CN109698039B - Solar back surface field aluminum paste applied to double-sided PERC battery process and preparation method thereof - Google Patents
Solar back surface field aluminum paste applied to double-sided PERC battery process and preparation method thereof Download PDFInfo
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- CN109698039B CN109698039B CN201910005332.1A CN201910005332A CN109698039B CN 109698039 B CN109698039 B CN 109698039B CN 201910005332 A CN201910005332 A CN 201910005332A CN 109698039 B CN109698039 B CN 109698039B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 44
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 title claims abstract description 17
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 title claims abstract description 17
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 50
- 230000001070 adhesive effect Effects 0.000 claims abstract description 50
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 229910000676 Si alloy Inorganic materials 0.000 claims abstract description 9
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 238000009736 wetting Methods 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-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
- 238000005516 engineering process Methods 0.000 claims description 6
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 6
- 229920001249 ethyl cellulose Polymers 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- GDXHBFHOEYVPED-UHFFFAOYSA-N 1-(2-butoxyethoxy)butane Chemical compound CCCCOCCOCCCC GDXHBFHOEYVPED-UHFFFAOYSA-N 0.000 claims description 5
- CRWNQZTZTZWPOF-UHFFFAOYSA-N 2-methyl-4-phenylpyridine Chemical compound C1=NC(C)=CC(C=2C=CC=CC=2)=C1 CRWNQZTZTZWPOF-UHFFFAOYSA-N 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 229910021485 fumed silica Inorganic materials 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000008213 purified water Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 claims description 4
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound 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 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 239000000787 lecithin Substances 0.000 claims description 3
- 235000010445 lecithin Nutrition 0.000 claims description 3
- 229940067606 lecithin Drugs 0.000 claims description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 abstract description 6
- 238000007639 printing Methods 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 18
- 239000002002 slurry Substances 0.000 description 13
- 238000002161 passivation Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000011787 zinc oxide Substances 0.000 description 9
- 238000005245 sintering Methods 0.000 description 8
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910000464 lead oxide Inorganic materials 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 2
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 2
- 238000010329 laser etching Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229940116411 terpineol Drugs 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical group [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
Images
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
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic 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
- 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
- H01L31/022441—Electrode arrangements specially adapted for back-contact 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
Abstract
The invention discloses solar back surface field aluminum paste applied to a double-sided PERC battery process, which comprises the following raw materials in percentage by mass: 18.5 percent of organic adhesive, 2 percent of inorganic adhesive, 77 percent of aluminum powder, 1 percent of leveling defoaming agent, 0.5 percent of anti-settling agent, 0.5 percent of wetting dispersant and 0.5 percent of aluminum-silicon alloy powder. The organic adhesive in the paste plays roles in dispersing powder and adjusting printing property in the paste, so that the paste has good shaping and aspect ratio after being printed by the screen printing plate fine grid, the shading area of the back of the battery is reduced, and the back efficiency is improved.
Description
Technical Field
The invention relates to the technical field of solar cell slurry, in particular to solar back surface field aluminum slurry for a double-sided PERC cell process, which consists of an organic adhesive, an inorganic adhesive, aluminum powder and an additive, and a preparation method thereof.
Background
Since the photoelectric conversion efficiency of the conventional P-type crystalline silicon cell reaches the bottleneck stage, and the market demands for high-power cells are increasing, the research, development and application of new technology and new technology are urgently needed.
In recent years, the technology of the single-crystal double-sided PERC battery is widely researched at home and abroad, and the market share is gradually expanded. The double-sided PERC battery technology is mainly characterized in that a laminated passivation film (Al) is manufactured on the back surface of the battery2O3+SiNx) And forming holes or groove grooves on the passivation film by laser etching, printing the back aluminum paste at the laser groove positions by adopting a grid line screen printing plate, and filling the grooves or the holes with the aluminum paste to form a local aluminum back field with silicon. Meanwhile, after the grid line screen printing, the aluminum paste has a good height-width ratio, the shading area of the back of the battery is reduced, and the back efficiency of the battery is improved. The structure has the advantages of double-sided power generation and great reduction of aluminum paste consumption, the front efficiency can reach 21.85-22%, and meanwhile the photoelectric conversion efficiency of the back of the battery can reach 16.5-17.6％。
The laser etching line section on the back of the double-sided PERC battery technology is the mainstream process thereof, the laser line diameter etched on the passivation film is 30-45 mu m, the line section length is 800 mu m, the silicon outward expansion needs to be reduced in the high-temperature sintering and silicon reaction process of the aluminum paste, and the formation of a cavity at the laser line opening position is avoided to influence the formation of an aluminum-silicon alloy layer.
