CN103065702B - A kind of crystal silicon solar energy battery aluminium paste and preparation method thereof - Google Patents
A kind of crystal silicon solar energy battery aluminium paste and preparation method thereof Download PDFInfo
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Abstract
A kind of crystal silicon solar energy battery aluminium paste and preparation method thereof, aluminium paste pulp furnish is by following weight parts: al powder mixt 60 ~ 80 parts, inorganic bond 2 ~ 6 parts, inert component 0.1 ~ 3 part, organic carrier 15 ~ 35 parts, organic additive 0.5 ~ 5 part.Preparation method comprises: 1). and prepared by inorganic bond; 2). prepared by organic carrier; 3). prepared by al powder mixt; 4). prepared by aluminium paste: take raw material by formula ratio; Al powder mixt, inorganic bond and inert component are mixed, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mixes, obtain mixed slurry; Ground by slurry with three-roll grinder, control slurry fineness < 25 μm, slurry viscosity is 30 ~ 45pa.s; 5). vacuum froth breaking; Obtain aluminium paste product.It can take into account high-photoelectric transformation efficiency and low warp value simultaneously, and have that production cost is low, environment-protecting asepsis, strong adhesion, processing ease, the feature such as reliable and practical.
Description
Technical field
The present invention relates to aluminium paste, specifically a kind of crystal silicon solar energy battery aluminium paste, and the preparation method of this aluminium paste.
Background technology
Solar cell power generation has the advantage not available for other generation mode, such as not consume fuel, scale can flexible combination, by region restriction, the equipment construction cycle is short, construction cost is low, noiselessness, pollution-free, safe and reliable, safeguard simple etc., have the prospect of large-scale application.Along with being becoming tight day of conventional energy resource in recent years, solar cell power generation more and more receives the concern of people.In the near future, solar cell power generation will occupy the important seat of energy-consuming, can start a huge market thus.When the time comes, developing rapidly along with solar cell industry, market also can promptly increase the demand of solar energy electronic slurry, and the primary electron slurry that aluminium paste uses as solar cell manufacture, the market demand in its future will increase day by day.
When manufacturing crystal silicon solar energy battery, silk screen is utilized aluminium paste to be printed on the back side of silicon chip, through techniques such as super-dry, sintering, coolings, make the silicon-aluminum alloy formed in sintering process effectively can eliminate Schottky barrier between silicon chip and electrode, realize good ohmic contact, cooled silicon chip is formed the silicon epitaxial layer doped with aluminium, be i.e. back surface field layer (BSF), effectively can improve the open circuit voltage of battery, realize high photoelectric conversion efficiency.Through aforesaid crystal silicon solar energy battery manufacture process, we can clearly know, the photoelectric conversion efficiency of crystal silicon solar energy battery is high and low, and key depends on the aluminium paste be attached on silicon chip.Therefore, in order to improve the photoelectric conversion efficiency of crystal silicon solar energy battery, people have done large quantifier elimination to the formula of aluminium paste and preparation method, disclosed " a kind of composition of electrode paste of silicon solar cell and the preparation method " (publication number: CN101651155 of such as Chinese patent literature, publication date: on February 17th, 2010), " a kind of environment protection type silicon solar cell back electric field aluminum pulp and manufacture method thereof " (publication number: CN101425545, publication date: on May 6th, 2009), these technology are to add III major element (gallium in aluminium paste, indium, thallium) method improve the back surface field layer of silicon chip, thus improve the photoelectric conversion efficiency of battery, but, III major element not only exist cost high, affect the problems such as aluminium back surface field adhesive force (III major element belongs to soft metal), and more seriously, its toxicity is very large, can not meet environmental requirement, thus, III major element is not desirable additive at all.In addition, also the technology preparing aluminium paste with high-purity aluminium powder (active aluminium content >=99.8%) is had, such as Chinese patent literature disclosed " a kind of crystal silicon solar energy battery aluminium paste composition and preparation method thereof " (publication number: CN101728439, publication date: on June 9th, 2010), the aluminium paste that this technology obtains directly effectively can promote the photoelectric conversion efficiency of battery really; But adopt high-purity aluminium powder to prepare aluminium paste completely, so the preparation cost of aluminium paste is very expensive, be that aluminium paste manufacturing enterprise can not bear.
