CN105621896A - Glass powder for back electrode slurry of solar battery and preparation method of glass powder - Google Patents
Glass powder for back electrode slurry of solar battery and preparation method of glass powder Download PDFInfo
- Publication number
- CN105621896A CN105621896A CN201511016300.XA CN201511016300A CN105621896A CN 105621896 A CN105621896 A CN 105621896A CN 201511016300 A CN201511016300 A CN 201511016300A CN 105621896 A CN105621896 A CN 105621896A
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- China
- Prior art keywords
- glass powder
- coated
- silicon
- solar cell
- electrode slurry
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
- C03C17/23—Oxides
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/21—Oxides
- C03C2217/213—SiO2
Abstract
The invention discloses glass powder for back electrode slurry of a solar battery and a preparation method of the glass powder. The glass powder is coated with silica sol so that the softening of the glass powder is delayed; the corrosion time on silicon wafers by softened glass is shortened and the corrosiveness on the silicon wafers by the glass is reduced, so that damages to a passivation layer are reduced.
Description
Technical field
The present invention relates to technical field of solar batteries, it is specifically related to photovoltaic industry high-performance silver conductor paste, in particular to a kind of glass powder for rear surface of solar cell electrode slurry and its preparation method.
Background technology
Such as, photovoltaic element (photovoltaicdevice) easily will be got due to it in light source (sunlight)
The energy transformation obtained becomes electric power, and to manipulate such as, the electronic installations such as computer, computer, well heater, so photovoltaic element is widely used. The most common photovoltaic element is silica-based solar cell.
Silica-based solar cell refers to the solar cell made by silicon metal base material utilizing and taking from monocrystalline silicon crystal bar or polycrystalline silicon ingot casting. Silica-based solar cell is formed the previous technology of electrode, after first utilizing the processing procedure coating metal slurries such as screen painting on the front surface and back surface of silica-based solar cell, need to perform two-step sintering program, the metal electrode with good ohmic contact could be formed. Typical silica-based solar cell, its front surface applying conductive silver slurry, its back surface applying conductive aluminium slurry and conductive silver paste (or conductive silver aluminium slurry).
Chinese patent application 201280009271.2 discloses one " contacting the method for silicon solar cell for the formation of the silver-colored backplate of passivation emitter with the back side ", and the silver slurry used wherein comprises at least one frit (glass powder). In sintering process, silicon chip can be produced corrosion by the frit of fusing, and then passivation layer is produced destruction.
Summary of the invention
For the problems referred to above, the present invention provides a kind of glass powder for rear surface of solar cell electrode slurry and its preparation method, low melting point, volatilizable macromolecular material is used first to carry out coated to glass powder, the softening of glass powder and fusing are delayed, to reduce the corrodibility to silicon chip of glass powder, and then reduce the destruction to passivation layer.
The technical scheme of the present invention is as follows:
For a glass powder for rear surface of solar cell electrode slurry, described glass powder is coated with low melting point, volatilizable silica sol layer.
One of main points of technical scheme of technical problem of solution prior art of the present invention select the coated glass powder of suitable macromolecular material, object is to delay in sintering process glass powder to the surface erosion of solar cell, instead of in order to avoid this kind to corrode, therefore, need the macromolecular material that fusing point is lower, if the macromolecular material fusing point selected is too high, the erosion of sintering process can be affected; Simultaneously, it is also desirable to this macromolecular material is fallen in volatilization as much as possible after sintering terminates, the impact on printed wiring itself is reduced, so to be selected volatilizable macromolecular material.
In macromolecular material, silicon sol belongs to colloidal solution, and without smelly, nontoxic, molecular formula can represent for mSiO2��nH2O. Due to the colloidal particle fine (10-20nm) of silicon sol, having sizable specific surface area, the water white transparency of particle own, does not affect the true qualities of coating cover material; And its viscosity is lower, the place that water can permeate can be permeated, and when therefore mixing with other material, dispersion property and perviousness are all very good; When silicon sol water evaporates, colloidal particle firmly is attached to the body surface of silver conductive paste, forms silica and combines, be good tackiness agent between particle.
