CN113990553A - Electrode silver paste of nano silver-silicon composite material and preparation method thereof - Google Patents
Electrode silver paste of nano silver-silicon composite material and preparation method thereof Download PDFInfo
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- CN113990553A CN113990553A CN202111258538.9A CN202111258538A CN113990553A CN 113990553 A CN113990553 A CN 113990553A CN 202111258538 A CN202111258538 A CN 202111258538A CN 113990553 A CN113990553 A CN 113990553A
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 212
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 106
- 239000004332 silver Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 67
- XNRNVYYTHRPBDD-UHFFFAOYSA-N [Si][Ag] Chemical compound [Si][Ag] XNRNVYYTHRPBDD-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 55
- 239000010703 silicon Substances 0.000 claims abstract description 55
- 239000011521 glass Substances 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 61
- 239000002245 particle Substances 0.000 claims description 48
- 238000005303 weighing Methods 0.000 claims description 25
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 18
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 229940116411 terpineol Drugs 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 16
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 14
- 239000004952 Polyamide Substances 0.000 claims description 14
- 229920002647 polyamide Polymers 0.000 claims description 14
- 229910052708 sodium Inorganic materials 0.000 claims description 14
- 239000011734 sodium Substances 0.000 claims description 14
- 239000003960 organic solvent Substances 0.000 claims description 13
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical group CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 claims description 9
- 235000010445 lecithin Nutrition 0.000 claims description 9
- 239000000787 lecithin Substances 0.000 claims description 9
- 229940067606 lecithin Drugs 0.000 claims description 9
- 239000003981 vehicle Substances 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 239000013008 thixotropic agent Substances 0.000 claims description 7
- NQBXSWAWVZHKBZ-UHFFFAOYSA-N 2-butoxyethyl acetate Chemical compound CCCCOCCOC(C)=O NQBXSWAWVZHKBZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000001856 Ethyl cellulose Substances 0.000 claims description 6
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 6
- 229920001249 ethyl cellulose Polymers 0.000 claims description 6
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 claims description 5
- 229910021485 fumed silica Inorganic materials 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 3
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 3
- -1 methyl hydroxypropyl Chemical group 0.000 claims description 3
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 claims description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 2
- 241000779819 Syncarpia glomulifera Species 0.000 claims description 2
- 239000000944 linseed oil Substances 0.000 claims description 2
- 235000021388 linseed oil Nutrition 0.000 claims description 2
- 239000001739 pinus spp. Substances 0.000 claims description 2
- 239000012798 spherical particle Substances 0.000 claims description 2
- 229940036248 turpentine Drugs 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 39
- 229910021419 crystalline silicon Inorganic materials 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000510 noble metal Inorganic materials 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000005530 etching Methods 0.000 abstract description 4
- 238000007639 printing Methods 0.000 abstract description 4
- 238000007650 screen-printing Methods 0.000 description 17
- 238000005245 sintering Methods 0.000 description 15
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 14
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 14
- 238000007873 sieving Methods 0.000 description 14
- 239000002904 solvent Substances 0.000 description 14
- 229910001220 stainless steel Inorganic materials 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000011056 performance test Methods 0.000 description 8
- 239000012298 atmosphere Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000001293 FEMA 3089 Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910004205 SiNX Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004359 castor oil Substances 0.000 description 2
- 235000019438 castor oil Nutrition 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000004377 microelectronic Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Sustainable Development (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
- Conductive Materials (AREA)
Abstract
The invention relates to a nano silver-silicon composite material electrode silver paste and a preparation method thereof, wherein the nano silver-silicon composite material electrode silver paste comprises the following raw material components in percentage by weight: 28-63 wt% of silver powder, 25-60 wt% of nano silver silicon powder, 1-5 wt% of glass powder, 5-20 wt% of organic carrier and 0.5-2 wt% of metal additive. The nano-silver silicon composite electrode silver paste prepared by the invention is assisted to improve SiN resistance of silver paste by adding nano-silver silicon powderxThe etching reaction of the antireflection film and the silicon emitter increases the interface bonding strength and improves the peeling mechanical strength of the electrode. The nano silver-silicon composite electrode silver paste prepared by matching other components can greatly reduce the consumption of noble metal silver powder on the premise of ensuring that the electrode formed by the paste has good conductivity and photoelectric conversion rate and meeting the requirements of printing process, thereby meeting the requirements of industrial productionOn the premise of obtaining the silver paste, the production cost of the electrode silver paste of the crystalline silicon solar cell is greatly reduced.