Disclosure of Invention
In order to solve the problems in the prior art, the applicant of the present invention provides a solar back surface field aluminum paste applied to a double-sided PERC cell process and a preparation method thereof. The organic adhesive in the paste plays roles in dispersing powder and adjusting printing property in the paste, so that the paste has good shaping and aspect ratio after being printed by the screen printing plate fine grid, the shading area of the back of the battery is reduced, and the back efficiency is improved. The inorganic binder in the slurry softens and melts during sintering to provide adhesion between the aluminum layer and the passivation layer after sintering, and the inorganic binder needs to reduce damage to the back passivation film. By optimizing the components of the organic adhesive, the inorganic adhesive, the aluminum powder and the additive in the aluminum paste, the photoelectric conversion efficiency of the front and back of the double-sided PERC battery can be improved.
The technical scheme of the invention is as follows:
the solar back surface field aluminum paste applied to the double-sided PERC battery process comprises the following raw materials in percentage by mass:
the organic adhesive comprises the following raw materials in percentage by mass:
4-8% of ethyl cellulose
5-9% of phenolic resin
83-91% of an organic solvent;
the organic solvent is one or more of ethylene glycol dibutyl ether, butyl carbitol, diethylene glycol dibutyl ether, lecithin and triethylene glycol monomethyl ether.
The inorganic adhesive comprises the following raw materials in percentage by mass: 10% of PbO and SiO227％，B2O36％、ZnO 15％、SnO 9％、Al2O312％、Li2O 6％、NaOH 15％；
Fully and uniformly mixing the raw materials in a mixer, subpackaging the mixture into a ceramic crucible, and putting the crucible into a baking oven at 145-150 ℃ for baking for 2 hours; and then putting the mixture into a high-temperature smelting furnace at 1050 ℃ for smelting for 1.5 hours, taking out the mixture after smelting, performing water quenching in purified water, taking out the smelted solid after water quenching, drying the water content, crushing and ball milling, performing water-solid separation after smelting and ball milling, and drying the separated solid-inorganic adhesive in an oven at 145-150 ℃ to obtain the inorganic adhesive.
The aluminum powder has a purity of 99.98%, an average median diameter of 6.4 μm, a spherical shape, a span of 1.45, and a bulk density of 0.48g/cm3。
The leveling defoaming agent is 201-methyl silicone oil, polyether modified silicone oil,
Foamex 805、
One or more of Foamex 830.
The anti-settling agent is fumed silica.
The wetting dispersant is
Dispers651、
One or two of Dispers 650 are mixed.
A preparation method of solar back surface field aluminum paste applied to a double-sided PERC battery process comprises the following steps: stirring, dispersing and mixing uniformly 18.5% of organic adhesive, 2% of inorganic adhesive, 77% of aluminum powder, 1% of leveling defoaming agent, 0.5% of anti-settling agent, 0.5% of wetting dispersant and 0.5% of aluminum-silicon alloy powder, and grinding for 4 hours by using a three-roll grinder to obtain the solar back surface field aluminum paste.
The beneficial technical effects of the invention are as follows:
the adhesive adopted by the invention has good wettability with other solid components such as aluminum powder, and the organic adhesive formed by matching ethyl cellulose and phenolic resin has good shaping performance, the printing performance of aluminum paste on a fine grid screen with the width of 150 mu m is good, the aluminum grid lines are uniform and flat after sintering, the width is 165 mu m, the height can reach 23 mu m, and the height-to-width ratio can reach 0.14;
the organic adhesive adopted in the invention overcomes the phenomenon of slurry precipitation and agglomeration in the process of preparing the aluminum slurry, improves the suspension property and consistency of aluminum powder and other solid particles in the aluminum slurry, ensures that the aluminum powder and other solid particles are not easy to precipitate and stratify in the aluminum slurry, and prolongs the storage time.
