CN117198589A - Front silver paste of low-silver crystalline silicon solar cell, preparation method and application - Google Patents
Front silver paste of low-silver crystalline silicon solar cell, preparation method and application Download PDFInfo
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- CN117198589A CN117198589A CN202311045402.9A CN202311045402A CN117198589A CN 117198589 A CN117198589 A CN 117198589A CN 202311045402 A CN202311045402 A CN 202311045402A CN 117198589 A CN117198589 A CN 117198589A
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- 229910052709 silver Inorganic materials 0.000 title claims abstract description 100
- 239000004332 silver Substances 0.000 title claims abstract description 100
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000006229 carbon black Substances 0.000 claims abstract description 19
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- 239000011521 glass Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 7
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- 239000003960 organic solvent Substances 0.000 claims description 19
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- 238000003756 stirring Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 12
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- 238000001816 cooling Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 6
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims description 5
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 5
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 5
- -1 alcohol ester Chemical class 0.000 claims description 5
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 5
- RRQYJINTUHWNHW-UHFFFAOYSA-N 1-ethoxy-2-(2-ethoxyethoxy)ethane Chemical compound CCOCCOCCOCC RRQYJINTUHWNHW-UHFFFAOYSA-N 0.000 claims description 4
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229940019778 diethylene glycol diethyl ether Drugs 0.000 claims description 4
- OXDXXMDEEFOVHR-CLFAGFIQSA-N (z)-n-[2-[[(z)-octadec-9-enoyl]amino]ethyl]octadec-9-enamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)NCCNC(=O)CCCCCCC\C=C/CCCCCCCC OXDXXMDEEFOVHR-CLFAGFIQSA-N 0.000 claims description 3
- JCTXKRPTIMZBJT-UHFFFAOYSA-N 2,2,4-trimethylpentane-1,3-diol Chemical compound CC(C)C(O)C(C)(C)CO JCTXKRPTIMZBJT-UHFFFAOYSA-N 0.000 claims description 3
- WAEVWDZKMBQDEJ-UHFFFAOYSA-N 2-[2-(2-methoxypropoxy)propoxy]propan-1-ol Chemical compound COC(C)COC(C)COC(C)CO WAEVWDZKMBQDEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- UDSFAEKRVUSQDD-UHFFFAOYSA-N Dimethyl adipate Chemical compound COC(=O)CCCCC(=O)OC UDSFAEKRVUSQDD-UHFFFAOYSA-N 0.000 claims description 3
- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 claims description 3
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 3
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
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- 238000005096 rolling process Methods 0.000 claims description 3
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- 229940116411 terpineol Drugs 0.000 claims description 3
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- PAAZPARNPHGIKF-UHFFFAOYSA-N 1,2-dibromoethane Chemical compound BrCCBr PAAZPARNPHGIKF-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000005245 sintering Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
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- 230000001070 adhesive effect Effects 0.000 abstract description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical group CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
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- 239000001856 Ethyl cellulose Substances 0.000 description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000004359 castor oil Substances 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- COBPKKZHLDDMTB-UHFFFAOYSA-N 2-[2-(2-butoxyethoxy)ethoxy]ethanol Chemical group CCCCOCCOCCOCCO COBPKKZHLDDMTB-UHFFFAOYSA-N 0.000 description 1
- CRWNQZTZTZWPOF-UHFFFAOYSA-N 2-methyl-4-phenylpyridine Chemical compound C1=NC(C)=CC(C=2C=CC=CC=2)=C1 CRWNQZTZTZWPOF-UHFFFAOYSA-N 0.000 description 1
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 description 1
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- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000010946 fine silver Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229950008882 polysorbate Drugs 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
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Abstract
The invention discloses a front silver paste of a low-silver crystalline silicon solar cell, which comprises the following preparation raw materials in parts by weight: 80-86 parts of silver powder, 1.5-5 parts of glass powder, 1-3 parts of carbon black and 7-12 parts of organic carrier. The invention adopts the specific surface area of 0.4-1.0m 2 Silver flake powder/g and specific surface area of 1-2.2m 2 The spherical silver powder/g combined action can lead the sintering performance of the battery silver paste to be better and the adhesive force with the crystalline silicon solar cell piece to be betterThe silver layer is higher and compact. And by introducing the organic amine dispersing agent, the dispersion effect of silver powder and carbon black in silver paste can be improved while the printability is ensured, and the sintering compactness is further promoted.
