CN103537708A - Hyperpure silver powder for solar cell conductive silver paste and preparing method of hyperpure silver powder - Google Patents
Hyperpure silver powder for solar cell conductive silver paste and preparing method of hyperpure silver powder Download PDFInfo
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- CN103537708A CN103537708A CN201310408019.5A CN201310408019A CN103537708A CN 103537708 A CN103537708 A CN 103537708A CN 201310408019 A CN201310408019 A CN 201310408019A CN 103537708 A CN103537708 A CN 103537708A
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 26
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 13
- 229960005070 ascorbic acid Drugs 0.000 claims abstract description 11
- 235000010323 ascorbic acid Nutrition 0.000 claims abstract description 11
- 239000011668 ascorbic acid Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 229910052709 silver Inorganic materials 0.000 claims abstract description 9
- 239000004332 silver Substances 0.000 claims abstract description 9
- 238000006722 reduction reaction Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 44
- 238000002360 preparation method Methods 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 14
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000000967 suction filtration Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000013019 agitation Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 108010010803 Gelatin Proteins 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229920000159 gelatin Polymers 0.000 claims description 3
- 239000008273 gelatin Substances 0.000 claims description 3
- 235000019322 gelatine Nutrition 0.000 claims description 3
- 235000011852 gelatine desserts Nutrition 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920000136 polysorbate Polymers 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 14
- 239000006185 dispersion Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- -1 pattern Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention relates to a hyperpure silver powder for solar cell conductive silver paste and a preparing method of the hyperpure silver powder. The preparing method comprises the steps that a mixed reaction solution A of silver nitrate and a dispersing agent and an ascorbic acid mixed reducing solution B are prepared; the solution A and the solution B are preheated at a constant temperature in a water bath kettle, the solution A and the solution B are stirred in a magnetic mode and then mixed for conducting reduction reaction; aftertreatment and a plasma process are conducted on obtained silver powder to obtain the hyperpure silver powder which meets the demand of the solar cell conductive silver paste. A plasma technology is applied so that the prepared silver powder is high in purity, the purity is larger than or equal to 99.99%, the ohmic contact of the silver powder and a silicon substrate can be facilitated when the silver paste is sintered, and a dense membrane is formed. Under the premises that the purity is improved and the characteristics of the silver powder are not changed, the prepared silver powder is made to have the average grain diameter of 0.1-5 micrometers, grain diameter distribution is narrow, dispersity is good, tap density is larger than or equal to 4.5g/cm<3>, and the photoelectric converting efficiency of solar cells can be better improved. A plasma aftertreatment process is simple, and mass production is facilitated.
Description
Technical field
The present invention relates to a kind of ultrapure silver powder and preparation method thereof, relate in particular to a kind of solar cell conductive silver slurry with ultrapure silver powder and preparation method thereof, belong to technical field of electronic materials.
Background technology
Along with the exhaustion of global resources and the deterioration of environment, following solar energy power technology and industry have very strong competitiveness.Solar cell manufacturing industry in the promotion Xia， various countries of international photovoltaic market great potential falls over each other to drop into huge fund, expanding production, and to strive one seat, China has become largest production and the exported country of silicon solar cell.
Silver powder, because good electric conductivity and application performance have become the important materials of Electrical and Electronic industry, is most widely used a kind of noble metal powder in electronics industry, is the basic function material of the electric slurries such as thick film, resistance, pottery, medium.And the conducting function phase that silver powder is starched as solar cell conductive silver, pattern, particle diameter, dispersiveness, tap density and purity have all determined the electrical property of slurry, and affect machinery and the physical property of sintered membrane, and then affect the electricity conversion of solar cell.
