Solar cell slurry, preparation method thereof and solar cell

Abstract

The invention provides solar cell slurry, a preparation method thereof and a solar cell, and relates to the field of solar cells, the solar cell slurry comprises the following components by mass: 0.3-0.8 part of lauryl alcohol ether phosphate, 78-85 parts of silver powder, 0.05-0.3 part of aluminum indium alloy powder, 11.9-20.65 parts of an organic binder, 1-3 parts of aluminum powder, and 1-2 parts of glass powder. The aluminum indium alloy powder in the solar cell slurry has strong metallic property, so that the solar cell slurry is easier to form ohmic contact with silicon in the doping process, the conductivity and open-circuit voltage of a cell are improved, the efficiency of the cell can be improved, and the lauryl alcohol ether phosphate as an auxiliary agent can reduce the viscosity of the solar cell slurry, so that the service life of the solar cell slurry is prolonged, and the service life of the solar cell slurry is prolonged. The lauryl alcohol ether phosphate is wrapped on the surface of the aluminum powder, so that the reaction of the aluminum powder and water can be effectively blocked, and the problem that fine grids on the front surface of the battery fall off in the use process can be solved.

Description

Technical Field

[0001] This invention relates to the field of solar cells, and more particularly to a solar cell paste, its preparation method, and a solar cell. Background Technology

[0002] TOPCON solar cells are a type of solar cell that uses an ultrathin tunneling oxide layer as a passivation layer. The TOPCON solar cell substrate is primarily an N-type silicon substrate. On the back of the cell, an ultrathin tunneling oxide layer of silicon oxide is fabricated using a wet process, followed by the deposition of a doped polycrystalline silicon thin layer. These two layers together form the passivation contact structure. Afterward, annealing and recrystallization are performed to enhance the passivation effect. TOPCON's back passivation contact structure provides excellent surface passivation for the back of the silicon wafer. The ultrathin oxide layer allows majority carriers (electrons) to tunnel into the polycrystalline silicon layer while blocking minority carrier (hole) recombination. Subsequently, majority carriers are laterally transported within the polycrystalline silicon layer and collected by the metal, thereby significantly reducing the metal-contact recombination current and improving the cell's open-circuit voltage and short-circuit current.

[0003] During use, some fine grids on the front of the TOPCON solar cells have slightly detached, affecting the cell efficiency. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this application provides a solar cell paste, a method for preparing the same, and a solar cell.

[0005] In a first aspect, this application provides a solar cell paste comprising the following components by weight: 0.3 to 0.8 parts lauryl ether phosphate, 78 to 85 parts silver powder, 0.05 to 0.3 parts aluminum indium alloy powder, 11.9 to 20.65 parts organic binder, 1 to 3 parts aluminum powder, and 1 to 2 parts glass powder.

[0006] In conjunction with the first aspect, in one possible implementation, the aluminum-indium alloy powder is a nano-sized aluminum-indium alloy powder, the aluminum-indium alloy powder has a first preset purity, and the aluminum-indium alloy powder has a first preset shape.

[0007] In conjunction with the first aspect, in one possible implementation, the silver powder is nanoscale silver powder, the silver powder has a second preset purity, and the silver powder has a second preset shape.

[0008] In conjunction with the first aspect, in one possible implementation, the organic adhesive comprises the following components by weight: 8 to 10 parts of polymer and 90 to 92 parts of organic solvent.

[0009] In conjunction with the first aspect, in one possible implementation, the polymer is a polymer with a low sintering residual viscoelastic modulus, and the organic solvent includes at least five of the following: terpineol, butylcarbohydrate, butylcarbohydrate acetate, tributyl citrate, Span 85, and 12 esters.

[0010] In conjunction with the first aspect, in one possible implementation, the glass powder comprises the following mass components: 18-22 parts Bi2O3, 8-10 parts Al2O3, 10-15 parts SiO2, 15-22 parts ZnO, 15-22 parts Sb2O5, 6-10 parts B2O3, and 15-25 parts TeO3.

[0011] In conjunction with the first aspect, in one possible implementation, the glass powder D50 has a particle size of 1.8 μm to 2.5 μm.

[0012] Secondly, this application provides a method for preparing solar cell paste, comprising: obtaining an organic binder and aluminum-indium alloy powder, mixing the organic binder and aluminum-indium alloy powder and performing a first dispersion treatment to obtain a first dispersion; obtaining an organic additive and glass powder, mixing the organic additive and glass powder and performing a second dispersion treatment to obtain a second dispersion; obtaining silver powder, and mixing the first dispersion, the second dispersion and the silver powder and performing a grinding treatment.

