WO2012147378A1 - Procédé de formation d'électrode collectrice de pile solaire, ensemble de compositions conductrices pour formation d'électrode collectrice de pile solaire, et pile solaire - Google Patents

Procédé de formation d'électrode collectrice de pile solaire, ensemble de compositions conductrices pour formation d'électrode collectrice de pile solaire, et pile solaire Download PDF

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WO2012147378A1
WO2012147378A1 PCT/JP2012/051235 JP2012051235W WO2012147378A1 WO 2012147378 A1 WO2012147378 A1 WO 2012147378A1 JP 2012051235 W JP2012051235 W JP 2012051235W WO 2012147378 A1 WO2012147378 A1 WO 2012147378A1
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electrode
solar cell
forming
bus bar
conductive
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PCT/JP2012/051235
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English (en)
Japanese (ja)
Inventor
奈央 佐藤
石川　和憲
一雄 荒川
愛美 金
浩一 上迫
マルワン ダムリン
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横浜ゴム株式会社
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Priority to CN201280003092.8A priority Critical patent/CN103140932B/zh
Priority to DE112012001862.1T priority patent/DE112012001862T5/de
Publication of WO2012147378A1 publication Critical patent/WO2012147378A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • 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
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for forming a solar cell collecting electrode, a conductive composition for forming a solar cell collecting electrode, and a solar cell having an electrode formed using these.
  • Solar cells that convert light energy such as sunlight into electrical energy have been actively developed in various structures and configurations as interest in global environmental issues increases.
  • solar cells using a semiconductor substrate such as silicon are most commonly used due to advantages such as conversion efficiency and manufacturing cost.
  • Patent Document 1 discloses that “an organic binder, a solvent, conductive particles, glass frit, a metal oxide, and a temperature of 150 to 800 ° C.
  • Patent Document 2 discloses that “a zinc oxide particle having a specific surface area of 6 m 2 / g or less, which is an electrode paste for a solar cell containing conductive particles, a lead-free glass frit, a resin binder, and zinc oxide particles.
  • the electrode paste for solar cells is contained in an amount of 10% by weight or more based on the total amount of zinc oxide ”([Claim 1]), and it is described that zinc oxide is known as an additive for the electrode paste. ([0005]).
  • Patent Document 3 the present applicant states that “silver powder (A), silver oxide (B), and organic solvent (D) are contained, and the silver powder (A) is contained in the composition.
  • a conductive composition that is 50% by mass or more in a simple substance and a silver compound ” has been proposed ([Claim 1]), and includes an embodiment containing silver carboxylate as an optional component, glass frit, metal additives, and the like. (2) [0030] [0033] [0034] and the like.
  • the present inventor examined the pastes and conductive compositions described in Patent Documents 1 to 3, and found that the solar cell fill factor (FF) obtained by the effect of addition of metal oxide (zinc oxide) and Although the photoelectric conversion efficiency (Eff) is improved, depending on the addition amount of the metal oxide, the solder adhesion to the bus bar electrode (bus electrode) formed in the solar battery cell is inferior, and the interconnector in which the metal ribbon is coated with solder is used. It became clear that it was difficult to modularize the solar battery cells.
  • FF solar cell fill factor
  • Eff photoelectric conversion efficiency
  • the present invention provides a method for forming a solar cell current collecting electrode and a conductive composition for forming a solar cell current collecting electrode that can form an electrode having excellent solder adhesion, and is produced using these. It is an object of the present invention to provide a solar cell excellent in fill factor (FF) and photoelectric conversion efficiency (Eff).
  • FF fill factor
  • Eff photoelectric conversion efficiency
  • the present inventor has formed solder adhesion by forming each of the finger electrode and the bus bar electrode using two kinds of conductive compositions having different metal oxide contents. It was found that an excellent electrode can be formed, and a solar cell excellent in fill factor (FF) and photoelectric conversion efficiency (Eff) can be produced, and the present invention has been completed. That is, the present invention provides the following (1) to (4).
