CN104392770A - Crystalline silicon solar cell low-warpage back surface aluminum paste - Google Patents
Crystalline silicon solar cell low-warpage back surface aluminum paste Download PDFInfo
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- CN104392770A CN104392770A CN201410604601.3A CN201410604601A CN104392770A CN 104392770 A CN104392770 A CN 104392770A CN 201410604601 A CN201410604601 A CN 201410604601A CN 104392770 A CN104392770 A CN 104392770A
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Abstract
The invention discloses a crystalline silicon solar cell low-warpage back surface aluminum paste comprising the following parts of components by weight: 60-80 parts of aluminum powder; 0.1-6 parts of glass powder; 15-35 parts of organic carriers; and 0.1-5 parts of an addition agent. The addition agent is MClO3 or MClO4, and M stands for a metal ion. When the aluminum paste is printed on cell pieces and then the cell pieces pass a temperature area of 300-500 DEG C of the sintering process, the oxidation effect of the specified addition agent in the aluminum paste is stimulated so that a new aluminum oxide layer is not generated on the surface of aluminum powder, mutual acting force between aluminum powder particles is reduced, acting force between aluminum powder and silicon chips is not reduced and thus an objective of reducing warpage of the silicon chips is achieved. The oxidation effect of the addition agent is not stimulated at temperature of lower than 300 DEG C so that stability of the aluminum paste is guaranteed.
Description
Technical field
The invention belongs to crystal silicon solar batteries back side aluminium paste technical field, be specifically related to a kind of low warpage back side aluminium paste meeting crystal silicon cell thin slice flower trend.
Background technology
In the manufacture process of crystal silicon solar energy battery, the cell piece back side usually utilizes silk screen printing aluminium paste dry and sinters.The eutectic temperature of aluminium silicon is 577 DEG C, and form aluminium melted silicon higher than aluminium during this temperature and silicon congruent melting in sintering process, in liquation, silicon composition is spread in aluminium lamination by silicon chip, and aluminium component is spread to silicon chip aspect by aluminium lamination; Sinter silicon growth in cooling procedure in liquation at silicon chip surface, had part aluminium element can stay in newly-generated silicon layer simultaneously and form p
+namely layer silicon carry on the back electric field, and under the effect of back of the body electric field, electronics pushed away from the back side and then reduces hole, the back side by the probability of electron recombination, improves open circuit voltage; On the other hand forming minute surface at cell backside after aluminium powder sintering, the probability that photon is absorbed by solar cell and then the short circuit current that improve battery can be added by not again being reflected back inside battery by the sunlight that battery absorbs through battery.So the performance of aluminium paste is very important for raising solar cell photoelectric characteristic.
In the solar cell aluminium paste of routine, the thermal coefficient of expansion of Al-Si alloy, much larger than the thermal coefficient of expansion of silicon, is sintering the contraction of cold rear Al-Si alloy much larger than silicon chip, is applying to silicon chip the warpage that tension stress forms convex.Along with the raising of automaticity, constantly have producer to adopt silicon chip of solar cell automatic welding technique, the warpage of silicon chip can cause components welding rate of finished products significantly to reduce.Typical conditions typography reduces the method for warpage as reduced aluminium paste printing weight in wet base, reduces limited space, also can weaken the inactivating performance of aluminium back surface field simultaneously because of the reduction of aluminium paste weight; And by regulating the method for aluminium paste formula as reduced the thermal coefficient of expansion of Al-Si, the additive of low-expansion coefficient or negative thermal expansion coefficient is added in aluminium paste, or change frit compositions and addition, these methods then can cause aluminium paste adhesive force weak, and back surface field passivation can be reduced, have a strong impact on battery mechanics and electric property.
Along with the development of solar battery technology, crystal silicon battery sheet becomes a kind of trend of solar battery technology development, now the warpage issues that causes of aluminium paste is more outstanding, in order to address this problem the additive that adds in the statement of a lot of patent and reduce warpage as silicon dioxide (Korean Patent No.798258), organotin (U.S. Patent No. 2009/025583), antimony oxide (Chinese patent CN102376380A) etc.These methods reduce the warpage of aluminium paste to a certain extent, but more and more less with its effect that can play of raising of sintering temperature.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, provides a kind of crystal silicon solar energy battery low warpage back side aluminium paste.
In order to achieve the above object, technical scheme provided by the invention is:
Described crystal silicon solar energy battery low warpage back side aluminium paste comprises the component of following weight portion:
Aluminium powder 60-80 parts;
0.1-6 parts, glass dust;
Organic carrier 15-35 parts;
Additive 0.1-5 parts;
Described additive is MClO
3or MClO
4, wherein M representation metal ion.
Preferably, described M is alkali metal: at least one in lithium, sodium, potassium, rubidium, caesium, francium.
Preferably, the average grain diameter of described aluminium powder is 1 μm ~ 10 μm.
Preferably, described glass dust is at least one in plumbous system, bismuth glass.
