An organic carrier for double-sided PERC aluminum paste and its preparation method

Abstract

The present invention discloses an organic carrier for double-sided PERC aluminum paste and a preparation method thereof, belonging to the technical field of solar cells. The organic carrier for double-sided PERC aluminum paste includes an organic binder, a thixotropic agent, and a surface dispersant. The mass ratio of the organic binder, the thixotropic agent, and the surface dispersant is organic binder:thixotropic agent:dispersant = (150 - 200):(1.5 - 3.5):(2.5 - 4.5). By using an organic carrier composed of specific organic binder, thixotropic agent, and surface dispersant, the present invention can balance the two aspects of metallization contact and passivation of double-sided PERC aluminum paste, and at the same time has good printing performance and plasticity, significantly improving important parameters such as the strength of PL corrosion, contact resistance, line resistance, BSF thickness, doping concentration, and passivation film corrosion, significantly improving the efficiency and increasing the double-sided rate.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and particularly relates to an organic carrier for double-sided PERC aluminum paste and a preparation method thereof. Background Art

[0002] Since the advent of PERC technology in the photovoltaic industry, after three to four years of rapid development, the penetration rate of PERC cells has exceeded 70% in 2021. Among them, double-sided PERC technology has become the mainstream of PERC. The efficiency improvement brought by double-sided PERC is mainly manifested in the improvement of the paste. Double-sided PERC aluminum paste can support the printing of grid patterns, minimize the back contact area to the greatest extent, and maintain a low volume resistance. While ensuring the front efficiency as much as possible, the double-sided rate has been greatly improved. According to statistics, double-sided PERC cells can bring a 10 - 25% power generation gain with almost no increase in cost.

[0003] However, with technological innovation and product upgrading, high-efficiency solar cells such as HJT and TOPCon have challenged the leading position of double-sided PERC cells. Currently, the efficiency of double-sided PERC cells on the production line is about 23.0% - 23.4%, the efficiency of TOPCon cells is about 24%, and the efficiency of HJT cells is about 24.5%. At the same time, the theoretical limit efficiency of PERC technology is 24.5%, which is far lower than 27.5% of HJT and 28.7% of TOPCon. Although TOPCon and HJT technologies are limited by cost issues and cannot be fully spread, the absolute advantage in efficiency restricts the application of double-sided PERC technology. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an organic carrier for double-sided PERC aluminum paste and a preparation method thereof. The organic carrier can effectively balance the fluidity and thixotropy of double-sided PERC aluminum paste, enabling the aluminum paste to adapt to various production process conditions.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] An organic carrier for double-sided PERC aluminum paste, comprising an organic binder, a thixotropic agent, and a surface dispersant. The mass ratio of the organic binder, thixotropic agent, and surface dispersant is organic binder : thixotropic agent : dispersant = (150 - 200) : (1.5 - 3.5) : (2.5 - 4.5).

[0007] The inventor of the present invention found in a large number of studies that the organic carrier obtained by the above specific ratio of organic binder, thixotropic agent, and surface dispersant can effectively balance the fluidity and thixotropy of double-sided PERC aluminum paste, enabling the aluminum paste to adapt to various production process conditions.

[0008] As a preferred embodiment of the present invention, the organic binder comprises an organic resin and an organic solvent, and the mass ratio of the organic resin to the organic solvent is organic resin: organic solvent = (10 - 50): (90 - 150).

[0009] When the resin and the organic solvent are combined according to the above mass ratio, the fluidity and thixotropy of the double-sided PERC aluminum paste can be balanced.

[0010] As a preferred embodiment of the present invention, the organic resin is at least one of styrene maleic anhydride resin, modified acrylic resin, modified butyl acetate cellulose, ethyl cellulose, and polyvinyl butyral.