Aluminium paste research being improved except the photoelectric conversion efficiency of battery except considering, also needing the warp value considering to reduce cell silicon chip.This is because photoelectric conversion efficiency is high again, solution warp value not yet in effect, larger warp value can cause battery component to there is higher fragment rate in process of production, and the battery component percent defective produced is high, increases entreprise cost.The warpage main cause of cell silicon chip is, due to back side aluminium lamination and battery silicon layer in the cooling procedure after sintering deformation difference caused by; The metal paste used from front is different, and back side aluminium paste covers the overwhelming majority surface of positive pole silicon chip, and the thermal coefficient of expansion of aluminium and silicon is respectively 23 × 10
-6k
-1with 3.5 × 10
-6k
-1due to larger thermal expansion coefficient difference, make the cell silicon chip after sintering in cooling procedure, much larger than the contraction efficiency of silicon layer of the contraction efficiency of aluminium lamination, after chilling temperature is lower than the temperature 577 DEG C of sial eutectic, the sial of molten state solidifies, and silicon layer and aluminium lamination, owing to being connected by silicon-aluminum layer, relative displacement can not occur, after this, difference in contraction will cause junction to produce stress, finally cause cell silicon chip to bend, can not qualified finished product.Chinese patent literature discloses a kind of name and is called " back field aluminum paste composition of solar battery and preparation method thereof " (publication number: CN101916610, publication date: on December 15th, 2010) technology, this technology reaches with rational aluminium powder proportioning the object reducing battery silicon warp value; But, can the proportioning of aluminium powder be not only related to the warp value of cell silicon chip, and form coherent conductive path characteristic have material impact to aluminium film surface after sintering, and therefore its operation easier is large, very limited to the effect reducing battery silicon warp value, practicality andreliabiliry is poor.In addition, Chinese patent literature also discloses " a kind of back surface field aluminum paste of solar battery " (publication number: CN101826564, publication date: on September 8th, 2010), " a kind of back aluminum slurry for environment-friendly silicon-based solar battery and preparation method thereof " (publication number: CN101866705, publication date: on October 20th, 2010), these technology reach by the adjustment coefficient of expansion of glass dust and the addition of glass dust the object reducing battery silicon warp value; But, the glass dust being applied to aluminium paste requires to have good wettability, and softening temperature, the levelling temperature to match with sintering process, and reliable adhesive force can be provided, these requirements limit the coefficient of expansion of glass dust and the adjustment of addition to a certain extent, increase operation easier large, very limited to the effect reducing battery silicon warp value, practicality andreliabiliry is poor.
In sum, there are problems in existing crystal silicon solar energy battery aluminium paste technology, such as high-photoelectric transformation efficiency and low warp value can not be taken into account, production cost is high, not environmentally, the problem such as operation easier is large, practicality andreliabiliry is poor, the requirement in market can not be met.
Summary of the invention
The object of the invention is to: for above-mentioned the deficiencies in the prior art, there is provided that a kind of high-photoelectric transformation efficiency and low warp value can be taken into account simultaneously, production cost is low, environment-protecting asepsis, strong adhesion, processing ease, reliable and practical crystal silicon solar energy battery aluminium paste, and the preparation method of this aluminium paste.
The technical solution used in the present invention is, a kind of crystal silicon solar energy battery aluminium paste, and the pulp furnish of described aluminium paste is by following weight parts:
Al powder mixt 60 ~ 80 parts,
Inorganic bond 2 ~ 6 parts,
Inert component 0.1 ~ 3 part,
Organic carrier 15 ~ 35 parts,
Organic additive 0.5 ~ 5 part.
Described al powder mixt is made up of the general spherical shape aluminium powder of active aluminium content >=98% and the high pure spherical aluminium powder of active aluminium content >=99.8%; Wherein, described general spherical shape aluminium powder is divided into two kinds according to the difference of particle diameter; The concrete pulp furnish of described al powder mixt is by following mass percent:
The general spherical shape aluminium powder 10 ~ 40% of particle diameter 1 ~ 3 μm,
The general spherical shape aluminium powder 40 ~ 70% of particle diameter 5 ~ 6 μm,
High pure spherical aluminium powder 3 ~ 20%.
The particle diameter of described high pure spherical aluminium powder is 4 ~ 6 μm.
The particle diameter < of described inorganic bond 10 μm; The concrete pulp furnish of described inorganic bond is by following mass percent:
Bismuth oxide 30 ~ 70%,
Zinc oxide 10 ~ 25%,
Diboron trioxide 5 ~ 20%,
Silicon dioxide 5 ~ 15%,
Alundum (Al2O3) 1 ~ 10%.
The particle diameter of described inert component is 3 ~ 5 μm; Described inert component is one or more the mixture in aluminium oxide, carborundum, silicon nitride, zinc oxide, zirconia.
