CN102254587A - Sizing agent for Al-BSF (Al-back surface field) of silicon solar cell and preparation method thereof - Google Patents
Sizing agent for Al-BSF (Al-back surface field) of silicon solar cell and preparation method thereof Download PDFInfo
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- CN102254587A CN102254587A CN2011101268273A CN201110126827A CN102254587A CN 102254587 A CN102254587 A CN 102254587A CN 2011101268273 A CN2011101268273 A CN 2011101268273A CN 201110126827 A CN201110126827 A CN 201110126827A CN 102254587 A CN102254587 A CN 102254587A
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Abstract
The invention discloses a sizing agent for an Al-BSF (Al-back surface field) of a silicon solar cell and a preparation method thereof. The sizing agent is prepared from aluminum powder, aluminum-silicon alloy powder, an organic carrier and a functional additive according to certain parts by weight through mixing and grinding. The silicon solar cell manufactured by using the sizing agent has high photoelectric conversion efficiency, no generation of aluminum beams and aluminum bubbles, firm attachment to silicon wafers and small silicon wafer deformation. According to the invention, glass powder is not adopted as an inorganic binder; the manufactured solar cell has good electrical property and smaller attenuation in the using process; and the problems of poor electrical property, bent silicon wafer, silicon wafer pollution from heavy metals, and the like caused by adding the glass powder to the Al-BSF sizing agent in the traditional silicon solar cell are solved.
Description
Technical field
The present invention relates to a kind of silicon solar cell slurry and preparation method thereof, especially a kind of silicon solar cell aluminium back of the body field slurry and Preparation Method thereof.
Background technology
In the silicon solar cell production process, the aluminium back of the body field of being rich in metallic aluminium (Al) is screen printed in the back side of silicon (Si) sheet usually and carries out drying with slurry, subsequently at the sintering temperature that is higher than the aluminium fusing point, form the Al-Si melt, the silicon epitaxial layer of the aluminium that the cooling back forms, this layer is commonly called back layer, also is referred to as aluminium back of the body field.
The aluminium that forms behind the sintering back of the body must adhesion-tight, the ash that do not fall, and the silicon chip distortion is little, does not produce the pill of aluminium, aluminium steeps.Prior art can form the material of glass ingredient as inorganic adhesive after mostly adding glass dust or sintering, aluminium and silicon are bonded as one, to improve the adhesive force of aluminium back of the body field, patent CN100446277C, CN100463229C, CN101304049A, CN101425545B, CN101345263B, CN101615637B, CN101984493A are exactly typical case's representative of this type of technology.Glass dust mostly is inorganic oxide, and poor electric conductivity can reduce the electrical property of aluminium back of the body field after the introducing; Glass dust contains multiple metal ion, and the diffusion of some metal ingredient in silicon is higher than aluminium far away, destroys the silicon chip PN junction, quickens the decay of silicon solar cell; The glass dust coefficient of expansion is far longer than silicon chip, easily makes silicon chip flexural deformation, even makes the silicon chip fragmentation.Patent of invention CN101621082B, though select for use low-melting glass putty to replace glass dust, be applied to aluminium back of the body field as inorganic binder and use slurry, alleviated the harmful effect of glass dust to aluminium back of the body field, but how much all influential tin is to an aluminium back of the body performance as a kind of impurity element.
Summary of the invention
The purpose of this invention is to provide a kind of silicon solar cell aluminium back of the body field with slurry and preparation method thereof, to solve the above-mentioned problems in the prior art.Adopt the formed aluminium back of the body of slurry of the present invention field, excellent conductivity, smooth surface does not play the pill of aluminium, aluminium bubble, adhesion-tight; The silicon chip metal ion pollution is few, and the solar cell of made is in use decayed little.
As can be seen, the fusing point of aluminium-silicon alloys is lower than single silicon and single aluminium in the certain proportion scope from the aluminium-silicon alloys phasor.Through after the test of many times, select for use the interior alusil alloy of certain proportion scope as inorganic adhesive, can form material or low-melting metal powder of glass ingredient behind instead of glass powder, the sintering, be used for the bonding of aluminium and silicon.
Be to reduce the probability that the aluminium back of the body produces a pill of aluminium, aluminium bubble, improve the silicon solar cell electrical property, introduce the oxide of pure boron, boron or compound in the slurry of the present invention, the simple substance gallium is a fining agent, the crystal grain of fining metal aluminium in the sintering process.