Description
Technical Field
The invention relates to crystalline silicon solar cell electrode silver paste and a preparation method thereof, in particular to nano silver-silicon composite material electrode silver paste and a preparation method thereof.
Background
Due to the gradual depletion of fossil energy and the problem of environmental pollution generated in the use process, the development and utilization of renewable energy sources are increased in all countries. The solar energy resource is rich and pollution-free, and the development potential is huge. The traditional terminal conductive paste (also called electronic paste) is an important component of electronic components and microelectronic products, and is widely applied to the fields of metal electrodes, wiring, packaging, connection and the like in the microelectronic industry. The noble metal materials such as gold, silver, palladium and the like are generally used as the first choice of the conductive paste due to the advantages of strong stability, high precision, good reliability, long service life and the like. However, due to the rising high price of noble metals, cost reduction is also the main direction of research. The solar cell uses semiconductor materials as media to realize direct conversion of light energy and electric energy. The crystalline silicon solar cell has the characteristics of mature process, high conversion efficiency, low cost and the like, is the most widely applied solar cell at present, and occupies 90% of market share. The electrode silver paste serves as a material for metallization of the crystalline silicon solar cell, plays a crucial role in photoelectric conversion efficiency of the cell, and accounts for a large proportion of the production cost of the cell. China is the largest producing country of solar cell modules in the world, and the production cost of the domestic cell module is greatly raised by relying on imported metalized materials for a long time, so that the novel solar electrode silver paste is developed, the production cost of the silver paste is reduced, the foreign technical monopoly is broken, and the solar cell module has great strategic significance.
At present, electrode silver paste in the prior art mainly consists of three parts: the conductive item is mainly silver micro powder with the best conductive performance, the organic phase is an organic carrier suitable for a screen printing technology, and the organic carrier mainly comprises an organic solvent, a plasticizer, a thixotropic agent, a leveling agent, a surfactant and the like, so that the slurry has rheological properties such as viscosity, thixotropy and the like suitable for screen printing; the inorganic terms are mainly low glass powder and metal oxides, and play roles in burning through the anti-reflection layer and bonding. Particularly, for the front silver paste of the crystalline silicon solar cell, the front silver paste is positioned on the light receiving surface, so that the height-width ratio of the front silver paste has higher requirements compared with the height-width ratio of the back silver paste, and the electrode silver paste capable of corroding the silicon nitride layer and the silicon substrate to form good ohmic contact and bonding strength is selected, thereby being more beneficial to the operation of a printing process. However, while meeting these requirements, the silver powder is expensive, the addition amount of the silver powder seriously affects the conductivity and the photoelectric conversion rate of the silver paste on the front surface of the whole crystalline silicon solar cell, and once the usage amount of the silver powder is reduced, the performance index required by the industry cannot be ensured, so the cost problem is always a main factor for hindering the development of the crystalline silicon solar cell.
Disclosure of Invention
The invention aims to provide a nano silver-silicon composite material electrode silver paste which can meet various performance tests and normal production requirements and can reduce the production cost of crystalline silicon solar energy and a preparation method thereof.
In order to achieve the purpose, the invention provides electrode silver paste made of a nano silver-silicon composite material.
Preferably, the material comprises the following raw material components in percentage by weight: 28-63 wt% of silver powder, 25-60 wt% of nano silver silicon powder, 1-5 wt% of glass powder, 5-20 wt% of organic carrier and 0.5-2 wt% of metal additive.
