CN114188068A - Organic carrier for aluminum paste on back of double-sided PERC solar cell and preparation method thereof - Google Patents
Organic carrier for aluminum paste on back of double-sided PERC solar cell and preparation method thereof Download PDFInfo
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 104
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 title claims abstract 10
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 title claims abstract 10
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 title claims abstract 10
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000003960 organic solvent Substances 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 15
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 12
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 12
- 229940116411 terpineol Drugs 0.000 claims description 12
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 11
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims description 11
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims description 11
- IFPMZBBHBZQTOV-UHFFFAOYSA-N 1,3,5-trinitro-2-(2,4,6-trinitrophenyl)-4-[2,4,6-trinitro-3-(2,4,6-trinitrophenyl)phenyl]benzene Chemical compound [O-][N+](=O)C1=CC([N+](=O)[O-])=CC([N+]([O-])=O)=C1C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C(C=2C(=C(C=3C(=CC(=CC=3[N+]([O-])=O)[N+]([O-])=O)[N+]([O-])=O)C(=CC=2[N+]([O-])=O)[N+]([O-])=O)[N+]([O-])=O)=C1[N+]([O-])=O IFPMZBBHBZQTOV-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 150000002148 esters Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 229920002301 cellulose acetate Polymers 0.000 claims description 2
- 238000007639 printing Methods 0.000 abstract description 19
- 230000009974 thixotropic effect Effects 0.000 abstract description 6
- 238000009736 wetting Methods 0.000 abstract description 6
- 238000007650 screen-printing Methods 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract description 4
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 16
- 238000005245 sintering Methods 0.000 description 9
- 239000001856 Ethyl cellulose Substances 0.000 description 7
- 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 description 7
- 229920001249 ethyl cellulose Polymers 0.000 description 7
- 235000019325 ethyl cellulose Nutrition 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 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
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
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- 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
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- 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
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- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sustainable Energy (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
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Abstract
The invention discloses an organic carrier for aluminum paste on the back of a double-sided PERC solar cell and a preparation method thereof. The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 30-60% of organic resin and 40-70% of organic solvent. According to the organic carrier, the organic resin and the organic solvent are compounded according to the proportion, so that on one hand, an organic carrier system has proper viscosity, the uniformity and compactness of a film layer after the aluminum grid line subjected to screen printing is sintered are ensured, and the organic carrier has stronger dispersing and wetting capacity on the aluminum paste main body aluminum powder on the back of the double-sided PERC solar cell and can keep the stability of the viscosity of the aluminum paste prepared by the organic carrier; on the other hand, the thixotropic property of the organic carrier is improved, the line width is reduced, the back rate of the double-sided battery is increased, and meanwhile, the continuous printing capability is ensured, namely, the phenomena of printing missing, virtual printing, uneven thickness, slurry leakage and the like can not occur.
Description
Technical Field
The invention belongs to the technical field of battery back electrode slurry, and particularly relates to an organic carrier for back aluminum slurry of a double-sided PERC solar battery and a preparation method thereof.
Background
At present, a Passivated Emitter Rear Contact (PERC) technology is used in the field of crystalline silicon solar cells in batches, the efficiency of single-sided PERC solar cells produced commercially at present is about 22.0-23.0%, and the efficiency improvement space of the single-sided PERC solar cells is not large and is difficult to break through further. Therefore, in order to meet the market demand for high-power components, the double-sided PERC solar cell rapidly occupies the mainstream status of the market by virtue of the advantages of high output power, low cost and the like brought by additional power generation on the back surface of the double-sided PERC solar cell.
The back of the double-sided PERC solar cell adopts an aluminum grid line structure to replace the full aluminum back field structure of the traditional single-sided PERC cell, the aluminum line on the back of the double-sided PERC solar cell forms good ohmic contact with silicon in a laser grooving area on a passivation film, the front and the back of the double-sided PERC solar cell can receive light and generate electricity, the back of the double-sided PERC solar cell can collect 10-30% of sunlight, the electricity generation amount of each W component can be increased by 20%, and the electricity cost per W degree can be reduced by 7-10%. The double-sided PERC battery has the advantages of double-sided power generation, high reliability of the double-glass packaging assembly, low consumption of aluminum paste and the like, and is very high in compatibility with the traditional battery technology.
The double-sided PERC aluminum paste only forms aluminum-silicon reaction and contact in a local area after sintering. Because the double-sided PERC aluminum paste is only printed in the area where the film is opened by the laser and is in a grid line shape during printing, the local good BSF layer and ohmic contact and the small bulk resistance of the aluminum layer are beneficial to improving the efficiency of the double-sided PERC battery.
