Acetic acid resistant conductive paste, front electrode and solar cell

Abstract

The invention relates to acetic acid-resistant conductive paste, a front electrode and a solar cell. The acetic acid-resistant conductive paste comprises the following components in percentage by mass: 0%-1% of aluminum powder, 1%-5% of special glass powder, 85%-90% of silver powder and 5%-10% of an organic carrier, the special glass powder comprises the following components in percentage by mass: 35%-75% of lead oxide, 5%-25% of boric oxide, 1%-40% of silicon dioxide, 1%-10% of titanium oxide, 0%-8% of zinc oxide, 1%-10% of aluminum oxide, 0%-5% of bismuth oxide and 0%-5% of magnesium oxide. An electrode formed by the acetic acid-resistant conductive paste can achieve high photoelectric conversion efficiency, meanwhile, the acetic acid corrosion can be effectively resisted, the performance of a solar cell is improved, and the acetic acid-resistant conductive paste is particularly suitable for a TOPCON cell technology.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an acetic acid-resistant conductive paste, a front electrode and a solar cell. Background Art

[0002] With the development of human energy application technology, fossil energy will gradually be replaced by renewable energy due to its non-renewable nature and air pollution problems. Among renewable energy sources, solar power generation technology has received particular attention and has achieved leapfrog development. As the main body of solar power generation technology, crystalline silicon solar cell technology has always attracted people's attention, and its photoelectric conversion efficiency has also been continuously improved.

[0003] The quality of solar cells depends not only on the carrier concentration, distribution and mobility of the crystalline silicon material used, but also on the performance of the positive and negative electrodes of the battery. The front electrode directly affects parameters such as series resistance, shunt resistance, fill factor and photoelectric conversion efficiency. Therefore, the quality of the conductive paste of the front electrode is also one of the factors that determine the performance of solar cells. At the same time, as an energy product that needs to work for a long time, the reliability of solar cells is also particularly important. In the current component packaging process, ethylene-vinyl acetate copolymer (EVA) film is required as the main packaging material. When the EVA packaging material is exposed to high temperature and high humidity natural conditions for a long time, under the combined action of water vapor and sunlight, EVA will partially decompose to produce acetic acid, corrode the battery electrodes, reduce the photoelectric conversion efficiency of the component, and affect the service life of the component. In recent years, many solar cell manufacturers have put forward requirements for conductive pastes to be resistant to acetic acid to reduce efficiency attenuation.

[0004] In addition, TOPCON (tunneling oxide passivation) battery technology has gradually become the mainstream process for high-efficiency batteries. Unlike traditional PERC (back passivation) batteries, TOPCON is mainly made of N-type silicon wafers, so its front conductive paste uses silver-aluminum paste, and the presence of aluminum also greatly reduces the conductive paste's resistance to acetic acid. At the same time, in the current TOPCON battery process, a laser induced process is introduced. This process requires that during high-temperature sintering, the conductive paste corrodes the SiN anti-reflection and anti-transmittance layer as little as possible to achieve the purpose of reducing carrier surface recombination and increasing the battery open circuit voltage. However, this requires reducing the content of glass powder in the paste, and the reduction of glass powder content also affects the paste's resistance to acetic acid corrosion. Summary of the invention

[0005] Based on this, the present application provides an acetic acid resistant conductive paste, a front electrode and a solar cell. The electrode formed by the acetic acid resistant conductive paste can achieve a high photoelectric conversion efficiency, and can also effectively resist acetic acid corrosion, improve the performance of solar cells, and is particularly suitable for TOPCON cell technology.

[0006] In a first aspect of the present application, an acetic acid-resistant conductive paste is provided, comprising the following components by mass percentage:

[0007] Aluminum powder 0%~1%

[0008] Special glass powder 1%~5%

[0009] Silver powder 85%~90%

[0010] Organic carrier 5%~10%;

[0011] The special glass powder comprises the following components in percentage by mass:

[0012] Lead oxide 35%~75%

[0013] Boron oxide 5%~25%

[0014] Silicon dioxide 1%~40%

[0015] Titanium oxide 1%~10%

[0016] Zinc oxide 0%~8%

[0017] Alumina 1%~10%

[0018] Bismuth oxide 0%~5%

[0019] Magnesium oxide 0%~5%.