The preparation method of silver powder is varied, through the exploration discovery to prior art, current preparation method mainly be take chemical liquid phase reducing process as main, it be the most frequently used be also most important method, because technological process is simple and feasible, cost compared with low, production scale is large, in electronics industry, has obtained generally application.But along with reducing of silver-colored particle size, the weak interaction force such as the electrostatic attraction between particle, Van der Waals force, capillary force more and more highlights.In liquid phase reduction preparation process, the silver particles restoring very easily produces reunion, forms bulky grain.At present, nearly all liquid phase reduction, when preparing silver powder, all will add enough dispersants to prevent the reunion between silver-colored particle, prepares particle diameter, pattern and the dispersed requirement of used for solar batteries silver powder to reach.Dispersant is divided into three processes to the dispersion of silver powder: the dispersion of wetting, the silver particles group of silver powder and stop reassembling of silver powder.Finally, dispersant adsorption, on silver powder surface, prevents reassembling of silver powder, and the dispersant adding reduced the interfacial tension of solid-liquid interface, has therefore increased the thermodynamic stability of dispersion, and silver powder is difficult for reuniting.But this has also buried hidden danger for the purifying of silver powder, the amount of dispersant be not enough at least be coated completely silver powder, do not have the effect of dispersion, cross and to washing, to bring difficulty at most.In order to obtain the silver powder that purity is higher, most of way is that silver powder is carried out to a large amount of washing and alcohol washes repeatedly, not only causes waste, and can not get the silver powder that purity is higher; Application number is in the method for 200910218356.1 the disclosed preparing spherical superfine silver powder by using chemical reduction of Chinese patent, in order to obtain the silver powder that purity is higher, adopt 350 ℃ of insulation heat-treating methods to remove impurity, although obtained purer silver powder, but silver powder is very easily reunited in high-temperature calcination process, as can be seen here, the removal of dispersant is to prepare the technical problem facing in polymolecularity and highly purified silver powder preparation process.Application number is in the preparation method of silver powder in 200610027065.0 the disclosed electrode of solar battery printing slurry of Chinese patent; because the protective agent adding in this method preparation process is too much; cause the covering on silver powder surface more; affect the conductive effect of electrode; and the silver powder standby by this legal system can pollute silicon chip; when the silver of configuration is starched high temperature sintering, shrinkage factor is large, can not realize good Ohmic contact with semiconductor substrate, has reduced the electricity conversion of solar cell.
Summary of the invention
Technical problem to be solved by this invention is to provide that a kind of preparation process is easy, epigranular, polymolecularity, the preparation method of ultrapure silver powder and the silver powder of preparing thereof for highly purified applicable silver paste of solar cells, overcome above-mentioned the deficiencies in the prior art, be suitable for large-scale production simultaneously.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: the preparation method of ultrapure silver powder for a kind of solar cell conductive silver slurry, comprises the following steps:
(1) configuration of mixed reaction solution A: silver nitrate is dissolved in pure water, and making the concentration of silver nitrate is 0.2～1.2mol/L, the pH value that adds ammoniacal liquor or nitric acid to adjust solution is 4～10, adds dispersant simultaneously, obtains mixed reaction solution A;
(2) mix the configuration of reducing solution B: dissolution of ascorbic acid, in pure water, is made to ascorbic acid concentrations 0.8～4.8mol/L, add the pH value of ammoniacal liquor or nitric acid adjustment solution identical with mixed reaction solution A, obtain mixing reducing solution B;
(3) with mixed reaction solution A and described mixing reducing solution B to 20～80 ℃ described in thermostat water bath preheating;
(4) by described in thermostat water bath magnetic agitation, mix reducing solution B, the rotating speed of stirring is 500～2000r/min, after stabilization of speed, with the rate of addition of 1-8ml/s, adds described mixed reaction solution A to carry out reduction reaction;
(5) after dropwising, continue to stir 10～60min, obtain the mixed solution that contains silver powder, then carry out suction filtration, washing, alcohol wash, be dried, sieve and Cement Composite Treated by Plasma after, obtain the ultrapure silver powder of solar cell conductive silver slurry.
On the basis of technique scheme, the present invention can also do following improvement.
Further, in described step (1), obtain solution silver nitrate used is AR, and obtain solution pure electrical conductivity of water used is 0.05～5 μ S/cm.
Further, dispersant is one or more mixing in polyvinyl alcohol, gelatin, tween, polyethylene glycol, polyvinylpyrrolidone in described step (1), and mentioned reagent is AR, and the amount that described dispersant adds is 4%～12% of silver nitrate quality.
Further, in described step (2), obtain solution ascorbic acid used is AR, and obtain solution pure electrical conductivity of water used is 0.05～5 μ S/cm.
Further, in described step (3), mixed reaction solution A and mixing reducing solution B are preheated to same temperature.
Further, the mixed reaction solution A adding in described step (4) is 1:1 with described volume ratio of mixing reducing solution B.
Further, suction filtration, washing in described step (5), be dried, sieve and the detailed process of Cement Composite Treated by Plasma is: silver powder is after suction filtration, twice of first pure water washing, ethanol washing is twice again, dry 3～12h in 60～100 ℃ of vacuum drying chambers, cross after 250 mesh sieves, under plasma normal temperature 80～150W, process 30～60min.
Further, described Cement Composite Treated by Plasma atmosphere is one or more mixing in hydrogen, argon gas, helium.
Another technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of ultrapure silver powder of solar cell conductive silver slurry of preparing as above-mentioned preparation method, described solar cell conductive silver slurry by the specification of ultrapure silver powder is: high dispersive, uniform particle diameter, average grain diameter 0.1-5 μ m, narrow particle size distribution, tap density are>=4.5g/cm
3, purity>=99.99%.
