Crystalline silicon solar cell silver paste with low silver content and preparation method thereof

A technology for solar cells and crystalline silicon, which is applied in the field of low silver content crystalline silicon solar cell silver paste and its preparation, can solve the problems of easy sintering, difficult oxidation and high conductivity of silver powder, and achieves the reduction of silver content, less ash residue, The effect of high specific surface area

Active Publication Date: 2016-08-31
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above works have reduced the silver content of the silver paste to some extent, the base metal powder used cannot simultaneously have the advantages of easy sintering, difficult oxidation, difficult diffusion, high conductivity and easy soldering of silver powder.

Method used

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  • Crystalline silicon solar cell silver paste with low silver content and preparation method thereof
  • Crystalline silicon solar cell silver paste with low silver content and preparation method thereof
  • Crystalline silicon solar cell silver paste with low silver content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In Examples 1-3, the average particle size of the spherical silver powder is 0.2~3μm, and the tap density is 4.5~5.5 g / cm 3 ; The average particle size of flake silver powder is 2~6μm, and the tap density is 4.0~4.5 g / cm 3 In Example 1 and Example 3, the micro-nano reticulated silver powder has a two-dimensional structure, with a size range of 0.1~10μm, a porosity of 20~60%, and a pore size <100nm; in Example 2 the micro-nano reticulated silver powder is Three-dimensional structure, other specifications are the same as above.

[0036] The glass powder system in Examples 1 to 3 and Comparative Examples 1 to 3 is lead-free glass powder, the formula of lead-free glass powder and its mass percentage composition are: Bi 2 O 3 40~60%, B 2 O 3 10~20%, SiO 2 8~15%, ZnO 10~30%, Al 2 O 3 0.5~5%, BaO 0.1~2%, TeO 2 10~25%, ZrO 2 0~3% and TiO 2 1~5%. The glass powder composition selected in the embodiment is: Bi 2 O 3 43%, B 2 O 3 15%, SiO 2 10%, ZnO 12%, Al 2 O 3 3%, BaO 1%, ...

Embodiment 2

[0038] The mass percentages of the components of the organic vehicle in Example 2 are: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate 35%, and diethylene glycol butyl ether 30% , 3-hydroxy-3-carboxyl tributyl glutarate 12%, dimethyl adipate 5%, cellulose acetate butyrate 2%, ethyl cellulose 8%, rosin resin 8%.

Embodiment 3

[0039] The mass percentage content of each component of the organic carrier in Example 3 is preferably: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate 30%, and diethylene glycol butyl ether 35%. Tributyl 3-hydroxy-3-carboxyglutarate 10%, dimethyl adipate 5%, cellulose acetate butyrate 5%, ethyl cellulose 5%, rosin resin 10%.

[0040] Additives: Example 1 adds thixotropic agent 1.5%, defoamer 0.3%, dispersant 0.2%, leveling agent 0.7% and wetting agent 0.3%; Example 2 only adds thixotropic agent, example 3 Add thixotropic agent 1.5%, defoamer 0.3%, and dispersant 0.2%.

[0041] Taking Example 1 as a reference sample, in Comparative Example 1, no micro-nano reticulated silver powder was added, and the mass percentage of spherical silver powder and flake silver powder was increased, and the content of other components was the same as that of Example 1.

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Abstract

The invention discloses crystalline silicon solar cell silver paste with a low silver content and a preparation method thereof. The crystalline silicon solar cell silver paste is composed of: silver powder, an organic carrier and an auxiliary agent. An organic solvent and a thickening agent are mixed to form the organic carrier. Micro-nano netted silver powder, spherical silver powder and sheet-shaped silver powder are mixed to form the silver powder. With 100% of the mass of the crystalline silicon solar cell silver paste, the mass percent of the micro-nano netted silver powder is 5-16%. According to the invention, a proper amount of micro-nano netted silver powder is added to conventional silver paste, the micro-nano netted silver powder has a porous characteristic, and compared with other entity silver powder with the same particle size, the fusion speed of the micro-nano netted silver powder is low and can relatively well maintain the structure characteristic in an existing paste flash burning process, so that the purpose of lowing the silver content of the paste is achieved.

Description

Technical field [0001] The invention relates to conductive silver paste for crystalline silicon solar cells, in particular to a low-silver content crystalline silicon solar cell silver paste and a preparation method thereof. Background technique [0002] With the extreme consumption of fossil energy, the resulting energy depletion and the increasingly serious greenhouse effect, the demand for new clean energy has become more and more urgent. As the most ideal renewable energy source, solar energy has the characteristics of "inexhaustible and inexhaustible", and the use of solar energy to generate electricity has the advantages of environmental protection, low cost, and high efficiency, and there is no need to consider its safety. At present, crystalline silicon solar cells are one of the effective devices that convert solar energy into electric energy. Its application range is expanding from aerospace, military, to people’s daily life. While not generating new pollution, the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 杨贵忠陈晓蕾李茂林
Owner JIANGSU HOYI TECH
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