Description
Technical Field
The invention relates to a front silver paste of a low-silver crystalline silicon solar cell, a preparation method and application thereof, relates to H01B, and in particular relates to a conductive material containing metal.
Background
With the development of society and the progress of science and technology, people pay more and more attention to new energy, and solar cells are receiving attention as a main means for converting renewable resources into electric energy. The silver content of the silver paste on the front surface of the solar cell on the market at present is generally 86-90%, the production cost of the cell can be increased due to the increase of the silver content, and the silver is taken as a main structure in the silver paste and can influence the photoelectric conversion efficiency of the solar cell, so that the silver paste of the solar cell with low silver content is developed, and meanwhile, the photoelectric conversion rate of the solar cell is maintained, and the cost is reduced, so that the silver paste is the technical problem to be solved urgently at present.
The Chinese patent No. 201610843628.7 discloses a high-conductivity crystalline silicon solar cell front electrode silver paste and a preparation method thereof, wherein two spherical silver powders and one flake silver powder are adopted, the silver layer of a sintered silver electrode is more compact through compounding of silver powders with different shapes and proportions, the conductivity of the sintered silver electrode is enhanced, but three silver powders can cause the increase of the resistance of a grid line, the used silver powder amount is higher, and the manufacturing cost is high. The Chinese patent No. 202210564149.7 discloses a main grid silver paste for a silicon solar cell and a preparation method thereof, wherein spherical silver powder with different particle sizes is combined, a small amount of large-particle silver powder is used as a supporting framework of a grid line, a large amount of fine silver powder with particles is matched, the contact area of the sintered surface of the main grid is increased, the height of the main grid is ensured, the output open voltage of the cell is improved, and the high open voltage also promotes the improvement of the efficiency of the cell. But the silver powder is used in an amount exceeding 85% and the production cost is high.
Disclosure of Invention
In order to reduce silver content in front silver paste of a solar cell and effectively improve photoelectric conversion rate and printing performance of the solar cell, the first aspect of the invention provides low-silver crystal silicon solar cell front silver paste, which is prepared from the following raw materials in parts by weight: 80-86 parts of silver powder, 1.5-5 parts of glass powder, 1-3 parts of carbon black and 7-12 parts of organic carrier.
As a preferred embodiment, the silver powder comprises a spherical silver powder and a plate-like silver powder, the mass ratio of the spherical silver powder to the plate-like silver powder being (35-65): (20-50).
As a preferred embodiment, the spherical silver powder has an average particle diameter of 0.8 to 2.0 μm and a specific surface area of 1 to 2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 。
As a preferred embodiment, the plate-like silver powder has an average thickness of 0.6 to 1.2. Mu.m, an average lateral dimension of 1 μm to 5. Mu.m, and a specific surface area of 0.4 to 1.0m 2 Per gram, tap density is not less than 4.2g/cm 3 。
Adopting a specific surface area of 0.4-1.0m 2 Silver flake powder/g and specific surface area of 1-2.2m 2 The spherical silver powder of/g can make the sintering performance of battery silver paste better, and it is suspected that the possible reason is that by selecting flake silver powder and spherical silver powder with proper specific surface area and particle size, the stacking density of silver powder in silver paste can be increased, during sintering, the silver powder forms a compact and uniform sintered silver layer on the crystalline silicon wafer, the adhesion force of the silver layer and the crystalline silicon wafer is increased, meanwhile, the line type of the grid line is improved, but the resistance of the grid line can be slightly increased, the resistance of the grid line can be reduced by introducing carbon black, thereby reducing the series resistance, and the introduction of carbon black further improves the aspect ratio of the grid line.