The double-sided PERC battery aluminum paste is similar to the single-sided PERC aluminum paste in components, and mainly comprises aluminum powder, an inorganic binder, an organic binder and an auxiliary agent. Wherein the granularity of the aluminum powder is below 10 mu m and is spherical, the activity of the aluminum powder is more than 99.0 percent, a layer of aluminum oxide is always covered on the surface of the aluminum powder, and the thickness of the aluminum oxide influences the activity of the aluminum powder. The glass powder plays a role in fluxing in the aluminum paste and bonding among aluminum powder particles after sintering.
The organic binder of the aluminum paste is used as a carrier between aluminum powder and glass powder in the aluminum paste and is gradually volatilized, decomposed and removed in the high-temperature sintering process. The organic adhesive is prepared by dissolving high molecular polymer in an organic solvent under a certain temperature condition. The double-sided PERC printed aluminum grid line has higher printing requirements than a single-sided PERC battery, and requires that an organic carrier of the double-sided PERC battery has proper viscosity and gradient volatility, and also requires good thixotropy to meet the requirement of back molding of the double-sided PERC solar battery, so that the organic carrier used by the single-sided PERC battery cannot completely meet the requirements, and the organic carrier needs to be improved.
The existing single-sided PERC aluminum paste has no double-sided rate index, so the requirement on the thixotropic performance of the paste is low, the double-sided PERC battery requires that an aluminum back field is densely planted with fine grids as a positive silver electrode, the requirement on continuous printing stability is met, higher requirements are provided for grid lines, namely the grid lines are fine and good in appearance, the requirements on conductive paste are easy to pass through a net, the leveling property is good, the aspect ratio is large, and the requirement on the rheological performance of the paste is special.
Most of the prior double-sided aluminum pastes are easy to have the problems of printing missing, virtual printing, uneven thickness, paste leakage, plate sticking, too wide line width and the like in printing, except for researching the influence of factors such as a printing process, screen parameters and the like on the problems, wherein the printing performance of the aluminum paste is also the main reason for the phenomena, and the more important reason in the aluminum paste is an organic carrier except for a solid component aluminum powder.
The organic carrier is used as a carrier of aluminum powder and glass powder in the double-sided PERC aluminum paste and gradually volatilizes, burns and decomposes in the high-temperature sintering process. It is made up by using high-molecular polymer and dissolving it in organic solvent at a certain temp. The double-sided PERC aluminum paste can keep good uniformity and stability in the storage process, and has no conductive particle agglomeration and no sedimentation; in turn, can exhibit good rheology, thixotropy and stable viscosity during screen printing. These important properties are determined by the quality of the organic vehicle. At present, ethyl cellulose is adopted as a high molecular polymer in an organic carrier in the mainstream in the market, and the organic carrier prepared from the ethyl cellulose has good dispersion wetting capacity on aluminum powder and glass powder and shows good fluidity in the preparation process of the aluminum paste, but the defects that the double-sided PERC aluminum paste prepared from the ethyl cellulose in the storage process has poor viscosity stability and very large viscosity amplitude, is not beneficial to the use of the double-sided PERC aluminum paste at a client, and in addition, the prepared aluminum paste has poor thixotropy, the width of a printed aluminum grid line is wide, and the double-sided rate is not up to the standard easily.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides an organic vehicle for aluminum paste on the back surface of a double-sided PERC solar cell and a preparation method thereof. The organic carrier adopts a composite system of organic resin, improves the thixotropic property of the organic carrier, reduces the line width, improves the back rate of the double-sided battery, has proper viscosity, has stronger dispersion wetting capacity on aluminum powder, and can keep the stability of the viscosity of aluminum paste.
In order to achieve the purpose, the invention adopts the technical scheme that: an organic carrier for aluminum paste on the back of a double-sided PERC solar cell comprises the following raw materials in percentage by mass: 30-60% of organic resin and 40-70% of organic solvent.
According to the organic carrier for the aluminum paste on the back of the double-sided PERC solar cell, disclosed by the invention, a composite system of organic resin is adopted, and the organic resin and an organic solvent are compounded according to the proportion, so that on one hand, the organic carrier system has proper viscosity, the uniformity and compactness of a film layer after the aluminum grid line is sintered after screen printing are ensured, and the organic carrier can have stronger dispersion wetting capacity on the aluminum paste main body aluminum powder on the back of the double-sided PERC solar cell, and can keep the stability of the viscosity of the aluminum paste; on the other hand, the thixotropic property of the organic carrier is improved, the line width is reduced, the back rate of the double-sided battery is increased, and meanwhile, the continuous printing capability is ensured, namely, the phenomena of printing missing, virtual printing, uneven thickness, slurry leakage and the like cannot occur.
As a preferred embodiment of the present invention, the organic vehicle comprises the following raw materials by mass: 50% of organic resin and 50% of organic solvent.
