Organic carrier suitable for main grid silver paste fine line printing of TopCon solar cell
By optimizing the composition and printing conditions of the organic carrier for TopCon solar cells, the problems of unevenness and grid breakage in the fine line printing of the main grid silver paste were solved, thereby improving the fluidity of the silver paste and the performance of the cells, and promoting the efficient production and application of solar cells.
Patent Information
- Application Number
- CN202411249219.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-01-10
AI Technical Summary
TopCon solar cells suffer from problems such as uneven lines, broken grids, and silver particle agglomeration during the printing of silver paste fine lines on the main grid, which leads to a decrease in cell performance and affects cost optimization and photoelectric conversion efficiency.
By carefully selecting and optimizing the types and proportions of components in the organic carrier, including solvents, thixotropic agents, thickeners, and dispersants, and combining them with appropriate printing conditions, the fluidity and stability of the silver paste can be controlled, preventing silver particle agglomeration and improving adhesion and flexibility.
It achieves precision and stability in fine-line printing, reduces silver paste consumption, improves the short-circuit current and efficiency of solar cells, avoids grid breakage, and supports the efficient production of TopCon solar cells.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of solar cells, in particular to an organic carrier suitable for printing fine lines of silver paste on a main grid of a TopCon solar cell. Background Art
[0002] With the transformation and upgrading of the global energy structure, solar energy, as a clean and renewable energy source, has received widespread attention. As an important type of solar cell, Top-Con solar cells have the advantages of high efficiency and high stability and are widely used in the field of photovoltaic power generation. However, in the production process of TopCon solar cells, the fine-line printing technology of the main grid silver paste has always been a key factor restricting its performance improvement. In order to reduce the consumption of silver paste, the main grid line of the cell has been reduced from the previous 100μm to the current 20μ. However, when the main grid silver paste is printed in fine lines, problems such as uneven lines, broken grids, and silver particle agglomeration often occur, resulting in a decrease in battery performance, which seriously restricts the optimization of battery cost and the improvement of photoelectric conversion efficiency. Therefore, the development of an organic carrier suitable for the fine-line printing of the main grid silver paste of TopCon solar cells is of great significance to improving the efficiency and performance of solar cells. Summary of the invention
[0004] In order to solve the above problems, the present invention provides an organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid, comprising the following raw materials in percentage by weight: 60-80% of solvent, 2-8% of thixotropic agent, 2-30% of thickener resin, and 1-5% of dispersant; wherein the solvent comprises one or more of butyl carbitol, dodecanol, hexadecanol, butyl carbitol acetate, diethylene glycol monohexyl ether, propylene glycol phenyl ether acetate, and dimethyl adipate. The present invention focuses on the selection and matching of solvents. As another important component of the organic carrier, the type and ratio of the solvent also have an important influence on the printing effect of the silver paste and the battery performance. The present invention conducts in-depth research on the physicochemical properties of different solvents and their influence on the performance of the silver paste.
[0005] Preferably, the mass percentage of butyl carbitol is 10% to 50%, the mass percentage of butyl carbitol acetate is 10% to 50%, and the mass percentage of dimethyl adipate is 5% to 45%.
[0006] Preferably, the thickener comprises the following components: cellulose acetate butyrate, ethyl cellulose, polyaldehyde resin, rosin resin, and acrylic resin. Calculated by mass percentage of the organic carrier, the mass proportion of the cellulose acetate butyrate is 0-4%, the mass proportion of the ethyl cellulose is 0.5-12%, the mass proportion of the acrylic resin is 0.5-8%, and the mass proportion of the polyaldehyde resin is 5%-30%. The present invention optimizes the adhesion and flexibility of the organic carrier by regulating the type and amount of resin, and the resin is a key component of the organic carrier.
