CN110942841A - Lead-free silver conductor slurry and preparation process thereof - Google Patents

Lead-free silver conductor slurry and preparation process thereof Download PDF

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Publication number
CN110942841A
CN110942841A CN201911281678.0A CN201911281678A CN110942841A CN 110942841 A CN110942841 A CN 110942841A CN 201911281678 A CN201911281678 A CN 201911281678A CN 110942841 A CN110942841 A CN 110942841A
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powder
total weight
accounts
organic carrier
metal powder
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王疆瑛
张景基
刘亚丕
杜汇伟
朱泽洁
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Xinchang China Metrology University Enterprise Innovation Research Institute Co Ltd
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Xinchang China Metrology University Enterprise Innovation Research Institute Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/14Conductive material dispersed in non-conductive inorganic material
    • H01B1/16Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C12/00Powdered glass; Bead compositions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20Conductive material dispersed in non-conductive organic material
    • H01B1/22Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor 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
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Computer Hardware Design (AREA)
  • Organic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photovoltaic Devices (AREA)
  • Conductive Materials (AREA)

Abstract

The invention relates to a lead-free silver conductor paste for a front electrode of a solar cell, which comprises Ag metal powder, glass powder, an organic solvent and an additive; the Ag metal powder accounts for 75-85% of the total weight of the slurry (weight ratio), and consists of two Ag metal powders with different particle sizes and shapes, wherein the particle size of the first spherical Ag metal powder is 3-10um, the particle size of the second nano flaky Ag metal powder is 20-50nm, the glass powder accounts for 6-12% of the total weight of the slurry, the organic carrier accounts for 10-20% of the total weight of the slurry, and the additive accounts for 1-5% of the total weight of the slurry. And mixing and grinding the solid powder and the organic carrier to obtain the required lead-free silver paste. The invention does not contain lead, and can greatly improve the conductivity of the electrode.

