CN115101236A - Silver paste containing coated glass powder and crystalline silicon solar cell manufactured by silver paste - Google Patents

Silver paste containing coated glass powder and crystalline silicon solar cell manufactured by silver paste Download PDF

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CN115101236A
CN115101236A CN202210815978.8A CN202210815978A CN115101236A CN 115101236 A CN115101236 A CN 115101236A CN 202210815978 A CN202210815978 A CN 202210815978A CN 115101236 A CN115101236 A CN 115101236A
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silver paste
glass powder
silver
powder
solar cell
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吕步云
邵奕兴
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Zhejiang Yicheng Technology Co ltd
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Zhejiang Yicheng Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/14—Conductive material dispersed in non-conductive inorganic material
    • H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/06—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers
    • H01L31/068—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells

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Abstract

The application relates to the field of silver paste, and particularly discloses a silver paste containing coated glass powder and a crystalline silicon solar cell manufactured by the silver paste. The silver paste containing the coated glass powder comprises the following components: the coating glass powder comprises coating glass powder, silver powder, an organic carrier and an additive, wherein the coating glass powder is grinding-assisted dispersing agent and modified silane coated glass powder; a solar cell is prepared by printing silver paste on a cell substrate by a screen and sintering to obtain a front electrode and a grid line of a solar cell panel, and the required solar cell is obtained. The modified silane and the hydroxyl on the surfaces of the glass powder particles are subjected to hydrolysis reaction to form covalent bonds, the content of the hydroxyl on the surfaces of the glass powder particles is reduced, the glass powder is coated by the grinding-aid dispersing agent, the dispersion of the glass powder particles is promoted, the components in the silver paste are well infiltrated, the viscosity is stable, the printability of the silver paste is improved, the defects of virtual printing, grid breakage and the like are reduced, and the photoelectric conversion efficiency of the prepared crystalline silicon battery is up to more than 23%.

Description

Silver paste containing coated glass powder and crystalline silicon solar cell manufactured by silver paste
Technical Field
The application relates to the field of silver paste, in particular to silver paste containing coated glass powder and a crystalline silicon solar cell manufactured by the silver paste.
Background
The crystalline silicon solar cell is a device capable of responding to light energy and converting the light energy into electric energy, silver paste is one of main raw materials influencing the electric performance of the crystalline silicon solar cell, the silver paste mainly comprises silver powder, glass powder, an organic carrier and some additives, the glass powder is an important component, and during sintering, the glass powder is melted to bond the silver powder and a silicon substrate together to provide adhesive force for the paste.
The surface of the processed glass powder has hydroxyl and dangling bonds, so that the surface energy is large, after silver paste is prepared, the viscosity is large, the defects of virtual printing, grid breakage and the like can be generated on grid lines on a silicon wafer through screen printing, and parameters such as photoelectric conversion efficiency and the like are obviously poor when testing is carried out after high-temperature sintering and need to be improved.
Disclosure of Invention
In order to solve the problem that the grid line of the silver paste on the silicon wafer can generate virtual printing, grid breaking and other defects, the application provides the silver paste containing the coated glass powder and the crystalline silicon solar cell manufactured by the silver paste.
In a first aspect, the present application provides a silver paste containing coated glass powder, which adopts the following technical scheme:
the silver paste containing the coated glass powder comprises the following components in percentage by weight: 1-10wt% of coated glass powder, 75-91wt% of silver powder, 7.9-20wt% of organic carrier and 0-1wt% of additive, wherein the coated glass powder is grinding aid dispersant and modified silane coated glass powder.
By adopting the technical scheme, the modified silane and hydroxyl on the surfaces of the glass powder particles are subjected to hydrolysis reaction to form 'Si-O-glass powder particle surface' covalent bonds, and the covalent bonds are coated on the surfaces of the glass powder particles in a monomolecular layer manner, so that the content of the hydroxyl on the surfaces of the glass powder particles is reduced, the glass powder is coated by the grinding-aid dispersing agent, the grinding-aid dispersing agent is adsorbed on the surfaces of the glass powder, the dispersion of the glass powder particles is promoted, the agglomeration among the glass powder is inhibited, the prepared silver paste is well infiltrated among the silver powder, the glass powder, the organic carrier and the additive, the viscosity of the silver paste is further stable, the printability of the silver paste is improved, and the defects of false printing, grid breakage and the like are reduced.
