CN116618675A - Preparation method of low-temperature sintering silver powder for heterojunction solar cell - Google Patents
Preparation method of low-temperature sintering silver powder for heterojunction solar cell Download PDFInfo
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- CN116618675A CN116618675A CN202310619172.6A CN202310619172A CN116618675A CN 116618675 A CN116618675 A CN 116618675A CN 202310619172 A CN202310619172 A CN 202310619172A CN 116618675 A CN116618675 A CN 116618675A
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000009766 low-temperature sintering Methods 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007864 aqueous solution Substances 0.000 claims abstract description 41
- 239000002245 particle Substances 0.000 claims abstract description 37
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000002378 acidificating effect Effects 0.000 claims abstract description 10
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 14
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- ZNBNBTIDJSKEAM-UHFFFAOYSA-N 4-[7-hydroxy-2-[5-[5-[6-hydroxy-6-(hydroxymethyl)-3,5-dimethyloxan-2-yl]-3-methyloxolan-2-yl]-5-methyloxolan-2-yl]-2,8-dimethyl-1,10-dioxaspiro[4.5]decan-9-yl]-2-methyl-3-propanoyloxypentanoic acid Chemical compound C1C(O)C(C)C(C(C)C(OC(=O)CC)C(C)C(O)=O)OC11OC(C)(C2OC(C)(CC2)C2C(CC(O2)C2C(CC(C)C(O)(CO)O2)C)C)CC1 ZNBNBTIDJSKEAM-UHFFFAOYSA-N 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- 229910000378 hydroxylammonium sulfate Inorganic materials 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 abstract description 24
- 239000004332 silver Substances 0.000 abstract description 24
- 239000000843 powder Substances 0.000 abstract description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- -1 silver ions Chemical class 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920006316 polyvinylpyrrolidine Polymers 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
- B22F1/056—Submicron particles having a size above 100 nm up to 300 nm
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The application provides a preparation method of low-temperature sintering silver powder for a heterojunction solar cell, which comprises the steps of preparing silver nitrate aqueous solution, and adding nitric acid to adjust the pH value to be 1-2; preparing an acidic reducing agent aqueous solution and a dispersing agent aqueous solution; uniformly mixing silver nitrate aqueous solution, dispersing agent aqueous solution and acidic reducing agent aqueous solution to prepare mixed solution, and spraying alkaline aqueous solution into the mixed solution to obtain silver powder particles, wherein the average particle size of the silver powder particles is 100-300 nm. The nano silver powder obtained by the manufacturing method can be used as low-temperature sintered silver paste of heterojunction solar cells. The method has the advantages of simple process, easy control of the grain diameter of the silver powder, excellent mass production and great industrial value.
Description
Technical Field
The application belongs to the field of materialogy, relates to a new material of nano silver powder, and particularly relates to a preparation method of low-temperature sintered silver powder for a heterojunction solar cell.
Background
Silver is the metal with the best electrical and thermal conductivity. The electronic grade silver powder prepared by a chemical or physical method is known as a 21 st century functional material, has very stable physical and chemical characteristics, has very excellent performances in various aspects such as electricity, optics and catalysis, and is widely applied to various fields such as electronic paste industry, solar photovoltaic cells, integrated circuits, flexible display screens and the like. Silver powder is used as conductive filler, is an important component of conductive silver paste, is a key material for determining the performance of the conductive silver paste, and is a noble metal powder material which is most widely used at present and has the greatest dosage.
Heterojunction (HJT) solar cell technology has begun to be mass produced in large scale as the next generation solar cell core technology. The new production line of Tongwei and Xuesheng in 2020 brings the heterojunction battery productivity from MW level to GW level, and the 10GW heterojunction battery production base is internationally built by Jun stone energy and mountain coal in 2021, which marks that the heterojunction solar battery enters a large productivity stage and brings a great step to large-scale commercialization. The new heterojunction cell market permeability of 2025 is expected to be improved from 3.5% to 45% in 2020, and becomes the main stream technology of the solar cell market. The industry is well known that light Fu Gaowen silver paste adopts 1-3um spherical silver powder since 2010, and the silver powder is partially melted in the sintering process to form a silver electrode with high density and low bulk resistance. However, the electrode forming temperature in the solar heterojunction battery process is required to be lower than 250 ℃, the 1-3 mu m spherical silver powder cannot meet the sintering requirement in the low-temperature process, and the superfine silver powder with the average particle size of 100-300 nanometers is required to be newly selected. Ultrafine silver powder is a core key point of a heterojunction battery low-temperature silver paste technology.
