CN103000251A - Solar cell silver-backed slurry with wide sintering process window - Google Patents
Solar cell silver-backed slurry with wide sintering process window Download PDFInfo
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- CN103000251A CN103000251A CN2012104465225A CN201210446522A CN103000251A CN 103000251 A CN103000251 A CN 103000251A CN 2012104465225 A CN2012104465225 A CN 2012104465225A CN 201210446522 A CN201210446522 A CN 201210446522A CN 103000251 A CN103000251 A CN 103000251A
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Abstract
The invention relates to solar cell silver-backed slurry with a wide sintering process window. The slurry is composed of, by weight, 45-55% of silver powder, 3-7% of lead-free silicon-free glass powder, 10-15% of organic binder, 20-40% of solvent, 0.1-5% of sintering promoter and balance of auxiliaries, wherein, the sliver powder is composed of, by weight, 50-80% of spherical silver powder and 20-50% of schistose silver powder. The silver-backed slurry adopts the silver powder with different sintering activities to be used with the lead-free silicon-free glass powder, and small amount of the sintering promoter is added, so that the silver powder of different sintering activities can realize forming of a compact silver-film structure within a wider sintering temperature range; the lead-free silicon-free glass powder is low in crystallization degree, so that dissolving, of the sliver powder, in a glass phase, within the wide sintering temperature range is promoted; and adding of certain amount of the sintering promoter can effectively avoid the sliver powder from self-coagulation to form silver bar, so that the silver-backed slurry has the wide sintering process window.
Description
Technical field
The present invention relates to a kind of electrocondution slurry, be specifically related to a kind of have wide sintering process window back silver paste of solar cell.
Background technology
Solar cell is a kind of semiconductor device that can convert solar energy into electrical energy.Back silver paste of solar cell is the chief component of solar cell electric slurry, and it mainly is to make back side main grid in manufacture of solar cells, plays the effect that the electric current that the aluminium back surface field is collected confluxes derives.Rear surface of solar cell silver slurry mainly is comprised of silver powder, organic bond, inorganic bond, solvent and auxiliary agent.Except the performance index such as the cost of back silver paste, conductivity, the width of sintering process window also is a key index investigating back silver paste, because it affects processing quality that cell piece produces and the yields of final finished solar battery sheet.Therefore, the back silver paste that prepare a kind of excellent performance, has a wide sintering process window has consisted of key technology main points in the manufacture of solar cells.
At present, back silver paste of solar cell uses the spherical or flake silver powder of single shape as the electric conductor of back silver paste.Being that 201110200935.0 Chinese patent is disclosed such as application number a kind ofly uses single flake silver powder to be the back silver paste of solar cell of electric conductor, and application number is that 201110297031.4 the disclosed a kind of spherical silver powder of 0.5-2 μ m that uses of Chinese patent is as the back silver paste of solar cell of electric conductor, because its contained silver powder sintering activity is single, the sintering process window of this class back silver paste is often narrower.By contrast, the solar cell positive silver paste has gradually adopted the mixture of spherical or flake silver powder as the electric conductor of silver slurry, be that the mixture of flake silver powder of the disclosed a kind of granular silver powder that uses 0.1-2 μ m of 201110201638.8 Chinese patent and 3-10 μ m is as the solar cell positive silver paste of electric conductor such as application number, wherein, spherical have different sintering activities with flake silver powder, and corresponding gained silver slurry has wider sintering process window.But the glass dust that adopts in this class positive silver paste at present still mostly is siliceous glass dust, and the siliceous glass dust thermal coefficient of expansion of this class is lower, but the crystallization degree is high.This crystallization can make the sintering process windows narrow of silver slurry, the parameter change that is sintering process easily causes the minimizing that silver powder dissolves in glassy phase, and then cause the generation of piece silver, starch the characteristic of its wide sintering process window and can't embody so that contain the silver of the silver powder of different sintering activities.Therefore, prepare a kind of excellent performance, have the back silver paste of solar cell of wide sintering process window, need at least to carry out integrated survey from the sintering activity of silver powder and these two angles of sintering process performance of glass dust.
Summary of the invention
The technical issues that need to address of the present invention are to overcome the deficiencies in the prior art, a kind of excellent performance is provided, has the back silver paste of solar cell of wide sintering process window.
