CN103226989B - Corrosivity carrier and preparation method, crystal silicon solar energy battery just/back silver electrocondution slurry and preparation method - Google Patents
Corrosivity carrier and preparation method, crystal silicon solar energy battery just/back silver electrocondution slurry and preparation method Download PDFInfo
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Abstract
The invention provides a kind of corrosivity carrier and preparation method thereof, this corrosivity carrier comprises corrosive agent, oxidant, thickener and solvent, wherein, with the gross mass of corrosivity carrier for benchmark, the content of corrosive agent is 1.0 ~ 10wt%, the content of oxidant is 0.2 ~ 8.0wt%, and the content of thickener is 5.0 ~ 15wt%, and the content of solvent is 75 ~ 95wt%.The present invention also provide a kind of crystal silicon solar energy battery containing this corrosivity carrier just/back silver electrocondution slurry and preparation method thereof.Crystal silicon solar energy battery provided by the invention just/back silver electrocondution slurry, obtained electrode more easily welds with photovoltaic welding belt, and weld strength is also high, and the solar cell series resistance obtained is little, and electricity conversion is also high.
Description
Technical field
The invention belongs to area of solar cell, particularly relate to a kind of corrosivity carrier and preparation method thereof, always crystal silicon solar energy battery just/back silver electrocondution slurry and preparation method.
Background technology
The current research about solar cell is very active; crystal silicon solar energy battery is PV(photovoltaic) leading products on market; and conductor paste is the main auxiliary material making crystal silicon solar energy battery, the electrocondution slurry that current market uses forms primarily of functional powder (metal powder), unorganic glass powder, organic carrier mixed rolling.Metal powder is as conductive phase, and glass dust makes solidifying film layer and matrix silicon strong bonded, plays connection, tension, fixing conductive phase particle in element sintering process.Organic carrier controls the rheological behavior of slurry, regulates the workability of slurry.
Except being formed except ohmic contact with matrix silicon after silver slurry (comprising front side silver paste and the back silver slurry) sintering of one of electrocondution slurry, its electrode formed or the output lead of battery, therefore the series resistance of electrode and welding performance evaluate two topmost performance parameters of silver slurry.In addition, front side silver paste is at phototropic face, affects the photoelectric conversion efficiency of cell piece largely.
Electrode electrical property on current market after many silver slurry sintering is substantially qualified, photoelectric conversion efficiency also can reach industry requirement, but the adhesive strength of electrode and silicon base and not high with the weld strength of welding, sometimes even form rosin joint, this connects into the use after assembly to battery and forms certain hidden danger.In addition, in order to reduce the material cost of silicon solar cell, the measure extensively taked at present is exactly the consumption as far as possible reducing cell piece conductive silver slurry.As the width reduction of front and back silver electrode, back silver electrode adopt subsection setup etc., these directly cause the contact area of electrode and silicon base and welding to reduce further, also have higher requirement to the adhesive force of conductive silver slurry and welding performance simultaneously.
Summary of the invention
The present invention solves crystal-silicon solar cell conductive silver slurry in prior art to sinter the dissatisfactory technical problem of welding performance of electrode and the photovoltaic welding belt obtained, there is provided a kind of corrosivity carrier and new crystal-silicon solar cell just/back silver electrocondution slurry, and corresponding preparation method.
The invention provides a kind of corrosivity carrier, comprise corrosive agent, oxidant, thickener and solvent, wherein, with the gross mass of corrosivity carrier for benchmark, the content of corrosive agent is 1.0 ~ 10wt%, the content of oxidant is 0.2 ~ 8.0wt%, and the content of thickener is 5.0 ~ 15wt%, and the content of solvent is 75 ~ 95wt%.
The invention provides a kind of preparation method of corrosivity carrier, comprise and corrosive agent, oxidant, thickener are dissolved in a solvent at 50 ~ 70 times.
