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Aluminum paste for silicon-based solar cell and preparation method for aluminum paste

A technology for solar cells and aluminum-silver paste, which is used in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problem of unstable battery performance, failure to solve the co-firing stability of production sintering process, preparation of aluminum-silver paste and silver paste There are no breakthroughs in technology, etc., to achieve good economic effects, environmental protection, and reliable connections.

Inactive Publication Date: 2012-06-27
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum paste preparation technology There have been several large and small manufacturers in China, and the product quality is relatively stable. However, the preparation technology of aluminum silver paste and silver paste has not been broken through. The products on the market are still mainly imported, and the production and sintering process has not been solved. Co-firing stability in medium, the performance of the battery is unstable after using the slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of aluminum-silver paste for silicon-based solar cell, its concrete preparation is to finish according to following process steps:

[0018] First prepare the following raw materials according to mass percentage:

[0019] 40% silver powder, 30% aluminum powder, 1% inorganic binder, 20% organic vehicle, 5% defoamer, 4% surfactant;

[0020] The silver powder is a spherical silver powder with a purity of 99.5% and a particle diameter of 2-5 μm. The aluminum powder is ultra-fine aluminum powder with a purity of 99% and a particle size of 2-5 μm. The inorganic binder has a particle size of 2-5 μm, a softening point of 600-700°C, and an expansion coefficient of 8-11×10 -7 / ℃ aluminum borosilicate glass powder. The organic vehicle is obtained by dissolving 20% ​​organic resin: ethyl cellulose into 80% solvent: ethylene glycol ethyl ether acetate by mass percentage, and filtering through a 250-mesh standard sieve. Described defoamer is sodium dodecylsulfonate. Descri...

Embodiment 2

[0026] A kind of aluminum-silver paste for silicon-based solar cell, its concrete preparation is to finish according to following process steps:

[0027] First prepare the following raw materials according to mass percentage:

[0028] 45% silver powder, 24% aluminum powder, 2% inorganic binder, 14% organic vehicle, 5% defoamer, 10% surfactant;

[0029] The silver powder is a spherical silver powder with a purity of 99.5% and a particle diameter of 2-5 μm. The aluminum powder is ultra-fine aluminum powder with a purity of 99% and a particle size of 2-5 μm. The inorganic binder has a particle size of 2-5 μm, a softening point of 600-700°C, and an expansion coefficient of 8-11×10 -7 / ℃ aluminum borosilicate glass powder. The organic vehicle is obtained by dissolving 30% organic resin: ethyl cellulose in 70% solvent: ethyl acetate by mass percentage, and filtering through a 250-mesh standard sieve. The defoamer is 1,4-dihydroxysulfonate amine. Described surfactant is lactate ...

Embodiment 3

[0035] A kind of aluminum-silver paste for silicon-based solar cell, its concrete preparation is to finish according to following process steps:

[0036] First prepare the following raw materials according to mass percentage:

[0037] 55% silver powder, 30% aluminum powder, 5% inorganic binder, 5% organic vehicle, 2% defoamer, 3% surfactant;

[0038] The silver powder is a spherical silver powder with a purity of 99.5% and a particle diameter of 2-5 μm. The aluminum powder is ultra-fine aluminum powder with a purity of 99% and a particle size of 2-5 μm. The inorganic binder has a particle size of 2-5 μm, a softening point of 600-700°C, and an expansion coefficient of 8-11×10 -7 / ℃ aluminum borosilicate glass powder. The organic vehicle is obtained by dissolving 40% organic resin: methylcellulose into 60% solvent: terpineol by mass percentage, and filtering through a 250-mesh standard sieve. Described defoamer is vinyl diphenylmethane. Described surfactant is polyvinylpyrr...

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Abstract

The invention relates to aluminum paste for a silicon-based solar cell and a preparation method for the aluminum paste. The aluminum paste is characterized by consisting of the following components in percentage by mass: 10 to 30 percent of aluminum powder, 1 to 6 percent of inorganic adhesive, 5 to 20 percent of organic carrier, 2 to 5 percent of antifoaming agent, 3 to 10 percent of surfactant and the balance of silver powder. The aluminum paste and the preparation method for the same have the advantages that: 1, the addition of any harmful element containing lead, cadmium and the like in an aluminum paste preparation process is avoided, so that a requirement for the environment friendliness of raw materials for preparing a modern electronic component is met; 2, the cost of the prepared aluminum paste is lower than that of pure silver paste, so that the aim of decreasing the manufacture cost of the silicon-based solar cell is fulfilled; and 3, the organic solvent carrier is prepared by blending solvents with different boiling points and volatilization speeds according to a certain proportion, and the antifoaming agent and the surfactant are sequentially added in the preparation process, so that the aluminum paste is sequentially volatilized in the processes of printing, leveling, sintering and the like, and the sintered paste is securely bonded with a silicon chip.

Description

technical field [0001] The invention relates to an aluminum silver paste for silicon-based solar cells and a preparation method thereof. Background technique [0002] In recent years, with the increasing shortage of conventional energy sources such as coal, oil, and natural gas, the development of renewable green energy is imminent. Countries have invested huge sums of money in developing new energy and promulgating relevant green energy development promotion regulations, and the solar photovoltaic industry has developed rapidly. The aluminum silver paste used in this industry is one of the electronic pastes used in the back field of solar cells, and the market demand is constantly expanding. [0003] Aluminum silver paste is mainly used as electrode material in the manufacture of silicon-based solar cells. With the rapid development of solar cell manufacturing technology, the improvement of conversion efficiency and the extension of applicable life, the corresponding requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
Inventor 张宇阳
Owner IRICO
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