Preferably, the silver powder comprises two micron spherical silver powders with different particle sizes and one nanometer spherical silver powder, the particle sizes of the two micron spherical silver powders are respectively 1.85-2.15 μm and 0.98-1.22 μm, the composition ratio is (2-3): 1-1.5), the addition amount of the nanometer spherical silver powder is 0-8 wt%, and the particle size is 200-400 nm.
Preferably, the two micron spherical silver powders with different particle sizes have the average particle sizes of 2.0 μm and 1.1 μm respectively, and the nano spherical silver powder has the average particle size of 300 nm.
Preferably, the nano silver silicon powder is nano spherical particles, the silicon content is 10-80 wt%, and the particle size is 500-700 nm.
Preferably, the glass powder is TeO2-Bi2O3-B2O3The glass powder has a particle size of 1.2 to 1.4 μm and an average particle size of 1.3. mu.m.
Preferably, the organic vehicle comprises a first organic vehicle and a second organic vehicle.
Preferably, the first organic vehicle comprises a mass ratio of 5: (2-4) the organic solvent, the thickening agent and the surfactant of (1-2), wherein the second organic carrier comprises the following components in percentage by mass (4-7): (6-3) an organic solvent and a thixotropic agent.
Preferably, the organic solvent is one or more of terpineol, turpentine diatol, diethylene glycol butyl ether, cyclohexanol, tributyl citrate and ethylene glycol butyl ether acetate;
the thickening agent is selected from one of ethyl cellulose, isobutyl methacrylate, hexyl cellulose, hydroxyethyl cellulose and methyl hydroxypropyl cellulose;
the thixotropic agent is selected from one of fumed silica, organic bentonite, hydrogenated linseed oil and polyamide sodium;
the surfactant is lecithin.
Preferably, the metal additive is nano nickel powder.
Preferably, the preparation method of the electrode silver paste of the nano-silver-silicon composite material comprises the following steps:
the method comprises the following steps: weighing an organic solvent, a thickening agent and a surfactant according to the mass ratio of (2-4) to (1-2), uniformly stirring at constant temperature, and filtering the dissolved mixture to obtain a first organic carrier;
step two: according to the formula (4-7): (6-3) weighing the organic solvent and the thixotropic agent according to the mass ratio, uniformly stirring at a constant temperature, and filtering the dissolved mixture to obtain a second organic carrier;
step three: uniformly mixing the first organic carrier and the second organic carrier respectively according to the total mass percent of 0-10 wt% and 0-10 wt% to obtain an organic carrier;
step four: uniformly mixing silver powder, nano silver silicon powder, glass powder, an organic carrier and a metal additive according to the raw material component ratio of the nano silver-silicon composite material electrode silver paste, and adding an organic solvent to adjust the viscosity according to a required viscosity target; and finally, rolling the mixture until the mixture is uniformly dispersed and the fineness of the mixture is less than 5 mu m to obtain the nano silver silicon composite material electrode silver paste added with the nano silver silicon powder.
Compared with the prior art, the invention has the following beneficial technical effects:
through tests, compared with the crystalline silicon solar cell silver paste on the market, the content of the noble metal silver powder is reduced by 17% -61%, and the cost is far lower than that of the crystalline silicon solar cell silver paste on the market. Meanwhile, the height-to-width ratio of the sintered grid line film is more than 0.380, the viscosity is 220 +/-20 and can reach 207kcps (25 ℃), the tensile strength is more than 7N and is more than 3N, the photoelectric conversion rate can reach more than 17.8 percent, the high height-to-width ratio and the photoelectric conversion efficiency are good, and the tensile stress between the silicon substrate and the silver layer is obviously improved by the nano silver silicon powder added in the raw materials, so that the nano silver silicon composite electrode silver paste has strong bonding strength and is more favorable for a screen printing process.
Secondly, in the preparation process of the nano-silver-silicon composite electrode silver paste, the shrinkage behavior of the silver paste in the sintering process is adjusted by adjusting the morphology and the distribution performance of the particle sizes of the silver powder, and the sintered nano-silver-silicon composite electrode silver paste has better compactness by adopting the matching use of micro-nano particles with different particle sizes and good sphericity, so that the contact quality of a silver-silicon interface of the sintered nano-silver-silicon composite electrode silver paste is more excellent.