[0011] As a preferred embodiment of the present invention, the organic resin comprises styrene maleic anhydride resin, modified acrylic resin, and modified butyl acetate cellulose, and the mass ratio of styrene maleic anhydride resin: modified acrylic resin: modified butyl acetate cellulose = (1 - 3): (2 - 6): (1 - 4).

[0012] As a preferred embodiment of the present invention, the organic resin comprises styrene maleic anhydride resin and one or more of modified acrylic resin, modified butyl acetate cellulose, ethyl cellulose, and polyvinyl butyral.

[0013] As a preferred embodiment of the present invention, the organic solvent is at least one of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol dibenzoate, alcohol ester 16, dimethyl adipate, dimethyl nylonate, and ethylene glycol phenyl ether.

[0014] The inventors of the present invention have found that when the organic resin and the organic solvent adopt the above raw materials, the two aspects of metallization contact and passivation of the double-sided PERC aluminum paste can be well balanced, and at the same time, it has good printing performance and plasticity, so that important parameters such as PL corrosion strength, contact resistance, line resistance, BSF thickness, doping concentration, and passivation film corrosion have been significantly improved, the efficiency has been significantly increased, and the double-sided rate has been increased.

[0015] As a preferred embodiment of the present invention, the organic solvent comprises butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of butyl carbitol: diethylene glycol dibutyl ether: diethylene glycol diethyl ether: diethylene glycol dibenzoate = (2 - 6): (0.5 - 2): (2 - 5): (1 - 4).

[0016] In a large number of studies, the inventors of the present invention found that, in particular, the organic resin composed of styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate in a specific mass ratio and the organic binders of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate in a specific mass ratio have better dispersion and wetting properties for the aluminum paste, endowing the aluminum paste with better thixotropic properties, improving plasticity, and at the same time making the aluminum paste have smaller line resistance and less corrosion, significantly increasing the open-circuit voltage, thereby improving the front efficiency and bifacial ratio of the bifacial PERC aluminum paste.

[0017] When the types or mass parts of the organic resin and / or organic solvents change, it will lead to ineffective balance of metallization contact and passivation of the bifacial PERC aluminum paste, thus reducing the efficiency.

[0018] As a preferred embodiment of the present invention, the organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate, and the mass ratio of styrene maleic anhydride resin: modified acrylic resin: modified cellulose acetate butyrate is styrene maleic anhydride resin: modified acrylic resin: modified cellulose acetate butyrate = 2:5:3.

[0019] As a preferred embodiment of the present invention, the organic solvents include butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of butyl carbitol: diethylene glycol dibutyl ether: diethylene glycol diethyl ether: diethylene glycol dibenzoate is butyl carbitol: diethylene glycol dibutyl ether: diethylene glycol diethyl ether: diethylene glycol dibenzoate = 4:1:3:2.

[0020] Especially when the organic resin and organic solvents are combined according to the above mass ratio, the aluminum paste can have the smallest line resistance and less corrosion, more significantly increase the open-circuit voltage, and significantly improve important parameters such as contact resistance, line resistance, BSF thickness, doping concentration, and passivation film corrosion, thereby more significantly improving the front efficiency and bifacial ratio of the bifacial PERC aluminum paste.

[0021] As a preferred embodiment of the present invention, the thixotropic agent is at least one of polyurea thixotropic agents and fumed silica.

[0022] As a preferred embodiment of the present invention, the dispersant is at least one of polypropylene maleic anhydride grafted compounds, phosphate ester dispersants, fatty acid dispersants, and dimethyl silicone oil.

[0023] The present invention also provides a preparation method of an organic carrier for bifacial PERC aluminum paste, comprising the following steps:

[0024] Add an organic solvent into a reaction kettle, heat the jacket of the reaction kettle with heat-conducting oil to make the temperature inside the kettle 60 - 100 °C, and keep stirring at a speed of 400 - 600 rpm for 0.2 - 1 h;

[0025] Add an organic resin, adjust the temperature of the heat-conducting oil to make the temperature inside the kettle 100 - 140 °C, and keep stirring at a speed of 600 - 1000 rpm for 0.5 - 2 h,

[0026] Adjust the temperature of the heat-conducting oil to make the temperature inside the kettle 50 - 55 °C, then add a thixotropic agent and a dispersant, keep warm for 0.2 - 1 h, and discharge to obtain an organic carrier for double-sided PERC aluminum paste.