The fine granularity ball aluminum powder, the selection of fine granularity alusil alloy powder can improve the sintered density of aluminium back of the body field, thereby improves the electrical property of silicon solar cell.
The invention discloses a kind of silicon solar cell aluminium back of the body field and use slurry, it is characterized in that this slurry is mixed with and is formed by aluminium powder, alusil alloy powder, organic carrier, functional additive, the weight part ratio of above-mentioned each component is as follows:
55～80 parts of aluminium powders
0.1～10 part in alusil alloy powder
15～30 parts of organic carriers
0.1～5 part of functional additive
Described aluminium powder is a ball aluminum powder; Described aluminium powder, alusil alloy powder degree are 0.5～8 μ m; Described alusil alloy powder is a silica flour and the ratio of aluminium powder weight is 5～25:100, and adding 0.1～5% dolomol is grinding aid, puts into the ball grinder ball milling after the mixing 8～36 hours and gets.
Described organic carrier is formed by polymer and organic solvent mixed dissolution, and described polymer is one or more the mixture in ethyl cellulose, phenolic resins, polyvinyl butyral resin, polyamide, polyurethane resin, mylar, the acrylic resin; Described organic solvent is one or more the mixture in phenmethylol, terpinol, diethylene glycol butyl ether, diethylene glycol monobutyl ether acetate, triethyl citrate, tributyl citrate, acetylation tributyl citrate, lecithin, the diethylene glycol ether.
Described functional additive is one or more a mixture of the oxide of pure boron, boron or compound, simple substance gallium.
Preparing the silicon solar cell aluminium back of the body of the present invention field is made up of following steps successively with the method for slurry:
(1) polymer is dissolved in the organic solvent, forms organic carrier;
(2) preparation alusil alloy powder;
(3) aluminium powder, silicon-aluminum powder, organic carrier, functional additive are mixed, grind, make silicon solar cell aluminium back of the body field slurry through three-roll grinder.
Embodiment
Not implement example below in conjunction with tool, further set forth the present invention.
Embodiment 1
With 15 gram ethyl celluloses, 5 gram phenolic resins, be added in the mixed solution of 10 gram terpinols, 60 gram diethylene glycol butyl ether, 10 gram tributyl citrate, and even in 50 ℃～80 ℃ following dispersing and mixing, it is standby to form transparent organic carrier; 15 gram silica flours are mixed with 100 gram aluminium powders, add 3 gram dolomols, put into ball grinder after the mixing, ball-milling medium is 10:1 with the powder quality ratio, and ball milling forms the alusil alloy powder after 24 hours standby; Get the above-mentioned organic carrier of 20 grams, add 75 gram aluminium powders, 5 gram alusil alloy powder, 2 gram simple substance galliums fully mix, and make silicon solar cell aluminium back of the body field slurry for 3 times with the three-roll grinder system of grinding then.
Embodiment 2.
15 gram ethyl celluloses are added in the mixed solution of 30 gram terpinols, 40 gram diethylene glycol butyl ether, 5 gram tributyl citrate, and even in 50 ℃～80 ℃ following dispersing and mixing, and it is standby to form transparent organic carrier; 10 gram silica flours are mixed with 100 gram aluminium powders, add 3 gram dolomols, put into ball grinder after the mixing, ball-milling medium is 10:1 with the powder quality ratio, and ball milling forms the alusil alloy powder after 10 hours standby; Get the above-mentioned organic carrier of 20 grams, add 75 gram aluminium powders, 5 gram alusil alloy powder, 2 gram simple substance galliums fully mix, and make silicon solar cell aluminium back of the body field slurry for 3 times with the three-roll grinder system of grinding then.
Embodiment 3
With 15 gram ethyl celluloses, 5 gram polyvinyl butyral resins, be added in the mixed solution of 10 gram terpinols, 60 gram diethylene glycol butyl ether, 10 gram tributyl citrate, and even in 50 ℃～80 ℃ following dispersing and mixing, it is standby to form transparent organic carrier; 15 gram silica flours are mixed with 100 gram aluminium powders, add 3 gram dolomols, put into ball grinder after the mixing, ball-milling medium is 10:1 with the powder quality ratio, and ball milling forms the alusil alloy powder after 24 hours standby; Get the above-mentioned organic carrier of 20 grams, add 70 gram aluminium powders, 5 gram alusil alloy powder, 2 gram pure borons fully mix, and make silicon solar cell aluminium back of the body field slurry for 3 times with the three-roll grinder system of grinding then.
