Auxiliary agent for manufacturing BC battery and application method of auxiliary agent

Abstract

The invention relates to the technical field of auxiliary agents for BC battery manufacturing, in particular to an auxiliary agent for BC battery manufacturing and an application method of the auxiliary agent. The invention relates to an auxiliary agent for manufacturing a BC battery. The auxiliary agent is prepared from the following substances in percentage by mass: 0.3-10% of a high-efficiency dispersant; 0.2%-15% of a surfactant; 0.1%-15% of a stabilizer; 3%-8% of an efficient nucleating agent; 0.1%-5% of a protective agent; and the balance of ultrapure water. According to the auxiliary agent for manufacturing the BC battery, the basic composition of the auxiliary agent for manufacturing the BC battery is optimized, and the protection of the n-poly surface and the p-ply surface of the back surface of the compatible silicon wafer is ensured by adding the protective agent and protecting the n-poly surface and the p-ply surface. After the auxiliary agent for manufacturing the BC battery prepared by the technical scheme of the invention is used, the difference between the textured edge and the middle area of a silicon wafer can be obviously reduced, so that the textured uniformity of the edge wound-plating area and the non-wound-plating area is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary agents for BC battery manufacturing, and in particular to an auxiliary agent for BC battery manufacturing and an application method thereof. Background Art

[0002] As an emerging photovoltaic technology, tunneling back contact solar cells (TBC) have attracted much attention due to their advantages in photoelectric conversion efficiency and manufacturing cost. Compared with traditional front contact solar cells, TBC solar cells significantly improve the light energy conversion efficiency and overall performance of the cell by designing the electrode on the back and optimizing current collection by using the quantum tunneling effect.

[0003] The first step in preparing TBC solar cells is the surface polishing process of silicon wafers. In the existing process of preparing TBC solar cells, silicon wafers need to be processed. However, in the process of texturing the single side of the silicon wafer, while texturing the front side, it is necessary to ensure the protection of the poly surface on the back side and corrosion of the gap area. If the poly surface is not well protected and the front side texture is not uniform, it will seriously affect the conversion efficiency and yield of photovoltaic cells. Summary of the invention

[0004] In order to improve the above technical problems, the present application provides an auxiliary agent for BC battery manufacturing and an application method thereof.

[0005] An auxiliary agent for BC battery manufacturing adopts the following technical solution:

[0006] An auxiliary agent for BC battery manufacturing is composed of the following substances in percentage by mass: 0.3%-10% of a high-efficiency dispersant; 0.2%-15% of a surfactant; 0.1%-15% of a stabilizer; 3%-8% of a high-efficiency nucleating agent; 0.1%-5% of a protective agent; and the balance is ultrapure water.

[0007] Through the above technical scheme, the present application optimizes the basic composition of auxiliary agents for BC battery manufacturing. First, the high-efficiency dispersant can make the components of the present application quickly and evenly dispersed in the texturing liquid. At the same time, the addition of surfactants added in the present application helps to reduce the surface tension of the liquid, further reduce the rapid desorption of production gas from the silicon wafer surface during the reaction, and improve the defect problem of reaction bubbles affecting the appearance of silicon wafers.

[0008] On this basis, the present application adds protective agents, n-poly and p-ply protection, thereby ensuring the protection of the n-poly surface and the p-ply surface on the back of the compatible silicon wafer, and effectively corroding the gap area. Finally, ultrapure water as the main solvent provides a good medium environment to ensure that the various components can be fully mixed and reacted. After use, the auxiliary agent for BC battery manufacturing prepared by the technical solution of the present application can significantly reduce the difference between the edge and middle area of ​​the silicon wafer velvet, thereby further improving the velvet uniformity of the edge plating area and the non-plating area.

[0009] Furthermore, the high-efficiency dispersant includes at least one of sodium dibutylnaphthalene sulfonate, polyepoxysuccinic acid and polycarboxylic acid water reducer.

