CN115411148B - Preparation method of solar cell electrode - Google Patents
Preparation method of solar cell electrode Download PDFInfo
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- CN115411148B CN115411148B CN202211178442.6A CN202211178442A CN115411148B CN 115411148 B CN115411148 B CN 115411148B CN 202211178442 A CN202211178442 A CN 202211178442A CN 115411148 B CN115411148 B CN 115411148B
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 172
- 239000002184 metal Substances 0.000 claims abstract description 172
- 239000000843 powder Substances 0.000 claims abstract description 64
- 239000002904 solvent Substances 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 238000007650 screen-printing Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002243 precursor Substances 0.000 claims abstract description 7
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- 230000001502 supplementing effect Effects 0.000 claims abstract description 4
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- 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
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- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 6
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- 229920000180 alkyd Polymers 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- IMUDHTPIFIBORV-UHFFFAOYSA-N aminoethylpiperazine Chemical compound NCCN1CCNCC1 IMUDHTPIFIBORV-UHFFFAOYSA-N 0.000 claims description 6
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- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 claims description 6
- VANNPISTIUFMLH-UHFFFAOYSA-N glutaric anhydride Chemical compound O=C1CCCC(=O)O1 VANNPISTIUFMLH-UHFFFAOYSA-N 0.000 claims description 6
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 6
- 229920000609 methyl cellulose Polymers 0.000 claims description 6
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- ZETYUTMSJWMKNQ-UHFFFAOYSA-N n,n',n'-trimethylhexane-1,6-diamine Chemical compound CNCCCCCCN(C)C ZETYUTMSJWMKNQ-UHFFFAOYSA-N 0.000 claims description 6
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 229920005862 polyol Polymers 0.000 claims description 6
- 150000003077 polyols Chemical class 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 6
- OHBRHBQMHLEELN-UHFFFAOYSA-N acetic acid;1-butoxybutane Chemical compound CC(O)=O.CCCCOCCCC OHBRHBQMHLEELN-UHFFFAOYSA-N 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 4
- 235000010944 ethyl methyl cellulose Nutrition 0.000 claims description 4
- 229920003087 methylethyl cellulose Polymers 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 description 30
- 239000004332 silver Substances 0.000 description 30
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 229920001249 ethyl cellulose Polymers 0.000 description 2
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
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- 238000005245 sintering Methods 0.000 description 1
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Classifications
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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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Conductive Materials (AREA)
Abstract
The invention provides a preparation method of a solar cell electrode, which comprises the following steps: mixing spherical metal powder and a first solvent to obtain first metal slurry; mixing the flaky metal powder with a second solvent to obtain second metal paste; mixing part of the first metal paste and the second metal paste to obtain low-temperature metal paste; and preparing an electrode on a solar cell precursor by screen printing the low-temperature metal paste, and supplementing the rest first metal paste to the low-temperature metal paste when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced in the process of preparing the electrode. The invention can improve the printability of the low-temperature metal paste and the electrical conductivity of the electrode formed by the low-temperature metal paste.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a preparation method of a solar cell electrode.
Background
Solar cells, such as heterojunction solar cells, also known as HJT cells (Hereto-junction WITH INTRINSIC THIN-layer), are known as the most promising solar cells after emitter and back Passivation (PERC) cells. At present, the preparation method of the heterojunction solar cell electrode still extends to the traditional preparation method of the PERC cell electrode, namely screen printing. Because amorphous silicon or microcrystalline silicon in the heterojunction solar cell belongs to a metastable state structure, the amorphous silicon or microcrystalline silicon cannot bear a high-temperature sintering process, and high-temperature metal paste used by the PERC cell, such as high-temperature silver paste, cannot be directly used for the heterojunction solar cell, so that the electrode preparation of the heterojunction solar cell is limited. To address this problem, silver paste manufacturers have been working to develop low temperature silver pastes. In order to ensure excellent conductivity of the prepared electrode, the low-temperature silver paste generally contains spherical silver powder and plate-like silver powder.
However, since the plate-like silver powder is generally larger in size than the spherical silver powder and the plate-like silver powder is inferior in fluidity to the spherical silver powder, the ratio of the spherical silver powder to the plate-like silver powder in the remaining silver paste on the screen is changed during the screen printing (i.e., the ratio of the plate-like silver powder in the remaining low-temperature silver paste on the screen is increased in the later stage of printing), so that the printability of the remaining low-temperature silver paste is deteriorated. Meanwhile, as the proportion of the flake silver powder in the residual low-temperature silver paste is increased, after the low-temperature silver paste is solidified, the porosity of the silver electrode is increased, and the conductivity of the silver electrode is reduced.