The front electrode and the grid line of the crystalline silicon solar cell are prepared by adopting the silver paste, the silver paste uniformly penetrates through the antireflection film and the silicon substrate after being sintered to form a good ohmic contact interface, the adhesive force among the electrode, the grid line and the substrate is improved, the electrode, the grid line and the substrate are not easy to deform, and the prepared crystalline silicon solar cell has excellent performance.
Preferably, the glass powder is spheroidized glass powder.
By adopting the technical scheme, burrs and hollow uneven shapes exist on the surface of the spheroidized glass powder, the contact area between the grinding-aid dispersing agent and the modified silane and the glass powder is increased, the hydroxyl and dangling bonds on the surface of the spheroidized glass powder are smaller than those of the non-spheroidized glass powder, the surface energy and the oil absorption are superior to those of the non-spheroidized glass powder, and the coating effect is better under the condition that the grinding-aid dispersing agent and the modified silane are used together.
Preferably, the preparation method of the coated glass powder comprises the following steps: ball-milling and mixing the glass powder, the grinding-aid dispersant, the modified silane and the ethanol for 10-60min, and then drying for 1-2h at the temperature of 100 ℃ and 120 ℃.
Preferably, the mass ratio of the glass powder to the grinding aid dispersant to the modified silane to the ethanol is 1000: (1-5): (2-8): (2000-5000).
By adopting the technical scheme and the proportion, the coating effect of the glass powder is better.
Preferably, the organic carrier includes a resin and a solvent, the resin is any one of ethyl cellulose, cellulose acetate propionate, cellulose acetate butyrate, polyvinyl formal, polyvinyl butyral, epoxy resin, novolac epoxy resin and acrylic resin, and the solvent is one or more of ethanol, isopropanol, n-butanol, acetone, cyclohexanone, acetylacetone, diisobutyl ketone, ethylene glycol diethyl ether, ethyl propionate, diethylene glycol butyl ether acetate, propylene glycol methyl ether acetate and dimethyl adipate.
Preferably, the additive is selected from one or more of thixotropic agent, defoaming agent, thickening agent, plasticizer, antioxidant and rheological agent.
By adopting the technical scheme, the additive is added according to the requirement, so that the printing property of the silver paste is improved, and the conductivity of the silver paste is improved.
In a second aspect, the present application provides a crystalline silicon solar cell, which adopts the following technical scheme:
a solar cell is prepared by printing and sintering the silver paste on a cell substrate through a screen to obtain a front electrode and a grid line of a solar cell panel, and the required solar cell is obtained.
Preferably, the silver powder and the organic carrier are uniformly mixed and then heated to 50-60 ℃, then ultrasonic treatment is carried out at constant temperature for 5-10min, then the silver paste is uniformly mixed with other components to prepare silver paste, and the silver paste is used for preparing the front electrode and the grid line of the solar cell panel on the cell substrate through silk screen printing and sintering to obtain the required solar cell.
Through adopting above-mentioned technical scheme, silver powder is heated and takes place the inflation, when silver powder takes place to reunite, the silver powder top that is located the inside silver powder granule volume of reunion system and swells and will be located the outside looses, and volume expansion makes the gap grow between the adjacent silver powder granule, it infiltrates the silver powder granule surface to be convenient for organic carrier infiltration gap, weaken the absorption between the silver powder granule simultaneously, and under the effect of supersound, the collision through silver powder granule breaks away the silver powder granule of reunion, promote the dispersion of silver powder in organic granule, the net passing nature of silver thick liquids has been improved, reduce the screen blocking, help reducing virtual seal, the production of printing defects such as disconnected bars.