[0020] In one embodiment, the mass percentage of each component in the special glass powder is as follows:

[0021] Lead oxide 35%~75%

[0022] Boron oxide 5%~25%

[0023] Silicon dioxide 1%~40%

[0024] Titanium oxide 2%~10%

[0025] Zinc oxide 0%~8%

[0026] Alumina 1%~10%

[0027] Bismuth oxide 0%~5%

[0028] Magnesium oxide 0%~2.5%.

[0029] In one embodiment, the acetic acid resistant conductive paste comprises the following components by mass percentage:

[0030] Aluminum powder 0%

[0031] Special glass powder 1%~5%

[0032] Silver powder 85%~90%

[0033] Organic carrier 5%~10%;

[0034] The special glass powder comprises the following components in percentage by mass:

[0035] Lead oxide 63%~72%

[0036] Boron oxide 8%~11%

[0037] Silicon dioxide 3%~8%

[0038] Titanium oxide 2%~8%

[0039] Zinc oxide 0%~4%

[0040] Alumina 2%~8%

[0041] Bismuth oxide 0%~5%

[0042] Magnesium oxide 0%~2%.

[0043] In one embodiment, the acetic acid resistant conductive paste comprises the following components by mass percentage:

[0044] Aluminum powder 0.1%~0.5%

[0045] Special glass powder 1%~5%

[0046] Silver powder 85%~90%

[0047] Organic carrier 5%~10%;

[0048] The special glass powder comprises the following components in percentage by mass:

[0049] Lead oxide 45%~50%

[0050] Boron oxide 22%~23%

[0051] Silicon dioxide 10%~15%

[0052] Titanium oxide 2%~4%

[0053] Zinc oxide 4%~5%

[0054] Alumina 6%~8%

[0055] Bismuth oxide 1%~2.5%

[0056] Magnesium oxide 1%~2%.

[0057] In one embodiment, the method for preparing the special glass powder comprises the following steps:

[0058] Weighing raw materials according to the components of the special glass powder, mixing and then melting them, the melting treatment conditions include 800° C. to 1500° C., and keeping the temperature for 0.5 h to 1 h;

[0059] The molten glass slurry is poured into water for quenching, and then ball-milled and sieved.

[0060] In one embodiment, the silver powder has a purity of 99.9% to 99.999% and an average particle size of 1 μm to 8 μm, and optionally, an average particle size of 1 μm to 3 μm; and / or

[0061] The aluminum powder has a purity of 99.9% to 99.999% and an average particle size of 0.5 μm to 10 μm, and optionally, an average particle size of 1 μm to 5 μm.

[0062] In one embodiment, the organic carrier includes a resin and an organic solvent; wherein the resin includes one or more of ethyl cellulose resin, rosin resin and acrylic resin; the organic solvent includes one or more of propylene glycol butyl ether acetate, butyl carbitol, ethylene glycol monobutyl ether acetate and petroleum ether; optionally, it also includes one or both of a plasticizer and a surfactant.

[0063] A second aspect of the present application provides a front electrode, comprising a pole piece substrate and a conductive layer disposed on the pole piece substrate, wherein the conductive layer is formed by film-forming the acetic acid-resistant conductive paste described in the first aspect.

[0064] A third aspect of the present application provides a solar cell, comprising the front electrode described in the second aspect.

[0065] In one embodiment, the solar cell is a tunnel oxide passivation solar cell.

[0066] This application uses a special glass powder of the Pb-Si-B-Ti glass system on the basis of reasonable matching of various components, and controls the content of titanium oxide. When the conductive paste obtained in this way is applied to the front electrode, it can form a dense protective layer, effectively resisting the corrosion of acetic acid, thereby improving the overall acetic acid resistance of solar cells, and is particularly suitable for TOPCON cell technology that requires the use of aluminum-containing conductive paste. At the same time, the above-mentioned acetic acid-resistant conductive paste maintains moderate corrosion to SiN anti-reflection film on the basis of a high glass powder content, and can cooperate with laser induction to reduce surface carrier recombination, increase open circuit voltage, and thus improve the photoelectric conversion efficiency of solar cells. DETAILED DESCRIPTION

[0067] The acetic acid resistant conductive paste, front electrode and solar cell of the present application are further described in detail below in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0069] The optional scope of the terms "and / or", "or / and", and "and / or" used in this article includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, said any and all combinations include any combination of any two related listed items, any more related listed items, or all related listed items.