Disclosure of Invention
Accordingly, there is a need for a method for producing a solar cell electrode capable of improving printability of low-temperature metal paste and electrode conductivity.
At least one embodiment of the invention provides a preparation method of a solar cell electrode, which comprises the following steps:
Mixing spherical metal powder and a first solvent to obtain first metal slurry;
mixing the flaky metal powder with a second solvent to obtain second metal paste;
mixing part of the first metal paste and the second metal paste to obtain low-temperature metal paste; and
And preparing an electrode on a solar cell precursor by using the low-temperature metal paste in a screen printing mode, and supplementing the rest first metal paste to the low-temperature metal paste when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced in the process of preparing the electrode.
In some of these embodiments, the spherical metal powder includes at least one of spherical silver powder, spherical copper powder, spherical gold powder, and spherical aluminum powder, and the flake metal powder includes at least one of flake silver powder, flake copper powder, flake gold powder, and flake aluminum powder.
In some of these embodiments, the determination of the imbalance in the ratio of the spherical metal powder to the flake metal powder in the cryogenic metal slurry is based on:
The printing speed of the screen printing is reduced; and/or
The conductivity of the electrode decreases.
In some of these embodiments, mixing a portion of the first metal paste and the second metal paste specifically includes:
Mixing part of the first metal paste and the second metal paste in a mass ratio of 1:3-1:2.
In some embodiments, the mixing the spherical metal powder and the first solvent to obtain the first metal paste specifically includes the following steps:
and mixing the spherical metal powder, the first binder, the first curing agent, the first dispersing agent, the first diluent and the first solvent to obtain the first metal paste.
In some embodiments, in the first metal paste, the mass fraction of the spherical metal powder is 85% -95%, the mass fraction of the first binder is 1% -4%, the mass fraction of the first curing agent is 1% -2%, the mass fraction of the first dispersing agent is 0% -1.5%, the mass fraction of the first diluent is 1% -3%, and the mass fraction of the first solvent is 1% -4.5%.
In some of these embodiments, the method of preparing further comprises at least one of the following (1) - (5):
(1) The first binder comprises a first organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin;
(2) The first curing agent comprises at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethyl piperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylolpropane and dicyanoethyl ethylenediamine;
(3) The first dispersing agent comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, fatty acid polyethylene glycol ester, methyl cellulose and ethyl cellulose;
(4) The first diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene;
(5) The first solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol diethyl ether acetate, alcohol ester twelve and trimethyl cyclohexenone.
In some embodiments, the mixing the flake metal powder and the second solvent to obtain the second metal paste specifically includes the following steps:
And mixing the flaky metal powder, a second binder, a second curing agent, a second dispersing agent, a second diluent and the second solvent to obtain the second metal paste.
In some embodiments, in the second metal paste, the mass fraction of the sheet metal powder is 85% -95%, the mass fraction of the second binder is 1% -4%, the mass fraction of the second curing agent is 1% -2%, the mass fraction of the second dispersing agent is 0% -1.5%, the mass fraction of the second diluent is 1% -3%, and the mass fraction of the second solvent is 1% -4.5%.
In some of these embodiments, the method of preparing further comprises at least one of the following (1) - (5):
(1) The second binder comprises a second organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin;
(2) The second curing agent comprises at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethyl piperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylolpropane and dicyanoethyl ethylenediamine;
(3) The second dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, fatty acid polyethylene glycol ester, methyl cellulose and ethyl cellulose;
(4) The second diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene;
(5) The second solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol diethyl ether acetate, alcohol ester twelve and trimethyl cyclohexenone.
According to the invention, the spherical metal powder and the first solvent are mixed to prepare the first metal paste, the flake metal powder and the second solvent are mixed to prepare the second metal paste, namely, the first metal paste and the second metal paste are prepared respectively by adopting a method of separate preparation, when the low-temperature metal paste is used, a user mixes the first metal paste and the second metal paste according to the requirement, so that the low-temperature metal paste can be obtained, and meanwhile, when the ratio of the spherical metal powder to the flake metal powder in the screen printing process of the low-temperature metal paste is changed, the first metal paste can be timely supplemented into the low-temperature metal paste, so that the spherical metal powder and the flake metal powder in the low-temperature metal paste are in a proper ratio, and therefore, the printability of the low-temperature metal paste is improved, the porosity of the electrode generated by the low-temperature metal paste is reduced, the conductivity of the electrode is improved, and the quality and the efficiency of a solar cell are further ensured. Meanwhile, the invention can conveniently adjust the proportion of the spherical metal powder and the flaky metal powder in the low-temperature metal paste, thereby providing great flexibility and stability of product quality for users.
