CN107545942A - A kind of solar cell front side silver paste slurry - Google Patents
A kind of solar cell front side silver paste slurry Download PDFInfo
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- CN107545942A CN107545942A CN201610466031.5A CN201610466031A CN107545942A CN 107545942 A CN107545942 A CN 107545942A CN 201610466031 A CN201610466031 A CN 201610466031A CN 107545942 A CN107545942 A CN 107545942A
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Abstract
The present invention relates to a kind of solar cell front side silver paste slurry, including the 85wt% of silver powder 75, the 5wt% of glass dust 3 and the 15wt% of organic carrier 10.The silver powder includes following component：The 0.4molL of silver nitrate 0.2‑1, the 1.8molL of reducing agent 1.0‑1, the 10wt% of dispersant 5.The glass dust includes following component：PbO 60 68wt%, SiO220 28wt%, B2O33 4wt%, Al2O33 4wt%, ZnO 2 3wt%, TiO20.5 1wt%.The organic carrier includes following component：The 91wt% of solvent 90, the 7wt% of thickener 5, the 4wt% of thixotropic agent 3.Solar cell front side silver paste slurry viscosity prepared by the present invention is suitably, levelability and thixotropy are good, chemical stability is good, long shelf-life, it is strong that antireflective coating ability is penetrated made of it, the thick film adhesive force of formation is strong, with good Ohmic contact, the cell piece of generation will have good electrical property.
Description
Technical field
The invention belongs to solar cell manufacturing field, and in particular to a kind of solar cell front side silver paste slurry.
Background technology
For the silver powder of solar cell front side silver dress, typically to reach micron or the particle diameter of sub-micron.It is right both at home and abroad
The research of super fine silver powder is more deep, there is a substantial amounts of document report, and some reaches micron order, submicron order, and some even can be with
Reach nanoscale, usually micron or the submicron silver powder of solar cell front side silver dress, the less use of nanometer.Although nanometer
Silver powder is due to easily reuniting in solar cells using less, but its preparation method has very big ginseng to preparing micron/submicron silver powder
Examine value.The research of the external silver powder for solar cell is more ripe；And silver powder made from the country, have a range of
Size and shape, but most dispersivenesses are poor, reunite serious, tap density is low, the requirement with solar cell front side silver paste
Also sizable distance, while also have a certain distance, it is necessary to further in-depth study with world level.For inorganic bond
For agent, mostly using glass dust, system is more, can substantially divide leaded system and lead-free systems, specifically for solar cell just
The research of the glass dust of face snow cover is less, and most research is to be applied to other electronic components.The glass of electronics charging
Powder, foreign study comparative maturity, there is substantial amounts of document report, and be applied in production, though also there are some document reports in China,
It is applied to the industrialization of conductive silver charging also in the starting stage.Organic carrier as dispersible silver powder and the medium of inorganic binder,
The rheological property of slurry is controlled, vital effect is played to the printing performance of charging.Both at home and abroad on solar battery front side
The pertinent literature of the special report of the organic carrier of silver paste is all seldom, needs further in-depth study, and this also has substantial amounts of work
Need to do.
For solar cell, typically Ag slurries are screen printed onto on the Si substrates for having been coated with SiNx antireflective coatings, formed just
The electrode of face grid line and positive and negative, the electricity being transformed for collecting transmission sunshine.This kind of thick film first has to the silk through high resolution
Wire mark brush, so fineness has to small, and the pattern of silver powder, granularity and dispersiveness, the effect of silk-screen printing is directly affected, therefore,
Need the spherical micron/submicron silver powder of obtained high dispersive.In addition, make silver paste that there is suitable viscosity, good levelability and touch
Denaturation.Viscosity is excessive, it is difficult to printed and formed, the defects of forming broken string, breakpoint；Viscosity is too small, and easily trickling, can not form rule
Lines then.Levelability is excessive, easily trickling；Levelability is too small, and the grid line for forming grid line is rough；Thixotropy is too small, Gao Kuan
Than low, the electricity conversion of battery will be relatively low.In addition, the necessary chemical stability of the charging is good, storage life will be grown.Penetrate and subtract
Reflectance coating ability is strong, and the thick film adhesive force of formation is strong, has good Ohmic contact.The cell piece of generation will have good electrical property.
It is not singly being simply mixed for silver powder, glass dust and organic carrier three for charging, but a complicated system,
Proportioning, the preparation technology of three is required for deep exploration.The correlation on solar battery front side silver paste is specially reported both at home and abroad
Document is all less, needs further in-depth study, and this also has substantial amounts of need of work to do.Generally speaking, China's solar cell
The technical merit of positive snow cover and associated materials compared with world level, also exist very big gap, especially silver powder performance, batch
Secondary uniformity, lot stability and production scale etc. are not met by customer demand, really to reach global first-class level and also have
Longer road will be walked.