The technical issues that need to address of the present invention are achieved through the following technical solutions:
A kind of back silver paste of solar cell with wide sintering process window, its composition and percetage by weight thereof are: silver powder 45-55%, unleaded be auxiliary agent without silex glass powder 3-7%, organic bond 10-15%, solvent 20-40%, sintering aids 0.1-5%, surplus, and the percetage by weight sum of each component is 100%.
Above-mentioned silver powder is that 50-80% ball shape silver powder and 20-50% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m; The tap density of flake silver powder〉4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m.
Above-mentioned unleadedly form and percetage by weight is: 65-85% bismuth oxide, 3-15% boron oxide, 1-10% zinc oxide, 1-10% aluminium oxide, 3-15% barium monoxide, 0.1-5% calcium oxide, 0.5-5% vanadium oxide and 0-3% property-modifying additive without the silex glass powder, wherein property-modifying additive is a kind of in zirconium dioxide, phosphorus pentoxide, titanium dioxide and the cobalt sesquioxide, and the percetage by weight sum of each component of glass dust is 100%.Preferred technical scheme is: unleadedly form and percetage by weight is: 72% bismuth oxide, 8% boron oxide, 5% zinc oxide, 5% aluminium oxide, 4% barium monoxide, 3% calcium oxide and 3% vanadium oxide without the silex glass powder.
Above-mentioned sintering aids is silver oxide or silver carbonate.
Above-mentioned organic bond, solvent and auxiliary agent are organic bond, solvent and auxiliary agent general in the used for solar batteries electric slurry.
Compared with prior art, advantage of the present invention is with beneficial effect: the present invention uses silver powder and unleaded the collocation without the silex glass powder of different sintering activities on prescription, and adds a small amount of sintering aids; Wherein, the silver powder mixture of different sintering activities is as the electric conductor of back silver paste, can make silver powder in wider sintering range, form fine and close silverskin structure, unleaded low without silex glass powder crystallization degree, be conducive to promote silver powder dissolving in glassy phase in wide sintering range, effectively avoid silver powder fusing cohesion to form piece silver, guarantee that silver layer has high conductance; A certain amount of sintering aids can further be avoided the self-coagulation of silver powder; Use by the silver powder of different sintering activities, unleaded collocation without silex glass powder and a small amount of sintering aids, so that this back silver paste of solar cell has wide sintering process window.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Embodiment 1
A kind of back silver paste of solar cell with wide sintering process window, its component and percetage by weight thereof are: 55% silver powder, 7% unleadedly is BYK-110 without silex glass powder, 10% acrylic resin, 20% terpinol, 5% silver oxide, 3%.Wherein, silver powder is that 80% ball shape silver powder and 20% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m, the tap density of flake silver powder 4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m; Unleadedly form and percetage by weight is: 85% bismuth oxide, 3% boron oxide, 1% zinc oxide, 1% aluminium oxide, 3% barium monoxide, 5% calcium oxide, 0.5% vanadium oxide and 1.5% zirconium dioxide without the silex glass powder.
Embodiment 2
A kind of back silver paste of solar cell with wide sintering process window, its component and percetage by weight thereof are: 45% silver powder, 3% unleaded without silex glass powder, 11% ethyl cellulose, 40% solvent, 0.1% silver carbonate, 0.9%BYK-110, wherein, silver powder is that 50% ball shape silver powder and 50% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m, the tap density of flake silver powder 4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m; Unleadedly form and percetage by weight is: 65% bismuth oxide, 15% boron oxide, 4.9% zinc oxide, 2% aluminium oxide, 5% barium monoxide, 0.1% calcium oxide, 5% vanadium oxide and 3% phosphorus pentoxide without the silex glass powder.
Embodiment 3
A kind of back silver paste of solar cell with wide sintering process window, its component and percetage by weight thereof are: 50% silver powder, 5% unleaded without silex glass powder, 10% methacrylic resin, 30% butyl carbitol acetate, 3% silver oxide, 2%BYK-110; Wherein, silver powder is that 70% ball shape silver powder and 30% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m, the tap density of flake silver powder 4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m; Unleadedly form and percetage by weight is: 67% bismuth oxide, 5% boron oxide, 10% zinc oxide, 10% aluminium oxide, 4% barium monoxide, 0.5% calcium oxide, 1.5% vanadium oxide and 2% titanium dioxide without the silex glass powder.
