a schematic diagram showing a main part of the solar cell module of the present embodiment, and shows an outline of a structure in which a plurality of solar cells are connected to each other by wiring.
- Fig. 3 (a) shows the front side of the solar cell module
- Fig. 3 (b) shows the back side
- Fig. 3 (c) shows the side.
- the solar cell module 100 includes a grid electrode 7 and a bus electrode (surface electrode) 3a on the front surface side of the semiconductor wafer 6, and a back electrode 8 and A plurality of solar cells each formed with a bus electrode (surface electrode) 3 b are connected to each other by a wiring member 4.
- the wiring member 4 has one end connected to the nose electrode 3a as the surface electrode and the other end connected to the bus electrode 3b as the surface electrode via the conductive adhesive film 10 of the present invention.
- the solar cell module 100 having a powerful configuration, the surface electrode and the wiring member are connected by the above-described conductive adhesive film of the present embodiment, so that there is no adverse effect on the solar cell, and Sufficient connection reliability can be obtained. As a result, the solar cell module 100 can secure a high FF for a long time due to its excellent connection reliability.
- the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.
- connection method of the present invention is not limited to the manufacturing of the above-described solar cell.
- a tantalum capacitor, an aluminum electrolytic capacitor, a ceramic capacitor, a power transistor, various sensors, a MEMS-related material, and a lead-out wiring member for a display material Etc. can also be suitably used when producing the like.
- a solar cell in which a surface electrode (width 2 mm x length 15 cm, Rz: 10 m, Ry: 14 m) formed from a silver glass paste is provided on the surface of a polycrystalline silicon wafer.
- an acrylic rubber obtained by copolymerizing 40 parts by mass of butyl acrylate, 30 parts by mass of ethyl acrylate, 30 parts by mass of acrylonitrile, and 3 parts by mass of glycidyl methacrylate.
- the product name “KS8200H”, molecular weight: 850,000) was prepared.
- phenoxy resin (trade name “PKHC”, manufactured by Union Carbide Corporation, weight average molecular weight: 45 000) and 125 g of the above acrylic rubber were dissolved in 400 g of ethyl acetate to obtain a solution having a solid content of 30% by mass. It was.
- 325 g of liquid epoxy resin containing a microcapsule-type latent curing agent (trade name “Novaquia HX-3941HP” manufactured by Asahi Kasei Chemicals Co., Ltd., epoxy equivalent: 185 g / eq) is added to the above solution, and further the solution was stirred to obtain a paste-like adhesive component.
- nickel particles (apparent density: 3.36 gZcm 3 ), which are conductive particles having an average particle diameter of 12 m, were added to the adhesive component described above and dispersed.
- a paste-like conductive adhesive containing 5% by volume of conductive particles based on the total volume of the adhesive component and conductive particles was obtained.
- the average particle size of the conductive particles is measured with a scanning electron microscope (SEM It was derived by the above-mentioned method through observation under the product name “S-510” manufactured by Hitachi, Ltd.
- the compounding amount of the conductive particles was calculated by calculating the particle volume calculated by regarding the shape of the conductive particles as a sphere having an average particle diameter of the diameter, and the apparent density force of the conductive particles.
- the paste-like conductive adhesive is electrolyzed with a roll coater (trade name “PI-1210” manufactured by Tester Sangyo Co., Ltd.) having a width of 20 cm, a length of 30 cm, and a thickness of 175 m.
- a coating film was obtained by applying to the glossy surface of the copper foil.
- the gap of the roll coater was adjusted so that the thickness after the solvent was volatilized from the coating film, that is, the thickness of the conductive adhesive film was 25 m. In this adjustment, the gap is changed in advance to produce three types of films with different film thicknesses after removal of the solvent, etc., and a relational expression between the gap and the film thickness is derived and based on the relational expression. Went
- the coating film was placed on a hot plate and heated at 70 ° C. for 3 minutes to volatilize the solvent and the like. After that, it is cut into 2mm width by slitter (trade name “High-precision gang unit” manufactured by Toyo Knife Co., Ltd.) to disperse the conductive particles and form a conductive adhesive film with a thickness of 25 m on the glossy surface of electrolytic copper foil A laminate provided above was obtained. This laminate was cut to a length of 20 cm to form a rectangle 2 mm wide x 20 cm long.
- a laminate was obtained by laminating them so that the surface of the conductive adhesive film opposite to the electrolytic copper foil side was in contact with the surface of the surface electrode of the solar cell. .
- the heating temperature is 170 ° C
- the pressing pressure is 2 MPa
- the heating and pressing time is applied to the laminate. Under the condition of 20 seconds, heating and pressurization were performed in the laminating direction.