Drawings
Fig. 1 is a flowchart of a preparation of a solar cell electrode provided by the invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, at least one embodiment of the invention provides a method for preparing a solar cell electrode, which includes the following steps:
step S11, mixing spherical metal powder and a first solvent to obtain first metal slurry.
Specifically, the spherical metal powder, the first binder, the first curing agent, the first dispersing agent, the first diluent and the first solvent are uniformly mixed to obtain the first metal paste. In the first metal paste, the mass fraction of the spherical metal powder is 85% -95%, the mass fraction of the first binder is 1% -4%, the mass fraction of the first curing agent is 1% -2%, the mass fraction of the first dispersing agent is 0% -1.5%, the mass fraction of the first diluent is 1% -3%, and the mass fraction of the first solvent is 1% -4.5%.
In one embodiment, the spherical metal powder includes at least one of spherical silver powder, spherical copper powder, spherical gold powder, and spherical aluminum powder. Preferably, the spherical metal powder is spherical silver powder.
In one embodiment, the first binder comprises a first organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin.
In one embodiment, the first curing agent includes at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylol propane, and dicyanoethyl ethylenediamine.
In one embodiment, the first dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol esters of fatty acids, methylcellulose, and ethylcellulose.
In one embodiment, the first diluent comprises at least one of a glycidyl ether, a polyol, a glycidyl ester, an acetate, and styrene.
In one embodiment, the first solvent comprises at least one of butyl diethanol, butyl triethanol, butyl diethanol acetate, diethyl ether acetate, alcohol ester twelve, and trimethylcyclohexenone.
And step S12, mixing the flaky metal powder with a second solvent to obtain second metal slurry.
Specifically, the sheet metal powder, a second binder, a second curing agent, a second dispersing agent, a second diluent and the second solvent are uniformly mixed to obtain the second metal paste. Wherein in the second metal paste, the mass fraction of the sheet metal powder is 85% -95%, the mass fraction of the second binder is 1% -4%, the mass fraction of the second curing agent is 1% -2%, the mass fraction of the second dispersing agent is 0% -1.5%, the mass fraction of the second diluent is 1% -3%, and the mass fraction of the second solvent is 1% -4.5%.
In an embodiment, the flake metal powder is any one of flake silver powder, flake copper powder, flake gold powder, and flake aluminum powder. Preferably, the plate-shaped metal powder is plate-shaped silver powder.
In one embodiment, the second binder comprises a second organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin nitro.
In one embodiment, the second curing agent includes at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylol propane, and dicyanoethyl ethylenediamine.
In one embodiment, the second dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol esters of fatty acids, methylcellulose, and ethylcellulose.
In one embodiment, the second diluent comprises at least one of a glycidyl ether, a polyol, a glycidyl ester, an acetate, and styrene.
In one embodiment, the second solvent comprises at least one of butyl diethanol, butyl triethanol, butyl diethanol acetate, diethyl ether acetate, alcohol ester twelve, and trimethylcyclohexenone.
And step S13, mixing part of the first metal paste and the second metal paste to obtain low-temperature metal paste.
Specifically, part of the first metal paste and the second metal paste are uniformly mixed in a mass ratio of 1:3-1:2, so that the low-temperature metal paste is obtained.
And S14, preparing an electrode on a solar cell precursor by using the low-temperature metal paste in a screen printing mode, and supplementing the rest first metal paste into the low-temperature metal paste when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced in the process of preparing the electrode.
It will be appreciated that the preparation of the electrode by screen printing requires that the low temperature metal paste be placed on a screen and transferred by squeegee extrusion through the mesh of the screen onto the solar cell precursor to prepare the electrode.
In the screen printing process, when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced (the printing performance and the printing quality of the low-temperature metal paste can be judged, namely, the printing speed of the screen printing is reduced or the conductivity of an electrode prepared from the low-temperature metal paste is reduced), the low-temperature metal paste on the screen plate is required to be poured out, a certain amount of the rest first metal paste is added into the poured low-temperature metal paste, and the mixture is uniformly stirred, so that the spherical metal powder and the flaky metal powder in the low-temperature silver paste are in a proper ratio, and then the low-temperature metal paste added with the first metal paste is continuously prepared into the electrode by the screen printing mode.
