CN102543258A - Environmentally-friendly and innocuous polycrystalline silicon solar energy battery back electric field slurry containing phosphorus and preparation method thereof - Google Patents
Environmentally-friendly and innocuous polycrystalline silicon solar energy battery back electric field slurry containing phosphorus and preparation method thereof Download PDFInfo
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Abstract
The invention provides environmentally-friendly and innocuous polycrystalline silicon solar energy battery back electric field slurry containing phosphorus and a preparation method thereof and relates to battery back electric field slurry and a preparation method thereof. The slurry comprises the following components in percentage by weight: 20-35 percent of nanometer lithium phosphate powder, 50-68 percent of aluminum powder, 8-16 percent of organic carriers, 0.5-6 percent of bonding materials, 2-15 percent of solvents and 0.2-2.2 percent of dispersing agents; and the preparation method of the slurry comprises the following steps of: S1, selecting the grain sizes of the nanometer lithium phosphate powder and the aluminum powder; S2, preparing the bonding materials; S3, preparing the organic carriers; S4, preparing the solvents; S5, preparing the dispersing agents; and S6, preparing the solar energy battery back electric field slurry. The slurry has the beneficial effects that no Pb, Cd and other poisonous substance is contained, the problem of environmental pollution caused by back electric field silver aluminum slurry containing Pb is truly solved, the strength enhancement of a solar energy battery back electric field is further benefited, and the passivation level of a battery surface field is easily improved, thereby better light absorption rate and lower light reflection rate are obtained, so that the photoelectric conversion efficiency of a battery is remarkably improved.
Description
Technical field
The present invention relates to a kind of battery back electric field slurry and preparation method thereof, particularly a kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry and preparation method thereof.
Background technology
Energy problem has become the focus and the difficult point of global economy development; Solar energy is the energy that is rich in development prospect and potentiality; Over nearly 2 years, just with annual speed rapid growth more than 50%, wherein solar cell is that conversion of solar energy is the important devices of electric energy in the utilization of solar energy source; It is main being still with polysilicon solar cell in the photovoltaic generation at present, occupies about 90% of whole market share.And back of the body electric field slurry is the important materials of polysilicon solar cell back electrode, and it can pass through methods such as vapor deposition, sputter and silk screen printing, forms back electrode grid line firm, low ohm contact resistance at the silicon chip back side of polysilicon solar cell.Domestic year use amount of nearly 2 years back of the body electric field slurries reached about 160 tons, and volume of production and marketing all increases fast.But, increasing because these slurry ubiquities contain noxious substances such as Pb to the pollution of environment, the sustainable development of photovoltaic industry has been produced certain influence.Public announcement of a patent application number discloses a kind of " environment-friendly crystal silicon solar battery back electric field silver aluminum slurry and preparation method thereof " for CN102024856 A; This patent application has proposed a kind of solar battery back electric field slurry that does not contain six materials that the RoHS of European Union instruction forbidden and preparation method thereof; But there is following shortcoming in this patent application: (1), battery back electric field weak strength, and the cell photoelectric conversion efficiency is not high; (2), the preparation process of binding material is under 900-1200 ℃ condition, to carry out, temperature retention time is 30-60 minute simultaneously, and the slurry particle mean size≤10 μ m of final preparation; Because temperature drift in the preparation process of slurry, and temperature retention time is longer, these high temperature links will cause the solar cell electric property to reduce or amplification not obvious; In addition, the slurry particle diameter that makes is thick also can be to the absorption or the reflection influence to some extent of light.
Summary of the invention
The technical problem that the present invention will solve is: a kind of phosphorous environment-protecting asepsis type polysilicon solar cell back of the body electric field slurry and preparation method thereof is provided, to solve exist in the above-mentioned prior art big for environment pollution, the cell photoelectric conversion efficiency is not high, the battery electric property reduces weak point.