The nano silver silicon powder added into the nano silver silicon composite material electrode silver paste can enable the silver paste to be SiNxThe etching reaction of the antireflection film and the silicon emitter is improved, and the antireflection film has high interface bonding strength and high electrode peeling mechanical strength.
TeO adopted in silver paste of nano silver-silicon composite material electrode2-i2O3-B2O3The glass powder is lead-free glass powder, and accords with the main trend of no toxicity and no harm. Glass frit for etching SiNxThe antireflection film is a transmission medium of silver, promotes the migration of silver in the electrode, and ensures the good performance of a silver-silicon interface. However, the content of the glass powder should not be too high, otherwise, excessive etching of the silicon emitter by the glass during metallization may cause junction damage, and further, the electrical performance of the battery is affected. Therefore, the present invention preferably sets the content of the glass frit to 1 to 5 wt%.
The organic carrier added into the electrode silver paste of the nano silver-silicon composite material is a dispersion medium of solid particles, and plays a role in endowing the silver paste with proper viscosity and rheological property and enabling the silver paste to be suitable for printing. The invention carries out layered addition on the organic carrier so as to adjust the rheological property of the silver paste within a target range.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 15.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 10 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 3.0 wt% of nano spherical silver powder, 60.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 3.0 wt% of first organic carrier, 4.0 wt% of second organic carrier and 2.0 wt% of solvent diethylene glycol monobutyl ether.
Preparation of organic carrier: weighing 1.5 wt% of terpineol, putting the terpineol into a constant-temperature water bath glass reaction kettle, heating the mixture to 80 ℃, adding 0.9 wt% of ethyl cellulose and 0.6 wt% of lecithin, stirring the mixture at 80 ℃ for 4 hours until the mixture is completely dissolved, and sieving the mixture through a 250-mesh stainless steel sieve mesh to obtain the first organic carrier. Weighing 2.0 wt% of terpineol, putting the terpineol into another thermostatic waterbath glass reaction kettle, heating the mixture to 80 ℃, weighing 2.0 wt% of polyamide sodium, adding the polyamide sodium into the reaction kettle, stirring the mixture for 4 hours at 80 ℃ until the polyamide sodium is completely dissolved, and sieving the mixture through a stainless steel screen of 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: according to the weight percentage, 15.0 percent wt of spherical silver powder with the particle size of 2.0 mu m, 10.0 percent wt of spherical silver powder with the particle size of 1.1 mu m, 3.0 percent wt of nano spherical silver powder, 60.0 percent wt of nano silver silicon powder with the silicon content of 50 percent, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 3.0 wt% of first organic carrier and 4.0 wt% of second organic carrier, and then 2.0 wt% of solvent diethylene glycol monobutyl ether is added to adjust the mixture to the target viscosity, the mixture is completely put into a double-planet stirrer to be uniformly mixed, and the mixed substance is rolled on a three-roll mill for 10-12 times until the mixed substance is uniformly dispersed, and the fineness is below 5 mu m, so that the nano silver silicon composite material electrode silver paste added with nano silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Through tests, the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.382, the viscosity of 236kcps (25 ℃), the tensile strength of 7.9N and the photoelectric conversion rate of 17.843%.
Example 2
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 17.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 13 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 3.0 wt% of nano spherical silver powder, 55.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier, 3.0 wt% of second organic carrier and 2.0 wt% of solvent diethylene glycol monobutyl ether.
