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Lead-free silver and aluminum slurry for solar photocell and preparation method of slurry

A photovoltaic cell and solar energy technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of lead in inorganic glass powder, environmental pollution, etc., and achieve the effect of improving network performance, good ohmic contact, and improving photoelectric conversion efficiency.

Active Publication Date: 2014-01-29
JIANGSU RUIDE NEW ENERGY TECH
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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

Embodiment 1

[0028] A lead-free silver-aluminum paste for solar photovoltaic cells, characterized in that the paste is made of 80% silver powder, aluminum powder and copper powder, 15% organic binder, 2% inorganic glass powder, 3% The composition of additives, the total mass is 100%; the purity of the silver powder, aluminum powder and copper powder is ≥99.9%, the average particle size is 3 μm, and the spherical silver powder, aluminum powder and copper powder are covered with a nitride protective layer on the surface; Described organic binder is made up of 0.5% butyl carbitol, 1.5% resin, 1% rosin, 11% diethylene glycol methyl ether, 6% diethylene glycol butyl ether, 65% by mass percent % cyclohexanone and 15% n-butanol, the total mass is 100%; the inorganic glass powder is 3% titanium dioxide by mass percentage, 70% boric acid, 5% aluminum oxide, 20% oxide Antimony is composed of 2% zirconia, and the total mass is 100%; the additive is composed of 45% Span by mass percentage, and 55% pum...

Embodiment 2

[0044] The invention is a lead-free silver-aluminum paste for solar photovoltaic cells. The paste is composed of 75% silver powder, aluminum powder and copper powder, 18% organic binder, 5% inorganic glass powder, 2% The composition of additives, the total mass is 100%; the purity of the silver powder, aluminum powder and copper powder is ≥99.9%, the average particle size is 3 μm, and the surface is covered with a nitride protective layer. Spherical and / or flake-shaped silver powder, aluminum powder and copper powder; the organic binder consists of 1% butyl carbitol, 2% resin, 3% rosin, 11% diethylene glycol methyl ether, 9% diethylene glycol by mass percentage Alcohol butyl ether, 60% cyclohexanone and 14% n-butanol are composed of 100% total mass; the inorganic glass powder is 1% titanium dioxide by mass percentage, 75% boric acid, 3% aluminum oxide , 19% of antimony oxide, 2% of zirconia, the total mass is 100%; the additive is composed of 35% of Siban by mass percentage, 6...

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PUM

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Abstract

The invention discloses lead-free silver and aluminum slurry for a solar photocell. The slurry is prepared from raw materials in percent by mass as follows: 75-80% of silver powder, aluminum powder and copper powder, 15-20% of organic bond, 1-5% of inorganic glass powder, and 1-5% of additive; the purities of the silver powder, the aluminum powder and the copper powder are more than or equal to 99.9%; the organic bond is prepared from the following materials in percent by mass of: 0.5-2% of butyl carbitol, 1-2.5% of resin, 1-4% of rosin, 11-13% of ethylene glycol monomethyl ether, 5-9% of diethylene glycol monobutyl ether, 65-75% of cyclohexanone and 10-20% of n-butyl alcohol; the inorganic glass powder is prepared from the following materials in percent by mass of: 1-3% of titanium dioxide, 55-75% of boric acid, 3-5% of aluminium sesquioxide, 15-25% of antimony oxide and 2-5% of zirconium oxide; and the additive is prepared from the following materials in percent by mass of: 35-45% of span and 55-65% of pump oil. The lead-free silver and aluminum slurry prepared by the raw material has the advantages of good weldability and strong adhesion and meets the lead-free environmental friendless requirement.

Description

technical field [0001] The invention relates to an electronic paste for solar silicon cells, in particular to a lead-free silver-aluminum paste for solar photovoltaic cells and a preparation method thereof. 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 re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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