[0013] In conjunction with the second aspect, in one possible implementation, before the first dispersion, the second dispersion, and the silver powder are subjected to the grinding process, the first dispersion, the second dispersion, and the silver powder need to be subjected to a third dispersion process.

[0014] Thirdly, the solar cell provided in this application is made using the solar cell paste described above.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] The solar cell paste provided in this application comprises lauryl ether phosphate, silver powder, aluminum-indium alloy powder, organic binder, aluminum powder, and glass powder. Silver powder acts as a conductor, while glass powder, as a solid binder, binds the active material, conductive agent, and current collector, enhancing the electronic contact between the electrode active material and the conductive agent and current collector, thus providing stable support for the solar cell paste system. The organic binder uniformly disperses the silver powder, facilitating subsequent printing of the solar cell paste. Aluminum powder reduces the contact resistivity of the cell. Due to the strong metallic properties of indium, aluminum-indium alloy powder facilitates ohmic contact between the solar cell paste and silicon during doping, enabling more effective doping of silicon and resulting in a higher back electric field strength and increased carrier concentration, thereby improving the cell's conductivity and open-circuit voltage, and ultimately enhancing cell efficiency. Lauryl ether phosphate, as an additive, reduces the viscosity of the solar cell paste, and its coating on the aluminum powder surface effectively prevents the reaction between aluminum powder and water, mitigating the problem of fine grid shedding on the front side of the cell during use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic flowchart of the preparation method of solar cell paste is shown. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Example 1

[0025] This application provides a solar cell paste, which is a front-side silver-aluminum paste for solar cells, and the solar cell paste includes the following components by mass: 0.3 to 0.8 parts lauryl ether phosphate, 78 to 85 parts silver powder, 0.05 to 0.3 parts aluminum-indium alloy powder, 11.9 to 20.65 parts organic binder, 1 to 3 parts aluminum powder, and 1 to 2 parts glass powder. The silver powder in the solar cell paste serves as a conductor, and accounts for 78% to 85% of the paste's mass, ensuring its high-temperature resistance. The glass powder, as a solid binder, binds the active material, conductive agent, and current collector, enhancing the electronic contact between the electrode active material and the conductive agent and current collector, thus providing stable support for the solar cell paste system. The organic binder uniformly disperses the silver powder, facilitating subsequent printing of the solar cell paste. The aluminum powder reduces the battery's contact resistivity. The aluminum-indium alloy powder, due to the strong metallic properties of indium, allows the solar cell paste to more easily form ohmic contacts with silicon during doping, facilitating effective silicon doping and resulting in a higher aluminum back electric field strength and increased carrier concentration, thereby improving the battery's conductivity and open-circuit voltage, and ultimately enhancing battery efficiency. The lauryl ether phosphate, as an additive, reduces the viscosity of the solar cell paste, and its coating on the aluminum powder surface effectively prevents the aluminum powder from reacting with water, mitigating the problem of fine grid shedding on the front side of the battery during use.

[0026] In some embodiments, the aluminum-indium alloy powder is a nano-sized aluminum-indium alloy powder, the aluminum-indium alloy powder has a first preset purity, and the aluminum-indium alloy powder has a first preset shape.

[0027] In some embodiments, the first preset shape is spherical. Because the specific surface area of ​​the nano-sized aluminum-indium alloy powder particles is inversely proportional to their diameter, the nano-sized aluminum-indium alloy powder possesses higher surface energy and activity.

[0028] In some embodiments, the first preset purity is 99.9%. Using high-purity aluminum-indium alloy powder can effectively prevent the PN junction from being damaged due to excessive impurities in the aluminum-indium alloy powder. Furthermore, the indium atoms exposed on the surface of the nanoparticles in the aluminum-indium alloy powder have extremely high activity, making it easy to dope silicon and improve the conductivity of crystalline silicon. At the same time, the small particles of indium powder can easily fill the space of the micron-sized aluminum powder, making the conductive phase tightly arranged and forming a conductive network, which in turn helps to improve the conductivity and effectively improve the electrical performance of the battery.

[0029] In some embodiments, the silver powder is nanoscale silver powder, the silver powder has a second preset purity, and the silver powder has a second preset shape.

[0030] In some embodiments, the second preset shape is spherical. The silver powder serves as a conductor; the nano-sized silver powder reduces the gaps between the silver powder particles, effectively enhancing the connection between them and increasing the contact surface, thereby forming a conductive network to improve battery efficiency.