The technical scheme that solves the problems of the technologies described above is: a kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry, and the composition of this slurry and percentage by weight are: nanometer lithium phosphate powder 20～35%, aluminium powder 50～68%; Organic carrier: 8～16%; Binding material: 0.5～6%; Solvent: 2～15%; Dispersant: 0.2～2.2%, the weight summation of above-mentioned each composition is 100%.
Further technical scheme of the present invention is: the particle diameter＜40nm of said nanometer lithium phosphate powder, the particle diameter of aluminium powder＜1.0 μ m.
Described organic carrier is 30～40% ethyl cellulose resin to be dissolved in 60～70% the organic solvent to form by weight percentage.
Organic solvent in the described organic carrier is the propane diols butyl ether.
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：25～35%， Bi
2O
3：35～55%， Al
2O
3：0～5%， SiO
2：0.05～5%，
TiO
2：0～5%， NiO：0.05～4%， ZnO：15～35%，?Ga
2O
3：0.5～10%，
La
2O
3：0.05～3%，?LiFePO
4:0.5～5%，
The weight summation of the composition of above-mentioned binding material is 100%.
Further again technical scheme of the present invention is: described B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤5nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm.
Described solvent is the terephthalic acid (TPA) dibutyl ester.
Described dispersant is husky rope wax.
Another technical scheme of the present invention is: this method may further comprise the steps:
S1, choose the nanometer lithium phosphate powder of particle diameter＜40nm; Choose the aluminium powder of particle diameter＜1.0 μ m;
The preparation of S2, binding material:
S2.1, choose nano oxidized raw material by following particle diameter:
B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm;
S2.2, take by weighing each by following percentage by weight and chosen the nano oxidized raw material of particle diameter:
B
2O
3：25～35%， Bi
2O
3：35～55%， Al
2O
3：0～5%， SiO
2：0.05～5%，
TiO
2：0～5%， NiO：0.05～4%， ZnO：15～35%，?Ga
2O
3：0.5～10%，
La
2O
3：0.05～3%，?LiFePO
4:?0.5～5%，
The weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, each nano-oxide raw materials mix is passed in the high temperature furnace after evenly, insulation is 20-30 minute under 380-480oC, carries out ball milling after quenching with deionized water subsequently, and mistake 400 mesh sieves are promptly processed binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30～40% is added in 60～70% the organic solvent by weight percentage, and this organic solvent is the propane diols butyl ether; Place the Water Tank with Temp.-controlled of 80～90oC then, ethyl cellulose resin is dissolved in the organic solvent fully, promptly obtain organic carrier after filtering;
The preparation of S4, solvent: choose the terephthalic acid (TPA) dibutyl ester as solvent;
S5: the preparation of dispersant: choose husky rope wax as dispersant;
The preparation of S6, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry: get 20～35% nanometer lithium phosphate powder, get 50～68% aluminium powder, 8～16% organic carrier, 0.5～6% binding material, 2～15% solvent, 0.2～2.2% dispersant according to percentage by weight; After mixing in the planetary stirring machine; Be dispersed to particle mean size＜below the 1.0 μ m on the three-roller again, can making phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry.
Owing to adopt technique scheme, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry of the present invention and preparation method thereof compared with prior art has following beneficial effect:
1, can solve with containing the problem of environmental pollution that Pb back electric field silver aluminum slurry causes:
Because in the composition of the present invention's phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry; Do not contain 6 kinds of noxious substances such as Pb, Cd, Hg, Cr (Vl), PBBs PBB, PBDE PBDE; Stock quality meets the regulation of the RoHS of European Union about the instruction 2005/84/EC of phthalic acid ester, has really solved present photovoltaic industry with containing the problem of environmental pollution that Pb back electric field silver aluminum slurry causes.
