CN103617821A - Solar cell aluminum-back paste with low printing wet weight - Google Patents
Solar cell aluminum-back paste with low printing wet weight Download PDFInfo
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- CN103617821A CN103617821A CN201310621286.0A CN201310621286A CN103617821A CN 103617821 A CN103617821 A CN 103617821A CN 201310621286 A CN201310621286 A CN 201310621286A CN 103617821 A CN103617821 A CN 103617821A
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Abstract
The invention relates to solar cell aluminum-back paste with low printing wet weight. The solar cell aluminum-back paste comprises, by weight, 60-78% of aluminum powder, 0.5-7% of lead-free glass powder, 20-39.4% of organic carriers and 0.1-5% of alloy powder. The alloy powder comprises silicon, aluminum and third metal, the melting point of the third metal is 577 DEG C, and the silicon accounts for, by weight, smaller than or equal to 18%. The solar cell aluminum-back paste has the advantages that production cost of solar cells is lowered, and meanwhile generation of aluminum bracts under the low printing wet weight condition can be restrained. In addition, the rare earth element can be added in the alloy powder, trace rare earth element can improve alloy crystal particles, the alloy performance can be more even, and an obtained aluminum membrane through sintering can be more even in performance.
Description
Technical field
The present invention relates to a kind of electrocondution slurry, be specifically related to a kind of solar cell back aluminum slurry of low printing weight in wet base.
Background technology
It is one important operation in manufacture of solar cells technique that back of the body electric field is made.When manufacturing crystal silicon solar energy battery, utilize silk screen aluminium paste to be printed on to the back side of silicon chip, through super-dry, sintering, the technique such as cooling, can be formed on and between silicon substrate and aluminium lamination, form silicon-aluminum alloy layer, to eliminate the Schottky barrier between silicon chip and electrode, realize good ohmic contact, and form the silicon epitaxial layer doped with aluminium on cooled silicon chip, be back surface field layer, to improve the open circuit voltage of battery and to improve photoelectric conversion efficiency.Therefore properties of product and the conversion efficiency of aluminium paste are in close relations.
A high-quality and efficient aluminium paste product, it is high that cost performance is wanted.Reduce the cost of aluminium paste, one of main path is to reduce printing weight in wet base.In addition, because the coefficient of expansion of silicon and aluminium has big difference, excessive printing weight in wet base can increase the warpage of cell piece after sintering; And current development trend is that the silicon wafer thickness that uses is more and more thinner, the thin silicon sheet warping phenomenon therefore bringing is thus by even more serious.Reduce aluminium paste cost and overcome the printing weight in wet base that silicon warp phenomenon all requires to reduce aluminium paste as far as possible.But the printing weight in wet base that reduces aluminium paste easily causes aluminium bud to produce.Back-surface-field (BSF) paste prints too thinly, and local too much silicon is dissolved in aluminium.Energy spectrum analysis has also illustrated that aluminium bud is for solid, and the silicone content at aluminium bud place is greater than the silicone content at flat surface place.
Therefore,, for low printing weight in wet base solar cell back aluminum slurry, how to eliminate aluminium bud most important.
Summary of the invention
The technical issues that need to address of the present invention are to overcome the deficiencies in the prior art, and a kind of solar cell back aluminum slurry of low printing weight in wet base is provided, and the aluminium film being obtained by this slurry is difficult for producing aluminium bud.
The technical issues that need to address of the present invention are achieved through the following technical solutions:
A solar cell back aluminum slurry for low printing weight in wet base, its component by weight percentage calculating comprises:
Aluminium powder 60 ~ 78%
Lead-free glass powder 0.5 ~ 7%
Organic carrier 20 ~ 39.4%
Alloy powder 0.1 ~ 5%;
Wherein said alloy powder comprises silicon, aluminium and the 3rd metal, the fusing point <577 ℃ of the 3rd metal, percetage by weight content≤18% of silicon.The 3rd metal that adds <577 ℃ of fusing point can reduce the eutectic temperature of silicon-aluminum powder; In the sintering process of back aluminum slurry, this alloy powder can be before the eutectic temperature that reaches silicon substrate and aluminium powder, the fusing point Flow Structure Nearby of this alloy, to silicon substrate surface, forms the major part of aluminium back surface field or aluminium back surface field.By contrast, add the back aluminum slurry of conventional silicon-aluminum, silicon substrate and aluminium powder need to be heated at least 577 ℃ of temperature and just start the interface generation congruent melting contacting at it, and the silicon-aluminum adding also need to and flow to into silicon substrate surface subsequently in the melting of at least 577 ℃ of ability, therefore conventional silicon-aluminum can not be supplemented to the interface of silicon substrate in time, to suppress the generation of aluminium bud in low printing weight in wet base situation.