[0010] Through the above technical scheme, this application optimizes and illustrates the selection of efficient dispersants. The selected sodium dibutylnaphthalene sulfonate as an anionic surfactant has good wettability and dispersibility, which can effectively improve its fluidity. Polyepoxysuccinic acid and polycarboxylic acid water reducer are functional polymers that improve the dispersion performance of additives in the texturing solution. Therefore, in the manufacturing process of BC batteries, the uniform dispersion of the texturing solution allows the silicon wafer to be texturized on the front side during the texturing process while ensuring the protection of the poly surface on the back side and the corrosion of the gap area, thereby further improving the uniformity of the velvet surface in the edge plating area and the non-plating area.

[0011] Furthermore, the surfactant includes at least one of sodium sulfate of fatty alcohol polyoxyethylene ether, sodium salt of acrylic acid homopolymer and maleic acid acrylic acid copolymer.

[0012] Through the above technical scheme, the present application further optimizes the composition of surfactants, including sodium sulfate of fatty alcohol polyoxyethylene ether / sodium salt of acrylic acid homopolymer and maleic acid acrylic acid copolymer. The addition of these surfactants is mainly to improve the fluidity of auxiliary agents used in BC battery manufacturing. Sodium sulfate of fatty alcohol polyoxyethylene ether is a commonly used anionic surfactant that can significantly reduce surface tension and increase its wettability, making it easier for the texturing liquid to penetrate into the surface of the battery substrate, thereby improving the uniformity and coverage of the velvet surface in the edge plating area and the non-plating area. Acrylic acid homopolymer helps to enhance the adhesion of the texturing liquid, improve the nucleation density of the texturing and the stability of the velvet surface within the cycle. Maleic acid acrylic acid copolymer can provide a certain fluidity and stability in the texturing liquid. Through the combined use of these surfactants, the uniformity of the velvet surface during the preparation of BC batteries can be effectively improved.

[0013] Furthermore, the stabilizer includes at least one of dodecyl glucoside, maltitol and tannic acid.

[0014] Furthermore, the high-efficiency nucleating agent includes at least one of sophoroside, chicoric acid and flax lignan.

[0015] Furthermore, the protective agent includes at least one of tea polyphenols, cocamidopropyl betaine and polyoxyethylene alkylamide.

[0016] Through the above technical scheme, the present application optimizes the protective agent component. Polyphenols, as a natural antioxidant, can improve the storage stability of this product and increase the storage life of the material. Its active ingredients can protect the active ingredients of the material by capturing free radicals and reducing the reaction rate. Cocamidopropyl betaine is a mild surfactant with good biocompatibility. It can improve the fluidity of the velvet making solution while protecting the material. The rational use of these protective agents can effectively improve the performance of auxiliary agents used in BC battery manufacturing, improve the conversion efficiency and reliability of solar cells, and lay a solid foundation for subsequent applications.

[0017] In a second aspect, the present application provides an application method of an auxiliary agent for BC battery manufacturing, comprising the following steps:

[0018] In the texturing step of the BC battery manufacturing process, add the auxiliary agent for BC battery manufacturing into the texturing tank, adjust the texturing process and perform the texturing treatment.

[0019] Through the above technical scheme, this application optimizes and describes the application method of auxiliary agents for BC battery manufacturing, especially the use in the texturing step. This process optimizes the BC battery manufacturing process by adding auxiliary agents to the texturing tank and adjusting the texturing process. The texturing process is an important step to improve the light absorption rate and energy conversion efficiency of the battery surface. In multiple manufacturing processes, the use of auxiliary agents can improve the fluidity, dispersibility and stability of the texturing liquid, thereby ensuring the uniformity and consistency of the texturing treatment.

[0020] Furthermore, the amount of the auxiliary agent added for BC battery manufacturing is:

[0021] The initial addition amount is 0.1-1.0% of the mass of the texturing liquid, and the additional addition amount is 0.1-0.8mL / pcs.

