CN102569439B - Environment-friendly and non-toxic crystalline silicon solar cell back surface field paste and preparation method thereof - Google Patents
Environment-friendly and non-toxic crystalline silicon solar cell back surface field paste and preparation method thereof Download PDFInfo
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Abstract
The invention discloses environment-friendly and non-toxic crystalline silicon solar cell back surface field paste and a preparation method thereof and relates to cell back surface field paste and a preparation method thereof. The paste comprises the following components in percentage by weight: 20 to 50 percent of nano boron conductive powder, 35 to 65 percent of aluminum conductive powder, 8 to 16 percent of organic carrier, 0.5 to 6 percent of binder, 2 to 15 percent of solvent and 0.2 to 2.2 percent of dispersing agent. The preparation method comprises the following steps of: 1, selecting the boron conductive powder and the aluminum conductive powder; 2, preparing the binder; 3, preparing the organic carrier; 4, preparing the solvent; 5, preparing the dispersing agent; and 6, preparing the non-toxic back surface field paste. The quality of the paste accords with relevant regulation, the paste does not contain Pb, Cd and other toxic substances, the problem of environmental pollution caused by the conventional Pb-containing back surface field silver aluminum paste is really solved, and the invention has the characteristics that: a cell has high photoelectric conversion efficiency and high electric properties, the sintering temperature of the binder can be reduced, and the paste is low in cost and easy to produce in batches.
Description
Technical field
The present invention relates to a kind of battery back electric field slurry and preparation method thereof, particularly a kind of environment-protecting asepsis crystal silicon solar battery back electric field slurry and preparation method thereof.
Background technology
Energy problem has become 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, the utilization of solar energy source is just with annual more than 50% speed rapid growth, wherein solar cell is the important devices that solar energy is converted into electric energy, in photovoltaic generation, be still and take crystal silicon solar energy battery as main at present, occupy 90% left and right of whole market share.And back of the body electric field slurry is the important materials of rear electrode for crystal silicon solar battery, it can pass through the methods such as evaporation, sputter and silk screen printing, at the silicon chip back side of crystal silicon solar energy battery, forms back electrode grid line firm, low ohm contact resistance.Domestic year use amount of nearly 2 years back of the body electric field slurries reached 160 tons of left and right, and the equal rapid growth of volume of production and marketing.But, because these slurry ubiquities are containing noxious substances such as Pb, increasing to the pollution of environment, the sustainable development of photovoltaic industry has been produced to certain impact.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 solar battery back electric field slurry of a kind of six materials not forbidding containing RoHS Directive and preparation method thereof, but there is following shortcoming in this patent application: (1), battery back electric field weak strength, and cell photoelectric conversion efficiency is not high; (2), the preparation process of binding material is to carry out under the condition of 900-1200 ℃, temperature retention time is 30-60 minute simultaneously, and the slurry particle mean size≤10 μ m of final preparation; Due to temperature drift in the preparation process of slurry, and temperature retention time is longer, these high temperature links will cause solar cell electric property to reduce or amplification not obvious; In addition the slurry particle diameter making, is thick also can be on the absorption of light or reflection impact to some extent.
Summary of the invention
The technical problem to be solved in the present invention is: provide environment-protecting asepsis type crystal silicon solar battery back electric field slurry of a kind of boracic and preparation method thereof, with the weak point that solves exist in above-mentioned prior art big for environment pollution, cell photoelectric conversion efficiency is not high, battery electric property reduces.
The technical scheme solving the problems of the technologies described above is: a kind of environment-protecting asepsis crystal silicon solar battery back electric field slurry, and the composition of this slurry and percentage by weight are: nanometer boron conducting powder 20～50%, aluminium conducting powder 35～65%; 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: described nanometer boron conducting powder is the pure nanometer boron of particle diameter < 100nm; The particle diameter of aluminium conducting powder is < 1.0 μ m.
Described organic carrier is by weight percentage 30～40% ethyl cellulose resin to be dissolved in 60～70% organic solvent to form.
Organic solvent in described organic carrier is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight.
