CN103226989A - Corrosive carrier, preparation method thereof, crystalline silicon solar battery front/back side silver conductive paste and preparation method thereof - Google Patents
Corrosive carrier, preparation method thereof, crystalline silicon solar battery front/back side silver conductive paste and preparation method thereof Download PDFInfo
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Abstract
The invention provides a corrosive carrier and a preparation method thereof. Based on the total mass, the corrosive carrier comprises the following components: 1.0-10wt% of corrosive agent, 0.2-8.0wt% oxidant, 5.0-15wt% of thickening agent and 75-95wt% of solvent. The invention further provides a crystalline silicon solar battery front/back side silver conductive paste containing the corrosive carrier. An electrode made from the crystalline silicon solar battery front/back side silver conductive paste can be welded with a photovoltaic welding strip more easily and has higher welding strength; and an obtained solar battery has small series resistance and high photoelectric converting efficiency.
Description
Technical field
The invention belongs to area of solar cell, relate in particular 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
Current research about solar cell is very active; crystal silicon solar energy battery is the PV(photovoltaic) leading products on the market; and conductor paste is main auxiliary material of making crystal silicon solar energy battery, and the electrocondution slurry that use in present market is mainly formed by functional powder (metal powder), unorganic glass powder, organic carrier mixed rolling.Metal powder is as conductive phase, and glass dust is to make solidifying film layer and matrix silicon strong bonded, plays a part to connect in the element sintering process, tension, fixing conductive phase particle.The rheological behavior of organic carrier control slurry, the workability of regulating slurry.
Behind the silver of one of electrocondution slurry slurry (comprising front side silver paste and back silver slurry) sintering except that forming the ohmic contact with matrix silicon, the electrode of its formation still is the output lead of battery, so the series resistance of electrode and welding performance are to estimate two topmost performance parameters of silver slurry.In addition, front side silver paste is at phototropic face, affects the photoelectric conversion efficiency of battery sheet largely.
Electrode electrical property on the present market behind many silver slurry sintering is qualified substantially, 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 forms certain hidden danger to the use that battery connects into behind the assembly.In addition, in order to reduce the material cost of silicon solar cell, a measure of extensively taking at present is exactly the consumption that as far as possible reduces battery sheet conductive silver slurry.Width reduction, back silver electrode as front and back silver electrode adopt segmentation to be provided with or the like, these directly cause the contact area of electrode and silicon base and welding further to reduce, and also the adhesive force and the welding performance of conductive silver slurry are had higher requirement simultaneously.
Summary of the invention
The present invention is for solving crystal-silicon solar cell conductive silver slurry sintering obtains in the prior art the electrode and the dissatisfactory technical problem of welding performance of photovoltaic welding belt, provide a kind of corrosivity carrier and new crystal-silicon solar cell just/the back silver electrocondution slurry, and corresponding preparation method.
The invention provides a kind of corrosivity carrier, comprise corrosive agent, oxidant, thickener and solvent, wherein, gross mass with the corrosivity carrier is a 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 corrosive agent, oxidant, thickener are dissolved in the 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 a 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 a corrosivity carrier provided by the present invention.
At last, 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 a corrosivity carrier provided by the present invention.
The present inventor's accident has been found a kind of corrosivity carrier, and this corrosivity carrier is used in the crystal-silicon solar cell conductive silver slurry, can obviously improve the crystal-silicon solar cell conductive silver slurry and adhere to and welding performance.Infer its former because: for crystal silicon solar energy battery front conductive silver slurry, because there is antireflective coating in the front, so must contain glass dust in the conductive silver slurry of front, when sintering, the glass dust fusion is also passed the silicon nitride antireflective coating, 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, thereby silicon base is corroded, make back of the body silicon face form tiny micropore, the micro aluminum powder fusion also diffuses into micropore, silver electrode layer and silicon form mechanical interlock, thereby make silver and silicon substrate reach firm combination, improved front conductive silver slurry adhesion property.And for crystal silicon solar battery back face conductive silver slurry, because the back side does not have the silicon nitride antireflective coating, the back silver electrocondution slurry can not contain glass dust, oxidant in the corrosivity carrier and corrosive agent can directly corrode silicon, make back of the body silicon face form tiny micropore, the micro aluminum powder fusion also diffuses into micropore, silver electrode layer and silicon form mechanical interlock, thereby make silver and silicon substrate reach firm combination, improving the technology that back silver electrocondution slurry adhesion property has also saved making glass dust.