- a connection structure in which a wiring member made of electrolytic copper foil was connected to the surface electrode of the solar battery cell via the conductive adhesive film was obtained.
- Example 2 instead of the electrolytic copper foil, the same procedure as in Example 1 was used, except that a copper plating film (copper plating thickness: 40 m) with copper plating on the main surface of the resin film as an insulating film was used. Thus, a connection structure was obtained.
- a copper plating film copper plating thickness: 40 m
- Gold-plated plastic particles (mean particle diameter: 20 m, gold-plated thickness: average 200 A, apparent density: 2. 8 g / cm 3 ), Rz: 15 m, Ry: Rm: 15 m, Ry: instead of a solar cell provided with a surface electrode formed from a silver glass paste having a surface roughness of 14 m : Solar cell with a surface electrode made of silver glass paste with a surface roughness of 18 ⁇ m (MOTECH, trade name “125 square cell polycrystal MOT Tl”, thickness: 250 / zm A connection structure was obtained in the same manner as in Example 1 except that X width 12.5 cm X length 12.5 cm) was used.
- Example 2 the same solar cell as in Example 1 was prepared. Next, a soldered copper wire (width 2 mm x thickness 250 ⁇ m) was prepared, and the solar cell electrode and the soldered copper wire were soldered. A connection structure was thus obtained.
- connection structure was obtained in the same manner as in Example 1 except that the average particle diameter of the conductive particles was changed as shown in Table 4.
- connection structure was obtained in the same manner as in Example 1 except that the thickness of the conductive adhesive film was changed as shown in Table 6.
- each substance in the adhesive component according to each Example and Comparative Example is shown in Tables 1 and 2, and the types of conductive particles and wiring members are shown in Tables 3 and 4, and the surface roughness of the surface electrode and Tables 5 and 6 show the types of conductive adhesive films.
- the thickness of the conductive adhesive film and the surface roughness of the surface electrode were measured as follows.
- the elastic modulus (storage elastic modulus) of the conductive adhesive film was measured as described above.
- the thickness of the conductive adhesive film was measured with a micrometer (trade name “ID-C112C” manufactured by Mitutoyo Corp.).
- the 10-point average roughness Rz and the maximum height Ry of the surface electrode were calculated based on JIS-B0604-1994.
- the surface of the electrode was observed with an ultra-deep shape measuring microscope (manufactured by KEYENCE, product name “VK-8510”), and image measurement analysis software (manufactured by KEYENCE, product name) Rz and Ry were derived from “VK-H1A7”.
- the end portion of the tab electrode (electrolytic copper foil or copper plated film) in the obtained connection structure was bent vertically and fixed to a chuck of a peel strength measuring device (trade name “STA-1150” manufactured by ORIENTEC). Thereafter, the tab electrode was pulled up at a pulling speed of 2 cmZ seconds, and the peel strength was measured.
- peel cracking means that the peel strength is high, and the wafer cracked before the tab electrode was completely peeled (peeled), and the peel strength could not be measured.
- connection structure was placed on a smooth surface with the wafer facing down, and one end (one side) of the rectangular wafer was fixed to the smooth surface. Since the wafer has a convex surface on the side opposite to the electrode side, when one end of a rectangular wafer was fixed to a smooth surface, one end facing it was raised. The distance with the smooth surface force at one end of the surface was measured at five points using a depth of focus meter, and the arithmetic mean value was calculated. The above addition to the length of one side of the wafer The ratio (%) of the average value was derived as the amount of warpage. The lower limit of the measurement limit is 0.3%, so when it is smaller than that, it is indicated as “ku 0.3” in the table.
- the IV curve of the obtained connection structure was converted to a solar simulator (made by Samurai Kodenso Co., Ltd.
- connection structure was allowed to stand for 1000 hours in a high-temperature, high-humidity atmosphere at 85 ° C and 85% RH, and the IV curve was measured in the same manner.
- Each IV curve force also derives F. F, and is the value obtained by dividing F. F after standing in a high-temperature, high-humidity atmosphere by FF before standing in high-temperature, high-humidity conditions. ) / FF (Oh) was used as an evaluation index. Generally, when the value of F. F. (1000h) / F. F. (Oh) is 0.95 or less, it is judged that the connection reliability is low.
- connection structures were fabricated. The state of each connection structure was observed, and the number of 10 pieces excluding those in which cracking or peeling was observed was evaluated as the yield (%).
