CN104064286B - A kind of preparation method of silver slurry used for solar batteries - Google Patents
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Abstract
The invention provides a kind of preparation method of silver slurry used for solar batteries, comprise the following steps: (1) prepares lead-free glass powder; (2) silver powder is prepared; (3) organic carrier is prepared; (4) preparation silver slurry; First the silver powder prepared in step (2) is added absolute ethyl alcohol with lead-free glass powder obtained in step (1) to mix, at 60 DEG C, stir and ultrasonic disperse 10min, all hooked the pressed powder G of dispersion; The organic carrier will prepared again, mixes with described pressed powder G, stirs and grinds 5 times, obtained described silver slurry used for solar batteries; Described silver powder: lead-free glass powder: the mass ratio=8:1:1 of organic carrier.Not leaded by the fill a prescription silver paste of solar cells that obtains of the present invention, meet environmental requirement completely, can form the conductive electrode of strong adhesion, low ohm contact resistance in solar cell surface, cell photoelectric conversion efficiency is high.
Description
Technical field
The present invention relates to technical field of solar, particularly a kind of preparation method of silver slurry used for solar batteries.
Background technology
Solar cell is a kind of semiconductor device that solar energy can be converted to electric energy, and under illumination condition, inside solar energy battery can produce photogenerated current, can directly be exported by electric energy by electrode.
At photoirradiated surface, in order to allow light enter inside semiconductor, electrode makes comb teeth-shaped usually.Its front electrode silver slurry printing forms, and backplate is formed by silver slurry, silver-colored aluminium paste or aluminium paste printing.Front electrode is usual by silver powder with silver slurry, organic solvent, the compositions such as glass dust.Front electrode of solar battery silver slurry requires good silk screen printing performance usually, the front silver electrode fine rule printed will have fine processability, namely the depth-width ratio printed electrode will be got well, but, the front side silver paste thixotropy of prior art and stability still have much room for improvement, and make the silver-colored arrangement of conductors after silk screen printing not fine and close, make the transformation efficiency of solar cell low.
Glassy bond is mutually usual to be combined by glass, oxide crystal or the mixture of the two, and its Main Function makes solidifying film layer and matrix strong bonded, and the selection of Binder Phase has a certain impact to the mechanical performance of film forming and electrical property.
Lead is one of 6 kinds of metals using the earliest of the mankind, and China has just manufactured the silicate glass containing PbO from the Western Zhou Dynasty to the Warring States Period (B.C. 7th ~ 9 century).Lead is a kind of cumulative toxicant, and it is easy to by gastrointestinal absorption, and wherein part destruction blood makes red blood cell decompose, and part is diffused into systemic organs and tissue by blood, and enters bone.And the lead compound be deposited in internal organs and marrow is extremely slow by the speed of discharging in body, form slow poisoning gradually.Chronic lead poisoning is only felt tired at first, lose the appetite, lose weight.When slow poisoning developing deeply, headache, tinnitus, vision disorder, miscarriage, anaemia, amentia will be presented, early wait indefinitely.Europe all proposes unleaded requirement to electronic product, toy and solder, and the legal provisions put into effect as EU member country rise on July 1st, 2006, enter the electronic product of European Union, comprise electronic toy, must not containing harmful substances such as lead, cadmium, mercury.These regulations all impel various countries to accelerate development crown glass above, comprise leadless crystal glass, lead-free optic glass, unleaded electrovacuum and electronic glass, crown glass solder.
The sealing temperature of flint glass to lead-in wire is low; Electrical insulation properties is good, and its resistance value is about 100 times of common Na2O-CaO-SiO2 glass; The processing temperature of lead glass is low, and processing job area is large, easily obtains required shape, so need the fluorescent tube of particular curve also to use flint glass as electricity-saving lamp etc.; Their coefficient of expansion and metal platinum are very close, can with Dumet wire sealing-in.In semiconductor instrument instrument without in shell sealing-in, application unorganic glass has obvious superiority than organic media in moisture resistance and robustness, and the temperature that unorganic glass is higher than organic media ability.And lead glass has that resistance is large, dielectric loss is little, refractive index and dispersion high, and absorb high-energy radiation, the series of characteristics such as softening temperature is low, chemical stability is good, so it has purposes widely in these areas.
In addition, general also containing more PbO in crystal glass, this is because high pbo glass has the excellent physical property such as high density, high refraction, make it the high-grade packaging material always becoming famous brand of wine, perfume and cosmetics etc., and be considered to irreplaceable in for a long time.