The pulp furnish of described organic carrier is by following mass percent:
Turpentine oil 5 ~ 15%,
Phenmethylol 3 ~ 10%,
Butyl 10 ~ 30%,
Butyl acetate 20 ~ 40%,
Tributyl citrate 15 ~ 30%,
Ethyl cellulose 2 ~ 7%.
Described organic additive is one or more the mixture in Si Ban-85, lecithin, Borate Ester as Coupling, silane coupler, levelling agent.
A preparation method for above-mentioned crystal silicon solar energy battery aluminium paste, specifically comprises the following steps:
1). prepared by inorganic bond
The raw material of inorganic bond is taken by formula ratio; Raw material is mixed; The raw material mixed is joined in platinum crucible, heats platinum crucible with high temperature furnace, make mixed material temperature >=1300 DEG C in platinum crucible, insulation, temperature retention time >=30min; By the shrend of high temperature mixed material, obtain glass particle material; Glass particle material is dry; By the ball mill grinding of dried glass particle material, make its particle diameter < 10 μm; Obtain inorganic bond;
2). prepared by organic carrier
The raw material of organic carrier is taken by formula ratio; Mixed by raw material, join in reactor after mixing and heat, make material temperature >=80 DEG C in reactor, under the condition of rotating speed >=60r/min, lasting mixing at least 2h, makes the raw material in reactor fully dissolve mixing; Reactor stops heating, the dissolving mixt in reactor is cooled, chilling temperature≤30 DEG C, adopts 260 ~ 300 object stainless steel wires to consider net filtration, clarification; Obtain transparent organic carrier;
3). prepared by al powder mixt
The raw material of al powder mixt is taken by formula ratio; Raw material is mixed;
4). prepared by aluminium paste
Al powder mixt, inorganic bond, inert component, organic additive, organic carrier raw material is taken by formula ratio; Al powder mixt, inorganic bond and inert component are mixed, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mix, incorporation time >=10min, makes them mix, obtains mixed slurry; Adopt three-roll grinder to be ground by slurry, control the fineness < 25 μm of slurry, the viscosity of slurry is 30 ~ 45pa.s;
5). vacuum froth breaking
Adopt vacuum Defoaming machine that slurry good for grinding distribution is carried out froth breaking; Obtain aluminium paste product.
Raw material in described inorganic bond preparation process mixes, and is to be joined in V-type batch mixer by raw material to mix, incorporation time >=20min.
Al powder mixt, inorganic bond and inert component in described aluminium paste preparation process mix, and are al powder mixt, inorganic bond and inert component to be joined V-type to mix in powder machine and mix, incorporation time >=30min.
The invention has the beneficial effects as follows:
1. under rational pulp furnish prerequisite, by carrying out compatibility adjustment to the particle diameter of al powder mixt and proportioning, the aluminium film be attached on silicon chip after making the aluminium paste sintering made is finer and close, even, and then improve the conductivity of battery, and ensure the stability of battery conductive, thus making the aluminium paste of low cost realize high-photoelectric transformation efficiency on battery, cost performance is good; By the inert component added, effectively can reduce the warp value of cell silicon chip, enable the battery produced take into account high-photoelectric transformation efficiency and low warp value simultaneously, and then improve battery qualification rate, reduce entreprise cost;
2. harmful substance and the compounds thereof such as the inorganic bond in aluminium paste raw material is not leaded, mercury, chromium, vanadium, thallium, the aluminium paste environmental protection of making, nontoxic, meet the requirement of European Union ROSH; In addition, Particle size requirements wider range of inorganic bond, the aluminium paste made does not play aluminium pill, aluminium bag, does not play ash during assembly, the strong adhesion on silicon chip, and reliability is high, and the battery comprehensive electrochemical properties made is high and stable, practical;
3. preparation method can make inert component be dispersed between the particle of (especially grinding step) aluminium powder uniformly, thus in cooling procedure after high temperature sintering, the undue warpage of silicon chip caused because the combination of aluminum particle is shunk effectively can be controlled by inert component, reach the object reducing silicon warp value, reduce fragment rate, whole preparation process is simple, easy to operate.
Embodiment
Describe the present invention in detail below by specific embodiment, the content of each embodiment, only as understanding content of the present invention, should not be construed as limiting the scope of the invention.
Embodiment 1
Pulp furnish of the present invention is by following weight parts.