Preparation of organic carrier: weighing 2.1 wt% of ethylene glycol butyl ether acetate, putting the ethylene glycol butyl ether acetate into a constant-temperature water bath glass reaction kettle, heating the mixture to 80 ℃, adding 1.2 wt% of methyl hydroxypropyl cellulose and 0.7 wt% of lecithin, stirring the mixture at 80 ℃ for 4 hours until the mixture is completely dissolved, and sieving the mixture through a 250-mesh stainless steel sieve to obtain the first organic carrier. Weighing 1.5 wt% of turpentine oil to permeate alcohol, putting the turpentine oil into another constant-temperature water bath glass reaction kettle, heating the turpentine oil to 80 ℃, weighing 1.5 wt% of organic bentonite, adding the organic bentonite into the reaction kettle, stirring the mixture for 4 hours at the temperature of 80 ℃ until the organic bentonite is completely dissolved, and sieving the mixture through a stainless steel screen with 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: 17.0 wt% of spherical silver powder with the particle size of 2.0 mu m, 13.0 wt% of spherical silver powder with the particle size of 1.1 mu m, 3.0 wt% of nano spherical silver powder, 55.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier, 3.0 wt% of second organic carrier, 2.0 wt% of solvent diethylene glycol monobutyl ether is added to adjust the mixture to target viscosity, and the mixture is put into a double-planet stirrer to be mixed uniformlyAnd (3) uniformly rolling the mixed substances on a three-roller machine for 10-12 times until the mixed substances are uniformly dispersed and the fineness is below 5 mu m, thus obtaining the nano silver silicon composite material electrode silver paste added with nano silver silicon powder.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Tests prove that the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.384, the viscosity of 232kcps (25 ℃), the tensile strength of 7.8N and the photoelectric conversion rate of 17.862%.
Example 3
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 21.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 14.0 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 3.0 wt% of nano spherical silver powder, 50.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 3.0 wt% of first organic carrier, 4.0 wt% of second organic carrier and 2.0 wt% of solvent diethylene glycol monobutyl ether.
Preparation of organic carrier: weighing 1.6 wt% of terpineol, putting the terpineol into a constant-temperature water bath glass reaction kettle, heating the mixture to 80 ℃, then adding 0.8 wt% of hydroxyethyl cellulose and 0.6 wt% of lecithin, stirring the mixture for 4 hours at 80 ℃ until the mixture is completely mixed and dissolved, and sieving the mixture through a 250-mesh stainless steel sieve mesh to obtain the first organic carrier. Weighing 2.0 wt% of cyclohexanol, placing the cyclohexanol into another thermostatic waterbath glass reaction kettle, heating to 80 ℃, weighing 2.0 wt% of hydrogenated castor oil, adding the hydrogenated castor oil into the reaction kettle, stirring for 4 hours at 80 ℃ until the cyclohexanol is completely dissolved, and sieving the mixture through a 250-mesh stainless steel screen to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: according to the weight percentage, 21.0wt percent of spherical silver powder with the particle size of 2.0 mu m, 14.0wt percent of spherical silver powder with the particle size of 1.1 mu m, 3.0wt percent of nano spherical silver powder, 50.0wt percent of nano silver silicon powder with the silicon content of 50 percent, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 3.0 wt% of first organic carrier and 4.0 wt% of second organic carrier, adding 2.0 wt% of solvent diethylene glycol monobutyl ether to adjust the mixture to the target viscosity, putting the mixture into a double-planet stirrer to be uniformly mixed, rolling the mixed substance on a three-roll mill for 10-12 times until the mixed substance is uniformly dispersed, wherein the fineness is below 5 mu m, and thus the nano silver silicon composite electrode silver paste added with nano silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Through tests, the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.388, the viscosity of 228kcps (25 ℃), the tensile strength of 7.7N and the photoelectric conversion rate of 17.893%.
Example 4
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 24.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 16.0 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 3.0 wt% of nano spherical silver powder, 45.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 2.6 wt% of first organic carrier, 4.0 wt% of second organic carrier and 2.4 wt% of solvent diethylene glycol monobutyl ether.