2, the cell photoelectric conversion efficiency is high:
In the present invention's phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry; The content of lithium phosphate powder reaches 20～35%; This is not only because diffusion concentration ratio silver, all high one magnitude of aluminium of phosphorus; The phosphorus gettering is faster than silver, aluminium gettering, and the more important thing is that phosphorus can absorb the inner beavy metal impurity of silicon chip, helps improving polysilicon P-N junction characteristic.Therefore, phosphorous slurry more helps the enhancing of solar battery back electric field intensity, is easier to improve battery surface field passivation level, thereby obtains better absorptivity and lower light reflectivity, and it is more remarkable that the cell photoelectric conversion efficiency is improved.
3, the electric property of battery is better:
Because in phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry of the present invention and preparation method thereof; The lithium phosphate powder is to adopt nanometer lithium phosphate powder, and binding material is to prepare with nano-oxide, because its particle is little; Nano-particle surface can be high; Therefore cause slurry fusing point, sintering temperature and crystallization temperature all much lower than conventional powder body material, the light absorption of polycrystal silicon cell like this, sensitiveness are better, and the electric property of battery is even better.
In addition, because binding material of the present invention has adopted nano material Ga
2O
3, La
2O
3, LiFePO
4Substitute traditional coarse grain material CaO, NiO
2, Li
2O, V
2O
5Deng, its role is to: the one, the sintering temperature that can make binding material prepare process reduces more than one times; The 2nd, Ga
2O
3(gallium oxide) is a kind of wide bandgap semiconductor, its energy gap Eg=4.9eV, and its electric conductivity and the characteristics of luminescence are better, La
2O
3(lanthana) helps the improvement of solar cell dielectric property, LiFePO
4(LiFePO4) plays good catalytic action.
4, cost low, be easy to produce in batches:
Because in the composition of the present invention's phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry; The binding material that includes nanometer lithium phosphate powder and prepare by nano-oxide; These nano materials are domestic to be produced in enormous quantities; Price is also lower, is easy to produce in batches the present invention's slurry, also helps the target that realizes that the polysilicon solar cell cost reduces, production scale enlarges.
Below, the technical characterictic of the present invention's phosphorous environment-protecting asepsis polysilicon solar cell being carried on the back electric field slurry and preparation method thereof in conjunction with specific embodiment is further described.
Specific embodiment
Embodiment one:
A kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry, the composition of this slurry and percentage by weight are: nanometer lithium phosphate powder 20%, aluminium powder 68%; Organic carrier: 8%; Binding material: 0.5%; Solvent: 3.3%; Dispersant: 0.2%, the weight summation of above-mentioned each composition is 100%.
Wherein, Particle diameter＜the 40nm of said nanometer lithium phosphate powder; The particle diameter of aluminium powder＜1.0 μ m, described organic carrier are 30% ethyl cellulose resin to be dissolved in 70% the organic solvent to form by weight percentage, and organic solvent is the propane diols butyl ether; Described solvent is the terephthalic acid (TPA) dibutyl ester, and described dispersant is husky rope wax.
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：25%， Bi
2O
3：55%， Al
2O
3：0%， SiO
2：0.05%，
TiO
2：0%， NiO：0.05%， ZnO：15%， Ga
2O
3：3%，
La
2O
3：0.9%，?LiFePO
4:1%，
The weight summation of the composition of above-mentioned binding material is 100%.
Described B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤5nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm.