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2o
3(boron oxide): 25～35%, Bi
2o
3(bismuth oxide): 35～55%, Al
2o
3(aluminium oxide): 0～5%, SiO
2(silicon dioxide): 0.05～5%, TiO
2(titanium dioxide): 0～5%, NiO(nickel oxide): 0.05～4%, ZnO(zinc oxide): 15～35%, Ga
2o
3(gallium oxide): 0.5～10%, La
2o
3(lanthana): 0.05～3%, CeO
2(ceria): 0.5～6%;
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≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2o
3particle diameter≤80nm, La
2o
3particle diameter≤40nm, CeO
2particle diameter≤20nm.
Described solvent is one or more mixtures that mix with arbitrary proportion that are selected from terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl.
Described dispersant is OPE.
Another technical scheme of the present invention is: a kind of preparation method of environment-protecting asepsis crystal silicon solar battery back electric field slurry, and the method comprises the following steps:
S1, choose particle diameter < 100nm pure nanometer boron as nanometer boron conducting powder; Choose the aluminium conducting powder of particle diameter < 1.0 μ m;
The preparation of S2, binding material:
S2.1, by following particle diameter, choose nano oxidized raw material:
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, CeO
2particle diameter≤20nm;
S2.2, by following percentage by weight, take each 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%, CeO
2: 0.5～6%, the weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, be passed in high temperature furnace after each nano oxidized raw material is mixed, under 380-480oC, be incubated 20-30 minute, after quenching with deionized water subsequently, carry out ball milling, cross 400 mesh sieves, make binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30～40% is added in 60～70% organic solvent by weight percentage, and this organic solvent is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; Then be placed in the Water Tank with Temp.-controlled of 80～90oC, ethyl cellulose resin is dissolved in organic solvent completely, obtain after filtering organic carrier;
The preparation of S4, solvent: one or more in terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl are mixed with arbitrary proportion, make solvent;
S5: the preparation of dispersant: choose OPE as dispersant;
The preparation of S6, environment-protecting asepsis crystal silicon solar battery back electric field slurry: get 20～50% nanometer boron conducting powder, get 35～65% aluminium conducting 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 planetary stirring machine, on three-roller, be dispersed to again below particle mean size < 1.0 μ m, can make environment-protecting asepsis crystal silicon solar battery back electric field slurry.
Owing to adopting technique scheme, environment-protecting asepsis crystal silicon solar battery back electric field slurry of the present invention and preparation method thereof compared with prior art, has following beneficial effect:
1, can solve with the problem of environmental pollution causing containing Pb back electric field silver aluminum slurry:
In composition due to the present invention's environment-protecting asepsis crystal silicon solar battery back electric field slurry, do not contain 6 kinds of noxious substances such as Pb, Cd, Hg, Cr (Vl), Polybrominated biphenyl PBB, Poly Brominated Diphenyl Ethers PBDE, stock quality meets the RoHS of European Union about the regulation of the instruction 2005/84/EC of phthalic acid ester, has really solved the problem of environmental pollution causing containing Pb back electric field silver aluminum slurry for current photovoltaic industry.
2, cell photoelectric conversion efficiency is high:
In the present invention's environment-protecting asepsis crystal silicon solar battery back electric field slurry, the content of boron reaches 20～50%, because the diffusion concentration of boron is than the equal high order of magnitude of silver, aluminium, therefore, the slurry of boracic is more conducive to the enhancing of solar battery back electric field intensity, be easier to improve battery surface field passivation level, thereby obtain lower light reflectivity and the absorptivity of Geng Gao, cell photoelectric conversion efficiency is improved more remarkable.
3, the electric property of battery is better:
In environment-protecting asepsis crystal silicon solar battery back electric field slurry of the present invention and preparation method thereof, boron conducting powder is to adopt nanometer boron conducting powder, 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 crystal 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, CeO
2substitute traditional coarse grain material CaO, NiO
2, Li
2o, V
2o
5deng, its role is to: the one, can make the sintering temperature of binding material preparation process reduce 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) is conducive to the improvement of solar cell dielectric property, ceria (CeO
2) play good catalytic action.