Preparation of organic carrier: weighing 1.5 wt% of terpineol, putting the terpineol into a constant temperature water bath glass reaction kettle, heating to 80 ℃, adding 0.6 wt% of ethyl cellulose and 0.5 wt% of lecithin, stirring for 4 hours at 80 ℃ until the materials are completely mixed and dissolved, and sieving by a 250-mesh stainless steel sieve mesh to obtain the first organic carrier. Weighing 2.0 wt% of diethylene glycol butyl ether, heating the diethylene glycol butyl ether in a reaction kettle to 80 ℃, weighing 2.0 wt% of fumed silica, adding the fumed silica into the reaction kettle, stirring the mixture for 4 hours at 80 ℃ until the fumed silica is completely mixed and dissolved, and sieving the mixture through a stainless steel screen with 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: the particle size is sequentially calculated according to the weight percentage24.0 wt% of 2.0 mu m micron spherical silver powder, 16.0 wt% of 1.1 mu m micron spherical silver powder, 6.0 wt% of nano spherical silver powder, 45.0 wt% of nano silver silicon powder containing 50% of silicon, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 2.6 wt% of first organic carrier and 4.0 wt% of second organic carrier, adding 2.4 wt% of solvent diethylene glycol monobutyl ether to adjust the mixture to the target viscosity, putting the mixture into a double-planet stirrer to be uniformly mixed, rolling the mixed substance on a three-roll mill for 10-12 times until the mixed substance is uniformly dispersed, wherein the fineness is below 5 mu m, and thus the nano silver silicon composite electrode silver paste added with nano silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Tests prove that the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.391, the viscosity of 230kcps (25 ℃), the tensile strength of 7.6N and the photoelectric conversion rate of 17.906%.
Example 5
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 25.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 17.0 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 40.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier, 3.0 wt% of second organic carrier and 2.0 wt% of solvent terpineol.
Preparation of organic carrier: weighing 2.2 wt% of tributyl citrate, putting the tributyl citrate into a constant-temperature water bath glass reaction kettle, heating the tributyl citrate to 80 ℃, adding 1.0 wt% of ethyl cellulose and 0.8 wt% of lecithin, stirring the mixture for 4 hours at 80 ℃ until the mixture is completely mixed and dissolved, and sieving the mixture through a 250-mesh stainless steel sieve to obtain the first organic carrier. Weighing 1.6 wt% of diethylene glycol monobutyl ether, putting the diethylene glycol monobutyl ether into another constant-temperature water bath glass reaction kettle, heating the diethylene glycol monobutyl ether to 80 ℃, weighing 1.4 wt% of polyamide sodium, adding the polyamide sodium into the reaction kettle, stirring the mixture at the temperature of 80 ℃ for 4 hours until the polyamide sodium is completely dissolved, and sieving the mixture through a stainless steel screen with 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: 25.0 wt% of spherical silver powder with the particle size of 2.0 mu m, 17.0 wt% of spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 40.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier and 3.0 wt% of second organic carrier, and then 2.0 wt% of terpineol solvent is added to adjust the mixture to the target viscosity, and the mixed substances are rolled on a three-roller machine for 10-12 times until the mixed substances are uniformly dispersed and the fineness is below 5 mu m, so that the nano silver silicon composite electrode silver paste added with nano silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Tests prove that the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.394, the viscosity of 221kcps (25 ℃), the tensile strength of 7.5N and the photoelectric conversion rate of 17.926%.
Example 6
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 32.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 20.0 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 30.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier, 3.0 wt% of second organic carrier and 2.0 wt% of solvent terpineol.
Preparation of organic carrier: weighing 2.2 wt% of tributyl citrate, putting the tributyl citrate into a constant-temperature water bath glass reaction kettle, heating the tributyl citrate to 80 ℃, adding 1.0 wt% of ethyl cellulose and 0.8 wt% of lecithin, stirring the mixture for 4 hours at 80 ℃ until the mixture is completely mixed and dissolved, and sieving the mixture through a 250-mesh stainless steel sieve to obtain the first organic carrier. Weighing 1.5 wt% of diethylene glycol monobutyl ether, putting the diethylene glycol monobutyl ether into another constant-temperature water bath glass reaction kettle, heating the diethylene glycol monobutyl ether to 80 ℃, weighing 1.5 wt% of polyamide sodium, adding the polyamide sodium into the reaction kettle, stirring the mixture at the temperature of 80 ℃ for 4 hours until the polyamide sodium is completely dissolved, and sieving the mixture through a stainless steel screen with 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: 32.0 wt% of spherical silver powder with the particle size of 2.0 mu m, 20.0 wt% of spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 30.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier and 3.0 wt% of second organic carrier, and then 2.0 wt% of terpineol solvent is added to adjust the mixture to the target viscosity, and the mixed substances are rolled on a three-roller machine for 10-12 times until the mixed substances are uniformly dispersed and the fineness is below 5 mu m, so that the nano silver-silicon composite electrode silver paste added with silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Tests prove that the sintered silver paste of the nano silver-silicon composite electrode has the film aspect ratio of 0.402, the viscosity of 235kcps (25 ℃), the tensile strength of 7.5N and the photoelectric conversion rate of 18.013%.