[0070] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0071] In this application, "first aspect", "second aspect", "third aspect", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0072] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0073] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0074] The percentage contents involved in this application, unless otherwise specified, refer to mass percentage for solid-liquid mixing and solid-solid mixing, and refer to volume percentage for liquid-liquid mixing.

[0075] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0076] The temperature parameters in this application, unless otherwise specified, allow for both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows the temperature to fluctuate within the accuracy range of instrument control.

[0077] The room temperature in this application generally refers to 4°C~30°C, preferably 20±5°C.

[0078] Traditional conductive pastes are difficult to balance between acetic acid resistance and photoelectric conversion efficiency. They are often highly efficient but poorly resistant to acetic acid, while those with strong acetic acid resistance have low efficiency. Based on this, the present application improves the composition of the glass powder and introduces an appropriate amount of titanium oxide under the condition of reasonable matching of the components, which can better solve this problem and enable the conductive paste to have good acetic acid resistance while achieving high photoelectric conversion efficiency.

[0079] Some examples of the present application provide an acetic acid resistant conductive paste, which includes the following components by mass percentage:

[0080] Aluminum powder 0%~1%

[0081] Special glass powder 1%~5%

[0082] Silver powder 85%~90%

[0083] Organic carrier 5%~10%;

[0084] The special glass powder comprises the following components in percentage by mass:

[0085] Lead oxide 35%~75%

[0086] Boron oxide 5%~25%

[0087] Silicon dioxide 1%~40%

[0088] Titanium oxide 1%~10%

[0089] Zinc oxide 0%~8%

[0090] Alumina 1%~10%

[0091] Bismuth oxide 0%~5%

[0092] Magnesium oxide 0%~5%.

[0093] Specifically, in the acetic acid resistant conductive paste, the mass percentage of aluminum powder includes but is not limited to: 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or a range between any two of the foregoing.

[0094] Specifically, in the acetic acid resistant conductive paste, the mass percentage of special glass powder includes but is not limited to: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% or a range between any two of the foregoing.

[0095] Specifically, in the acetic acid resistant conductive paste, the mass percentage of silver powder includes but is not limited to: 85%, 85.5%, 86%, 86.5%, 87%, 87.5%, 88%, 88.5%, 89%, 89.5%, 90% or a range between any two of the foregoing.

[0096] Specifically, in the acetic acid-resistant conductive paste, the mass percentage of the organic carrier includes, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10% or a range between any two of the foregoing.

[0097] Specifically, the mass percentage of lead oxide in the special glass powder includes but is not limited to: 35%, 40%, 45%, 47%, 50%, 55%, 60%, 62%, 63%, 65%, 70%, 72%, 75% or a range between any two of the foregoing.

[0098] Specifically, in the special glass powder, the mass percentage of boron oxide includes but is not limited to: 5%, 8%, 10%, 11%, 12%, 15%, 17%, 20%, 23%, 25% or a range between any two of the foregoing.

[0099] Specifically, the mass percentage of silicon dioxide in the special glass powder includes but is not limited to: 1%, 3%, 4%, 5%, 8%, 12%, 15%, 20%, 25%, 30%, 35%, 40% or a range between any two of the foregoing.

[0100] Specifically, the mass percentage of titanium oxide in the special glass powder includes but is not limited to: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10% or a range between any two of the foregoing.

[0101] Specifically, the mass percentage of zinc oxide in the special glass powder includes but is not limited to: 0%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8% or a range between any two of the foregoing.

[0102] Specifically, in the special glass powder, the mass percentage of aluminum oxide includes but is not limited to: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10% or a range between any two of the foregoing.

[0103] Specifically, in the special glass powder, the mass percentage of bismuth oxide includes but is not limited to: 0%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% or a range between any two of the foregoing.

[0104] Specifically, in the special glass powder, the mass percentage of magnesium oxide includes but is not limited to: 0%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% or a range between any two of the foregoing.

[0105] Furthermore, by rationally controlling the mass percentage of each component in the special glass powder, higher photoelectric conversion efficiency and acetic acid resistance can be obtained.