Silver slurry is the auxiliary material played a crucial role to the conversion efficiency of cell piece, and to the open circuit voltage, the increase short circuit current that improve battery, thus raising cell photoelectric conversion efficiency has very important effect.Silver slurry, by the method for silk screen printing, is printed on silicon substrate front, is sintered by tunnel sintering furnace, forms gate line electrode.Wherein, in the process of sintering, glass dust plays vital Link role, and it is more closely knit that good glass dust can make Argent grain sinter, and silver grating line and silicon strong adhesion, the ohmic contact resistance of cell piece is low.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is to provide a kind of preparation method of silver slurry used for solar batteries, and it is not leaded, good environmental protection, makes the silver-colored arrangement of conductors after silk screen printing fine and close simultaneously, and has larger depth-width ratio.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of preparation method of silver slurry used for solar batteries, comprising the following steps:
(1) lead-free glass powder is prepared;
This glass dust is made up of the material of following weight percent composition: SiO
22-4%, Al
2o
30.2-4%, B
2o
31-5%, ZnO5-10%, BaCO
30.2-1.5%, MgO0.5-2%, TeO
210-12%, SnO1-2%, P
2o
50.1-1%, surplus is Bi
2o
3;
The preparation method of described glass dust, comprises the following steps,
(1.1) by SiO
2, Al
2o
3, B
2o
3, ZnO, BaCO
3, MgO, TeO
2, SnO, P
2o
5, Bi
2o
3powder mix through ball milling;
(1.2) powder in step (1.1) is put into corundum crucible, above-mentioned corundum crucible is put into electric furnace, setting furnace temperature is 400 DEG C, heated at constant temperature 30min; This step can remove the moisture in the mixed-powder of metal oxide fully and fast, can also reduce the corrosiveness of melten glass to crucible in addition;
(1.3) powder in step (1.2) is put into hot crucible, then hot crucible is put into electric furnace, setting furnace temperature is 1100 DEG C, constant temperature 1h;
(1.4) take out the powder in step (1.3), carry out shrend, then dry under 80 DEG C of ambient temperatures;
(1.5) be abrading-ball by weight: water: the ratio of glass particle=3:1:1 puts into ball milling device, this ball milling device is put into ball mill and carry out ball milling, Ball-milling Time is 6h, and drum's speed of rotation is 450r/min.The time of ball milling is longer, the glass dust particle diameter obtained is less, but after 6h, the comparison face specific area of glass dust particle diameter and surface free energy become increasing, energy needed for refinement also increases thereupon, therefore inefficiency, and after the grinding of 6h, the particle diameter of its glass dust can meet the requirement preparing silver paste lead-free glass powder used for solar batteries;
(2) silver powder is prepared;
(2.1) take the ascorbic acid of 0.4mol/L as reducing agent, be dissolved at normal temperatures in deionized water, stir 50min wiring solution-forming A;
(2.2) take polyoxyethylene alkyl amine O.4mol/L as dispersant, its quality is 5% of silver nitrate, dissolved in deionized water, stirs 30min wiring solution-forming B;
(2.3) solution A prepared and B are poured into respectively in beaker, regulate the water temperature to 35 DEG C of reaction chamber, stir by electric mixer, mixing speed is 500r/min;
(2.4) solution B prepared is added in solution A, under normal temperature, stir 10min, obtained reducing solution C;
(2.5) take the ammoniacal liquor of 20%, add deionized water and make ammonia spirit concentration be 5%, wiring solution-forming D, solution D is added in reducing solution C and regulates pH value to be 7 ± 0.3, obtained reactant liquor E;
(2.6) silver nitrate, as oxidant, is dissolved in deionized water by the silver nitrate taking 0.3mol/L, and solution F is added in reactant liquor E by wiring solution-forming F, opens ultrasonic vibration and dissolution homogeneity is reacted;
(2.7) after reaction terminates, separate and subside thing, washing, dry, obtained silver powder;
(3) organic carrier is prepared;
Described organic carrier comprises organic solvent and organic additive, and described organic solvent is turpentine oil, and described organic additive is ethyl cellulose, and organic solvent and organic additive are carried out mixing and stirring according to part by weight 7: 1;
(4) preparation silver slurry;
First the silver powder prepared in step (2) is added absolute ethyl alcohol with lead-free glass powder obtained in step (1) to mix, at 60 DEG C, stir and ultrasonic disperse 10min, obtain the pressed powder G of equal Monodispersed; The organic carrier will prepared again, mixes with described pressed powder G, stirs and grinds 5 times, obtained described silver slurry used for solar batteries; Described silver powder: lead-free glass powder: the mass ratio=8:1:1 of organic carrier.