Its preparation method of above-mentioned phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry comprises following method:
S1, choose the nanometer lithium phosphate powder of particle diameter＜40nm; Choose the aluminium powder of particle diameter＜1.0 μ m;
The preparation of S2, binding material:
S2.1, choose nano oxidized raw material by following particle diameter:
B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm;
S2.2, take by weighing each by following percentage by weight and chosen the nano oxidized raw material of particle diameter:
B
2O
3：25%， Bi
2O
3：55%， Al
2O
3：0%， SiO
2：0.05%，
TiO
2：0%， NiO：0.05%， ZnO：15%，?Ga
2O
3：3%，
La
2O
3：0.9%， LiFePO
4:1%，
The weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, each nano-oxide raw materials mix is passed in the high temperature furnace after evenly, insulation is 20 minutes under 380oC, carries out ball milling after quenching with deionized water subsequently, and mistake 400 mesh sieves are promptly processed binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30% is added in 70% the organic solvent by weight percentage, and this organic solvent is the propane diols butyl ether; Place the Water Tank with Temp.-controlled of 80oC then, ethyl cellulose resin is dissolved in the organic solvent fully, promptly obtain organic carrier after filtering;
The preparation of S4, solvent: choose the terephthalic acid (TPA) dibutyl ester as solvent;
S5: the preparation of dispersant: choose husky rope wax as dispersant;
The preparation of S6, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry: get nanometer lithium phosphate powder 20%, aluminium powder 68%, organic carrier 8% according to percentage by weight; Binding material 0.5%; Solvent 3.3%, dispersant 0.2% is after mixing in the planetary stirring machine; Be dispersed to particle mean size＜below the 1.0 μ m on the three-roller again, can making phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry.
Embodiment two:
A kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry, it is characterized in that: the composition of this slurry and percentage by weight are: nanometer lithium phosphate powder 25%, aluminium powder 55%; Organic carrier: 10%; Binding material: 3%; Solvent: 6%; Dispersant: 1%, the weight summation of above-mentioned each composition is 100%.
Wherein, Particle diameter＜the 40nm of said nanometer lithium phosphate powder; The particle diameter of aluminium powder＜1.0 μ m, described organic carrier are 35% ethyl cellulose resin to be dissolved in 65% the organic solvent to form by weight percentage, and organic solvent is the propane diols butyl ether; Described solvent is the terephthalic acid (TPA) dibutyl ester, and dispersant is husky rope wax.
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：30%， Bi
2O
3：45%， Al
2O
3：3%， SiO
2：0.5%，
TiO
2：1%， NiO：0.5%， ZnO：18%，?Ga
2O
3：0.5%，
La
2O
3：1%， LiFePO
4:0.5%，
The weight summation of the composition of above-mentioned binding material is 100%;
Above-mentioned B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤5nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm.
Its preparation method of above-mentioned phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry comprises following method:
S1, choose the nanometer lithium phosphate powder of particle diameter＜40nm; Choose the aluminium powder of particle diameter＜1.0 μ m;
The preparation of S2, binding material:
S2.1, choose nano oxidized raw material by following particle diameter:
B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm;
S2.2, take by weighing each by following percentage by weight and chosen the nano oxidized raw material of particle diameter:
B
2O
3：30%， Bi
2O
3：45%， Al
2O
3：3%， SiO
2：0.5%，
TiO
2：1%， NiO：0.5%， ZnO：18%，?Ga
2O
3：0.5%，
La
2O
3：1%， LiFePO
4:0.5%，
The weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, each nano-oxide raw materials mix is passed in the high temperature furnace after evenly, insulation is 25 minutes under 430oC, carries out ball milling after quenching with deionized water subsequently, and mistake 400 mesh sieves are promptly processed binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 35% is added in 65% the organic solvent by weight percentage, and this organic solvent is the propane diols butyl ether; Place the Water Tank with Temp.-controlled of 85oC then, ethyl cellulose resin is dissolved in the organic solvent fully, promptly obtain organic carrier after filtering;
The preparation of S4, solvent: choose the terephthalic acid (TPA) dibutyl ester as solvent;
S5: the preparation of dispersant: choose husky rope wax as dispersant;
The preparation of S6, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry: get nanometer lithium phosphate powder 25%, aluminium powder 55% according to percentage by weight; Organic carrier: 10%; Binding material: 3%; Solvent: 6%; Dispersant: 1%, after mixing in the planetary stirring machine, be dispersed to particle mean size＜below the 1.0 μ m on the three-roller again, can make phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry.
