CN104347151A - Conductive silver paste and preparation method thereof - Google Patents
Conductive silver paste and preparation method thereof Download PDFInfo
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- CN104347151A CN104347151A CN201310335418.3A CN201310335418A CN104347151A CN 104347151 A CN104347151 A CN 104347151A CN 201310335418 A CN201310335418 A CN 201310335418A CN 104347151 A CN104347151 A CN 104347151A
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Abstract
The invention provides a conductive silver paste used for a solar cell device. The silver paste includes a silver powder, an organic carrier, and a glass powder, wherein the glass powder includes TeO2 with a weight percentage of 20-75%, PbO with a weight percentage of 20-50% and La2O3 with a weight percentage of 1-40%. The invention also provides a preparation method of the conductive silver paste. Through adoption of the conductive silver paste and the preparation method thereof, excellent ohmic contact of a positive silver grid line and a silicon wafer can be realized and particularly, better ohmic contact is formed on high sheet resistance and at the same time, the content of lead compounds in the conductive silver paste is significantly low so that a convention that traditional silver pastes are mostly high-lead glass powders is changed greatly and use of toxic compounds is reduced and pollution of environment is reduced; and at the same time, addition of the La element improves significantly the use reliability of a silicon-based solar cell.
Description
Technical field
The present invention relates to solar energy equipment field, particularly relate to silica-based solar cell positive silver silver slurry and preparation thereof.
Background technology
Along with the shortage of fossil energy and people are to the concern of CO2 emission, solar energy generation technology obtains the development of great-jump-forward.And crystal silicon solar energy battery technology is as the main body of solar energy generation technology, enjoy the concern of people, its photoelectric conversion efficiency is constantly promoted always.
The quality of solar cell, except the carrier concentration depended in used crystal silicon material, distribution and migration rate, is also subject to the impact of battery plus-negative plate electrode performance.Wherein front electrode directly affects series resistance, shunt resistance, fill factor, curve factor and photoelectric conversion efficiency, and therefore the quality of front electrode silver slurry determines the performance of solar cell.
Conductive silver paste mainly comprises three parts, most silver powder, organic carrier and glass dust.In positive silver silver slurry, except main body silver powder, the composition of glass dust and the final efficiency of content on cell piece have very crucial impact.Meanwhile, the glass frit component in silver slurry on the solderability of the silicon based cells grid line made and and the adhesive strength of silicon chip have conclusive impact.Grid line solderability is bad, can affect productive rate and the yield of battery.And the adhesive strength of grid line and silicon chip does not reach certain numerical value, then battery cannot encapsulate and make assembly, also can affect the useful life of battery.
From the trend of current technical development, the square resistance preparing the silicon chip of silica-based solar cell is more and more higher, develops 75-80 ohm/side rapidly from 50-60 ohm/side.This is because the silicon based cells of high square resistance is higher than the silicon based cells of low square resistance in the response in high-octane shortwave district, thus effectively can improve the photoelectric conversion efficiency of silica-based solar cell.But higher surperficial square resistance brings new problem, that is exactly the problem how front silver grating line and silicon chip surface realize ohmic contact.
Mostly the glass dust of conventional silver slurry is high pbo glass powder, by the SiN anti-reflection layer of the lead corrosion silicon chip surface in glass dust, and assists silver powder to form secondary crystallization at silicon face, forms effective ohmic contact.But because sheet resistance is high on high square resistance silicon chip, can only Schottky contacts be formed and cannot ohmic contact be formed in this way.The theory how forming good ohmic contact at present on high square resistance silicon chip is still immature, but from limited result of the test, tellurate glass or the inorganic phase containing tellurium compound are conducive on high square resistance, form good ohmic contact.
Simultaneously in tellurate glass or compound combination, the silver-colored glass dust starched of silver more positive than tradition is low usually for lead content.And lead and compound thereof are hypertoxic heavy metal compound, be one of six kinds of deadly poisonous compounds that RoHS clearly forbids.The use amount reducing plumbous compound is silver slurry developing direction always.