The present invention also provides a kind of crystal silicon solar energy battery front conductive silver slurry, comprises silver powder, glass dust and corrosivity carrier, and wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
The present invention also provides a kind of crystal silicon solar battery back face conductive silver slurry, comprises silver powder and corrosivity carrier, and wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
Finally, the invention provides a kind of crystal silicon solar energy battery just/preparation method of back silver electrocondution slurry, comprise silver powder and corrosivity carrier, wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
The present inventor has surprisingly found a kind of corrosivity carrier, and this corrosivity carrier is used in crystal-silicon solar cell conductive silver slurry, can significantly improve the attachment of crystal-silicon solar cell conductive silver slurry and welding performance.Infer that its reason is: for crystal silicon solar energy battery front conductive silver slurry, because there is antireflective coating in front, so must glass dust be contained in the conductive silver slurry of front, when sintering, glass dust melting also passes silicon nitride anti-reflecting film, oxidant in corrosivity carrier silica simple substance under slurry baking temperature state forms silicon dioxide, corrosive agent calcium hydroxide or barium hydroxide etc. react rapidly with silicon dioxide, thus silicon base is corroded, back of the body silicon face is made to form tiny micropore, micro aluminum powder melting also diffuses into micropore, silver electrode layer and silicon form mechanical interlock, thus make silver and silicon substrate reach and firmly combine, improve front conductive silver slurry adhesion property.And for crystal silicon solar battery back face conductive silver slurry, because the back side is without silicon nitride anti-reflecting film, back silver electrocondution slurry can not contain glass dust, oxidant in corrosivity carrier and corrosive agent can directly corrode silicon, back of the body silicon face is made to form tiny micropore, micro aluminum powder melting also diffuses into micropore, silver electrode layer and silicon form mechanical interlock, thus make silver and silicon substrate reach and firmly combine, improving back silver electrocondution slurry adhesion property and also eliminating the technique of making glass dust.
Crystal silicon solar energy battery provided by the invention just/back silver electrocondution slurry in, due to the existence of corrosivity carrier, the relatively traditional front side silver paste material of glass dust in front conductive silver slurry composition decreases, back silver slurry can be free of glass dust, therefore, slurry after sintering, in remaining residue (i.e. silver electrode) composition, silver content is high, therefore, compared with starching with the common silver containing glass dust, electrode more easily welds with photovoltaic welding belt, and weld strength is also high, the solar cell series resistance obtained is little, and electricity conversion is also high.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of corrosivity carrier, comprise corrosive agent, oxidant, thickener and solvent, wherein, with the gross mass of corrosivity carrier for benchmark, the content of corrosive agent is 1.0 ~ 10wt%, the content of oxidant is 0.2 ~ 8.0wt%, and the content of thickener is 5.0 ~ 15wt%, and the content of solvent is 75 ~ 95wt%.
In corrosivity carrier provided by the invention, preferably, corrosive agent is one or more in lithium hydroxide, NaOH, calcium hydroxide or barium hydroxide; Preferred, corrosive agent is one or both in calcium hydroxide or barium hydroxide; More preferably NaOH.Preferably, oxidant is one or more in hydrogen peroxide, clorox, calcium hypochlorite, magnesium hypochlorite, barium hypochlorite, sodium chlorate, calcium chlorate, magron, barium chlorate; More preferably hydrogen peroxide, clorox or sodium chlorate, the source more horn of plenty of this oxidant, use cost is lower.
In corrosivity carrier provided by the invention, thickener can be oil thickeners or water-based thickener.Preferably, oil thickeners can be ethyl cellulose, propyl cellulose, butyl cellulose, alkyd resins, one or more in phenolic resins or phenol-formaldehyde resin modified; More preferably ethyl cellulose.Preferably, water-based thickener can be one or more in sodium carboxymethylcellulose (CMC), polyvinyl alcohol (PVA), hydroxypropyl methylcellulose, hydroxyethylcellulose, polyethylene glycol, water soluble polyurethane resin, starch derivatives or PVP; More preferably sodium carboxymethylcellulose or polyvinyl alcohol.The preferred oiliness of the present invention or water-based thickener cost lower, and adhesive effect is better.