[0106] In some of the examples, the mass percentages of the components in the special glass powder are as follows:

[0107] Lead oxide 35%~75%

[0108] Boron oxide 5%~25%

[0109] Silicon dioxide 1%~40%

[0110] Titanium oxide 2%~10%

[0111] Zinc oxide 0%~8%

[0112] Alumina 1%~10%

[0113] Bismuth oxide 0%~5%

[0114] Magnesium oxide 0%~2.5%.

[0115] Furthermore, for the conductive paste not containing aluminum powder, the mass percentage of each component in the special glass powder can be reasonably controlled according to the following scheme to obtain higher photoelectric conversion efficiency and acetic acid resistance.

[0116] In some examples, the acetic acid resistant conductive paste includes the following components by mass percentage:

[0117] Aluminum powder 0%

[0118] Special glass powder 1%~5%

[0119] Silver powder 85%~90%

[0120] Organic carrier 5%~10%;

[0121] The special glass powder comprises the following components in percentage by mass:

[0122] Lead oxide 63%~72%

[0123] Boron oxide 8%~11%

[0124] Silicon dioxide 3%~8%

[0125] Titanium oxide 2%~8%

[0126] Zinc oxide 0%~4%

[0127] Alumina 2%~8%

[0128] Bismuth oxide 0%~5%

[0129] Magnesium oxide 0%~2%.

[0130] Furthermore, for the conductive paste containing aluminum powder, it is difficult to improve its acetic acid resistance than the conductive paste without aluminum powder. By reasonably controlling the mass percentage of each component in the special glass powder according to the following scheme, higher photoelectric conversion efficiency and acetic acid resistance can be obtained.

[0131] In some examples, the acetic acid resistant conductive paste includes the following components by mass percentage:

[0132] Aluminum powder 0.1%~0.5%

[0133] Special glass powder 1%~5%

[0134] Silver powder 85%~90%

[0135] Organic carrier 5%~10%;

[0136] The special glass powder comprises the following components in percentage by mass:

[0137] Lead oxide 45%~50%

[0138] Boron oxide 22%~23%

[0139] Silicon dioxide 10%~15%

[0140] Titanium oxide 2%~4%

[0141] Zinc oxide 4%~5%

[0142] Alumina 6%~8%

[0143] Bismuth oxide 1%~2.5%

[0144] Magnesium oxide 1%~2%.

[0145] In some examples, the method for preparing the special glass powder includes the following steps:

[0146] Weighing raw materials according to the components of the special glass powder, mixing and then melting them, the melting treatment conditions include 800° C. to 1500° C., and keeping the temperature for 0.5 h to 1 h;

[0147] The molten glass slurry is poured into water for quenching, and then ball-milled and sieved.

[0148] Without limitation, ball milling refers to ball milling until the average particle size of the glass powder is 0.5 μm to 2 μm; sieving refers to sieving through a 325-mesh to 400-mesh sieve.

[0149] In some examples, the silver powder has a purity of 99.9% to 99.999% and an average particle size of 1 μm to 8 μm. Further, the average particle size of the silver powder is 1 μm to 3 μm. There is no specific requirement for the morphology of the silver powder, which can be spherical or flaky, and the preferred morphology is spherical or nearly spherical.

[0150] In some examples, the purity of the aluminum powder is 99.9% to 99.999%, the average particle size is 0.5 μm to 10 μm, and further, the average particle size of the aluminum powder is 1 μm to 5 μm. There is no specific requirement for the morphology of the aluminum powder, which can be spherical or flaky, and the preferred morphology is spherical or nearly spherical.

[0151] In some examples, the organic vehicle includes a resin and an organic solvent, and optionally, further includes one or both of a plasticizer and a surfactant.

[0152] Without limitation, the resin includes one or more of ethyl cellulose resin, rosin resin and acrylic resin. In some examples, the resin includes ethyl cellulose resin, rosin resin and acrylic resin in a mass ratio of (10-15): (2-8): (2-15).

[0153] Without limitation, the organic solvent includes one or more of propylene glycol butyl ether acetate, butyl carbitol, ethylene glycol monobutyl ether acetate and petroleum ether.

[0154] In addition, without limitation, the conductive paste can be prepared according to conventional methods in the art.

[0155] Some other examples of the present application provide a front electrode, including a pole piece substrate and a conductive layer disposed on the pole piece substrate, wherein the conductive layer is formed by film-forming the acetic acid-resistant conductive paste described in the first aspect. Further, the conductive layer is prepared by sintering and laser processing the acetic acid-resistant conductive paste described above.

