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Front silver paste for high sheet resistance silicon-based solar cell and preparing method of front silver paste

A solar cell, high square resistance technology, applied in the field of solar cells, can solve the problems of reducing glass powder and silicon wafer sintering, low paste welding tension, poor silicon wafer corrosion, etc., to improve conversion efficiency, maintain welding tension, expand Effect of sintering temperature

Active Publication Date: 2014-07-09
SHANGHAI TRANSCOM ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low lead content of tellurate glass powder has poor corrosion resistance to silicon wafers, which reduces the sintering of glass powder and silicon wafers. Therefore, the paste prepared from tellurate glass powder has low welding tension, which is difficult to meet the requirements of silicon-based solar cells. needs
The use of lead-free glass powder and inorganic additive TeO is disclosed in the patent US7935279 2 and Bi 2 o 3 Prepare the front silver paste of solar cells, but the conversion efficiency of the front silver paste prepared by using this invention is low, and it is difficult to commercialize

Method used

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  • Front silver paste for high sheet resistance silicon-based solar cell and preparing method of front silver paste

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Embodiment 1

[0034] A solar cell front silver paste, comprising the following components in weight percentage: 88% silver powder, 3% glass powder, 9% organic vehicle, wherein the glass powder contains the following components in glass powder weight percentage: 30% TeO 2 , 30%PbO, 2.5%Na 2 O, 5.0%Bi 2 o 3 , 6.5%B 2 o 3 , 5.0%ZnO, 6.0%Al 2 o 3 , 10%SiO2 2 , 2.0%Sb 2 o 3 , 3.0%Li 2 O, the organic vehicle comprises the following components accounting for the weight percentage of the organic vehicle: 8% ethyl cellulose resin, 5% rosin resin, 5% phenolic resin, 82% organic solvent (50% terpineol, 22% ethylene glycol Alcohol monobutyl ether acetate, 28% propylene glycol methyl ether acetate mixture).

[0035] The preparation method of the battery front silver paste of described embodiment 1 comprises the following steps:

[0036] (1) Preparation of organic vehicle: Add 8g ethyl cellulose resin, 58g rosin resin, and 5g phenolic resin to 82ml organic solvent (50% terpineol, 22% ethylene ...

Embodiment 2

[0041] A solar cell front silver paste, comprising the following components in weight percentage: 83% silver powder, 2% glass powder, 15% organic vehicle, wherein the glass powder contains the following components in glass powder weight percentage: 40% TeO 2 , 20%PbO, 15%Na 2 O, 5.0%Bi 2 o 3 , 3%B 2 o 3 , 7.0%ZnO, 4.0%Al 2 o 3 , 4.5%SiO2 2 , 1.5%Sb 2 o 3 , the organic vehicle comprises the following components occupying the weight percentage of the organic vehicle: 9% ethyl cellulose resin, 2% rosin resin, 6% phenolic resin, 83% organic solvent (50% terpineol, 22% ethylene glycol Monobutyl ether acetate, 28% mixture of propylene glycol methyl ether acetate).

[0042] The preparation method of the battery positive silver paste of described embodiment 2 comprises the following steps:

[0043] (1) Preparation of organic vehicle: Add 9g ethyl cellulose resin, 2g rosin resin, 6g phenolic resin to 83ml organic solvent 45% terpineol, 25% ethylene glycol monobutyl ether acet...

Embodiment 3

[0048] A solar cell front silver paste, comprising the following components in weight percentage: 89% silver powder, 3% glass powder, 8% organic vehicle, wherein the glass powder contains the following components in glass powder weight percentage: 43% TeO 2 , 37%PbO, 10%Na 2 O, 5.0%Bi 2 o 3 , 2.5%ZnO, 2.5%SiO 2 , the organic vehicle comprises the following components occupying the weight percentage of the organic vehicle: 7% ethyl cellulose resin, 2% rosin resin, 6% phenolic resin, 85% organic solvent (50% terpineol, 22% ethylene glycol Monobutyl ether acetate, 28% mixture of propylene glycol methyl ether acetate).

[0049] The preparation method of the battery front silver paste of described embodiment 3 comprises the following steps:

[0050] (1) Preparation of organic vehicle: Add 7g ethyl cellulose resin, 2g rosin resin, 6g phenolic resin to 85ml organic solvent (50% terpineol, 22% ethylene glycol monobutyl ether acetate, 28% propylene glycol Methyl ether acetate mixt...

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Abstract

The invention provides a front silver paste for a high sheet resistance silicon-based solar cell and a preparing method of the front silver paste. The front silver paste is composed of, by weight, 80% to 90% of silver powder, 0.5% to 6% of glass powder and 5% to 15% of organic carriers. The glass powder is composed of, by weight, 25% to 75% of TeO2, 20% to 55% of PbO and 1% to 20% of Na2O. The organic carriers include resin and organic solvents. The silver paste is suitable for the high sheet resistance silicon-based solar cell and can make good ohmic contact with the high sheet resistance silicon-based solar cell, and therefore the conversion efficiency of the solar cell is greatly improved; meanwhile, the silver paste can keep welding pulling force obtained after high-lead silver paste is sintered on the solar cell by adjusting the content of Na2O, the sintering temperature range is effectively widened, and stability of product performance is ensured.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a silver paste for the front surface of silicon-based solar cells with high square resistance on the surface and a preparation method thereof. Background technique [0002] With the shortage of traditional energy sources such as coal, oil, and natural gas and people's concern about carbon dioxide emissions, solar power generation technology has developed by leaps and bounds. Among them, crystalline silicon solar cell technology, as the main body of solar power generation technology, has always attracted people's attention. Through continuous research on crystalline silicon solar cell technology, its photoelectric conversion efficiency has been continuously improved. [0003] In addition to the carrier concentration, distribution and mobility in the crystalline silicon material used, the quality of solar cells is also affected by the performance of the positive and negative el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCY02P70/50
Inventor 张俊刚杨建平
Owner SHANGHAI TRANSCOM ELECTRONICS TECH
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