Conductive slurry for photovoltaic battery back electrode

A technology of conductive paste and photovoltaic cells, which is applied in the direction of conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve the problems of easy sintering of silver, high conductivity, and easy welding, etc. Good effect in improving product performance, electrical performance and welding tension

Active Publication Date: 2014-07-09
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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Experimental program
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Effect test

Embodiment

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

[0021] Silver Powder 50%,

[0022] Zinc compound 15%,

[0023] Lead-free glass powder 3%,

[0024] Organic binder phase 32%;

[0025] The particle size of the silver powder is 1-3 μm, preferably 2 μm;

[0026] The zinc-containing composite agent is a mixture of zinc powder with a particle size of 4 μm and an organic zinc additive in a ratio of 0.8:4 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; the organic zinc additive is zinc methacrylate.

[0028] The silver powder has a particle size of 2 μm; the zinc-containing composite agent has a particle size of 4 μm, and the...

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PUM

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Abstract

The invention discloses conductive slurry for a photovoltaic battery back electrode. The conductive slurry comprises, by mass, 50% to 55% of silver powder, 12% to 20% of complexing agent containing zinc, 2% to 3% of lead-free glass powder, and 30% to 32% of organic binding phase. The grain size of the silver powder ranges from 1 micrometer to 3 micrometers. The complexing agent containing zinc is a mixture formed by zinc powder and an organic zinc addition agent, wherein the grain size of the zinc powder ranges from 0.5 micrometer to 4 micrometers, and the weight part ratio of the zinc powder to the organic zinc addition agent is 4: 0.1 to 4: 1. The organic binding phase is organic binding formed by dissolving ethyecellulose into a component solvent composed of butyl carbitol acetic ester and terpineol. The weight part ratio of ethyecellulose to butyl carbitol acetic ester to terpineol is 1: 5: 4. The organic zinc addition agent is zinc methacrylate. The conductive slurry maintains the existing technical performance, the cost of the conductive slurry is greatly reduced, and therefore competitiveness of a silicon crystal solar battery is improved.

Description

technical field [0001] The invention relates to a conductive paste for a back electrode of a photovoltaic cell, belonging to the technical field of photovoltaic 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 for the back electrode of a photovoltaic ...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0224
Inventor 陈东锋方惠傅坚包娜陈勇
Owner SUZHOU ISILVER MATERIALS
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