The content of the invention
In view of the above-mentioned problems, the present invention is intended to provide a kind of viscosity is suitable, levelability and thixotropy are good, chemical stability is good, protects
The solar cell front side silver paste slurry of phase length to be deposited, penetrates that antireflective coating ability is strong made of it, the thick film adhesive force of formation is strong,
With good Ohmic contact, the cell piece of generation will have good electrical property.
A kind of solar cell front side silver paste slurry, including silver powder 75-85wt%, glass dust 3-5wt% and organic carrier 10-15
Wt%.
The silver powder includes following component：Silver nitrate 0.2-0.4molL-1, reducing agent 1.0-1.8molL-1, dispersant 5-10wt%.
One or more of the reducing agent in hydrazine hydrate, ascorbic acid, glucose or formaldehyde.
The dispersant is selected from PVP, gelatin, polyethylene glycol, oleic acid, polyethylene glycol, polyvinyl alcohol, gum arabic, lemon
One or more in sour trisodium or Tween 80.
The glass dust includes following component：PbO 60-68wt%, SiO220-28wt%, B2O33-4wt%, Al2O33-4wt%,
ZnO 2-3wt%, TiO20.5-1wt%.
The organic carrier includes following component：Solvent 90-91wt%, thickener 5-7wt%, thixotropic agent 3-4wt%.
The solvent is selected from Chinese catalpa ATBC, dibutyl phthalate, terpinol, dimethylbenzene, ethyl cellosolve acetate
In one or more.
The thickener is selected from ethyl cellulose, Isobutyl methacrylate, hexyl cellulose, hydroxyethyl cellulose, methyl hydroxyl second
One or more in base cellulose, ethylhydroxyethylcellulose, methylhydroxypropylcellulose.
One or more of the thixotropic agent in polyamide wax, gas phase titanium dioxide baby, organobentonite, rilanit special.
A kind of preparation method of solar cell front side silver paste slurry, comprises the following steps：
I, the preparation of silver powder：
(1) ultra-pure water dissolving silver nitrate, adds dispersant, adjusts pH to 3-5, obtains silver nitrate solution；
(2) ultra-pure water dissolving and reducing agent, pH to 3-5 is adjusted, obtains reductant solution；
(3) silver nitrate solution is added in reductant solution and reacted, centrifuging and taking precipitates after 45-55 DEG C of temperature, fully reaction；
(4) precipitation clean dry obtains silver powder；
II, organic carrier preparation：
Solvent, thickener and thixotropic agent are mixed, heated in 75-85 DEG C of water-bath, stirring and dissolving, standing is cooled to room temperature, i.e.,
Obtain organic carrier；
III, front side silver paste preparation：
Now silver powder and glass dust are well mixed, organic carrier is then added and is well mixed, be ground to fineness and reach required value, produce
To slurry.
Ammoniacal liquor or progress concentrated nitric acid regulation of the pH regulations using 28wt% in the step (1), (2).
Silver nitrate is stirred while being added in the reductant solution stirred in the step (3), and mixing speed is
150-250rpm。
The rate of addition of silver nitrate is 0.6-0.7mLs in the step (3)-1。
In the step (4) washing of precipitate mode be with ultra-pure water agitator treating three times, with absolute ethyl alcohol stir with washing three times.
Precipitation drying mode is to cross 500 mesh sieves in 55-65 DEG C of dry 12-24h in vacuum drying chamber, obtain in the step (4)
It is standby to silver powder.
Solar cell front side silver paste slurry viscosity prepared by the present invention is suitably, levelability and thixotropy are good, chemical stability is good,
Long shelf-life, penetrates that antireflective coating ability is strong made of it, and the thick film adhesive force of formation is strong, has good Ohmic contact, raw
Into cell piece to have good electrical property.
Embodiment
The present invention is described in further details with reference to specific embodiment.
Embodiment 1
I, the preparation of silver powder：Accurate weigh dissolves a certain amount of silver nitrate with ultra-pure water, gelatin is added, with 28wt% ammoniacal liquor
PH value is adjusted to 4, is then diluted to certain volume, it is 0.2molL to make silver nitrate concentration-1, gelatin concentration 5wt%.Accurately
Weigh and dissolve a certain amount of ascorbic acid with ultra-pure water, adjust pH value to 4 with 28wt% ammoniacal liquor, be then diluted to certain body
Product, it is 1.8molL to make ascorbic acid concentrations-1.Stirred with 200rpm while silver nitrate solution is added drop-wise into what is stirred
In reductant solution, rate of addition 0.7mLs-1, continue to stir, temperature is kept for 50 DEG C, continues stirring 3 minutes after dripping off.