In corrosivity carrier provided by the invention, solvent is organic solvent or water; Preferably, organic solvent comprises the first organic solvent and the second organic solvent; Wherein, the first organic solvent is made up of one or both in methyl alcohol or ethanol; Second organic solvent is made up of one or more in dibutyl phthalate (DBP), butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate or tributyl phosphate; Preferred further, solvent is deionized water, more friendly to environment as the slurry that the corrosivity carrier of solvent is obtained with deionized water.
The invention provides a kind of preparation method of corrosivity carrier, comprise by corrosive agent, oxidant, thickener in dissolving in deionized water, make it dissolve at 50 ~ 70 DEG C and stir, obtaining the corrosivity carrier solution of uniform component.
The invention provides a kind of crystal silicon solar energy battery front conductive silver slurry, comprise silver powder, glass dust and corrosivity carrier, wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
In the conductive silver slurry of crystal silicon solar energy battery front provided by the invention, preferably, with the gross mass of described crystal silicon solar energy battery front conductive silver slurry for benchmark, the content of described silver powder is 80 ~ 90wt%, the content of described glass dust is 1.0 ~ 3.0wt%, and the content of described corrosivity carrier is 10 ~ 20wt%.
The present invention also provides a kind of crystal silicon solar energy battery front conductive silver slurry, comprises silver powder, glass dust and corrosivity carrier, and wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
The present invention also provides a kind of crystal silicon solar battery back face conductive silver slurry, comprises silver powder and corrosivity carrier, and wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
Glass dust can also be comprised in the conductive silver slurry of crystal silicon solar battery back face provided by the invention, with the gross mass of described crystal silicon solar battery back face conductive silver slurry for benchmark, the content of described silver powder is 50 ~ 80wt%, the content of described glass dust is 0 ~ 3.0wt%, and the content of described corrosivity carrier is 20 ~ 50wt%.
Crystal silicon solar energy battery provided by the invention just/back silver electrocondution slurry in, preferably, described silver powder laser particle size D
50for 0.1-3.0 μm, be conducive to silver paste forms dense uniform silver electrode layer when sintering; Preferably, described silver powder specific area>=0.8m
2/ g, is conducive to the sintering activity improving silver powder, forms fine and close alloy-layer after silver slurry sintering; Preferably, described silver powder tap density>=3.5g/cm
3, be conducive to the silver content reducing silver slurry, thus reduce the working viscosity of slurry.
Finally, the invention provides a kind of crystal silicon solar energy battery just/preparation method of back silver electrocondution slurry, comprise silver powder and corrosivity carrier, wherein, described corrosivity carrier is corrosivity carrier provided by the present invention.
Crystal silicon solar energy battery provided by the invention just/preparation method of back silver electrocondution slurry, its concrete preparation technology can be: silver powder, glass dust are mixed in corrosivity carrier, stir, then be ground to certain fineness with three-roll grinder; Preferably, the fineness of front side silver paste controls at 5 ~ 8 microns; The silver slurry fineness at the back side controls at 8 ~ 15 microns.
Preparation method provided by the present invention specifically can be described as.
1, the preparation of corrosivity carrier
Composition: 1.0 ~ 8.0wt% corrosive agent, the oxidant of 0.5 ~ 5.0wt%, the thickener of 5.0 ~ 15wt%, the deionized water of 75 ~ 95wt% or mixed solvent;
Preparation method: above-mentioned corrosive agent, oxidant, thickener are dissolved in mixed solvent or deionized water, make it dissolve at 50 ~ 70 DEG C and stir, obtain the corrosivity carrier solution of uniform component.