Several relevant production technical literature is currently disclosed, however, these studies are temporarily carried out only by experiments, and the reaction conditions cannot be converted into industrial scale production. For example, li and Al (J.Am.chem.Soc.127, 10 th, 2005) present synthetic routes, and this reaction cannot be industrially applied to two major drawbacks. First, the use of nitrogen-containing reducing agents is a nuisance for possible electronic applications of the obtained nanoparticles, since traces of nitrogen are always present, which is detrimental to the quality of the obtained electronic devices. And secondly, the silver powder has more surface wrappers, low product concentration and poor low-temperature sintering performance, and is not suitable for low-temperature silver paste application. The Chinese patent with publication No. CN 113399678A discloses a preparation method of low-cost high-dispersion superfine silver powder, which has the publication No. CN 113399678A, 9 months and 17 days in 2021, but has the defects of complex production process and long production time, and is not suitable for industrial production. In addition, the silver powder is produced by grinding and dispersing by a ball mill, and the obtained silver powder has wide particle size distribution, and the superfine silver powder with single particle size of 100-500 nm and average particle size of 0.3-1.0 mu m has poor low-temperature sintering performance.
It is therefore an object of the present application to propose a synthesis route for nano-silver particles which is easy to industrialize and with which the size and shape of these particles can be well controlled.
Disclosure of Invention
The application provides a preparation method of low-temperature sintering silver powder for a heterojunction solar cell, which aims to solve the technical problem that silver powder prepared by the method in the prior art is poor in low-temperature sintering performance.
The application provides a preparation method of low-temperature sintering silver powder for a heterojunction solar cell, which comprises the following steps:
1) Preparing a silver nitrate aqueous solution, wherein the mass percentage concentration of the silver nitrate aqueous solution is 2-40%, and adding nitric acid to adjust the pH value to be 1-2;
2) Preparing a reducing agent aqueous solution, wherein the reducing agent aqueous solution is acidic and has a pH value of less than 6.5; the mass percentage concentration of the aqueous solution of the reducing agent is 1-38%;
3) Preparing a dispersant aqueous solution, wherein the mass percentage concentration of the dispersant aqueous solution is 1-50%;
4) Uniformly mixing silver nitrate aqueous solution with dispersant solution and acidic reducer aqueous solution in sequence to prepare mixed solution; the dosage of the dispersing agent is 10-40% of the mass of silver nitrate in the silver nitrate aqueous solution; the mass ratio of the silver nitrate to the acidic reducing agent is 100:10-200 parts;
5) Heating and preserving the temperature of the mixed solution to 20-80 ℃, and then spraying and adding an alkaline aqueous solution into the mixed solution to obtain silver powder particles, wherein the average particle size of the silver powder particles is 100-300 nm.
Further, the reducing agent is preferably any one or the combination of more than two of formaldehyde, ascorbic acid and hydroxylamine sulfate in any proportion.
Further, the dispersant is preferably polyvinylpyrrolidone, and the alkaline aqueous solution is preferably any one or a combination of two or more of ammonia water, sodium carbonate, sodium hydroxide and potassium hydroxide in any proportion.
Further, in the mixing of the silver nitrate aqueous solution, the dispersant solution and the reducing agent aqueous solution, the three solutions were sequentially and individually supplied to a reaction vessel, and mixed by a stirrer disposed in the vessel.
Further, the alkaline aqueous solution is added for less than 30 seconds.