Description

Lead-free silver conductor slurry and preparation process thereof
Technical Field
The invention relates to a preparation process of silver conductor paste special for a front electrode of a solar cell. By the application technology, the silver conductor paste which is lead-free and conductive and is used for the front electrode of the solar cell is obtained.
Technical Field
From the aspect of production, the silicon solar cell production in the industry at present uses thick film paste to manufacture the front and back electrodes through screen printing and high-temperature sintering processes for either single crystal silicon cells or polycrystalline silicon cells. The back silver paste requires enough adhesion and welding tension on the basis of guaranteeing the electrical performance. Because the strong adhesion can reduce the attenuation of the contact of the electrode with the surname, the strong electrode connection is provided, and the time for outputting power by the component is prolonged; the good welding tension can prevent the shedding of the silver electrode and the fracture between the battery pieces in the assembly process. With the vigorous development of the domestic photovoltaic industry, the requirements on the conductive paste for the silver electrode of the solar photovoltaic cell are higher and higher, so that the efficiency of the solar cell is improved, and the production cost of the solar cell is reduced as much as possible. The positive silver conductive paste of the solar cell generally contains lead oxide, and the lead oxide is harmful to the environment and is not easy to control. The invention relates to a preparation process of silver conductor paste for a front electrode of a solar cell.
Disclosure of Invention
The invention aims to provide a preparation process of silver conductor paste for a front electrode of a solar cell. In order to achieve the aim, the invention adopts the technical scheme that the silver conductor paste for the front electrode of the solar cell is characterized by comprising Ag metal powder, glass powder, an organic solvent and an additive; ag metal powder accounts for 75-85 wt% of the slurry, glass powder accounts for 6-12 wt% of the slurry, organic carrier accounts for 10-20 wt% of the slurry, and additive accounts for 1-5 wt% of the slurry; the Ag metal powder consists of two Ag metal powders with different granularities and shapes, the granularity of the first spherical Ag metal powder is 3-10um, and the granularity of the second nano flaky Ag metal powder is 20-50 nm; the glass powder component is SiO 2: B2O 3; ZnO; al2O 3; TiO 2; the mass ratio (weight ratio) of MgO is 20-40%: 10-20%: 35-50%: 5-15%: 1-3%: 1 to 5 percent; the organic carrier comprises an organic solvent, a thickening agent and a surfactant; the organic solvent accounts for 88-95% of the total weight of the organic carrier and is a mixture of ethylene glycol, xylene, isopropanol and the like; the thickener is 5-10% of the total weight of the carrier, and is mixture of polyvinyl butyral, polypropylene resin, etc.; the surfactant accounts for 0.5-3% of the total weight of the organic carrier and is lecithin; the additive is Bi2O3, and accounts for 1-5% of the total weight of the slurry;
the preparation process of the silver conductor paste for the front electrode of the solar cell is characterized by comprising the following steps of:
1) preparing solid powder: fully mixing Ag metal powder, glass powder and an additive according to a proportion; the proportion of the Ag metal powder is 75-85%, the glass powder is 6-10%, and the additive is 1-5% of the total weight of the slurry; the Ag metal powder consists of two kinds of powder with different granularities, the first spherical Ag powder has the granularity of 3-10um and is spherical, the second flaky Ag powder has the granularity of 20-50nm, and the second flaky Ag powder accounts for 5-10 percent of the total weight of the whole Ag metal powder; the glass powder comprises, by weight, 220-40% of SiO, 310-20% of B2O, 35-50% of ZnO, 78-15% of Al2O 35, 21-3% of TiO, 1-5% of MgO and an additive of Bi2O 3;
2) preparing an organic solvent; weighing the components of the organic carrier, and fully stirring at the temperature of 60-90 ℃ to obtain the organic carrier; the organic carrier accounts for 10-20% of the total weight of the thick film paste and comprises an organic solvent, a thickening agent and a surfactant; the organic solvent accounts for 88-94% of the total weight of the organic carrier and is a mixture of glycol, xylene, isopropanol and the like; the thickener is 5-10% of the total weight of the carrier, and is mixture of polyvinyl butyral, acrylic resin, etc.; the surfactant accounts for 0.5-3% of the total weight of the organic carrier and is lecithin.
3) And mixing the solid powder with the organic carrier, and grinding by using a three-roll grinder to obtain the required silver conductor slurry. Printing the prepared lead-free silver conductor paste on a cleaned silicon wafer by using a screen printing technology, drying, then roasting for 10-20 minutes (min) at 750-850 ℃ in air, and carrying out performance test after naturally cooling to room temperature.
The specific implementation mode is as follows:
example 1:
preparation of glass powder by smelting method
The glass powder is prepared by adopting a smelting method, weighing SiO 220 g, B2O 315 g, ZnO 50g, Al2O 38 g, TiO22.5g and MgO 4.5g which are in accordance with the weight percentage, fully mixing and placing into a crucible, heating and melting at 1280 ℃, and performing water quenching and ball milling to obtain the required glass powder, wherein the granularity of the glass powder is 1-5 um;
selecting 70g of Ag powder with the spherical granularity of 6um, 6g of Ag powder with the flaky granularity of 40nm, 6g of glass powder with the granularity of 3um and an additive Bi2O 33 g, adding 15g of organic carrier, fully mixing, and grinding by using a three-roll grinding machine to obtain the required silver conductor slurry.
The prepared lead-free silver conductor paste is printed on a cleaned silicon chip by a screen printing technology, dried, then roasted for 15 minutes (min) in air at 750 ℃, and naturally cooled to room temperature for performance test, wherein the sheet resistance is 4.1m omega/□, and the adhesive force is more than 7.6N.
Example 2:
preparation of glass powder by smelting method
The glass powder is prepared by adopting a smelting method, weighing SiO 230 g, B2O 313 g, ZnO 50g, Al2O 35 g, TiO 21 g and MgO 1g which meet the weight percentage, fully mixing, putting into a crucible, heating and melting at 1200 ℃, performing water quenching and ball milling to obtain the required glass powder, wherein the granularity of the glass powder is 1-5 um;
75g of Ag powder with the spherical granularity of 8um, 5g of Ag powder with the flaky granularity of 30nm, 6g of glass powder with the granularity of 3um and an additive Bi2O 34 g are selected, 10g of organic carrier is added, fully mixed and ground by a three-roll grinder, and the required silver conductor slurry is obtained.
And printing the prepared lead-free silver conductor paste on a cleaned silicon wafer by using a screen printing technology, drying, then roasting for 10 minutes (min) at 850 ℃ in air, naturally cooling to room temperature, and carrying out performance test, wherein the sheet resistance is 3.1m omega/□, and the adhesive force is more than 7.4N.
Example 3:
preparation of glass powder by smelting method
The glass powder is prepared by adopting a smelting method, weighing SiO 230 g, B2O 310 g, ZnO 50g, Bi2O 36 g, TiO22 g and MgO 2g which meet the weight percentage, fully mixing and placing into a crucible, heating and melting at 1250 ℃, and performing water quenching and ball milling to obtain the required glass powder, wherein the granularity of the glass powder is 1-5 um;
76g of Ag powder with the spherical granularity of 5um, 4g of Ag powder with the flaky granularity of 30nm, 6g of glass powder with the granularity of 1um and an additive Bi2O 32 g are selected, and 12 percent of organic carrier is added to be fully mixed and ground by a three-roll grinder to obtain the required silver conductor slurry.
And printing the prepared lead-free silver conductor paste on a cleaned silicon wafer by using a screen printing technology, drying, then roasting for 10 minutes (min) at 850 ℃ in air, naturally cooling to room temperature, and carrying out performance test, wherein the sheet resistance is 3.6m omega/□, and the adhesive force is more than 7.2N.
Example 4:
preparation of glass powder by smelting method
The glass powder is prepared by adopting a smelting method, weighing SiO 225 g, B2O 315 g, ZnO 50g, Al2O 36 g, TiO 23 g and MgO 1g which meet the weight percentage, fully mixing and placing into a crucible, heating and melting at 1250 ℃, and performing water quenching and ball milling to obtain the required glass powder, wherein the granularity of the glass powder is 1-5 um;
65g of Ag powder with the spherical granularity of 3um, 10g of Ag powder with the flaky granularity of 50nm, 5g of glass powder with the granularity of 1um and an additive Bi2O 34 g are selected, and 16 percent of organic carrier is added to be fully mixed and ground by a three-roll grinder to obtain the required silver conductor slurry.
And printing the prepared lead-free silver conductor paste on a cleaned silicon wafer by using a screen printing technology, drying, then roasting for 15 minutes (min) at 800 ℃ in air, naturally cooling to room temperature, and carrying out performance test, wherein the sheet resistance is 4.4m omega/□, and the adhesive force is more than 8N.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims (3)