Preferably described the 3rd metal is zinc or tin.Preferably, the composition of described alloy powder comprises by its percetage by weight: silicon 0.1 ~ 18%, aluminium 75 ~ 99.80% and zinc or tin 0.1 ~ 7%.
Preferred described alloy powder also comprises at least one rare earth element.Preferably, the composition of described alloy powder comprises by its percetage by weight: silicon 0.1 ~ 18%, aluminium 75 ~ 99.79%, zinc or tin 0.1 ~ 6.5% and rare earth element 0.01 ~ 0.5%.The rare earth element of trace can improve alloy grain, make alloy property more even, and then the aluminium film properties that sintering is obtained is more even.
Preferably, the component of described organic carrier is calculated and is comprised according to percetage by weight: 50 ~ 70% organic solvents, 5 ~ 20% binding agents, 1 ~ 10% levelling agent, 1 ~ 5% surfactant, surplus are wetting dispersing agent.
More preferably, described organic solvent is a kind of in terpinol, butyl acetate, propylene glycol, butyl glycol ether, methoxypropanol and diisobutyl ketone; Described binding agent is a kind of in ethyl cellulose, CMC, nitrocellulose, acrylic resin, alkyd resins and abietic resin; Described levelling agent is a kind of in triethanolamine, polyethyl acrylate, butyl polyacrylate, polyacrylic acid 2-Octyl Nitrite, ethyl acrylate and butyl acrylate copolymer and silicone-modified polyacrylate; Described surfactant is a kind of in lecithin, glycerin monostearate, polysorbate and oleic acid; Described wetting dispersing agent is a kind of in modification acrylate block interpolymers, long-chain polyamine acid amides, unsaturated polybasic carboxylic acid polymer and modified polyorganosiloxane copolymer.Adjuvant used system can be improved wettability, reduces process of lapping required time and makes slurry decentralized stabilization, can also reduce system viscosity, has improved mobility.
More preferably, the particle diameter of described lead-free glass powder is 1.3 ~ 1.6 μ m, and the particle diameter of described aluminium powder is 1.3 ~ 2.6 μ m.The particle diameter that reduces aluminium powder and lead-free glass powder can improve liquidity, and in low printing weight in wet base situation, is conducive to avoid the generation of aluminium bud.
More preferably, the component of described lead-free glass powder comprises by its percetage by weight: 5 ~ 15%B
2o
3, 50 ~ 70%Bi
2o
3, 0 ~ 2%Al
2o
3, 2 ~ 8%ZnO, 1 ~ 10%Na
2o, 15.5 ~ 29%SiO
2, 0.5 ~ 5%MoO
3, 0 ~ 5%ZrO
2, wherein each component weight percentage sum of glass dust is 100%; And it is that surface is through the lead-free glass powder of coupling agent treatment.
Compared with prior art, advantage of the present invention and beneficial effect are:
1, solar cell back aluminum slurry of the present invention is applicable to low printing weight in wet base, has reduced the production cost of solar battery sheet, can also suppress the generation of aluminium bud in low printing weight in wet base situation simultaneously.
2, the solar cell back aluminum slurry of the low printing weight in wet base of the present invention has also adopted the alloy powder that comprises silicon, aluminium, the 3rd metal and rare earth element, the rare earth element of trace can improve alloy grain, make alloy property more even, and then the aluminium film properties that sintering is obtained is more even.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Embodiment 1
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 60% of 1.3 ~ 2.6 μ m, lead-free glass powder 0.5%, organic carrier 39.4%, the alloy powder 0.1% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 5%B
2o
3, 70%Bi
2o
3, 8%ZnO, 1%Na
2o, 15.5%SiO
2, 0.5%MoO
3.The component of organic carrier is calculated and is comprised according to percetage by weight: 50% terpinol, 20% CMC, 10% triethanolamine, 1% lecithin, 19% modification acrylate block interpolymers.The composition of alloy powder comprises by its percetage by weight: silicon 18%, aluminium 75% and zinc 7%.