With centrifuge by separation of solid and liquid, with ultra-pure water agitator treating precipitation three times, stirred with absolute ethyl alcohol with washing precipitation three times, be placed on vacuum
In 60 DEG C of dry 12h in drying box, 500 mesh standard sieves are crossed, it is standby to obtain silver powder.
The characterisitic parameter for obtaining silver powder powder is：Pattern is spherical, and particle mean size is at 0.85 μm or so, size distribution
0.39-1.01 μm, belong to submicron silver powder, favorable dispersibility, the reunion factor 12.44, tap density 4.9gcm-3, properties
Parameter has all reached target.
II, organic carrier preparation：
Solvent 90wt%, thickener 5wt%, thixotropic agent 3wt% are mixed, heated in 75 DEG C of water-baths, stirring and dissolving, is stood
Room temperature is cooled to, produces organic carrier；
III, front side silver paste preparation：
Now silver powder 75wt% and glass dust glass dust 5wt% are well mixed, organic carrier 15wt% is then added and is well mixed,
It is ground to fineness and reaches required value, that is, obtains slurry.
Embodiment 2
I, the preparation of silver powder：Accurate weigh dissolves a certain amount of silver nitrate with ultra-pure water, adds gelatin, and pH is adjusted with concentrated nitric acid
It is worth 3, is then diluted to certain volume, it is 0.3molL to make silver nitrate concentration-1, gelatin concentration 10wt%.It is accurate weigh by
A certain amount of ascorbic acid is dissolved with ultra-pure water, is adjusted pH value to 3 with 28wt% concentrated nitric acid, is then diluted to certain volume,
It is 1.2molL to make ascorbic acid concentrations-1.Stirred with 250rpm while silver nitrate solution to be added drop-wise to the reduction stirred
In agent solution, rate of addition 0.6mLs-1, continue to stir, temperature is kept for 45 DEG C, continues stirring 4 minutes after dripping off.With from
Separation of solid and liquid with ultra-pure water agitator treating precipitation three times, is stirred with washing precipitation three times, is placed on vacuum drying by scheming with absolute ethyl alcohol
In 65 DEG C of dry 24h in case, 500 mesh standard sieves are crossed, it is standby to obtain silver powder.
The characterisitic parameter for obtaining silver powder powder is：Pattern is spherical, and particle mean size is at 0.81 μm or so, size distribution
0.29-1.01 μm, belong to submicron silver powder, favorable dispersibility, the reunion factor 12.11, tap density 4.8gcm-3, properties
Parameter has all reached target.
II, organic carrier preparation：
Solvent 91wt%, thickener 5wt%, thixotropic agent 4wt% are mixed, heated in 80 DEG C of water-baths, stirring and dissolving, is stood
Room temperature is cooled to, produces organic carrier；
III, front side silver paste preparation：
Now silver powder 77wt% and glass dust glass dust 4wt% are well mixed, organic carrier 12wt% is then added and is well mixed,
It is ground to fineness and reaches required value, that is, obtains slurry.
Embodiment 3
I, the preparation of silver powder：Accurate weigh dissolves a certain amount of silver nitrate with ultra-pure water, gelatin is added, with 28wt% ammoniacal liquor
PH value is adjusted to 5, is then diluted to certain volume, it is 0.4molL to make silver nitrate concentration-1, gelatin concentration 8wt%.Accurately
Weigh and dissolve a certain amount of ascorbic acid with ultra-pure water, adjust pH value to 5 with 28wt% ammoniacal liquor, be then diluted to certain body
Product, it is 1.1molL to make ascorbic acid concentrations-1.Stirred with 150rpm while silver nitrate solution is added drop-wise into what is stirred
In reductant solution, rate of addition 0.7mLs-1, continue to stir, temperature is kept for 55 DEG C, continues stirring 5 minutes after dripping off.
With centrifuge by separation of solid and liquid, with ultra-pure water agitator treating precipitation three times, stirred with absolute ethyl alcohol with washing precipitation three times, be placed on vacuum
In 55 DEG C of dry 18h in drying box, 500 mesh standard sieves are crossed, it is standby to obtain silver powder.
The characterisitic parameter for obtaining silver powder powder is：Pattern is spherical, and particle mean size is at 0.88 μm or so, size distribution
0.31-1.08 μm, belong to submicron silver powder, favorable dispersibility, the reunion factor 12.23, tap density 5.1gcm-3, properties
Parameter has all reached target.
