CN102543260A - Silver paste for electrode of solar cell and method for preparing silver paste - Google Patents
Silver paste for electrode of solar cell and method for preparing silver paste Download PDFInfo
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- CN102543260A CN102543260A CN2012100451577A CN201210045157A CN102543260A CN 102543260 A CN102543260 A CN 102543260A CN 2012100451577 A CN2012100451577 A CN 2012100451577A CN 201210045157 A CN201210045157 A CN 201210045157A CN 102543260 A CN102543260 A CN 102543260A
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Abstract
The invention discloses a silver paste for an electrode of a solar cell and a method for preparing the silver paste. The silver paste comprises the following components by mass percent: 60-85% of silver powder, 8-12% of glass powder, 7-20% of organic phase, 2-8% of organic solvent and 0.1-3% of oxide additive. The silver paste disclosed by the invention has the advantages of excellent high-temperature firing performance; and the electrode fired by the silver paste has high precision and excellent conductivity and is suitable for being applied to battery assemblies with higher photoelectric conversion efficiency.
Description
Technical field:
The present invention relates to a kind of silver slurry that is used for electrode of solar battery and preparation method thereof, this silver slurry is specially adapted to the silicon solar cell system of high electricity conversion, high printing precision requirement.
Technical background:
In recent years, along with global energy is exhausted and increasingly high to the restriction of CO2 discharging, the solar energy especially development of crystal silicon solar has obtained fast development.At present China has become the production base of the maximum solar battery sheet in the whole world, and the used raw material of most solar energy industry all domesticize, but the silver slurry mainly still relies on external import, such as Du Pont and FERRO company.The effect of silver slurry is an alloy-layer of making ohmic contact, and as the lead-in wire of battery, its performance directly has influence on the key index of solar cell---electricity conversion.The silver slurry of crystal silicon solar is that silver powder, inorganic phase, organic facies, organic solvent and inorganic additive mixed rolling are formed.Slurry requires defectives such as surface smoothness height, no particle, pit, burr.
Specifically for the silver powder in the silver slurry, require the even particle size of silver powder, and granularity is moderate.Silver particles can not be excessive can not be too small, and the uniformity of particle size should be better.Uniform particles property silver particles preferably can reduce the reverse leakage current of battery, mortgage and short circuit current thereby improve open circuit, and effectively lifting makes unit for electrical property parameters such as parallel resistance and conversion efficiency.The experiment proof adopts the silver particles of diameter of uniform size in the 0.1-2 micrometer range can obtain splendid performance.
In addition, be fired in the process of electrode at slurry, pass through high temperature, short time and fire, existing slurry is general when firing occurs owing to degradation problem under the resolution appears in contraction, and therefore, the high-temperature firing performance that improves the silver slurry is very necessary.
Summary of the invention:
The purpose of this invention is to provide a kind of silver slurry that is used for electrode of solar battery and preparation method thereof.The high-temperature firing excellent performance of this silver slurry, the electrode precision of firing is high, electric conductivity is good, is fit to apply in the battery component of higher electricity conversion.
To achieve these goals, technical scheme of the present invention is:
A kind of silver slurry that is used for electrode of solar battery, content is 60-85% by component silver powder by mass percentage, and glass dust is 8-12%, and organic facies is 7-20%, and organic solvent is 2-8%, oxide addition is that 0.1-3% forms.
Wherein, the diameter of said silver powder is the 0.1-2 micron, and tap density is more than the 4.5g/cc.
Said glass dust is for containing B
2O
3, PbO, V
2O
5, SiO
2, Al
2O
3Mixture of ingredients.
The softening point of said glass dust is 458 ℃.
Said organic facies is any in ethyl cellulose, phenolic resins, epoxy resin, rosin, stearate, the terpinol.
Said organic solvent be in propane diols ethers, propylene glycol ester class, butanone, BC, ethylene glycol phenyl ether, the BC ester class any.