Preferably, described organic carrier is at least one in terpinol, butyl carbitol, butyl carbitol acetate, alcohol ester 12, DBE, ethyl cellulose, resin.Described resin is preferably ethyl cellulose or phenolic resins.
Preferably, described organic carrier is that after being mixed by 10 weight portion ethyl celluloses, 65 weight portion terpinols, 5 weight portion butyl, 6 weight portion alcohol esters, 12 weight portion butyl carbitol, 2 parts by weight of phenolic resin, 100-200 DEG C of dissolving, stir obtained organic carrier.
Preferably, the dispersant of 0.5-10 parts is also comprised in described aluminium paste.
Preferably, described dispersant is at least one in stearic acid, class of department, lecithin, oleic acid, laurate.
The present invention will be further described below:
Main innovate point of the present invention is, with the addition of more than 300 DEG C and can discharge oxygen and the additive showing oxidizability, described additive chlorate (MClO in the preparation process of aluminium paste
3) or perchlorate (MClO
4), this additive constantly discharges oxygen in aluminium paste sintering process, impel aluminum particle surface constantly to form new oxide layer, and then the linking power reduced between aluminum particle achieves the low warpage properties of rear surface of solar cell aluminium paste.Specifically, when passing through 300-500 DEG C of warm area in sintering process after cell piece printing aluminium paste, the oxidation of special additive in aluminium paste can be excited, impelling aluminium powder surface not generate new alumina layer.And then the interaction force between reduction aluminum particle, the active force do not reduced between aluminium powder and silicon chip reaches the object reducing silicon warp again simultaneously.And the oxidation of this additive can not be excited lower than 300 °, and then ensure that aluminium paste stability.
Get out aluminium powder, glass dust and additive respectively when preparing above-mentioned aluminium paste, organic carrier then by terpinol, butyl carbitol, butyl carbitol acetate, alcohol ester 12, DBE, ethyl cellulose, resin one or more materials mix after 100-200 DEG C of dissolving, stir obtained, then each raw material components is mixed, obtained aluminium paste.
Compared with prior art, beneficial effect of the present invention is:
The crystal silicon solar batteries back side aluminium paste of low warpage of the present invention, reduce the active force in aluminium lamination between aluminum particle, reduce the angularity of the crystal silicon solar batteries burnt till, the adhesive force simultaneously between aluminium powder and silicon chip is not weakened because there being the existence of the solid binder such as glass dust.Aluminium paste of the present invention is lower than under 300 DEG C of conditions, wherein additive is that stable state does not show oxidizability, ensure that the stability of aluminium paste, at high temperature sintering stage particularly 300-500 DEG C of warm area, additive decomposes and constantly discharges oxygen under heat effect, impels aluminum particle surface constantly to form new oxide layer, reaches the object significantly reducing silicon warp, ensure the adhesive force of aluminium powder layer and silicon chip simultaneously, ensure the passivation of aluminium back surface field.The present invention can reduce the silicon warp that aluminium paste causes under not improving battery cost, not changing existing technique prerequisite.
Embodiment
Preparation method: get out aluminium powder, glass dust and additive respectively, organic carrier then by the resins such as terpinol, butyl carbitol, butyl carbitol acetate, alcohol ester 12, DBE, ethyl cellulose, phenolic resins, abietic resin one or more materials mix after 100-200 DEG C of dissolving, stir obtained, then each raw material components is mixed, obtained aluminium paste.
According to above-mentioned preparation method, slurry A as shown in table 1 is control group, and slurry A1 to A5 is five kinds of specific implementation methods of aluminium paste of the present invention.
Table 1 aluminium paste proportioning (weight portion)
Wherein, the glass dust that all aluminium pastes use is Bi2O3-SiO2-ZnO system lead-free glass powder, and model is BP3100; The organic carrier used is mixed by 10 weight portion ethyl celluloses, 65 weight portion terpinols, 5 weight portion butyl, 6 weight portion alcohol esters, 12 weight portion butyl carbitol, 2 parts by weight of phenolic resin, 100-200 DEG C of dissolving, stir obtained organic carrier, and wherein degree refers to weight percent content.The performance comparison data of each group of aluminium paste are in table 2, and visible aluminium paste of the present invention has low warpage properties and high adhesion force characteristic, and ensure that crystal silicon solar batteries is electrical.
Table 2 embodiment aluminium paste electrical property compares
Claims (8)
1. a crystal silicon solar energy battery low warpage back side aluminium paste, is characterized in that, described aluminium paste comprises the component of following weight portion:
Aluminium powder 60-80 parts;
0.1-6 parts, glass dust;
Organic carrier 15-35 parts;
Additive 0.1-5 parts;
Described additive is MClO
3or MClO
4, wherein M representation metal ion.
2. aluminium paste according to claim 1, is characterized in that, described M is at least one in lithium, sodium, potassium, rubidium, caesium, francium.
3. aluminium paste according to claim 1, is characterized in that, the average grain diameter of described aluminium powder is 1 μm ~ 10 μm.