Compared with prior art, advantage is in the present invention:
1. the application of plasma technique makes the silver powder purity of preparation higher, reach >=99.99%, while being more conducive to silver slurry sintering, the Ohmic contact of silver powder and silicon chip, forms dense film;
2. plasma post process is easy, reduces the use of a large amount of pure water and ethanol, is conducive to large-scale production;
3. carrying under highly purified prerequisite, do not change the characteristic of silver powder, making the silver powder of preparation, to have average grain diameter be 0.1-5 μ m, narrow particle size distribution, good dispersion, tap density>=4.5g/cm
3, be conducive to improve the electricity conversion of solar cell.
The specific embodiment
Below principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
1. take 102g silver nitrate and be dissolved in 300ml pure water, it is 10 that ammoniacal liquor regulates pH, takes 4.08g polyvinyl alcohol and is dissolved in 500ml pure water, and after mixing, constant volume becomes the mixed reaction solution A of 1000ml;
2. take 250g dissolution of ascorbic acid in 300ml pure water, it is 10 that ammoniacal liquor regulates pH, and constant volume becomes ascorbic acid-ammoniacal liquor mixing reducing solution B of 1000ml;
3. with thermostat water bath, heat mixed reaction solution A and mix reducing solution B to 50 ℃ of design temperatures;
4. under thermostat water bath magnetic agitation, be uniformly mixed reducing solution B, the rotating speed of stirring is 1000r/min, after stabilization of speed, with the rate of addition of 5ml/s, adds mixed reaction solution A;
5. after dropwising, continue to stir 10min, by gained silver powder suction filtration, wash twice, ethanol and wash twice, 80 ℃ are dried 3 hours, cross 250 mesh sieves, hydrogen gas plasma 80W normal temperature is processed 30min, and obtaining average grain diameter is that 1.3 μ m, particle size range are that 0.5～2.5 μ m, tap density are 4.5g/cm
3, purity>=99.99% dispersing ball silver powder.
Embodiment 2
1. take 51g silver nitrate and be dissolved in 300ml pure water, it is 7 that ammoniacal liquor regulates pH, takes 4.08g polyvinyl alcohol and is dissolved in 500ml pure water, and after mixing, constant volume becomes the mixed solution A of 1000ml;
2. take 211g dissolution of ascorbic acid in 300ml pure water, it is 7 that ammoniacal liquor regulates pH, and constant volume becomes ascorbic acid-ammoniacal liquor mixed solution B of 1000ml;
3. with thermostat water bath heating mixed solution A and B to 50 ℃ of design temperatures;
4. under thermostat water bath magnetic agitation, be uniformly mixed solution B, the rotating speed of stirring is 2000r/min, after stabilization of speed, with the rate of addition of 5ml/s, adds mixed liquor A;
5. after dropwising, continue to stir 30min, by gained silver powder suction filtration, wash twice, ethanol and wash twice, 60 ℃ are dried 3 hours, cross 250 mesh sieves, helium plasma 100W normal temperature is processed 30min, and obtaining average grain diameter is that 1.0 μ m, particle size range are that 0.6～1.2 μ m, tap density are 5.5g/cm
3, purity>=99.99% high dispersive ball shape silver powder.
Embodiment 3
1. take 51g silver nitrate and be dissolved in 300ml pure water, it is 5 that ammoniacal liquor regulates pH, takes 8.16g gelatin and is dissolved in 500ml pure water, and after mixing, constant volume becomes the mixed solution A of 1000ml;
2. take 300g dissolution of ascorbic acid in 300ml pure water, it is 5 that ammoniacal liquor regulates pH, and constant volume becomes ascorbic acid-ammoniacal liquor mixed solution B of 1000ml;
3. with thermostat water bath heating mixed solution A and B to 30 ℃ of design temperatures;
4. under thermostat water bath magnetic agitation, be uniformly mixed solution B, the rotating speed of stirring is 1500r/min, after stabilization of speed, with the rate of addition of 1ml/s, adds mixed liquor A;
5. after dropwising, continue to stir 30min, by gained silver powder suction filtration, wash twice, ethanol and wash twice, 60 ℃ are dried 3 hours, cross 250 mesh sieves, argon plasma 150W normal temperature is processed 30min, and obtaining average grain diameter is that 1.0 μ m, particle size range are that 0.3～3 μ m, tap density are 4.8g/cm
3, purity>=99.99% high dispersive ball shape silver powder.