The silver powder obtained in the present application has an average particle diameter of 100 to 300nm as observed by a scanning electron microscope, and a relative standard deviation (standard deviation σ/average particle diameter d) of the particle diameter is 0.3 or less, more preferably 0.25 or less.
The present application provides a manufacturing method capable of manufacturing silver powder having a particle size of 100-300nm with high productivity. The present application has been made in order to achieve the above object, and has found that a silver nitrate aqueous solution and an acidic reducing agent aqueous solution are uniformly mixed in advance under specific conditions, and that oxidation-reduction reaction cannot occur under acidic conditions. Then changing the reaction condition to be alkaline, so that the reduction reaction rapidly occurs, and obtaining a large number of silver particles with uniform particle size. The method realizes the breakthrough of the technology for industrially producing the superfine silver powder.
The present application provides a process for preparing a reaction precursor solution comprising silver particles by mixing a solution containing silver ions (aqueous silver nitrate solution) and a solution containing a reducing agent (aqueous formaldehyde, ascorbic acid and hydroxylamine sulfate solution) with a dispersing agent; and a particle growth step of injecting an alkaline aqueous solution into the reaction precursor liquid at a certain temperature by rapid injection, and adjusting the pH value of the reaction precursor liquid to promote the reduction of silver ions in the reaction precursor liquid so as to grow silver particles.
Compared with the prior art, the application has the technical effects of being positive and obvious. According to the method for manufacturing silver powder, 100-300nm silver powder with uniform particle size can be obtained. Therefore, the silver paste can be used in low-temperature sintering silver paste of heterojunction solar cells. The silver powder production method of the application is easy to control the particle size of the silver powder, has excellent mass productivity and has great industrial value.
Drawings
Fig. 1 is a scanning electron microscope (sem) image of silver particles obtained by the method according to the application obtained by Transmission Electron Microscopy (TEM).
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples. Unless otherwise indicated, all starting materials in the examples of the present application were purchased commercially.
Example 1
1) Preparing a liquid silver nitrate solution A: 500 g of silver nitrate is dissolved in 10Kg of deionized water under stirring, and concentrated nitric acid is added to adjust the pH value to 2.0, so as to prepare silver nitrate solution A.
Dispersant solution B: 150 g of dispersing agent polyvinylpyrrolidone K30 is dissolved in 1500 g of deionized water at 60 ℃ and stirred for dissolution to prepare a dispersing agent solution B.
Wherein the dispersant is used in an amount of 0.3 times the mass of silver nitrate in solution A. PVP acts as a nucleating agent and stabilizer to allow the formation of silver nanoparticles while avoiding their aggregation.
Reducing agent solution C: 300 g of formaldehyde aqueous solution (mass percentage: 37%) is dissolved in 2700 g of deionized water and stirred for dissolution, so as to prepare formaldehyde solution C with mass percentage concentration: 3.7%.
2) Silver powder production
Solution A, B and solution C were added sequentially to an 80L glass reactor (stirring on 500 rpm) at a flow rate of 2.5L/min and heated to 60℃at which time the solution was clear and transparent and no redox reaction occurred. Then, an ammonia water solution (the mass percentage concentration of the ammonia water is 26%) is quickly injected within 8 seconds, and the PH value of the reaction precursor liquid is adjusted to 6.5, so that the reduction of silver ions in the reaction precursor liquid is promoted to quickly produce silver particles. After the ammonia water is injected, the reaction starts, the transparent reaction solution turns grey black firstly, and finally the solution turns brown, and the stirring is continued for 30 minutes at a high speed. And finally, carrying out solid-liquid separation and cleaning to obtain the silver powder in a wet state.
As shown in fig. 1, it can be observed from the SEM image that the silver powder prepared is of a spheroid-like single crystal structure, and the size of silver particles and their distribution can be measured using the image. The size of the silver particles obtained is 33 to 210nm. The average particle diameter (D50) of the silver particles was measured by a nanosize analyzer, and found to be 127.5nm.