Embodiment 4
A kind of back silver paste of solar cell with wide sintering process window, its component and percetage by weight thereof are: 54% silver powder, 6.5% unleaded without silex glass powder, 12% modified hydrogenated castor oil, 24% turpentine oil, 2.5% silver oxide, 1%BYK-110; Wherein, silver powder is that 60% ball shape silver powder and 40% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m, the tap density of flake silver powder 4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m; Unleadedly form and percetage by weight is: 70% bismuth oxide, 8% boron oxide, 8% zinc oxide, 2% aluminium oxide, 3% barium monoxide, 3% calcium oxide, 4% vanadium oxide and 2% cobalt sesquioxide without the silex glass powder.
Embodiment 5
A kind of back silver paste of solar cell with wide sintering process window, its component and percetage by weight thereof are: 52% silver powder, 6% unleaded without silex glass powder, 13% acrylic resin, 27% terpinol, 1% silver carbonate, 1%BYK-110; Wherein, silver powder is that 55% ball shape silver powder and 45% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m, the tap density of flake silver powder 4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m; Unleadedly form and percetage by weight is: 72% bismuth oxide, 8% boron oxide, 5% zinc oxide, 5% aluminium oxide, 4% barium monoxide, 3% calcium oxide and 3% vanadium oxide without the silex glass powder.
Above-mentioned each embodiment is to further specifying 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.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away 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 (6)
1. back silver paste of solar cell with wide sintering process window, it is characterized in that: the composition of this back silver paste and percetage by weight thereof are: silver powder 45-55%, unleaded be auxiliary agent without silex glass powder 3-7%, organic bond 10-15%, solvent 20-40%, sintering aids 0.1-5%, surplus; And the percetage by weight sum of each component is 100%.
2. the back silver paste of solar cell with wide sintering process window according to claim 1, it is characterized in that: described silver powder is that 50-80% ball shape silver powder and 20-50% flake silver powder form the tap density of ball shape silver powder by percetage by weight〉5g/cm
3, average grain diameter is 0.2-1.5 μ m; The tap density of flake silver powder〉4.5g/cm
3, average thickness is 0.1-0.2 μ m, average transverse is 0.5-3 μ m.
3. the back silver paste of solar cell with wide sintering process window according to claim 1, it is characterized in that: described unleadedly form and percetage by weight is without the silex glass powder: bismuth oxide 65-85%, boron oxide 3-15%, zinc oxide 1-10%, aluminium oxide 1-10%, barium monoxide 3-15%, calcium oxide 0.1-5%, vanadium oxide 0.5-5% and property-modifying additive 0-3%, and the percetage by weight sum of each component of glass dust is 100%.
4. the back silver paste of solar cell with wide sintering process window according to claim 3 is characterized in that: described unleadedly form and percetage by weight is: 72% bismuth oxide, 8% boron oxide, 5% zinc oxide, 5% aluminium oxide, 4% barium monoxide, 3% calcium oxide and 3% vanadium oxide without the silex glass powder.
5. the back silver paste of solar cell with wide sintering process window according to claim 3 is characterized in that: described property-modifying additive is a kind of in zirconium dioxide, phosphorus pentoxide, titanium dioxide and the cobalt sesquioxide.
6. the back silver paste of solar cell with wide sintering process window according to claim 1, it is characterized in that: described sintering aids is silver oxide or silver carbonate.