Embodiment three:
A kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry, the composition of this slurry and percentage by weight are: nanometer lithium phosphate powder 35%, aluminium powder 50%; Organic carrier: 9%; Binding material: 2%; Solvent: 2%; Dispersant: 2%, the weight summation of above-mentioned each composition is 100%.
Wherein, the particle diameter＜40nm of said nanometer lithium phosphate powder, the particle diameter of aluminium powder＜1.0 μ m, described organic carrier are dissolved in 40% ethyl cellulose resin in 60% the organic solvent to form by weight percentage, and organic solvent is the propane diols butyl ether.Described solvent is the terephthalic acid (TPA) dibutyl ester, and dispersant is husky rope wax.
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：35%， Bi
2O
3：35%， Al
2O
3：5%， SiO
2：1%，
TiO
2：5%， NiO：0.25%， ZnO：15%，?Ga
2O
3：0.5%，
La
2O
3：0.25%，?LiFePO
4:3%，
The weight summation of the composition of above-mentioned binding material is 100%.
Above-mentioned B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤5nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm.
The preparation method of above-mentioned phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry may further comprise the steps:
S1, choose the nanometer lithium phosphate powder of particle diameter＜40nm; Choose the aluminium powder of particle diameter＜1.0 μ m;
The preparation of S2, binding material:
S2.1, choose nano oxidized raw material by following particle diameter:
B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm;
S2.2, take by weighing each by following percentage by weight and chosen the nano oxidized raw material of particle diameter:
B
2O
3：35%， Bi
2O
3：35%， Al
2O
3：5%， SiO
2：1%，
TiO
2：5%， NiO：0.25%， ZnO：15%，?Ga
2O
3：0.5%，
La
2O
3：0.25%，?LiFePO
4:3%，
The weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, each nano-oxide raw materials mix is passed in the high temperature furnace after evenly, insulation is 30 minutes under 480oC, carries out ball milling after quenching with deionized water subsequently, and mistake 400 mesh sieves are promptly processed binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 40% is added in 60% the organic solvent by weight percentage, and this organic solvent is the propane diols butyl ether; Place the Water Tank with Temp.-controlled of 90oC then, ethyl cellulose resin is dissolved in the organic solvent fully, promptly obtain organic carrier after filtering;
The preparation of S4, solvent: choose the terephthalic acid (TPA) dibutyl ester as solvent;
S5: the preparation of dispersant: choose husky rope wax as dispersant;
The preparation of S6, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry: get nanometer lithium phosphate powder 35%, aluminium powder 50% according to percentage by weight; Organic carrier: 9%; Binding material: 2%; Solvent: 2%; Dispersant: 2%, after mixing in the planetary stirring machine, be dispersed to particle mean size＜below the 1.0 μ m on the three-roller again, can make phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry.
Embodiment four～embodiment ten:
A kind of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry and preparation method thereof; The composition of this slurry is with embodiment one～embodiment three; The step of its preparation method is also with embodiment one～embodiment three; Institute's difference is: the percentage by weight of each composition of described phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry changes to some extent, specifically changes referring to subordinate list one; Simultaneously, the percentage by weight of each composition of binding material also changes to some extent, specifically changes referring to subordinate list two.
As a kind of conversion of embodiment one～embodiment ten, described organic carrier generally is 30～40% ethyl cellulose resin to be dissolved in 60～70% the organic solvent form; And generally be the Water Tank with Temp.-controlled that places 80～90oC, ethyl cellulose resin is dissolved in the organic solvent fully.
Another conversion as embodiment one～embodiment ten; In the preparation method of phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry; In the preparation of step S2, binding material, described in high temperature furnace heat-retaining condition generally be: under 380～480oC the insulation 20～30 minutes.
Test Example:
Carry on the back each item performance of electric field slurry in order to verify the present invention's phosphorous environment-protecting asepsis polysilicon solar cell; The inventor randomly draws three batches sample and makes an experiment; Its result of the test is respectively referring to subordinate list three; This shows that each item performance of the present invention's phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry all is superior to conventional polysilicon solar cell back of the body electric field slurry.