The applicant further found that the dispersion effect of the silver powder and the carbon black in the silver paste is poor, and the dispersion effect of the silver powder and the carbon black in the silver paste can be improved while the printability is ensured by introducing the organic amine dispersant, so that the compactness of sintering is further promoted. The organic amine dispersing agent can form a film on the surface of the solid particles, reduce the surface tension of the silver paste, and improve the wettability of the solid particles, so that the organic amine dispersing agent is easier to disperse in the silver paste.
As a preferred embodiment, the organic carrier is selected from one or a combination of several of organic solvents, dispersants, leveling agents, thixotropic agents, binders.
As a preferred embodiment, the organic carrier comprises 65-85 parts by weight of organic solvent, 1-10 parts by weight of binder, 10-20 parts by weight of dispersant and 3-5 parts by weight of thixotropic agent.
As a preferred embodiment, the organic solvent is selected from one or a combination of several of terpineol, tributyl citrate, polyvinyl butyral, tripropylene glycol methyl ether, DBE (dibasic acid ester), dimethyl adipate, butyl carbitol acetate, diethylene glycol butyl ether, alcohol ester twelve, diisobutyrate, diethylene glycol diethyl ether, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, pentaerythritol triacrylate.
As a preferred embodiment, the dispersing agent is an organic amine dispersing agent, and the organic amine dispersing agent is one or a combination of more than one of amino-2-methyl-1-propanol, tallow amine polyoxyethylene ether and ethylene bis-oleamide.
As a preferred embodiment, the binder is selected from one or a combination of several of rosin, cellulose, acrylic resin derivatives.
The second aspect of the invention provides a preparation method of low-silver crystalline silicon solar cell front silver paste, which comprises the following steps:
(1) Mixing and stirring organic solvent, dispersant, thixotropic agent and binder uniformly, heating and stirring at constant temperature of 50-70 ℃ for 1-2h, rotating at 2000-3000rpm of a high-speed dispersing machine, cooling and filtering to obtain an organic carrier;
(2) Adding the organic carrier, silver powder, carbon black and glass powder into a planetary stirrer, uniformly stirring at 500-1500rpm for 1-2h, and then rolling for 5-10 times by a three-roller mill until the fineness of the slurry is less than 7 mu m to obtain silver slurry.
The third aspect of the invention provides an application of low-silver front silver paste of a crystalline silicon solar cell, which is applied to the front of the crystalline silicon solar cell.
Compared with the prior art, the invention has the following beneficial effects:
(1) The front silver paste of the low-silver crystalline silicon solar cell adopts the specific surface area of 0.4-1.0m 2 Silver flake powder/g and specific surface area of 1-2.2m 2 The silver powder/g can be combined to make the silver paste of the batteryThe sintering performance of the silver-coated solar cell is better, the adhesion with the crystalline silicon solar cell is higher, and the silver layer is compact.
(2) According to the low-silver crystalline silicon solar cell front silver paste, the resistance of the grid line can be reduced under the combined action of the silver powder and the carbon black, so that the series resistance is reduced, and the aspect ratio of the grid line is further improved due to the introduction of the carbon black.
(3) According to the low-silver crystalline silicon solar cell front silver paste, the organic amine dispersing agent is introduced, so that the printing property is ensured, the dispersing effect of silver powder and carbon black in the silver paste is improved, and the sintering compactness is further promoted.
Detailed Description
Example 1
The front silver paste of the low-silver crystalline silicon solar cell comprises the following raw materials in parts by weight: 83 parts of silver powder, 3 parts of glass powder, 3 parts of carbon black and 11 parts of organic carrier.
The silver powder comprises spherical silver powder and flake silver powder, and the mass ratio of the spherical silver powder to the flake silver powder is 63:20.
the average particle diameter of the spherical silver powder is 0.8-2.0 μm, and the specific surface area is 1-2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 And model YRS-S180-3C silver powder purchased from the company of the photoelectric materials science, inc. of silver Rayleigh, suzhou.