In previous technology, have and propose to utilize tellurate glass powder to prepare the patent of solar cell positive silver silver slurry, but, the glass transition point of tellurate glass is lower, general at 250-300 degree Celsius, and the glass softening point that positive silver silver slurry needs usually should at 350-380 degree Celsius, to coordinate grid line high-temperature sintering process.Meanwhile, the less stable of tellurate glass, or not crystallization, or be exactly a large amount of crystallizatioies.A small amount of crystallization is conducive to the sintering strength of grid line and silicon chip, but large area crystallization can increase the compound of charge carrier at grid line place, reduce the open circuit voltage of silica-based solar cell, thus reduce the photoelectric conversion efficiency of battery, so, silver slurry prepared by tellurate glass powder or efficiency is high and to weld pulling force little, otherwise welding pulling force is large and efficiency is low.Therefore need in tellurate system, add necessary component, effectively control the crystallization of this glass, improve the stability of glass.Thus reach the effect of high efficiency, high welding pulling force.
In view of this, how on high square resistance silicon chip, to form good ohmic contact better, reduce the use amount of plumbous compound simultaneously, improving the serviceability of silicon based cells, is a problem demanding prompt solution.
Summary of the invention
Silica-based solar cell for high square resistance in prior art positive silver silver slurry ohmic contact is bad, the too high levels of lead compound, silicon based cells photoelectric conversion efficiency is not high, and grid line solderability and the too low present situation of pulling force, the invention provides a kind of conductive silver paste and preparation method thereof.
The invention provides a kind of conductive silver paste, for solar battery apparatus, comprise silver powder, organic carrier, and glass dust, wherein, glass dust comprises the TeO of percentage by weight 20-75%
2, the PbO of percentage by weight 20-50%, and the La of percentage by weight 1-40%
2o
3.
Preferably, the glass dust of conductive silver paste also comprises the Bi that percentage by weight is 5-20%
2o
3, percentage by weight is the B of 0-10%
2o
3, the ZnO of percentage by weight 0-10%, percentage by weight is the Al of 0-10%
2o
3, percentage by weight is the SiO of 0-20%
2, and percentage by weight is the Sb of 0-10%
2o
3;
Preferably, the TeO of conductive silver paste
2percentage by weight be the percentage by weight of 30-65%, PbO be 25-40%, La
2o
3percentage by weight be 10-35%.
The present invention also provides a kind of preparation method of conductive silver paste, comprises the following steps:
1) organic carrier heating is stirred to and dissolves completely;
2) by after glass dust Homogeneous phase mixing, be heated to molten condition, obtain vitreum after sudden fire, ball milling vitreum, and sieve, obtained glass powder;
3) by silver powder, consoluet organic carrier, and glass powder mixes and stirs, obtained combined silver slurry;
4) by the fully grinding of combined silver slurry, obtained conductive silver paste slurry.
Preferably, the silver powder in preparation method's step 3) of conductive silver paste, the percentage by weight of organic carrier and glass powder is respectively 80-90%, 5-15% and 0.5-8%;
Preferably, the organic carrier in preparation method's step 1) of conductive silver paste comprises at least one in ethyl cellulose resin, abietic resin, phenolic resins, terpinol, turpentine oil, 1-Methoxy-2-propyl acetate, butyl carbitol, ethylene glycol monomethyl ether acetate, benzinum, ethers, plasticizer or surfactant;
Preferably, preparation method's step 2 of conductive silver paste) in ball milling vitreum reach 0.5-2 μm to Vitrea average grain diameter;
Preferably, preparation method's step 2 of conductive silver paste) in sieve employing 325 ~ 400 eye mesh screen;
Preferably, the silver powder in preparation method's step 3) of conductive silver paste is purity is 99.9-99.999%, and particle mean size is orbicule or the flakey body of 0.5-10 μm;
Preferably, in preparation method's step 4) of conductive silver paste, grinding adopts three-roll grinder, and silver slurry slurry fineness is less than 15 μm.
Prepare in the process of glass dust in the present invention, because reaction temperature is high, all should being included in the compositional range of obtained glass dust as metal chloride, metal fluoride, metal bromide, metal carbonate of this quasi-metal oxides that therefore may be formed by pyroreaction in sintering procedure.
The present invention adopts a kind of novel tellurides inorganic system, and this inorganic system is Te-Pb-La-O system, and lead content is lower, lower than 50% of total amount, lead is weakened the corrosion of silicon chip, avoids puncturing PN junction.Meanwhile, rare earth La series metal oxide, because of its distinctive catalytic action, can control the crystalline rate of tellurate glass effectively.By controlling the addition of rare earth compound La, not only effectively can improve the photoelectric conversion efficiency of silicon based cells, meanwhile, drastically increasing solderability and the pulling force of grid line.