Preferably, the silver powder and the zinc stearate are ground and uniformly mixed, an organic carrier is added and uniformly mixed, then the mixture is heated to 50-60 ℃, then constant temperature ultrasound is carried out for 5-10min, then the mixture is uniformly mixed with other components to obtain silver paste, the silver paste is used for carrying out screen printing and sintering on a battery substrate to obtain a front electrode and a grid line of a solar panel, and the required solar battery is obtained, wherein the mass ratio of the silver powder to the zinc stearate is (10-15): 1.
by adopting the technical scheme, the zinc stearate has better hygroscopicity and lubricity, the water content of the silver powder can be reduced after the zinc stearate is mixed with the silver powder, the agglomerated silver powder is crushed by grinding, the agglomeration of silver powder particles caused by water content is reduced, the lubricity among the silver powder particles is increased, when the silver powder particles are mixed with an organic carrier, the silver powder particles are easier to slide relatively, the adsorption agglomeration among the silver powder particles is inhibited, the dispersibility of the silver powder in silver paste is improved, the net blocking is further reduced, and the printing effect of the silver paste is improved.
Preferably, the silver powder is spherical silver powder.
By adopting the technical scheme, the contact among the silver powder particles is point contact mostly, the change of gaps among the silver powder particles after expansion is more obvious, and the infiltration effect of the organic carrier is better.
In summary, the present application has the following beneficial effects:
1. according to the preparation method, grinding-aid dispersing agents and the glass powder coated with the modified silane are adopted, the modified silane and hydroxyl on the surfaces of glass powder particles are subjected to hydrolysis reaction to form covalent bonds, the hydroxyl content on the surfaces of the glass powder particles is reduced, the glass powder is coated with the grinding-aid dispersing agents, the dispersion of the glass powder particles is promoted, silver powder, glass powder, organic carriers and additives in silver paste are well infiltrated, the viscosity is stable, the printing performance of the silver paste is improved, the defects of virtual printing, grid breakage and the like are reduced, and the photoelectric conversion efficiency of the prepared crystalline silicon battery is up to more than 23%.
2. This application is through heating silver powder, and silver powder is heated and takes place to expand, and when silver powder took place to reunite, the silver powder top that is located the inside silver powder granule volume of reunion system and expands and will be located the outside scatters, and the gap grow between the adjacent silver powder granule, and the organic carrier infiltration gap of being convenient for soaks silver powder granule surface, weakens the absorption between the silver powder granule simultaneously to under the effect of supersound, collision each other between the silver powder granule promotes the dispersion of silver powder in organic granule, has improved the net sex of crossing of silver thick liquids.
3. According to the silver powder particle dispersing agent, the zinc stearate has good hygroscopicity and lubricity, agglomeration of silver powder particles caused by water content is reduced, relative sliding among the silver powder particles is increased, re-agglomeration of the silver powder particles is inhibited, and dispersion of the silver powder particles is further promoted.
Drawings
FIG. 1 is an SEM image of an uncoated (non-spheroidized) glass frit in the present application;
FIG. 2 is an SEM image of uncoated spheroidized glass powder according to the present application;
FIG. 3 is an SEM photograph of a coated glass frit obtained in preparation example 1 of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-3 and examples.
Raw materials Information source
Spheroidized glass powder D50=1.6-2.1
Glass powder (non-spheroidizing) D50=1.6-2.1
Flake silver powder D50=1.8-2.1
Spherical silver powder D50=1.8-2.1
Grinding-aid dispersant The model is as follows: AD8098, type: aqueous, viscosity: 30 mPa.S (25 ℃), pH: 5-6
Modified silanes Polyether silane, type: dynasylan 4148
Antioxidant agent Pasteur antioxidant 1010
Thixotropic agent Disibalong 6650
Defoaming agent 3062 Digao
The raw materials used in the following embodiments may be those conventionally commercially available unless otherwise specified.
Preparation examples of raw materials
Preparation example 1
Preparing the coated glass powder: ball-milling and mixing the spheroidized glass powder, the grinding-assisting dispersing agent, the modified silane and the ethanol for 10min, and then drying for 2h at 100 ℃.
The mass ratio of the spheroidized glass powder to the grinding-assisting dispersing agent to the modified silane to the ethanol is 1000: 5: 8: 5000.
preparation example 2
Preparing the coated glass powder: ball-milling and mixing spheroidized glass powder, a grinding-aid dispersant, modified silane and ethanol for 60min, and then drying for 1h at 120 ℃.
The mass ratio of the spheroidized glass powder to the grinding-aid dispersant to the modified silane to the ethanol is 1000: 3: 2: 2000.
preparation example 3
Preparing the coated glass powder: ball-milling and mixing the spheroidized glass powder, the grinding-assisting dispersing agent, the modified silane and the ethanol for 30min, and then drying for 2h at 110 ℃.