Crystal silicon solar energy battery provided by the invention just/the back silver electrocondution slurry in, because the existence of corrosivity carrier, the traditional relatively front side silver paste material of glass dust in the front conductive silver slurry is formed decreases, the back silver slurry can not contain glass dust, therefore, slurry is behind sintering, silver content height during remaining residue (being silver electrode) is formed, therefore, compare with the common silver slurry that contains glass dust, electrode is easier to be welded with photovoltaic welding belt, and weld strength is also high, the solar cell series resistance that obtains is little, and electricity conversion is also high.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The invention provides a kind of corrosivity carrier, comprise corrosive agent, oxidant, thickener and solvent, wherein, gross mass with the corrosivity carrier is a 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 the corrosivity carrier provided by the invention, preferred, corrosive agent is one or more in lithium hydroxide, NaOH, calcium hydroxide or the barium hydroxide; Preferred, corrosive agent is one or both in calcium hydroxide or the barium hydroxide; NaOH more preferably.Preferably, oxidant is one or more in hydrogen peroxide, clorox, calcium hypochlorite, magnesium hypochlorite, barium hypochlorite, sodium chlorate, calcium chlorate, magron, the barium chlorate; More preferably hydrogen peroxide, clorox or sodium chlorate, the source of this oxidant is horn of plenty more, and use cost is lower.
In the corrosivity carrier provided by the invention, thickener can be oiliness thickener or water-based thickener.Preferably, the oiliness thickener can be ethyl cellulose, propyl cellulose, butyl cellulose, alkyd resins, one or more in phenolic resins or the phenol-formaldehyde resin modified; Ethyl cellulose more preferably.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 the PVP; More preferably sodium carboxymethylcellulose or polyvinyl alcohol.Preferred oiliness of the present invention or water-based thickener cost are lower, and adhesive effect is better.
In the corrosivity carrier provided by the invention, solvent is organic solvent or water; Preferably, organic solvent comprises first organic solvent and second organic solvent; Wherein, first organic solvent is made up of in methyl alcohol or the ethanol one or both; Second organic solvent is made up of in dibutyl phthalate (DBP), butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate or the tributyl phosphate one or more; Further preferred, solvent is a deionized water, and is more friendly to environment as the slurry that the corrosivity carrier of solvent makes with deionized water.
The invention provides a kind of preparation method of corrosivity carrier, comprise corrosive agent, oxidant, thickener in being dissolved in deionized water, make its dissolving and stir, obtain the corrosivity carrier solution of uniform component at 50 ~ 70 ℃.
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 a corrosivity carrier provided by the present invention.
In the conductive silver slurry of crystal silicon solar energy battery provided by the invention front, preferably, gross mass with described crystal silicon solar energy battery front conductive silver slurry is a 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 ~ 20 wt%.
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 a 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 a corrosivity carrier provided by the present invention.
Can also comprise glass dust in the crystal silicon solar battery back face conductive silver slurry provided by the invention, gross mass with described crystal silicon solar battery back face conductive silver slurry is a 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 ~ 50 wt%.
Crystal silicon solar energy battery provided by the invention just/the back silver electrocondution slurry in, preferably, described silver powder laser particle size D
50Be 0.1-3.0 μ m, help silver paste and when sintering, form fine and close silver electrode layer uniformly; Preferably, described silver powder specific area 〉=0.8m
2/ g helps improving the sintering activity of silver powder, forms fine and close alloy-layer behind the silver slurry sintering; Preferably, described silver powder tap density 〉=3.5g/cm
3, help reducing the silver content of silver slurry, thereby reduce the working viscosity of slurry.
At last, 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 a 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 the corrosivity carrier, stir, be ground to certain fineness with three-roll grinder again; Preferably, the fineness of front side silver paste is controlled at 5 ~ 8 microns; The silver slurry fineness at the back side is controlled at 8 ~ 15 microns.
Preparation method provided by the present invention specifically can be described as.
1, the preparation of corrosivity carrier
Form: 1.0 ~ 8.0wt% corrosive agent, the oxidant of 0.5 ~ 5.0 wt%, 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 the deionized water, make its dissolving and stir, obtain the corrosivity carrier solution of uniform component at 50 ~ 70 ℃.