  • An electrode forming method comprising: A finger electrode forming step of forming a finger electrode using a conductive composition for forming a finger electrode containing 3 to 10 parts by mass of a metal oxide (D) with respect to 100 parts by mass of the conductive particles (A); After the finger electrode forming step, a bus bar electrode is formed by using a bus bar electrode forming conductive composition containing less than 3 parts by mass of the metal oxide (D) with respect to 100 parts by mass of the conductive particles (A). And a bus bar electrode forming step.
  • a set of conductive compositions for forming a solar cell collecting electrode comprising at least conductive particles (A), glass frit (B) and solvent (C), A conductive composition for forming a finger electrode containing 3 to 10 parts by mass of a metal oxide (D) with respect to 100 parts by mass of the conductive particles (A); A conductive composition for forming a solar cell collector electrode, comprising: a conductive composition for forming a bus bar electrode containing less than 3 parts by mass of a metal oxide (D) with respect to 100 parts by mass of the conductive particles (A). set.
  • a solar cell module in which the solar cells described in (3) above are joined in series using an interconnector whose surface is coated with solder.
  • a method of forming a solar cell collector electrode and a conductive composition for forming a solar cell collector electrode capable of forming an electrode excellent in solder adhesion, and these The solar cell excellent in the fill factor (FF) and photoelectric conversion efficiency (Eff) produced using can be provided.
  • FIG. 1 is a schematic cross-sectional view of a solar battery cell.
  • FIG. 2 is a schematic top view as seen from the surface electrode side of the solar battery cell and a schematic bottom view as seen from the back electrode side.
  • FIG. 3 is a schematic perspective view of the solar cell module and an enlarged cross-sectional view of the joint.
  • the set of the conductive composition for forming a solar cell collecting electrode of the present invention includes at least conductive particles (A), glass frit (B) and solvent (C And a finger electrode containing 3 to 10 parts by mass of the metal oxide (D) with respect to 100 parts by mass of the conductive particles (A).
  • a bus bar electrode containing less than 3 parts by mass of the metal oxide (D) with respect to 100 parts by mass of the conductive composition for formation (hereinafter also referred to as “finger electrode composition”) and the conductive particles (A).
  • a conductive composition for forming a solar cell current collecting electrode having a conductive composition for formation (hereinafter, also referred to as “bus bar electrode composition”).
  • Good other components will be described in detail. In addition, it explains in full detail as a component of the set composition of this invention about the component which is common in the said composition for finger electrodes, and the said composition for bus bar electrodes.
  • the conductive particles (A) used in the set composition of the present invention are not particularly limited.
  • a metal material having an electrical resistivity of 20 ⁇ 10 ⁇ 6 ⁇ ⁇ cm or less can be used.
  • Specific examples of the metal material include gold (Au), silver (Ag), copper (Cu), aluminum (Al), magnesium (Mg), nickel (Ni), and the like.
  • One species may be used alone, or two or more species may be used in combination.
  • gold, silver, and copper are used because an electrode having a small volume resistivity can be formed and a solar cell having a better fill factor (FF) and photoelectric conversion efficiency (Eff) can be produced. Is preferred, and silver is more preferred.
  • FF fill factor
  • Eff photoelectric conversion efficiency
  • an average particle diameter means the average value of the particle diameter of a metal powder, and means the 50% volume cumulative diameter (D50) measured using the laser diffraction type particle size distribution measuring apparatus.
  • the particle diameter used as the basis for calculating the average value is an average value obtained by dividing the total value of the major axis and the minor axis by 2, and in the case of a perfect circle, Refers to the diameter.
  • the spherical shape refers to the shape of particles having a major axis / minor axis ratio of 2 or less.
  • the average particle diameter of the conductive particles (A) is preferably 0.7 to 5 ⁇ m because the printability is better, and the sintering speed is appropriate and the workability is improved.
  • the thickness is more preferably 1 to 3 ⁇ m.
  • a commercially available product can be used as the conductive particles (A).