The mass ratio of the spheroidized glass powder to the grinding-assisting dispersing agent to the modified silane to the ethanol is 1000: 1: 6: 4000.
preparation example 4
The difference from preparation example 1 is that the spheroidized glass powder was replaced with a glass powder (non-spheroidized).
Preparation example 5
The difference from preparation example 1 is that the modified silane was replaced by dodecylsilane.
Preparation example 6
The difference from preparation example 1 is that no grinding aid dispersant is added.
Preparation example 7
The difference from preparation example 1 is that the grinding aid dispersant is not added, and the modified silane is replaced by dodecylsilane.
Examples
Example 1
The application discloses silver paste that contains balling glass powder includes following raw materials: the coating glass comprises coated glass powder, silver powder, an organic carrier and an additive, wherein the coated glass powder is prepared in preparation example 1, the organic carrier comprises resin and a solvent in a mass ratio of 1:6, the resin adopts ethyl cellulose, the solvent adopts ethanol, the additive adopts an antioxidant, the silver powder adopts spherical silver powder, and the content of each component is shown in the following tables 1-1 and 1-2.
The crystalline silicon solar cell manufactured by the silver paste is used for manufacturing a positive surface electrode and a grid line of a solar cell panel on a cell substrate by screen printing and sintering of the silver paste, and the required solar cell is obtained.
Example 2
The difference from example 1 is that the coated glass frit was obtained as in preparation example 2, the resin used was polyvinyl butyral, the solvent used was acetone and cyclohexanone in a mass ratio of 1:1, the additive used was an antifoaming agent and a thixotropic agent in a mass ratio of 1:1, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
Example 3
The difference from example 1 is that the coated glass frit was obtained in preparation example 3, the resin was polyvinyl butyral, the solvent was n-butanol, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
Example 4
The difference from example 1 is that the silver paste is prepared by a different process, and the contents of the components are shown in tables 1-1 and 1-2 below.
The crystalline silicon solar cell manufactured by the silver paste is prepared by uniformly mixing silver powder and an organic carrier, heating to 50 ℃, carrying out constant temperature ultrasonic treatment for 10min, uniformly mixing with other components to prepare silver paste, and carrying out screen printing and sintering on a cell substrate by using the silver paste to prepare a positive surface electrode and a grid line of a solar cell panel so as to obtain the required solar cell.
Example 5
The difference from example 4 is that, unlike the preparation process of the silver paste, the contents of the respective components are shown in tables 1 to 1 and 1 to 2 below.
Grinding and uniformly mixing silver powder and zinc stearate, adding an organic carrier, uniformly mixing, heating to 50 ℃, carrying out constant-temperature ultrasonic treatment for 10min, uniformly mixing with other components to obtain silver paste, and carrying out screen printing and sintering on a battery substrate by using the silver paste to obtain the front electrode and the grid line of the solar cell panel so as to obtain the required solar cell.
Wherein the mass ratio of the silver powder to the zinc stearate is 10: 1.
Example 6
The application discloses silver paste that contains balling glass powder includes following raw materials: the coating glass comprises coated glass powder, silver powder, an organic carrier and an additive, wherein the coated glass powder is prepared from preparation example 2, the organic carrier comprises resin and a solvent in a mass ratio of 1:6, the resin adopts polyvinyl butyral, the solvent adopts acetone and cyclohexanone in a mass ratio of 1:1, the additive adopts a defoaming agent and a thixotropic agent in a mass ratio of 1:1, the silver powder adopts spherical silver powder, and the content of each component is shown in the following tables 1-1 and 1-2.
The crystalline silicon solar cell manufactured by the silver paste is prepared by grinding and uniformly mixing silver powder and zinc stearate, adding an organic carrier, uniformly mixing, heating to 60 ℃, carrying out constant temperature ultrasonic treatment for 5min, uniformly mixing with other components to prepare the silver paste, and carrying out screen printing and sintering on a cell substrate by using the silver paste to prepare the front electrode and the grid line of the solar cell panel, thus obtaining the required solar cell.
Wherein the mass ratio of the silver powder to the zinc stearate is 15: 1.
