Doping type solar cell front silver paste

A technology for solar cells and silver paste, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials. It can solve problems such as insufficient bonding and reduce sheet resistance, bonding performance and electrode The electrical properties are uniform and the bonding strength is enhanced.

Active Publication Date: 2014-02-05
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this silver paste technology is that the bond with the silicon substrate is not strong enough

Method used

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  • Doping type solar cell front silver paste

Examples

Experimental program
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Effect test

Embodiment 1~5

[0021] The present invention is a doped solar cell front silver paste. The components and weight percentages of the paste in Examples 1-5 are shown in Table 1.

[0022] Table 1:

[0023]

[0024] In embodiment 1~5, the tap density of silver powder is 4.5-5.5g / cm 3 , the average particle size is 1~3μm. The glass powder is a glass system of lanthanum, boron, and zinc, with an average particle size of 1-3 μm. The sintering accelerator is compound A(Zn(CH 3 (CH 2 ) 16 COO) 2 ), where A contains the element indium In.

[0025] In embodiment 1, the composition of glass powder and percentage by weight thereof are: La 2 o 3 0.5%, B 2 o 3 85%, Al 2 o 3 2%, ZnO2%, Na 2 O1%, LiO 2 3%, V 2 o 5 6% and P 2 o 5 0.5%. Compound A(Zn(CH 3 (CH 2 ) 16 COO) 2 ), A is elemental indium In, the compound A (Zn(CH 3 (CH 2 ) 16 COO) 2 ) is obtained by the following method: take zinc stearate Zn(CH 3 (CH 2 ) 16 COO) 2 Dissolve the raw materials in a solvent, add raw mate...

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Abstract

The invention relates to a doping type solar cell front silver paste. The composition and weight percentage of the paste is 75% to 90% of silver powder, 1% to 8% of glass powder, 1.5% to 4% of organic binder, 0.1 % to 10% of compound containing indium and zinc, 0% to 1% of dispersing agent, and a solvent as a surplus, wherein the glass powder is la, boron, and zinc glass system, the compound containing indium and zinc is A(Zn(CH3(CH2)16COO)2), and A comprises the element In. According to the doping type solar cell front silver paste, since the la, boron, and zinc glass system glass powder is employed, the compound containing indium and zinc is added at the same time, the bonding strength between an electrode and a silicon substrate is strengthened, and the series resistance and sheet resistance are reduced. At the same time, in the compound containing indium and zinc, a zinc component is hard zinc stearate, the effect of surface tension of a contact interface between the compound containing indium and zinc and the organic binder and the solvent, and the electric performance of the electrode is more uniform.

Description

technical field [0001] The invention relates to a silver paste, in particular to a front silver paste for a doped solar cell. Background technique [0002] Silver paste for electrode materials of solar cells is a very critical technical point in the production of solar cells. Silver paste mainly relies on three processes of screen printing, low-temperature drying, and high-temperature sintering to make electrodes. [0003] At present, the front-side silver paste for the front electrode of the solar cell in the prior art is mainly composed of an organic vehicle, silver powder, glass powder and additives. For example: the silver paste of the Chinese patent with application number 20111016989.3 includes 63~80% silver powder, 4~9% glass powder, 12~28% organic vehicle, 1~2% additive and 1~2% dispersant, among which, the additive is Lanthanum oxide powder, the particle size is less than 5 μm, the dispersant is bismuth stearate, and the glass powder is boron-bismuth-silicon-alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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