[0027] It should be noted that in the present invention, by adjusting the temperature of the heat-conducting oil, the temperature inside the kettle can reach the corresponding temperature value.

[0028] The beneficial effects of the present invention are as follows: with an organic binder, a thixotropic agent, and a surface dispersant with specific compositions as the organic carrier, the present invention can balance the two aspects of metallization contact and passivation of double-sided PERC aluminum paste, and at the same time has good printing performance and plasticity, significantly improving important parameters such as PL corrosion strength, contact resistance, line resistance, BSF thickness, doping concentration, and passivation film corrosion, significantly improving the efficiency and increasing the double-sided rate. Description of the Drawings

[0029] Figure 1 The printing diagram of the aluminum paste prepared with the organic carrier described in Example 1 in the PERC cell area.

[0030] Figure 2 The printing diagram of the aluminum paste prepared with the organic carrier described in Example 2 in the PERC cell area.

[0031] Figure 3 The printing diagram of the aluminum paste prepared with the organic carrier described in Comparative Example 1 in the PERC cell area.

[0032] Figure 4 The printing diagram of the aluminum paste prepared with the organic carrier described in Comparative Example 2 in the PERC cell area. Detailed Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0034] In the present invention, unless otherwise specified, the parts mentioned are all parts by mass.

[0035] Unless otherwise specified, the reagents or instruments used in the present invention are all conventional products that can be obtained through commercial purchase. The raw material information used in the examples and comparative examples of the present invention is as follows:

[0036] The styrene maleic anhydride resin was purchased from Shenzhen Past New Material Technology Co., Ltd., model: Plas-EasyTM A1058.

[0037] The modified acrylic resin was purchased from Shanghai Bolier Chemical Co., Ltd., model: BM99.

[0038] The modified cellulose acetate butyrate was purchased from Eastman Chemical Company, model: CAB-381-20.

[0039] The polyvinyl butyral was purchased from, model: B16H.

[0040] The maleic anhydride grafted polypropylene was purchased from, model: POE grafted GMA.

[0041] The phosphate ester dispersant was purchased from DISPARLON, model: DA-234.

[0042] The preparation methods of the organic carriers for double-sided PERC aluminum paste described in the examples and comparative examples all include the following steps:

[0043] Add the organic solvent into Figure 1 the reaction kettle. The jacket of the reaction kettle is heated with heat transfer oil to make the temperature in the kettle 80 °C, and keep stirring at a speed of 200 rpm for 0.5 h;

[0044] Add the organic resin, and adjust the temperature of the heat transfer oil to make the temperature in the kettle 120 °C, and keep stirring at a speed of 800 rpm for 1 h,

[0045] Adjust the temperature of the heat transfer oil to make the temperature in the kettle 53.5 °C, then add the thixotropic agent and the dispersant, keep warm for 0.5 h, and discharge to obtain the organic carrier for double-sided PERC aluminum paste.

[0046] Example 1

[0047] An organic carrier for double-sided PERC aluminum paste, comprising: 171 parts by mass of an organic binder, 2.4 parts by mass of a thixotropic agent, and 3.3 parts by mass of a surface dispersant.

[0048] The organic binder includes an organic resin and an organic solvent, and the mass ratio of the organic resin to the organic solvent is 21:150.

[0049] The organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate, and the mass ratio of the styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate is 2:5:3.

[0050] The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of the butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is 4:1:3:2.

[0051] The thixotropic agent includes polyamide wax and fumed silica, and the mass ratio of the polyamide wax and fumed silica is 1.1:0.5.

