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Knotless screen printing front side silver paste for crystalline silicon solar cells

A technology of solar cells and silver paste, which is applied in the field of solar cells, can solve the problems of severe EL grid breakage on silicon wafers, low efficiency, small third- and fourth-line factories, and difficult survival of foundries, so as to improve the quality of screen printing , smooth printing effect

Inactive Publication Date: 2017-02-22
北京市合众创能光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve high efficiency and increase their market share, many battery factories have tried smooth printing with a line width below 30um, but this has resulted in severe EL grid breakage on silicon wafers, and instead of improving the battery efficiency of silicon wafers, on the contrary There are more defective products, and the efficiency cannot reach more than 18.3%, so we can only lose money and fight for the lowest price. The survival of third- and fourth-tier small factories and foundries is especially difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition and weight percentage of the positive silver conductive paste in this example: 75% of silver powder, 1% of glass powder, 5% of organic vehicle, 0.5% of BYK180 dispersant, the rest is solvent, and the glass powder is PbO-TeO2 series Glass powder, the particle size is 0.5-3 microns.

[0025] Prepare organic vehicle: 5% rosin, 1% ethyl cellulose, 5% polyamide, 50% butyl carbitol, 40% tributyl citrate, dissolve at 80°C for 2 hours, Obtain a uniform organic carrier;

[0026] According to the above formula ratio, weigh 75% of silver powder, 1% of glass powder, 5% of organic vehicle, and 0.5% of BYK180 dispersant, mix them evenly in a planetary mixer or other mixer, and then disperse them on a three-roller machine to below 10μm , can be made into crystalline silicon solar cell no network junction front silver paste. The front silver paste of the crystalline silicon solar cell is filtered through a 400-mesh sieve to obtain a very uniform front silver paste of ...

Embodiment 2

[0029] The composition and weight percentage of front silver conductive paste in this embodiment: silver powder is 90%, glass powder is 8%, organic vehicle is 15%, Tego240 is 1%, the rest is solvent, glass powder is PbO-TeO 2 A series of glass powders with a particle size of 0.5-3 microns.

[0030] Preparation of organic vehicle: ethyl cellulose 3%, polyvinyl butyral 2%, acrylic acid 3%, terpineol 50%, ethylene glycol phenyl ether 40%, dissolved at 80°C for 2 hours to obtain a uniform Organic carrier: According to the proportion of the above formula, 90% of silver powder, 8% of glass powder, 15% of organic carrier, 1% of Tego240, and the rest are solvents. On-machine dispersion to less than 10 μm can be used to make crystalline silicon solar cell network-free front-side silver paste. The front silver paste of the crystalline silicon solar cell is filtered through a 400-mesh sieve to obtain a very uniform front silver paste of the solar cell.

[0031] The slurry has a viscosi...

Embodiment 3

[0033] The composition and weight percentage of the positive silver conductive paste in this embodiment: silver powder is 80%, glass powder is 5%, organic vehicle is 8%, Tego270 is 0.8%, the rest is solvent, glass powder is PbO-TeO 2 A series of glass powders with a particle size of 0.5-3 microns.

[0034] Preparation of organic vehicle: 3% acrylic resin, 5% polyethylene resin, 3% rosin, 50% propylene glycol butyl ether, 40% dimethyl phthalate, dissolved at 80°C for 2 hours to obtain a uniform organic vehicle; According to the above formula ratio, weigh 80% of silver powder, silver powder, 5% of glass powder, 8% of organic carrier, 0.8% of Tego270, and the rest is solvent. Dispersed to less than 10 μm, it can be made into non-network front silver paste for crystalline silicon solar cells. The front silver paste of the crystalline silicon solar cell is filtered through a 400-mesh sieve to obtain a very uniform front silver paste of the solar cell.

[0035] The viscosity of th...

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Abstract

The invention relates to the technical field of solar cells, in particular to a knotless screen printing front side silver paste for crystalline silicon solar cells. The knotless screen printing front side silver paste is characterized by being prepared from, by weight, 75-90% of silver powder, 1-8% of glass powder, 5-15% of organic carriers, 0-3% of addition agents and the balance solvent, wherein organic resin in the organic carriers refers to one or more of rosin, ethyl cellulose, thermoplastic resin and acrylic resin, and the thermoplastic resin refers to one or more of PE-polyethylene, PVC-polyvinyl chloride, PS-polystyrene, PA-polyamide, POM-polyformaldehyde, PC-polycarbonate, PVB-polyvinyl butyral, polyphenyl ether, polysulfone and polyester. The knotless screen printing front side silver paste for the crystalline silicon solar cells has the advantages that several kinds of resins are selected to prepare the organic carriers, and a nonionic surface active agent is adopted to disperse the silver powder, so that knot-less silk-screen printing quality of the paste is improved, smooth printing is guaranteed, and EL (electroluminescence) of the crystalline silicon solar cells can meet related requirements.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a non-network screen plate front silver paste for crystalline silicon solar cells. Background technique [0002] At this stage, silicon-based solar cells are the earliest researched, most widely used, most basic and most important solar cells. In terms of conversion efficiency and material sources, silicon-based solar cells are still the key project for the development of solar cells in the future; in terms of photoelectric properties for solar cell applications, crystalline silicon is not the best material, but due to its preparation process and the impact on materials The research itself is very mature, so it will still be the dominant material in the solar cell market for a long time to come. [0003] After the rush to install in 630, the photovoltaic market situation has deteriorated sharply, especially for polycrystalline cells. In order to achieve high efficiency and ...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022433Y02E10/50
Inventor 任中伟赵德平丁兴隆
Owner 北京市合众创能光电技术有限公司
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