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Solar cell positive silver paste suitable for high-temperature sintering

A solar cell and silver paste technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of destroying P-N junctions, low sintering yield, easy penetration of glass powder, etc., to reduce series resistance, The effect of improving the yield and improving the conversion efficiency

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

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Problems solved by technology

Chinese patent document 200810025430.3 discloses a high-viscosity solar cell front silver paste that can be sintered at 850-900°C. However, the silver paste formula contains too much glass powder, up to 10%. Penetrate the emitter area, and even destroy the P-N junction, resulting in low sintering yield

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  • Solar cell positive silver paste suitable for high-temperature sintering
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Embodiment 1～6

[0021] The present invention is a solar cell front silver paste suitable for high-temperature sintering. The components and weight percentages of the paste in Examples 1-6 are shown in Table 1.

[0022] In embodiment 1, silver powder is spherical, particle diameter<5 μ m; Sintering accelerator is rhodium simple substance; Described solvent is butyl carbitol or butyl carbitol acetate; Organic binder is ethyl cellulose, hydroxy Methyl cellulose or nitrocellulose; the glass powder is leaded glass powder, the softening temperature is 580-680 ℃, the particle size is <2μm, and its composition and weight percentage are: lead oxide 60%, zinc oxide 10%, aluminum oxide 5%, boric acid 5%, silicon oxide 15%, zirconium oxide 2%, and titanium oxide 3%.

[0023] In Example 2, the silver powder is spherical and has a particle size of 1 to 3 μm; the sintering accelerator is a rhodium-containing compound, preferably an oxide, chloride or sulfide of rhodium; the solvent is tributyl citrate or tr...

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Abstract

The invention relates to solar cell positive silver paste suitable for high-temperature sintering. The paste comprises, by weight, 70-90% of silver powder, 1-3% of glass powder, 5-15% of solvent, 3-10% of organic binding agents and 0.01-2% of sintering accelerant, wherein the silver powder is of a spherical shape, the particle size of the silver powder is not larger than 5 micrometers, and the preference particle size of the silver powder is 1-3 micrometers. Compared with the prior art, an elementary substance containing rhodium or ruthenium or iridium or compounds containing rhodium or ruthenium or iridium serve as the sintering accelerant, the sintering accelerant can effectively restrain excessive sintering of the silver powder at a high temperature, crystalline of silver is prevented from being diffused to a junction area, generation of branch junctions is prevented, and the rate of finished products of battery pieces is increased. The sintering temperature of the paste is 800-900 DEG C, taking the 15 micrometers sintering thickness as an example, electric conductivity of the positive silver paste is 2m*omega / sq, the positive silver paste has excellent weldability, and adhesive force between a (2*2mm<2>) silver layer and a silicon substrate can reach more than 3N.

Description

technical field [0001] The invention relates to a silver paste, in particular to a solar cell front silver paste suitable for high-temperature sintering. Background technique [0002] Sintering is one of the important parameters affecting the performance of silver paste. According to the sintering temperature, silver paste can be divided into high-temperature sintered silver paste, medium-temperature sintered silver paste and low-temperature sintered silver paste. Among them, the sintering temperature of high-temperature sintered silver paste is about 750-900°C; compared with medium-temperature or low-temperature sintered silver paste, high-temperature sintered silver paste is characterized by outstanding solder resistance and aging resistance. High-temperature sintered silver paste has an important application in solar cells; compared with medium-temperature or low-temperature sintered silver paste, it can improve the pass rate of the early welding process and the later se...

Claims

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Application Information

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