Example 7
The silver paste for the nano-silver-silicon composite electrode comprises the following raw materials in percentage by weight: 35.0 wt% of micron spherical silver powder with the particle size of 2.0 mu m, 22.0 wt% of micron spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 25.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier, 3.0 wt% of second organic carrier and 2.0 wt% of solvent terpineol.
Preparation of organic carrier: weighing 2.2 wt% of ethylene glycol monobutyl ether acetate, putting the ethylene glycol monobutyl ether acetate into a constant-temperature water bath glass reaction kettle, heating the mixture to 80 ℃, adding 1.0 wt% of hexyl cellulose and 0.8 wt% of lecithin, stirring the mixture for 4 hours at 80 ℃ until the mixture is completely mixed and dissolved, and sieving the mixture through a 250-mesh stainless steel sieve to obtain the first organic carrier. Weighing 1.7 wt% of terpineol, putting the terpineol into another thermostatic waterbath glass reaction kettle, heating the mixture to 80 ℃, weighing 1.3 wt% of polyamide sodium, adding the polyamide sodium into the reaction kettle, stirring the mixture at 80 ℃ for 4 hours until the polyamide sodium is completely dissolved, and sieving the mixture through a stainless steel screen with 250 meshes to obtain a second organic carrier.
Preparing nano silver-silicon composite electrode silver paste: according to the weight percentage, 35.0 wt% of spherical silver powder with the particle size of 2.0 mu m, 22.0 wt% of spherical silver powder with the particle size of 1.1 mu m, 6.0 wt% of nano spherical silver powder, 25.0 wt% of nano silver silicon powder with the silicon content of 50%, and TeO2-Bi2O3-B2O32.2 wt% of glass powder, 0.8 wt% of nickel powder, 4.0 wt% of first organic carrier and 3.0 wt% of second organic carrier, and then 2.0 wt% of terpineol solvent is added to adjust the mixture to the target viscosity, and the mixed substances are rolled on a three-roller machine for 10-12 times until the mixed substances are uniformly dispersed and the fineness is below 5 mu m, so that the nano silver silicon composite electrode silver paste added with nano silver silicon powder can be obtained.
And (3) screen-printing the uniformly dispersed nano silver-silicon composite material electrode silver paste on a silicon chip through screen printing, drying at 280 ℃, sintering in an air atmosphere, and carrying out a performance test at a sintering peak temperature of 910 ℃.
Through tests, the sintered nano silver-silicon composite electrode silver paste has the film aspect ratio of 0.408, the viscosity of 228kcps (25 ℃), the tensile strength of 6.9N and the photoelectric conversion rate of 18.095%.
Compared with the crystalline silicon solar cell silver paste on the current market, the nano silver-silicon composite material electrode silver paste test results of the crystalline silicon solar cells prepared in the above embodiments 1 to 7 have good printability and photoelectric conversion efficiency, the added nano silver-silicon powder significantly improves the tensile strength between the silicon substrate and the silver layer, the cost of the silver paste is reduced due to the reduction of the noble metal silver powder, and the comparison of the test results is shown in the following table:
according to the invention, the silver silicon powder is added into the electrode silver paste of the crystalline silicon solar cell to adjust the consumption of the noble metal silver, compared with the crystalline silicon solar cell silver paste on the market, on the premise of ensuring that the electrode formed by the paste has good conductivity and photoelectric conversion rate and meeting the printing process requirements, the consumption of the noble metal silver powder can be greatly reduced, so that the production cost of the electrode silver paste of the crystalline silicon solar cell is greatly reduced on the premise of meeting the industrial production requirements.