[0156] Some other examples of the present application provide a solar cell, comprising the front electrode as described above. Further, the solar cell is a tunneling oxide layer passivation solar cell.

[0157] For experimental parameters not specified in the following specific embodiments, reference is made to the instructions given in the present application document, and reference may also be made to experimental manuals in the art or other experimental methods known in the art, or to experimental conditions recommended by manufacturers.

[0158] The raw materials and reagents involved in the following specific examples can be obtained from commercial sources, or can be prepared by those skilled in the art according to known methods.

[0159] The silver powder used in the embodiment has an average particle size of 1 μm to 2 μm, a purity of 99.99%, and a spherical shape.

[0160] The aluminum powder used in the embodiment has an average particle size of 1 μm to 3 μm, a purity of 99.99%, and a spherical shape.

[0161] The ethyl cellulose resin used in the examples was purchased from Dow Chemical, model N200.

[0162] The rosin resin used in the examples was purchased from Guangzhou Songbao Chemical Co., Ltd., SBR140 type.

[0163] The acrylic resin used in the examples is purchased from Mitsubishi Chemical, model BR-116.

[0164] Examples and Comparative Examples

[0165] The compositions of the acetic acid resistant conductive pastes of Example (G) and Comparative Example are shown in Table 1 below:

[0166] Table 1

[0167]

[0168] The preparation method of the above-mentioned acetic acid resistant conductive paste is as follows:

[0169] (1) Preparation of organic carrier: Take ethyl cellulose resin, rosin resin and acrylic resin according to mass percentage, add solvent (propylene glycol methyl ether acetate), dissolve them at 100°C while heating and stirring. After 1 hour, a uniform and transparent organic carrier can be obtained.

[0170] (2) Preparation of glass powder: Weigh the above glass powder raw materials according to mass percentage, mix them evenly in a mixer, and place them in a high-temperature muffle furnace. The temperature is controlled at 1000°C and kept warm for 1 hour. Pour the molten glass slurry into deionized water for quenching, ball mill to 0.5μm~2μm, and then sieve through a 400-mesh screen to obtain suitable glass powder for use.

[0171] (3) Mixing silver-aluminum paste: Mix silver powder, aluminum powder, the organic vehicle prepared in step (1) and the glass powder prepared in step (2) according to mass percentage and stir them evenly.

[0172] (4) Dispersion of silver-aluminum paste: Place the material after stirring in step (3) into a three-roll mill and grind it three times until it is fine and uniform without obvious particles. The fineness is measured by a scraper fineness tester and is less than 10um.

[0173] Application Examples

[0174] This application example provides a TOPCON solar cell, and the preparation method thereof is as follows:

[0175] An N-type silicon wafer that has completed the TOPCON front-end process was selected, and the back main grid, back sub-grid, and front main grid of TOPCON were printed on the silicon wafer in succession by screen printing. After drying, the conductive paste prepared in Example 1 was printed on the surface of the silicon wafer as the front sub-grid (i.e., the front electrode), and sintered in a chain high-temperature fast-firing furnace, with the high-temperature zone set at 840° C. After sintering, the cell was then subjected to light injection treatment.

[0176] The above-mentioned battery sheet is loaded into the laser micro-guide processing equipment through a conveyor device and passed through the laser equipment with a laser power density of 100000W / cm 2 After treatment with a laser wavelength of 600nm, the cells flow out from the back of the device, are collected, and packaged for performance testing.

[0177] According to the above preparation method, TOPCON solar cells were prepared using the conductive pastes of the remaining embodiments and comparative examples.

[0178] Test Case

[0179] Test method:

[0180] (1) Battery performance test:

[0181] The TOPCON solar cells were tested under standard test conditions (STC) using a German HALM IV tester to obtain their open circuit voltage, short circuit current, series resistance, parallel resistance, fill factor and cell efficiency. The standard test conditions (STC) are: average ground illumination: AM1.5; solar radiation power: 1000W / m 2 ; The battery operating temperature is 25℃.

