CN106328246A - Positive silver paste for crystalline silicon solar cell - Google Patents
Positive silver paste for crystalline silicon solar cell Download PDFInfo
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- CN106328246A CN106328246A CN201510355491.6A CN201510355491A CN106328246A CN 106328246 A CN106328246 A CN 106328246A CN 201510355491 A CN201510355491 A CN 201510355491A CN 106328246 A CN106328246 A CN 106328246A
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- silver paste
- positive silver
- silicon solar
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- powder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to positive silver paste for a crystalline silicon solar cell. The positive silver paste for the crystalline silicon solar cell comprises silver powder, lead-free glass powder and an organic carrier, wherein the lead-free positive silver paste also comprises an additive composition; and the weight ratio of the lead-free glass powder to the additive is 1 to 0.1-5. By adoption of the positive silver paste for the crystalline silicon solar cell, corrosion of an alkali material in the lead-free glass powder to a packaging material EVA adhesive film of the cell is lowered; a protection effect failure to the cell caused by delamination of the packaging material EVA adhesive film is avoided; and the service life of the battery is prolonged.
Description
Technical field
The present invention relates to a kind of crystal silicon solar energy battery positive silver paste, belong to technical field of solar batteries.
Background technology
Solar energy is a kind of green energy resource, because it is pollution-free, inexhaustible, not by advantages such as resource advantage are limited
And be increasingly subject to people's attention, so solaode arises at the historic moment.Crystal silicon solar batteries is a kind of
Can be to luminous energy response the device that electric energy can be converted light energy into, it can utilize photovoltaic effect by light
Electric energy can be converted to.When sunlight is irradiated to cell panel, produce certain electric potential difference on surface, battery the two poles of the earth,
Connect external circuits, it is possible to produce electric current.Several batteries have been connected by the way of serial or parallel connection
Come, then seal protection through encapsulating material EVA adhesive film (ethylene-vinyl acetate copolymer), just can make electricity
Pond assembly, and then composition battery array, coordinate composition autonomous system or be connected to the grid with other electronic devices,
The supply of electric power of cleaning is provided.Crystal silicon solar batteries electrode includes front silver electrode, back silver electrode and aluminum
Back surface field electrode, front silver electrode be use front side silver paste through silk screen printing, be dried, high temperature sintering formed,
The performance of front side silver paste directly determines the performance of solar battery sheet front silver electrode, is crystal silicon solar
Critical material in battery manufacture.
At present, crystal silicon solar batteries positive silver paste is generally prepared by argentum powder, lead-free glass powder and organic carrier
Forming, great majority positive silver slurry uses the glass dust containing higher proportion lead oxide.In order to preferably safeguard the mankind
The living environment depended on for existence, the unleaded development trend having become electronics manufacturing of electronic product, utilize nothing
Lead glass powder prepares the developing direction that lead-free silver slurry also becomes following.In existing positive silver slurry technology, contained unleaded
Glass dust comprises basic anhydride, in sintering process, and the positive silver slurry corrosiveness to SiNx:H antireflective coating
Complete mainly by alkali glass, and react and mainly carry out on silicon substrate surface, during simultaneously because slurry melts
Between extremely short, viscosity is high, poor fluidity, and this can cause each material distribution difference in electrode material.Course of reaction
In react near the glass of silicon substrate part and be consumed, but still there is a considerable amount of alkalescence on electrode top layer
Material remains, and the alkaline matter of residual makes the encapsulating material EVA adhesive film of battery under high temperature and hygrothermal environment
Ester be good for rupture, polymer molecular chain occur aging cracking degeneration, ultimately result in encapsulating material EVA adhesive film
Delamination and battery is lost protective effect, reduce battery service life.
Summary of the invention
The primary and foremost purpose of the present invention is, overcomes problems of the prior art, it is provided that a kind of superior performance
Crystal silicon solar energy battery positive silver paste.