Wherein, the described abrading-ball in described step (1.5) comprises large ball and bead, and described large bulb diameter is 8mm, and described the small ball's diameter is 5mm, and the ratio of the number of described large ball and bead is 1:5.
Because bismuth and lead are adjacent elements, belong to the P district in the VIth cycle, there is similar character, as lower in fusing point (PbO888 DEG C, Bi
2o
3820 DEG C), there are larger polarizability and higher Refraction and dispersion easily to form glass etc.In flint glass structure, PbO is connected with 4 oxygen atoms by lone pair electrons, forms [PbO4] tetrahedral structure, and be connected with [SiO4] by tetrahedron top, form glass network, can not be out of shape during the chain expanded by heating of this spiral type, the coefficient of expansion is larger.Bi
2o
3with [BiO
3] and [BiO
6] form enter network, and [SiO
4] cooperatively form glass network skeleton.Theoretically, according to element diagonal and adjacent rule, although the poisonous bismuth oxide of bismuth does not have toxicity.Bismuth forms all very similar to plumbous atomic weight, ionic radius with electronics, and its skin all has 6S2 electronics, Bi
2o
3similar with character at glass structure with PbO, there is the higher coefficient of expansion, therefore lead can be replaced to prepare crown glass with bismuth.
Sn and Pb belongs to the IVth major element together, so both have similar chemical property.Stannous ion Sn
2+outer shell structure and Pb
2+similar, and also there is asymmetric square conical structure, Sn in crystalline state SnO
2+be positioned at the top of square conical, the inertia electronics of stannous ion is in away from 4 cationic one sides.In high tin glass, all there is this square conical, it forms a kind of chain structure of spiral type.This special structure makes SnO have the fluxibility of height in glass just.SnO1-2% is added in the technical program.
ZnO effect is in glass the chemical stability regulating glass high temperature viscosity and change glass.Due to Zn
2+and O
2-the relation of ionic radius, it may form the structural network organizator that ligancy is 4, also may form extra-network ion.If form [ZnO
4], then can affect softening point and the fusion point of system, the structure of system can be made more stable.If can not [ZnO be formed
4], then become the modified ion of glass network.When ZnO content is in certain scope, ZnO is mainly filled in glass network becomes modified oxide, system stability is reduced and shows as softening point and fusing point reduction.After ZnO exceedes certain content, in system, define [ZnO
4] structure, add the stability of system, show as the increase of softening point and fusing point.ZnO5-10% is added in the technical program.
SiO
2there is strong vitrifying tendency, the mobility increasing glass dust is played an important role, is mainly present in glass with bridging oxygen and non-bridging oxygen structure two kinds of frame modes, jointly forms the basic network of glass with other component, but addition can not be too much, otherwise its stability can be reduced.SiO is added in the technical program
22-4%.
B
2o
3for forming the oxide of glass basic framework, mechanical performance and the excellent glass of electrical property can be formed separately.B is added in the technical program
2o
31-5%.
Al
2o
3, MgO and P
2o
5being the process based prediction model in order to regulate glass, to reach the performance requirement required for us, the thermal coefficient of expansion of glass, mechanical strength, heat and chemical stability etc. can being improved.Al is added respectively in the technical program
2o
30.2-4%, MgO0.5-2% and P
2o
50.1-1%.
TeO
2bi can be helped in sintering process
2o
3better corrode the antireflective film on silicon wafer upper strata with SnO, conductive silver powder is better contacted with silicon, form silicon silver alloy, increase the adhesive force of silver electrode at battery surface.
(3) beneficial effect
Not leaded by the fill a prescription silver paste of solar cells that obtains of the present invention, meet environmental requirement completely, can form the conductive electrode of strong adhesion, low ohm contact resistance in solar cell surface, cell photoelectric conversion efficiency is high, is the desirable substituent of leaded silver slurry.Particle diameter in addition owing to preparing is the spherical silver powder of about 40nm, the electrode dense uniform that screen printing is made, and contact resistance is little, and bonding firmly.