The inorganic adhesive adopted by the method contains lead oxide, has high fluxing property in an inorganic adhesive system, can promote the formation of an aluminum-silicon eutectic body in the sintering process, and improves the uniformity and the thickness of an aluminum-silicon alloy layer. However lead ion (Pb)2 +) Has strong polarization capability, has strong corrosion effect on the passivation film substance silicon nitride on the back of the battery, and has stronger polarization capability than lead ions (Pb) in order to protect the passivation effect of the passivation film2+) Weak lithium ion (Li)+) The lead oxide is used for reducing the dosage of lead oxide in the formula, so that the corrosivity of the inorganic adhesive to the passivation film silicon nitride is reduced; when the content of ZnO in the inorganic adhesive system is higher than 12 percent, the softening point and the leveling temperature of the inorganic adhesive system show a rising trend, which is mainly because ZnO belongs to an intermediate oxide in glass, and when the content of ZnO is low, zinc oxide octahedron is used as an extra-network oxide, so that the stability of the system is weakened, and the softening point and the leveling temperature of the glass system are reduced. When the content exceeds a certain amount, zinc oxide forms tetrahedrons to enter into a structural network of the glass, so that the structure of a glass system is more stable, and the glass is characterized in that the softening point and the leveling temperature of the glass are increased, and the zinc oxide is mainly used for controlling slurryThe aggressiveness of the material to passivation films of different thicknesses.
The aluminum-silicon alloy powder adopted by the invention is mainly aluminum-silicon nano alloy powder, and the aluminum-silicon solid solubility of the alloy powder can be adjusted in high-temperature sintering, so that the outward expansion phenomenon of molten silicon in a laser wire groove is inhibited, the physical filling rate of the slurry is improved, and a thicker and uniform LBSF layer can be obtained.
The design of the fine grid width of the back surface field aluminum paste screen printing plate is 80-150 mu m, the printing performance of the aluminum paste is good, the grid line is uniform and flat, and the height-width ratio after sintering can reach 0.14-0.22.
The viscosity of the organic adhesive adopted by the invention is 7000-8500 mPa & s/25 ℃, the appearance glue solution is transparent, and no impurity is generated. The aluminum powder is spherical in appearance, the purity is more than 99.8, the median diameter is 5-8 mu m, and the span is 1.1-1.5; inorganic binder: the purity is more than 99.8, and the median diameter is 3-5 mu m.
Drawings
Fig. 1 is a schematic diagram of a double-sided PERC cell structure.
In the figure: 1. a positive silver electrode; 2. a silicon nitride layer; 3. a local aluminum silicon alloy layer; 4. an aluminum grid line; 5. a back passivation layer; 6. LBSF.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1
A preparation method of solar back surface field aluminum paste applied to a double-sided PERC battery process comprises the following steps: 18.5 percent of organic adhesive, 2 percent of inorganic adhesive, 77 percent of aluminum powder, 1 percent of leveling defoaming agent (201-methyl silicone oil), 0.5 percent of fumed silica and 0.5 percent of wetting dispersant (
Dispers651) and 0.5 percent of aluminum-silicon alloy powder are stirred, dispersed and mixed evenly, and then a three-roll grinder is used for grinding for 4 hours, thus obtaining the solar back surface field aluminum paste.
The solar back surface field aluminum paste comprises the following raw materials in percentage by mass:
the preparation method of the organic adhesive comprises the following steps: putting 8% of ethyl cellulose, 7% of phenolic resin, 15% of terpineol, 20% of ethylene glycol dibutyl ether, 15% of butyl carbitol, 25% of diethylene glycol dibutyl ether, 5% of lecithin and 5% of triethylene glycol monomethyl ether into a reaction kettle, heating by electric heating, stirring at a speed of 60r/min, keeping the temperature at 120 ℃ for 3 hours, fully dissolving and mixing the resin and the solvent in the reaction kettle, cooling, and filtering by using a 280-mesh screen to obtain the organic adhesive.