The silver flake has an average thickness of 0.6-1.2 μm, an average lateral dimension of 1-5 μm, and a specific surface area of 0.4-1.0m 2 Per gram, tap density is not less than 4.2g/cm 3 Silver powder type XRF131, available from Zhejiang long noble metal powder limited.
The organic carrier comprises 67 parts by weight of organic solvent, 6 parts by weight of binder, 10 parts by weight of dispersing agent and 5 parts by weight of thixotropic agent.
The organic solvent is diethylene glycol diethyl ether, butyl carbitol acetate, DBE, alcohol ester twelve, polyvinyl butyral and pentaerythritol triacrylate, and the weight ratio is 45:10:10:2:2:10.
the binder is acrylic resin, purchased from Mitsubishi B842; the dispersant is organic amine RHODOLINE AN130, purchased from Soxhlet; the thixotropic agent is thixotropic agent 6500, available from Imperial Japan. The DBE is purchased from dupont; the polyvinyl butyral was purchased from colali B30HH.
The preparation method of the front silver paste of the low-silver crystalline silicon solar cell comprises the following steps:
(1) Mixing and stirring the organic solvent, the dispersing agent, the thixotropic agent and the binder uniformly, heating and stirring for 1h at the constant temperature of 60 ℃, cooling and filtering to obtain an organic carrier, wherein the rotating speed of a high-speed dispersing machine is 2500 rpm;
(2) 11 parts by weight of an organic carrier and the silver powder, carbon black and glass powder are added into a planetary stirrer, uniformly stirred at 600rpm for 1h, and then rolled for 5 times by a three-roller mill until the fineness of the slurry is less than 7 mu m, so as to obtain silver slurry.
Example 2
The front silver paste of the low-silver crystalline silicon solar cell comprises the following raw materials in parts by weight: 84 parts of silver powder, 4 parts of glass powder, 2 parts of carbon black and 10 parts of organic carrier.
The silver powder comprises spherical silver powder and flake silver powder, and the mass ratio of the spherical silver powder to the flake silver powder is 54:30.
the average particle diameter of the spherical silver powder is 0.8-2.0 μm, and the specific surface area is 1-2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 Silver powder from Ningbo Jingxin, JXEB model
The silver flake has an average thickness of 0.6-1.2 μm, an average lateral dimension of 1-5 μm, and a specific surface area of 0.4-1.0m 2 Per gram, tap density is not less than 4.2g/cm 3 Silver powder model YRS-F330 from the company of the photoelectric materials science, inc. of silver Rayleigh, suzhou
The organic carrier comprises 81 parts of organic solvent, 4 parts of binder, 12 parts of dispersing agent and 5 parts of thixotropic agent in parts by weight.
The organic solvent is diethylene glycol butyl ether acetate, alcohol ester twelve, tripropylene glycol methyl ether, dimethyl adipate, diethylene glycol dibutyl ether, polyvinyl butyral, and the weight ratio is 40:10:8:12:7:4.
the binder is DRT French Pi Nuowa rosin resin Granolite P118; the dispersing agent is NE-1802 tallow amine polyoxyethylene ether, which is purchased from Nantong Axis chemical industry Co., ltd; the thixotropic agent is thixotropic agent ST, and is purchased from Guangzhou Sida source chemical industry Co., ltd., model: sea name si modesty ST thixotropic agent. The polyvinyl butyrals are available from colali B30HH
The preparation method of the front silver paste of the low-silver crystalline silicon solar cell comprises the following steps:
(1) Mixing and stirring the organic solvent, the dispersing agent, the thixotropic agent and the binder uniformly, heating and stirring for 1h at the constant temperature of 60 ℃, cooling and filtering to obtain an organic carrier, wherein the rotating speed of a high-speed dispersing machine is 2500 rpm;
(2) 10 parts by weight of an organic carrier and the silver powder, carbon black and glass powder are added into a planetary stirrer, uniformly stirred at 1500rpm for 1.5 hours, and then rolled for 8 times by a three-roller mill until the fineness of the slurry is less than 7 mu m, so as to obtain silver slurry.
