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Preparation method of aluminum conductive paste of high-performance environment protection solar cell

A technology of solar cells and conductive pastes, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as environmental pollution, improve photoelectric conversion rate, improve sintering pass rate, bend small effect

Inactive Publication Date: 2010-06-23
广东鑫皇冠新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of high-performance environment-friendly aluminum conductive paste for solar cells, the aluminum conductive paste prepared by this method does not contain lead, solves the problem of environmental pollution, and the non-conductive paste obtained in the preparation process The linear expansion coefficient of lead glass powder is close to that of silicon wafer, which improves the success rate after firing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of glass powder

[0022] Glass powder by weight percentage Al 2 o 3 10%; SiO 2 25%; V 2 o 2 5%; ZnO 10%; Bi 2 o 3 35%; Sb 2 o 3 5%; Fe 2 o 3 10% to prepare glass oxide powder; mix the prepared glass powder evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, and preheat it to 500°C at a rate of 30°C / s and keep it for 0.5h. Heat up to 1300°C at a rate of 80°C / s, melt for 3 hours, quench in water, dry until the water content is less than 5%, put it in a furnace at 1200°C for 3 hours, quench in water, put it into a ball mill after crushing, and control ZrO 2 Ball: glass powder: deionized water = 2:1:0.5, ball milled to a particle size of 5 μm, dried for later use.

[0023] (2) Preparation of inorganic binder glass metal powder

[0024] 1% by weight of indium powder, 2% of P 2 o 5 Add it to the prepared glass powder, the total amount is 100%. After uniform mixing, use a pulverizer with a speed of 1000-1500 ...

Embodiment 2

[0031] (1) Preparation of glass powder

[0032] Glass powder by weight percentage Al 2 o 3 8%; SiO 2 40%; V 2 o 2 2%; NiO 1%; ZnO 6%; Bi 2 o 3 32%; Sb 2 o 3 4%;Cr 2 o 3 1%; Fe 2 o 3 6%, after uniform mixing, prepare glass powder, inorganic binder glass metal powder and organic carrier according to the process of example 1.

[0033] (2) Preparation of aluminum conductive paste

[0034] Mix 80% by weight of aluminum powder wrapped by aluminum nitride, 13% of organic vehicle, 4% of inorganic binder glass metal powder, and 3% of 2-5μmC powder, and then grind it with a three-roller machine When the particle size reaches 15-30μm, a product with a viscosity of about 28000mpa·s is obtained.

[0035] After testing, the performance of the slurry meets the performance requirements of the present invention.

Embodiment 3

[0037] (1) Preparation of glass powder

[0038] Glass powder by weight percentage Al 2 o 3 15%; SiO 2 20%; V 2 o 2 1%; NiO 3%; ZnO 8%; Bi 2 o 3 40%; Sb 2 o 3 6%; Cr 2 o 3 2%; Fe 2 o 3 5%, after uniform mixing, prepare glass powder, inorganic binder glass metal powder and organic vehicle according to the process of Example 1.

[0039] (2) Preparation of aluminum conductive paste

[0040] Mix 85% by weight of aluminum powder wrapped by aluminum nitride, 9% of organic vehicle, 5% of inorganic binder glass metal powder, and 1% of 2-5μm C powder, and then use three rollers to Machine grinding until the particle size reaches 15-30 μm to obtain a product with a viscosity of about 35000 mpa·s.

[0041] After testing, the performance of the slurry meets the performance requirements of the present invention.

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Abstract

The invention discloses a preparation method of aluminum conductive paste of a high-performance environment protection solar cell. The aluminum conductive paste produced by the method is free of lead and solves the problem of environment pollution. The linear expansion coefficient of lead-free glass powder obtained in the preparation process is close to that of a silicon chip, and the success rate after burning is improved. The preparation method of the paste comprises the following steps: (1) preparing glass powder; (2) preparing inorganic adhesive glass metal powder; (3) manufacturing organic carriers; (4) adopting carbon powder of 2-5 mu m for later use; and (5) preparing the aluminum conductive paste: taking the following components by mass percent: 75-85% of aluminum powder coated by aluminum nitride, 9-20% of organic carrier, 3-4% of inorganic adhesive glass metal powder and 1-3% of C powder, wherein the total amount is 100%, and after mixing, grinding with a three-roller mill to particle size of 15-30 mu m to obtain the product with the viscosity of 25000-35000 mpa.s.

Description

technical field [0001] The invention relates to the technical field of conductive paste preparation, in particular to a preparation method of high-performance environment-friendly aluminum conductive paste for solar cells. Background technique [0002] Solar electrode conductive paste is one of the electronic information materials. As a structural material commonly used in silicon solar cells, conductive paste is directly related to the conversion efficiency and stability of the battery. This technology is used in LED (liquid crystal display device), LTCC (low temperature co- Sintered ceramic circuit boards), ceramic capacitors, new integrated circuits, aerospace and other fields also have important applications. [0003] The Chinese Patent Gazette with the notification number CN100446277C discloses the composition and preparation method of a silicon solar back field aluminum conductive paste. The paste consists of 70-80% conductive aluminum powder, 1-10% lead-containing gla...

Claims

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Application Information

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IPC IPC(8): H01L31/18H01L31/0224H01B1/16H01B1/22
CPCY02P70/50
Inventor 汪洋赵润峰黄滢张国明樊顺盛梁家强
Owner 广东鑫皇冠新材料有限公司
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