  • Specific examples thereof include AgC-102 (shape: spherical, average particle size: 1.5 ⁇ m, Fukuda Metal Foil Powder Industry).
  • AGC-103 shape: spherical, average particle size: 1.5 ⁇ m, manufactured by Fukuda Metal Foil Powder Co., Ltd.
  • AG4-8F shape: spherical, average particle size: 2.2 ⁇ m, manufactured by DOWA Electronics
  • AG2-1C shape: spherical, average particle size: 1.0 ⁇ m, manufactured by DOWA Electronics
  • AG3-11F shape: spherical, average particle size: 1.4 ⁇ m, manufactured by DOWA Electronics
  • SPN5J shape: spherical
  • EHD shape: spherical, average particle size
  • the glass frit (B) used in the set composition of the present invention is not particularly limited, and it is preferable to use one having a softening temperature of 300 ° C. or higher and a firing temperature (heat treatment temperature) or lower.
  • Specific examples of the glass frit (B) include borosilicate glass frit having a softening temperature of 300 to 800 ° C.
  • the shape of the glass frit (B) is not particularly limited, and may be spherical or crushed powder.
  • the average particle diameter (D50) of the spherical glass frit is preferably 0.1 to 20 ⁇ m, and more preferably 1 to 10 ⁇ m.
  • the content of the glass frit (B) is preferably 0.1 to 10 parts by mass, and more preferably 1 to 5 parts by mass with respect to 100 parts by mass of the conductive particles (A).
  • the solvent (C) used in the set composition of the present invention is not particularly limited as long as it can apply the finger electrode composition and the bus bar electrode composition onto a substrate.
  • Specific examples of the solvent (C) include butyl carbitol, butyl carbitol acetate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, diethylene glycol dibutyl ether, methyl ethyl ketone, isophorone, Examples thereof include ⁇ -terpineol, and these may be used alone or in combination of two or more.
  • the content of the solvent (C) is preferably 2 to 20 parts by weight, more preferably 5 to 15 parts by weight with respect to 100 parts by weight of the conductive particles (A).
  • the metal oxide (D) used in the set composition of the present invention is not particularly limited as long as it is an oxide formed by bonding oxygen atoms and metal elements directly or indirectly.
  • Specific examples of the metal oxide (D) include, for example, zinc oxide, titanium oxide, silicon oxide, cerium oxide, bismuth oxide, tin oxide, and ABO 3 (wherein A consists of Ba, Ca, and Sr). Represents at least one element selected from the group, and B represents at least one element selected from the group consisting of Ti, Zr and Hf and represents Ti). These may be used alone or in combination of two or more.
  • the average particle diameter of the metal oxide (D) can form an electrode with a small volume resistivity, and has a better fill factor (FF) and photoelectric conversion efficiency (Eff). Is preferably 10 ⁇ m or less.
  • the average particle diameter means an average value of the particle diameter of the metal oxide, and all the metals existing at a viewing angle of 1 mm 2 using a scanning electron microscope (SEM) or a transmission electron microscope (TEM).
  • SEM scanning electron microscope
  • TEM transmission electron microscope
  • the particle diameter of the oxide can be measured and calculated from the average value. Moreover, it can also calculate using the specific surface area calculated
  • an electrode having a smaller volume resistivity can be formed with an average particle diameter of the metal oxide (D), and a solar cell having a better fill factor (FF) and photoelectric conversion efficiency (Eff) is produced.
  • D metal oxide
  • FF fill factor
  • Eff photoelectric conversion efficiency
  • it is preferably 10 nm or more and less than 100 nm, more preferably 30 to 50 nm, except for zinc oxide having aluminum or gallium described later.
  • the said metal oxide (D) can form an electrode with small volume resistivity, and produces a photovoltaic cell with a better fill factor (FF) and photoelectric conversion efficiency (Eff).
  • FF fill factor
  • Eff photoelectric conversion efficiency
  • it is preferably conductive zinc oxide (hereinafter, referred to as “conductive zinc oxide”) partially containing aluminum or gallium (hereinafter, abbreviated as “aluminum or the like” in this paragraph).