Adopt conductive silver paste of the present invention and preparation method thereof, front silver grating line and silicon chip can be made to realize good ohmic contact, especially on high square resistance, better ohmic contact is formed, simultaneously, in conductive silver paste of the present invention, Pb compound content is very low, greatly change the routine mostly conventional silver slurry is high pbo glass powder, reduce the use of deadly poisonous compound, reduce the pollution to environment.Simultaneously La element add the serviceability substantially increasing silica-based solar cell.
Embodiment
In order to more clearly understand technology contents of the present invention, below embodiments of the present invention are described in further detail.
The silica-based solar cell positive silver silver slurry ohmic contact of high square resistance is bad, the too high levels of lead compound, the glass transition point of tellurate glass is lower, less stable, the invention provides a kind of conductive silver paste and preparation method thereof, introduces the Te-Pb-La-O inorganic system of rare earth compound La, comprise the silver powder that percentage by weight is 80-90%, percentage by weight is the organic carrier of 5-15% and percentage by weight is the glass dust of 0.5-8%, and wherein, glass dust comprises the TeO of percentage by weight 20-75%
2, the PbO of percentage by weight 20-50%, and the La of percentage by weight 1-40%
2o
3, percentage by weight is the Bi of 5-20%
2o
3, percentage by weight is the B of 0-10%
2o
3, the ZnO of percentage by weight 0-10%, percentage by weight is the Al of 0-10%
2o
3, percentage by weight is the SiO of 0-20%
2, and percentage by weight is the Sb of 0-10%
2o
3.
In embodiment use silver powder purchased from the manufacturer of professional production silver slurry silver powder, TeO
2, La
2o
3deng chemicals all purchased from Shanghai traditional Chinese medicines group.
Embodiment 1
A kind of solar cell front side silver paste, comprise the component of following percetage by weight: 88% silver powder, 3% glass dust, 9% organic carrier, wherein, glass dust comprises the following component accounting for glass dust percentage by weight: 30%TeO
2, 40%PbO, 2.5%La
2o
3, 5.0%Bi
2o
3, 5.0%ZnO, 6.0%Al
2o
3, 4.5%SiO
2, 2.0%Sb
2o
3, 5.0%Li
2o, organic carrier comprises the following component of occupying airborne body weight percentage: 8% ethyl cellulose resin, 5% abietic resin, 5% phenolic resins, 82% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of embodiment 1 comprises the following steps:
(1) preparation of organic carrier: by 8g ethyl cellulose resin, 58g abietic resin, 5g phenolic resins, join in 82ml organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate), stir 2 hours at 90 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) preparation of glass dust: 1) take raw material by the component of following percentage by weight: 30%TeO
2, 40%PbO, 2.5%La
2o3,5.0%Bi
2o
3, 5.0%ZnO, 6.0%Al
2o
3, 4.5%SiO
2, 2.0%Sb
2o
3, 5.0%Li
2o; 2) above-mentioned raw materials Homogeneous phase mixing is placed in high temperature Muffle furnace, melting 1 hour at 1000 DEG C, glass after fusing is melted after slurry pours deionization quenching-in water into, be milled to particle mean size 1 μm, then sieve through 325 ~ 400 eye mesh screens that can to obtain glass powder for subsequent use.
(3) mixing of silver slurry: stir after 880g silver powder, 90g step (1) gained organic carrier, the mixing of 30g step (2) gained glass dust, obtain uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 15 μm by Hegman fineness grind agent measurement fineness, i.e. obtained front side silver paste slurry of the present invention.