For solving above technical problem, a kind of crystal silicon solar energy battery positive silver paste provided by the present invention,
It is characterized in that: raw material components and the weight content of described positive silver paste are as follows: argentum powder 87-92 part, have
Airborne body 5-10 part, lead-free glass powder 1～5 parts and additive 0.1～2 parts, the weight of the most each component
Percent sum is 100%.Described silver part is high tap density silver powder, and tap density is often stood more than 6g
Square centimetre.The composition of described lead-free glass powder and percetage by weight be: Bi2O340-60%, Pb3O4-
8-15%, TeO220-35%, SiO22-6%, ZnO3-8%, MgO3-8%, TiO20.5-2%, P2O5-
0.5-2%.The composition of organic carrier and percetage by weight be: terpineol 40-65%, ethyl cellulose
5-10%, butyl carbitol 10-15%, butyl carbitol acetate 9-15%, n-butyl alcohol 10-15%,
Benzyl alcohol 10-15%, Span804-7%.
It is an advantage of the current invention that and overcome problems of the prior art, it is provided that a kind of crystal silicon solar
The preparation method of battery positive silver paste, the positive silver paste electricity conversion made is high, and adhesive force is high, and high
Temperature aging postadhesion power transformation efficiency decay is little, and compared with prior art, the present invention passes through glass dust and organic interpolation
The usage ratio being applied in combination and controlling them of agent, at guarantee glass dust in sintering process to silicon chip surface
SiNx:H antireflective coating produces corrosiveness, realizes while silver electrode contacts with the good conductive of silicon substrate,
At sintering process and cooling stage, additive reacts with lead-free glass powder and can partly be transferred to positive silver electrode
Surface, consumes the alkaline matter that positive silver electrode surface is remaining so that positive silver electrode surface is neutral or close
Neutrality, reduce the alkaline matter corrosion for the encapsulating material EVA adhesive film of battery, it is to avoid encapsulating material
EVA adhesive film loses the protective effect to battery because of delamination, improves the service life of battery.
Detailed description of the invention
Embodiment one
The positive silver paste that the present invention provides is for making the positive silver electrode of crystal silicon solar batteries, described positive silver paste
It is prepared from by argentum powder, lead-free glass powder, organic carrier and compositions of additives.Lead-free glass powder is quickly
Liquefy during sintering, between argentum powder and silicon chip, play cementation, simultaneously work as penetrating the work of antireflective coating
With, make between argentum powder and silicon chip, to form good Ohmic contact.The lead-free glass powder that the present invention uses is this
Well known to skilled person, it directly can be bought from market and those skilled in the art can also be used to know
Method prepare, its softening temperature is 350 DEG C～600 DEG C.Because when its softening temperature is less than 350 DEG C,
The glass film layers between positive silver electrode and silicon chip may be caused blocked up because of the excess flow of glass melt,
Positive silver electrode is caused to rise with the contact resistance of silicon chip；When its softening temperature is higher than 600 DEG C, it is likely to result in
Glass dust and argentum powder sintering not exclusively, produce " raw burn " phenomenon, cause the body electricity of loss of adhesion and positive silver electrode
Resistance rises.The lead-free glass powder being suitable for the present invention can be selected for by Bi2O3、Pb3O4、TeO2、SiO2、ZnO、
MgO、TiO2、P2O5The crown glass system of composition, the size controlling of glass dust, below 10 microns, is used
Amount is the 1～5% of silver paste weight.If the consumption of glass dust is less than 0.5%, the etching of antireflective coating can be affected
And the adhesive force between silicon substrate and silver electrode；If consumption is more than 5%, the electrical property of cell piece can be reduced.Nothing
The corrosiveness of silicon nitride anti-reflecting film, in sintering process, is mainly carried out by lead glass powder on silicon substrate surface,
Simultaneously as the thawing time of positive silver paste is extremely short, viscosity is high, poor fluidity, causes in positive silver electrode each
The distribution of material is different, causes the lead-free glass powder near silicon substrate to be consumed, and the top layer of positive silver electrode is still
Having a considerable amount of alkaline matter to remain, the alkaline matter of these residuals makes battery under high temperature and hygrothermal environment
The ester of encapsulating material EVA adhesive film be good for rupture, there is aging cracking degeneration in polymer molecular chain, finally
Cause the delamination of encapsulating material EVA adhesive film that battery loses protective effect, reduce the service life of battery.