[0052] The dispersant includes maleic anhydride grafted polypropylene and phosphate ester dispersant, and the mass ratio of the maleic anhydride grafted polypropylene and phosphate ester dispersant is 0.5:1.7.

[0053] Example 2

[0054] An organic carrier for double-sided PERC aluminum paste includes: 171 parts by mass of an organic binder, 2.4 parts by mass of a thixotropic agent, and 2.55 parts by mass of a surface dispersant.

[0055] The organic binder includes an organic resin and an organic solvent, and the mass ratio of the organic resin and the organic solvent is 21:150.

[0056] The organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate, and the mass ratio of the styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate is 2:5:3.

[0057] The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of the butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is 4:1:3:2.

[0058] The thixotropic agent includes polyamide wax and fumed silica, and the mass ratio of the polyamide wax and fumed silica is 1.1:0.5.

[0059] The dispersant is a phosphate ester dispersant.

[0060] Example 3

[0061] An organic carrier for double-sided PERC aluminum paste includes: 150 parts by mass of an organic binder, 1.5 parts by mass of a thixotropic agent, and 4.5 parts by mass of a surface dispersant.

[0062] The organic binder includes an organic resin and an organic solvent, and the mass ratio of the organic resin to the organic solvent is 50:100.

[0063] The organic resin includes a styrene maleic anhydride resin, a modified acrylic resin, and a modified butyl cellulose acetate. The mass ratio of the styrene maleic anhydride resin, the modified acrylic resin, and the modified butyl cellulose acetate is styrene maleic anhydride resin:modified acrylic resin:modified butyl cellulose acetate = 3:3:4.

[0064] The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate. The mass ratio of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is 6:1:2:1.

[0065] The thixotropic agent includes polyamide wax and fumed silica, and the mass ratio of polyamide wax to fumed silica is 1.1:0.5.

[0066] The dispersant includes maleic anhydride grafted polypropylene and a phosphate ester dispersant, and the mass ratio of maleic anhydride grafted polypropylene to the phosphate ester dispersant is 0.5:1.7.

[0067] Example 4

[0068] An organic carrier for double-sided PERC aluminum paste includes: 200 parts by mass of an organic binder, 3.5 parts by mass of a thixotropic agent, and 2.5 parts by mass of a surface dispersant.

[0069] The organic binder includes an organic resin and an organic solvent, and the mass ratio of the organic resin to the organic solvent is 50:150.

[0070] The organic resin includes a styrene maleic anhydride resin, a modified acrylic resin, and a modified butyl cellulose acetate. The mass ratio of the styrene maleic anhydride resin, the modified acrylic resin, and the modified butyl cellulose acetate is styrene maleic anhydride resin:modified acrylic resin:modified butyl cellulose acetate = 1:6:3.

[0071] The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate. The mass ratio of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is 2:2:2:4.

[0072] The thixotropic agent includes polyamide wax and fumed silica, and the mass ratio of polyamide wax to fumed silica is 1.1:0.5.

[0073] The dispersant includes maleic anhydride grafted polypropylene and phosphate ester dispersant, and the mass ratio of maleic anhydride grafted polypropylene to phosphate ester dispersant is 0.5:1.7.

[0074] Example 5

[0075] The difference between Example 5 and Example 1 is that the selected organic resin in Example 5 is different from that in Example 1, and the others are the same.

[0076] The organic resin includes styrene maleic anhydride resin, polyvinyl butyral, and ethyl cellulose, and the mass ratio of styrene maleic anhydride resin, polyvinyl butyral, and ethyl cellulose is 2:5:3.

[0077] Example 6

[0078] The difference between Example 6 and Example 1 is that the organic solvent in Example 6 is different from that in Example 1, and the others are the same.

[0079] The organic solvent includes dimethyl adipate, dimethyl nylonate, ethylene glycol phenyl ether, and diethylene glycol dibenzoate, and the mass ratio of dimethyl adipate, dimethyl nylonate, ethylene glycol phenyl ether, and diethylene glycol dibenzoate is 4:1:3:2.

