Silver paste for solar cells and preparation method thereof

A technology of solar cells and silver paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems affecting the uniformity of silver powder, increasing contact resistance, and cracks, etc., to achieve The effect of small contact resistance, strong adhesion, and low ohmic contact resistance

Active Publication Date: 2012-01-18
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the particle size of the silver powder used in the existing silver paste is basically the same, so if the particle size of the silver powder is too large, cracks will appear in screen printing, and the contact resistance will increase. If the particle size of the silver powder is too small, the silver powder will appear. The problem of agglomeration affects the uniformity of its silver powder distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention relates to a silver paste for solar cells, the silver paste includes: 75wt% silver powder, 10wt% lead-free glass powder, 15wt% organic vehicle, the organic vehicle is composed of organic solvent and organic additives, two The weight ratio between them is 4: 1, and described silver powder is spherical, and the particle diameter of described silver powder contains two kinds of 40nm and 70nm; Described organic solvent comprises terpineol, turpentine, butyl carbitol, butyl Any one or their combination in carbitol acetate, ethers, plasticizer and surfactant; Described organic additive is cellulose; Described lead-free glass powder adopts lanthanum, boron, zinc glass system, its Components include: 1wt% La 2 o 3 , 70wt% B 2 o 3 , 5wt% Al 2 o 3 , 5wt% ZnO, 5wt% Na 2 O, 5wt% LiO 2 , 8wt% V 2 o 5 and 1wt% P 2 o 5 . Among the silver powders, those with a particle diameter of 40nm accounted for about 20%, and those with a particle diameter of 70nm account...

Embodiment 2

[0030]The present invention is a silver paste for solar cells, the silver paste includes: 78wt% silver powder, 10wt% lead-free glass powder, 12wt% organic vehicle, the organic vehicle is composed of organic solvent and organic additives, two The weight ratio between them is 5: 1, and described silver powder is spherical, and the particle size of described silver powder contains two kinds of 35nm and 55nm; Described organic solvent comprises terpineol, turpentine, butyl carbitol, butyl Any one or their combination in carbitol acetate, ethers, plasticizer and surfactant; Described organic additive is cellulose; Described lead-free glass powder adopts lanthanum, boron, zinc glass system, its Components include: 0.5wt% La 2 o 3 , 80wt% B 2 o 3 , 3wt% Al 2 o 3 , 2wt% ZnO, 3wt% Na 2 O, 2wt% LiO 2 , 4wt% V 2 o 5 and 0.5wt% P 2 o 5 . Among the silver powders, those with a particle diameter of 40nm accounted for about 20%, and those with a particle diameter of 70nm accounte...

Embodiment 3

[0037] The invention relates to a silver paste for solar cells, which includes: 80wt% silver powder, 8wt% lead-free glass powder, 12wt% organic vehicle, the organic vehicle is composed of an organic solvent and an organic additive, two The weight ratio between them is 6: 1, and described silver powder is spherical, and the particle size of described silver powder contains two kinds of 40nm and 80nm; Described organic solvent comprises terpineol, turpentine, butyl carbitol, butyl Any one or their combination in carbitol acetate, ethers, plasticizer and surfactant; Described organic additive is cellulose; Described lead-free glass powder adopts lanthanum, boron, zinc glass system, its Components include: 0.5wt% La 2 o 3 , 75wt% B 2 o 3 , 5wt% Al 2 o 3 , 5wt% ZnO, 3wt% Na 2 O, 2wt% LiO 2 , 4wt% V 2 o 5 and 0.5wt% P 2 o 5 . Among the silver powders, those with a particle diameter of 40nm accounted for about 35%, and those with a particle diameter of 80nm accounted for ...

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PUM

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Abstract

The invention discloses a silver paste for solar cells. The silver paste consists of silver powder, lead-free glass powder and an organic carrier, the organic carrier consists of organic solvent and organic additive, the silver powder is spherical and / or flaky, and the grain sizes of the silver powder are coarse and fine; the lead-free glass powder adopts a lanthanum-boron-zinc glass system, and the components of the lead-free glass powder are La2O3, B2O3, Al2O3, ZnO, Na2O, LiO2, V2O5 and P2O5. A preparation method for the silver paste includes the following steps: after being uniformly mixed, the materials of the lead-free glass powder are put into a high-temperature muffle furnace to heat, the temperature is preserved, and the melted glass powder particles are quenched and then ball-milled; the organic solvent and the organic additive are uniformly mixed and stirred according to proportion; the silver powder, the lead-free glass powder and the organic carrier are weighed, uniformly stirred in a container, put into a three-roll mill and ball-milled, and thereby the uniform silver paste for the solar cells is prepared. Under the premise of meeting the electrical properties of the solar cells, the silver paste also can meet the requirement on lead-free environment-friendliness.

Description

technical field [0001] The invention relates to a silver paste, in particular to a silver paste for solar cells and a preparation method thereof. Background technique [0002] A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy can be directly output through the electrodes. [0003] In order to draw out the photo-generated current generated by the solar cell, positive and negative electrodes must be made on the surface of the solar cell. Commonly used electrode manufacturing processes include magnetron sputtering, vacuum evaporation and screen printing sintering, etc., but the production costs of magnetron sputtering and vacuum evaporation methods are too high and the economy is poor. At present, lead-containing solar cell conductive silver paste is widely used in solar cell production enterprises, and electrodes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 张建益
Owner JIANGSU RUIDE NEW ENERGY TECH
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