Al powder mixt: 70 parts; The concrete pulp furnish of these 70 parts of al powder mixts is (by mass percentage): the general spherical shape aluminium powder 30%(of particle diameter 1 ~ 3 μm that is 21 parts), the general spherical shape aluminium powder 60%(that is 42 parts of particle diameter 5 ~ 6 μm), the high pure spherical aluminium powder 10%(that is 7 parts of particle diameter 4 ~ 6 μm); Active aluminium content >=98% of described general spherical shape aluminium powder, active aluminium content >=99.8% of described high pure spherical aluminium powder;
Inorganic bond: 5 parts; The concrete pulp furnish of these 5 portions of inorganic bonds is (by mass percentage): bismuth oxide is 50%(that is 2.5 parts), zinc oxide 20%(that is 1 part), diboron trioxide 10%(that is 0.5 part), silica 1 5%(that is 0.75 part), alundum (Al2O3) 5%(that is 0.25); The particle diameter of inorganic bond is < 10 μm;
Inert component: 1.5 parts; These 1.5 parts of inert components are mixtures of silicon nitride (1 part) and aluminium oxide (0.5 part); The particle diameter of inert component is 3 ~ 5 μm;
Organic carrier: 21 parts; The concrete pulp furnish of these 21 parts of organic carriers is (by mass percentage): turpentine oil 10%(that is 2.1 parts), phenmethylol 4.5%(that is 0.945 part), butyl 20%(that is 4.2 parts), butyl acetate 30%(that is 6.3 parts), tributyl citrate 30%(that is 6.3 parts), ethyl cellulose 5.5%(that is 1.155 parts);
Organic additive: 2.5 parts; These 2.5 portions of organic additives are Si Ban-85(2 parts) and the mixture of levelling agent (0.5 part).
Preparation method of the present invention specifically comprises the following steps:
1). prepared by inorganic bond
The raw material of inorganic bond is taken by formula ratio; Joined by raw material in V-type batch mixer and mix, incorporation time is 25min, and raw material is mixed; Join in platinum crucible by the raw material mixed, heat platinum crucible with high temperature furnace, make the mixed material temperature in platinum crucible be 1300 DEG C, temperature retention time is 30min; By the shrend of high temperature mixed material, obtain glass particle material; Glass particle material is dry; By the ball mill grinding of dried glass particle material, make its particle diameter < 10 μm; Obtain inorganic bond;
2). prepared by organic carrier
The raw material of organic carrier is taken by formula ratio; Mixed by raw material, joining in reactor after mixing and heat, make the material temperature in reactor be 80 DEG C, is under the condition of 60r/min at rotating speed, continues mixing 2h, makes the raw material in reactor fully dissolve mixing; Reactor stops heating, and the dissolving mixt in reactor is cooled, and chilling temperature is 30 DEG C, adopts 280 object stainless steel wires to consider net filtration, clarification; Obtain transparent organic carrier;
3). prepared by al powder mixt
The raw material of al powder mixt is taken by formula ratio; Raw material is mixed;
4). prepared by aluminium paste
Al powder mixt, inorganic bond, inert component, organic additive, organic carrier raw material is taken by formula ratio; Al powder mixt, inorganic bond and inert component are joined V-type to mix in powder machine and mix, incorporation time is 30min, makes them mix, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mix, incorporation time is 10min, makes them mix, obtains mixed slurry; Adopt three-roll grinder to be ground by slurry, control the fineness < 25 μm of slurry, the viscosity of slurry is 30 ~ 45pa.s;
5). vacuum froth breaking
Adopt vacuum Defoaming machine that slurry good for grinding distribution is carried out froth breaking; Obtain aluminium paste product.
The aluminium paste above-mentioned formula and method made is on probation on production line for manufacturing battery, monocrystalline 125 silicon chip, and printing weightening finish 0.9 ~ 1.1g, dries under the temperature conditions of 200 ~ 240 DEG C, sinters under sintering peak value is the condition of 830 DEG C; After sintering, aluminium film is silver gray, fine and close, without aluminium pill, aluminium bag, does not fall ash.Through cell slice test sorting, add up electrical performance of cell respectively, test sample 300, averages, and its Specifeca tion speeification is in table 1.
Comparative example 1
Except the inert component removed in embodiment 1 and by al powder mixt according to except the consumption blanking of 1.5wt%, other, by the formula in embodiment 1 and method, prepares and compare slurry; To compare the method for testing of slurry employing embodiment 1, its Specifeca tion speeification is in table 1.
The slurry serviceability contrast that table 1 embodiment 1 and comparative example 1 are made
Can clearly be found out by table 1: the slurry (embodiment 1) being added with inert component, its open circuit voltage, short circuit current, fill factor, curve factor and conversion efficiency and do not add inert component slurry (comparative example 1) without obviously distinguishing, but its warp value can well below the slurry not adding inert component.
