Silver paste used for printing crystalline silicon solar cell and preparation method for silver paste

A technology of solar cells and crystalline silicon, which is applied in the direction of cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems affecting the processing cost of silver paste, and achieve the effect of improving photoelectric conversion efficiency, reducing processing cost, and good electrical conductivity

Active Publication Date: 2017-05-31
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive silver powder content will greatly affect the processing cost of silver paste, so how to reduce the cost of silver paste has become a major technical problem in the cost control of solar cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] The preparation method step of silver paste for printing of crystalline silicon solar cell of the present invention is as follows:

[0047] a, weigh the above-mentioned raw materials according to the proportioning ratio;

[0048] (1) Preparation of slurry A

[0049] b1, the PbO, SiO 2 , B 2 o 3 , TeO 2 and other inorganic oxides are evenly mixed, and placed in a ceramic crucible for drying;

[0050] c1. Put the mixture obtained in step b1 into a muffle furnace for smelting for 1-2 hours, then extract it with water and dry it for later use;

[0051] d1. Grind the mixture obtained in step c1 with a planetary ball mill for 1-3 hours, then dry and sieve to obtain slurry A glass powder;

[0052] e1. Weigh the slurry A thickener, thixotropic agent, slurry A organic solvent and organic additives in proportion, and stir at room temperature until they are evenly mixed, then raise the ambient temperature to 80-120°C, and continue After stirring for 60-90 minutes, the slurr...

Embodiment 1

[0063] The silver paste for crystalline silicon solar cell printing of the present invention comprises: paste A and paste B, paste A includes silver-coated copper powder, paste A glass powder and paste A organic carrier, and the content of each component is calculated by mass percentage They are: silver-coated copper powder 90%; slurry A glass powder 5%; slurry A organic vehicle 5%, slurry B includes silver powder, slurry B glass powder and slurry B organic vehicle, and the content of each component is based on mass The percentages are: silver powder 95%; paste B glass powder 1%; paste B organic vehicle 4%.

[0064] The silver-coated copper powder of the paste A has a silver content of 50% and a particle size of 0.2 micron, and the silver powder of the paste B has a particle size of 0.1 micron. And the paste A glass powder is PbO-SiO 2 -B 2 o 3 -TeO 2 The system is a mixture that is mixed and melted in any proportion, and the paste B glass powder is Bi 2 o 3 -SiO 2 -B ...

Embodiment 2

[0083] The silver paste for crystalline silicon solar cell printing of the present invention comprises: paste A and paste B, paste A includes silver-coated copper powder, paste A glass powder and paste A organic carrier, and the content of each component is calculated by mass percentage They are: silver-coated copper powder 80%; slurry A glass powder 3%; slurry A organic vehicle 17%, slurry B includes silver powder, slurry B glass powder and slurry B organic vehicle, and the content of each component is based on mass The percentages are: silver powder 85%; slurry B glass powder 2%; slurry B organic vehicle 13%.

[0084] The silver-coated copper powder of the paste A has a silver content of 20% and a particle size of 0.5 microns, and the silver powder of the paste B has a particle size of 0.3 microns. And the paste A glass powder is PbO-SiO 2 -B 2 o 3 -TeO 2 The system is a mixture that is mixed and melted in any proportion, and the paste B glass powder is Bi 2 o 3 -SiO ...

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Abstract

The invention discloses silver paste used for printing a crystalline silicon solar cell. The silver paste used for printing the crystalline silicon solar cell is characterized by comprising paste A and paste B, wherein the paste A comprises 80-90% of silver-coated copper powder, 3-5% of paste A glass powder and 5-17% of paste A organic carrier based on mass percentages; and the paste B comprises 85-95% of silver powder, 1-2% of paste B glass powder and 4-13% of paste B organic carrier based on mass percentages. The silver paste used for printing the crystalline silicon solar cell is relatively low in cost and capable of ensuring photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to the field of solar cell manufacture, in particular to a silver paste used for secondary printing on the front of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] With the continuous development of the economy, the demand for energy is also increasing. With the continuous consumption of traditional petrochemical energy, the sustainable development of energy and the environmental protection of its use have gradually attracted everyone's attention. As a non-polluting, cheap and almost inexhaustible new energy source, solar energy has been favored by the majority of people in recent years. Photovoltaic power generation is a means of solar energy utilization that directly converts the sun's radiant energy into electrical energy. Its principle is based on the photovoltaic special effect of the semiconductor PN junction. Atoms absorb photons and become excited, forming electron-hole pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
CPCH01B1/22H01B13/00
Inventor 方志文方结彬秦崇德石强眭山何达能陈刚
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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