In a preferred embodiment of the present invention, the organic resin is a cellulose acetate butyrate-modified resin.
The invention selects the cellulose acetate butyrate modified resin, and mainly has the following advantages: the wetting and dispersing capability of the aluminum paste main body aluminum powder on the back of the double-sided PERC solar cell is strong, the leveling property of the paste is improved in the paste application process, the lapping performance is good, and the linear aspect ratio after printing is good. The aluminum paste can accelerate the release of the solvent from the aluminum paste, increase the adhesion among aluminum particles, reduce the problem of friction and powder falling during the transmission of the battery piece on a belt, and has less residue after being fully heated and decomposed, and simultaneously can slow down the sedimentation of the paste and improve the storage stability of the paste due to good thixotropic property.
In a preferred embodiment of the present invention, the organic solvent is at least two selected from the group consisting of butyl carbitol, butyl carbitol acetate, diethylene glycol monomethyl ether, alcohol ester dodeca, and terpineol.
The invention also claims a preparation method of the organic carrier for the back aluminum paste of the double-sided PERC solar cell, which comprises the following steps:
and (3) placing the organic solvent and the organic resin in a container, and stirring for 10-20 minutes to fully mix the organic solvent and the organic resin, so as to obtain the organic carrier for the back aluminum paste of the double-sided PERC solar cell.
The preparation method of the organic carrier for the aluminum paste on the back of the double-sided PERC solar cell is directly stirring, does not need heating, is simple and convenient compared with a carrier taking ethyl cellulose as main resin, has low energy consumption, and does not have the phenomenon of incomplete resin dissolution.
Compared with the prior art, the invention has the beneficial effects that: according to the organic carrier for the aluminum paste on the back of the double-sided PERC solar cell, disclosed by the invention, a composite system of organic resin is adopted, and the organic resin and an organic solvent are compounded according to the proportion, so that on one hand, the organic carrier system has proper viscosity, the uniformity and compactness of a film layer after the aluminum grid line is sintered after screen printing are ensured, and the organic carrier can have stronger dispersion wetting capacity on the aluminum paste main body aluminum powder on the back of the double-sided PERC solar cell, and can keep the stability of the viscosity of the aluminum paste prepared by the organic carrier; on the other hand, the thixotropic property of the organic carrier is improved, the line width is reduced, the back rate of the double-sided battery is increased, and meanwhile, the continuous printing capability is ensured, namely, the phenomena of printing missing, virtual printing, uneven thickness, slurry leakage and the like cannot occur.
Drawings
FIG. 1 is a graph comparing the viscosity performance of the aluminum pastes for the back side of the dual-sided PERC solar cell prepared by the organic vehicle prepared in example 1 and comparative example 2 within 30 days;
FIG. 2 is a comparison graph of the adhesion of the aluminum pastes on the back of the double-sided PERC solar cell prepared by the organic vehicle prepared in example 1 and comparative example 2 after being dried at 300 ℃ and 350 ℃;
fig. 3 is a graph comparing the adhesion of the aluminum pastes on the back surfaces of the double-sided PERC solar cells prepared by the organic vehicle prepared in example 1 and comparative example 2 after sintering.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 50% of cellulose acetate butyrate modified resin and 50% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following steps:
and (3) placing the organic solvent and the cellulose acetate butyrate modified resin in a container, and stirring for 10-20 minutes to fully mix the organic solvent and the cellulose acetate butyrate, thereby obtaining the organic carrier for the back aluminum paste of the double-sided PERC solar cell.
Example 2
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 30% of cellulose acetate butyrate modified resin and 70% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Example 3
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 40% of cellulose acetate butyrate modified resin and 60% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Example 4
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 60% of cellulose acetate butyrate modified resin and 40% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Example 5
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 60% of cellulose acetate butyrate modified resin and 40% of terpineol;
the preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Example 6
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 60% of cellulose acetate butyrate modified resin and 40% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 30% of butyl carbitol acetate and 60% of diethylene glycol monomethyl ether.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Comparative example 1
The organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 50% ethyl cellulose, 50% organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following steps:
and (3) placing an organic solvent and ethyl cellulose in a container, and stirring for 10-20 minutes to fully mix the organic solvent and cellulose acetate butyrate to obtain the organic carrier for the back side aluminum paste of the double-sided PERC solar cell.
Comparative example 2
The organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 20% of ethyl cellulose and 80% of an organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of comparative example 1.
Comparative example 3
The organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 20% of cellulose acetate butyrate modified resin and 80% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Comparative example 4
The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell comprises the following raw materials in percentage by mass: 70% of cellulose acetate butyrate modified resin and 30% of organic solvent; the organic solvent comprises the following components in percentage by mass: 10% of butyl carbitol, 20% of butyl carbitol acetate, 20% of diethylene glycol monomethyl ether, 10% of alcohol ester dodeca and 40% of terpineol.