  • conductive zinc oxide partially containing aluminum or gallium
  • having aluminum or the like partially means a state in which zinc oxide is doped with aluminum or the like, and can be formed by mixing an oxide such as aluminum with zinc oxide and baking.
  • the average particle diameter of the said conductive zinc oxide can form an electrode with smaller volume resistivity, and can produce a photovoltaic cell with still more favorable fill factor (FF) and photoelectric conversion efficiency (Eff) Therefore, the thickness is preferably 0.02 to 10 ⁇ m, and more preferably 0.02 to 3.5 ⁇ m.
  • the said metal oxide (D) can form an electrode with small volume resistivity, and produces a photovoltaic cell with a better fill factor (FF) and photoelectric conversion efficiency (Eff).
  • the perovskite is preferable for the reason that it can be used.
  • Specific examples of the perovskite include perovskites represented by BaTiO 3 , SrTiO 3 , CaTiO 3 and BrZrO 3 , and among them, SrTiO 3 is more preferable.
  • the content of the metal oxide (D) in the finger electrode composition is 3 to 10 parts by mass with respect to 100 parts by mass of the conductive particles (A).
  • the content of the metal oxide (D) in the bus bar electrode composition is less than 3 parts by mass with respect to 100 parts by mass of the conductive particles (A).
  • the metal oxide (D) is an optional component.
  • the metal oxide (D) contributes to a reduction in volume resistivity while adversely affecting the solder adhesion. That is, when a solar battery cell is modularized, a bus bar electrode that comes into contact with an interconnector coated with solder is formed by using the bus bar electrode composition having a low content of the metal oxide (D), so that the solder adhesion is achieved. It is considered that the low volume resistivity could be secured by forming the finger electrode using the finger electrode composition having a high content of the metal oxide (D).
  • the content of the metal oxide (D) in the finger electrode composition is because a solar cell having a better fill factor (FF) and photoelectric conversion efficiency (Eff) can be produced.
  • the amount is preferably 5 to 10 parts by mass, more preferably 5 to 8 parts by mass with respect to 100 parts by mass of the conductive particles (A).
  • the content of the metal oxide (D) in the bus bar electrode composition is such that the conductive particles (A) 100 can be formed because an electrode (bus bar electrode) superior in solder adhesion can be formed.
  • the amount is preferably 0 to 2 parts by mass, more preferably 0 to 1 part by mass with respect to parts by mass.
  • the set composition of the present invention can form an electrode with a small volume resistivity, and can produce a solar cell with a better fill factor (FF) and photoelectric conversion efficiency (Eff). It is preferable that the composition contains a fatty acid silver salt (E).
  • the fatty acid silver salt (E) is not particularly limited as long as it is a silver salt of an organic carboxylic acid (fatty acid), and is described, for example, in paragraphs [0063] to [0068] of JP-A-2008-198595.
  • JP 2010-92684 A Fatty acid silver salts having one or more hydroxyl groups, secondary fatty acid silver salts described in paragraphs [0046] to [0056] of the same publication, and [0022] to [0026] of JP 2011-35062 A
  • a silver carboxylate or the like can be used.
  • carbon has excellent printability, can form an electrode with a smaller volume resistivity, and can produce a solar cell with a better fill factor (FF) and photoelectric conversion efficiency (Eff).
  • a polycarboxylic acid silver salt (E3) having 3 or more carboxy silver bases (—COOAg) without having a hydroxyl group (—OH) is used because an electrode having a smaller volume resistivity can be formed. Is particularly preferred.
  • examples of the fatty acid silver salt (E2) include compounds represented by any one of the following formulas (I) to (III).
  • n represents an integer of 0 to 2
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
  • R 2 represents an alkylene group having 1 to 6 carbon atoms.
  • the plurality of R 2 may be the same or different
  • the plurality of R 1 may be the same or different.
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
  • a plurality of R 1 may be the same or different.
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
  • R 3 represents an alkylene group having 1 to 6 carbon atoms.