2, the preparation method of crystal silicon solar energy battery front conductive silver slurry
Form: the silver powder of 80 ~ 90wt%, the glass dust of 1.0 ~ 3.0wt%, the corrosivity carrier of 10 ~ 20wt%;
The preparation method: by above-mentioned prescription weighing and mix, being ground to fineness through the three-roll grinder device is 5.0 ~ 8.0 microns, and viscosity is 110 ~ 150 Pas(NDJ-79 type viscosimeters, 75 rev/mins, and 25 ℃), obtain the front conductive silver slurry.
3, the preparation method of crystal silicon solar battery back face conductive silver slurry
Form: the micro aluminum powder of 50 ~ 80wt%, the glass dust of 0 ~ 3.0wt%, the corrosivity carrier of 20 ~ 50wt%;
The preparation method: by above-mentioned prescription weighing and mix, being ground to fineness through the three-roll grinder device is 8.0 ~ 15.0 microns, and viscosity is 70 ~ 100 Pas(NDJ-79 type viscosimeters, 75 rev/mins, and 25 ℃), obtain the 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, the smooth densification of metallic diaphragm that obtains behind oven dry and the sintering, outward appearance is good, weld strength after electrode layer that forms and the photovoltaic welding belt welding is also high, the solar cell series connection resistance that obtains 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 1: 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, in the porcelain crucible of packing into, put into silicon carbide rod furnace, intensification is preheating to 550 ℃, and insulation 0.5h rises to 1250 ℃ again, melting 1.5h, shrend is filtered, and will obtain the glass slag ball grinder of packing into, the control of quality ratio, zirconia ball: bead: deionized water=4:1:0.7,300 rev/mins of jar speed, ball milling 6.5 hours, filter oven dry, particle diameter D in obtaining
50Be the glass dust of 0.8 μ m.
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 the deionized water, make its dissolving and stir, obtain the corrosivity carrier solution of uniform component at 60 ℃.
Step 3: the preparation of front conductive silver slurry
Consist of: account for particle diameter D among the total amount 85wt%
50Be the ball shape silver powder of 0.65 μ m, 2.5wt% glass dust, 12.5wt% corrosivity carrier solution;
Above component is mixed, and grind 20 times, making its fineness is 6 μ m, get final product front conductive silver slurry finished product, testing its viscosity is 130.5 Pas.
Embodiment 2
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step 1: 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%, the 8wt% sodium carboxymethylcellulose, the deionized water of 76wt%, technology is identical with embodiment 1.
Step 3: the preparation of front conductive silver slurry
Identical with embodiment 1, promptly get front conductive silver slurry finished product, testing its viscosity is 136.8 Pas.
Embodiment 3
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step 1: the preparation of glass dust
Identical with embodiment 1.
Step 2: the configuration of corrosivity carrier
Consist of: 5.0wt% NaOH, the 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, promptly get front conductive silver slurry finished product, testing its viscosity is 145.8 Pas.
Embodiment 4
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step 1: the preparation of glass dust
Identical with embodiment 1.
Step 2: the configuration of corrosivity carrier
Consist of: 1.0wt% NaOH, the 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, promptly get front conductive silver slurry finished product, testing its viscosity is 148.4 Pas.
Embodiment 5
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: 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 the deionized water, make its dissolving and stir, obtain the corrosivity carrier solution of uniform component at 50 ~ 70 ℃.
Step 2: the preparation of back silver electrocondution slurry
Consist of: account for particle diameter D among the total amount 64wt%
50Be the ball shape silver powder of 1.25 μ m, the corrosivity carrier solution of 36wt%;
Above component is mixed, and grind 16 times, making its fineness is 10 μ m, promptly gets back silver electrocondution slurry finished product, and testing its viscosity is 72.8 Pas.
Embodiment 6
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: 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, promptly get back silver electrocondution slurry finished product, testing its viscosity is 78.6 Pas.
Embodiment 7
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: 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, pack in the porcelain crucible, put into silicon carbide rod furnace, heat up and be preheating to 550 ℃, insulation 0.5h rises to 1250 ℃, melting 0.5h again, shrend is filtered, and will obtain the glass slag ball grinder of packing into, the control of quality ratio, zirconia ball: bead: deionized water=2:1:0.5,100 rev/mins of jar speed, ball milling 72 hours, filter oven dry, particle diameter D in obtaining
50Be the glass dust of 1.5 μ m.