The preparation method of the organic carrier for the aluminum paste on the back surface of the double-sided PERC solar cell is the same as that of the embodiment 1.
Test example 1
The preparation method of the double-sided PERC solar cell back aluminum paste comprises the following steps:
uniformly mixing aluminum powder and an organic carrier, and rolling for 5 times by using a three-roll grinder to obtain double-sided PERC solar cell back aluminum paste; the organic vehicle is one of the organic vehicles prepared in examples 1-6 and comparative examples 1-4.
TABLE 1 Performance results for organic vehicle formulated double sided PERC solar cell backside aluminum pastes prepared in examples 1-6, comparative examples 1-4
From the figure 1, the EC system is the double-sided PERC solar cell back aluminum paste containing the organic carrier described in the comparative example 2, and the CAB system is the double-sided PERC solar cell back aluminum paste containing the organic carrier described in the example 1, and it can be seen from the figure that the viscosity stability of the CAB system is better than that of the EC system, which shows that the cellulose acetate butyrate modified resin is beneficial to improving the viscosity stability of the aluminum paste, and the sedimentation phenomenon is not easy to occur after long-time storage.
Analyzing examples 1-4 and comparative example 3, the lower proportion of cellulose acetate butyrate modified resin in CAB system results in lower viscosity of aluminum paste, so the thixotropy of aluminum paste is relatively poor, and the line width of aluminum grid line after printing and sintering is relatively large.
According to the analysis examples 1-4 and the comparative example 4, the cellulose acetate butyrate modified resin in the CAB system is too high, so that the viscosity of the aluminum paste is very high, the grid breaking phenomenon is easy to occur in printing, and the continuous printing is not facilitated.
Embodiment 5, the solvent system is changed in the CAB system, the viscosity of the aluminum paste is greatly affected, wherein terpineol is completely used for dissolving, the viscosity of the aluminum paste is high, the printing performance is poor, the grid breaking phenomenon is easy to occur, and the requirement of the printing performance cannot be met.
Example 2
The experimental example explores the adhesion of the aluminum paste on the back of the double-sided PERC solar cell prepared in example 1 and comparative example 2 after drying or sintering.
The EC system in fig. 2 is the back aluminum paste of the double-sided PERC solar cell containing the organic vehicle described in comparative example 2, and the CAB system in the figure is the back aluminum paste of the double-sided PERC solar cell containing the organic vehicle described in example 1. As can be seen from the figure, no matter the drying is carried out at 300 ℃ and 350 ℃, the phenomenon of aluminum powder falling after the CAB system aluminum paste is dried is obviously less, and the organic carrier prepared from the cellulose acetate butyrate modified resin is favorable for improving the adhesive force of the aluminum paste after the aluminum paste is dried.
The EC system in fig. 3 is the double-sided PERC solar cell back aluminum paste containing the organic vehicle described in comparative example 2, and the CAB system in the figure is the double-sided PERC solar cell back aluminum paste containing the organic vehicle described in example 1. As can be seen from the figure, after sintering, no aluminum powder falling phenomenon occurs after the CAB system aluminum paste is sintered, which shows that the organic carrier prepared from the cellulose acetate butyrate modified resin is beneficial to improving the adhesive force of the aluminum paste after sintering.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The organic carrier for the aluminum paste on the back of the double-sided PERC solar cell is characterized by comprising the following raw materials in percentage by mass: 30-60% of organic resin and 40-70% of organic solvent.
2. The organic vehicle for the aluminum paste on the back surface of the double-sided PERC solar cell as claimed in claim 1, wherein the organic vehicle comprises the following raw materials in percentage by mass: 50% of organic resin and 50% of organic solvent.
3. The organic vehicle for aluminum pastes on the back surfaces of double-sided PERC solar cells according to claim 1, wherein said organic resin is a cellulose acetate butyrate-modified resin.
4. The organic vehicle for aluminum paste on the back surface of a double-sided PERC solar cell as claimed in claim 1, wherein the organic solvent is at least two of butyl carbitol, butyl carbitol acetate, diethylene glycol monomethyl ether, alcohol ester dodeca and terpineol.
5. The method of preparing the organic vehicle for aluminum paste on the back surface of the double-sided PERC solar cell as claimed in claim 1, comprising the steps of:
and (3) placing the organic solvent and the organic resin in a container, and stirring for 10-20 minutes to fully mix the organic solvent and the organic resin, so as to obtain the organic carrier for the back aluminum paste of the double-sided PERC solar cell.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116031013A (en) * | 2023-01-10 | 2023-04-28 | 广州市儒兴科技股份有限公司 | Organic carrier for aluminum paste on back surface of double-sided PERC battery, aluminum paste and preparation method |
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