Embodiment 2
Pulp furnish of the present invention is by following weight parts.
Al powder mixt: 73 parts; The concrete pulp furnish of these 73 parts of al powder mixts is (by mass percentage): the general spherical shape aluminium powder 35%(of particle diameter 1 ~ 3 μm that is 25.55 parts), the general spherical shape aluminium powder 50%(that is 36.5 parts of particle diameter 5 ~ 6 μm), the high pure spherical aluminium powder 15%(that is 10.95 parts of particle diameter 4 ~ 6 μm); Active aluminium content >=98% of described general spherical shape aluminium powder, active aluminium content >=99.8% of described high pure spherical aluminium powder;
Inorganic bond: 4 parts; The concrete pulp furnish of these 4 portions of inorganic bonds is (by mass percentage): bismuth oxide is 60%(that is 2.4 parts), zinc oxide 13%(that is 0.52 part), diboron trioxide 20%(that is 0.8 part), silicon dioxide 5%(that is 0.2 part), alundum (Al2O3) 2%(that is 0.08 part); The particle diameter of inorganic bond is < 10 μm;
Inert component: 0.8 part; Inert component is zinc oxide; The particle diameter of inert component is 3 ~ 5 μm;
Organic carrier: 21 parts; The concrete pulp furnish of these 21 parts of organic carriers is (by mass percentage): turpentine oil 5%(that is 1.05 parts), phenmethylol 7%(that is 1.47 parts), butyl 20%(that is 4.2 parts), butyl acetate 33%(that is 6.93 parts), tributyl citrate 28%(that is 5.88 parts), ethyl cellulose 7%(that is 1.47 parts);
Organic additive: 1.2 parts; These 1.2 portions of organic additives are mixtures of silane coupler (0.6 part) and lecithin (0.6 part).
Preparation method of the present invention specifically comprises the following steps:
1). prepared by inorganic bond
The raw material of inorganic bond is taken by formula ratio; Joined by raw material in V-type batch mixer and mix, incorporation time is 30min, and raw material is mixed; Join in platinum crucible by the raw material mixed, heat platinum crucible with high temperature furnace, make the mixed material temperature in platinum crucible be 1350 DEG C, insulation, temperature retention time is 32min; By the shrend of high temperature mixed material, obtain glass particle material; Glass particle material is dry; By the ball mill grinding of dried glass particle material, make its particle diameter < 10 μm; Obtain inorganic bond;
2). prepared by organic carrier
The raw material of organic carrier is taken by formula ratio; Mixed by raw material, joining in reactor after mixing and heat, make the material temperature in reactor be 90 DEG C, is under the condition of 65r/min at rotating speed, continues mixing 2.5h, makes the raw material in reactor fully dissolve mixing; Reactor stops heating, and the dissolving mixt in reactor is cooled, and chilling temperature is 25 DEG C, adopts 290 object stainless steel wires to consider net filtration, clarification; Obtain transparent organic carrier;
3). prepared by al powder mixt
The raw material of al powder mixt is taken by formula ratio; Raw material is mixed;
4). prepared by aluminium paste
Al powder mixt, inorganic bond, inert component, organic additive, organic carrier raw material is taken by formula ratio; Al powder mixt, inorganic bond and inert component are joined V-type to mix in powder machine and mix, incorporation time is 35min, makes them mix, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mix, incorporation time is 12min, makes them mix, obtains mixed slurry; Adopt three-roll grinder to be ground by slurry, control the fineness < 25 μm of slurry, the viscosity of slurry is 30 ~ 45pa.s;
5). vacuum froth breaking
Adopt vacuum Defoaming machine that slurry good for grinding distribution is carried out froth breaking; Obtain aluminium paste product.
The aluminium paste above-mentioned formula and method made is on probation on production line for manufacturing battery, monocrystalline 125 silicon chip, and printing weightening finish 0.8 ~ 1.0g, dries under the temperature conditions of 200 ~ 240 DEG C, sinters under sintering peak value is the condition of 830 DEG C; After sintering, aluminium film is silver gray, fine and close, without aluminium pill, aluminium bag, does not fall ash.Through cell slice test sorting, add up electrical performance of cell respectively, test sample 300, averages, and its Specifeca tion speeification is in table 2.
Comparative example 2
Except by the high-purity aluminium powder in embodiment 2 with etc. weight the displacement of particle diameter 4 ~ 6 μm of general spherical shape aluminium powders except, other prepares compare slurry by the formula in embodiment 2 and method; To compare the method for testing of slurry employing embodiment 2, its Specifeca tion speeification is in table 2.