Embodiment 2
A kind of solar cell front side silver paste, comprise the component of following percetage by weight: 83% silver powder, 2% glass dust, 15% organic carrier, wherein, glass dust comprises the following component accounting for glass dust percentage by weight: 40%TeO
2, 20%PbO, 15%La
2o
3, 6.5%Bi
2o
3, 3%B
2o
3, 7.0%ZnO, 4.0%Al
2o
3, 4.5%SiO
2organic carrier comprises the following component of occupying airborne body weight percentage: 9% ethyl cellulose resin, 2% abietic resin, 6% phenolic resins, 83% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of embodiment 2 comprises the following steps:
(1) preparation of organic carrier: by 9g ethyl cellulose resin, 2g abietic resin, 6g phenolic resins, join the mixture of 83ml organic solvent 45% terpinol, 25% ethylene glycol monomethyl ether acetate, 30% 1-Methoxy-2-propyl acetate) in, stir 2 hours at 90 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) preparation of glass dust: 1) take raw material by the component of following percentage by weight: 40%TeO
2, 20%PbO, 15%La
2o
3, 6.5%Bi
2o
3, 3%B
2o
3, 7.0%ZnO, 4.0%Al
2o
3, 4.5%SiO
2; 2) above-mentioned raw materials Homogeneous phase mixing is placed in high temperature Muffle furnace, melting 1 hour at 1000 DEG C, glass after fusing is melted after slurry pours deionization quenching-in water into, be milled to particle mean size 1 μm, then sieve through 325 ~ 400 eye mesh screens that can to obtain glass powder for subsequent use.
(3) mixing of silver slurry: stir after 830g silver powder, 150g step (1) gained organic carrier, the mixing of 20g step (2) gained glass dust, obtain uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 15 μm by Hegman fineness grind agent measurement fineness, i.e. obtained front side silver paste slurry of the present invention.
Embodiment 3
A kind of solar cell front side silver paste, comprise the component of following percetage by weight: 89% silver powder, 3% glass dust, 8% organic carrier, wherein, glass dust comprises the following component accounting for glass dust percentage by weight: 36.5%TeO
2, 28%PbO, 25%La
2o3,5.0%Bi
2o
3, 2%ZnO, 2%Al
2o
3, 1.5%SiO
2organic carrier comprises the following component of occupying airborne body weight percentage: 7% ethyl cellulose resin, 2% abietic resin, 6% phenolic resins, 85% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of embodiment 3 comprises the following steps:
(1) preparation of organic carrier: by 7g ethyl cellulose resin, 2g abietic resin, 6g phenolic resins, join in 85ml organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate), stir 2 hours at 90 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) preparation of glass dust: 1) take raw material by the component of following percentage by weight: 36.5%TeO
2, 28%PbO, 25%La
2o3,5.0%Bi
2o
3, 2%ZnO, 2%Al
2o
3, 1.5%SiO
2; 2) above-mentioned raw materials Homogeneous phase mixing is placed in high temperature Muffle furnace, melting 1 hour at 1000 DEG C, glass after fusing is melted after slurry pours deionization quenching-in water into, be milled to particle mean size 1 μm, then sieve through 325 ~ 400 eye mesh screens that can to obtain glass powder for subsequent use.
(3) mixing of silver slurry: stir after 890g silver powder, 80g step (1) gained organic carrier, the mixing of 30g step (2) gained glass dust, obtain uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 15 μm by Hegman fineness grind agent measurement fineness, i.e. obtained front side silver paste slurry of the present invention.
Embodiment 4
A kind of solar cell front side silver paste, comprise the component of following percetage by weight: 83% silver powder, 2% glass dust, 15% organic carrier, wherein, glass dust comprises the following component accounting for glass dust percentage by weight: 45%TeO
2, 25%PbO, 20%La
2o3,4.5%Bi
2o
3, 2.5%Al
2o
3, 0.5%Sb
2o
32.5%ZnO organic carrier comprises the following component of occupying airborne body weight percentage: 8% ethyl cellulose resin, 1% abietic resin, 2% phenolic resins, 89% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of embodiment 4 comprises the following steps:
(1) preparation of organic carrier: by 16g ethyl cellulose resin, 2g abietic resin, 4g phenolic resins, join in 178ml organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate), stir 2 hours at 90 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) preparation of glass dust: 1) take raw material by the component of following percentage by weight: 45%TeO2,25%PbO, 20%La2O3,4.5%Bi2O3,2.5%Al2O3,0.5%Sb2O3,2.5%ZnO; 2) above-mentioned raw materials Homogeneous phase mixing is placed in high temperature Muffle furnace, melting 1 hour at 1000 DEG C, glass after fusing is melted after slurry pours deionization quenching-in water into, be milled to particle mean size 1 μm, then sieve through 325 ~ 400 eye mesh screens that can to obtain glass powder for subsequent use.