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Description
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Priority Applications (5)
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CA 2666404 CA2666404A1 (en) | 2006-10-10 | 2007-04-27 | Connected structure and method for manufacture thereof |
CN2007800377699A CN101529603B (zh) | 2006-10-10 | 2007-04-27 | 连接结构及其制造方法 |
US12/445,227 US9123835B2 (en) | 2006-10-10 | 2007-04-27 | Connected structure and method for manufacture thereof |
EP07742645A EP2086023A4 (en) | 2006-10-10 | 2007-04-27 | CONNECTED STRUCTURE AND METHOD OF MANUFACTURING |
US14/813,644 US20160035925A1 (en) | 2006-10-10 | 2015-07-30 | Connected structure and method for manufacture thereof |
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JP2006276785A JP5323310B2 (ja) | 2005-11-10 | 2006-10-10 | 接続構造及びその製造方法 |
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US12/445,227 A-371-Of-International US9123835B2 (en) | 2006-10-10 | 2007-04-27 | Connected structure and method for manufacture thereof |
US14/813,644 Division US20160035925A1 (en) | 2006-10-10 | 2015-07-30 | Connected structure and method for manufacture thereof |
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US (2) | US9123835B2 (ja) |
EP (1) | EP2086023A4 (ja) |
KR (1) | KR101081163B1 (ja) |
CN (2) | CN101997059B (ja) |
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- 2007-04-27 US US12/445,227 patent/US9123835B2/en active Active
- 2007-04-27 CN CN2010102920077A patent/CN101997059B/zh active Active
- 2007-04-27 WO PCT/JP2007/059210 patent/WO2008044357A1/ja active Application Filing
- 2007-04-27 CA CA 2666404 patent/CA2666404A1/en not_active Abandoned
- 2007-04-27 CN CN2007800377699A patent/CN101529603B/zh active Active
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2015
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2011001837A1 (ja) * | 2009-07-02 | 2011-01-06 | シャープ株式会社 | 配線シート付き太陽電池セル、太陽電池モジュールおよび配線シート付き太陽電池セルの製造方法 |
JPWO2011001837A1 (ja) * | 2009-07-02 | 2012-12-13 | シャープ株式会社 | 配線シート付き太陽電池セル、太陽電池モジュールおよび配線シート付き太陽電池セルの製造方法 |
US20120240985A1 (en) * | 2009-08-27 | 2012-09-27 | Sanyo Electric Co., Ltd. | Solar cell string and solar cell module using same |
WO2011099452A1 (ja) * | 2010-02-15 | 2011-08-18 | ソニーケミカル&インフォメーションデバイス株式会社 | 薄膜型太陽電池モジュールの製造方法 |
WO2011152372A1 (ja) * | 2010-05-31 | 2011-12-08 | 三洋電機株式会社 | 太陽電池モジュール及びその製造方法 |
JP6073681B2 (ja) * | 2010-10-21 | 2017-02-01 | コニカミノルタ株式会社 | 有機エレクトロルミネッセンス素子 |
JP2012119441A (ja) * | 2010-11-30 | 2012-06-21 | Sony Chemical & Information Device Corp | 太陽電池モジュール及びその製造方法 |
WO2013094052A1 (ja) * | 2011-12-22 | 2013-06-27 | 三洋電機株式会社 | 太陽電池及び太陽電池モジュール |
JPWO2013094052A1 (ja) * | 2011-12-22 | 2015-04-27 | 三洋電機株式会社 | 太陽電池及び太陽電池モジュール |
CN113557274A (zh) * | 2019-03-13 | 2021-10-26 | 昭和电工材料株式会社 | 电路连接用黏合剂膜及其制造方法、电路连接结构体的制造方法以及黏合剂膜收纳套组 |
CN113557274B (zh) * | 2019-03-13 | 2023-08-01 | 株式会社力森诺科 | 电路连接用黏合剂膜及其制造方法、电路连接结构体的制造方法以及黏合剂膜收纳套组 |
Also Published As
Publication number | Publication date |
---|---|
US9123835B2 (en) | 2015-09-01 |
CN101529603B (zh) | 2010-12-29 |
CN101529603A (zh) | 2009-09-09 |
CA2666404A1 (en) | 2008-04-17 |
US20100147355A1 (en) | 2010-06-17 |
EP2086023A4 (en) | 2012-05-09 |
EP2086023A1 (en) | 2009-08-05 |
CN101997059B (zh) | 2012-09-26 |
KR20090073218A (ko) | 2009-07-02 |
CN101997059A (zh) | 2011-03-30 |
KR101081163B1 (ko) | 2011-11-07 |
US20160035925A1 (en) | 2016-02-04 |
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