Example 7
The application discloses silver paste that contains balling glass powder includes following raw materials: the coating glass comprises coated glass powder, silver powder, an organic carrier and an additive, wherein the coated glass powder is prepared in preparation example 3, the organic carrier comprises resin and a solvent in a mass ratio of 1:6, the resin adopts polyvinyl butyral, the solvent adopts n-butyl alcohol, the silver powder adopts spherical silver powder, and the content of each component is shown in the following tables 1-1 and 1-2.
The crystalline silicon solar cell manufactured by the silver paste is prepared by grinding and uniformly mixing silver powder and zinc stearate, adding an organic carrier, uniformly mixing, heating to 55 ℃, carrying out constant temperature ultrasonic treatment for 7min, uniformly mixing with other components to prepare a silver paste, and carrying out screen printing and sintering on a cell substrate by using the silver paste to prepare a front electrode and a grid line of a solar cell panel so as to obtain the required solar cell.
Wherein the mass ratio of the silver powder to the zinc stearate is 13: 1.
Example 8
The difference from example 5 is that the silver powder used was a plate-like silver powder, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
Example 9
The difference from example 1 is that the coated glass frit was obtained by preparation example 4, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
Example 10
The difference from example 4 is that the silver paste was prepared by a different process, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
The crystalline silicon solar cell manufactured by adopting the silver paste is subjected to ultrasonic treatment for 5-10min after the silver powder and the organic carrier are uniformly mixed, then the crystalline silicon solar cell is uniformly mixed with other components to prepare the silver paste, and the silver paste is used for preparing a front surface electrode and a grid line of a solar cell panel on a cell substrate through screen printing and sintering to obtain the required solar cell.
Example 11
The difference from example 5 is that zinc stearate was replaced with zinc sulfate, and the contents of the respective components are shown in tables 1-1 and 1-2 below.
Comparative example
Comparative example 1
The difference from example 1 is that the coated glass frit was replaced with silver paste of spheroidized glass frit as a blank control group.
Comparative example 2
The difference from example 1 is that a coated glass frit was obtained from preparation example 5, and the contents of each component are shown in tables 1-1 and 1-2 below.
Comparative example 3
The difference from example 1 is that a coated glass frit was obtained as in preparation example 6, and the contents of each component are shown in tables 1-1 and 1-2 below.
Comparative example 4
The difference from comparative example 3 is that the coated glass frit was obtained by preparative example 7, and the contents of each component are shown in tables 1-1 and 1-2 below.
TABLE 1-1 silver paste Components content Table
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7
Coated glass powder 1 10 5 1 1 10 5
Silver powder 91 79 75 91 91 79 75
Organic vehicle 7.9 10 20 7.9 7.9 10 20
Additive agent 0.1 1 0 0.1 0.1 1 0
TABLE 1-2 silver paste Components content Table
Example 8 Example 9 Example 10 Example 11 Comparative example 2 Comparative example 3 Comparative example 4
Coated glass powder 1 1 1 1 1 1 1
Silver powder 91 91 91 91 91 91 91
Organic vehicle 7.9 7.9 7.9 7.9 7.9 7.9 7.9
Additive agent 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Performance test
(1) And (3) detecting photoelectric conversion efficiency: the photoelectric conversion efficiency of the crystalline silicon solar cells prepared in examples 1-11 and comparative examples 1-4 was determined according to the national standard GB/T34160-2017, and the test results are shown in Table 2.
(2) And (3) detecting the printability: after the silver pastes prepared in examples 1 to 11 and comparative examples 1 to 4 were screen-printed on the battery substrate, the phenomenon was observed and recorded, and the test results are shown in table 2.