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 among the total amount 60wt%
50Be the ball shape silver powder of 1.25 μ m, the glass dust that the 4wt% step 1 obtains, the corrosivity carrier solution that the 36wt% step 2 obtains;
Above component is mixed, and grind 16 times, making its fineness is 10 μ m, promptly gets back silver electrocondution slurry finished product, and testing its viscosity is 84.3 Pas.
Embodiment 8
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: the configuration of corrosivity carrier
Consist of: 3.0wt% NaOH, the 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, promptly get back silver electrocondution slurry finished product, testing its viscosity is 88.6 Pas.
Embodiment 9
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: the bearer configuration of corrosivity carrier
Consist of: 1.0wt% NaOH, the 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, promptly get back silver electrocondution slurry finished product, testing its viscosity is 67.3 Pas.
Embodiment 10
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: 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, promptly get back silver electrocondution slurry finished product, testing its viscosity is 95.6 Pas.
Comparative example 1
The preparation of crystal silicon solar energy battery front conductive silver slurry.
Step 1: 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), the 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: front conductive silver slurry preparation
Consist of: particle diameter D among the 85wt%
50Be the ball shape silver powder of 0.65 μ m, the glass dust that 2.5wt% is obtained by step 1, the organic carrier that 12.5wt% is obtained by step 2;
Above component is mixed, and grind 20 times, making its fineness is 6 μ m, promptly gets front conductive silver slurry finished product, and testing its viscosity is 125.8 Pas.
Comparative example 2
The preparation of crystal silicon solar battery back face conductive silver slurry.
Step 1: 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 the 5.0wt% hexadecanol, the mixed solvent of 85wt%, mixed solvent adopts butyl carbitol: terpinol: butyl carbitol acetate=50:40:10.
Step 3: back silver electrocondution slurry preparation
Consist of: account for particle diameter D among the total amount 60wt%
50Be the ball shape silver powder of 1.25 μ m, the glass dust that 4.0wt% is obtained by step 1, the organic carrier that 36wt% is obtained by step 2;
Above component is mixed, and grind 16 times, making its fineness is 10 μ m, get final product back silver electrocondution slurry finished product, testing its viscosity is 76.2Pas.
The slurry of embodiment and comparative example being made by following technology is made into solar cell.
The electrocondution slurry of above-mentioned gained is on probation at production line, polysilicon chip specification: 156 * 156mm, before thickness is 200 μ m(corrosion), thickness is 180 μ m before the printing, and first printed back silver paste adopts the segmentation setting, number to be printed is about the 30mg/ sheet, oven dry republishes the back field aluminum paste material, oven dry, bake out temperature is 150 ℃, drying time is 5 minutes, republishes the front side silver paste material, crosses continuous tunnel furnace oven dry sintering then, the whole time is about 2 minutes, the sintering peak temperature is 900 ± 10 ℃, and the time is about 2 seconds, every performance of the back test battery sheet of coming out of the stove.When the performance of certain electrocondution slurry of test 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 16C of the Du Pont trade mark, and the back silver slurry adopts the PV505 of the Du Pont trade mark.
Performance test.
1, surface appearance: whether the back electrode surface of observing on the solar cell with 10 times of magnifying glasses has sand holes, pin hole or other bad phenomenon.
2, electrode side's resistance: adopt the square resistance of side's resistance tester test silver electrode film of crystalline silicon solar cell piece special use, unit is m Ω/.
3, battery series resistance: adopt the solar cell piece special test equipment to test.The m Ω of unit.
4, weld strength: select for use Shanghai to win footpath between fields 2*0.2mm tin lead welding band, soak the back oven dry, at 330 ℃ the back electrode that sinters is carried out manual welding then with Henkel X32-10I type scaling powder.After treating battery sheet natural cooling, use mountain degree SH-100 pull and push dynamometer along 45 ° of directions back electrode to be carried out tensile test, survey its average peeling force, unit is N.
5, electricity conversion: the electricity conversion of battery sheet solar cell piece special test equipment, test as the single flash operation simulator.Test condition is standard test condition (STC): light intensity: 1000W/m
2Spectrum: AM1.5; Temperature: 25 ℃.Method of testing is carried out according to IEC904-1.