II, organic carrier preparation：
Solvent 90wt%, thickener 5wt%, thixotropic agent 3.4wt% are mixed, heated in 85 DEG C of water-baths, stirring and dissolving is quiet
Put and be cooled to room temperature, produce organic carrier；
III, front side silver paste preparation：
Now silver powder 85wt% and glass dust glass dust 5wt% are well mixed, organic carrier 10wt% is then added and is well mixed,
It is ground to fineness and reaches required value, that is, obtains slurry.
Claims (9)
1. a kind of solar cell front side silver paste slurry, it is characterised in that including silver powder 75-85wt%, glass dust 3-5wt% and organic
Carrier 10-15wt%.
2. solar cell front side silver paste slurry according to claim 1, it is characterised in that the silver powder includes following component：
Silver nitrate 0.2-0.4molL-1, reducing agent 1.0-1.8molL-1, dispersant 5-10wt%.
3. solar cell front side silver paste slurry according to claim 2, it is characterised in that the reducing agent be selected from hydrazine hydrate,
One or more in ascorbic acid, glucose or formaldehyde.
4. solar cell front side silver paste slurry according to claim 2, it is characterised in that the dispersant is selected from PVP, bright
One kind in glue, polyethylene glycol, oleic acid, polyethylene glycol, polyvinyl alcohol, gum arabic, trisodium citrate or Tween 80
It is or several.
5. solar cell front side silver paste slurry according to claim 1, it is characterised in that the glass dust includes following component：
PbO 60-68wt%, SiO220-28wt%, B2O33-4wt%, Al2O33-4wt%, ZnO 2-3wt%, TiO20.5-1wt%.
6. solar cell front side silver paste slurry according to claim 1, it is characterised in that the organic carrier is included with the following group
Part：Solvent 90-91wt%, thickener 5-7%, thixotropic agent 3-4%.
7. solar cell front side silver paste slurry according to claim 6, it is characterised in that the solvent is selected from Chinese catalpa citric acid three
One or more in butyl ester, dibutyl phthalate, terpinol, dimethylbenzene, ethyl cellosolve acetate.
8. solar cell front side silver paste slurry according to claim 6, it is characterised in that the thickener is selected from ethyl cellulose
Element, Isobutyl methacrylate, hexyl cellulose, hydroxyethyl cellulose, methyl hydroxyethylcellulose, ethyl-hydroxyethyl are fine
One or more in dimension element, methylhydroxypropylcellulose.
9. solar cell front side silver paste slurry according to claim 6, it is characterised in that the thixotropic agent be selected from polyamide wax,
One or more in gas phase titanium dioxide baby, organobentonite, rilanit special.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610466031.5A CN107545942A (en) | 2016-06-23 | 2016-06-23 | A kind of solar cell front side silver paste slurry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610466031.5A CN107545942A (en) | 2016-06-23 | 2016-06-23 | A kind of solar cell front side silver paste slurry |
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| CN107545942A true CN107545942A (en) | 2018-01-05 |
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| CN201610466031.5A Withdrawn CN107545942A (en) | 2016-06-23 | 2016-06-23 | A kind of solar cell front side silver paste slurry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108492913A (en) * | 2018-05-16 | 2018-09-04 | 清远市宝晶新材料有限公司 | A kind of crystal silicon solar batteries front side silver paste and preparation method thereof being sintered after laser cutting |
| CN108529889A (en) * | 2018-04-02 | 2018-09-14 | 海宁市丁桥镇永畅知识产权服务部 | A kind of preparation method of solar cell front side silver paste glass powder |
| CN109897389A (en) * | 2017-12-07 | 2019-06-18 | 上海太阳能工程技术研究中心有限公司 | A kind of crystal silicon solar batteries front side silver paste organic carrier and preparation method |
-
2016
- 2016-06-23 CN CN201610466031.5A patent/CN107545942A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109897389A (en) * | 2017-12-07 | 2019-06-18 | 上海太阳能工程技术研究中心有限公司 | A kind of crystal silicon solar batteries front side silver paste organic carrier and preparation method |
| CN108529889A (en) * | 2018-04-02 | 2018-09-14 | 海宁市丁桥镇永畅知识产权服务部 | A kind of preparation method of solar cell front side silver paste glass powder |
| CN108492913A (en) * | 2018-05-16 | 2018-09-04 | 清远市宝晶新材料有限公司 | A kind of crystal silicon solar batteries front side silver paste and preparation method thereof being sintered after laser cutting |
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Application publication date: 20180105 |