Embodiment 4
1. take 51g silver nitrate and be dissolved in 300ml pure water, it is 7 that ammoniacal liquor regulates pH, takes 4.08g polyvinylpyrrolidone and is dissolved in 500ml pure water, and after mixing, constant volume becomes the mixed solution A of 1000ml;
2. take 211g dissolution of ascorbic acid in 300ml pure water, it is 7 that ammoniacal liquor regulates pH, and constant volume becomes ascorbic acid-ammoniacal liquor mixed solution B of 1000ml;
3. with thermostat water bath heating mixed solution A and B to 70 ℃ of design temperatures;
4. under thermostat water bath magnetic agitation, be uniformly mixed solution B, the rotating speed of stirring is 500r/min, after stabilization of speed, with the rate of addition of 5ml/s, adds mixed liquor A;
5. after dropwising, continue to stir 10min, by gained silver powder suction filtration, wash twice, ethanol and wash twice, 60 ℃ are dried 3 hours, cross 250 mesh sieves, helium plasma 100W normal temperature is processed 30min, and obtaining average grain diameter is that 1.1 μ m, particle size range are that 0.5～3 μ m, tap density are 5.0g/cm
3, purity>=99.99% high dispersive ball shape silver powder.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a preparation method for ultrapure silver powder for solar cell conductive silver slurry, is characterized in that, comprises the following steps:
(1) configuration of mixed reaction solution A: silver nitrate is dissolved in pure water, and making the concentration of silver nitrate is 0.2～1.2mol/L, the pH value that adds ammoniacal liquor or nitric acid to adjust solution is 4～10, adds dispersant simultaneously, obtains mixed reaction solution A;
(2) mix the configuration of reducing solution B: dissolution of ascorbic acid, in pure water, is made to ascorbic acid concentrations 0.8～4.8mol/L, add the pH value of ammoniacal liquor or nitric acid adjustment solution identical with mixed reaction solution A, obtain mixing reducing solution B;
(3) with mixed reaction solution A and described mixing reducing solution B to 20～80 ℃ described in thermostat water bath preheating;
(4) by described in thermostat water bath magnetic agitation, mix reducing solution B, the rotating speed of stirring is 500～2000r/min, after stabilization of speed, with the rate of addition of 1-8ml/s, adds described mixed reaction solution A to carry out reduction reaction;
(5) after dropwising, continue to stir 10～60min, obtain the mixed solution that contains silver powder, then carry out suction filtration, washing, alcohol wash, be dried, sieve and Cement Composite Treated by Plasma after, obtain the ultrapure silver powder of solar cell conductive silver slurry.
2. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, is characterized in that, the middle obtain solution silver nitrate used of described step (1) is AR, and obtain solution pure electrical conductivity of water used is 0.05～5 μ S/cm.
3. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, it is characterized in that, dispersant is one or more mixing in polyvinyl alcohol, gelatin, tween, polyethylene glycol, polyvinylpyrrolidone in described step (1), mentioned reagent is AR, and the amount that described dispersant adds is 4%～12% of silver nitrate quality.
4. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, is characterized in that, the middle obtain solution ascorbic acid used of described step (2) is AR, and obtain solution pure electrical conductivity of water used is 0.05～5 μ S/cm.
5. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, is characterized in that, in described step (3), mixed reaction solution A and mixing reducing solution B are preheated to same temperature.
6. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, is characterized in that, the mixed reaction solution A adding in described step (4) is 1:1 with described volume ratio of mixing reducing solution B.
7. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 1, it is characterized in that, suction filtration, washing in described step (5), be dried, sieve and the detailed process of Cement Composite Treated by Plasma is: silver powder is after suction filtration, twice of first pure water washing, ethanol washing is twice again, in 60～100 ℃ of vacuum drying chambers, dry 3～12h, crosses after 250 mesh sieves, under plasma normal temperature 80～150W, processes 30～60min.
8. the preparation method of ultrapure silver powder for solar cell conductive silver slurry according to claim 7, is characterized in that, described Cement Composite Treated by Plasma atmosphere is one or more mixing in hydrogen, argon gas, helium.
9. the solar cell conductive silver that preparation method prepares as described in claim 1 to 8 is starched and is used ultrapure silver powder, it is characterized in that, described solar cell conductive silver slurry by the specification of ultrapure silver powder is: average grain diameter 0.1～5 μ m, tap density are>=4.5g/cm
3, purity>=99.99%.
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| CN112536445A (en) * | 2020-12-10 | 2021-03-23 | 长沙新材料产业研究院有限公司 | Micro-nano dendritic silver powder and preparation method and application thereof |
| CN116618675A (en) * | 2023-05-30 | 2023-08-22 | 上海银波生物科技有限公司 | Preparation method of low-temperature sintering silver powder for heterojunction solar cell |
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| CN101834004A (en) * | 2010-05-28 | 2010-09-15 | 中国乐凯胶片集团公司 | Silver powder for conductive silver paste of solar battery electrode and preparation method thereof |
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