It will be appreciated that after screen printing, a curing step is also required to obtain the electrode.
In one embodiment, the solar cell of the present invention may be a heterojunction cell.
According to the invention, the spherical metal powder and the first solvent are mixed to prepare the first metal paste, the flake metal powder and the second solvent are mixed to prepare the second metal paste, namely, the first metal paste and the second metal paste are prepared respectively by adopting a method of separate preparation, when the low-temperature metal paste is used, a user mixes the first metal paste and the second metal paste according to the requirement, so that the low-temperature metal paste can be obtained, and meanwhile, when the ratio of the spherical metal powder to the flake metal powder in the screen printing process of the low-temperature metal paste is changed, the first metal paste can be timely supplemented into the low-temperature metal paste, so that the spherical metal powder and the flake metal powder in the low-temperature metal paste are in a proper ratio, and therefore, the printability of the low-temperature metal paste is improved, the porosity of the electrode generated by the low-temperature metal paste is reduced, the conductivity of the electrode is improved, and the quality and the efficiency of a solar cell are further ensured. Meanwhile, the invention can conveniently adjust the proportion of the spherical metal powder and the flaky metal powder in the low-temperature metal paste, thereby providing great flexibility and stability of product quality for users.
The invention is further illustrated by the following specific examples and comparative examples.
Example 1
(1) Uniformly mixing spherical silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethanol butyl ether to obtain first silver paste. Wherein, in the first silver paste, the mass fraction of the spherical silver powder is 90%, the mass fraction of the bisphenol A epoxy resin is 3%, the mass fraction of the dicyandiamide is 2%, the mass fraction of the polyacrylamide is 1%, the mass fraction of the glycidyl ether is 2%, and the mass fraction of the diethanol butyl ether is 2%.
(2) Uniformly mixing the flake silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethanol butyl ether to obtain second silver paste. Wherein in the second silver paste, the mass fraction of the flake silver powder is 90%, the mass fraction of the bisphenol A type epoxy resin is 3%, the mass fraction of the dicyandiamide is 2%, the mass fraction of the polyacrylamide is 1%, the mass fraction of the glycidyl ether is 2%, and the mass fraction of the diethanol butyl ether is 2%.
(3) And uniformly mixing part of the first silver paste and the second silver paste in a mass ratio of 1:3 to obtain the low-temperature silver paste.
(4) And preparing an electrode on the heterojunction solar cell precursor by using the low-temperature silver paste in a screen printing mode, pouring out the low-temperature silver paste on the screen printing plate when the printing speed of the screen printing is reduced in the process of preparing the electrode, adding a certain amount of the rest first silver paste into the poured low-temperature silver paste, uniformly stirring to ensure that spherical silver powder and flake silver powder in the low-temperature silver paste are in a proper proportion, and continuously preparing the electrode by using the low-temperature silver paste added with the first silver paste in the screen printing mode, thereby obtaining the heterojunction solar cell.
Comparative example 1
(1) Uniformly mixing spherical silver powder, flake silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethanol butyl ether to obtain low-temperature silver paste. Wherein, in the low-temperature silver paste, the mass fraction of the spherical silver powder, the mass fraction of the flake silver powder, the mass fraction of the bisphenol a epoxy resin, the mass fraction of the dicyandiamide, the mass fraction of the polyacrylamide, the mass fraction of the glycidyl ether and the mass fraction of the diethanol butyl ether are respectively equal to the mass fraction of the corresponding components in the low-temperature silver paste in the step (3) of the embodiment 1.
(2) And preparing an electrode on the heterojunction solar cell precursor by using the low-temperature silver paste in a screen printing mode, so as to obtain the heterojunction solar cell.
The conductivity of the electrode in the heterojunction solar cell prepared in example 1 and comparative example 1 and the efficiency of the heterojunction solar cell were respectively tested, and the test results showed that the conductivity of the electrode in the heterojunction solar cell prepared in example 1 was much greater than the conductivity of the electrode in the heterojunction solar cell prepared in comparative example 1, and the efficiency of the heterojunction solar cell prepared in example 1 was also much greater than the efficiency of the heterojunction solar cell prepared in comparative example 1.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The preparation method of the solar cell electrode is characterized by comprising the following steps of:
Mixing spherical metal powder and a first solvent to obtain first metal slurry;
mixing the flaky metal powder with a second solvent to obtain second metal paste;
mixing part of the first metal paste and the second metal paste to obtain low-temperature metal paste; and
And preparing an electrode on a solar cell precursor by using the low-temperature metal paste in a screen printing mode, and supplementing the rest first metal paste to the low-temperature metal paste when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced in the process of preparing the electrode.