Wherein lead-free glass powder uniform particles, good dispersion, softening point is between 350-450 DEG C; Main component is ZnO, TeO
2and Bi
2o
3and be equipped with other various a small amount of materials modification is carried out to it, if one or both compositions only, glass dust performance does not all reach the best, mentioned component is only had to be combined with each other according to a specific ratio, organically, just can impel the existing lower softening temperature of glass dust, have again reasonable sintering to live; It can promote that conductive silver powder better sinters, and makes electrode more closely knit, forms good ohmic contact, reduces series resistance.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with specific embodiment.
The invention provides a kind of preparation method of silver slurry used for solar batteries, comprise the following steps:
(1) lead-free glass powder is prepared;
This glass dust is made up of the material of following weight percent composition: SiO
22-4%, Al
2o
30.2-4%, B
2o
31-5%, ZnO5-10%, BaCO
30.2-1.5%, MgO0.5-2%, TeO
210-12%, SnO1-2%, P
2o
50.1-1%, surplus is Bi
2o
3;
The preparation method of described glass dust, comprises the following steps,
(1.1) by SiO
2, Al
2o
3, B
2o
3, ZnO, BaCO
3, MgO, TeO
2, SnO, P
2o
5, Bi
2o
3powder mix through ball milling;
(1.2) powder in step (1.1) is put into corundum crucible, above-mentioned corundum crucible is put into electric furnace, setting furnace temperature is 400 DEG C, heated at constant temperature 30min; This step can remove the moisture in the mixed-powder of metal oxide fully and fast, can also reduce the corrosiveness of melten glass to crucible in addition;
(1.3) powder in step (1.2) is put into hot crucible, then hot crucible is put into electric furnace, setting furnace temperature is 1100 DEG C, constant temperature 1h;
(1.4) take out the powder in step (1.3), carry out shrend, then dry under 80 DEG C of ambient temperatures;
(1.5) be abrading-ball by weight: water: the ratio of glass particle=3:1:1 puts into ball milling device, this ball milling device is put into ball mill and carry out ball milling, Ball-milling Time is 6h, and drum's speed of rotation is 450r/min.The time of ball milling is longer, the glass dust particle diameter obtained is less, but after 6h, the comparison face specific area of glass dust particle diameter and surface free energy become increasing, energy needed for refinement also increases thereupon, therefore inefficiency, and after the grinding of 6h, the particle diameter of its glass dust can meet the requirement preparing silver paste lead-free glass powder used for solar batteries.
(2) silver powder is prepared;
(2.1) take the ascorbic acid of 0.4mol/L as reducing agent, be dissolved at normal temperatures in deionized water, stir 50min wiring solution-forming A;
(2.2) take polyoxyethylene alkyl amine O.4mol/L as dispersant, its quality is 5% of silver nitrate, dissolved in deionized water, stirs 30min wiring solution-forming B;
(2.3) solution A prepared and B are poured into respectively in beaker, regulate the water temperature to 35 DEG C of reaction chamber, stir by electric mixer, mixing speed is 500r/min;
(2.4) solution B prepared is added in solution A, under normal temperature, stir 10min, obtained reducing solution C;
(2.5) take the ammoniacal liquor of 20%, add deionized water and make ammonia spirit concentration be 5%, wiring solution-forming D, solution D is added in reducing solution C and regulates pH value to be 7 ± 0.3, obtained reactant liquor E;
(2.6) silver nitrate, as oxidant, is dissolved in deionized water by the silver nitrate taking 0.3mol/L, and solution F is added in reactant liquor E by wiring solution-forming F, opens ultrasonic vibration and dissolution homogeneity is reacted;
(2.7) after reaction terminates, separate and subside thing, washing, dry, obtained silver powder.
(3) organic carrier is prepared;
Described organic carrier comprises organic solvent and organic additive, and described organic solvent is turpentine oil, and described organic additive is ethyl cellulose, and organic solvent and organic additive are carried out mixing and stirring according to part by weight 7: 1;
(4) preparation silver slurry;
First the silver powder prepared in step (2) is added absolute ethyl alcohol with lead-free glass powder obtained in step (1) to mix, at 60 DEG C, stir and ultrasonic disperse 10min, obtain homodisperse pressed powder G; The organic carrier will prepared again, mixes with described pressed powder G, stirs and grinds 5 times, obtained described silver slurry used for solar batteries; Described silver powder: lead-free glass powder: the mass ratio=8:1:1 of organic carrier.
