Doping type solar cell front silver paste

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...

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