[0080] Comparative Example 1

[0081] The difference between Comparative Example 1 and Example 2 is that the mass ratio of styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate in the organic resin described in Comparative Example 2 is different from that in Example 2 and is not within the scope defined in the present invention, and the others are the same.

[0082] The organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate, and the mass ratio of styrene maleic anhydride resin, modified acrylic resin, and modified cellulose acetate butyrate is 4:1:5.

[0083] Comparative Example 2

[0084] The difference between Comparative Example 2 and Example 2 is that the mass ratio of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate in the organic solvent described in Comparative Example 2 is different from that in Example 2.

[0085] The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is 1:4:0.5:4.5.

[0086] Comparative Example 3

[0087] The difference between Comparative Example 3 and Example 2 lies in that the selection of the organic resin in Comparative Example 3 is different from that in Example 2, and the others are the same.

[0088] The organic resin includes polyvinyl butyral, epoxy resin, and diethylene glycol monobutyl ether acetate, and the mass ratio of polyvinyl butyral, epoxy resin, and diethylene glycol monobutyl ether acetate is 2:5:3.

[0089] Comparative Example 4

[0090] The difference between Comparative Example 4 and Example 2 lies in that the selection of the organic solvent in Comparative Example 4 is different from that in Example 2, and the others are the same.

[0091] The organic solvent includes tributyl acetylcitrate, diethylene glycol dibutyl ether, butyl carbitol acetate, and propylene glycol phenyl ether, and the mass ratio of tributyl acetylcitrate, diethylene glycol dibutyl ether, butyl carbitol acetate, and propylene glycol phenyl ether is 4:1:3:2.

[0092] Test Example

[0093] Using the same aluminum powder and glass powder, according to the following mass percentages: 78% aluminum powder, 2% glass powder, 20% organic carrier, the organic carriers described in Examples 1-6 and Comparative Examples 1-4 above were combined to form aluminum paste for testing.

[0094] 1. The aluminum pastes described in Examples 1-2 and Comparative Examples 1-2 were printed in the area of the PERC cell, and the printing performance and plasticity are respectively as Figures 1 to 4 shown. It can be seen from Figures 1 - 4 that there is no virtual printing in Examples 1 and 2, there is slight virtual printing in the middle of Comparative Example 2, and there is serious virtual printing in the middle and edges of Comparative Example 1.

[0095] 2. The aluminum pastes described in Examples 1-6 and Comparative Examples 1-4 were printed in the area of the PERC cell, and the printing performance, open circuit voltage, and double-sided rate of the aluminum paste were detected. The test results are shown in Tables 1 and 2.

[0096] Table 1

[0097]

[0098]

[0099] Table 2

[0100] Counting Eta Voc Isc FF Rsh RS Double-sided ratio Example 1 3000 23.501 0.6855 11.344 83.14 563.3 1.26 75.8 Example 2 3010 23.498 0.6853 11.344 83.11 560.1 1.27 75.6 Example 3 3294 23.487 0.6848 11.333 83.04 559.5 1.30 74.2 Example 4 3315 23.486 0.6849 11.336 83.09 559.4 1.29 74.0 Example 5 3084 23.479 0.6849 11.335 83.06 558.3 1.31 74.1 Example 6 3116 23.485 0.6848 11.334 83.07 558.1 1.30 73.9 Comparative Example 1 3288 23.468 0.6842 11.323 82.94 539.5 1.33 73.7 Comparative Example 2 3119 23.463 0.6843 11.326 82.90 539.4 1.39 73.0 Comparative Example 3 3275 23.465 0.6842 11.325 82.94 538.7 1.36 73.2 Comparative Example 4 3135 23.466 0.6843 11.324 82.92 539.1 1.39 73.6

[0101] As can be seen from Table 1 and Table 2, the aluminum paste prepared from the organic carrier prepared by the present invention not only has a narrow line width and the highest double-sided rate, but also has a small line resistance, less corrosion at the laser grooving of the battery chip, and good contact. Therefore, the open-circuit voltage is increased, the FF is larger, and the efficiency is the highest.

