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Lead-free Al-back-surface-field (BSF) paste for crystalline silicon solar battery and preparation method thereof

A solar cell, lead-free aluminum back field technology, applied in the direction of circuits, electrical components, semiconductor devices, etc., can solve the problems that cannot meet the requirements of high-viscosity printing, low cell warpage, high back field adhesion, etc. Achieve high battery conversion efficiency, improve screen performance, and improve printing performance

Active Publication Date: 2009-11-18
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (3) The organic adhesive contains low-toxic substances, which are harmful to the human body; and its preparation method has a low degree of industrialization, serious solvent volatilization, serious air pollution, and low efficiency
[0012] (4) The aluminum back field paste for crystalline silicon solar cells has a high square resistance on the alumina substrate, and cannot form a good ohmic contact with the silicon substrate, making the cell conversion efficiency low
[0013] (5) The paste has poor thixotropy and cannot meet the requirements of high-viscosity printing
[0014] (6) The requirements of low cell warpage and high back field adhesion cannot be met at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1 Preparation of lead-free glass powder

[0029] SiO 2 3 copies, B 2 o 3 25 copies, Al2 o 3 2 copies, Bi 2 o 3 45 copies, P 2 o 5 4 parts, ZnO 15 parts and Zn 3 (PO 4 ) 2 4H 2 6 parts of O, mixed evenly with a mixer, put into a porcelain crucible, dried in an oven at 130°C for 3.5h, put into a high-temperature furnace, smelted at 900°C for 1h, dried after water quenching, and ball milled to less than 10μm.

[0030] 2 Preparation of organic binder

[0031] 3 parts by mass of ethyl cellulose, 3 parts of benzyl alcohol, 40 parts of terpineol, 20 parts of tributyl citrate, 12 parts of acetyl tributyl citrate, 15 parts of butyl carbitol acetate, castor oil 5 parts, 2 parts phenolic resin, after mixing the above materials, heat and stir to dissolve in the reaction kettle at 80-120 ℃, and obtain a transparent and uniform organic adhesive.

[0032] 3 Aluminum powder: the commercially available purity is 99.82 parts, the average particle size is 4.2 μm, the alu...

Embodiment 2

[0041] 1 Preparation of lead-free glass powder

[0042] parts by mass SiO 2 3 copies, B 2 o 3 15 copies, Al 2 o 3 1 copy, Bi 2 o 3 60 copies, P 2 o 5 3 parts, ZnO 10 parts and Zn 3 (PO 4 ) 2 4H 2 8 parts of O, mixed evenly with a mixer, put into a porcelain crucible, dried in an oven at 130°C for 3.5h, put into a high-temperature furnace, smelted at 950°C for 1h, dried after water quenching, and ball milled to less than 10μm.

[0043] 2 Preparation of organic binder

[0044] 2 parts by mass of ethyl cellulose, 5 parts of benzyl alcohol, 20 parts of terpineol, 30 parts of tributyl citrate, 10 parts of acetyl tributyl citrate, 26 parts of butyl carbitol acetate, castor oil 2 parts, 5 parts of phenolic resin, the above substances are heated and stirred at 80-120 ℃ in the reaction kettle to dissolve, and a transparent and uniform organic adhesive is obtained.

[0045] 3 aluminum powder: specification is the same as embodiment 1.

[0046] 4 zirconia powder: the ...

Embodiment 3

[0053] 1 Preparation of lead-free glass powder

[0054] parts by mass SiO 2 2.5 servings, B 2 o 3 20 copies, Al 2 o 3 1 copy, Bi 2 o 3 40 copies, P 2 o 5 5 parts, ZnO 20 parts and Zn 3 (PO 4 ) 2 4H 2 11.5 parts of O, mixed evenly with a mixer, put into a porcelain crucible, dried in an oven at 130°C for 3.5h, put into a high temperature furnace, melted at 900°C for 1h, dried after water quenching, and ball milled to less than 10μm.

[0055] 2 Preparation of organic binder

[0056] 5 parts by mass of ethyl cellulose, 3.5 parts of benzyl alcohol, 50 parts of terpineol, 10 parts of tributyl citrate, 20 parts of acetyl tributyl citrate, 8 parts of butyl carbitol acetate, castor oil 3 parts, 0.5 parts of phenolic resin, the above substances are heated and stirred at 80-120 ℃ in the reaction kettle to dissolve, and a transparent and uniform organic adhesive is obtained.

[0057] 3 aluminum powder: specification is the same as embodiment 1.

[0058] 4 zirconia pow...

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Abstract

The invention provides a lead-free Al-back-surface-field (BSF) paste for a crystalline silicon solar battery and a preparation method thereof. The paste is made of 72-82 parts of aluminium powder, 0.1-2 parts of zirconia powder, 0.1-5 parts of inorganic bonding agent, 15-25 parts of organic bonding agent and 1-3 parts of auxiliary agent. After being processed by screen painting and sintering, the paste forms Al-BSF on a silicon chip, the BSF and the silicon chip form good ohmic contact and have good adhesive attraction; an aluminum film does not fall off, the battery has high transfer efficiency, and a battery piece has low warpage.

Description

technical field [0001] The invention relates to an electronic paste for a crystalline silicon solar cell, in particular to a lead-free aluminum back field paste for a crystalline silicon solar cell, and meanwhile, the invention also relates to a preparation method of the paste. Background technique [0002] With the increasing shortage of traditional energy sources, the photovoltaic industry represented by crystalline silicon solar cells has ushered in rapid development. The price of crystalline silicon, the main raw material of crystalline silicon solar cells, remains high. In order to effectively reduce the power generation cost of crystalline silicon solar cells, we need to improve the use efficiency of crystalline silicon. At present, the method of reducing the thickness of silicon wafers is widely used to improve the use efficiency of crystalline silicon , Now generally use crystalline silicon wafers with an original thickness of 180±20μm to make solar cells. Improving...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01B1/02H01L31/18
CPCY02P70/50
Inventor 丁冰冰卓曼仪倪妙妮马进毛毅强
Owner GUANGZHOU RUXING TECH DEV
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