Said oxide is Bi
2O
3, CaO, MgO, Al
2O
3, Ta
2O
5, ZnO, TiO
2, SbO, SnO
2In any.
To achieve these goals, another technical scheme of the present invention is:
A kind of preparation method who is used for the silver slurry of electrode of solar battery comprises the steps:
1, glass dust is mixed, fusion in the crucible of packing into, wherein heating-up temperature is 1000-1300 ℃; Be incubated 1-2 hour, treat glass metal clarification evenly after, directly pour shrend in the deionized water into; Ball milling on ball mill is crossed 3000 eye mesh screens then, obtains diameter at the glass dust below 5 microns.
2, the glass dust that step 1 is made is put into agate mortar with silver powder, organic facies, organic solvent and oxide addition and is fully mixed; On three-roll grinder, grind three times then, obtain particle diameter below 5 microns, viscosity is at the uniform sizing material of 9-11 ten thousand mPa*S.
3, adopt screen process press that the silver slurry that step 2 makes is printed on the Si substrate,, carry out quick fired electrodes lead-in wire at 700-1000 ℃ more then 80-200 ℃ of drying.
The advantage that the present invention is compared with prior art had: the silver powder particles that this slurry adopts is tiny evenly, and average grain diameter is below 2 microns, preferably below 1 micron.The oxide that the present invention added has the effect of fluxing, thereby the lead of the silver-colored conductive line surfaces of preparation preparation high precision Paint Gloss, suitable; And the oxide addition that adds can reduce potential barrier, help to increase contacting of conducting particles and semiconductor surface, thereby the electric conductivity of raising electrode and the transformation efficiency of solar cell.
Embodiment:
Embodiment 1:
(1) by quality percentage composition prescription:
Silver powder 80%,
Glass dust 9%,
Organic facies 7.8%,
Organic solvent 3%,
Oxide addition 0.2%.
(2) preparation silver slurry, fired electrodes:
(i) glass dust is mixed, fusion in the crucible of packing into then, wherein heating-up temperature is 1200 ℃, is incubated 1 hour.
After (ii) treating glass metal clarification evenly, directly pour shrend in the deionized water into.
(iii) ball milling on ball mill.
(iv) the powder behind the ball milling is sieved with 3000 purpose screen clothes, residual bulky grain is continued ball milling.
(glass dust after v) will sieving mixes with silver powder, organic facies, organic solvent and oxide addition in the said prescription, then this mixture is fully mixed in agate mortar, on three-roll grinder, grinds three times again, obtains the silver slurry.
(vi) adopt screen process press that the silver slurry is printed on the Si substrate,, carry out quick fired electrodes lead-in wire at 700-1000 ℃ more then 80-200 ℃ of drying.
(3) result detects:
The contact conductor surface silvery white of processing behind the high temperature sintering, smooth zero defect, peel strength 6N/cm, soldering is functional, and the cell photoelectric transformation efficiency of preparation is 18.2%.
Embodiment 2:
(1) by quality percentage composition prescription:
Silver powder 80%,
Glass dust 9%,
Organic facies 7.5%,
Organic solvent 3%,
Oxide addition 0.5%.
(2) preparation silver slurry, fired electrodes step are identical with embodiment 1.
(3) result detects
The wire surface silvery white of processing behind the sintering, smooth zero defect, peel strength 6.5N/cm, soldering is functional, and the cell photoelectric transformation efficiency of preparation is 19%.
Embodiment 3:
(1) by quality percentage composition prescription:
Silver powder 78%,
Glass dust 10%,
Organic facies 8%,
Organic solvent 2.5%,
Oxide addition 1.5%.
(2) preparation silver slurry, fired electrodes step are identical with embodiment 1.
(3) result detects
The wire surface silvery white of processing behind the sintering, smooth zero defect, peel strength 7.5N/cm, soldering is functional, and the cell photoelectric transformation efficiency of preparation is 17%.