Silicon solar cell aluminium back of the body field slurry with preparation, on the silicon solar cell production line after silk screen printing, oven dry, co-sintering form silicon solar cell, observe the silicon solar cell surface state and measure flexibility, short circuit current (Isc), open circuit voltage (Voc), fill factor, curve factor (FF), photoelectric conversion efficiency.
Every performance mean value of measuring is as shown in table 1:
Table 1
| Index | Surface state | Curved down | Isc (A) | Voc (V) | FF % | Efficient % |
| Embodiment 1 | The ash that do not fall, the no pill of aluminium, aluminium bubble | Less than 1mm | 5.43 | 0.623 | 79 | 17.13 |
| Embodiment 2 | The ash that do not fall, the no pill of aluminium, aluminium bubble | Less than 1mm | 5.45 | 0.608 | 76 | 16.95 |
| Outside the embodiment | The ash that do not fall, the no pill of aluminium, aluminium bubble | Less than 1mm | 5.30 | 0.618 | 78 | 16.63 |
As shown in table 1, adopt the silicon solar cell aluminium back of the body field of the present invention's preparation to use slurry, the silicon solar cell of being produced, surface state is good, and crooked little, superior electrical property satisfies the assembling requirement of silicon solar battery assembly.
Claims (7)
1. slurry is used in a silicon solar cell aluminium back of the body field, it is characterized in that this slurry is mixed with and is formed by aluminium powder, alusil alloy powder, organic carrier, functional additive, and the weight part ratio of above-mentioned each component is as follows:
55～80 parts of aluminium powders
0.1～10 part in alusil alloy powder
15～30 parts of organic carriers
0.1～5 part of functional additive.
2. use slurry according to the described a kind of silicon solar cell aluminium back of the body of claim l field, it is characterized in that: described aluminium powder, alusil alloy powder degree are 0.5～8 μ m.
3. use slurry according to the described a kind of silicon solar cell aluminium back of the body of claim l field, it is characterized in that: described aluminium powder is a ball aluminum powder.
4. according to the described a kind of silicon solar cell aluminium back of the body of claim l field slurry, it is characterized in that: described alusil alloy powder is a silica flour and the ratio of aluminium powder weight is 5～25:100, adding 0.1～5% dolomol is grinding aid, puts into the ball grinder ball milling after the mixing 8～36 hours and gets.
5. according to the described a kind of silicon solar cell aluminium back of the body of claim l field slurry, it is characterized in that: described organic carrier is formed by polymer and organic solvent mixed dissolution, and described polymer is one or more the mixture in ethyl cellulose, phenolic resins, polyvinyl butyral resin, polyamide, polyurethane resin, mylar, the acrylic resin; Described organic solvent is one or more the mixture in phenmethylol, terpinol, diethylene glycol butyl ether, diethylene glycol monobutyl ether acetate, triethyl citrate, tributyl citrate, acetylation tributyl citrate, lecithin, the diethylene glycol ether.
6. use slurry according to the described a kind of silicon solar cell aluminium back of the body of claim l, it is characterized in that: described functional additive is one or more a mixture of the oxide of pure boron, boron or compound, simple substance gallium.