Claims (9)
1. a phosphorous environment-protecting asepsis polysilicon solar cell is carried on the back the electric field slurry, and it is characterized in that: the composition of this slurry and percentage by weight are: nanometer lithium phosphate powder 20～35%, aluminium powder 50～68%; Organic carrier: 8～16%; Binding material: 0.5～6%; Solvent: 2～15%; Dispersant: 0.2～2.2%, the weight summation of above-mentioned each composition is 100%.
2. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 1 is characterized in that: the particle diameter＜40nm of said nanometer lithium phosphate powder, the particle diameter of aluminium powder＜1.0 μ m.
3. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 1 is characterized in that: described organic carrier is 30～40% ethyl cellulose resin to be dissolved in 60～70% the organic solvent to form by weight percentage.
4. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 2, it is characterized in that: the organic solvent in the described organic carrier is the propane diols butyl ether.
5. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 1, it is characterized in that: described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：25～35%， Bi
2O
3：35～55%， Al
2O
3：0～5%， SiO
2：0.05～5%，
TiO
2：0～5%， NiO：0.05～4%， ZnO：15～35%，?Ga
2O
3：0.5～10%，
La
2O
3：0.05～3%，?LiFePO
4:0.5～5%，
The weight summation of the composition of above-mentioned binding material is 100%.
6. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 5 is characterized in that: described B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤5nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm.
7. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 1, it is characterized in that: described solvent is the terephthalic acid (TPA) dibutyl ester.
8. phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry according to claim 1, it is characterized in that: described dispersant is husky rope wax.
9. the preparation method of a phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry, it is characterized in that: this method may further comprise the steps:
S1, choose the nanometer lithium phosphate powder of particle diameter＜40nm; Choose the aluminium powder of particle diameter＜1.0 μ m;
The preparation of S2, binding material:
S2.1, choose nano oxidized raw material by following particle diameter:
B
2O
3Particle diameter≤80nm, Bi
2O
3Particle diameter≤80nm, Al
2O
3Particle diameter≤20nm, SiO
2Particle diameter≤30nm, TiO
2Particle diameter≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2O
3Particle diameter≤80nm, La
2O
3Particle diameter≤40nm, LiFePO
4Particle diameter≤40nm;
S2.2, take by weighing each by following percentage by weight and chosen the nano oxidized raw material of particle diameter:
B
2O
3：25～35%， Bi
2O
3：35～55%， Al
2O
3：0～5%， SiO
2：0.05～5%，
TiO
2：0～5%， NiO：0.05～4%， ZnO：15～35%，?Ga
2O
3：0.5～10%，
La
2O
3：0.05～3%，?LiFePO
4:?0.5～5%，
The weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, each nano-oxide raw materials mix is passed in the high temperature furnace after evenly, insulation is 20-30 minute under 380-480oC, carries out ball milling after quenching with deionized water subsequently, and mistake 400 mesh sieves are promptly processed binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30～40% is added in 60～70% the organic solvent by weight percentage, and this organic solvent is the propane diols butyl ether; Place the Water Tank with Temp.-controlled of 80～90oC then, ethyl cellulose resin is dissolved in the organic solvent fully, promptly obtain organic carrier after filtering;
The preparation of S4, solvent: choose the terephthalic acid (TPA) dibutyl ester as solvent;
S5: the preparation of dispersant: choose husky rope wax as dispersant;
The preparation of S6, phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry: get 20～35% nanometer lithium phosphate powder, get 50～68% aluminium powder, 8～16% organic carrier, 0.5～6% binding material, 2～15% solvent, 0.2～2.2% dispersant according to percentage by weight; After mixing in the planetary stirring machine; Be dispersed to particle mean size＜below the 1.0 μ m on the three-roller again, can making phosphorous environment-protecting asepsis polysilicon solar cell back of the body electric field slurry.
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