(3) mixing of silver slurry: stir after 830g silver powder, 150g step (1) gained organic carrier, the mixing of 20g step (2) gained glass dust, obtain uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 10 μm by Hegman fineness grind agent measurement fineness, i.e. obtained front side silver paste slurry of the present invention.
Embodiment 5
A kind of solar cell front side silver paste, comprise the component of following percetage by weight: 88% silver powder, 3% glass dust, 9% organic carrier, wherein, described glass dust comprises the following component accounting for glass dust percentage by weight: 55%TeO
2, 30%PbO, 5%La
2o
3, 5%Bi
2o
3, 2%SiO
2, 2.0%Al
2o
3, 1.0%Sb
2o
3organic carrier comprises the following component of occupying airborne body weight percentage: 10% ethyl cellulose resin, 8% abietic resin, 2% phenolic resins, 80% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of embodiment 5 comprises the following steps:
(1) preparation of organic carrier: by 10g ethyl cellulose resin, 8g abietic resin, 2g phenolic resins, join in 80ml organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate), stir 2 hours at 1000 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) preparation of glass dust: 1) take raw material by the component of following percentage by weight: 55%TeO
2, 30%PbO, 5%La
2o
3, 5%Bi
2o
3, 2%SiO
2, 2.0%Al
2o
3, 1.0%Sb
2o
3; 2) above-mentioned raw materials Homogeneous phase mixing is placed in high temperature Muffle furnace, melting 1 hour at 1000 DEG C, glass after fusing is melted after slurry pours deionization quenching-in water into, be milled to particle mean size 1 μm, then sieve through 325 ~ 400 eye mesh screens that can to obtain glass powder for subsequent use.
(3) mixing of silver slurry: stir after 880g silver powder, 90g step (1) gained organic carrier, the mixing of 30g step (2) gained glass dust, obtain uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 15 μm by Hegman fineness grind agent measurement fineness, i.e. obtained front side silver paste slurry of the present invention.
Comparative example:
A kind of conventional front side silver paste prepared by high pbo glass powder is as a comparison case:
Comprise the component of following percetage by weight: 88% silver powder, 3% glass dust, 9% organic carrier, wherein, glass dust to be particle mean size the be commercialization high pbo glass powder of 1-1.5 μm, purchased from external professional Yin Jiang glass dust manufacturer, organic carrier comprises the following component of occupying airborne body weight percentage: 10% ethyl cellulose resin, 8% abietic resin, 2% phenolic resins, 80% organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate).
The preparation method of the cell front side silver paste of comparative example comprises the following steps:
(1) preparation of organic carrier: by 10g ethyl cellulose resin, 8g abietic resin, 2g phenolic resins, join in 80ml organic solvent (mixture of 50% terpinol, 22% ethylene glycol monomethyl ether acetate, 28% 1-Methoxy-2-propyl acetate), stir 2 hours at 1000 DEG C, after dissolving, obtain the organic carrier of homogeneous transparent;
(2) glass dust is bought: the preferably high pbo glass powder of external Yin Jiang glass dust manufacturer, particle mean size control 1-1.5 μm.
(3) mixing of silver slurry: stir after the mixing of the glass dust of 880g silver powder, 90g step (1) gained organic carrier, 30g step (2), obtains uniform combined silver slurry;
(4) dispersion of silver slurry: 1000g combined silver slurry obtained for step (3) is put into the abundant grinding of three-roll grinder 5 times, is ground to outward appearance exquisiteness, evenly without obvious particle.After being less than 15 μm by Hegman fineness grind agent measurement fineness, i.e. the front side silver paste slurry of obtained comparative example.
The performance test results and evaluation:
Using silver obtained according to the method described above slurry as front slurry, with 400 order silk screen printings be on the 125*125 monocrystalline silicon piece of 175 μm-185 μm in thickness, the equal >80 ohm/side of sheet resistivity of this single-crystal wafer, makes test material after drying, sintering.
The method of testing of resulting materials and test result are all from solar energy research institute of Shanghai Communications University.
The every test result of silver slurry slurry of embodiment 1-5 is in Table 1-2.