The battery sheet that the slurry that embodiment and comparative example are made obtains is got 200 battery sheets respectively, and test gained result's mean value is listed in the table 1.
Table 1
| Numbering | The resistance of electrode side (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 |
Observing the back electrode surface of the solar battery sheet of various embodiments of the present invention can find with 10 times of magnifying glasses, adopts all smooth densification of electrode surface of the solar battery sheet that slurry provided by the present invention makes, no hole, and outward appearance is good.Simultaneously, the test result of embodiment 1-10 and comparative example 1-2 as can be seen from table 1, adopt the series resistance of the solar cell that obtains behind the sintering of prepared conductive silver slurry of the present invention little, side's resistance of electrode is also little, higher with the weld strength after the photovoltaic welding belt welding, the electricity conversion of battery also obviously improves.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. corrosivity carrier, comprise corrosive agent, oxidant, thickener and solvent, it is characterized in that, gross mass with described corrosivity carrier is a benchmark, the content of described corrosive agent is 1.0 ~ 10wt%, 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 is characterized in that, described corrosive agent is one or both in lithium hydroxide, NaOH, calcium hydroxide or the barium hydroxide.
3. corrosivity carrier as claimed in claim 1 is characterized in that, described corrosive agent is a NaOH.
4. corrosivity carrier as claimed in claim 1 is characterized in that, described oxidant is one or more in hydrogen peroxide, clorox, calcium hypochlorite, magnesium hypochlorite, barium hypochlorite, sodium chlorate, calcium chlorate, magron, the barium chlorate.
5. corrosivity carrier as claimed in claim 1 is characterized in that, described oxidant is hydrogen peroxide, clorox, sodium chlorate.
6. corrosivity carrier as claimed in claim 1, it is characterized in that, described thickener is the oiliness thickener, and described oiliness thickener is ethyl cellulose, propyl cellulose, butyl cellulose, alkyd resins, one or more in phenolic resins or the phenol-formaldehyde resin modified.
7. corrosivity carrier as claimed in claim 6 is characterized in that, described oiliness thickener is an ethyl cellulose.
8. corrosivity carrier as claimed in claim 1, it is characterized in that, described thickener is a 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 the PVP.
9. corrosivity carrier as claimed in claim 8 is characterized in that, described water-based thickener is sodium carboxymethylcellulose or polyvinyl alcohol.
10. corrosivity carrier as claimed in claim 1 is characterized in that, described solvent is organic solvent or water.
11. corrosivity carrier as claimed in claim 10 is characterized in that, described organic solvent comprises first organic solvent and second organic solvent; Described first organic solvent is one or both in methyl alcohol or the 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 the tributyl phosphate.
12. corrosivity carrier as claimed in claim 10 is characterized in that, described water is deionized water.
13. the preparation method as corrosivity carrier as described among the claim 1-12 any comprises corrosive agent, oxidant, thickener are dissolved in the solvent under 50 ~ 70 ℃.
14. 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 any described corrosivity carrier among the claim 1-12.
15. crystal silicon solar energy battery as claimed in claim 14 front conductive silver slurry, it is characterized in that, gross mass with described crystal silicon solar energy battery front conductive silver slurry is a 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 ~ 20 wt%.
16. a crystal silicon solar energy battery front conductive silver slurry preparation method comprises silver powder, glass dust and corrosivity carrier mixed grinding, gets the crystal silicon solar energy battery front conductive silver slurry described in the claim 14 or 15.
17. a crystal silicon solar battery back face conductive silver slurry comprises silver powder and corrosivity carrier, it is characterized in that, described corrosivity carrier is any described corrosivity carrier among the claim 1-12.
18. crystal silicon solar battery back face conductive silver slurry as claimed in claim 17 is characterized in that, described crystal silicon solar battery back face conductive silver slurry also comprises glass dust.
19. as claim 17 or 18 described crystal silicon solar battery back face conductive silver slurries, it is characterized in that, gross mass with described crystal silicon solar battery back face conductive silver slurry is a 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 ~ 50 wt%.
20. a crystal silicon solar battery back face conductive silver slurry preparation method comprises silver powder and corrosivity carrier mixed grinding, gets any described crystal silicon solar battery back face conductive silver slurry among the claim 17-19.
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