The slurry serviceability contrast that table 2 embodiment 2 and comparative example 2 are made
Can clearly be found out by table 2: the slurry (embodiment 2) being added with high-purity aluminium powder, except fill factor, curve factor and warp value and the slurry (comparative example 2) of not increasing pure aluminium powder are without (warp value is a little more than the slurry not increasing pure aluminium powder) except obviously distinguishing, all the other performances are obviously better than the slurry not increasing pure aluminium powder.
Embodiment 3
Pulp furnish of the present invention is by following weight parts.
Al powder mixt: 62 parts; The concrete pulp furnish of these 62 parts of al powder mixts is (by mass percentage): the general spherical shape aluminium powder 15%(of particle diameter 1 ~ 3 μm that is 9.3 parts), the general spherical shape aluminium powder 70%(that is 43.4 parts of particle diameter 5 ~ 6 μm), the high pure spherical aluminium powder 15%(that is 9.3 parts of particle diameter 4 ~ 6 μm); Active aluminium content >=98% of described general spherical shape aluminium powder, active aluminium content >=99.8% of described high pure spherical aluminium powder;
Inorganic bond: 3 parts; The concrete pulp furnish of these 3 portions of inorganic bonds is (by mass percentage): bismuth oxide is 35%(that is 1.05 parts), zinc oxide 25%(that is 0.75 part), diboron trioxide 17%(that is 0.51 part), silica 1 5%(that is 0.45 part), alundum (Al2O3) 8%(that is 0.24 part); The particle diameter of inorganic bond is < 10 μm;
Inert component: 3 parts; These 3 parts of inert components are mixtures of silicon nitride (0.5 part), carborundum (0.5 part), zirconia (0.5 part), zinc oxide (0.5 part) and aluminium oxide (1 part); The particle diameter of inert component is 3 ~ 5 μm;
Organic carrier: 34 parts; The concrete pulp furnish of these 34 parts of organic carriers is (by mass percentage): turpentine oil 15%(that is 5.1 parts), phenmethylol 10%(that is 3.4 parts), butyl 12%(that is 4.08 parts), butyl acetate 39%(that is 13.26 parts), tributyl citrate 21%(that is 7.14 parts), ethyl cellulose 3%(that is 1.02 parts);
Organic additive: 4 parts; These 4 portions of organic additives are Si Ban-85(2 parts), the mixture of levelling agent (1 part) and Borate Ester as Coupling (1 part).
Preparation method of the present invention specifically comprises the following steps:
1). prepared by inorganic bond
The raw material of inorganic bond is taken by formula ratio; Joined by raw material in V-type batch mixer and mix, incorporation time is 30min, and raw material is mixed; Join in platinum crucible by the raw material mixed, heat platinum crucible with high temperature furnace, make the mixed material temperature in platinum crucible be 1400 DEG C, insulation, temperature retention time is 30min; By the shrend of high temperature mixed material, obtain glass particle material; Glass particle material is dry; By the ball mill grinding of dried glass particle material, make its particle diameter < 10 μm; Obtain inorganic bond;
2). prepared by organic carrier
The raw material of organic carrier is taken by formula ratio; Mixed by raw material, joining in reactor after mixing and heat, make the material temperature in reactor be 85 DEG C, is under the condition of 60r/min at rotating speed, continues mixing 2h, makes the raw material in reactor fully dissolve mixing; Reactor stops heating, and the dissolving mixt in reactor is cooled, and chilling temperature is 30 DEG C, adopts 260 object stainless steel wires to consider net filtration, clarification; Obtain transparent organic carrier;
3). prepared by al powder mixt
The raw material of al powder mixt is taken by formula ratio; Raw material is mixed;
4). prepared by aluminium paste
Al powder mixt, inorganic bond, inert component, organic additive, organic carrier raw material is taken by formula ratio; Al powder mixt, inorganic bond and inert component are joined V-type to mix in powder machine and mix, incorporation time is 40min, makes them mix, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mix, incorporation time is 15min, makes them mix, obtains mixed slurry; Adopt three-roll grinder to be ground by slurry, control the fineness < 25 μm of slurry, the viscosity of slurry is 30 ~ 45pa.s;
5). vacuum froth breaking
Adopt vacuum Defoaming machine that slurry good for grinding distribution is carried out froth breaking; Obtain aluminium paste product.
Embodiment 4
Pulp furnish of the present invention is by following weight parts.