Wherein, the described abrading-ball in described step (1.5) comprises large ball and bead, and described large bulb diameter is 8mm, and described the small ball's diameter is 5mm, and the ratio of the number of described large ball and bead is 1:5.
Embodiment one
Raw material is taken according to mass ratio:
SiO
220g，Al
2O
32g，B
2O
310g，ZnO50g，BaCO
32g，MgO5g，TeO
2100g，SnO10g，P
2O
51g，Bi
2O
3800g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S1.
Embodiment two
Raw material is taken according to mass ratio:
SiO
225g，Al
2O
35g，B
2O
320g，ZnO60g，BaCO
35g，MgO10g，TeO
2105g，SnO12g，P
2O
52g，Bi
2O
3756g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S2.
Embodiment three
Raw material is taken according to mass ratio:
SiO
230g，Al
2O
310g，B
2O
325g，ZnO65g，BaCO
38g，MgO12g，TeO
2108g，SnO14g，P
2O
55g，Bi
2O
3723g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S3.
Embodiment four
Raw material is taken according to mass ratio:
SiO
235g，Al
2O
310g，B
2O
325g，ZnO70g，BaCO
38g，MgO12g，TeO
2110g，SnO14g，P
2O
55g，Bi
2O
3711g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S4.
Embodiment five
Raw material is taken according to mass ratio:
SiO
238g，Al
2O
310g，B
2O
325g，ZnO70g，BaCO
38g，MgO12g，TeO
2115g，SnO16g，P
2O
56g，Bi
2O
3700g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S5.
Embodiment six
Raw material is taken according to mass ratio:
SiO
240g，Al
2O
340g，B
2O
350g，ZnO100g，BaCO
315g，MgO20g，TeO
2120g，SnO20g，P
2O
510g，Bi
2O
3585g；
By above-mentioned raw materials obtained glass dust after mixing, preheating and drying, heating, shrend, ball milling, gained glass dust is designated as S6.
Performance test and statistics
The glass dust the performance test results of the S1-S6 that table 1 embodiment obtains
The softening point (Ts) of the employing DTA tested glass powder in table 1 and and employing thermal dilatometer test thermal coefficient of expansion (α).
After organic carrier prepared by the silver powder prepared with step (2) respectively by the glass dust of S1-S6, step (3) mixes, be denoted as S11-S66 respectively according to the obtained conductive silver paste of step (4).
By conductive silver paste S11-S66,90 microns of web plate silk screens are adopted to be printed on respectively on polysilicon chip (specification: silicon chip 200 microns, before corrosion, front thickness is substantially constant with printing).Printing weight is the general 0.2-0.8 gram of every sheet slurry, directly puts into infrared sintering furnace and sinters.Namely solar battery sheet is obtained after coming out of the stove;
The model adopting Shanghai Communications University He Shuan Science and Technology Ltd. to produce is that the solar battery sheet electricity conversion special test equipment of HSC1/XSCM-9 is to obtained its light conversion ratio of cell slice test of the conductive silver paste by S11-S66 and series resistance (Rs); Then be welded in main gate line by welding, be fixed on automatic puller system by cell piece, pull welding, test angles is 45 degree, live width 1cm.All test results are recorded in table 2.Glass dust of the present invention has the sintering that can promote conductive silver powder as can be known from Table 2, electrode is sintered more closely knit; Be conducive to forming good ohmic contact, reduce the effect that solar cell series resistance increases the adhesive force of electrode.
The cell piece performance that table 2 is made up of the conductive silver paste of S11-S66
| S11 | S22 | S33 | S44 | S55 | S66 | |
| Adhesive force (N) | 2.2 | 2.5 | 2.8 | 2.6 | 2.5 | 2.7 |
| Rs(Ω) | 0.00332 | 0.00365 | 0.00324 | 0.00348 | 0.00338 | 0.00355 |
| Light conversion ratio (%) | 18.1 | 19.2 | 17.5 | 18 | 18.5 | 18.8 |
Before and after silk-screen sintering, silver-colored line statistics is listed in the table below in 3.
Table 3: silver-colored line statistics before and after silk-screen silk-screen sintering
Not leaded by the fill a prescription silver paste of solar cells that obtains of the present invention, meet environmental requirement completely, can form the conductive electrode of strong adhesion, low ohm contact resistance in solar cell surface, cell photoelectric conversion efficiency is high, is the desirable substituent of leaded silver slurry.Particle diameter in addition owing to preparing is the spherical silver powder of about 40nm, the electrode dense uniform that screen printing is made, and contact resistance is little, and bonding firmly.
