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Silver paste of high-performance lead-free crystalline silicon solar battery back electrode and preparation method thereof

A technology of solar cells and lead-free crystalline silicon, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., which can solve the problem of large contact resistance and series resistance, insufficient density of the silver layer of the silver electrode, and Insufficient adhesion of silver electrodes and other problems, to achieve the effect of enhancing compactness, improving solderability and solder resistance, and improving fusion contact

Inactive Publication Date: 2016-11-16
苏州柏特瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing crystalline silicon solar cells, the silver layer of the silver electrode on the back of the sintered silver paste is not dense enough, the adhesion of the silver electrode is not high enough, the contact resistance and series resistance are large, and the photoelectric conversion efficiency is low.

Method used

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  • Silver paste of high-performance lead-free crystalline silicon solar battery back electrode and preparation method thereof
  • Silver paste of high-performance lead-free crystalline silicon solar battery back electrode and preparation method thereof
  • Silver paste of high-performance lead-free crystalline silicon solar battery back electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] (1) prepare graphene slurry:

[0044] Weigh 0.01g graphene (thickness is 3nm, sheet size is 5μm, specific surface area is 300㎡ / g), organic binder 10g, auxiliary agent is dispersant and leveling agent, wherein BYK-110 is used as dispersant , and weigh 0.1g of the dispersant, use BYK-333 as the leveling agent, and weigh 0.1g of the leveling agent, stir and mix in the container, grind and disperse on the three-roll mill to control the slurry The fineness is less than 15μm.

[0045] (2) Prepare back electrode silver paste:

[0046] Weigh 10g of irregular silver powder, 20g of high specific surface area silver powder, 58g of organic binder, 1.5g of lead-free glass powder, 0.09g of boron powder, and 0.2g of silicon powder. Continue to stir and mix the graphene slurry evenly, and then grind and disperse it on a three-roll mill to control the slurry fineness to less than 15 μm and viscosity to 30 Pa·s (25°C, Brookfield HBIIPro+).

[0047] The above silver paste is on productio...

Embodiment 2

[0051] (1) prepare graphene slurry:

[0052] Weigh 1g of graphene (thickness is 2nm, sheet size is 3μm, specific surface area is 400㎡ / g), organic binder 10g, auxiliary agent is dispersant and leveling agent, wherein BYK-110 is used as dispersant, And take the dispersant 0.1g, adopt BYK-333 as the leveling agent, and take the leveling agent 0.1g, stir and mix in the container, grind and disperse on the three-roll mill, control the fineness of the slurry The degree is less than 15 μm.

[0053] (2) Prepare back electrode silver paste:

[0054] Weigh 42g of silver powder with high specific surface area, 41.5g of organic binder, 5g of lead-free glass powder, 0.1g of boron powder, and 0.2g of silicon powder, stir and mix in the container, then add graphene slurry, continue to stir and mix evenly , and then grind and disperse on a three-roll mill to control the slurry fineness to less than 15 μm and viscosity to 70 Pa·s (25°C, Brookfield HB Ⅱ Pro+).

[0055] Above-mentioned embodi...

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Abstract

The invention discloses a silver paste of a high-performance lead-free crystalline silicon solar battery back electrode. The silver paste comprises, by weight, 30 to 58% of silver powder, 1 to 5% of lead-free glass powder, 0.01 to 10% of graphene, 0 to 1% of inorganic additive, 40 to 68% of an organic adhesive, and 0. 1 to 2% of an auxiliary agent. The mixed silver powder is a mixture including irregularly-shaped silver powder and silver powder with a high specific surface area. In addition, the invention also discloses a preparation method for the silver paste of the high-performance lead-free crystalline silicon solar battery back electrode. Graphene, an auxiliary agent, and a part of organic adhesive are mixed and then the mixture is rolled to form a slurry, so that a graphene slurry is obtained; silver powder, lead-free glass powder, an inorganic additive, and the rest of organic adhesive are mixed and stirred uniformly and then the graphene slurry is added; and stirring and mixing are carried out continuously and uniformly, so that a needed silver paste is obtained. According to the invention, the fusion and contact with an aluminum back field are improved; the contact resistance between the silver electrode and the aluminum back field is reduced; the conversion efficiency of the battery piece is improved; and the electrode weldability and soldering resistance performance are enhanced.

Description

technical field [0001] The invention relates to a raw material for producing a back electrode of a crystalline silicon solar cell, in particular to a high-performance silver paste for a back electrode of a lead-free crystalline silicon solar cell and a preparation method thereof. Background technique [0002] A crystalline silicon solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy can be output through the electrodes. At present, the electrodes of crystalline silicon solar cells are mainly produced by screen printing. By printing silver paste on the front and back of the battery, after high-temperature sintering treatment, the silver powder is attached to the surface of the battery to form positive and negative electrodes, and the silver powder forms an ohmic contact with the semiconductor material silicon. . In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224H01B13/00
CPCH01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 魏艳彪白少勇李小龙
Owner 苏州柏特瑞新材料有限公司
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