1. The lead-free silver conductor paste is characterized by comprising 75-85% of Ag metal powder, 5-10% of glass powder, 10-20% of organic carrier and 3-6% of additive in percentage by mass; the glass powder component is SiO 2: B2O 3; ZnO; al2O 3; TiO 2; the mass ratio (weight ratio) of MgO is 20-40%: 10-20%: 35-50%: 5-15%: 1-3%: 1 to 5 percent; the organic carrier comprises an organic solvent, a thickening agent and a surfactant; the organic solvent accounts for 88-95% of the total weight of the organic carrier and is a mixture of ethylene glycol, xylene, isopropanol and the like; the thickener is 5-12% of the total weight of the carrier, and is mixture of polyvinyl butyral, polypropylene resin, etc.; the surfactant accounts for 0.5-3% of the total weight of the organic carrier and is lecithin; the additive is Bi2O3, and the additive accounts for 1-5% of the total weight of the slurry.
2. The lead-free silver conductor paste according to claim 1, wherein the Ag metal powder is composed of two kinds of silver powders, a first spherical Ag metal powder having a particle size of 3 to 10um, and a second nano flaky Ag metal powder having a particle size of 20 to 50 um.
3. A process for preparing the lead-free silver conductor paste according to claim 1, comprising the steps of:
1) preparing solid powder: fully mixing Ag metal powder, glass powder and an additive according to a proportion; the proportion of the Ag metal powder is 75-85% of the total weight of the sizing agent, the glass powder is 6-10% of the total weight of the sizing agent, and the additive is 1-5% of the total weight of the sizing agent; the Ag metal powder consists of two kinds of powder with different granularities, the first spherical Ag powder has the granularity of 3-10um and is spherical, the second flaky Ag powder has the granularity of 20-50nm, and the second flaky Ag powder accounts for 5-10 percent of the total weight of the whole Ag metal powder; the glass powder comprises, by weight, 220-40% of SiO, 310-20% of B2O, 35-50% of ZnO, 25-15% of Al2O 35, 38-3% of TiO 21, 1-5% of MgO, and an additive of Bi2O 3;
2) preparing an organic solvent; weighing the components of the organic carrier, and fully stirring at the temperature of 60-90 ℃ to obtain the organic carrier; the organic carrier accounts for 10-20% of the total weight of the thick film paste and comprises an organic solvent, a thickening agent and a surfactant; the organic solvent accounts for 88-95% of the total weight of the organic carrier and is a mixture of ethylene glycol, xylene, absolute ethyl alcohol and the like; the thickener is 5-12% of the total weight of the carrier, and is mixture of polyvinyl butyral, acrylic resin, etc.; the surfactant accounts for 0.5-3% of the total weight of the organic carrier and is lecithin;
3) mixing and grinding the solid powder and the organic carrier to obtain the required lead-free silver slurry; printing the prepared lead-free silver conductor paste on a cleaned silicon wafer by using a screen printing technology, drying, then roasting for 10-20 minutes (min) at 750-850 ℃ in air, and carrying out performance test after naturally cooling to room temperature.
CN201911281678.0A 2019-12-13 2019-12-13 Lead-free silver conductor slurry and preparation process thereof Pending CN110942841A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698104A (en) * 2021-10-19 2021-11-26 西北大学 Bismuth trioxide nano-layer modified lead-free glass powder and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN101609850A (en) * 2009-07-14 2009-12-23 中南大学 Lead-free silver conductive paste used for positive electrode of solar battery and preparation technology thereof
CN101692410A (en) * 2009-08-21 2010-04-07 广东风华高新科技股份有限公司 Silver paste of MLCC terminal electrode
JP2012522357A (en) * 2009-03-30 2012-09-20 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー Metal pastes and their use in the production of silicon solar cells
CN103000249A (en) * 2012-12-28 2013-03-27 上海匡宇电子技术有限公司 Solar cell front-side silver paste and preparation method thereof
CN103151094A (en) * 2011-10-25 2013-06-12 赫劳斯贵金属北美康舍霍肯有限责任公司 Electroconductive paste composition containing metal nanoparticles
CN104247049A (en) * 2012-04-18 2014-12-24 赫劳斯贵金属北美康舍霍肯有限责任公司 Methods of printing solar cell contacts
CN104658634A (en) * 2015-02-03 2015-05-27 四川银河星源科技有限公司 Crystalline silicon solar battery back electrode silver paste and preparation method thereof
CN106463198A (en) * 2014-05-19 2017-02-22 太阳化学公司 A silver paste containing bismuth oxide and its use in solar cells

