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Solar cell front-side silver paste and preparation method thereof

A solar cell and silver paste technology, applied in the field of solar cells, can solve the problems of reducing the sintering degree of glass powder and silicon wafer, poor sintering performance of grid line and silicon wafer, and low conversion efficiency of front silver paste, so as to simplify the preparation of silver paste Process, large welding tension, the effect of high welding tension

Active Publication Date: 2013-03-27
SHANGHAI TRANSCOM ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tellurate glass frits are less corrosive to silicon wafers because of their low lead content. Although they meet the requirements of high square resistance, they reduce the degree of sintering between glass frits and silicon wafers, thereby reducing the welding tension.
Therefore, one defect of the silver paste prepared by tellurite glass powder is that the sintering performance of the grid line and the silicon wafer is poor.
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 this invention is low and it is difficult to commercialize

Method used

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  • Solar cell front-side silver paste and preparation method thereof

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Embodiment 1

[0030] A solar cell front silver paste, comprising the following components in weight percentage: 87% silver powder with an average particle size of 1.5 μm, 2.9% lead-containing glass powder with an average particle size of 1.5 μm, 0.1% TeO with an average particle size of 1 μm 2 Micropowder, 10% organic vehicle; wherein the organic vehicle comprises the following components accounting for the weight percentage of the organic vehicle: 10% ethyl cellulose resin, 4% rosin resin, 6% phenolic resin, 80% organic solvent (50% terpineol, 22% ethylene glycol monobutyl ether acetate, 28% propylene glycol methyl ether acetate), the mass percentage of lead in the lead-containing glass powder is 75% to 80%.

[0031] The preparation method of the battery front silver paste of described embodiment 1 comprises the following steps:

[0032] (1) Preparation of organic vehicle: Add 10g of ethyl cellulose resin, 4g of rosin resin, and 6g of phenolic resin to 80ml of organic solvent (a mixture of...

Embodiment 2

[0037]A solar cell front silver paste, comprising the following components in weight percentage: 89% silver powder with an average particle size of 1 μm, 2.5% lead-containing glass powder with an average particle size of 1.2 μm, 0.5% TeO with an average particle size of 0.3 μm 2 Micropowder, 8% organic vehicle; Wherein said organic vehicle comprises the following components that occupy organic vehicle weight percent: 10% ethyl cellulose resin, 5% rosin resin, 2% phenolic resin, 83% organic solvent (50% pine oil Alcohol, 22% ethylene glycol monobutyl ether acetate, 28% propylene glycol methyl ether acetate mixture), the mass percentage of lead in the lead-containing glass powder is 80% to 85%, and the TeO 2 The purity of micro powder is greater than 99.9%.

[0038] The preparation method of the battery positive silver paste of described embodiment 2 comprises the following steps:

[0039] (1) Preparation of organic vehicle: Add 10g of ethyl cellulose resin, 5g of rosin resin, ...

Embodiment 3

[0044] A solar cell front silver paste, comprising the following components in weight percentage: 87% silver powder with an average particle size of 3 μm, 3% lead-containing glass powder with an average particle size of 5 μm, 3% TeO with an average particle size of 2 μm 2 Micropowder, 7% organic vehicle; Wherein said organic vehicle comprises the following components occupying the weight percentage of organic vehicle: 7% ethyl cellulose resin, 5% rosin resin, 88% organic solvent (50% terpineol, 22% ethyl alcohol The mixture of glycol monobutyl ether acetate and 28% propylene glycol methyl ether acetate), the mass percentage of lead in the lead-containing glass powder is 70% to 75%, and the TeO 2 The purity of micro powder is greater than 99.9%.

[0045] The preparation method of the battery front silver paste of described embodiment 3 comprises the following steps:

[0046] (1) Preparation of organic vehicle: Add 7g ethyl cellulose resin and 5g rosin resin to 88ml organic sol...

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Abstract

The invention provides solar cell front-side silver paste and a preparation method thereof. The solar cell front-side silver paste comprises the following components by weight: 80-90% of silver powder, 0.5-5% of leaded glass powder, 0.05-3% of inorganic additive and 5-15% of organic carrier, wherein the percentage mass content of lead in the leaded glass powder is 30-90%, the inorganic additive comprises TeO2 micro powder, and the organic carrier comprises resin and organic solvent. The silver paste is applied to the surface of the high-square-resistance silicon-based solar cell and can form good ohmic contact on the high-square-resistance silicon-based solar cell. Therefore, conversion efficiency of the solar cell is greatly improved, and welding tensile force of the high-lead silver paste subjected to sintering on the solar cell is remained. Besides, by means of the preparation of the solar cell front-side silver paste, the preparation process of the silver paste is greatly simplified, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a front silver paste of a solar cell 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 electrodes of the battery. The front electrode directly affects the serie...

Claims

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Application Information

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