Al powder mixt: 80 parts; The concrete pulp furnish of these 80 parts of al powder mixts is (by mass percentage): the general spherical shape aluminium powder 25%(of particle diameter 1 ~ 3 μm that is 20 parts), the general spherical shape aluminium powder 70%(that is 56 parts of particle diameter 5 ~ 6 μm), the high pure spherical aluminium powder 5%(that is 4 parts of particle diameter 4 ~ 6 μm); Active aluminium content >=98% of described general spherical shape aluminium powder, active aluminium content >=99.8% of described high pure spherical aluminium powder;
Inorganic bond: 2.5 parts; The concrete pulp furnish of these 2.5 portions of inorganic bonds is (by mass percentage): bismuth oxide is 45%(that is 1.125 parts), zinc oxide 18%(that is 0.45 part), diboron trioxide 20%(that is 0.5 part), silica 1 0%(that is 0.25 part), alundum (Al2O3) 7%(that is 0.175 part); The particle diameter of inorganic bond is < 10 μm;
Inert component: 0.3 part; Inert component is carborundum; The particle diameter of inert component is 3 ~ 5 μm;
Organic carrier: 15 parts; The concrete pulp furnish of these 15 parts of organic carriers is (by mass percentage): turpentine oil 13%(that is 1.95 parts), phenmethylol 8%(that is 1.2 parts), butyl 30%(that is 4.5 parts), butyl acetate 24%(that is 3.6 parts), tributyl citrate 19%(that is 2.85 parts), ethyl cellulose 6%(that is 0.9 part);
Organic additive: 0.6 part; Organic additive is Si Ban-85.
Preparation method of the present invention is identical with embodiment 1
Embodiment 5
Pulp furnish of the present invention is by following weight parts.
Al powder mixt: 68 parts; The concrete pulp furnish of these 68 parts of al powder mixts is (by mass percentage): the general spherical shape aluminium powder 40%(of particle diameter 1 ~ 3 μm that is 27.2 parts), the general spherical shape aluminium powder 45%(that is 30.6 parts of particle diameter 5 ~ 6 μm), the high pure spherical aluminium powder 15%(that is 10.2 parts of particle diameter 4 ~ 6 μm); Active aluminium content >=98% of described general spherical shape aluminium powder, active aluminium content >=99.8% of described high pure spherical aluminium powder;
Inorganic bond: 6 parts; The concrete pulp furnish of these 6 portions of inorganic bonds is (by mass percentage): bismuth oxide is 56%(that is 3.36 parts), zinc oxide 25%(that is 1.5 parts), diboron trioxide 7%(that is 0.42 part), silicon dioxide 8%(that is 0.48 part), alundum (Al2O3) 4%(that is 0.24 part); The particle diameter of inorganic bond is < 10 μm;
Inert component: 2.1 parts; These 2.1 parts of inert components are mixtures of silicon nitride (0.3 part), zirconia (0.3 part), zinc oxide (0.5 part) and aluminium oxide (1 part); The particle diameter of inert component is 3 ~ 5 μm;
Organic carrier: 28 parts; The concrete pulp furnish of these 28 parts of organic carriers is (by mass percentage): turpentine oil 9%(that is 2.52 parts), phenmethylol 10%(that is 2.8 parts), butyl 27%(that is 7.56 parts), butyl acetate 20%(that is 5.6 parts), tributyl citrate 30%(that is 8.4 parts), ethyl cellulose 4%(that is 1.12 parts);
Organic additive: 5 parts; These 5 portions of organic additives are Si Ban-85(1 parts), the mixture of lecithin (1 part), Borate Ester as Coupling (1 part), silane coupler (1 part) and levelling agent (1 part).
Preparation method of the present invention is identical with embodiment 1.
Claims (8)
1. a crystal silicon solar energy battery aluminium paste, is characterized in that, the pulp furnish of described aluminium paste is by following weight parts:
Al powder mixt 60 ~ 80 parts,
Inorganic bond 2 ~ 6 parts,
Inert component 0.1 ~ 3 part,
Organic carrier 15 ~ 35 parts,
Organic additive 0.5 ~ 5 part;
Described al powder mixt by active aluminium content < 99.8% and the high pure spherical aluminium powder of the general spherical shape aluminium powder of >=98% and active aluminium content >=99.8% form; Wherein, described general spherical shape aluminium powder is divided into two kinds according to the difference of particle diameter; The concrete pulp furnish of described al powder mixt is by following mass percent:
The general spherical shape aluminium powder 10 ~ 40% of particle diameter 1 ~ 3 μm,
The general spherical shape aluminium powder 40 ~ 70% of particle diameter 5 ~ 6 μm,
High pure spherical aluminium powder 3 ~ 20%;
The particle diameter of described inert component is 3 ~ 5 μm; Described inert component is the two or more mixture in aluminium oxide, carborundum, silicon nitride, zinc oxide, zirconia.