TABLE 2 test results of examples and comparative examples
Photoelectric conversion efficiency Printability detection
Example 1 23.4% No defects of virtual printing, broken grid and the like
Example 2 23.7% No defects of virtual printing, broken grid and the like
Example 3 23.5% No defects of virtual printing, broken grid and the like
Example 4 23.8% No defects of virtual printing, broken grid and the like
Example 5 24.0% No defects of virtual printing, broken grid and the like
Example 6 24.1% No defects of virtual printing, broken grid and the like
Example 7 24.0% No defects of virtual printing, broken grid and the like
Example 8 23.8% No defects of virtual printing, broken grid and the like
Example 9 23.1% No defects such as false printing, broken gate, etc
Example 10 23.5% No defects such as false printing, broken gate, etc
Example 11 23.8% No defects such as false printing, broken gate, etc
Comparative example 1 21.5% The virtual printing and broken grid appear on the surface of the substrate
Comparative example 2 22.3% Virtual printing appears on the surface of the substrate
Comparative example 3 22.6% Virtual printing appears on the surface of the substrate
Comparative example 4 21.9% Virtual printing and broken grid appear on the surface of the substrate
In summary, the following conclusions can be drawn:
1. by combining example 1 and comparative examples 1 to 4 and table 2, it can be seen that the reason why the photoelectric conversion efficiency of the crystalline silicon solar cell is improved and the defects such as virtual prints and broken grids on the surface of the cell substrate are reduced by coating the spheroidized glass powder with the modified silane and the grinding aid dispersant is probably that: the modified silane and the hydroxyl on the surfaces of the glass powder particles are subjected to hydrolysis reaction to form covalent bonds, the content of the hydroxyl on the surfaces of the glass powder particles is reduced, the glass powder particles are coated by the grinding-aid dispersing agent, the dispersion of the glass powder particles is promoted, the silver powder, the glass powder, the organic carrier and the additive are well infiltrated, the printability of the silver paste is improved, and the defects of virtual printing, grid breakage and the like are reduced.
2. As can be seen from the combination of examples 1, 4 and 10 and table 2, the heating of the mixture of the organic vehicle and the silver powder can improve the photoelectric conversion efficiency of the crystalline silicon solar cell, which may be due to: the silver powder is heated to expand, the silver powder positioned on the outer side is pushed away, gaps between adjacent silver powder particles are enlarged, an organic carrier is convenient to permeate the gaps to infiltrate the surfaces of the silver powder particles, the adsorption among the silver powder particles is weakened, the agglomerated silver powder particles are dispersed through the collision of the silver powder particles under the action of ultrasound, the dispersion of the silver powder in the organic particles is promoted, the printing effect of silver paste is improved, and the photoelectric conversion efficiency of the prepared crystalline silicon solar cell is further improved.
3. Combining examples 1, 5, 11 with table 2, it can be seen that mixing silver powder and zinc stearate before mixing the organic vehicle and silver powder can improve the photoelectric conversion efficiency of the crystalline silicon solar cell, which may be due to: the zinc stearate has good hygroscopicity and lubricity, reduces agglomeration of silver powder particles caused by water, can increase relative sliding among the silver powder particles, inhibits the agglomeration of the silver powder particles again, further promotes dispersion of the silver powder particles, and is beneficial to improving the photoelectric conversion efficiency of the prepared crystalline silicon solar cell.
4. As can be seen from the combination of examples 1, 5 and 8 and table 2, the photoelectric conversion efficiency of the crystalline silicon solar cell can be improved by using the spherical silver powder, which may be due to the following reasons: the contact among the spherical silver powder particles is point contact, the change of gaps among the expanded silver powder particles is more obvious, and the infiltration effect of the organic carrier is better.
5. As can be seen from the combination of examples 1 and 9 and table 2, the use of the spheroidized glass powder can improve the photoelectric conversion efficiency of the crystalline silicon solar cell, which may be due to: the spherical glass powder has burrs and uneven pits on the surface, the contact area between the grinding-aid dispersant and the modified silane and the glass powder is increased, the hydroxyl and dangling bonds on the surface of the spherical glass powder are smaller than those of the glass powder, the surface energy and the oil absorption are superior to those of the glass powder, and the coating effect of the modified silane and the grinding-aid dispersant is better.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The silver paste containing the coated glass powder is characterized by comprising the following components in percentage by weight: 1-10wt% of coated glass powder, 75-91wt% of silver powder, 7.9-20wt% of organic carrier and 0-1wt% of additive, wherein the coated glass powder is grinding aid dispersant and modified silane coated glass powder.
2. The coated glass frit-containing silver paste according to claim 1, wherein: the glass powder is spheroidized glass powder.
3. The coated glass frit-containing silver paste according to claim 1, wherein: the preparation method of the coated glass powder comprises the following steps: ball milling and mixing the glass powder, the grinding-assisting dispersant, the modified silane and the ethanol for 10-60min, and then drying for 1-2h at the temperature of 100-120 ℃.