Example 3
The front silver paste of the low-silver crystalline silicon solar cell comprises the following raw materials in parts by weight: 85 parts of silver powder, 3 parts of glass powder, 3 parts of carbon black and 9 parts of organic carrier.
The silver powder comprises spherical silver powder and flake silver powder, and the mass ratio of the spherical silver powder to the flake silver powder is 35:50.
the average particle diameter of the spherical silver powder is 0.8-2.0 μm, and the specific surface area is 1-2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 Purchased from Simeite, suzhou model S590 silver powder
The silver flake has an average thickness of 0.6-1.2 μm, an average lateral dimension of 1-5 μm, and a specific surface area of 0.4-1.0m 2 Per gram, tap density is not less than 4.2g/cm 3 Purchased from national silver, model GY-1 silver powder.
The organic carrier comprises, by weight, 75 parts of an organic solvent, 4 parts of a binder, 16 parts of a dispersing agent and 5 parts of a thixotropic agent.
The organic solvent is DBE, diethylene glycol diethyl ether, terpineol and 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, and the weight ratio is 25:30:15:5.
the binder is ethyl cellulose, CAS number: 9004-57-3; the dispersing agent is ethylene bis-oleamide; the thixotropic agent is thixotropic agent hydrogenated castor oil, CAS number: 8001-78-3.
The preparation method of the front silver paste of the low-silver crystalline silicon solar cell comprises the following steps:
(1) Mixing and stirring the organic solvent, the dispersing agent, the thixotropic agent and the binder uniformly, heating and stirring for 1h at the constant temperature of 60 ℃, cooling and filtering to obtain an organic carrier, wherein the rotating speed of a high-speed dispersing machine is 2000 rpm;
(2) 9 parts by weight of organic carrier, and adding the silver powder, the carbon black and the glass powder into a planetary stirrer, uniformly stirring at 600rpm for 1h, and rolling for 5 times by a three-roller grinder until the fineness of the slurry is less than 7 mu m to obtain silver slurry.
Comparative example 1
The front silver paste of the low-silver crystalline silicon solar cell comprises the following raw materials in parts by weight: 85 parts of silver powder, 3 parts of glass powder and 12 parts of organic carrier.
The silver powder is spherical silver powder, the average particle diameter of the spherical silver powder is 0.8-2.0 mu m, and the specific surface area is 1-2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 Purchased from national silver, model SP-0320b silver powder.
The organic carrier comprises, by weight, 70 parts of an organic solvent, 8 parts of a binder, 8 parts of a dispersing agent, 11 parts of a leveling agent and 3 parts of a thixotropic agent.
The organic solvent is triethylene glycol butyl ether, ethylene glycol phenyl ether, alcohol ester twelve and diethylene glycol butyl ether acetate, and the weight ratio is 40:10:8:12.
the adhesive is a combination of ethyl cellulose and rosin resin, and the weight ratio is 1: ethylcellulose CAS no: 9004-57-3, a hydrogenated rosin resin starbyte from Pi Nuowa; the dispersing agent is polysorbate, which is purchased from the chemical industry of Jiateng; the leveling agent is cellulose acetate butyrate, and is purchased from Islaman, model CAB 572-16; the thixotropic agent is hydrogenated castor oil, CAS number: 8001-78-3.
The preparation method of the front silver paste of the low-silver crystalline silicon solar cell comprises the following steps:
(1) Mixing and stirring the organic solvent, the dispersing agent, the thixotropic agent and the binder uniformly, heating and stirring for 1h at the constant temperature of 70 ℃, cooling and filtering to obtain an organic carrier, wherein the rotating speed of a high-speed dispersing machine is 2500 rpm;
(2) 10 parts by weight of organic carrier and the silver powder, glass powder and stirring uniformly at 800rpm in a planetary stirrer are taken, and the silver powder is rolled for 8 times by a three-roller grinder until the fineness of the slurry is less than 7 mu m, so that silver slurry is obtained.