[0031] In some embodiments, the second preset purity is 99.999%. The high purity of the silver powder can effectively prevent excessive impurities from affecting the performance of the solar cell paste, thereby improving the electrical performance of the battery.

[0032] In some embodiments, the organic adhesive comprises the following components by weight: 8 to 10 parts of polymer and 90 to 92 parts of organic solvent.

[0033] In some embodiments, the polymer is a polymer with a low residual viscoelastic modulus after sintering. The organic solvent includes at least five of the following: terpineol, butylcarbohydrate, butylcarbohydrate acetate, tributyl citrate, Span 85, and twelfth alcohol ester, to ensure the drying effect of the solar cell paste and to prevent the grid lines from falling off after the solar cell paste is dried.

[0034] In some embodiments, the glass powder comprises the following components by mass: 18-22 parts Bi2O3, 8-10 parts Al2O3, 10-15 parts SiO2, 15-22 parts ZnO, 15-22 parts Sb2O5, 6-10 parts B2O3, and 15-25 parts TeO3.

[0035] In some embodiments, the particle size of the glass powder D50 is 1.8 μm to 2.5 μm.

[0036] The solar cell paste provided in this application contains lauryl ether phosphate, which coats the surface of aluminum powder and prevents the aluminum powder from reacting with water. This effectively improves the problem of grid shedding on the front side of the cell during use. Furthermore, the organic solvents in the paste include at least five of the following: terpineol, butylcarbohydrate, butylcarbohydrate acetate, tributyl citrate, Span 85, and twelfth alcohol ester. This ensures effective drying of the solar cell paste and prevents grid line shedding after drying. Additionally, the aluminum-indium alloy powder in the paste, due to the high metallicity of indium (i.e., higher activity), facilitates ohmic contact between the solar cell paste and silicon during doping, enabling more effective doping of silicon. This results in a higher aluminum back electric field strength and increased carrier concentration, effectively improving the cell's conductivity and open-circuit voltage, thus enhancing the cell's efficiency.

[0037] Example 2

[0038] Please see Figure 1 This application provides a method for preparing the solar cell paste described in Embodiment 1 above. The method for preparing the solar cell paste includes the following steps:

[0039] S100: Obtain organic binder and aluminum-indium alloy powder, and mix the organic binder and aluminum-indium alloy powder and then perform a first dispersion treatment to obtain a first dispersion.

[0040] S200: Obtain organic additives and glass powder, and then mix the organic additives and glass powder and perform a second dispersion treatment to obtain a second dispersion.

[0041] S300: Obtain silver powder, and then mix the first dispersion, the second dispersion and the silver powder together and perform grinding and third dispersion treatments in sequence.

[0042] In some embodiments, the organic binder in S100 is a mixture of a polymer and an organic solvent, wherein the polymer is a polymer with a low sintering residual viscoelastic modulus, and the organic solvent includes at least five of terpineol, butylcarbiol, butylcarbiol acetate, tributyl citrate, Span 85, and 12-ol ester.

[0043] In some embodiments, the mechanical binder and the aluminum-indium alloy powder in S100 are subjected to the first dispersion treatment by a disperser.

[0044] In some embodiments, the organic additive in S200 is lauryl ether phosphate, and the organic additive glass powder in S200 and the glass powder are subjected to the second dispersion treatment by a disperser.

[0045] In some embodiments, the first dispersion, the second dispersion, and the silver powder in S200 are subjected to the third dispersion process by a disperser.

[0046] Example 3

[0047] This application provides a solar cell made using the solar cell paste described in Embodiment 1 above, thus the solar cell has high efficiency.

[0048] To better illustrate the effect of the solar cell paste in Example 1 on improving the efficiency of the solar cells involved in this example, the following verification experiments were conducted:

[0049] Experimental Group 1: Obtain the first solar cell paste and screen print it onto a 182.2mm × 183.75mm monocrystalline N-TOPCon blue film silicon wafer using a 520-mesh screen to form a silver grid. After sintering in a sintering furnace with a peak sintering temperature of 758℃, obtain the first cell. The first solar cell paste includes the following components by mass: 0.3 parts lauryl ether phosphate, 80 parts silver powder, 0.05 parts aluminum indium alloy powder, 17.15 parts organic binder, 1 part aluminum powder, and 1.5 parts glass powder. The organic binder includes the following components by mass: 8 parts polymer and 92 parts organic solvent. The polymer is polymer N100 with low sintering residual viscoelastic modulus. The organic solvent consists of at least five of the following: terpineol, butylcarbiol, butylcarbiol acetate, tributyl citrate, Span 85, and 12-ol ester.