2, the preparation method of crystal silicon solar energy battery front conductive silver slurry
Composition: the silver powder of 80 ~ 90wt%, the glass dust of 1.0 ~ 3.0wt%, the corrosivity carrier of 10 ~ 20wt%;
Preparation method: weigh by above-mentioned formula and mix, being ground to fineness through three-roll grinder device is 5.0 ~ 8.0 microns, and viscosity is 110 ~ 150Pas(NDJ-79 type viscosimeter, 75 revs/min, 25 DEG C), obtain front conductive silver slurry.
3, the preparation method of crystal silicon solar battery back face conductive silver slurry
Composition: the micro aluminum powder of 50 ~ 80wt%, the glass dust of 0 ~ 3.0wt%, the corrosivity carrier of 20 ~ 50wt%;
Preparation method: weigh by above-mentioned formula and mix, being ground to fineness through three-roll grinder device is 8.0 ~ 15.0 microns, and viscosity is 70 ~ 100Pas(NDJ-79 type viscosimeter, 75 revs/min, 25 DEG C), obtain back silver electrocondution slurry.
Crystal silicon solar energy battery provided by the present invention just/back of the body conductive silver slurry silk screen printing in crystal silicon solar energy battery just/back side on, dry and the smooth densification of metallic diaphragm obtained after sintering, outward appearance is good, weld strength after the electrode layer formed welds with photovoltaic welding belt is also high, the solar cell series connection resistance obtained is little, and electricity conversion is also high.
Below will the present invention is described further by embodiment.
Embodiment 1
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step one: the preparation of glass dust
Consist of: the Bi of 79wt%
2o
3, the B of 10wt%
2o
3, the SiO of 5.0wt%
2, the Al of 3.0wt%
2o
3, the ZnO of 3wt%
Preparation method: adopt V-Mixer that above mixing of materials is even, load in porcelain crucible, put into silicon carbide rod furnace, intensification is preheating to 550 DEG C, insulation 0.5h, then rises to 1250 DEG C, melting 1.5h, shrend is filtered, and will obtain glass dregs and load ball grinder, Mass Control ratio, zirconia ball: bead: deionized water=4:1:0.7, tank speed 300 revs/min, ball milling 6.5 hours, filter, dry, obtain middle particle diameter D
50be the glass dust of 0.8 μm.
Step 2: the configuration of corrosivity carrier
Consist of: the NaOH of 5wt%, the clorox of 3wt%, 8wt% sodium carboxymethylcellulose, the deionized water of 84wt%;
Preparation method: above-mentioned corrosive agent, oxidant, thickener are dissolved in deionized water, makes it dissolve at 60 DEG C and stir, obtaining the corrosivity carrier solution of uniform component.
Step 3: the preparation of front conductive silver slurry
Consist of: account for particle diameter D in total amount 85wt%
50be the ball shape silver powder of 0.65 μm, 2.5wt% glass dust, 12.5wt% corrosivity carrier solution;
Above component is mixed, and grinds 20 times, make its fineness be 6 μm, front conductive silver slurry finished product, testing its viscosity is 130.5Pas.
Embodiment 2
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step one: the preparation of glass dust
Identical with embodiment 1.
Step 2: the configuration of corrosivity carrier
Consist of: the calcium hydroxide of 9wt%, the calcium hypochlorite of 7wt%, 8wt% sodium carboxymethylcellulose, the deionized water of 76wt%, technique is identical with embodiment 1.
Step 3: the preparation of front conductive silver slurry
Identical with embodiment 1, obtain front conductive silver slurry finished product, testing its viscosity is 136.8Pas.
Embodiment 3
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step one: the preparation of glass dust
Identical with embodiment 1.
Step 2: the configuration of corrosivity carrier
Consist of: 5.0wt% NaOH, 3.0wt% hydrogen peroxide, 8wt% ethyl cellulose STD-10 (it is 10 that Tao Shi produces viscosity), the mixed solvent of 84wt%, mixed solvent adopts ethanol: tributyl citrate: butyl carbitol acetate=70:20:10.