The preparation method of the inorganic adhesive comprises the following steps: mixing 10% PbO and 27% SiO2、6％B2O3、15％ZnO、9％SnO、12％Al2O3、6％Li2Fully and uniformly mixing O and 15% NaOH in a mixer, subpackaging in a ceramic crucible, putting in a drying oven at 150 ℃, and drying for 2 hours; and then putting the mixture into a high-temperature smelting furnace at 1050 ℃ for smelting for 1.5 hours, taking out the mixture after smelting, performing water quenching in purified water, taking out the smelted solid after water quenching, drying the water, crushing and performing ball milling, performing water-solid separation after smelting and performing ball milling, and drying the separated solid-inorganic adhesive in an oven at 150 ℃ to obtain the inorganic adhesive.
The aluminum powder has a purity of 99.98%, an average median diameter of 6.4 μm, a spherical shape, a span of 1.45, and a bulk density of 0.48g/cm3。
Example 2
A preparation method of solar back surface field aluminum paste applied to a double-sided PERC battery process comprises the following steps: 18.5 percent of organic adhesive, 2 percent of inorganic adhesive, 77 percent of aluminum powder and 1 percent of leveling defoaming agent (
Foamex 805), 0.5% fumed silica, 0.5% wetting dispersant(s) ((s)
Dispers 650) and 0.5% aluminum siliconAnd after the alloy powder is stirred, dispersed and uniformly mixed, grinding for 4 hours by using a three-roll grinder to obtain the solar back surface field aluminum paste.
The solar back surface field aluminum paste comprises the following raw materials in percentage by mass:
the preparation method of the organic adhesive comprises the following steps: putting 4% of ethyl cellulose, 9% of phenolic resin, 40% of ethylene glycol dibutyl ether, 25% of diethylene glycol dibutyl ether and 22% of triethylene glycol monomethyl ether into a reaction kettle, electrically heating to raise the temperature, stirring at the speed of 60r/min, keeping the temperature at 120 ℃ for 3 hours, fully dissolving and mixing the resin and the solvent in the reaction kettle, cooling, and filtering by using a 280-mesh screen to obtain the organic adhesive.
The preparation method of the inorganic adhesive comprises the following steps: mixing 10% PbO and 27% SiO2、6％B2O3、15％ZnO、9％SnO、12％Al2O3、6％Li2Fully and uniformly mixing O and 15% NaOH in a mixer, subpackaging in a ceramic crucible, putting in a baking oven at 145 ℃, and baking for 2 hours; and then putting the mixture into a high-temperature smelting furnace at 1050 ℃ for smelting for 1.5 hours, taking out the mixture after smelting, performing water quenching in purified water, taking out the smelted solid after water quenching, drying the water, crushing and performing ball milling, performing water-solid separation after smelting and performing ball milling, and drying the separated solid-inorganic adhesive in an oven at 145 ℃ to obtain the inorganic adhesive.
The aluminum powder has a purity of 99.98%, an average median diameter of 6.4 μm, a spherical shape, a span of 1.45, and a bulk density of 0.48g/cm3。
Example 3
A preparation method of solar back surface field aluminum paste applied to a double-sided PERC battery process comprises the following steps: 18.5 percent of organic adhesive, 2 percent of inorganic adhesive, 77 percent of aluminum powder and 1 percent of leveling defoaming agent (
Foamex 830), 0.5% fumed silica, 0.5% wetting dispersant(s) ((s)
Dispers651:
ispers 650 is 1:1) and 0.5 percent of aluminum-silicon alloy powder are stirred, dispersed and mixed evenly, and then a three-roll grinder is used for grinding for 4 hours, thus obtaining the solar back surface field aluminum paste.
The solar back surface field aluminum paste comprises the following raw materials in percentage by mass:
the preparation method of the organic adhesive comprises the following steps: putting 6% of ethyl cellulose, 5% of phenolic resin, 30% of terpineol, 10% of ethylene glycol dibutyl ether, 5% of butyl carbitol and 44% of diethylene glycol dibutyl ether into a reaction kettle, electrically heating to raise the temperature, stirring at the speed of 60r/min, keeping the temperature at 120 ℃ for 3 hours, fully dissolving and mixing the resin and the solvent in the reaction kettle, cooling, and filtering by using a 280-mesh screen to obtain the organic adhesive.
