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Leadless electronic slurry composition for solar silicon photovoltaic cell and preparation method thereof

A technology of silicon photocells and electronic pastes, which is applied in the manufacture of circuits, electrical components, and final products. It can solve the problems of lead in inorganic glass powder and environmental pollution, and achieve the effects of small bending and improved photoelectric conversion efficiency.

Inactive Publication Date: 2009-01-14
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inorganic glass powder used in the known solar silicon photocell aluminum electronic paste generally contains lead, which will pollute the environment during the production and use of the paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] 1. Organic binder

[0028] Ethyl cellulose 2%, resin 1%, cetyl alcohol 2%, diethylene glycol methyl ether 8%, diethylene glycol butyl ether 4%, terpineol 70%, n-butanol 13% by mass percentage composition.

[0029] 2. Inorganic glass powder

[0030] The inorganic glass powder is lead-free glass powder, which is composed of 3% silicon dioxide, 65% boric acid, 3% aluminum oxide, 25% antimony oxide and 4% zirconium oxide by mass percentage.

[0031] 3. Aluminum powder: a spherical aluminum powder with a purity of more than 99.9%, a particle size of 2-3 μm, and a surface protected by a nitrogen layer.

[0032] 4. Additives: 40% of Sipan, 60% of pump oil.

[0033] 5. Preparation of lead-free electronic paste.

[0034] 73% of aluminum powder, 23% of organic binder, 1.5% of inorganic glass powder, and 2.5% of additives are mixed and ground with a three-roll mill to a fineness of 17.5-25 μm and a viscosity of 25,000-30,000 mpa·s to obtain lead-free electronic paste .

[00...

example 2

[0037] 1. Organic binder

[0038] Ethyl cellulose 1%, resin 0.5%, cetyl alcohol 3%, diethylene glycol methyl ether 8.5%, diethylene glycol butyl ether 4%, terpineol 70%, n-butanol 13% by mass percentage composition.

[0039] 2. Inorganic glass powder

[0040] The inorganic glass powder is lead-free glass powder, which is composed of 2% silicon dioxide, 63% boric acid, 4% aluminum oxide, 26% antimony oxide and 5% zirconium oxide by mass percentage.

[0041] 3. Aluminum powder: a spherical aluminum powder with a purity of more than 99.9%, a particle size of 4-5 μm, and a surface protected by a nitrogen layer.

[0042] 4. Additives: 45% of Siban, 55% of pump oil.

[0043] 5. Preparation of lead-free electronic paste

[0044] 75% of aluminum powder, 20% of organic binder, 2% of inorganic glass powder, and 3% of additives are mixed and ground with a three-roll mill to a fineness of 17.5-25 μm and a viscosity of 25,000-30,000 mpa·s to obtain lead-free electronic paste .

[004...

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Abstract

The invention discloses a compounding and a preparation method for lead-free electronic slurry used for a solar silicon photocell; according to the mass percentage, the slurry is obtained by preparing 70 to 75 percent of aluminium powders, 20 to 25 percent of organic adhesive, 1 to 5 percent of inorganic glass powders and 1 to 5 percent of additives; the aluminium powder is ball-shaped aluminium powder with the surface covered by an aluminium nitride protection layer, with the purity not less than 99.9 percent and the average grain size of 2 to 6 microns; simultaneously, organic adhesives consisting of ethyl cellulose, resin, hexadecanol, diethyleneglycol monomethyl ether, diethyleneglycol monobutyl ether, terpineol and n-butyl alcohol are added into the aluminium powder; the inorganic glass powder is silicon dioxide, boracic acid, alumina, antimony oxide and zirconia; the additive consists of Span and pump oil. The product prepared by the method of the invention has no dust generation or aluminium peeling phenomenon and achieves the requirement of no lead and environmental protection.

Description

Technical field: [0001] The invention relates to electronic paste for solar silicon photovoltaic cells, in particular to a preparation method of lead-free electronic paste. Background technique: [0002] Solar energy is an inexhaustible, pollution-free, noise-free new energy source. Solar cells are green and environmentally friendly renewable energy semiconductor devices that directly convert solar energy into electrical energy. The preparation of its electronic paste is mostly made of silver paste, silver-aluminum paste, and aluminum paste. Aluminum paste has cheap price and stable electrical performance. Aluminum and silicon are easy to form PN junctions, have long-wave response characteristics, have good ohmic contact characteristics with silicon wafers or ceramic substrates, and have good aging resistance. Therefore aluminum electronic paste is selected as the material for the back field of silicon solar cells. [0003] In order to reduce environmental pollution duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/50
Inventor 季福根
Owner NANTONG UNIVERSITY
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