Step 3: the preparation of front conductive silver slurry
Identical with embodiment 1, obtain front conductive silver slurry finished product, testing its viscosity is 145.8Pas.
Embodiment 4
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step one: the preparation of glass dust
Identical with embodiment 1.
Step 2: the configuration of corrosivity carrier
Consist of: 1.0wt% NaOH, 0.2wt% hydrogen peroxide, 8wt% ethyl cellulose STD-10 (it is 10 that Tao Shi produces viscosity), the mixed solvent of 90.8wt%, mixed solvent adopts ethanol: tributyl citrate: butyl carbitol acetate=70:20:10.
Step 3: the preparation of front conductive silver slurry
Identical with embodiment 1, obtain front conductive silver slurry finished product, testing its viscosity is 148.4Pas.
Embodiment 5
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the configuration of corrosivity carrier
Consist of: the NaOH of 5wt%, the clorox of 3wt%, 5wt% sodium carboxymethylcellulose, the deionized water of 87wt%;
Preparation method: above-mentioned corrosive agent, oxidant, thickener are dissolved in deionized water, makes it dissolve at 50 ~ 70 DEG C and stir, obtaining the corrosivity carrier solution of uniform component.
Step 2: the preparation of back silver electrocondution slurry
Consist of: account for particle diameter D in total amount 64wt%
50be the ball shape silver powder of 1.25 μm, the corrosivity carrier solution of 36wt%;
Above component mixed, and grind 16 times, make its fineness be 10 μm, obtain back silver electrocondution slurry finished product, testing its viscosity is 72.8Pas.
Embodiment 6
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the configuration of corrosivity carrier
Consist of: the calcium hydroxide of 10wt%, the calcium chlorate of 8wt%, 6wt% sodium carboxymethylcellulose, the deionized water of 76wt%.
Step 2: the preparation of back silver electrocondution slurry
Identical with embodiment 5, obtain back silver electrocondution slurry finished product, testing its viscosity is 78.6Pas.
Embodiment 7
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the preparation of glass dust
Get the Bi of 68wt%
2o
3, the B of 20wt%
2o
3, the SiO of 6.0wt%
2, the ZnO of 6.0wt%, adopts V-Mixer to mix, load in porcelain crucible, put into silicon carbide rod furnace, heat up and be preheating to 550 DEG C, insulation 0.5h, then rise to 1250 DEG C, melting 0.5h, shrend is filtered, and will obtain glass dregs and load ball grinder, Mass Control ratio, zirconia ball: bead: deionized water=2:1:0.5, tank speed 100 revs/min, ball milling 72 hours, filter, dry, obtain middle particle diameter D
50be the glass dust of 1.5 μm.
Step 2: the configuration of corrosivity carrier
Identical with embodiment 5.
Step 3: the preparation of back silver electrocondution slurry
Consist of: account for particle diameter D in total amount 60wt%
50be the ball shape silver powder of 1.25 μm, the glass dust that 4wt% step one obtains, the corrosivity carrier solution that 36wt% step 2 obtains;
Above component mixed, and grind 16 times, make its fineness be 10 μm, obtain back silver electrocondution slurry finished product, testing its viscosity is 84.3Pas.
Embodiment 8
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the configuration of corrosivity carrier
Consist of: 3.0wt% NaOH, 1.0wt% hydrogen peroxide, 10wt% ethyl cellulose STD-100 (it is 100 that Tao Shi produces viscosity), the mixed solvent of 86wt%, mixed solvent adopts ethanol: tributyl citrate: butyl carbitol acetate=70:20:10.
Step 2: the preparation of back silver electrocondution slurry
Identical with embodiment 5, obtain back silver electrocondution slurry finished product, testing its viscosity is 88.6Pas.