[0050] Experimental Group 2: Obtain the second solar cell paste and screen print it onto a 182.2mm × 183.75mm monocrystalline N-TOPCon blue film silicon wafer using a 520-mesh screen to form a silver grid. After sintering in a sintering furnace with a peak sintering temperature of 758℃, the second cell is obtained. The difference between the second solar cell paste and the first solar cell paste is that the second solar cell paste includes the following components by mass: 0.5 parts lauryl ether phosphate, 82 parts silver powder, 0.1 parts aluminum indium alloy powder, 14.4 parts organic binder, 1.5 parts aluminum powder, and 1.5 parts glass powder. The organic binder includes the following components by mass: 9 parts polymer and 91 parts organic solvent.

[0051] Experimental Group 3: Obtain the third solar cell paste and screen print it onto a 182.2mm×183.75mm monocrystalline N-TOPCon blue film silicon wafer using a 520-mesh screen to form a silver grid. After sintering in a sintering furnace with a peak sintering temperature of 758℃, the third cell is obtained. The difference between the third solar cell paste and the first solar cell paste is that the third solar cell paste includes the following components by mass: 0.8 parts lauryl ether phosphate, 83 parts silver powder, 0.2 parts aluminum indium alloy powder, 12.5 parts organic binder, 2 parts aluminum powder, and 1.5 parts glass powder. The organic binder includes the following components by mass: 10 parts polymer and 90 parts organic solvent.

[0052] Experimental Group 4: Obtain the fourth solar cell paste and screen print it onto a 182.2mm × 183.75mm monocrystalline N-TOPCon blue film silicon wafer using a 520-mesh screen to form a silver grid. After sintering in a sintering furnace with a peak sintering temperature of 758℃, the fourth cell is obtained. The difference between the fourth solar cell paste and the first solar cell paste is that the fourth solar cell paste includes the following components by mass: 1.2 parts lauryl ether phosphate, 86 parts silver powder, 0.2 parts aluminum indium alloy powder, 7.1 parts organic binder, 4 parts aluminum powder, and 1.5 parts glass powder. The organic binder includes the following components by mass: 10 parts polymer and 90 parts organic solvent.

[0053] Experimental Group 5: Obtain the fifth solar cell paste and screen print it onto a 182.2mm × 183.75mm monocrystalline N-TOPCon blue film silicon wafer using a 520-mesh screen to form a silver grid. After sintering in a furnace with a peak sintering temperature of 758℃, the fifth cell is obtained. The difference between the fifth solar cell paste and the first solar cell paste is that the organic additive in the fifth solar cell paste is the commonly used BYK109 from BYK Corporation. The fifth solar cell paste includes the following components by mass: 0.5 parts organic additive, 83 parts silver powder, 13.5 parts organic binder, 1.5 parts aluminum powder, and 1.5 parts glass powder. The organic binder includes the following components by mass: 10 parts polymer and 90 parts organic solvent.

[0054] Electrical performance tests were conducted on the first, second, third, fourth, and fifth batteries mentioned above, and the electrical performance comparison table of photoelectric conversion efficiency (Eff), open circuit voltage (Uoc), short circuit current (Isc), and fill factor (FF) was obtained as shown in Table 1. Then, acetic acid experiments were conducted on the first, second, third, fourth, and fifth batteries after the electrical performance tests were completed to obtain the photoelectric conversion efficiency comparison table in Table 2.

[0055] The specific procedure for the acetic acid experiment is as follows: Mix 300ml of pure water, 180g of potassium chloride and 34g of pure acetic acid and place them in a sealed box. Raise the temperature to 85℃ and place the first, second, third, fourth and fifth batteries in different sealed boxes. After reacting for 240 minutes, take them out for electrical performance testing.

[0056] Table 1. Comparison of Electrical Performance

[0057] Group Eff(%) Uoc(v) Isc(A) FF (%) Experimental Group 1 25.806 0.7261 13.885 85.25 Experimental Group 2 25.869 0.7265 13.895 85.35 Experimental Group 3 25.881 0.7275 13.915 85.15 Experimental Group 4 25.593 0.7225 13.855 85.15 Experimental Group 5 25.691 0.7255 13.875 85.01

[0058] Table 2 Comparison of Photoelectric Conversion Efficiency

[0059] Group Eff1(%) Eff2 (%) Experimental Group 1 25.806 24.516 Experimental Group 2 25.869 24.627 Experimental Group 3 25.881 24.587 Experimental Group 4 25.593 24.313 Experimental Group 5 25.691 17.470