Performance testing
The silver pastes prepared in examples 1 to 3 and comparative example 1 were printed on the front side of the solar cell sheet, and tested after firing, and the test results are shown in table 1.
TABLE 1
The photoelectric conversion efficiency of examples 1,2, and 3 is significantly higher than that of comparative example 1, the current and open circuit voltage are low, the aspect ratio of the gate line of comparative example 1 is poor, and the aspect ratio of the gate line of examples 1,2, and 3 is significantly higher than that of comparative example 1, so the photoelectric conversion efficiency of examples 1,2, and 3 is higher.
Claims (10)
1. The front silver paste of the low-silver crystalline silicon solar cell is characterized by comprising the following preparation raw materials in parts by weight: 80-86 parts of silver powder, 1.5-5 parts of glass powder, 1-3 parts of carbon black and 7-12 parts of organic carrier.
2. The low-silver crystalline silicon solar cell front-side silver paste according to claim 1, wherein the silver powder comprises spherical silver powder and plate-like silver powder, and the mass ratio of the spherical silver powder to the plate-like silver powder is (35-65): (20-50).
3. The front silver paste for low-silver crystalline silicon solar cells according to claim 2, wherein the spherical silver powder has an average particle diameter of 0.8 to 2.0 μm and a specific surface area of 1 to 2.2m 2 Per gram, tap density is not less than 4.1g/cm 3 。
4. The front silver paste for low-silver crystalline silicon solar cells according to claim 2, wherein the plate-like silver powder has an average thickness of 0.6 to 1.2 μm, an average lateral dimension of 1 to 5 μm, and a specific surface area of 0.4 to 1.0m 2 Per gram, tap density is not less than 4.2g/cm 3 。
5. The low silver crystalline silicon solar cell front side silver paste of claim 2, wherein the organic carrier is selected from one or a combination of several of organic solvents, dispersants, leveling agents, thixotropic agents, binders.
6. The front silver paste of the low-silver crystalline silicon solar cell according to claim 5, wherein the organic solvent is selected from one or more of terpineol, tributyl citrate, polyvinyl butyral, DBE, tripropylene glycol methyl ether, dimethyl adipate, butyl carbitol acetate, diethylene glycol butyl ether, alcohol ester twelve, diisobutyrate, diethylene glycol diethyl ether, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, pentaerythritol triacrylate.
7. The front silver paste of the low-silver crystalline silicon solar cell according to claim 5, wherein the dispersing agent is an organic amine dispersing agent, and the organic amine dispersing agent is one or a combination of more of amino-2-methyl-1-propanol, tallow amine polyoxyethylene ether and ethylene bis-oleamide.
8. The front side silver paste of low silver crystalline silicon solar cells of claim 5 wherein the binder is selected from one or more of rosin, cellulose, acrylic resin derivatives.
9. A method for preparing the low-silver crystalline silicon solar cell front-side silver paste according to any one of claims 5 to 8, comprising the following steps:
(1) Mixing and stirring organic solvent, dispersant, thixotropic agent and binder uniformly, heating and stirring at constant temperature of 50-70 ℃ for 1-2h, rotating at 2000-3000rpm of a high-speed dispersing machine, cooling and filtering to obtain an organic carrier;
(2) Adding the organic carrier, silver powder, carbon black and glass powder into a planetary stirrer, uniformly stirring at 500-700rpm for 1-2h, and then rolling for 5-10 times by a three-roller mill until the fineness of the slurry is less than 7 mu m to obtain silver slurry.
10. Use of a low silver front side silver paste according to any of claims 1-8 for crystalline silicon solar cells, characterized in that it is applied to the front side of crystalline silicon solar cells.
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| CN202311045402.9A CN117198589A (en) | 2023-08-18 | 2023-08-18 | Front silver paste of low-silver crystalline silicon solar cell, preparation method and application |
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| CN202311045402.9A CN117198589A (en) | 2023-08-18 | 2023-08-18 | Front silver paste of low-silver crystalline silicon solar cell, preparation method and application |
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