  • the plurality of R 1 may be the same or different.
  • Examples of the polycarboxylic acid silver salt (E3) include a compound represented by the following formula (IV).
  • m represents an integer of 2 to 6
  • R 4 represents an m-valent saturated aliphatic hydrocarbon group having 1 to 24 carbon atoms
  • an m-valent unsaturated fat having 2 to 12 carbon atoms.
  • fatty acid silver salt (E1) examples include 2-methylpropanoic acid silver salt (also known as isobutyric acid silver salt) and 2-methylbutanoic acid silver salt.
  • fatty acid silver salt (E2) examples include 2-hydroxyisobutyric acid silver salt and 2,2-bis (hydroxymethyl) -n-butyric acid silver salt.
  • polycarboxylic acid silver salt (E3) examples include 1,3,5-pentanetricarboxylic acid silver salt and 1,2,3,4-butanetetracarboxylic acid silver salt. Is done.
  • the content when the fatty acid silver salt (E) is contained, the content is 0.1 to 10 with respect to 100 parts by mass of the conductive particles (A) because the printing property is better.
  • the amount is preferably part by mass, more preferably 1 to 10 parts by mass.
  • the set composition of this invention may contain the resin binder as needed from a printable viewpoint.
  • the resin binder is obtained by dissolving a resin having a binder function in a solvent.
  • Specific examples of the resin include ethyl cellulose resin, nitrocellulose resin, alkyd resin, acrylic resin, styrene resin, phenol resin and the like, and these may be used alone or in combination of two or more. May be. Among these, it is preferable to use ethyl cellulose resin from the viewpoint of thermal decomposability.
  • the solvent examples include ⁇ -terpineol, butyl carbitol, butyl carbitol acetate, diacetone alcohol, methyl isobutyl ketone, and the like. You may use the above together.
  • the solvent may be a part of the solvent (C) described above.
  • the set composition of this invention may contain additives, such as a reducing agent, as needed.
  • a reducing agent include ethylene glycols.
  • the content of silver oxide is preferably 5 parts by mass or less with respect to 100 parts by mass of the solvent (C) described above, because the thixotropy becomes better and the aspect ratio can be further increased. It is more preferable that the amount is less than or equal to parts, and an embodiment that does not substantially contain silver oxide is most preferable.
  • the method for producing the set composition of the present invention that is, the method for preparing the finger electrode composition and the bus bar electrode composition is not particularly limited, and the conductive particles (A), the glass frit (B), The solvent (C), the metal oxide (D), and the fatty acid silver salt (E) which may be optionally contained, the resin binder and additives are mixed by a roll, a kneader, an extruder, a universal agitator, etc. The method of doing is mentioned.
  • the solar cell collector electrode forming method of the present invention is a solar cell collector electrode forming method for forming a solar cell collector electrode, wherein the composition for finger electrodes is described above.
  • a solar cell current collecting electrode comprising: a finger electrode forming step for forming a finger electrode using an object; and a bus bar electrode forming step for forming a bus bar electrode using the bus bar electrode composition after the finger electrode forming step. It is a forming method. Below, a finger electrode formation process and a bus-bar electrode formation process are explained in full detail.
  • the finger electrode formation process which the electrode formation method of this invention has is a process of forming a finger electrode using the said composition for finger electrodes.
  • a finger electrode forming step for example, a wiring forming step of forming the wiring (finger electrode precursor) by applying the composition for finger electrodes on a silicon substrate (an antireflection film when an antireflection film is provided). And a method including a heat treatment step of forming a finger electrode by heat-treating (firing) the obtained wiring.
  • the antireflection film can be formed by a known method such as a plasma CVD method.
  • the wiring is fired through the antireflection film during the heat treatment in the heat treatment step so that the electrode contacts the silicon substrate. Can be formed.
  • a wiring formation process and a heat treatment process are explained in full detail.
  • the said wiring formation process is a process of apply
  • specific examples of the coating method include inkjet, screen printing, gravure printing, offset printing, letterpress printing, and the like.