Embodiment 9
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the bearer configuration of corrosivity carrier
Consist of: 1.0wt% NaOH, 0.2wt% hydrogen peroxide, 10wt% ethyl cellulose STD-100 (it is 100 that Tao Shi produces viscosity), the mixed solvent of 88.8wt%, mixed solvent adopts ethanol: tributyl citrate: butyl carbitol acetate=70:20:10.
Step 2: the preparation of back silver electrocondution slurry
Identical with embodiment 5, obtain back silver electrocondution slurry finished product, testing its viscosity is 67.3Pas.
Embodiment 10
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the configuration of glass dust
Identical with embodiment 7.
Step 2: the configuration of corrosivity carrier
Identical with embodiment 5.
Step 3: the preparation of back silver electrocondution slurry
Identical with embodiment 7, obtain back silver electrocondution slurry finished product, testing its viscosity is 95.6Pas.
Comparative example 1
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step one: the preparation of glass dust
With embodiment 1.
Step 2: the configuration of organic carrier
Consist of: 6wt% ethyl cellulose STD-100 (it is 100 that Tao Shi produces viscosity), 3.0wt% hexadecanol, the Tissuemat E of 3.0wt%, the mixed solvent of 88wt%, mixed solvent adopts butyl carbitol: dibutyl phthalate (DBP): butyl carbitol acetate=60:30:10.
Step 3: prepared by front conductive silver slurry
Consist of: particle diameter D in 85wt%
50be the ball shape silver powder of 0.65 μm, the glass dust that 2.5wt% is obtained by step one, the organic carrier that 12.5wt% is obtained by step 2;
Above component mixed, and grind 20 times, make its fineness be 6 μm, obtain front conductive silver slurry finished product, testing its viscosity is 125.8Pas.
Comparative example 2
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step one: the preparation of glass dust
With embodiment 7.
Step 2: the configuration of organic carrier
Organic carrier consists of: 10wt% ethyl cellulose STD-100 (it is 100 that Tao Shi produces viscosity), and 5.0wt% hexadecanol, the mixed solvent of 85wt%, mixed solvent adopts butyl carbitol: terpinol: butyl carbitol acetate=50:40:10.
Step 3: prepared by back silver electrocondution slurry
Consist of: account for particle diameter D in total amount 60wt%
50be the ball shape silver powder of 1.25 μm, the glass dust that 4.0wt% is obtained by step one, the organic carrier that 36wt% is obtained by step 2;
Above component is mixed, and grinds 16 times, make its fineness be 10 μm, back silver electrocondution slurry finished product, testing its viscosity is 76.2Pas.
By technique below, the slurry that embodiment and comparative example make is made into solar cell.
The electrocondution slurry of above-mentioned gained is tried out at production line, polysilicon chip specification: 156 × 156mm, thickness is 200 μm (before corrosion), before printing, thickness is 180 μm, first printed back silver paste, adopts subsection setup, number to be printed is about 30mg/ sheet, dry, republish back field aluminum paste material, dry, bake out temperature is 150 DEG C, drying time is 5 minutes, republishes front side silver paste material, then crosses continuous tunnel furnace and dries sintering, the whole time is about 2 minutes, sintering peak temperature is 900 ± 10 DEG C, and the time is about 2 seconds, the properties of test battery sheet after coming out of the stove.When testing the performance of certain electrocondution slurry of the present invention, supporting with it, back field aluminum paste adopts the large standing grain 108C trade mark, and front side silver paste adopts the Du Pont 16C trade mark, and back silver slurry adopts the Du Pont PV505 trade mark.
performance test.
1, surface appearance: whether have sand holes, pin hole or other bad phenomenon with the back electrode surface that 10 times of magnifying glasses are observed on solar cell.
2, electrode sheet resistance: the square resistance of the sheet resistance tester test silver electrode film adopting crystalline silicon solar cell piece special, unit is m Ω/.
3, cell series resistance: adopt solar cell piece special test equipment to test.Unit m Ω.