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012522357A (en) * 2009-03-30 2012-09-20 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー Metal pastes and their use in the production of silicon solar cells
CN101609850A (en) * 2009-07-14 2009-12-23 中南大学 Lead-free silver conductive paste used for positive electrode of solar battery and preparation technology thereof
CN101692410A (en) * 2009-08-21 2010-04-07 广东风华高新科技股份有限公司 Silver paste of MLCC terminal electrode
CN103151094A (en) * 2011-10-25 2013-06-12 赫劳斯贵金属北美康舍霍肯有限责任公司 Electroconductive paste composition containing metal nanoparticles
CN104247049A (en) * 2012-04-18 2014-12-24 赫劳斯贵金属北美康舍霍肯有限责任公司 Methods of printing solar cell contacts
CN103000249A (en) * 2012-12-28 2013-03-27 上海匡宇电子技术有限公司 Solar cell front-side silver paste and preparation method thereof
CN106463198A (en) * 2014-05-19 2017-02-22 太阳化学公司 A silver paste containing bismuth oxide and its use in solar cells
CN104658634A (en) * 2015-02-03 2015-05-27 四川银河星源科技有限公司 Crystalline silicon solar battery back electrode silver paste and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113698104A (en) * 2021-10-19 2021-11-26 西北大学 Bismuth trioxide nano-layer modified lead-free glass powder and preparation method thereof
CN113698104B (en) * 2021-10-19 2022-05-24 西北大学 Bismuth trioxide nano-layer modified lead-free glass powder and preparation method thereof

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