4, cost low, be easy to batch production:
In composition due to the present invention's environment-protecting asepsis crystal silicon solar battery back electric field slurry, the binding material that includes nanometer boron conducting powder and prepared by nano-oxide, these nano materials are domestic to be produced in enormous quantities, price is also lower, be easy to produce in batches the present invention's slurry, be also conducive to realize the target of crystal silicon solar energy battery cost, production scale expansion.
Below, in conjunction with specific embodiments the technical characterictic of environment-protecting asepsis crystal silicon solar battery back electric field slurry of the present invention and preparation method thereof is further described.
Specific embodiment
Embodiment mono-:
A crystal silicon solar battery back electric field slurry, the composition of this slurry and percentage by weight are: nanometer boron conducting powder 20%, aluminium conducting powder 65%; Organic carrier: 8%; Binding material: 0.5%; Solvent: 5%; Dispersant: 1.5%.
Wherein, described nanometer boron conducting powder is the pure nanometer boron of particle diameter < 100nm; The particle diameter of aluminium conducting powder is < 1.0 μ m;
Described organic carrier is by weight percentage 30% ethyl cellulose resin to be dissolved in 70% organic solvent to form; Organic solvent in this organic carrier is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight;
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
2：1%， NiO：0.05%， ZnO：15%， Ga
2O
3：2%，
La
2O
3：0.9%， CeO
2：1%；
And above-mentioned 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, CeO
2particle diameter≤20nm.
Described solvent is the mixture that terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan mix with arbitrary proportion; Described dispersant is OPE.
The preparation method of above-mentioned environment-protecting asepsis crystal silicon solar battery back electric field slurry comprises the following steps:
S1, choose particle diameter < 100nm pure nanometer boron as nanometer boron conducting powder; Choose the aluminium conducting powder of particle diameter < 1.0 μ m;
The preparation of S2, binding material:
S2.1, by following particle diameter, choose nano oxidized raw material:
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, CeO
2particle diameter≤20nm;
S2.2, by following percentage by weight, take each 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
2：1%，NiO：0.05%， ZnO：15%，Ga
2O
3：2%，La
2O
3：0.9%，CeO
2：1%；
S2.3, be passed in high temperature furnace after each nano oxidized raw material is mixed, under 380oC, be incubated 30 minutes, after quenching with deionized water subsequently, carry out ball milling, cross 400 mesh sieves, make binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30% is added in 65% organic solvent by weight percentage, and this organic solvent is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; Then be placed in the Water Tank with Temp.-controlled of 80～90oC, ethyl cellulose resin is dissolved in organic solvent completely, obtain after filtering organic carrier;
The preparation of S4, solvent: terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan are mixed with arbitrary proportion, make solvent;
S5: the preparation of dispersant: choose OPE as dispersant;
The preparation of S6, environment-protecting asepsis crystal silicon solar battery back electric field slurry: get 20% nanometer boron conducting powder, get 65% aluminium conducting powder, 8% organic carrier, 0.5% binding material, 5% solvent, 1.5% dispersant according to percentage by weight, after mixing in planetary stirring machine, on three-roller, be dispersed to again below particle mean size < 1.0 μ m, can make environment-protecting asepsis crystal silicon solar battery back electric field slurry.
Embodiment bis-:
A crystal silicon solar battery back electric field slurry, the composition of this slurry and percentage by weight are: nanometer boron conducting powder 35%, aluminium conducting powder 50%; Organic carrier: 10%; Binding material: 2.8%; Solvent: 2%; Dispersant: 0.2%, the weight summation of above-mentioned each composition is 100%.
Wherein, described nanometer boron conducting powder is the pure nanometer boron of particle diameter < 100nm; The particle diameter of aluminium conducting powder is < 1.0 μ m;
Described organic carrier is by weight percentage 40% ethyl cellulose resin to be dissolved in 60% organic solvent to form, and the organic solvent in this organic carrier is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight;
Described binding material is nano-oxide, and the composition of this binding material and percentage by weight are:
B
2O
3：30%， Bi
2O
3：40%， Al
2O
3：2.5%， SiO
2：2.5%，
TiO
2：2%， NiO：1%， ZnO：15%， Ga
2O
3：5%，
La
2O
3：1%， CeO
2：1%；
And above-mentioned 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, CeO
2particle diameter≤20nm.