  • the finger electrode composition is applied.
  • the object may be applied not only to the part that forms the finger electrode, but also to the part that forms the bus bar electrode.
  • the heat treatment step is a step of obtaining finger electrodes by heat-treating the wiring obtained in the wiring formation step.
  • the heat treatment is not particularly limited, but it is preferably a heat treatment (baking) at a temperature of 150 to 860 ° C. for several seconds to several tens of minutes.
  • the temperature and time are within this range, even when an antireflection film is formed on the silicon substrate, the electrode can be easily formed by the fire-through method.
  • the heat treatment step may be performed by irradiation with ultraviolet rays or infrared rays.
  • the bus bar electrode forming step of the electrode forming method of the present invention is a step of forming a bus bar electrode using the bus bar electrode composition.
  • a method including a heat treatment step of forming a bus bar electrode by heat-treating (firing) the obtained wiring is basically the same as the steps described in the finger electrode formation step.
  • the solar cell of the present invention comprises a surface electrode on the light-receiving surface side, a semiconductor substrate and a back electrode, and at least the surface electrode uses the set composition of the present invention described above, and the electrode forming method of the present invention described above. It is a solar battery cell formed using.
  • the solar battery cell of the present invention can be applied to the formation of the back electrode of the all back electrode type (so-called back contact type) solar cell, the above-described set composition of the present invention can be applied to the all back electrode type. This can also be applied to solar cells.
  • the solar cell of the present invention will be described by taking a crystalline silicon solar cell as an example.
  • the present invention is not limited to this.
  • a solar cell 10 of the present invention includes a surface electrode 1 (finger electrode 1a) on the light receiving surface side, a pn junction silicon substrate 4 in which an n layer 3 and a p layer 5 are joined (hereinafter referred to as these). In addition, it is also referred to as “crystalline silicon substrate 7”) and a back electrode 6 (full surface electrode 6a).
  • FIG. 1 is a schematic cross-sectional view taken along the line II of FIG.
  • the photovoltaic cell 10 of this invention comprises the anti-reflective film 2 in which the pyramid-like texture was formed for the reflectance reduction.
  • the solar battery cell 10 of the present invention includes a finger electrode 1a and a bus bar electrode 1b as the surface electrode 1 on the light receiving surface side. Moreover, as shown in FIG. 2B and FIG. 1, the solar battery cell 10 of the present invention includes a full-surface electrode 6 a and a connecting portion 6 b as the back electrode 6.
  • the surface electrode and / or back electrode which the photovoltaic cell of this invention comprises is at least the surface electrode formed using the set composition of this invention, arrangement
  • positioning (pitch), shape, height, width of an electrode Etc. are not particularly limited.
  • positioning (pitch), shape, height, width of an electrode Etc. are not particularly limited.
  • the surface electrode 1 having the finger electrodes 1a and the bus bar electrodes 1b is formed using the set composition of the present invention.
  • the back electrode 6 may be formed using the set composition of the present invention, but it is preferable to form the entire surface electrode 6a with an aluminum electrode and the connecting portion 6b with a silver electrode.
  • the antireflection film that the solar battery cell of the present invention may have is a film (film thickness: about 0.05 to 0.1 ⁇ m) formed on a portion of the light receiving surface where the surface electrode is not formed.
  • a film film thickness: about 0.05 to 0.1 ⁇ m
  • the crystalline silicon substrate included in the solar battery cell of the present invention is not particularly limited, and a known silicon substrate (plate thickness: about 100 to 450 ⁇ m) for forming a solar battery can be used. Any polycrystalline silicon substrate may be used.
  • the crystalline silicon substrate has a pn junction, which means that a second conductivity type light-receiving surface impurity diffusion region is formed on the surface side of the first conductivity type semiconductor substrate.
  • the second conductivity type is p-type.
  • the impurity imparting p-type include boron and aluminum
  • examples of the impurity imparting n-type include phosphorus and arsenic.