[0102] Comparing Examples 1 to 6, it can be seen that the selection of different organic carriers, organic solvents and different raw material ratios can affect the performance of the prepared organic carrier to a certain extent. Among them, Example 1 is the best implementation mode with the best performance.

[0103] Comparing Example 2 with Comparative Examples 1 to 4, it can be seen that when the mass ratio of the organic solvent and the organic resin and the selection of the organic solvent and the organic resin are not within the scope of the present invention, it will lead to a significant decrease in efficiency, line width, line resistance, contact resistivity, corrosion, etc.

[0104] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An organic carrier for double-sided PERC aluminum paste, characterized in that, It includes an organic binder, a thixotropic agent, and a surface dispersant, and the mass ratio of the organic binder, thixotropic agent, and surface dispersant is organic binder:thixotropic agent:surface dispersant = (150 - 200):(1.5 - 3.5):(2.5 - 4.5); The organic binder includes an organic resin and an organic solvent, and the mass ratio of the organic resin and organic solvent is organic resin:organic solvent = (10 - 50):(90 - 150); The organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified butyl acetate cellulose, and the mass ratio of the styrene maleic anhydride resin, modified acrylic resin, and modified butyl acetate cellulose is styrene maleic anhydride resin:modified acrylic resin:modified butyl acetate cellulose = (1 - 3):(2 - 6):(1 - 4); The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of the butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is butyl carbitol:diethylene glycol dibutyl ether:diethylene glycol diethyl ether:diethylene glycol dibenzoate = (2 - 6):(0.5 - 2):(2 - 5):(1 - 4).

2. The organic carrier for double-sided PERC aluminum paste according to claim 1, characterized in that, The organic resin includes styrene maleic anhydride resin, modified acrylic resin, and modified butyl acetate cellulose, and the mass ratio of the styrene maleic anhydride resin, modified acrylic resin, and modified butyl acetate cellulose is styrene maleic anhydride resin:modified acrylic resin:modified butyl acetate cellulose = 2:5:3; The organic solvent includes butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate, and the mass ratio of the butyl carbitol, diethylene glycol dibutyl ether, diethylene glycol diethyl ether, and diethylene glycol dibenzoate is butyl carbitol:diethylene glycol dibutyl ether:diethylene glycol diethyl ether:diethylene glycol dibenzoate = 4:1:3:

2.

3. The organic carrier for double-sided PERC aluminum paste according to claim 1, characterized in that, The thixotropic agent is at least one of polyurea thixotropic agents and fumed silica.

4. The organic carrier for double-sided PERC aluminum paste according to claim 1, characterized in that, The surface dispersant is at least one of polypropylene maleic anhydride grafted compounds, phosphate ester dispersants, fatty acid dispersants, and dimethyl silicone oil.

5. A preparation method of the organic carrier for double-sided PERC aluminum paste according to any one of claims 1 to 4, characterized in that, It includes the following steps: Add the organic solvent into the reaction kettle, heat the jacket of the reaction kettle with heat transfer oil to make the temperature in the kettle 60 - 100 °C, and keep stirring at a speed of 400 - 600 rpm for 0.2 - 1 h; Add the organic resin, adjust the temperature of the heat transfer oil to make the temperature in the kettle 100 - 140 °C, and keep stirring at a speed of 600 - 1000 rpm for 0.5 - 2 h, Adjust the temperature of the heat transfer oil to make the temperature in the kettle 50 - 55 °C, then add the thixotropic agent and the surface dispersant, keep warm for 0.2 - 1 h, and discharge the material to obtain the organic carrier for double-sided PERC aluminum paste.

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