Described solvent is terephthalic acid (TPA) dibutyl ester; Described dispersant is OPE.
The preparation method of above-mentioned environment-protecting asepsis crystal silicon solar battery back electric field slurry comprises the following steps:
S1, choose particle diameter < 100nm pure nanometer boron as nanometer boron conducting powder; Choose the aluminium conducting powder of particle diameter < 1.0 μ m;
The preparation of S2, binding material:
S2.1, by following particle diameter, choose nano oxidized raw material:
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, CeO
2particle diameter≤20nm;
S2.2, by following percentage by weight, take each and chosen the nano oxidized raw material of particle diameter:
B
2O
3：30%，Bi
2O
3：40%，Al
2O
3：2.5%，SiO
2：2.5%，TiO
2：2%，NiO：1%，ZnO：15%，Ga
2O
3：5%，La
2O
3：1%，CeO
2：1%；
S2.3, be passed in high temperature furnace after each nano oxidized raw material is mixed, under 430oC, be incubated 25 minutes, after quenching with deionized water subsequently, carry out ball milling, cross 400 mesh sieves, make binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 40% is added in 60% organic solvent by weight percentage, and this organic solvent is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; Then be placed in the Water Tank with Temp.-controlled of 80～90oC, ethyl cellulose resin is dissolved in organic solvent completely, obtain after filtering organic carrier;
The preparation of S4, solvent: directly choose phthalic acid dibutyl ester as solvent;
S5: the preparation of dispersant: choose OPE as dispersant;
The preparation of S6, environment-protecting asepsis crystal silicon solar battery back electric field slurry: get nanometer boron conducting powder 35%, aluminium conducting powder 50% according to percentage by weight; Organic carrier: 10%; Binding material: 2.8%; Solvent: 2%; Dispersant: 0.2%, after mixing in planetary stirring machine, then on three-roller, be dispersed to below particle mean size < 1.0 μ m, can make environment-protecting asepsis crystal silicon solar battery back electric field slurry.
Embodiment tri-:
A crystal silicon solar battery back electric field slurry, the composition of this slurry and percentage by weight are: nanometer boron conducting powder 50%, aluminium conducting powder 35%; Organic carrier: 8%; Binding material: 0.5%; Solvent: 5%; Dispersant: 1.5%, the weight summation of above-mentioned each composition is 100%.
Wherein, described nanometer boron conducting powder is the pure nanometer boron of particle diameter < 100nm; The particle diameter of aluminium conducting powder is < 1.0 μ m;
Described organic carrier is by weight percentage 35% ethyl cellulose resin to be dissolved in 65% organic solvent to form; Organic solvent in described organic carrier is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; The composition of described binding material and percentage by weight are:
B
2O
3：35%， Bi
2O
3：35%， Al
2O
3：0%， SiO
2：0.05%，
TiO
2：2%， NiO：0.05%， ZnO：25%， Ga
2O
3：2%，
La
2O
3：0.4%， CeO
2：0.5%；
And above-mentioned 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, CeO
2particle diameter≤20nm.
The weight summation of the composition of above-mentioned binding material is 100%;
Described solvent is the mixture that phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl are mixed with arbitrary proportion; Described dispersant is OPE.