4, weld strength: select victory footpath between fields, Shanghai 2*0.2mm tin lead welding band, soaks post-drying with Henkel X32-10I type scaling powder, then carries out manual welding at 330 DEG C to the back electrode sintered.After cell piece cools naturally, use mountain degree SH-100 pull and push dynamometer to carry out tensile test along 45 ° of directions to back electrode, survey its Average peel force, unit is N.
5, electricity conversion: the electricity conversion solar cell piece special test equipment of cell piece, as single flash operation simulator is tested.Test condition is standard test condition (STC): light intensity: 1000W/m
2; Spectrum: AM1.5; Temperature: 25 DEG C.Method of testing is carried out according to IEC904-1.
By the cell piece that the slurry that embodiment and comparative example obtain obtains, get 200 cell pieces respectively, the mean value of test acquired results is listed in table 1.
Table 1
| Numbering | Electrode sheet resistance (m Ω/) | Series resistance (m Ω) | Weld strength (N) | Electricity conversion (%) |
| Embodiment 1 | 1.23 | 2.630 | 9.21 | 17. 38 |
| Embodiment 2 | 1.35 | 2.674 | 7.12 | 17.27 |
| Embodiment 3 | 1.27 | 2.612 | 6.35 | 17. 31 |
| Embodiment 4 | 1.98 | 2.734 | 5.78 | 17. 24 |
| Embodiment 5 | 1.34 | 2.670 | 8.32 | 17.28 |
| Embodiment 6 | 1.86 | 2.690 | 8.56 | 17. 25 |
| Embodiment 7 | 1.31 | 2.630 | 9.59 | 17. 32 |
| Embodiment 8 | 1.24 | 2.610 | 8.56 | 17.35 |
| Embodiment 9 | 2.04 | 2.698 | 5.85 | 17. 20 |
| Embodiment 10 | 1.28 | 2.632 | 9.45 | 17. 36 |
| Comparative example 1 | 3.23 | 3.052 | 4.27 | 17.15 |
| Comparative example 2 | 3.35 | 3.252 | 3.87 | 17.12 |
The back electrode surface observing the solar battery sheet of various embodiments of the present invention with 10 times of magnifying glasses can find, all smooth densification of electrode surface of the solar battery sheet adopting slurry provided by the present invention to obtain, without hole, outward appearance is good.Simultaneously, the test result of embodiment 1-10 and comparative example 1-2 as can be seen from table 1, the series resistance of the solar cell obtained after adopting the sintering of obtained conductive silver slurry of the present invention is little, the sheet resistance of electrode is also little, weld strength after welding with photovoltaic welding belt is higher, and the electricity conversion of battery also significantly improves.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a corrosivity carrier, comprises corrosive agent, oxidant, thickener and solvent, it is characterized in that, described corrosive agent is one or more in lithium hydroxide, NaOH, calcium hydroxide or barium hydroxide; Described oxidant is one or more in hydrogen peroxide, clorox, calcium hypochlorite, magnesium hypochlorite, barium hypochlorite, sodium chlorate, calcium chlorate, magron, barium chlorate; With the gross mass of described corrosivity carrier for benchmark, the content of described corrosive agent is 1.0 ~ 10wt%, and the content of described oxidant is 0.2 ~ 8.0wt%, and the content of described thickener is 5.0 ~ 15wt%, and the content of described solvent is 75 ~ 95wt%.
2. corrosivity carrier as claimed in claim 1, it is characterized in that, described thickener is oil thickeners, and described oil thickeners is ethyl cellulose, propyl cellulose, butyl cellulose, alkyd resins, one or more in phenolic resins or phenol-formaldehyde resin modified.
3. corrosivity carrier as claimed in claim 2, it is characterized in that, described oil thickeners is ethyl cellulose.