4. The silver paste containing a coated glass frit according to claim 3, wherein: the mass ratio of the glass powder to the grinding aid dispersant to the modified silane to the ethanol is 1000: (1-5): (2-8): (2000-5000).
5. The coated glass frit-containing silver paste according to claim 1, wherein: the organic carrier comprises resin and solvent, the resin is any one of ethyl cellulose, cellulose acetate propionate, cellulose acetate butyrate, polyvinyl formal, polyvinyl butyral, epoxy resin, novolac epoxy resin and acrylic resin, and the solvent is one or more of ethanol, isopropanol, n-butanol, acetone, cyclohexanone, acetylacetone, diisobutyl ketone, ethylene glycol diethyl ether, ethyl propionate, diethylene glycol butyl ether acetate, propylene glycol methyl ether acetate and dimethyl adipate.
6. The coated glass frit-containing silver paste according to claim 1, wherein: the additive is selected from one or more of thixotropic agent, defoaming agent, thickening agent, plasticizer, antioxidant and rheological agent.
7. A crystalline silicon solar cell, characterized by: and (3) screen printing and sintering the silver paste on a battery substrate to obtain a front electrode and a grid line of the solar panel, so as to obtain the required solar battery.
8. The crystalline silicon solar cell of claim 7, wherein: uniformly mixing silver powder and an organic carrier, heating to 50-60 ℃, carrying out constant temperature ultrasonic treatment for 5-10min, uniformly mixing with other components to obtain silver paste, and carrying out screen printing and sintering on a battery substrate by using the silver paste to obtain a front electrode and a grid line of a solar panel so as to obtain the required solar battery.
9. The crystalline silicon solar cell of claim 8, wherein: grinding and uniformly mixing silver powder and zinc stearate, adding an organic carrier, uniformly mixing, heating to 50-60 ℃, carrying out constant-temperature ultrasonic treatment for 5-10min, uniformly mixing with other components to obtain silver paste, and carrying out screen printing and sintering on a battery substrate by using the silver paste to obtain a front electrode and a grid line of a solar panel to obtain the required solar battery, wherein the mass ratio of the silver powder to the zinc stearate is (10-15): 1.
10. the crystalline silicon solar cell of claim 9, wherein: the silver powder is spherical silver powder.
CN202210815978.8A 2022-07-12 2022-07-12 Silver paste containing coated glass powder and crystalline silicon solar cell manufactured by silver paste Pending CN115101236A (en)

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CN112358191A (en) * 2020-11-11 2021-02-12 上海大洲电子材料有限公司 Formula, preparation and surface modification methods of lead-free low-melting-point glass powder for conductive paste
CN113077922A (en) * 2021-03-29 2021-07-06 浙江奕成科技有限公司 Silver paste containing spheroidized glass powder and crystalline silicon solar cell manufactured by using silver paste
CN113880435A (en) * 2021-07-16 2022-01-04 杭州正银电子材料有限公司 Modified glass powder for PERC back silver paste and preparation method and application thereof
CN114267474A (en) * 2021-12-27 2022-04-01 无锡帝科电子材料股份有限公司 High-performance metallization paste for solar cell and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101759371A (en) * 2009-11-03 2010-06-30 四川虹欧显示器件有限公司 Glass powder with surface modification, electric conduction slurry containing glass powder and surface modification method
CN101887764A (en) * 2010-06-28 2010-11-17 彩虹集团公司 Method for preparing silicon-based solar front silver paste
CN103617821A (en) * 2013-11-29 2014-03-05 江苏瑞德新能源科技有限公司 Solar cell aluminum-back paste with low printing wet weight
CN108010602A (en) * 2017-11-29 2018-05-08 华东理工大学 A kind of preparation process of Nano glass powder
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CN110950540A (en) * 2019-11-11 2020-04-03 上海银浆科技有限公司 Surface modification method of glass for front silver paste of solar cell
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CN113880435A (en) * 2021-07-16 2022-01-04 杭州正银电子材料有限公司 Modified glass powder for PERC back silver paste and preparation method and application thereof
CN114267474A (en) * 2021-12-27 2022-04-01 无锡帝科电子材料股份有限公司 High-performance metallization paste for solar cell and preparation method thereof

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