[0007] Preferably, the thixotropic agent comprises the following ingredients: hydrogenated castor oil, polyamide wax, fumed silica, and organic bentonite. Calculated by mass percentage of the organic carrier, the mass proportion of the hydrogenated castor oil is 0.1-2%, the mass proportion of the polyamide wax is 1.5-6%, the mass proportion of the fumed silica is 0.5-3%, and the mass proportion of the organic bentonite is 0.3-2.5%.
[0008] Preferably, the dispersant comprises the following components: castor oil, oleic acid, phosphate, BYK204, and Span 85. Based on the mass of the organic carrier, the mass percentage of the castor oil is 0.5% to 2%, the mass percentage of the oleic acid is 0.1% to 1.5%, the mass percentage of the phosphate is 0 to 2%, the mass percentage of the BYK204 is 0 to 0.5%, and the mass percentage of the Span 85 is 0 to 1.5%. The present invention further improves the performance of the organic carrier by introducing a thixotropic agent and a dispersant.
[0009] Preferably, the silver paste for the main grid on the front side of the Topcon battery further comprises 78-86% spherical silver powder, 0.6-2.5% glass powder, 10-20% organic carrier, and 0-1% additive.
[0010] Preferably, the method for preparing the front main grid silver paste comprises the following steps: Step 1: weigh 16.5% of organic carrier, 82% of silver powder, and 1.5% of inorganic glass powder by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix them using a centrifuge; Step 3: Put the materials pre-mixed in the centrifuge in step 2 into a constant temperature three-roll grinder, and use the constant temperature three-roll grinder to fully mix and grind to obtain the front main grid silver paste.
[0011] Preferably, the silver powder is a commercial product, the inorganic glass powder is homemade, and the silver powder particle size D500 is 0.76-0.85 μm.
[0012] Preferably, the front main grid silver paste obtained in the step three is printed on an N-type TopCon non-SE blue film for testing, using a 3-line screen printing screen with a line width of 20 microns, a cell size of 182.20 mm*183.75 mm, screen printing, drying and metallization sintering all use production line process parameters, and the peak temperature of the belt furnace sintering furnace is 750°C.
[0013] A method for preparing an organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grids, characterized in that it comprises the following steps: Step 1: Weigh 15% butyl carbitol, 40% butyl carbitol acetate, 15% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1% oleic acid, and 0.7% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0014] The present invention provides an organic carrier suitable for printing fine lines of silver paste on the main grid of TopCon solar cells. It has the following beneficial effects: By carefully selecting and optimizing the types and proportions of each component, the fluidity of the silver paste is effectively controlled, thereby ensuring the accuracy and stability of fine line printing. During the preparation process, the synergistic effect of each component makes the organic carrier have good adhesion and flexibility, and the weather resistance is also significantly improved. In addition, the present invention also optimizes the aspect ratio of the grid line by adjusting the conditions of screen printing, effectively avoiding the occurrence of broken grid. This not only reduces the consumption of silver paste, but also improves the short-circuit current and efficiency of the battery cell, providing strong technical support for the production and application of Top-Con solar cells; The present invention optimizes the adhesion and flexibility of the organic carrier by regulating the type and amount of resin. As a key component of the organic carrier, the selection of the type and amount of the resin directly affects the performance of the silver paste. When screening the resin, the present invention pays attention to factors such as the molecular structure, molecular weight distribution and functional groups of the resin to ensure its compatibility and interaction with components such as silver particles and glass powder. At the same time, by accurately controlling the amount and type of the resin, the present invention achieves effective regulation of the fluidity of the silver paste, thereby ensuring the uniformity and stability of fine line printing. The present invention also pays attention to the selection and matching of the solvent. As another important component of the organic carrier, the type and ratio of the solvent also have an important influence on the printing effect of the silver paste and the battery performance. The present invention deeply studies the physical properties of different solvents. Chemical properties and their impact on the performance of silver paste, carefully selected and matched a variety of solvents to achieve precise control of the fluidity of silver paste, the selection of these solvents not only takes into account their solubility and volatility, but also focuses on their dissolution and dispersion of silver particles and resins to ensure that the silver paste can maintain stable performance during the printing process. In addition, the present invention further improves the performance of the organic carrier by introducing a thixotropic agent and a dispersant. The addition of the thixotropic agent enables the organic carrier to have better rheology and thixotropy during the printing process, which can effectively prevent the agglomeration and sedimentation of silver particles, and ensure the uniformity and clarity of fine line printing, while the introduction of the dispersant helps to enhance the dispersing effect of the organic carrier on the silver particles, so that the silver particles can be more evenly distributed in the slurry, further improving the printing quality and battery performance. DETAILED DESCRIPTION
[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0016] Example 1 The present embodiment provides an organic carrier suitable for fine-line printing of silver paste for main grid of TOPCon solar cells, comprising the following raw materials: 15% butyl carbitol, 40% butyl carbitol acetate, 15% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1% oleic acid, and 0.7% castor oil.