The preparation method of a kind of above-mentioned glass powder for rear surface of solar cell electrode slurry provided by the invention, comprises the following steps:
(1) in the dilute solution of 20��40wt% soluble silicate, add ethanol, sodium sulfate etc., by regulating Na ion concentration, regulate the viscosity of solution further, regulate the content of silicon-dioxide in solution at 10-18%;
(2) in above-mentioned steps (1) gained system, add glass powder, it is glass powder according to part by weight: the ratio allotment of silicon-dioxide=2��3:3��5;
(3), after stirring 5-8 hour at above-mentioned steps (2) resultant bulk being tied up to room temperature 25��30 DEG C, filter;
(4) being dried by filtration products therefrom, control drying temperature, within the scope of 50��65 DEG C, is dried 3-5 hour, and products therefrom, relative to coated front glass powder weightening finish about 45��50%, must be coated with the glass powder particulate of silica sol layer.
Wherein said soluble silicate can be such as water glass, asbestos (CaMg3Si4O12), feldspar (K2Al2Si6O16), clay (Al2(OH)4Si2O5) etc. compound containing silicon, oxygen and other metallic element.
Compared with prior art, the useful effect of the present invention is as follows:
The present invention, by glass powder outer cladding silica sol layer, the glass powder product obtained can delay the softening of glass powder and fusing for solar cell, reduces glass powder fusing to the corrodibility of silicon chip, and then decreases the destruction to passivation layer.
Certainly, the arbitrary product implementing the present invention might not need to reach above-described all advantages simultaneously.
Embodiment
Herein, the scope represented by " numerical value is to another numerical value " is the summary representation of a kind of all numerical value avoiding enumerating in this scope in the description. Therefore, the record of a certain special value scope, the less numerical range containing any number in this numerical range and defining by any number in this numerical range is the same as expressly write out this any number numerical range less of this in the description.
Below in conjunction with specific embodiment, set forth the present invention further. It is to be understood that these embodiments are only for illustration of the present invention, and it is not intended to limit the scope of the invention. Technician makes according to the present invention in actual applications improvement and adjustment, still belong to protection scope of the present invention.
Embodiment 1
A kind of preparation method for the glass powder of rear surface of solar cell electrode slurry that the present embodiment provides is specific as follows:
1. in the dilute solution of 40% water glass, add ethanol, sodium sulfate etc., by regulating Na ion concentration, regulate the viscosity of solution further, regulate the content of silicon-dioxide in solution 18%;
2. in above-mentioned steps (1) gained system, add glass powder, according to weight ratio glass powder: the ratio allotment of silicon-dioxide=2:5;
3., after stirring 5 hours at above-mentioned steps (2) resultant bulk is tied up to room temperature 25��30 DEG C, filter;
4. being dried by filtration products therefrom, control drying temperature, within the scope of 50��65 DEG C, is dried 3 hours, increases weight about 50% relative to the glass powder before coated; The glass powder particulate of silica sol layer must be coated with.
Performance test:
The glass powder of coated front and back is carried out dsc analysis, dsc analysis result shows: the softening temperature of the glass powder of the coated silicon sol of the present embodiment is obviously delayed about 35 DEG C compared with not coated glass powder, reach the desired design of the present invention: the softening temperature being delayed glass powder by coated silicon sol, thus decrease glass powder fusing to the etching time of solar silicon wafers, reduce corrosive nature, and then decrease the destruction to passivation layer.
The concrete case that the novel glass powder using the silicon sol of the present embodiment coated makes sun power back of the body silver is as follows:
Ethyl cellulose is dissolved in Terpineol 350, dissolves clarification, stay the tackiness agent making slurry to use;
Getting silver powder 40-60 part, above-mentioned tackiness agent 25-35 part, with glass powder 1-8 part that silicon sol is coated, be jointly mixed with crude product slurry, upper three-roller carries out 3 grades and processes to obtain finished product slurry;
By the slurry of above-mentioned preparation, by being screen-printed on silicon electrode thin grid line, then the nodulizing by conventional sintering process, obtain the solar power silicon electrode slice that can test.
Solar power silicon electrode slice after the slurry printing make the novel glass powder coated with silicon sol has carried out following test, and the slurry made with conventional glass powder has contrasted.
Adopt the present embodiment coated after glass powder make silicon electrode, and with coated before glass powder make silicon electrode carry out the test of performance and compare, the performance test results is such as following table 1.
Table 1
As can be seen from Table 1, the silicon electrode performance that the glass powder after the coated improvement of the present embodiment makes is better than not carrying out the silicon electrode of coated glass powder making, and battery effect promotes, and the electricity conversion of unit surface improves.