Embodiment 2
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 65% of 1.3 ~ 2.6 μ m, lead-free glass powder 7%, organic carrier 23%, the alloy powder 5% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 15%B
2o
3, 50%Bi
2o
3, 2%Al
2o
3, 2%ZnO, 1%Na
2o, 29%SiO
2, 0.5%MoO
3, 0.5%ZrO
2; And it is that surface is through the lead-free glass powder of coupling agent treatment.The component of organic carrier is calculated and is comprised according to percetage by weight: 70% butyl acetate, 5% ethyl cellulose, 1% ethyl acrylate, 5% oleic acid, 19% long-chain polyamine acid amides.The composition of alloy powder comprises by its percetage by weight: silicon 0.1%, aluminium 99.8% and tin 0.1%.
Embodiment 3
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 78% of 1.3 ~ 2.6 μ m, lead-free glass powder 1%, organic carrier 20%, the alloy powder 1% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 6%B
2o
3, 53%Bi
2o
3, 1%Al
2o
3, 3%ZnO, 10%Na
2o, 17%SiO
2, 5%MoO
3, 5%ZrO
2; And it is that surface is through the lead-free glass powder of coupling agent treatment.The component of organic carrier is calculated and is comprised according to percetage by weight: 65% propylene glycol, 15% nitrocellulose, 7% butyl polyacrylate, 3 glycerin monostearates, unsaturated polybasic carboxylic acid polymer.The composition of alloy powder comprises by its percetage by weight: silicon 1.2%, aluminium 97% and zinc 1.8%.
Embodiment 4
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 60% of 1.3 ~ 2.6 μ m, lead-free glass powder 0.5%, organic carrier 39.4%, the alloy powder 0.1% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 7%B
2o
3, 60%Bi
2o
3, 1.5%Al
2o
3, 3%ZnO, 1.5%Na
2o, 25%SiO
2, 1%MoO
3, 1%ZrO
2; And it is that surface is through the lead-free glass powder of coupling agent treatment.The component of organic carrier is calculated and is comprised according to percetage by weight: 60% butyl glycol ether, 15% acrylic resin, 5% polyacrylic acid 2-Octyl Nitrite, 3% glycerin monostearate, 15% modified polyorganosiloxane copolymer.The composition of alloy powder comprises by its percetage by weight: silicon 18%, aluminium 75%, zinc 6.5% and La0.5%.
Embodiment 5
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 65% of 1.3 ~ 2.6 μ m, lead-free glass powder 7%, organic carrier 23%, the alloy powder 5% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 6%B
2o
3, 64%Bi
2o
3, 1%Al
2o
3, 3%ZnO, 2%Na
2o, 20%SiO
2, 2%MoO
3, 2%ZrO
2; And it is that surface is through the lead-free glass powder of coupling agent treatment.The component of organic carrier is calculated and is comprised according to percetage by weight: 70% methoxypropanol, 5% alkyd resins, 1% ethyl acrylate and butyl acrylate copolymer, 1% polysorbate, 23% modified polyorganosiloxane copolymer.The composition of alloy powder comprises by its percetage by weight: silicon 0.1%, aluminium 99.79%, tin 0.1% and Ce0.01%.
Embodiment 6
The present invention is a kind of solar cell back aluminum slurry of low printing weight in wet base, and its component by weight percentage calculating comprises: particle diameter is the aluminium powder 78% of 1.3 ~ 2.6 μ m, lead-free glass powder 1%, organic carrier 20%, the alloy powder 1% that particle diameter is 1.3 ~ 1.6 μ m.Wherein, the component of lead-free glass powder comprises by its percetage by weight: 7%B
2o
3, 65%Bi
2o
3, 1%Al
2o
3, 4%ZnO, 3%Na
2o, 18%SiO
2, 1%MoO
3, 1%ZrO
2; And it is that surface is through the lead-free glass powder of coupling agent treatment.The component of organic carrier is calculated and is comprised according to percetage by weight: 50% diisobutyl ketone, 20% abietic resin, 10% silicone-modified polyacrylate, 5% oleic acid, 15% modified polyorganosiloxane copolymer.The composition of alloy powder comprises by its percetage by weight: silicon 1.2%, aluminium 96.95%, zinc 1.8% and La0.05%.
Comparative example 1
Except replacing the alloy powder in embodiment 1 last reign of a dynasty with conventional silicon aluminium alloy powder, according to the formula preparation in embodiment 1, compare slurry, the composition of alloy powder comprises silicon 18% and aluminium 92% by its percetage by weight.