The preparation method of above-mentioned environment-protecting asepsis crystal silicon solar battery back electric field slurry comprises the following steps:
S1, choose particle diameter < 100nm pure nanometer boron as nanometer boron conducting powder; Choose the aluminium conducting powder of particle diameter < 1.0 μ m;
The preparation of S2, binding material:
S2.1, by following particle diameter, choose nano oxidized raw material:
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, CeO
2particle diameter≤20nm;
S2.2, by following percentage by weight, take each and chosen the nano oxidized raw material of particle diameter:
B
2O
3：35%，Bi
2O
3：35%，Al
2O
3：0%，SiO
2：0.05%，TiO
2：2%，NiO：0.05%， ZnO：25%，Ga
2O
3：2%，La
2O
3：0.4%，CeO
2：0.5%；
S2.3, be passed in high temperature furnace after each nano oxidized raw material is mixed, under 480oC, be incubated 20 minutes, after quenching with deionized water subsequently, carry out ball milling, cross 400 mesh sieves, make binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 35% is added in 65% organic solvent by weight percentage, and this organic solvent is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; Then be placed in the Water Tank with Temp.-controlled of 80～90oC, ethyl cellulose resin is dissolved in organic solvent completely, obtain after filtering organic carrier;
The preparation of S4, solvent: will mix with arbitrary proportion phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl, and make solvent;
S5: the preparation of dispersant: choose OPE as dispersant;
The preparation of S6, environment-protecting asepsis crystal silicon solar battery back electric field slurry: get nanometer boron conducting powder 50%, aluminium conducting powder 35% according to percentage by weight; Organic carrier: 8%; Binding material: 0.5%; Solvent: 5%; Dispersant: 1.5%, after mixing in planetary stirring machine, then on three-roller, be dispersed to below particle mean size < 1.0 μ m, can make environment-protecting asepsis crystal silicon solar battery back electric field slurry.
Embodiment tetra-～embodiment ten:
A kind of environment-protecting asepsis crystal silicon solar battery back electric field slurry and preparation method thereof, the composition of this slurry is with embodiment mono-～embodiment tri-, the step of its preparation method is also with embodiment mono-～embodiment tri-, institute's difference is: the percentage by weight of each composition of described environment-protecting asepsis crystal silicon solar battery back electric field slurry changes to some extent, specifically changes referring to subordinate list one; Meanwhile, 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 mono-～embodiment ten, described organic carrier is generally by weight percentage 30～40% ethyl cellulose resin to be dissolved in 60～70% organic solvent to form.
As another conversion of embodiment mono-～embodiment ten, described solvent is generally one or more mixtures that mix with arbitrary proportion that are selected from terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl.
Another conversion as embodiment mono-～embodiment ten, in the preparation method of environment-protecting asepsis crystal silicon solar battery back electric field slurry, the heat-retaining condition in high temperature furnace described in the preparation of step S2, binding material generally: under 380～480oC, be incubated 20～30 minutes.
Test example:
In order to verify the properties of the present invention's environment-protecting asepsis crystal silicon solar battery back electric field slurry and preparation method thereof, inventor randomly draws the sample of three batches and tests, its result of the test is respectively referring to subordinate list three, as can be seen here, the properties of the present invention's environment-protecting asepsis crystal silicon solar battery back electric field slurry is all better than conventional crystal silicon solar battery back electric field slurry.
Claims (6)
1. an environment-protecting asepsis crystal silicon solar battery back electric field slurry, is characterized in that: the composition of this slurry and percentage by weight are: nanometer boron conducting powder 20～50%, aluminium conducting powder 35～65%; Organic carrier: 8～16%; Binding material: 0.5～6%; Solvent: 2～15%; Dispersant: 0.2～2.2%, the percentage by weight summation of above-mentioned each composition is 100%; Described nanometer boron conducting powder is the pure nanometer boron of particle diameter < 100nm; The particle diameter of aluminium conducting powder is < 1.0 μ m;
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%， CeO
2：0.5～6%，
The percentage by 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≤35nm, particle diameter≤30nm of NiO, particle diameter≤30nm of ZnO, Ga
2o
3particle diameter≤80nm, La
2o
3particle diameter≤40nm, CeO
2particle diameter≤20nm.
2. environment-protecting asepsis crystal silicon solar battery back electric field slurry according to claim 1, is characterized in that: described organic carrier is by weight percentage 30～40% ethyl cellulose resin to be dissolved in 60～70% organic solvent to form.