[0060] Because it is difficult to guarantee that the experimental conditions are completely consistent, there are certain errors in the above experimental data, but these do not affect the final experimental results. As shown in Table 1, the photoelectric conversion efficiency of experimental group 3 is greater than that of experimental group 2, the photoelectric conversion efficiency of experimental group 2 is greater than that of experimental group 1, and the photoelectric conversion efficiency of experimental group 3 is greater than that of experimental group 5. Furthermore, the photoelectric conversion efficiency of experimental group 5 is greater than that of experimental group 4. In other words, experimental group 3 has the highest photoelectric conversion efficiency, and the photoelectric conversion efficiency of experimental groups 1, 2, and 3 are... The photoelectric conversion efficiency of experimental group 4 was greater than that of experimental group 5. The photoelectric conversion efficiency of experimental groups 1, 2 and 3 was greater than that of experimental group 5. Therefore, the solar cell paste containing the following components (0.3-0.8 parts lauryl ether phosphate, 78-85 parts silver powder, 0.05-0.3 parts aluminum indium alloy powder, 11.9-20.65 parts organic binder, 1-3 parts aluminum powder and 1-2 parts glass powder) improved the photoelectric conversion efficiency of the prepared solar cell and increased the overall efficiency of the solar cell. Table 2 shows that Eff1 represents the photoelectric conversion efficiency before the acetic acid experiment, and Eff2 represents the photoelectric conversion efficiency after the acetic acid experiment. As can be seen from Table 2, the photoelectric conversion efficiency of the fifth cell in Experimental Group 5 decreased by 32% after the acetic acid experiment, representing the largest decrease. Furthermore, observations showed that the fifth cell in Experimental Group 5 had the largest area of ​​fine grid detachment. Therefore, it can be concluded that solar cell paste containing the following mass components—0.3–0.8 parts lauryl ether phosphate, 78–85 parts silver powder, 0.05–0.3 parts aluminum indium alloy powder, 11.9–20.65 parts organic binder, 1–3 parts aluminum powder, and 1–2 parts glass powder—can effectively improve the problem of fine grid detachment and extend the cell's lifespan.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A solar cell paste, characterized by, The quality components include: 0.3-0.8 parts of lauryl ether phosphate, 78-85 parts of silver powder, 0.05-0.3 parts of aluminum-indium alloy powder, 11.9-20.65 parts of organic binder, 1-3 parts of aluminum powder, and 1-2 parts of glass powder.

2. The solar cell paste according to claim 1, wherein The aluminum-indium alloy powder is nanoscale aluminum-indium alloy powder, has a first preset purity, and has a first preset shape.

3. The solar cell paste of claim 2, wherein, The silver powder is nanoscale silver powder, has a second preset purity, and has a second preset shape.

4. The solar cell paste of claim 1, wherein The organic binder includes the following quality components: 8-10 parts of high-molecular polymer and 90-92 parts of organic solvent.

5. The solar cell paste of claim 4, wherein, The high-molecular polymer is a low-sintering-residue-viscoelastic modulus polymer, and the organic solvent includes at least five of the following: terpineol, butyl carbityl alcohol, butyl carbityl alcohol acetate, tributyl citrate, Span 85, and alcohol ester twelve.

6. The solar cell paste according to any one of claims 1 to 5, wherein The glass powder includes the following quality components: 18-22 parts of Bi2O3, 8-10 parts of Al2O3, 10-15 parts of SiO2, 15-22 parts of ZnO, 15-22 parts of Sb2O5, 6-10 parts of B2O3, and 15-25 parts of TeO3.

7. The solar cell paste according to any one of claims 1 to 5, wherein The D50 diameter of the glass powder is 1.8-2.5 μm.

8. A method of preparing a solar cell paste, characterized by, The method includes: obtaining an organic binder and aluminum-indium alloy powder, mixing the organic binder and the aluminum-indium alloy powder, and performing first dispersion treatment to obtain first dispersion material; obtaining an organic additive and glass powder, mixing the organic additive and the glass powder, and performing second dispersion treatment to obtain second dispersion material; obtaining silver powder, and mixing the first dispersion material, the second dispersion material, and the silver powder, and performing grinding treatment.

9. The method of claim 8, wherein the slurry is prepared by mixing the solar cell material and the dispersant in a solvent. Before the grinding treatment of the mixed first dispersion material, second dispersion material, and silver powder, third dispersion treatment is performed on the mixed first dispersion material, second dispersion material, and silver powder.

10. A solar cell, characterized by, The solar cell is prepared by using the solar cell paste according to any one of claims 1-7.

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