2. The method of manufacturing a solar cell electrode according to claim 1, wherein the spherical metal powder comprises at least one of spherical silver powder, spherical copper powder, spherical gold powder, and spherical aluminum powder, and the plate-like metal powder comprises at least one of plate-like silver powder, plate-like copper powder, plate-like gold powder, and plate-like aluminum powder.
3. The method for manufacturing a solar cell electrode according to claim 1, wherein the determination of the imbalance in the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is based on:
The printing speed of the screen printing is reduced; and/or
The conductivity of the electrode decreases.
4. The method for producing a solar cell electrode according to claim 1, wherein mixing a part of the first metal paste and the second metal paste specifically comprises:
Mixing part of the first metal paste and the second metal paste in a mass ratio of 1:3-1:2.
5. The method for producing a solar cell electrode according to any one of claims 1 to 4, wherein the mixing of the spherical metal powder and the first solvent to obtain the first metal paste specifically comprises the steps of:
and mixing the spherical metal powder, the first binder, the first curing agent, the first dispersing agent, the first diluent and the first solvent to obtain the first metal paste.
6. The method of manufacturing a solar cell electrode according to claim 5, wherein in the first metal paste, the mass fraction of the spherical metal powder is 85% -95%, the mass fraction of the first binder is 1% -4%, the mass fraction of the first curing agent is 1% -2%, the mass fraction of the first dispersing agent is 0% -1.5%, the mass fraction of the first diluent is 1% -3%, and the mass fraction of the first solvent is 1% -4.5%.
7. The method for producing a solar cell electrode according to claim 6, further comprising at least one of the following (1) to (5):
(1) The first binder comprises a first organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin;
(2) The first curing agent comprises at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethyl piperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylolpropane and dicyanoethyl ethylenediamine;
(3) The first dispersing agent comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, fatty acid polyethylene glycol ester, methyl cellulose and ethyl cellulose;
(4) The first diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene;
(5) The first solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol diethyl ether acetate, alcohol ester twelve and trimethyl cyclohexenone.
8. The method for producing a solar cell electrode according to any one of claims 1 to 4, wherein the step of mixing the sheet metal powder with the second solvent to obtain the second metal paste specifically comprises the steps of:
And mixing the flaky metal powder, a second binder, a second curing agent, a second dispersing agent, a second diluent and the second solvent to obtain the second metal paste.
9. The method of manufacturing a solar cell electrode according to claim 8, wherein in the second metal paste, the mass fraction of the sheet metal powder is 85% -95%, the mass fraction of the second binder is 1% -4%, the mass fraction of the second curing agent is 1% -2%, the mass fraction of the second dispersing agent is 0% -1.5%, the mass fraction of the second diluent is 1% -3%, and the mass fraction of the second solvent is 1% -4.5%.
10. The method for producing a solar cell electrode according to claim 9, further comprising at least one of the following (1) to (5):
(1) The second binder comprises a second organic binder comprising at least one of bisphenol a type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin, and acrylate resin;
(2) The second curing agent comprises at least one of dicyandiamide, hexamethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethyl piperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkanolamine, trimethylolpropane and dicyanoethyl ethylenediamine;
(3) The second dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, fatty acid polyethylene glycol ester, methyl cellulose and ethyl cellulose;
(4) The second diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene;
(5) The second solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol diethyl ether acetate, alcohol ester twelve and trimethyl cyclohexenone.
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| CN202211178442.6A CN115411148B (en) | 2022-09-26 | 2022-09-26 | Preparation method of solar cell electrode |
| PCT/CN2023/091103 WO2024066335A1 (en) | 2022-09-26 | 2023-04-27 | Method for preparing electrode of solar cell |
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| CN118658653A (en) * | 2024-08-21 | 2024-09-17 | 西安宏星电子浆料科技股份有限公司 | Conductive silver paste, preparation method thereof and N-type TOPCon solar cell |
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| CN115411148B (en) * | 2022-09-26 | 2024-05-10 | 通威太阳能（成都）有限公司 | Preparation method of solar cell electrode |
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