[0017] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 15% butyl carbitol, 40% butyl carbitol acetate, 15% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1% oleic acid, and 0.7% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0018] The topcon front main grid silver paste described in this embodiment also includes the following components in percentage by weight: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic carrier.
[0019] Example 2 The present embodiment provides an organic carrier suitable for fine-line printing of silver paste for main grid of TOPCon solar cells, and its raw material composition is as follows: 15% butyl carbitol, 25% butyl carbitol acetate, 30% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1.2% oleic acid, and 0.5% castor oil.
[0020] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 15% butyl carbitol, 25% butyl carbitol acetate, 30% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1.2% oleic acid, and 0.5% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0021] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0022] Example 3 The present embodiment provides an organic carrier suitable for printing fine lines of silver paste for main grid of TOPCon solar cells, and its raw material composition is as follows: 15% butyl carbitol, 15% butyl carbitol acetate, 45% dimethyl adipate, 6% ethyl cellulose, 13% polyaldehyde resin, 3% acrylic resin, 4.3% polyamide wax, 1.5% organic bentonite, 0.5% fumed silica, 1.3% oleic acid, and 0.4% castor oil.
[0023] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 15% butyl carbitol, 15% butyl carbitol acetate, 45% dimethyl adipate, 6% ethyl cellulose, 13% polyaldehyde resin, 3% acrylic resin, 4.3% polyamide wax, 1.5% organic bentonite, 0.5% fumed silica, 1.3% oleic acid, and 0.4% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0024] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0025] Example 4 The present embodiment provides an organic carrier suitable for printing fine lines of silver paste for the main grid of TOPCon solar cells, and its raw material composition is as follows: 15% butyl carbitol, 50% butyl carbitol acetate, 5% dimethyl adipate, 10% ethyl cellulose, 9% polyaldehyde resin, 3% acrylic resin, 4.5% polyamide wax, 1% organic bentonite, 0.8% fumed silica, 0.7% oleic acid, and 1% castor oil.
[0026] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 15% butyl carbitol, 50% butyl carbitol acetate, 5% dimethyl adipate, 10% ethyl cellulose, 9% polyaldehyde resin, 3% acrylic resin, 4.5% polyamide wax, 1% organic bentonite, 0.8% fumed silica, 0.7% oleic acid, and 1% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0027] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0028] Example 5 The present embodiment provides an organic carrier suitable for printing fine lines of silver paste for main grid of TOPCon solar cells, and its raw material composition is as follows: 35% butyl carbitol, 20% butyl carbitol acetate, 15% dimethyl adipate, 7% ethyl cellulose, 9% polyaldehyde resin, 6% acrylic resin, 3% polyamide wax, 2.3% organic bentonite, 1% fumed silica, 1.2% oleic acid, and 0.5% castor oil.