Embodiment 4:
(1) by quality percentage composition prescription:
Silver powder 61%,
Glass dust 8%,
Organic facies 20%,
Organic solvent 8%,
Oxide addition 3%.
(2) preparation silver slurry, fired electrodes step are identical with embodiment 1.
(3) result detects
The wire surface silvery white of processing behind the sintering, smooth zero defect, peel strength 6.9N/cm, soldering is functional, and the cell photoelectric transformation efficiency of preparation is 18.8%.
Embodiment 5
(1) by quality percentage composition prescription:
Silver powder 70%,
Glass dust 12%,
Organic facies 13%
Organic solvent 3.5%
Oxide addition 1.5%.
(2) preparation silver slurry, fired electrodes step are identical with embodiment 1.
(3) result detects
The wire surface silvery white of processing behind the sintering, smooth zero defect, peel strength 6.8N/cm, soldering is functional, and the cell photoelectric transformation efficiency of preparation is 17%.
Claims (8)
1. a silver that is used for electrode of solar battery is starched, and it is characterized in that: content is 60-85% by component silver powder by mass percentage, and glass dust is 8-12%, and organic facies is 7-20%, and organic solvent is 2-8%, and oxide addition is that 0.1-3% forms.
2. the silver slurry that is used for electrode of solar battery according to claim 1, it is characterized in that: the particle diameter of said silver powder is the 0.1-2 micron, tap density is more than the 4.5g/cc.
3. the silver slurry that is used for electrode of solar battery according to claim 1, it is characterized in that: said glass dust is for containing B
2O
3, PbO, V
2O
5, SiO
2, Al
2O
3Mixture of ingredients.
4. the silver slurry that is used for electrode of solar battery according to claim 1, it is characterized in that: the softening point of said glass dust is 458 ℃.
5. the silver slurry that is used for electrode of solar battery according to claim 1, it is characterized in that: said organic facies is any in ethyl cellulose, phenolic resins, epoxy resin, rosin, stearate, the terpinol.
6. the silver slurry that is used for electrode of solar battery according to claim 1 is characterized in that: said organic solvent be in propane diols ethers, propylene glycol ester class, butanone, BC, ethylene glycol phenyl ether, the BC ester class any.
7. the silver slurry that is used for electrode of solar battery according to claim 1, it is characterized in that: said oxide is Bi
2O
3, CaO, MgO, Al
2O
3, Ta
2O
5, ZnO, TiO
2, SbO, SnO
2In any.
8. a preparation method who is used for the silver slurry of electrode of solar battery according to claim 1 is characterized in that: comprise the steps:
(1) glass dust is mixed, fusion in the crucible of packing into, wherein heating-up temperature is 1000-1300 ℃; Be incubated 1-2 hour, treat glass metal clarification evenly after, directly pour shrend in the deionized water into; Ball milling on ball mill is crossed 3000 eye mesh screens then, obtains diameter at the glass dust below 5 microns;
(2) glass dust that step (1) is made is put into agate mortar with silver powder, organic facies, organic solvent and oxide addition and is fully mixed; On three-roll grinder, grind three times then, obtain particle diameter below 5 microns, viscosity is at the uniform sizing material of 9-11 ten thousand mPa*S;
(3) adopt screen process press that the silver slurry that step (2) makes is printed on the Si substrate,, carry out quick fired electrodes lead-in wire at 700-1000 ℃ more then 80-200 ℃ of drying.
