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Front conductive silver paste for crystalline silicon solar cell and preparation method of front conductive silver paste

A technology for solar cells and conductive silver paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Current and other issues, to achieve the effect of improving aspect ratio, improving photoelectric conversion efficiency, and improving performance

Inactive Publication Date: 2021-10-29
浙江晶科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent CN 107919179 A proposes an organic carrier, which includes microgel particles and organosiloxane, which can better provide the printing fluency of the slurry and improve the aspect ratio of the printed grid lines to a certain extent , but after sintering, the grid line still has a large widening. The widening of the grid line will increase the light-shielding area on the surface of the cell, thereby reducing the short-circuit current and affecting the improvement of efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a front conductive silver paste for a crystalline silicon solar cell, comprising the steps of:

[0029] 1) By weight, 45 parts of oleyl alcohol, 10 parts of tributyl citrate, 10 parts of diethylene glycol butyl ether acetate, 10 parts of DBE, 2 parts of ethyl cellulose, 2 parts of rosin resin, 6 parts of egg Phospholipids, 6 parts of ethoxylated 1.6 hexanediol diacrylate, 4 parts of tripropylene glycol diacrylate, 5 parts of dipropylene glycol diacrylate, mix and stir evenly, heat and stir at 65°C for 1 hour, and filter after cooling formulated as an organic carrier;

[0030] 2) Add 8 parts by weight of organic carrier, 4 parts of glass powder (zinc oxide), and 88 parts of silver powder into the planetary mixer in order to mix them evenly, and then grind them 8 times through a three-roll mill to reach the fineness of the slurry If the thickness is less than 7 μm, the front conductive silver paste for solar cells can be obtained.

Embodiment 2

[0032] A method for preparing a front conductive silver paste for a crystalline silicon solar cell, comprising the steps of:

[0033] 1) By weight, 40 parts of diethylene glycol butyl ether, 10 parts of DBE, 8 parts of alcohol ester dodeca, 12 parts of 2,2,4-trimethyl-1,3-pentanediol diisobutyric acid ester, 4 parts of cellulose acetate butyrate, 4 parts of modified rosin, 8 parts of polysorbate, 4 parts of ethylene glycol diacrylate, 3 parts of triethylene glycol diacrylate, 4 parts of tetraethylene glycol diacrylate, 3 parts of 1,6-hexanediol diacrylate were mixed and stirred evenly, heated and stirred at 70°C for 1 hour, cooled and filtered to prepare an organic carrier;

[0034] 2) Add 12 parts by weight of organic carrier, 5 parts of glass powder (bismuth oxide), and 83 parts of silver powder into the planetary mixer in order to make it evenly mixed, and then grind it 7 times through a three-roller mill to the fineness of the slurry If the thickness is less than 7 μm, th...

Embodiment 3

[0036] A method for preparing a front conductive silver paste for a crystalline silicon solar cell, comprising the steps of:

[0037] 1) By weight, 50 parts of terpineol, 10 parts of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, 10 parts of triethylene glycol, 12 parts of tripropylene glycol methyl ether , 2 parts of polyester resin, 3 parts of acrylic resin, 3 parts of glyceryl monooleate, 4 parts of epoxy acrylate, 3 parts of polyurethane acrylate, 3 parts of polyether acrylate, mix and stir evenly, heat and stir at 65 °C for 1 hour , filtered after cooling to prepare an organic carrier;

[0038] 2) Add 15 parts by weight of organic carrier, 5 parts of glass powder (bismuth oxide), and 80 parts of silver powder into the planetary mixer in order to mix them evenly, and then grind them 8 times through a three-roller mill to reach the fineness of the slurry If the thickness is less than 7 μm, the front conductive silver paste for solar cells can be obtained.

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Abstract

The invention discloses front conductive silver paste for a crystalline silicon solar cell, and the silver paste comprises the following raw materials: 72-90% of silver powder; 4-10% of glass powder which is a metal oxide; 5-20% of an organic carrier, including 4-10% of resin, 2-8% of a dispersing agent, 75-85% of a solvent and 8-15% of a light-cured material. The invention also provides a preparation method of the solar front conductive silver paste, and the organic carrier is added in the method, so the conductive silver paste can bring a very high aspect ratio, and the electrical performance of the paste is further improved. The conductive silver paste comprises silver powder, glass powder and an organic carrier; the organic carrier comprises one or more photocuring materials, and the photocuring materials can effectively improve the aspect ratio of the printed conductive silver paste, so the solar energy conversion efficiency of a battery is improved.

Description

technical field [0001] The invention belongs to the field of new materials for solar cells, and in particular relates to a front conductive silver paste for crystalline silicon solar cells and a preparation method thereof. Background technique [0002] Energy is the foundation of the world's economic and social development. As a new type of clean energy, solar energy is a renewable energy that will play an important role in the future energy development process. Crystalline silicon solar cells are the main force of solar cells at present, and solar conductive silver paste is an important material that needs to be used in the process of preparing crystalline silicon solar cells, which has a crucial impact on the efficiency of solar cells. [0003] Conventional crystalline silicon solar cells print conductive silver paste on the surface of the cell through screen printing technology. The organic carrier mainly plays the role of wetting and dispersing the inorganic components, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224H01L31/05
CPCH01B1/16H01B1/22H01B13/00H01L31/022425H01L31/0512Y02E10/50
Inventor 李宇杨磊赵德平胡鹏
Owner 浙江晶科新材料有限公司
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