Claims (10)
1. The nano-silver-silicon composite electrode silver paste is characterized by comprising the following raw material components in percentage by weight: 28-63 wt% of silver powder, 25-60 wt% of nano silver silicon powder, 1-5 wt% of glass powder, 5-20 wt% of organic carrier and 0.5-2 wt% of metal additive.
2. The electrode silver paste of the nano silver-silicon composite material according to claim 1, wherein the silver powder comprises two kinds of micron spherical silver powders with different particle sizes and one kind of nano spherical silver powder, the particle sizes of the two kinds of micron spherical silver powders are respectively 1.85 μm to 2.15 μm and 0.98 μm to 1.22 μm, the composition ratio is (2-3): (1-1.5), the addition amount of the nano spherical silver powder is 0-8 wt%, and the particle size is 200nm to 400 nm.
3. The electrode silver paste of nano silver-silicon composite material according to claim 2, wherein the two micron spherical silver powders with different particle sizes have an average particle size of 2.0 μm and 1.1 μm, respectively, and the average particle size of the nano spherical silver powder is 300 nm.
4. The electrode silver paste of the nano silver-silicon composite material according to claim 1, wherein the nano silver-silicon powder is nano spherical particles, the silicon content is 10-80 wt%, and the particle size is 500-700 nm.
5. The electrode silver paste of nano-silver-silicon composite material according to claim 1, wherein the glass powder is TeO2-Bi2O3-B2O3The glass powder has a particle size of 1.2 to 1.4 μm and an average particle size of 1.3. mu.m.
6. The nanosilver silicon composite electrode silver paste of claim 1, wherein the organic vehicle comprises a first organic vehicle and a second organic vehicle.
7. The nano-silver silicon composite electrode silver paste of claim 6, wherein the first organic vehicle comprises a mixture of, by mass, 5: (2-4) the organic solvent, the thickening agent and the surfactant of (1-2), wherein the second organic carrier comprises the following components in percentage by mass (4-7): (6-3) an organic solvent and a thixotropic agent.
8. The electrode silver paste of nano silver-silicon composite material of claim 7, wherein the organic solvent is one or more of terpineol, turpentine diatol, diethylene glycol butyl ether, cyclohexanol, tributyl citrate and ethylene glycol butyl ether acetate,
the thickening agent is selected from one of ethyl cellulose, isobutyl methacrylate, hexyl cellulose, hydroxyethyl cellulose and methyl hydroxypropyl cellulose,
the thixotropic agent is selected from one of fumed silica, organic bentonite, hydrogenated linseed oil and polyamide sodium,
the surfactant is lecithin.
9. The electrode silver paste of nano silver-silicon composite material according to claim 1, wherein the metal additive is nano nickel powder.
10. A method for preparing electrode silver paste of nano silver-silicon composite material is characterized by comprising the following steps,
the method comprises the following steps: weighing an organic solvent, a thickening agent and a surfactant according to the mass ratio of (2-4) to (1-2), uniformly stirring at constant temperature, and filtering the dissolved mixture to obtain a first organic carrier;
step two: according to the formula (4-7): (6-3) weighing the organic solvent and the thixotropic agent according to the mass ratio, uniformly stirring at a constant temperature, and filtering the dissolved mixture to obtain a second organic carrier;
step three: uniformly mixing the first organic carrier and the second organic carrier respectively according to the total mass percent of 0-10 wt% and 0-10 wt% to obtain an organic carrier;
step four: according to the raw material component ratio of the nano silver-silicon composite electrode silver paste in claim 1, after uniformly mixing silver powder, nano silver-silicon powder, glass powder, an organic carrier and a metal additive, adding an organic solvent to adjust the viscosity according to a required viscosity target; and finally, rolling the mixture until the mixture is uniformly dispersed and the fineness of the mixture is less than 5 mu m to obtain the nano silver silicon composite material electrode silver paste added with the nano silver silicon powder.
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