Wherein lead-free glass powder uniform particles, good dispersion, softening point is between 350-450 DEG C; Main component is ZnO, TeO
2and Bi
2o
3and be equipped with other various a small amount of materials modification is carried out to it, if one or both compositions only, glass dust performance does not all reach the best, mentioned component is only had to be combined with each other according to a specific ratio, organically, just can impel the existing lower softening temperature of glass dust, have again reasonable sintering to live; It can promote that conductive silver powder better sinters, and makes electrode more closely knit, forms good ohmic contact, reduces series resistance.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. a preparation method for silver slurry used for solar batteries, is characterized in that, comprise the following steps:
(1) lead-free glass powder is prepared;
This glass dust is made up of the material of following weight percent composition: SiO
22-4%, Al
2o
30.2-4%, B
2o
31-5%, ZnO5-10%, BaCO
30.2-1.5%, MgO0.5-2%, TeO
210-12%, SnO1-2%, P
2o
50.1-1%, surplus is Bi
2o
3;
The preparation method of described glass dust, comprises the following steps,
(1.1) by SiO
2, Al
2o
3, B
2o
3, ZnO, BaCO
3, MgO, TeO
2, SnO, P
2o
5, Bi
2o
3powder mix through ball milling;
(1.2) powder in step (1.1) is put into corundum crucible, above-mentioned corundum crucible is put into electric furnace, setting furnace temperature is 400 DEG C, heated at constant temperature 30min;
(1.3) powder in step (1.2) is put into hot crucible, then hot crucible is put into electric furnace, setting furnace temperature is 1100 DEG C, constant temperature 1h;
(1.4) take out the powder in step (1.3), carry out shrend, then dry under 80 DEG C of ambient temperatures;
(1.5) by weight being abrading-ball: water: the ratio of glass particle=3:1:1 puts into ball milling device, this ball milling device is put into ball mill and carry out ball milling, Ball-milling Time is 6h, and drum's speed of rotation is 450r/min;
(2) silver powder is prepared;
(2.1) take the ascorbic acid of 0.4mol/L as reducing agent, be dissolved at normal temperatures in deionized water, stir 50min wiring solution-forming A;
(2.2) take polyoxyethylene alkyl amine O.4mol/L as dispersant, its quality is 5% of silver nitrate, dissolved in deionized water, stirs 30min wiring solution-forming B;
(2.3) solution A prepared and B are poured into respectively in beaker, regulate the water temperature to 35 DEG C of reaction chamber, stir by electric mixer, mixing speed is 500r/min;
(2.4) solution B prepared is added in solution A, under normal temperature, stir 10min, obtained reducing solution C;
(2.5) take the ammoniacal liquor of 20%, add deionized water and make ammonia spirit concentration be 5%, wiring solution-forming D, solution D is added in reducing solution C and regulates pH value to be 7 ± 0.3, obtained reactant liquor E;
(2.6) silver nitrate, as oxidant, is dissolved in deionized water by the silver nitrate taking 0.3mol/L, and solution F is added in reactant liquor E by wiring solution-forming F, opens ultrasonic vibration and dissolution homogeneity is reacted;
(2.7) after reaction terminates, separate and subside thing, washing, dry, obtained silver powder;
(3) organic carrier is prepared;
Described organic carrier comprises organic solvent and organic additive, and described organic solvent is turpentine oil, and described organic additive is ethyl cellulose, and organic solvent and organic additive are carried out mixing and stirring according to part by weight 7: 1;
(4) preparation silver slurry;
First the silver powder prepared in step (2) is added absolute ethyl alcohol with lead-free glass powder obtained in step (1) to mix, at 60 DEG C, stir and ultrasonic disperse 10min, obtain homodisperse pressed powder G; The organic carrier will prepared again, mixes with described pressed powder G, stirs and grinds 5 times, obtained described silver slurry used for solar batteries; Described silver powder: lead-free glass powder: the mass ratio=8:1:1 of organic carrier.
2. the preparation method of silver slurry used for solar batteries according to claim 1, it is characterized in that: the described abrading-ball in described step (1.5) comprises large ball and bead, described large bulb diameter is 8mm, and described the small ball's diameter is 5mm, and the ratio of the number of described large ball and bead is 1:5.
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