4. corrosivity carrier as claimed in claim 1, it is characterized in that, described thickener is water-based thickener, and described water-based thickener is one or more in sodium carboxymethylcellulose, polyvinyl alcohol, hydroxypropyl methylcellulose, hydroxyethylcellulose, polyethylene glycol, water soluble polyurethane resin, starch derivatives or PVP.
5. corrosivity carrier as claimed in claim 4, it is characterized in that, described water-based thickener is sodium carboxymethylcellulose or polyvinyl alcohol.
6. corrosivity carrier as claimed in claim 1, it is characterized in that, described solvent is organic solvent or water.
7. corrosivity carrier as claimed in claim 6, it is characterized in that, described organic solvent comprises the first organic solvent and the second organic solvent; Described first organic solvent is one or both in methyl alcohol or ethanol; Described second organic solvent is one or more in dibutyl phthalate, butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate or tributyl phosphate.
8. corrosivity carrier as claimed in claim 6, it is characterized in that, described water is deionized water.
9., as a preparation method for corrosivity carrier as described in any one in claim 1-8, comprise and corrosive agent, oxidant, thickener are dissolved in a solvent at 50 ~ 70 DEG C.
10. a crystal silicon solar energy battery front conductive silver slurry, comprises silver powder, glass dust and corrosivity carrier, it is characterized in that, described corrosivity carrier is the corrosivity carrier in claim 1-8 described in any one.
11. crystal silicon solar energy battery front as claimed in claim 10 conductive silver slurries, it is characterized in that, with the gross mass of described crystal silicon solar energy battery front conductive silver slurry for benchmark, the content of described silver powder is 80 ~ 90wt%, the content of described glass dust is 1.0 ~ 3.0wt%, and the content of described corrosivity carrier is 10 ~ 20wt%.
12. 1 kinds of crystal silicon solar energy battery front conductive silver slurry preparation methods, comprise silver powder, glass dust and corrosivity carrier mixed grinding, obtain the crystal silicon solar energy battery front conductive silver slurry described in claim 10 or 11.
13. 1 kinds of crystal silicon solar battery back face conductive silver slurries, comprise silver powder and corrosivity carrier, it is characterized in that, described corrosivity carrier is the corrosivity carrier in claim 1-8 described in any one.
14. crystal silicon solar battery back face as claimed in claim 13 conductive silver slurries, is characterized in that, described crystal silicon solar battery back face conductive silver slurry also comprises glass dust.
15. crystal silicon solar battery back face as claimed in claim 14 conductive silver slurries, it is characterized in that, with the gross mass of described crystal silicon solar battery back face conductive silver slurry for benchmark, the content of described silver powder is 50 ~ 80wt%, the content of described glass dust is 0 ~ 3.0wt%, and the content of described corrosivity carrier is 20 ~ 50wt%.
16. 1 kinds of crystal silicon solar battery back face conductive silver slurry preparation methods, comprise silver powder and corrosivity carrier mixed grinding, obtain the crystal silicon solar battery back face conductive silver slurry in claim 13-15 described in any one.
Priority Applications (1)
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| CN104157332A (en) * | 2014-08-29 | 2014-11-19 | 天津市职业大学 | Silicon solar cell front face electrode lead-free silver paste and preparing method thereof |
| CN104392770A (en) * | 2014-10-31 | 2015-03-04 | 湖南红太阳光电科技有限公司 | Crystalline silicon solar cell low-warpage back surface aluminum paste |
| CN108362199A (en) * | 2017-01-26 | 2018-08-03 | 华邦电子股份有限公司 | Straining and sensing device and its manufacturing method |
| CN109520917A (en) * | 2018-12-30 | 2019-03-26 | 苏州阿特斯阳光电力科技有限公司 | The corrosion resistance test method of cell piece slurry |
| CN114946039A (en) * | 2020-02-14 | 2022-08-26 | 硕禾电子材料股份有限公司 | Conductive paste for heterojunction solar cell, heterojunction solar cell and electrode structure |
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