Embodiment 2
A kind of preparation method for the glass powder of rear surface of solar cell electrode slurry that the present embodiment provides is specific as follows:
1. in the dilute solution of 20% water glass, add ethanol, sodium sulfate etc., by regulating Na ion concentration, regulate the viscosity of solution further, regulate the content of silicon-dioxide in solution 10%;
2. in above-mentioned steps (1) gained system, add glass powder, according to weight ratio glass powder: the ratio allotment of silicon-dioxide=3:3;
3., after stirring 8 hours at above-mentioned steps (2) resultant bulk is tied up to room temperature 25��30 DEG C, filter;
4. being dried by filtration products therefrom, control drying temperature, within the scope of 50��65 DEG C, is dried 5 hours, increases weight about 45% relative to the glass powder before coated; The glass powder particulate of silica sol layer must be coated with.
The present invention and above-described embodiment, by glass powder outer cladding silica sol layer, the glass powder product obtained can delay the softening of glass powder and fusing for solar cell, reduce glass powder fusing to the corrodibility of silicon chip, and then decrease the destruction to passivation layer.
Under the instruction of the present invention and above-described embodiment, those skilled in the art are easy to predict, the present invention cited or that enumerate each raw material or its equivalent alternative, each working method or its equivalent alternative can realize the present invention, and the parameter bound value of each raw material and working method, interval value can realize the present invention, do not enumerate embodiment at this.
Claims (3)
1. the glass powder for rear surface of solar cell electrode slurry, it is characterised in that, described glass powder is coated with low melting point, volatilizable silica sol layer.
2. the preparation method of the glass powder for rear surface of solar cell electrode slurry according to claim 1, it is characterised in that, comprise the following steps:
(1) in the soluble silicate dilute solution of 20��40wt%, add ethanol, sodium sulfate to regulate the viscosity of solution, regulate the content of silicon-dioxide in solution at 10-18%;
(2) in above-mentioned steps (1) gained system, add glass powder, it is glass powder according to weight ratio: the ratio allotment of silicon-dioxide=2��3:3��5;
(3), after stirring 5-8 hour at above-mentioned steps (2) resultant bulk being tied up to room temperature 25��30 DEG C, filter;
(4) being dried by filtration products therefrom, control drying temperature, within the scope of 50��65 DEG C, is dried 3-5 hour, and dry products therefrom, relative to coated front glass powder weightening finish about 45��50%, must be coated with the glass powder particulate of silica sol layer.
3. the preparation method of the glass powder for rear surface of solar cell electrode slurry according to claim 2, it is characterised in that, described soluble silicate be selected from water glass, asbestos, feldspar, clay one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016300.XA CN105621896B (en) | 2015-12-30 | 2015-12-30 | Glass dust for rear surface of solar cell electrode slurry and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016300.XA CN105621896B (en) | 2015-12-30 | 2015-12-30 | Glass dust for rear surface of solar cell electrode slurry and preparation method thereof |
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| Publication Number | Publication Date |
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| CN105621896A true CN105621896A (en) | 2016-06-01 |
| CN105621896B CN105621896B (en) | 2017-10-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63282131A (en) * | 1987-05-11 | 1988-11-18 | Mitsubishi Electric Corp | Production of whisker-reinforced glass |
| CN1101027A (en) * | 1993-09-29 | 1995-04-05 | 中国建筑材料科学研究院 | Technology for production of fiber reinforced glass and glass-ceramic base composite material |
| CN101861361A (en) * | 2007-10-04 | 2010-10-13 | 中村宪司 | Glass-containing molding composition and process for production of the same |
| CN103146301A (en) * | 2011-12-06 | 2013-06-12 | 中国科学院上海硅酸盐研究所 | Skutterudite based thermoelectric material, thermal protection coating for devices and preparation method thereof |
-
2015
- 2015-12-30 CN CN201511016300.XA patent/CN105621896B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63282131A (en) * | 1987-05-11 | 1988-11-18 | Mitsubishi Electric Corp | Production of whisker-reinforced glass |
| CN1101027A (en) * | 1993-09-29 | 1995-04-05 | 中国建筑材料科学研究院 | Technology for production of fiber reinforced glass and glass-ceramic base composite material |
| CN101861361A (en) * | 2007-10-04 | 2010-10-13 | 中村宪司 | Glass-containing molding composition and process for production of the same |
| CN103146301A (en) * | 2011-12-06 | 2013-06-12 | 中国科学院上海硅酸盐研究所 | Skutterudite based thermoelectric material, thermal protection coating for devices and preparation method thereof |
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| CN105621896B (en) | 2017-10-31 |
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