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| CN103440901A (en) * | 2013-09-10 | 2013-12-11 | 乐凯胶片股份有限公司 | Low-cost leadless back silver paste for crystalline silica solar energy battery, and preparation method thereof |
| CN104123975A (en) * | 2013-04-25 | 2014-10-29 | Lg电子株式会社 | Paste composite for forming electrode of solar cell |
| CN104465875A (en) * | 2014-12-05 | 2015-03-25 | 清华大学 | Preparation method of photovoltaic cell silver grid line |
| CN104778988A (en) * | 2014-01-09 | 2015-07-15 | 上海贺利氏工业技术材料有限公司 | Low silver conductive paste |
| CN104934104A (en) * | 2015-06-24 | 2015-09-23 | 东方电气集团东方汽轮机有限公司 | Silicon solar cell rear silver paste with low silver content and preparation method therefor |
| CN105185429A (en) * | 2015-08-07 | 2015-12-23 | 昆明贵信凯科技有限公司 | Packaging medium slurry for base-metal-contained electronic slurry and application thereof |
| EP2896602B1 (en) * | 2014-01-16 | 2017-08-09 | Heraeus Precious Metals North America Conshohocken LLC | Low-silver electroconductive paste |
| CN107068240A (en) * | 2017-02-20 | 2017-08-18 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste |
| CN107093489A (en) * | 2017-05-05 | 2017-08-25 | 肇庆市辰业电子有限公司 | A kind of inductance silver paste of inner electrode and preparation method thereof |
| KR101786169B1 (en) * | 2014-01-09 | 2017-10-17 | 헤레우스 프레셔스 메탈즈 노스 아메리카 콘쇼호켄 엘엘씨 | Low-silver Electroconductive Paste |
| CN107424660A (en) * | 2017-02-20 | 2017-12-01 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste used for solar batteries and preparation method thereof |
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| CN108695009A (en) * | 2018-05-21 | 2018-10-23 | 江苏昊科汽车空调有限公司 | Modified high-efficient crystal silicon solar batteries and preparation method thereof |
| CN109616242A (en) * | 2018-11-05 | 2019-04-12 | 肇庆市辰业电子有限公司 | A kind of inductance is with exempting to plate termination electrode silver paste |
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| CN104123975A (en) * | 2013-04-25 | 2014-10-29 | Lg电子株式会社 | Paste composite for forming electrode of solar cell |
| CN103440901B (en) * | 2013-09-10 | 2016-08-24 | 乐凯胶片股份有限公司 | Low cost crystal silicon solar energy battery unleaded back silver paste and preparation method |
| CN103440901A (en) * | 2013-09-10 | 2013-12-11 | 乐凯胶片股份有限公司 | Low-cost leadless back silver paste for crystalline silica solar energy battery, and preparation method thereof |
| CN104778988B (en) * | 2014-01-09 | 2017-10-24 | 上海贺利氏工业技术材料有限公司 | Low conductive silver slurry |
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| KR101786169B1 (en) * | 2014-01-09 | 2017-10-17 | 헤레우스 프레셔스 메탈즈 노스 아메리카 콘쇼호켄 엘엘씨 | Low-silver Electroconductive Paste |
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| CN104465875B (en) * | 2014-12-05 | 2016-09-21 | 清华大学 | A kind of preparation method of photovoltaic cell silver grating line |
| CN104465875A (en) * | 2014-12-05 | 2015-03-25 | 清华大学 | Preparation method of photovoltaic cell silver grid line |
| CN107592944A (en) * | 2015-05-01 | 2018-01-16 | 东洋铝株式会社 | PERC types aluminum paste composition used for solar batteries |
| CN107592944B (en) * | 2015-05-01 | 2019-11-29 | 东洋铝株式会社 | PERC type aluminum paste composition used for solar batteries |
| CN104934104A (en) * | 2015-06-24 | 2015-09-23 | 东方电气集团东方汽轮机有限公司 | Silicon solar cell rear silver paste with low silver content and preparation method therefor |
| CN105185429A (en) * | 2015-08-07 | 2015-12-23 | 昆明贵信凯科技有限公司 | Packaging medium slurry for base-metal-contained electronic slurry and application thereof |
| CN107068240A (en) * | 2017-02-20 | 2017-08-18 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste |
| CN107424660A (en) * | 2017-02-20 | 2017-12-01 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste used for solar batteries and preparation method thereof |
| CN107093489A (en) * | 2017-05-05 | 2017-08-25 | 肇庆市辰业电子有限公司 | A kind of inductance silver paste of inner electrode and preparation method thereof |
| CN107093489B (en) * | 2017-05-05 | 2019-04-05 | 肇庆市辰业电子有限公司 | A kind of inductance silver paste of inner electrode and preparation method thereof |
| CN108695009A (en) * | 2018-05-21 | 2018-10-23 | 江苏昊科汽车空调有限公司 | Modified high-efficient crystal silicon solar batteries and preparation method thereof |
| CN109616242A (en) * | 2018-11-05 | 2019-04-12 | 肇庆市辰业电子有限公司 | A kind of inductance is with exempting to plate termination electrode silver paste |
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