The alkaline matter remaining in order to consume positive silver electrode surface so that positive silver electrode surface in neutral or close in
Property, reduce the alkaline matter corrosion for the encapsulating material EVA adhesive film of battery, the positive silver that the present invention provides
Slurry employs additive.In sintering process, additive melts and reacts with lead-free glass powder,
Produce the neutral substance harmless to encapsulating material；At the cooling stage of sintering process back segment, due to crown glass
Powder molten mass cooling meat, the additive of melting state is transferred to positive silver electrode surface so that its further with
The alkali substance reaction of electrode surface, consumes remaining alkali compounds, and causing positive silver electrode surface is neutrality
Or close to neutral, thus eliminate the alkaline matter impact on EVA layer.The fusing point of the additive that the present invention uses
Lower than the softening temperature of glass dust 10 DEG C～260 DEG C, it is therefore an objective to utilize the fusing point difference of the two to control dividing of additive
Cloth.The fusing point of additive is higher than glass dust softening point, or the two difference is less than 10 DEG C, after sintering cooling, adds
Agent may retain without migrating to surface inside positive silver electrode.The fusing point of additive and glass dust softening point
Difference is more than 260 DEG C, and its fusing point and volatilization temperature are too low, cause additive in sintering process excess flow or volatilization,
Affect electrode outward appearance.Additive amount is the 0.1～2% of silver paste gross weight, if consumption is too low, then can not
Play the effect consuming excess basic material, it is impossible to solve the aging delamination of EVA: if consumption is too high,
Electrode body resistance may be increased.In order to both can guarantee that, there is between argentum powder and silicon chip good Ohmic contact,
Can prevent again the alkaline matter in slurry from using for the corrosion of the encapsulating material EVA adhesive film of battery, the present invention
Additive is applied in combination with lead-free glass powder, and controls its usage ratio, lead-free glass powder and additive it
Between weight ratio control in the range of 1: 0.1～5.0, less than this proportion, can be to the corruption of positive silver paste
Erosion performance produces impact, causes positive silver paste contact resistance to rise；Higher than this proportion, it is impossible to prevent nothing
The alkaline matter in the lead glass powder corrosiveness to EVA.
The argentum powder used in the present invention can select argentum powder well known in the art, preferably mean diameter 0.2～2 micro-
Rice, the tap density argentum powder more than 4.5g/cc.
The organic carrier that the present invention uses can select resin well known in the art and solvent to prepare, the most following
Organic carrier prepared by method: by terpineol 40-65%, ethyl cellulose 5-10%, butyl carbitol 10-15%,
Want base carbitol acetate 9-15%, n-butyl alcohol 10-15%, benzyl alcohol 10-15% and Span804-7%'s is organic molten
Agent mixing and stirring is also heated to 60-90 DEG C, until polymer is completely dissolved, forms clear viscous liquids,
Impurity screening, obtains described organic carrier.
The crystal silicon solar energy battery that the present invention provides can use following method to give with unleaded positive silver paste
Preparation:
To account for positive silver paste weight 0.5～the organic carrier of the lead-free glass powder of 5%, 8～20%, 0.3～
After the additive mix homogeneously of 4.5%, add the argentum powder of 75～90%, grind after stirring, obtain crystalline silicon too
Sun can the unleaded positive silver paste of battery.