Subsequently, 60g of the recovered microparticles in a wet state were dried at room temperature for 24 hours under a nitrogen atmosphere to remove moisture. And then mixing and defoaming silver powder, butyl methacrylate and butyl carbitol by a three-roll mill to prepare the silver particle mixed material. The silver fine particles thus obtained were kneaded and coated on a glass substrate using a metal mask under conditions such that the side length was 10mm square and the thickness was 30. Mu.m, and then sintered at 170℃for 20 minutes using a heated air circulation dryer to form a silver conductive film on the glass substrate. The specific resistance value of the silver conductive film was calculated to be 3.3. Mu. Ω. Cm based on the surface resistance measured by the surface resistance measuring device and the film thickness measured by the film thickness measuring device.
The present application therefore proposes a process for preparing silver particles having an average particle diameter of 100-300nm, with which these particles can be obtained and their size and shape can be well controlled. The choice of silver nitrate, formaldehyde and polyvinylpyrrolidone has the best combination in terms of yield, quality of the resulting particles, cost of reagents, safety of the reaction.
Claims (5)
1. The preparation method of the low-temperature sintering silver powder for the heterojunction solar cell is characterized by comprising the following steps of:
1) Preparing a silver nitrate aqueous solution, wherein the mass percentage concentration of the silver nitrate aqueous solution is 2-40%, and adding nitric acid to adjust the pH value to be 1-2;
2) Preparing a reducing agent aqueous solution, wherein the reducing agent aqueous solution is acidic and has a pH value of less than 6.5; the mass percentage concentration of the aqueous solution of the reducing agent is 1-38%;
3) Preparing a dispersant aqueous solution, wherein the mass percentage concentration of the dispersant aqueous solution is 1-50%;
4) Uniformly mixing silver nitrate aqueous solution with dispersant solution and acidic reducer aqueous solution in sequence to prepare mixed solution; the dosage of the dispersing agent is 10-40% of the mass of silver nitrate in the silver nitrate aqueous solution; the mass ratio of the silver nitrate to the acidic reducing agent is 100:10-200 parts;
5) Heating and preserving the temperature of the mixed solution to 20-80 ℃, and then spraying and adding an alkaline aqueous solution into the mixed solution to obtain silver powder particles, wherein the average particle size of the silver powder particles is 100-300 nm.
2. The method for preparing the low-temperature sintered silver powder for the heterojunction solar cell, which is disclosed in claim 1, is characterized in that the reducing agent is preferably any one or the combination of more than two of formaldehyde, ascorbic acid and hydroxylamine sulfate in any proportion.
3. The method for preparing the low-temperature sintered silver powder for the heterojunction solar cell, as claimed in claim 1, wherein the dispersing agent is preferably polyvinylpyrrolidone; the alkaline aqueous solution is preferably any one or the combination of more than two of ammonia water, sodium carbonate, sodium hydroxide and potassium hydroxide in any proportion.
4. The method for producing a low-temperature sintered silver powder for a heterojunction solar cell according to claim 1, wherein in the mixing of the silver nitrate aqueous solution, the dispersant solution and the reducing agent aqueous solution, the three solutions are sequentially and respectively supplied to a reaction kettle, and mixed by a stirrer disposed in the kettle.
5. The method for preparing the low-temperature sintered silver powder for the heterojunction solar cell as claimed in claim 1, wherein the addition time of the alkaline aqueous solution is less than 30 seconds.
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| CN202310619172.6A CN116618675A (en) | 2023-05-30 | 2023-05-30 | Preparation method of low-temperature sintering silver powder for heterojunction solar cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117300138A (en) * | 2023-10-07 | 2023-12-29 | 上海银波生物科技有限公司 | Preparation method of superfine silver powder for low-temperature silver paste |
| CN117300145A (en) * | 2023-09-21 | 2023-12-29 | 上海银波生物科技有限公司 | Preparation method of monocrystal-like silver powder with ultrahigh tap density |
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| CN1785558A (en) * | 2005-11-21 | 2006-06-14 | 东南大学 | Preparation method of micron grade ball shape silver powder for conductive silver paste |
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