3. environment-protecting asepsis crystal silicon solar battery back electric field slurry according to claim 2, is characterized in that: the organic solvent in described organic carrier is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight.
4. environment-protecting asepsis crystal silicon solar battery back electric field slurry according to claim 1, is characterized in that: described solvent is one or more mixtures that mix with arbitrary proportion that are selected from terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl.
5. environment-protecting asepsis crystal silicon solar battery back electric field slurry according to claim 1, is characterized in that: described dispersant is OPE.
6. a preparation method for environment-protecting asepsis crystal silicon solar battery back electric field slurry, is characterized in that: the method comprises the following steps:
S1, choose particle diameter < 100nm pure nanometer boron as nanometer boron conducting powder; Choose the aluminium conducting powder of particle diameter < 1.0 μ m;
The preparation of S2, binding material:
S2.1, by following particle diameter, choose nano oxidized raw material:
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, CeO
2particle diameter≤20nm;
S2.2, by following percentage by weight, take each 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%， CeO
2：0.5～6%，
The percentage by weight summation of above-mentioned each nano oxidized raw material is 100%;
S2.3, be passed in high temperature furnace after each nano oxidized raw material is mixed, under 380-480oC, be incubated 20-30 minute, after quenching with deionized water subsequently, carry out ball milling, cross 400 mesh sieves, make binding material;
The preparation of S3, organic carrier: ethyl cellulose resin 30～40% is added in 65～95% organic solvent by weight percentage, and this organic solvent is that propandiol butyl ether and terpinol are that 1:1 ratio mixes according to percentage by weight; Then be placed in the Water Tank with Temp.-controlled of 80～90oC, ethyl cellulose resin is dissolved in organic solvent completely, obtain after filtering organic carrier;
The preparation of S4, solvent: one or more in terephthalic acid (TPA) dibutyl ester, phthalic acid fat in two heptan, phthalic acid two isodecyl fat, phthalic acid Diisooctyl are mixed with arbitrary proportion, make solvent;
The preparation of S5, dispersant: choose OPE as dispersant;
The preparation of S6, environment-protecting asepsis crystal silicon solar battery back electric field slurry: get 20～50% nanometer boron conducting powder, get 35～65% aluminium conducting 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 planetary stirring machine, on three-roller, be dispersed to again below particle mean size < 1.0 μ m, can make environment-protecting asepsis crystal silicon solar battery back electric field slurry.
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| CN103280401B (en) * | 2013-05-23 | 2016-01-27 | 刘国钧 | A kind of preparation method of boron composition coated Si nano pulp and application thereof |
| CN103280491B (en) * | 2013-05-23 | 2015-11-04 | 苏州金瑞晨科技有限公司 | A kind of preparation method of polyborate nanometer silicon composite slurry and application thereof |
| CN107301887A (en) * | 2017-05-14 | 2017-10-27 | 成都才盖科技有限公司 | A kind of silver-colored conductive silver paste composition of the novel solar battery back of the body and preparation method |
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| CN101944555A (en) * | 2010-09-16 | 2011-01-12 | 浙江大学 | Al and B doped silicon solar cell back surface and preparation method thereof |
| CN102024856A (en) * | 2010-09-28 | 2011-04-20 | 彩虹集团公司 | Environment-friendly crystalline silicon solar-cell back surface field silver-aluminium paste and preparation method thereof |
| CN102169739A (en) * | 2011-02-25 | 2011-08-31 | 乐山新天源太阳能电力有限公司 | Nanometer aluminum paste for solar battery and manufacturing method thereof |
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| CN101944555A (en) * | 2010-09-16 | 2011-01-12 | 浙江大学 | Al and B doped silicon solar cell back surface and preparation method thereof |
| CN102024856A (en) * | 2010-09-28 | 2011-04-20 | 彩虹集团公司 | Environment-friendly crystalline silicon solar-cell back surface field silver-aluminium paste and preparation method thereof |
| CN102169739A (en) * | 2011-02-25 | 2011-08-31 | 乐山新天源太阳能电力有限公司 | Nanometer aluminum paste for solar battery and manufacturing method thereof |
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