[0182] (2) Decay rate after acetic acid

[0183] Prepare acetic acid test solution: Mix 120 grams of potassium chloride, 500 grams of water and 25 grams of acetic acid;

[0184] The prepared acetic acid solution is placed at the bottom of the test box, and the TOPCON solar cell is placed vertically in the test box using a flower basket. There is no direct contact between the cell and the acetic acid test solution. The cell is kept at 80°C for 5 hours, taken out for cleaning, and the battery performance test is repeated to calculate the attenuation rate.

[0185] The test results are shown in Table 2 below:

[0186] Table 2

[0187]

[0188] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0189] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solution of the present application in detail, but it cannot be understood as limiting the scope of protection of the patent application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. An acetic acid resistant conductive paste, characterized in that: In terms of mass percentage, it includes the following components: Aluminum powder 0%~1% Special glass powder 1%~5% Silver powder 85%~90% Organic carrier 5%~10%; The special glass powder comprises the following components in percentage by mass: Lead oxide 35%~75% Boron oxide 5%~25% Silicon dioxide 1%~40% Titanium oxide 1%~10% Zinc oxide 0%~8% Alumina 1%~10% Bismuth oxide 0%~5% Magnesium oxide 0%~5%.

2. The acetic acid resistant conductive paste according to claim 1, characterized in that: The mass percentages of the components in the special glass powder are as follows: Lead oxide 35%~75% Boron oxide 5%~25% Silicon dioxide 1%~40% Titanium oxide 2%~10% Zinc oxide 0%~8% Alumina 1%~10% Bismuth oxide 0%~5% Magnesium oxide 0%~2.5%.

3. The acetic acid resistant conductive paste according to claim 1, characterized in that: In terms of mass percentage, it includes the following components: Aluminum powder 0% Special glass powder 1%~5% Silver powder 85%~90% Organic carrier 5%~10%; The special glass powder comprises the following components in percentage by mass: Lead oxide 63%~72% Boron oxide 8%~11% Silicon dioxide 3%~8% Titanium oxide 2%~8% Zinc oxide 0%~4% Alumina 2%~8% Bismuth oxide 0%~5% Magnesium oxide 0%~2%.

4. The acetic acid resistant conductive paste according to claim 1, characterized in that: In terms of mass percentage, it includes the following components: Aluminum powder 0.1%~0.5% Special glass powder 1%~5% Silver powder 85%~90% Organic carrier 5%~10%; The special glass powder comprises the following components in percentage by mass: Lead oxide 45%~50% Boron oxide 22%~23% Silicon dioxide 10%~15% Titanium oxide 2%~4% Zinc oxide 4%~5% Alumina 6%~8% Bismuth oxide 1%~2.5% Magnesium oxide 1%~2%.

5. The acetic acid resistant conductive paste according to any one of claims 1 to 4, characterized in that: The preparation method of the special glass powder comprises the following steps: Weighing raw materials according to the components of the special glass powder, mixing and then melting them, the melting treatment conditions include 800° C. to 1500° C., and keeping the temperature for 0.5 h to 1 h; The molten glass slurry is poured into water for quenching, and then ball-milled and sieved.

6. The acetic acid resistant conductive paste according to any one of claims 1 to 4, characterized in that: The silver powder has a purity of 99.9% to 99.999% and an average particle size of 1 μm to 8 μm, and optionally, an average particle size of 1 μm to 3 μm; and / or The aluminum powder has a purity of 99.9% to 99.999% and an average particle size of 0.5 μm to 10 μm, and optionally, an average particle size of 1 μm to 5 μm.

7. The acetic acid resistant conductive paste according to any one of claims 1 to 4, characterized in that: The organic carrier includes a resin and an organic solvent; wherein the resin includes one or more of ethyl cellulose resin, rosin resin and acrylic resin; the organic solvent includes one or more of propylene glycol butyl ether acetate, butyl carbitol, ethylene glycol monobutyl ether acetate and petroleum ether; optionally, it also includes one or both of a plasticizer and a surfactant.

8. A front electrode, characterized in that: It comprises a pole piece substrate and a conductive layer arranged on the pole piece substrate, wherein the conductive layer is formed by film-forming the acetic acid-resistant conductive paste according to any one of claims 1 to 7.

9. A solar cell, characterized in that: Comprising the front electrode as claimed in claim 8.

10. The solar cell according to claim 9, characterized in that: The solar cell is a tunneling oxide layer passivation solar cell.

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