  • the solar cell module of the present invention is a solar cell module in which the solar cells of the present invention are joined in series using an interconnector whose surface is coated with solder. Below, the structure of the solar cell module of this invention is demonstrated using FIG.
  • the solar cell module 20 of the present invention is obtained by joining solar cells 10 in series using an interconnector 8 in which the surface of a metal ribbon 8b is covered with solder 8a.
  • solder 8a copper or aluminum ribbon coated with a conductive adhesive can be suitably used as the metal ribbon.
  • the bus bar electrode 1b of the front surface electrode 1 and the solder 8a of the interconnector 8 are in close contact with each other, and the connecting portion 6b of the back electrode 6 and the solder of the interconnector 8 are in contact with each other. 8a is in close contact.
  • the bus bar electrode (and the connection portion of the back electrode) is formed using the above-mentioned bus bar electrode composition, the adhesion with the solder of the interconnector is good, and it is easily modularized. can do.
  • a conductive composition for finger electrodes was prepared by adding conductive particles shown in Table 1 below to the ball mill so as to have the composition ratio shown in Table 1 and mixing them.
  • Silver powder AgC-103 (shape: spherical, average particle size: 1.5 ⁇ m, manufactured by Fukuda Metal Foil Powder Industry)
  • Solvent ⁇ -terpineol Zinc oxide: ZnO (average particle size 20-40 nm, manufactured by Teica)
  • -Bismuth oxide Bi 2 O 3 (average particle size 51 nm, manufactured by CI Kasei Co., Ltd.)
  • Conductive zinc oxide: ZnO: Al average particle size: 3.5 ⁇ m, manufactured by Honjo Chemical Co., Ltd.
  • Resin binder EC-100FTP (ethyl cellulose resin solid content: 9%, manufactured by Nisshin Kasei Co., Ltd.)
  • Glass frit lead borosilicate glass powder
  • bus bar electrode compositions B1 to B4 To the ball mill, conductive particles shown in Table 2 below were added so as to have the composition ratio shown in Table 2 below, and these were mixed to prepare a conductive composition for a bus bar electrode.
  • each component in the following 2nd table used the same thing as the said 1st table
  • Examples 1-7 Comparative Examples 1-2
  • a silicon substrate single crystal silicon wafer, LS-25TVA, 156 mm ⁇ 156 mm ⁇ 200 ⁇ m, manufactured by Shin-Etsu Chemical Co., Ltd.
  • an aluminum paste was applied to the entire back surface by screen printing and dried.
  • a predetermined wiring pattern of finger electrodes and a predetermined wiring pattern of bus bar electrodes are formed on the surface of the silicon substrate by applying the prepared conductive compositions by screen printing according to the combinations shown in Table 3 below. did.
  • a sample of a solar battery cell in which conductive wiring (finger electrodes and bus bar electrodes) was formed by baking for 60 seconds in a baking furnace at a peak temperature of 740 ° C. was produced.
  • solder adhesion> A solder ribbon (composition: Sn-3Ag-0.5Cu) was mounted on the bus bar electrode of the solar cell sample produced using a soldering iron. Thereafter, according to JIS K6850: 1999, a tensile shear test was performed at a tensile speed of 50 mm / min, and the load at break (MPa) was measured. The results are shown in Table 3 below. Here, when the load at the time of breakage is 15 MPa or more, it can be evaluated that it has solder adhesion necessary for modularization of the solar battery cell.