By above-mentioned slurry with 280～400 mesh web plates, by the way of silk screen printing, it is printed on crystal silicon solar electricity
On silicon chip front, pond, the slurry after printing is through 160～270 DEG C of drying, under the high temperature of 650～950 DEG C
Sintering forms front silver electrode.
Below in conjunction with specific embodiment, the invention will be further described.
The preparation of organic carrier:
Weigh terpineol 40, ethyl cellulose 5, butyl carbitol 10, want base carbitol acetate 9, positive fourth
Alcohol 10, benzyl alcohol 10 and Span804, it is mixed and heated 60～90 DEG C, dissolves, obtain organic binder bond,
Standby.
Embodiment 1
Weighing the ultra-fine softening temperature of 5g is 560 DEG C of lead-free glass powders, 75g argentum powder, 19g organic carrier, 1g tri-
Aoxidize two boron, mix homogeneously, three-roller rolling fineness less than 10 microns, with terpineol adjust viscosity to 280～
400Pa.s, obtains the unleaded positive silver paste of crystal silicon solar energy battery.
Embodiment 2
Weighing the ultra-fine softening temperature of 3g is 600 DEG C of lead-free glass powders, 75g argentum powder, 20g organic carrier, 0.3g
Phosphorus pentoxide, 1g tellurium dioxide, mix homogeneously, three-roller rolling fineness, less than 10 microns, uses terpineol
Adjustment viscosity, to 280～400Pa.s, obtains the unleaded positive silver paste of crystal silicon solar energy battery.
Embodiment 3
Weighing the ultra-fine softening temperature of 0.5g is 350 DEG C of lead-free glass powders, 90g argentum powder, 9.2g organic carrier, 0.3g
Phosphorus pentoxide, mix homogeneously, three-roller rolling fineness less than 10 microns, with terpineol adjust viscosity to 280～
400Pa.s, obtains the unleaded positive silver paste of crystal silicon solar energy battery.
Embodiment 4
Weigh the ultra-fine softening temperature of 0.9g be 435 DEG C of lead-free glass powders, 86.6g argentum powder, 8g organic carrier, 4.5
Selenium dioxide, mix homogeneously, three-roller rolling fineness less than 10 microns, with terpineol adjust viscosity to 280～
400Pa.s, obtains the unleaded positive silver paste of crystal silicon solar energy battery.
Embodiment 5
Weigh the ultra-fine softening temperature of 2g be 480 DEG C of lead-free glass powders, 85g argentum powder, 9.5g organic carrier, 4.5 2
Selenium oxide, mix homogeneously, three-roller rolling fineness less than 10 microns, with terpineol adjust viscosity to 280～
400Pa.s, obtains the unleaded positive silver paste of crystal silicon solar energy battery.
Claims (4)
1. a crystal silicon solar energy battery positive silver paste, it is characterised in that: described positive silver paste former
Material component and weight content are as follows: argentum powder 87-92 part, organic carrier 5-10 part, unleaded glass
Glass powder 1～5 parts and additive 0.1～2 parts, the percetage by weight sum of the most each component is
100%.
2. according to a kind of crystal silicon solar energy battery positive silver paste described in right 1, it is characterised in that:
Described silver part is high tap density silver powder, and tap density is more than 6g every cubic centimetre.
3. according to a kind of crystal silicon solar energy battery positive silver paste described in right 1, it is characterised in that:
The composition of described lead-free glass powder and percetage by weight be: Bi2O340-60%, Pb3O4-
8-15%, TeO220-35%, SiO22-6%, ZnO3-8%, MgO3-8%, TiO20.5-2%,
P2O50.5-2%.