Table 1 is the every electrical property average of silver slurry slurry
| Model | Voc | Isc | Vmax | Imax | Pmax | Eff | FF | Rs | Rsh | Irev | Sun |
| 1 | 0.6274 | 5.9002 | 0.5180 | 5.4978 | 2.8479 | 0.1839 | 0.7694 | 0.0102 | 36.0297 | 0.4321 | 1000 |
| 2 | 0.6266 | 5.8614 | 0.5209 | 5.4645 | 2.8465 | 0.1838 | 0.7750 | 0.0098 | 8.7367 | 0.3174 | 1000 |
| 3 | 0.6280 | 5.9244 | 0.5150 | 5.5448 | 2.8558 | 0.1845 | 0.7676 | 0.0107 | 19.7650 | 0.3394 | 1000 |
| 4 | 0.6281 | 5.9262 | 0.5181 | 5.5270 | 2.8637 | 0.1850 | 0.7693 | 0.0103 | 10.6834 | 0.3540 | 1000 |
| 5 | 0.6239 | 5.8313 | 0.5195 | 5.4449 | 2.8284 | 0.1827 | 0.7774 | 0.0096 | 26.2963 | 0.3760 | 1000 |
| Comparative example | 0.6072 | 3.7127 | 0.3661 | 2.1001 | 0.7688 | 0.0497 | 0.3410 | 0.0880 | 0.2720 | 0.4370 | 1000 |
Wherein, Model: sample; Voc: open circuit voltage; Isc: short circuit current; Vmax: optimum operating voltage; Imax: recommended current; Pmax: maximum power; Eff: conversion efficiency; FF: fill factor, curve factor; Rs: series resistance; Rsh: parallel resistance; Irev: reverse leakage; EnvTemp: ambient temperature; Sun: sun light intensity.
Table 2 is cell piece pulling force mean value
| Sample | Pulling force mean value (N) |
| 1 | 4 |
| 2 | 3.5 |
| 3 | 3.5 |
| 4 | 4.5 |
| 5 | 3.5 |
As can be seen from the test result of table 1, the present invention passes through to reduce the lead content in glass dust, and by adding appropriate TeO
2and La
2o
3two kinds of main components, ensure that silicon chip surface SiN anti-reflection layer corrodes, while facilitating the formation of argentalium alloy, slow down the plumbous corrosion to silicon chip, gained silver slurry slurry can be applied on the silicon based cells of high square resistance, and every electrical property all reach higher level, particularly photoelectric conversion efficiency (Eff) value, reach 18.50%, effectively improve solar cell transformation efficiency.Be finally comparative example, can be clear that, silver slurry slurry prepared by conventional high pbo glass powder can not be useful on the silica-based solar cell of high square resistance completely.
As can be seen from the test result of table 2, the present invention by adding appropriate TeO in glass dust
2, and be equipped with appropriate La
2o
3its mean value of welding of battery film pulling force after silver slurry slurry of the present invention is sintered on the solar cell can reach 4.5N, thus solve the problem of the welding pulling force difference that tellurate glass powder causes because of corrosivity difference, greatly improve stability and the useful life of prepared silica-based solar cell, in addition due to appropriate La
2o
3add, effectively extend sintering temperature, ensure that the stability of properties of product.
Be described above the specific embodiment of the present invention.But those of ordinary skill in the art can be understood, when without departing from the spirit and scope of the present invention, various change and replacement can also be done to the specific embodiment of the present invention.These change and replacement all drops in the scope of claims of the present invention restriction.
Claims (10)
1. a conductive silver paste, for solar battery apparatus, comprises silver powder, organic carrier, and glass dust, it is characterized in that, described glass dust comprises the TeO of percentage by weight 20-75%
2, the PbO of percentage by weight 20-50%, and the La of percentage by weight 1-40%
2o
3.
2. conductive silver paste as claimed in claim 1, it is characterized in that, described glass dust also comprises the Bi that percentage by weight is 5-20%
2o
3, percentage by weight is the B of 0-10%
2o
3, the ZnO of percentage by weight 0-10%, percentage by weight is the Al of 0-10%
2o
3, percentage by weight is the SiO of 0-20%
2, and percentage by weight is the Sb of 0-10%
2o
3.
3. conductive silver paste as claimed in claim 1, is characterized in that, described TeO
2percentage by weight be 30-65%, the percentage by weight of described PbO is 25-40%, described La
2o
3percentage by weight be 10-35%.
