High-performance back surface field paste for crystalline silicon solar cell

A technology of solar cells and crystalline silicon, applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, to achieve the effects of reducing warpage, improving compactness, and improving conductivity

Inactive Publication Date: 2014-05-28
山西盛驰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the performance of aluminum paste produced by domestic manufacturers is close to that of foreign products, but further improvement is needed in terms of photoelectric conversion efficiency, appearance, warpage, etc.

Method used

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  • High-performance back surface field paste for crystalline silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of organic carrier

[0020] Take 3% of ethyl cellulose with a viscosity of 10 mPa·s, 2% of ethyl cellulose with a viscosity of 45 mPa·s, 5% of benzyl alcohol, 40% of terpineol, 15% of butyl carbitol, Carbitol acetate 15%, tributyl citrate 13%, dispersant 5%, phenolic resin 2%, total 100%. First add benzyl alcohol, terpineol, butyl carbitol, butyl carbitol acetate and tributyl citrate into the reaction kettle, stir evenly, heat to 60°C, then add dispersant, phenolic resin and ethyl alcohol Ethyl cellulose was stirred for 2-5 hours until the ethyl cellulose was completely dissolved to obtain a transparent and uniform organic carrier.

[0021] 2. Preparation of mixed aluminum powder

[0022] Take 5% of 1-2μm aluminum powder, 10% of 2-3μm aluminum powder, 35% of 4-5μm aluminum powder and 50% of 5-6μm aluminum powder according to the mass percentage, the total amount is 100%, and mix them evenly to obtain the mixed aluminum powder.

[0023] 3. Preparation o...

Embodiment 2

[0033] 1. Preparation of organic carrier

[0034] Take 2% of ethyl cellulose with a viscosity of 10 mPa·s, 3% of ethyl cellulose with a viscosity of 45 mPa·s, 5% of benzyl alcohol, 20% of terpineol, 25% of butyl carbitol, and butyl carbitol according to mass percentage. Carbitol acetate 25%, tributyl citrate 12%, dispersant 5%, epoxy resin 3%, total 100%. First add benzyl alcohol, terpineol, butyl carbitol, butyl carbitol acetate and tributyl citrate into the reaction kettle, stir evenly, heat to 70°C, then add dispersant, epoxy resin and Ethyl cellulose, stirred for 2-5 hours, until the ethyl cellulose is completely dissolved to obtain a transparent and uniform organic carrier.

[0035] 2. Preparation of mixed aluminum powder

[0036] According to mass percentage, take 10% of 1-2μm aluminum powder, 5% of 2-3μm aluminum powder, 30% of 4-5μm aluminum powder, 55% of 5-6μm aluminum powder, the total amount is 100%, and mix them evenly to obtain a mixed aluminum powder.

[0037...

Embodiment 3

[0047] 1. Preparation of organic carrier

[0048] Take 1% ethyl cellulose with a viscosity of 10 mPa s, 4% ethyl cellulose with a viscosity of 45 mPa s, 5% benzyl alcohol, 30% terpineol, 15% butyl carbitol, and Carbitol acetate 25%, tributyl citrate 10%, dispersant 7%, polyester resin 3%, total 100%. First add benzyl alcohol, terpineol, butyl carbitol, butyl carbitol acetate and tributyl citrate into the reaction kettle, stir evenly, heat to 80°C, then add dispersant, polyester resin and Ethyl cellulose, stirred for 2-5 hours, until the ethyl cellulose is completely dissolved to obtain a transparent and uniform organic carrier.

[0049] 2. Preparation of mixed aluminum powder

[0050] Take 15% of 2-3μm aluminum powder, 40% of 4-5μm aluminum powder, and 45% of 5-6μm aluminum powder according to the mass percentage, the total amount is 100%, and mix them evenly to obtain a mixed aluminum powder.

[0051] 3, the preparation of V2O5 powder: with embodiment 2

[0052] 4, alumin...

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Abstract

The invention discloses a high-performance back surface field paste for a crystalline silicon solar cell, belonging to the technical field of back surface field pastes of solar cells. The invention provides a high-performance back surface field aluminum paste for a crystalline silicon solar cell. The aluminum paste is free of lead and good in screening performance, a silicon wafer has small warping degree after being sintered, an aluminum film is free of an aluminum bead and an aluminum lump and good in compactness and electrical conductivity, the aluminum film and a cell slice are highly adhered, the cell slice has high conversion efficiency, and meanwhile the aluminum film has good stability. The aluminum paste comprises the following components in parts by weight: 65-75 parts of spherical metal aluminum powder, 20-30 parts of an organic carrier, 1-5 parts of bismuth glass powder, 0.1-1 part of metal oxide and 1-3 parts of aluminum-silicon alloy powder, wherein the purity of the spherical metal aluminum powder is greater than 99.8%; the organic carrier comprises the following components in parts by weight: 30-50 parts of terpilenol, 2-7 parts of ethyl cellulose, 0.1-5 parts of high molecular resin, 1-7 parts of a dispersing agent and 25-70 parts of an additive. The aluminum paste is mainly applied to the back surface field pastes of the solar cells.

Description

technical field [0001] The invention discloses a high-performance crystalline silicon solar cell back field slurry, which belongs to the technical field of solar cell back field slurry. Background technique [0002] Solar energy is an inexhaustible, pollution-free, noise-free new energy source. Silicon solar cells are currently mature, green and environmentally friendly materials that can directly convert solar energy into electrical energy. Aluminum paste, as the main raw material for making the back electric field, has the advantages of cheap price, stable performance, good aging resistance, and easy to form ohmic contact with silicon, etc. advantages and are widely used. As a material with strong applicability, a lot of research has been done on the preparation technology of aluminum paste at home and abroad, and a lot of patents have been applied for. Foreign aluminum paste manufacturers mainly include DuPont, Fulu, etc. Domestic aluminum paste manufacturers mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
Inventor 任永华张伟贾进莉赵亮富
Owner 山西盛驰科技有限公司
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