[0022] In summary, this application has the following beneficial effects:

[0023] First, the present application optimizes the basic composition of auxiliary agents for BC battery manufacturing. First, the high-efficiency dispersant can make the components of the present application quickly and evenly dispersed in the texturing liquid. At the same time, the addition of surfactants added in the present application helps to reduce the surface tension of the liquid, further reduce the rapid desorption of production gas from the silicon wafer surface during the reaction, and improve the defect problem of reaction bubbles affecting the appearance of silicon wafers.

[0024] On this basis, the present application adds protective agents, n-poly and p-ply protection, thereby ensuring the protection of the n-poly surface and the p-ply surface on the back of the compatible silicon wafer, and effectively corroding the gap area. Finally, ultrapure water as the main solvent provides a good medium environment to ensure that the various components can be fully mixed and reacted. After use, the auxiliary agent for BC battery manufacturing prepared by the technical solution of the present application can significantly reduce the difference between the edge and middle area of ​​the silicon wafer velvet, thereby further improving the velvet uniformity of the edge plating area and the non-plating area.

[0025] Second, this application optimizes and explains the selection of efficient dispersants. Sodium dibutylnaphthalene sulfonate is selected as an anionic surfactant with good wettability and dispersibility, which can effectively improve its fluidity. Polyepoxysuccinic acid and polycarboxylic acid water reducer are functional polymers that improve the dispersion performance of additives in the texturing solution. Therefore, in the manufacturing process of BC batteries, the uniform dispersion of the texturing solution allows the silicon wafer to be texturized on the front side while ensuring the protection of the poly surface on the back side and the corrosion of the gap area during the texturing process, thereby further improving the uniformity of the velvet surface in the edge plating area and the non-plating area.

[0026] Third, this application optimizes and describes the application method of auxiliary agents for BC battery manufacturing, especially the use in the texturing step. This process optimizes the BC battery manufacturing process by adding auxiliary agents to the texturing tank and adjusting the texturing process. The texturing process is an important step to improve the light absorption rate and energy conversion efficiency of the battery surface. In multiple manufacturing processes, the use of auxiliary agents can improve the fluidity, dispersibility and stability of the texturing solution, thereby ensuring the uniformity and consistency of the texturing treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Provide a production process roadmap for BC batteries;

[0028] Figure 2 This is a SEM image of the textured surface of the silicon wafer produced in step 9 of the BC battery production process in Example 10 of the present application;

[0029] Figure 3 This is an SEM image of the velvet surface of the silicon wafer produced in step 9 of the BC battery production process in comparative example 1 of the present application. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the embodiments.

[0031] In the examples of the present application, the raw materials and instruments used are as follows, but not limited thereto. Unless otherwise specified, they are analytically pure materials.

[0032] The present application is further described in detail below with reference to the embodiments.

[0033] Examples 1-9

[0034] An auxiliary agent for BC battery manufacturing, the formula and raw materials are shown in Table 1;

[0035] Table 1: Formula of Examples 1-9

[0036]

[0037] Examples 10-18

[0038] The auxiliary agent for BC battery manufacturing prepared in Example 1-9 is applied, and the specific application steps are as follows:

[0039] The initial addition amount is 0.5% of the mass of the texturing liquid, and the additional amount is 0.5 mL / pcs. The auxiliary agent for BC battery manufacturing prepared in Example 1-9 is added to the texturing liquid for texturing treatment. The texturing steps are as follows:

[0040] Dissolve 20g of sodium hydroxide in 940g of deionized water, add 40g of isopropanol to obtain 1000g of alkaline alcoholic texturing solution. Add 5g of BC battery manufacturing auxiliary agent to 1000g of alkaline alcoholic texturing solution, and then add BC battery manufacturing auxiliary agent at a supplementary amount of 0.5mL / pcs. Put the single crystal silicon wafer into the texturing solution with additives for surface texturing. The texturing temperature is 85℃ and the texturing time is 900s to complete the texturing.

[0041] Comparative Example 1

[0042] Dissolve 20g of sodium hydroxide in 940g of deionized water, add 40g of isopropanol to obtain 1000g of alkaline alcoholic texturing solution. Put the single crystal silicon wafer into the 1000g alkaline alcoholic texturing solution with additives for surface texturing, the texturing temperature is 85℃, the texturing time is 900s, and the texturing is completed.