2. crystal silicon solar energy battery aluminium paste according to claim 1, it is characterized in that, the particle diameter of described high pure spherical aluminium powder is 4 ~ 6 μm.
3. crystal silicon solar energy battery aluminium paste according to claim 1, is characterized in that, the particle diameter < of described inorganic bond 10 μm; The concrete pulp furnish of described inorganic bond is by following mass percent:
Bismuth oxide 30 ~ 70%,
Zinc oxide 10 ~ 25%,
Diboron trioxide 5 ~ 20%,
Silicon dioxide 5 ~ 15%,
Alundum (Al2O3) 1 ~ 10%.
4. crystal silicon solar energy battery aluminium paste according to claim 1, is characterized in that, the pulp furnish of described organic carrier is by following mass percent:
Turpentine oil 5 ~ 15%,
Phenmethylol 3 ~ 10%,
Butyl 10 ~ 30%,
Butyl acetate 20 ~ 40%,
Tributyl citrate 15 ~ 30%,
Ethyl cellulose 2 ~ 7%.
5. crystal silicon solar energy battery aluminium paste according to claim 1, it is characterized in that, described organic additive is one or more the mixture in Si Ban-85, lecithin, Borate Ester as Coupling, silane coupler, levelling agent.
6. a preparation method for crystal silicon solar energy battery aluminium paste described in claim 1, specifically comprises the following steps:
1). prepared by inorganic bond
The raw material of inorganic bond is taken by formula ratio; Raw material is mixed; The raw material mixed is joined in platinum crucible, heats platinum crucible with high temperature furnace, make mixed material temperature >=1300 DEG C in platinum crucible, insulation, temperature retention time >=30min; By the shrend of high temperature mixed material, obtain glass particle material; Glass particle material is dry; By the ball mill grinding of dried glass particle material, make its particle diameter < 10 μm; Obtain inorganic bond;
2). prepared by organic carrier
The raw material of organic carrier is taken by formula ratio; Mixed by raw material, join in reactor after mixing and heat, make material temperature >=80 DEG C in reactor, under the condition of rotating speed >=60r/min, lasting mixing at least 2h, makes the raw material in reactor fully dissolve mixing; Reactor stops heating, the dissolving mixt in reactor is cooled, chilling temperature≤30 DEG C, adopts 260 ~ 300 object stainless steel wires to consider net filtration, clarification; Obtain transparent organic carrier;
3). prepared by al powder mixt
The raw material of al powder mixt is taken by formula ratio; Raw material is mixed;
4). prepared by aluminium paste
Al powder mixt, inorganic bond, inert component, organic additive, organic carrier raw material is taken by formula ratio; Al powder mixt, inorganic bond and inert component are mixed, obtains mixed powder; Mixed powder and organic carrier, organic additive are joined in homogenizer and mix, incorporation time >=10min, makes them mix, obtains mixed slurry; Adopt three-roll grinder to be ground by slurry, control the fineness < 25 μm of slurry, the viscosity of slurry is 30 ~ 45pa.s;
5). vacuum froth breaking
Adopt vacuum Defoaming machine that slurry good for grinding distribution is carried out froth breaking; Obtain aluminium paste product.
7. the preparation method of crystal silicon solar energy battery aluminium paste according to claim 6, it is characterized in that, the raw material in described inorganic bond preparation process mixes, and is to be joined in V-type batch mixer by raw material to mix, incorporation time >=20min.
8. the preparation method of crystal silicon solar energy battery aluminium paste according to claim 6, it is characterized in that, al powder mixt, inorganic bond and inert component in described aluminium paste preparation process mix, al powder mixt, inorganic bond and inert component are joined V-type to mix in powder machine and mix, incorporation time >=30min.
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| CN105469855B (en) * | 2014-09-01 | 2017-11-17 | 比亚迪股份有限公司 | A kind of crystal silicon solar energy battery aluminum conductive electric slurry and its preparation method and application |
| CN107689260A (en) * | 2016-08-04 | 2018-02-13 | 江苏正能电子科技有限公司 | One kind back of the body passivation solar cell aluminium paste |
| CN106098148A (en) * | 2016-08-26 | 2016-11-09 | 王泽陆 | A kind of solar cell conductive paste and preparation method thereof |
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