[0029] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 35% butyl carbitol, 20% butyl carbitol acetate, 15% dimethyl adipate, 7% ethyl cellulose, 9% polyaldehyde resin, 6% acrylic resin, 3% polyamide wax, 2.3% organic bentonite, 1% fumed silica, 1.2% oleic acid, and 0.5% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0030] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0031] Example 6 The present embodiment provides an organic carrier suitable for fine-line printing of silver paste for main grid of TOPCon solar cells, and its raw material composition is as follows: 50% butyl carbitol, 10% butyl carbitol acetate, 10% dimethyl adipate, 5% ethyl cellulose, 9% polyaldehyde resin, 8% acrylic resin, 3.1% polyamide wax, 2% organic bentonite, 1.2% fumed silica, 1.4% oleic acid, and 0.3% castor oil.
[0032] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 50% butyl carbitol, 10% butyl carbitol acetate, 10% dimethyl adipate, 5% ethyl cellulose, 9% polyaldehyde resin, 8% acrylic resin, 3.1% polyamide wax, 2% organic bentonite, 1.2% fumed silica, 1.4% oleic acid, and 0.3% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0033] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0034] Comparative Example 1 The present embodiment provides an organic carrier suitable for fine-line printing of main grid silver paste for TOPCon solar cells, and its raw material composition is as follows: 70% butyl carbitol, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil.
[0035] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 70% butyl carbitol, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0036] In this comparative example, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0037] Comparative Example 2 The present embodiment provides an organic carrier suitable for fine-line printing of silver paste for the main grid of TOPCon solar cells, and its raw material composition is as follows: 70% butyl carbitol acetate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil.
[0038] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 70% butyl carbitol acetate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0039] In this comparative example, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0040] Comparative Example 3 The present embodiment provides an organic carrier suitable for fine-line printing of main grid silver paste for TOPCon solar cells, and its raw material composition is as follows: 70% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil.
[0041] The method for preparing the organic carrier comprises the following steps: Step 1: Weigh 70% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.5% organic bentonite, 0.8% fumed silica, 1.2% oleic acid, and 0.5% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.
[0042] In this embodiment, the composition of the topcon front main grid silver paste is as follows: 82% silver powder, 1.5% inorganic glass powder, and 16.5% organic vehicle.
[0043] Test Example 1 The topcon front main grid silver paste is tested for paste appearance, number of broken grids, grid line height and width, resistance, tension, and oven tension.
[0044] Topcon busbar slurry production process: Step 1: weigh 16.5% of the organic vehicle of the above-mentioned Examples 1-6 and Comparative Examples 1-3, 82% of the silver powder, and 1.5% of the inorganic glass powder according to mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix them using a centrifuge; Step 3: Put the materials pre-mixed in the centrifuge in step 2 into a constant temperature three-roll grinder, and use the constant temperature three-roll grinder to fully mix and grind to obtain the front main grid silver paste.
[0045] The silver powder is a commercial product, and the inorganic glass powder is homemade. The particle size D50 of the silver powder is 0.76-0.85 μm.
[0046] The above-mentioned front main grid silver paste was printed on an N-type TopCon non-SE blue film, using a 3-pass screen printing screen with a line width of 20 microns. The cell size is 182.20mm*183.75mm. Screen printing, drying and metallization sintering all use production line process parameters. The peak temperature of the belt furnace sintering furnace is 750°C. Performance tests were performed on the embodiments 1-6 and comparative examples 1-3, and the test results are shown in Table 1.
[0047] Table 1. Performance results of silver paste for the front main grid of Topton solar cells, examples 1-6 and comparative examples 1-3:
[0048] From the electrical performance test results of the TopCon cells in Table 1, it can be seen that the silver paste prepared by the topcon solar cell main grid silver paste fine-line printing organic carrier of the present invention has significantly fewer broken grids than the control sample, indicating that the topcon solar cell main grid silver paste fine-line printing organic carrier of the present invention has good printability and can meet the ultra-fine line printing requirements of the cell production line.
[0049] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.
Claims
1. An organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid, characterized in that: The invention comprises the following raw materials in percentage by weight: 60-80% of solvent, 2-8% of thixotropic agent, 2-30% of thickener resin and 1-5% of dispersant; wherein the solvent comprises one or more of butyl carbitol, dodecanol, hexadecanol, butyl carbitol acetate, diethylene glycol monohexyl ether, propylene glycol phenyl ether acetate and dimethyl adipate.
2. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 1, characterized in that: The mass percentage of butyl carbitol is 10% to 50%, the mass percentage of butyl carbitol acetate is 10% to 50%, and the mass percentage of dimethyl adipate is 5% to 45%.
3. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 2, characterized in that: The thickener comprises the following components: cellulose acetate butyrate, ethyl cellulose, polyaldehyde resin, rosin resin, and acrylic resin. Calculated by the mass percentage of the organic carrier, the mass proportion of the cellulose acetate butyrate is 0-4%, the mass proportion of the ethyl cellulose is 0.5-12%, the mass proportion of the acrylic resin is 0.5-8%, and the mass proportion of the polyaldehyde resin is 5%-30%.
4. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 3, characterized in that: The thixotropic agent comprises the following ingredients: hydrogenated castor oil, polyamide wax, fumed silica, and organic bentonite. Calculated by the mass percentage of the organic carrier, the mass proportion of the hydrogenated castor oil is 0.1-2%, the mass proportion of the polyamide wax is 1.5-6%, the mass proportion of the fumed silica is 0.5-3%, and the mass proportion of the organic bentonite is 0.3-2.5%.
5. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 4, characterized in that: The dispersant comprises the following components: castor oil, oleic acid, phosphate, BYK204, and Span 85. Based on the mass of the organic carrier, the mass percentage of the castor oil is 0.5% to 2%, the mass percentage of the oleic acid is 0.1% to 1.5%, the mass percentage of the phosphate is 0 to 2%, the mass percentage of the BYK204 is 0 to 0.5%, and the mass percentage of the Span 85 is 0 to 1.5%.
6. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 5, characterized in that: The Topcon battery front main grid silver paste also includes 78-86% spherical silver powder, 0.6-2.5% glass powder, 10-20% organic carrier, and 0-1% additive.
7. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 6, characterized in that: The method for preparing the front main grid silver paste comprises the following steps: Step 1: weigh 16.5% of organic carrier, 82% of silver powder, and 1.5% of inorganic glass powder by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix them using a centrifuge; Step 3: Put the materials pre-mixed in the centrifuge in step 2 into a constant temperature three-roll grinder, and use the constant temperature three-roll grinder to fully mix and grind to obtain the front main grid silver paste.
8. The organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 7, characterized in that: The silver powder is a commercial product, the inorganic glass powder is homemade, and the particle size D50 of the silver powder is 0.76-0.85 μm.
9. The organic carrier suitable for TopCon solar cell main grid silver paste fine line printing according to claim 7, characterized in that: The front main grid silver paste obtained in step three is printed on an N-type TopCon non-SE blue film for testing, using a 3-line screen printing screen with a line width of 20 microns, a cell size of 182.20 mm*183.75 mm, screen printing, drying and metallization sintering all use production line process parameters, and the peak temperature of the belt furnace sintering furnace is 750°C.
10. The method for preparing an organic carrier suitable for printing fine lines of silver paste for TopCon solar cell main grid according to claim 6, characterized in that: The following steps are involved: Step 1: Weigh 15% butyl carbitol, 40% butyl carbitol acetate, 15% dimethyl adipate, 8% ethyl cellulose, 11% polyaldehyde resin, 3% acrylic resin, 5% polyamide wax, 0.8% organic bentonite, 0.5% fumed silica, 1% oleic acid, and 0.7% castor oil by mass percentage; Step 2: Place the components weighed in step 1 into a centrifuge and pre-mix the components using the centrifuge at a centrifugal speed of 230 r / min for a mixing time of 15 min; Step 3: Place the premixed materials in step 2 into a homogenizing stirring kettle for heating and stirring at 60° C. for 30 minutes to prepare a uniform and transparent solution, that is, to prepare an organic carrier.