[0043] Performance Testing

[0044] The silicon wafers prepared in Examples 10-18 and Comparative Example 1 were tested to determine the texture size of the silicon wafers, and the efficiency of the silicon wafers finally produced was tested;

[0045] Among them, the suede size is tested by zeta microscope, and the efficiency is tested by production line halm testing machine.

[0046] The details are shown in Table 2 below:

[0047] Table 2 Performance test table

[0048]

[0049]

[0050] Combined with Table 2, Figure 1-3 It can be seen from the technical solutions of Examples 1-9 of the present application that the present application optimizes the basic composition of auxiliary agents for BC battery manufacturing. First, the high-efficiency dispersant can enable the components of the present application to be quickly and evenly dispersed in the texturing liquid. At the same time, the addition of the surfactant added in the present application helps to reduce the surface tension of the liquid, further reducing the rapid desorption of production gas from the silicon wafer surface during the reaction, and improving the defect problem of reaction bubbles affecting the appearance of the silicon wafer.

[0051] On this basis, combined with Figure 2-Figure 3 By comparison, the velvet line marks of the velvet surface prepared in Example 10 are more minor, while the line marks in Comparative Example 1 are more obvious, which further illustrates that the present application adds protective agents, n-poly and p-ply protection, thereby ensuring the protection of the n-poly surface and the p-ply surface on the back of the compatible silicon wafer, and effectively corroding the gap area. Finally, ultrapure water as the main solvent provides a good medium environment to ensure that the various components can be fully mixed and reacted. After use, the auxiliary agent for BC battery manufacturing prepared by the technical solution of the present application can significantly reduce the difference between the edge and middle area of ​​the silicon wafer velvet, thereby further improving the velvet uniformity of the edge plating area and the non-plating area.

[0052] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0053] All publications, patent applications, patents and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings conventionally understood by those skilled in the art. In the event of a conflict, the definition in this specification shall prevail.

[0054] When this specification uses the prefix "well-known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, etc., the objects introduced by the prefix cover those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become recognized in the art as being suitable for similar purposes.

[0055] In the context of the present specification, any matters or items not mentioned are directly applicable to those known in the art without any changes except those explicitly stated.

Claims

1. An auxiliary agent for BC battery manufacturing, characterized in that It is composed of the following substances in percentage by mass: The balance was ultrapure water.

2. The auxiliary agent for BC battery manufacturing according to claim 1, characterized in that: The high-efficiency dispersant includes at least one of sodium dibutylnaphthalene sulfonate, polyepoxysuccinic acid and polycarboxylic acid water reducer.

3. The auxiliary agent for BC battery manufacturing according to claim 1, characterized in that: The surfactant includes at least one of sodium sulfate of fatty alcohol polyoxyethylene ether, sodium salt of acrylic acid homopolymer and maleic acid acrylic acid copolymer.

4. The auxiliary agent for BC battery manufacturing according to claim 1, characterized in that: The stabilizer includes at least one of lauryl glucoside, maltitol and tannic acid.

5. The auxiliary agent for BC battery manufacturing according to claim 1, characterized in that: The high-efficiency nucleating agent includes at least one of sophora flavescens glycoside, chicoric acid and flax lignan.

6. The auxiliary agent for BC battery manufacturing according to claim 1, characterized in that: The protective agent includes at least one of tea polyphenols, cocamidopropyl betaine and polyoxyethylene alkylamide.

7. The method for applying the auxiliary agent for BC battery manufacturing according to any one of claims 1 to 6, characterized in that: The steps include: In the texturing step of the BC battery manufacturing process, add the auxiliary agent for BC battery manufacturing into the texturing tank, adjust the texturing process and perform the texturing treatment.

8. The method for applying an auxiliary agent for BC battery manufacturing according to claim 7, characterized in that: The amount of the auxiliary agent added for BC battery manufacturing is: The initial addition amount is 0.1-1.0% of the mass of the texturing liquid, and the additional addition amount is 0.1-0.8mL / pcs.

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