4. a preparation method for conductive silver paste as claimed in claim 1, is characterized in that, comprises the following steps:
1) heating of described organic carrier is stirred to dissolves completely;
2) by after described glass dust raw material Homogeneous phase mixing, be heated to molten condition, obtain vitreum after sudden fire, vitreum described in ball milling, and sieve, obtained glass powder;
3) by described silver powder, consoluet described organic carrier in described step 1), and described step 2) in glass powder mix and stir, obtained combined silver slurry;
4) by the fully grinding of described combined silver slurry, obtained conductive silver paste slurry.
5. the preparation method of conductive silver paste as claimed in claim 4, it is characterized in that, the described silver powder in described step 3), the percentage by weight of described organic carrier and described glass powder is respectively 80-90%, 5-15% and 0.5-8%.
6. the preparation method of conductive silver paste as claimed in claim 4, it is characterized in that, the organic carrier in described step 1) comprises at least one in ethyl cellulose resin, abietic resin, phenolic resins, terpinol, turpentine oil, 1-Methoxy-2-propyl acetate, butyl carbitol, ethylene glycol monomethyl ether acetate, benzinum, ethers, plasticizer or surfactant.
7. the preparation method of conductive silver paste as claimed in claim 4, is characterized in that, described step 2) in vitreum to described Vitrea average grain diameter described in ball milling reach 0.5-2 μm.
8. the preparation method of conductive silver paste as claimed in claim 4, is characterized in that, described step 2) in sieve employing 325 ~ 400 eye mesh screen.
9. the preparation method of conductive silver paste as claimed in claim 4, it is characterized in that, the silver powder in described step 3) is purity is 99.9-99.999%, and particle mean size is orbicule or the flakey body of 0.5-10 μm.
10. the preparation method of conductive silver paste as claimed in claim 4, is characterized in that, in described step 4), grinding adopts three-roll grinder, and described silver slurry slurry fineness is less than 15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310335418.3A CN104347151A (en) | 2013-08-02 | 2013-08-02 | Conductive silver paste and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105097070A (en) * | 2015-07-22 | 2015-11-25 | 深圳市春仰科技有限公司 | Positive conductive silver pulp of solar cell and preparation method of positive conductive silver pulp |
| CN106205777A (en) * | 2016-08-16 | 2016-12-07 | 中国振华集团云科电子有限公司 | Anti-stick formula of piezo silver slurry burnt in a heap and preparation method thereof |
| CN112542261A (en) * | 2020-11-23 | 2021-03-23 | 苏州大学张家港工业技术研究院 | Conductive silver paste for 5G device and preparation method and application thereof |
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| CN102971268A (en) * | 2010-05-04 | 2013-03-13 | E·I·内穆尔杜邦公司 | Thick-film pastes containing lead-tellurium-lithium-oxides, and their use in the manufacture of semiconductor devices |
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| CN102971268A (en) * | 2010-05-04 | 2013-03-13 | E·I·内穆尔杜邦公司 | Thick-film pastes containing lead-tellurium-lithium-oxides, and their use in the manufacture of semiconductor devices |
| CN101887764A (en) * | 2010-06-28 | 2010-11-17 | 彩虹集团公司 | Method for preparing silicon-based solar front silver paste |
| US20130037096A1 (en) * | 2011-08-11 | 2013-02-14 | E I Du Pont De Nemours And Company | Thick film paste containing lead-tellurium-lithium-titanium-oxide and its use in the manufacture of semiconductor devices |
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| CN105097070A (en) * | 2015-07-22 | 2015-11-25 | 深圳市春仰科技有限公司 | Positive conductive silver pulp of solar cell and preparation method of positive conductive silver pulp |
| CN105097070B (en) * | 2015-07-22 | 2017-05-31 | 深圳市春仰科技有限公司 | Solar battery front side conductive silver paste and preparation method thereof |
| CN106205777A (en) * | 2016-08-16 | 2016-12-07 | 中国振华集团云科电子有限公司 | Anti-stick formula of piezo silver slurry burnt in a heap and preparation method thereof |
| CN112542261A (en) * | 2020-11-23 | 2021-03-23 | 苏州大学张家港工业技术研究院 | Conductive silver paste for 5G device and preparation method and application thereof |
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