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Conductive paste for back electrode in crystalline silicon solar cell

A technology for solar cells and conductive paste, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials. It can solve the problems of easy soldering, high conductivity, and easy sintering of silver. The effect of good pulling force, improving product performance and enhancing competitiveness

Active Publication Date: 2012-09-26
SUZHOU ISILVER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Replacing part or all of silver with base metals is an important idea to reduce costs, but these base metals cannot simultaneously have the advantages of silver's easy sintering, difficult oxidation, difficult diffusion, high conductivity and easy soldering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0021] Embodiments 1-5: A conductive paste used for back electrodes in crystalline silicon solar cells, the conductive paste is shown in Table 1:

[0022] Table 1

[0023] silver powder Zinc compound Lead-free glass powder organic binder phase Example 1 30% 25%； 1%； 44% Example 2 40% 20%； 2%； 38% Example 3 50% 15%； 3%； 32% Example 4 55% 12%； 3%； 30% Example 5 60% 1%； 5%； 34%

[0024] The percentage sign in Table 1 represents the mass percentage content. The particle size range of the silver powder is 0.5 μm in Example 1, 1 μm in Example 2, 2 μm in Example 3, 3 μm in Example 4, and 4 μm in Example 5.

[0025] The zinc-containing composite agent is a mixture of zinc powder with a particle size of 0.5-4 μm and an organic zinc additive in a ratio of 4:0.1-1 parts by weight, specifically: in Example 1, the particle size is 0.5 μm, and the ratio of zinc powder and organic zinc additive is 4:0.1; the particle size o...

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PUM

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Abstract

The invention discloses a conductive paste for a back electrode in a crystalline silicon solar cell. The conductive paste consists of the following materials by mass percent: 30-60%of silver powder, 1-25%of zinc-containing complexing agent, 1-5% of lead-free glass powder and 25-50% of organic bonding phase, wherein the particle size of the silver powder is 0.5 to 4 mu m; the zinc-containing complexing agent is a mixture formed by zinc powder with the particle size of 0.5 to 4 mu m and an organic zinc additive according to a mass ratio of 4:(0.1-1); the organic bonding phase is an organic bonding phase formed by dissolving ethyl cellulose into a mixed solvent consisting of butyl carbitol acetate and terpineol; and the ratio of weight parts of the ethyl cellulose, the butyl carbitol acetate and the terpineol is 1:5:4. With the adoption of the conductive paste, the performance of the prior art is kept, and the cost of the conductive paste is greatly reduced, so that the competitiveness of the crystalline silicon solar cell is improved.

Description

technical field [0001] The invention relates to a conductive paste used for back electrodes in crystalline silicon solar cells, and belongs to the technical field of solar cell preparation. Background technique [0002] At present, the silver content of the back silver paste used in the market is generally more than 60%, and the silver content is relatively high, which brings huge cost pressure to the cell production enterprises. Replacing part or all of silver with base metals is an important idea to reduce costs, but these base metals cannot simultaneously have the advantages of silver's easy sintering, difficult oxidation, difficult diffusion, high conductivity and easy soldering. Therefore, how to ensure that the silver content is reduced while maintaining the existing product performance has become the direction of efforts of those of ordinary skill in the art. Contents of the invention [0003] The invention provides a conductive paste used for the back electrode of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01L31/0224
CPCH01B1/22
Inventor 陈东锋方惠傅坚包娜陈勇
Owner SUZHOU ISILVER MATERIALS
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