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A kind of non-network front silver paste for crystalline silicon perc solar cell and preparation method thereof
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A solar cell, junction-free technology, applied in the field of solar cells, can solve problems such as reducing the width of fine grids, and achieve the effects of improving current export capability and increasing photoelectric conversion efficiency
Active Publication Date: 2022-06-10
浙江晶科新材料有限公司
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Problems solved by technology
[0004] The fine grid line of the screen printing screen used in the traditional front electrode uses the conventional mesh screen with a line width of 24-28 μm. The existence of the network knot limits the line width of the fine grid line and limits the improvement of the aspect ratio of the fine grid line, so it is urgent It is necessary to develop a non-network front silver paste with a narrow line width of 18-20 μm, reduce the width of the fine grid, increase the height of the fine grid, and increase the aspect ratio of the fine grid, thereby improving the current export capability of the cell and increasing the photoelectricity. Conversion efficiency
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Embodiment 1
[0019] The preparation method of the crystalline silicon PERC solar cell with no mesh front conductive silver paste comprises the following steps:
[0020] 1) By weight, 41 parts of butyl carbitol acetate, 10 parts of diethylene glycol dibutyl ether, 15 parts of alcohol ester 12, 10 parts of DBE, 10 parts of dimethyl adipate, 2.5 parts of ethyl acetate Base cellulose, 2 parts of rosin resin, 1 part of acrylic resin, 3 parts of polyvinyl butyral resin, 5.5 parts of polyamide wax are mixed and stirred evenly, heated and stirred at a constant temperature of 65 ° C for 1 hour, cooled and filtered to prepare an organic carrier;
[0021] 2. Add 7.7 parts of organic carrier, 0.3 part of AK500 (organic silicone oil), 0.3 part of TDO (surfactant), 2.4 parts of glass powder, and 89.3 parts of silver powder to the planetary mixer in order by weight, and mix them evenly, then Grind 8 times by a three-roll mill until the fineness of the slurry is less than 7 μm, and obtain the front conduc...
Embodiment 2
[0023] The preparation method of the crystalline silicon PERC solar cell with no mesh front conductive silver paste comprises the following steps:
[0024] 1) In parts by weight, combine 46 parts of butyl carbitol acetate, 10 parts of diethylene glycol dibutyl ether, 10 parts of alcohol ester 12, 10 parts of tributyl citrate, and 10 parts of dimethyl adipate. , 2 parts of ethyl cellulose, 1.5 parts of cellulose acetate butyrate, 1 part of acrylic resin, 4 parts of polyvinyl butyral resin, and 5.5 parts of polyamide wax were mixed and stirred evenly, heated and stirred at a constant temperature of 65 °C for 1 hour, and after cooling It is formulated into an organic carrier after filtration;
[0025] 2) According to the weight ratio: organic carrier 7.4 parts, AK500 (organic silicone oil) 0.5 parts, TDO (surfactant) 0.3 parts 0.8 parts, glass powder 2.4 parts, silver powder 89.4 parts are added to the centrifuge or planetary mixer to make The mixture is uniformly mixed, and the...
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Abstract
The invention discloses a non-network junction front silver paste for crystalline silicon PERC solar cells and a preparation method thereof. The non-network front silver paste for crystalline silicon PERC solar cells is composed of the following components in weight percentage: silver powder 86-90%, glass powder 0.5-3%, organic vehicle 4-10%, additives 0.2-3%, The organic vehicle comprises the following components by weight percentage: 3-10% resin, 3-6% thixotropic agent and 84-93% solvent. In the present invention, by adopting a limited method, the obtained no-knot front conductive silver paste can be adapted to the smooth printing of a no-knot screen with a line width of 18-20 μm, which solves the problem of "the traditional screen printing screen used by the front electrode" in the background technology. The fine grid line uses the conventional netted screen with a line width of 24‑28 μm. The existence of the network knot limits the line width of the fine grid line and limits the improvement of the aspect ratio of the fine grid line, and can obtain a sintered line width of 28‑28 μm 40μm, a height of 12-18μm, and a thin grid line with an aspect ratio of 0.4-0.54, which greatly improves the current export capability of the cell and increases the photoelectric conversion efficiency.
Description
technical field [0001] The invention belongs to the technical field of solar cells, and specifically relates to a front silver paste without mesh junction for crystalline silicon PERC solar cells and a preparation method thereof. Background technique [0002] Energy is the cornerstone of economic and social development. When electricity, coal, oil and other non-renewable energy sources are frequently in emergency, energy issues have increasingly become a bottleneck restricting the development of international society and economy. Solar energy is the most abundant renewable energy available to human beings, and solar cells directly convert solar energy into electrical energy. Driven by the huge potential of the international photovoltaic market, the solar cell manufacturing industries of various countries are scrambling to invest huge amounts of money to expand production in order to gain a place. Considering the conversion efficiency and material sources, silicon-based sola...
Claims
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