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Electrocondution slurry for back electrode of solar battery

A technology for solar cells and conductive paste, applied in the field of solar cells, can solve the problems of easy sintering, easy welding, and difficult diffusion of silver, and achieve the effects of reducing silver content, good electrical properties and welding tension, and improving product performance.

Active Publication Date: 2014-06-18
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
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Effect test

Embodiment

[0020] Embodiment: a kind of electroconductive paste for back electrode in solar cell, described electroconductive paste is made up of the material of following mass percentage content:

[0021] Silver Powder 30%,

[0022] Zinc compound 25%,

[0023] Lead-free glass powder 1%,

[0024] Organic binder phase 44%;

[0025] The particle size of the silver powder is 0.5 μm;

[0026] The zinc-containing composite agent is a mixture of zinc powder with a particle size of 0.5-4 μm and zinc stearate in a ratio of 4:0.1-1 parts by weight;

[0027] The organic binding phase is an organic bond formed by dissolving ethyl cellulose in a mixed solvent composed of butyl carbitol acetate and terpineol. The ethyl cellulose, butyl carbitol acetate , The weight ratio of terpineol is 1:5:4.

[0028] The zinc-containing composite agent has a particle size of 0.5 μm, and the ratio of zinc powder to zinc stearate is 4:0.1;

[0029] After the above-mentioned conductive paste is evenly stirred in...

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Abstract

The invention discloses electrocondution slurry for a back electrode of a solar battery. The electrocondution slurry consists of the following materials according to mass percentage composition: 30-40 % of silver powder, 25 % of zinciferous complexing agent, 1-2 % of unleaded glass dust, and 44-50 % of organic binding phase, wherein the grain diameter of the silver powder is 0.5-1 micron; the zinciferous complexing agent is a mixture which is formed by zinc powder with the grain diameter of 0.5-4 microns and zinc stearate according to a part by weight proportion of 4:0.1-1; the organic binding phase is organic cementation which is formed by dissolving ethyl cellulose into a mixed solvent which is formed by butyl carbitol acetic ester and terpineol; the part by weight proportion of the ethyl cellulose, the butyl carbitol acetic ester and the terpineol is 1:5:4. According to the electrocondution slurry for the back electrode of the solar battery, the existing technical feature is kept, the cost of the electrocondution slurry is greatly reduced, and the competitive power of the amorphous silicon solar battery is thus promoted.

Description

technical field [0001] The invention relates to a conductive paste for back electrodes in solar cells, belonging to the technical field of solar cells. 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 for a back electrode in a solar cell. The conductive paste maintains...

Claims

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Application Information

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