4. aluminium paste according to claim 1, is characterized in that, described glass dust is at least one in plumbous system, bismuth glass.
5. aluminium paste according to claim 1, it is characterized in that, described organic carrier, by least one in the resins such as ethyl cellulose, acetate butyrate fiber, phenolic resins, is dissolved in terpinol, butyl carbitol, butyl carbitol acetate, alcohol ester 12, DBE equal solvent and makes.
6. aluminium paste according to claim 5, is characterized in that, described resin is ethyl cellulose or phenolic resins.
7. aluminium paste according to claim 1, is characterized in that, also comprises the dispersant of 0.5-10 parts in described aluminium paste.
8. aluminium paste according to claim 7, is characterized in that, described dispersant is at least one in stearic acid, class of department, lecithin, oleic acid, laurate.
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|---|---|---|---|
| CN201410604601.3A CN104392770A (en) | 2014-10-31 | 2014-10-31 | Crystalline silicon solar cell low-warpage back surface aluminum paste |
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| CN201410604601.3A CN104392770A (en) | 2014-10-31 | 2014-10-31 | Crystalline silicon solar cell low-warpage back surface aluminum paste |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225722A (en) * | 2015-10-22 | 2016-01-06 | 江苏泓源光电科技股份有限公司 | A kind of crystal silicon solar batteries aluminium paste of high conduction performance |
| CN107778764A (en) * | 2016-08-26 | 2018-03-09 | 湖南利德电子浆料股份有限公司 | A kind of solar cell size organic carrier and preparation method thereof |
| CN109493992A (en) * | 2018-10-15 | 2019-03-19 | 海宁市瑞银科技有限公司 | High adhesion force PERC crystal silicon solar energy battery aluminium paste and preparation method thereof |
| CN109994251A (en) * | 2019-02-20 | 2019-07-09 | 常州大学 | A kind of low warpage PERC solar battery aluminium paste and preparation method |
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| CN101304049A (en) * | 2007-05-09 | 2008-11-12 | 东进世美肯株式会社 | Paste for electrode forming of solar cell |
| CN102522141A (en) * | 2011-12-28 | 2012-06-27 | 彩虹集团公司 | Conducting aluminum paste for silicon solar cell and preparation method thereof |
| CN103199128A (en) * | 2013-04-07 | 2013-07-10 | 湖南红太阳光电科技有限公司 | High-temperature resistant and low-warpage aluminum paste |
| CN103226989A (en) * | 2012-01-30 | 2013-07-31 | 比亚迪股份有限公司 | Corrosive carrier, preparation method thereof, crystalline silicon solar battery front/back side silver conductive paste and preparation method thereof |
| CN103354940A (en) * | 2010-12-17 | 2013-10-16 | 太阳化学公司 | Aluminum-based compositions and solar cells including aluminum-based compositions |
| US20140048116A1 (en) * | 2010-12-12 | 2014-02-20 | Heraeus Precious Metals Gmbh & Co. Kg | Electro-conductive pastes with salts with an anion consisting of halogen and oxygen in solar cell applications |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101304049A (en) * | 2007-05-09 | 2008-11-12 | 东进世美肯株式会社 | Paste for electrode forming of solar cell |
| US20140048116A1 (en) * | 2010-12-12 | 2014-02-20 | Heraeus Precious Metals Gmbh & Co. Kg | Electro-conductive pastes with salts with an anion consisting of halogen and oxygen in solar cell applications |
| CN103354940A (en) * | 2010-12-17 | 2013-10-16 | 太阳化学公司 | Aluminum-based compositions and solar cells including aluminum-based compositions |
| CN102522141A (en) * | 2011-12-28 | 2012-06-27 | 彩虹集团公司 | Conducting aluminum paste for silicon solar cell and preparation method thereof |
| CN103226989A (en) * | 2012-01-30 | 2013-07-31 | 比亚迪股份有限公司 | Corrosive carrier, preparation method thereof, crystalline silicon solar battery front/back side silver conductive paste and preparation method thereof |
| CN103199128A (en) * | 2013-04-07 | 2013-07-10 | 湖南红太阳光电科技有限公司 | High-temperature resistant and low-warpage aluminum paste |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225722A (en) * | 2015-10-22 | 2016-01-06 | 江苏泓源光电科技股份有限公司 | A kind of crystal silicon solar batteries aluminium paste of high conduction performance |
| CN107778764A (en) * | 2016-08-26 | 2018-03-09 | 湖南利德电子浆料股份有限公司 | A kind of solar cell size organic carrier and preparation method thereof |
| CN109493992A (en) * | 2018-10-15 | 2019-03-19 | 海宁市瑞银科技有限公司 | High adhesion force PERC crystal silicon solar energy battery aluminium paste and preparation method thereof |
| CN109994251A (en) * | 2019-02-20 | 2019-07-09 | 常州大学 | A kind of low warpage PERC solar battery aluminium paste and preparation method |
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Application publication date: 20150304 |