The preparation method of the inorganic adhesive comprises the following steps: mixing 10% PbO and 27% SiO2、6％B2O3、15％ZnO、9％SnO、12％Al2O3、6％Li2Fully and uniformly mixing O and 15% NaOH in a mixer, subpackaging in a ceramic crucible, putting in a drying oven at 150 ℃, and drying for 2 hours; and then putting the mixture into a high-temperature smelting furnace at 1050 ℃ for smelting for 1.5 hours, taking out the mixture after smelting, performing water quenching in purified water, taking out the smelted solid after water quenching, drying the water, crushing and performing ball milling, performing water-solid separation after smelting and performing ball milling, and drying the separated solid-inorganic adhesive in an oven at 145 ℃ to obtain the inorganic adhesive.
Of the aluminum powderThe purity was 99.98%, the average median diameter was 6.4 μm, the shape was spherical, the span was 1.45, and the apparent density was 0.48g/cm3。
Test example:
the slurry prepared in example 1 was tested for properties such as fineness, sheet resistance and viscosity, and the test results are shown in table 1:
TABLE 1
And (3) testing the aspect ratio: after the slurry is subjected to screen printing and sintering on grid lines with the widths of 80 microns and 150 microns, the height and width data of the aluminum grid lines are measured by adopting a 3D microscope.
Testing the filling rate of the slurry in the laser wire groove: after the slurry is sintered, selecting 3 different positions of the battery piece, scraping an aluminum layer, selecting 40 sections of laser line grooves at each sampling point, observing and measuring the cavity length of each section of laser line groove by using a 3D microscope, and obtaining the average value of the slurry filling rate by calculation.
Claims (6)
1. The solar back surface field aluminum paste applied to the double-sided PERC battery technology is characterized by comprising the following raw materials in percentage by mass:
the organic adhesive comprises the following raw materials in percentage by mass:
4-8% of ethyl cellulose
5-9% of phenolic resin
83-91% of an organic solvent;
the organic solvent is one or more of ethylene glycol dibutyl ether, butyl carbitol, diethylene glycol dibutyl ether, lecithin and triethylene glycol monomethyl ether;
the inorganic adhesive comprises the following raw materials in percentage by mass: 10% of PbO and SiO227％，B2O36％、ZnO 15％、SnO 9％、Al2O312％、Li2O 6％、NaOH 15％；
Fully and uniformly mixing the raw materials in a mixer, subpackaging the mixture into a ceramic crucible, and putting the crucible into a baking oven at 145-150 ℃ for baking for 2 hours; and then putting the mixture into a high-temperature smelting furnace at 1050 ℃ for smelting for 1.5 hours, taking out the mixture after smelting, performing water quenching in purified water, taking out the smelted solid after water quenching, drying the water content, crushing and ball milling, performing water-solid separation after smelting and ball milling, and drying the separated solid-inorganic adhesive in an oven at 145-150 ℃ to obtain the inorganic adhesive.
2. The solar back surface field aluminum paste as claimed in claim 1, wherein the aluminum powder has a purity of 99.98%, an average median diameter of 6.4 μm, a spherical shape, a span of 1.45, and a bulk density of 0.48g/cm3。
3. The solar back surface field aluminum paste as claimed in claim 1, wherein the leveling defoaming agent is 201-methyl silicone oil, polyether modified silicone oil, or polyether modified silicone oil,
Foamex 805、
One or more of Foamex 830.
4. The solar back surface field aluminum paste as claimed in claim 1, wherein the anti-settling agent is fumed silica.
5. The solar back surface field aluminum paste as claimed in claim 1, wherein the wetting dispersant is
Dispers651、
One or two of Dispers 650 are mixed.
6. The preparation method of the solar back surface field aluminum paste applied to the double-sided PERC battery process in claim 1 is characterized by comprising the following steps: stirring, dispersing and mixing uniformly 18.5% of organic adhesive, 2% of inorganic adhesive, 77% of aluminum powder, 1% of leveling defoaming agent, 0.5% of anti-settling agent, 0.5% of wetting dispersant and 0.5% of aluminum-silicon alloy powder, and grinding for 4 hours by using a three-roll grinder to obtain the solar back surface field aluminum paste.
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