After back aluminum slurry that above-described embodiment 1 ~ 6 formula and comparative example 1 are made is on probation on monocrystalline 125 silicon chips, printing weightening finish 0.6 ± 0.1g is dried under the temperature conditions of 200 ~ 240 ℃, is sintering under the condition of 830 ℃ at sintering peak value.Finding, there are some aluminium buds in the aluminium film surface being obtained by the back aluminum slurry printing of comparative example 1, and the aluminium film surface that embodiment 1 ~ 6 back aluminum slurry printing obtains is not all found aluminium bud.The aluminium film electrical property that the back aluminum slurry printing of being filled a prescription by embodiment 4 ~ 6 in addition, obtains is more even.
Above-mentioned each embodiment is further illustrating that foregoing of the present invention is made, but the scope that should not be construed as the above-mentioned theme of the present invention only limits to above-described embodiment.It should be pointed out that for those skilled in the art, not departing under the prerequisite of 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 (10)
1. a solar cell back aluminum slurry for low printing weight in wet base, is characterized in that, its component by weight percentage calculating comprises:
Aluminium powder 60 ~ 78%
Lead-free glass powder 0.5 ~ 7%
Organic carrier 20 ~ 39.4%
Alloy powder 0.1 ~ 5%;
Wherein said alloy powder comprises silicon, aluminium and the 3rd metal, the fusing point <577 ℃ of the 3rd metal, percetage by weight content≤18% of silicon.
2. the heavy solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 1, is characterized in that, described the 3rd metal is zinc or tin.
3. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 2, is characterized in that, the composition of described alloy powder comprises by its percetage by weight: silicon 0.1 ~ 18%, aluminium 75 ~ 99.80% and zinc or tin 0.1 ~ 7%.
4. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 2, is characterized in that, described alloy powder also comprises at least one rare earth element.
5. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 4, it is characterized in that, the composition of described alloy powder comprises by its percetage by weight: silicon 0.1 ~ 18%, aluminium 75 ~ 99.79%, zinc or tin 0.1 ~ 6.5% and rare earth element 0.01 ~ 0.5%.
6. the solar cell back aluminum slurry of the low printing weight in wet base as described in claim 1 to 5 any one, it is characterized in that, the component of described organic carrier is calculated and is comprised according to percetage by weight: 50 ~ 70% organic solvents, 5 ~ 20% binding agents, 1 ~ 10% levelling agent, 1 ~ 5% surfactant, surplus are wetting dispersing agent.
7. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 6, is characterized in that: described organic solvent is a kind of in terpinol, butyl acetate, propylene glycol, butyl glycol ether, methoxypropanol and diisobutyl ketone; Described binding agent is a kind of in ethyl cellulose, CMC, nitrocellulose, acrylic resin, alkyd resins and abietic resin.
8. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 6, is characterized in that: described levelling agent is a kind of in triethanolamine, polyethyl acrylate, butyl polyacrylate, polyacrylic acid 2-Octyl Nitrite, ethyl acrylate and butyl acrylate copolymer and silicone-modified polyacrylate; Described surfactant is a kind of in lecithin, glycerin monostearate, polysorbate and oleic acid; Described wetting dispersing agent is a kind of in modification acrylate block interpolymers, long-chain polyamine acid amides, unsaturated polybasic carboxylic acid polymer and modified polyorganosiloxane copolymer.
9. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 6, is characterized in that, the particle diameter of described lead-free glass powder is 1.3 ~ 1.6 μ m, and the particle diameter of described aluminium powder is 1.3 ~ 2.6 μ m.
10. the solar cell back aluminum slurry of low printing weight in wet base as claimed in claim 9, is characterized in that, the component of described lead-free glass powder comprises by its percetage by weight: 5 ~ 15%B
2o
3, 50 ~ 70%Bi
2o
3, 0 ~ 2%Al
2o
3, 2 ~ 8%ZnO, 1 ~ 10%Na
2o, 15.5 ~ 29%SiO
2, 0.5 ~ 5%MoO
3, 0 ~ 5%ZrO
2, wherein each component weight percentage sum of glass dust is 100%; And it is that surface is through the lead-free glass powder of coupling agent treatment.
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| CN201310621286.0A CN103617821B (en) | 2013-11-29 | 2013-11-29 | A kind of solaode back aluminum slurry of low printing weight in wet base |
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| CN106928497A (en) * | 2017-02-20 | 2017-07-07 | 江苏瑞德新能源科技有限公司 | A kind of electrode of solar battery organic carrier and preparation method thereof |
| CN107240437A (en) * | 2017-06-30 | 2017-10-10 | 江苏瑞德新能源科技有限公司 | A kind of passivation emitter solar cell aluminium paste |
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| CN103617821B (en) | 2016-08-17 |
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