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Abstract

La présente invention a pour objectif un procédé pour former une électrode collectrice de pile solaire grâce auquel une électrode ayant une excellente cohésion de soudure peut être formée. Ce procédé de formation d'une électrode collectrice de pile solaire est un procédé de formation d'une électrode collectrice de pile solaire dans lequel une composition conductrice pour former une électrode collectrice de pile solaire, comprenant au moins des particules conductrices (A), de la fritte de verre (B) et un solvant (C), est utilisée pour former une électrode collectrice de pile solaire. Le procédé de formation d'une électrode collectrice de pile solaire comporte une étape de formation d'électrode-doigt dans laquelle une composition conductrice pour former une électrode-doigt contenant un oxyde métallique (D) en une proportion de 3 à 10 parts en masse pour 100 parts en masse des particules conductrices (A) est utilisée pour former une électrode-doigt ; et une étape de formation d'électrode à barre omnibus suivant l'étape de formation d'électrode-doigt, dans laquelle une composition conductrice pour former une électrode à barre omnibus contenant un oxyde métallique (D) en une proportion inférieure à 3 parts en masse pour 100 parts en masse des particules conductrices (A) est utilisée pour former une électrode à barre omnibus.
PCT/JP2012/051235 2011-04-25 2012-01-20 Procédé de formation d'électrode collectrice de pile solaire, ensemble de compositions conductrices pour formation d'électrode collectrice de pile solaire, et pile solaire WO2012147378A1 (fr)

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CN201280003092.8A CN103140932B (zh) 2011-04-25 2012-01-20 太阳能电池集电电极形成方法、太阳能电池集电电极形成用导电性组合物的套组以及太阳能电池单元
DE112012001862.1T DE112012001862T5 (de) 2011-04-25 2012-01-20 Verfahren zum Ausbilden einer Solarzellenkollektorelektrode, Satz leitfähiger Zusammensetzungen zum Ausbilden einer Solarzellenkollektorelektrode und Solarzelle

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JP2011-096880 2011-04-25
JP2011096880A JP5338846B2 (ja) 2011-04-25 2011-04-25 太陽電池集電電極形成方法、太陽電池セルおよび太陽電池モジュール

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Cited By (1)

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WO2018025920A1 (fr) 2016-08-02 2018-02-08 積水化学工業株式会社 Élément de conversion photoélectrique de type à jonction solide, film de pérovskite et module de conversion photoélectrique

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JP5955791B2 (ja) * 2013-02-12 2016-07-20 株式会社ノリタケカンパニーリミテド ペースト組成物と太陽電池
KR20180063750A (ko) 2016-12-02 2018-06-12 삼성에스디아이 주식회사 태양전지용 핑거 전극의 제조방법
CN110176506B (zh) * 2019-05-31 2024-05-07 信利半导体有限公司 薄膜光伏电池串联结构及薄膜光伏电池串联的制备工艺
CN114093552A (zh) * 2021-10-29 2022-02-25 江苏正能电子科技有限公司 一种用于钙钛矿与hjt叠层太阳能电池的正面银浆及其制备方法

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JP2007294677A (ja) * 2006-04-25 2007-11-08 Sharp Corp 太陽電池電極用導電性ペースト
JP2008135565A (ja) * 2006-11-28 2008-06-12 Kyocera Corp 太陽電池素子、及びそれを用いた太陽電池モジュール
WO2010016186A1 (fr) * 2008-08-07 2010-02-11 京都エレックス株式会社 Pâte conductrice pour la formation d'une électrode d'élément de cellule solaire, élément de cellule solaire, et procédé de fabrication dudit élément de cellule solaire

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JP2007294677A (ja) * 2006-04-25 2007-11-08 Sharp Corp 太陽電池電極用導電性ペースト
JP2008135565A (ja) * 2006-11-28 2008-06-12 Kyocera Corp 太陽電池素子、及びそれを用いた太陽電池モジュール
WO2010016186A1 (fr) * 2008-08-07 2010-02-11 京都エレックス株式会社 Pâte conductrice pour la formation d'une électrode d'élément de cellule solaire, élément de cellule solaire, et procédé de fabrication dudit élément de cellule solaire

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Publication number Priority date Publication date Assignee Title
WO2018025920A1 (fr) 2016-08-02 2018-02-08 積水化学工業株式会社 Élément de conversion photoélectrique de type à jonction solide, film de pérovskite et module de conversion photoélectrique

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JP5338846B2 (ja) 2013-11-13
CN103140932A (zh) 2013-06-05
JP2012230950A (ja) 2012-11-22

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