4. according to a kind of crystal silicon solar energy battery positive silver paste described in right 1, it is characterised in that:
The composition of organic carrier and percetage by weight be: terpineol 40-65%, ethyl cellulose
5-10%, butyl carbitol 10-15%, butyl carbitol acetate 9-15%, n-butyl alcohol
10-15%, benzyl alcohol 10-15%, Span804-7%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510355491.6A CN106328246A (en) | 2015-06-19 | 2015-06-19 | Positive silver paste for crystalline silicon solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510355491.6A CN106328246A (en) | 2015-06-19 | 2015-06-19 | Positive silver paste for crystalline silicon solar cell |
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| Publication Number | Publication Date |
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| CN106328246A true CN106328246A (en) | 2017-01-11 |
Family
ID=57729783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510355491.6A Pending CN106328246A (en) | 2015-06-19 | 2015-06-19 | Positive silver paste for crystalline silicon solar cell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107689261A (en) * | 2016-08-04 | 2018-02-13 | 江苏正能电子科技有限公司 | A kind of crystal silicon solar energy battery positive silver paste |
| CN107879635A (en) * | 2017-08-31 | 2018-04-06 | 无锡帝科电子材料科技有限公司 | For preparing glass powder including its paste composition, the electrode of solar battery and solar cell of electrode of solar battery |
| CN108695012A (en) * | 2017-04-11 | 2018-10-23 | 三星Sdi株式会社 | It is used to form the composition of electrode of solar battery and the electrode using its preparation |
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| JP2008251324A (en) * | 2007-03-30 | 2008-10-16 | Hitachi Powdered Metals Co Ltd | Conductive paste |
| CN101789456A (en) * | 2010-03-05 | 2010-07-28 | 西安宏星电子浆料科技有限责任公司 | Lead-free aluminum paste for solar battery |
| CN101887764A (en) * | 2010-06-28 | 2010-11-17 | 彩虹集团公司 | Method for preparing silicon-based solar front silver paste |
| CN103903677A (en) * | 2014-03-18 | 2014-07-02 | 上海志感电子科技有限公司 | Medium temperature sintering type electro-conduction slurry with lead-free glass powder and preparation method of medium temperature sintering type electro-conduction slurry |
| CN104575667A (en) * | 2014-12-24 | 2015-04-29 | 乐凯胶片股份有限公司 | Conductive silver paste for frontage of crystalline silicon solar cell |
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2015
- 2015-06-19 CN CN201510355491.6A patent/CN106328246A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008251324A (en) * | 2007-03-30 | 2008-10-16 | Hitachi Powdered Metals Co Ltd | Conductive paste |
| CN101789456A (en) * | 2010-03-05 | 2010-07-28 | 西安宏星电子浆料科技有限责任公司 | Lead-free aluminum paste for solar battery |
| CN101887764A (en) * | 2010-06-28 | 2010-11-17 | 彩虹集团公司 | Method for preparing silicon-based solar front silver paste |
| CN103903677A (en) * | 2014-03-18 | 2014-07-02 | 上海志感电子科技有限公司 | Medium temperature sintering type electro-conduction slurry with lead-free glass powder and preparation method of medium temperature sintering type electro-conduction slurry |
| CN104575667A (en) * | 2014-12-24 | 2015-04-29 | 乐凯胶片股份有限公司 | Conductive silver paste for frontage of crystalline silicon solar cell |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107689261A (en) * | 2016-08-04 | 2018-02-13 | 江苏正能电子科技有限公司 | A kind of crystal silicon solar energy battery positive silver paste |
| CN108695012A (en) * | 2017-04-11 | 2018-10-23 | 三星Sdi株式会社 | It is used to form the composition of electrode of solar battery and the electrode using its preparation |
| CN108695012B (en) * | 2017-04-11 | 2020-11-24 | 三星Sdi株式会社 | Composition for forming solar cell electrode and electrode prepared using the same |
| CN107879635A (en) * | 2017-08-31 | 2018-04-06 | 无锡帝科电子材料科技有限公司 | For preparing glass powder including its paste composition, the electrode of solar battery and solar cell of electrode of solar battery |
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Application publication date: 20170111 |
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