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| CN2012100451577A CN102543260A (en) | 2012-02-27 | 2012-02-27 | Silver paste for electrode of solar cell and method for preparing silver paste |
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| CN2012100451577A CN102543260A (en) | 2012-02-27 | 2012-02-27 | Silver paste for electrode of solar cell and method for preparing silver paste |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077764A (en) * | 2013-02-01 | 2013-05-01 | 李春生 | Electrocondution slurry for front side electrode of solar cell |
| CN103366858A (en) * | 2013-07-08 | 2013-10-23 | 广东羚光新材料股份有限公司 | Silver paste for LED (Light-Emitting Diode) lamp aluminum oxide base and application thereof |
| WO2015003292A1 (en) * | 2013-07-08 | 2015-01-15 | Yu Xiaocui | Composite electrode material and process for preparing front electrode of photovoltaic cell |
| CN104751942A (en) * | 2015-04-23 | 2015-07-01 | 江苏欧耐尔新型材料有限公司 | Lead-free conductive paste for filament screen printing of solar cells and preparation method of lead-free conductive paste |
| CN104867537A (en) * | 2015-04-23 | 2015-08-26 | 江苏欧耐尔新型材料有限公司 | Low-lead high-sheet-resistance silicon solar battery front-surface silver electrode slurry and preparation method thereof |
| CN106463198A (en) * | 2014-05-19 | 2017-02-22 | 太阳化学公司 | A silver paste containing bismuth oxide and its use in solar cells |
| US10056508B2 (en) | 2015-03-27 | 2018-08-21 | Heraeus Deutschland GmbH & Co. KG | Electro-conductive pastes comprising a metal compound |
| US10636540B2 (en) | 2015-03-27 | 2020-04-28 | Heraeus Deutschland GmbH & Co. KG | Electro-conductive pastes comprising an oxide additive |
| CN111302620A (en) * | 2018-12-11 | 2020-06-19 | 苏州晶银新材料股份有限公司 | Glass powder composition, conductive silver paste containing glass powder composition and solar cell |
| CN112562884A (en) * | 2019-11-07 | 2021-03-26 | 陕西彩虹新材料有限公司 | Preparation method of low-sheet-resistance conductive silver paste |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077764A (en) * | 2013-02-01 | 2013-05-01 | 李春生 | Electrocondution slurry for front side electrode of solar cell |
| CN103366858A (en) * | 2013-07-08 | 2013-10-23 | 广东羚光新材料股份有限公司 | Silver paste for LED (Light-Emitting Diode) lamp aluminum oxide base and application thereof |
| WO2015003292A1 (en) * | 2013-07-08 | 2015-01-15 | Yu Xiaocui | Composite electrode material and process for preparing front electrode of photovoltaic cell |
| CN103366858B (en) * | 2013-07-08 | 2015-10-14 | 广东羚光新材料股份有限公司 | A kind of LED aluminium oxide pedestal silver slurry and application thereof |
| CN106463198A (en) * | 2014-05-19 | 2017-02-22 | 太阳化学公司 | A silver paste containing bismuth oxide and its use in solar cells |
| US10056508B2 (en) | 2015-03-27 | 2018-08-21 | Heraeus Deutschland GmbH & Co. KG | Electro-conductive pastes comprising a metal compound |
| US10636540B2 (en) | 2015-03-27 | 2020-04-28 | Heraeus Deutschland GmbH & Co. KG | Electro-conductive pastes comprising an oxide additive |
| CN104751942A (en) * | 2015-04-23 | 2015-07-01 | 江苏欧耐尔新型材料有限公司 | Lead-free conductive paste for filament screen printing of solar cells and preparation method of lead-free conductive paste |
| CN104867537A (en) * | 2015-04-23 | 2015-08-26 | 江苏欧耐尔新型材料有限公司 | Low-lead high-sheet-resistance silicon solar battery front-surface silver electrode slurry and preparation method thereof |
| CN104751942B (en) * | 2015-04-23 | 2016-11-30 | 江苏欧耐尔新型材料有限公司 | Solaode fine rule silk screen printing unleaded electrocondution slurry and preparation method thereof |
| CN111302620A (en) * | 2018-12-11 | 2020-06-19 | 苏州晶银新材料股份有限公司 | Glass powder composition, conductive silver paste containing glass powder composition and solar cell |
| CN112562884A (en) * | 2019-11-07 | 2021-03-26 | 陕西彩虹新材料有限公司 | Preparation method of low-sheet-resistance conductive silver paste |
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Application publication date: 20120704 |