7. prepare the described silicon solar cell aluminium of claim 1 back of the body a method, it is characterized in that this method comprises by following steps to form with slurry:
(1) polymer is dissolved in the organic solvent, forms organic carrier;
(2) preparation alusil alloy powder;
(4) aluminium powder, silicon-aluminum powder, organic carrier, functional additive are mixed, grind, make silicon solar cell aluminium back of the body field slurry through three-roll grinder.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522156A (en) * | 2011-12-06 | 2012-06-27 | 南昌大学 | Preparation method of aluminum boron slurry for crystalline silicon solar battery |
| CN102643615A (en) * | 2012-04-21 | 2012-08-22 | 湖南红太阳光电科技有限公司 | Inorganic adhesive for aluminum pulp of crystalline silicon solar cell and preparation method thereof |
| CN103000247A (en) * | 2012-11-10 | 2013-03-27 | 江苏瑞德新能源科技有限公司 | Solar cell backside aluminum paste powder adaptable to high sheet resistance and shallow junction |
| CN103177790A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Solar cell back surface field transition paste and preparation method thereof, preparation method of solar cell piece and solar cell piece |
| CN103617820A (en) * | 2013-11-20 | 2014-03-05 | 东莞市精微新材料有限公司 | Alloy powder for silicon solar cell aluminum paste |
| CN103762249A (en) * | 2013-10-16 | 2014-04-30 | 杭州正银电子材料有限公司 | Back-field passivated-aluminum conductive slurry for crystalline-silicon solar cell and preparation method |
| CN103824653A (en) * | 2014-03-18 | 2014-05-28 | 山西盛驰科技有限公司 | Method for preparing back-field slurry of high-performance crystal silicon solar cell |
| CN103824613A (en) * | 2014-03-18 | 2014-05-28 | 山西盛驰科技有限公司 | High-performance back surface field paste for crystalline silicon solar cell |
| CN105448382A (en) * | 2014-09-12 | 2016-03-30 | 湖南利德电子浆料股份有限公司 | Rare-earth doped efficient crystalline silicon solar cell aluminum paste |
| CN110462845A (en) * | 2017-03-27 | 2019-11-15 | 东洋铝株式会社 | Paste composition used for solar batteries |
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| CN101944554A (en) * | 2010-09-16 | 2011-01-12 | 浙江大学 | Boron-aluminum common gettering method for silicon slice |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522156A (en) * | 2011-12-06 | 2012-06-27 | 南昌大学 | Preparation method of aluminum boron slurry for crystalline silicon solar battery |
| CN103177790B (en) * | 2011-12-23 | 2015-08-26 | 比亚迪股份有限公司 | The preparation method of solar cell back surface field transition slurry and preparation method thereof and solar battery sheet and solar battery sheet |
| CN103177790A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Solar cell back surface field transition paste and preparation method thereof, preparation method of solar cell piece and solar cell piece |
| CN102643615A (en) * | 2012-04-21 | 2012-08-22 | 湖南红太阳光电科技有限公司 | Inorganic adhesive for aluminum pulp of crystalline silicon solar cell and preparation method thereof |
| CN103000247A (en) * | 2012-11-10 | 2013-03-27 | 江苏瑞德新能源科技有限公司 | Solar cell backside aluminum paste powder adaptable to high sheet resistance and shallow junction |
| CN103000247B (en) * | 2012-11-10 | 2015-10-28 | 江苏瑞德新能源科技有限公司 | A kind of solar cell back aluminum slurry powder material adapting to high square resistance shallow junction |
| CN103762249A (en) * | 2013-10-16 | 2014-04-30 | 杭州正银电子材料有限公司 | Back-field passivated-aluminum conductive slurry for crystalline-silicon solar cell and preparation method |
| CN103762249B (en) * | 2013-10-16 | 2016-03-02 | 杭州正银电子材料有限公司 | Crystal silicon solar batteries back surface field passivation aluminum conductive electric slurry and preparation method |
| CN103617820A (en) * | 2013-11-20 | 2014-03-05 | 东莞市精微新材料有限公司 | Alloy powder for silicon solar cell aluminum paste |
| CN103617820B (en) * | 2013-11-20 | 2016-04-13 | 东莞市精研粉体科技有限公司 | A kind of alloyed powder for aluminum paste of silicon solar cells |
| CN103824613A (en) * | 2014-03-18 | 2014-05-28 | 山西盛驰科技有限公司 | High-performance back surface field paste for crystalline silicon solar cell |
| CN103824653B (en) * | 2014-03-18 | 2016-01-20 | 山西盛驰科技有限公司 | The preparation method of a kind of high-performance crystal silicon solar battery back field slurry |
| CN103824653A (en) * | 2014-03-18 | 2014-05-28 | 山西盛驰科技有限公司 | Method for preparing back-field slurry of high-performance crystal silicon solar cell |
| CN105448382A (en) * | 2014-09-12 | 2016-03-30 | 湖南利德电子浆料股份有限公司 | Rare-earth doped efficient crystalline silicon solar cell aluminum paste |
| CN110462845A (en) * | 2017-03-27 | 2019-11-15 | 东洋铝株式会社 | Paste composition used for solar batteries |
| CN110462845B (en) * | 2017-03-27 | 2023-01-13 | 东洋铝株式会社 | Paste composition for solar cell |
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