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Lead-free silver conductive paste used for positive electrode of solar battery and preparation technique thereof

A technology for solar cells and front electrodes, applied in the direction of conductors, conductive materials dispersed in non-conductive inorganic materials, conductive materials, etc. Solve problems such as low slurry adhesion, achieve good contact, ensure fineness, and improve electrical properties

Inactive Publication Date: 2010-12-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measured slurry adhesion is low. This is because the adhesion of the slurry is mainly determined by the nature and content of the glass powder. The improvement of the organic carrier only plays an auxiliary role in the adhesion. Therefore, optimizing the organic The carrier does not fundamentally improve the adhesion of the slurry
[0008] Patent CN101271929A discloses a lead-free silver conductor paste for the front electrode of solar cells, but the square resistance of the prepared paste is relatively high, and only part of the performance of the paste has been measured, and its application to solar energy is not given. Overall performance after battery

Method used

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  • Lead-free silver conductive paste used for positive electrode of solar battery and preparation technique thereof
  • Lead-free silver conductive paste used for positive electrode of solar battery and preparation technique thereof
  • Lead-free silver conductive paste used for positive electrode of solar battery and preparation technique thereof

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Experimental program
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Effect test

Embodiment 1

[0037] 1) Accurately weigh 20g SiO2, 5g B2O3, 40g Bi2O3, 5g Al2O3, 10g TiO2, 20g ZnO six oxide powders, put them into an alumina crucible for melting, the melting temperature is 1400°C, and the holding time is 30min. Ball milling after water quenching, drying and sieving to obtain glass powder with a particle size of 5 μm;

[0038] 2) Fully mix 82.7g of silver powder, 2g of glass powder, and 0.5g of zinc resinate in a mixer for 50 minutes, wherein the particle size D50 of silver powder is about 2 μm, and the particle size of zinc resinate is about 2 μm;

[0039] 3) Accurately weigh 15.3 g of organic solvent and various additives, mix them, and fully stir in a constant temperature water bath to form an organic carrier. The temperature of the water bath is 70°C, and the stirring time is 60 minutes;

[0040] 4) The mixed solid powder is mixed with the organic carrier, and fully ground with a three-roll mill to obtain the desired slurry.

[0041] The resulting slurry was printed ...

Embodiment 2

[0043] 1) Accurately weigh 20g SiO2, 5g B2O3, 40g Bi2O3, 5g Al2O3, 10g TiO2, 20g ZnO six oxide powders, put them into an alumina crucible for melting, the melting temperature is 1400°C, and the holding time is 30min. Ball milling after water quenching, drying and sieving to obtain glass powder with a particle size of 5 μm;

[0044] 2) Fully mix 85g of silver powder, 3.0g of glass powder, and 0.8g of zinc resinate in a mixer for 50 minutes, wherein the particle size D50 of silver powder is about 1 μm, and the particle size of zinc resinate is about 1 μm;

[0045] 3) Accurately weigh 17g of organic solvent and various additives, mix them, and fully stir in a constant temperature water bath to form an organic carrier. The temperature of the water bath is 70°C, and the stirring time is 60 minutes;

[0046] 4) The mixed solid powder is mixed with an organic carrier, and fully ground with a three-roll mill to obtain the required slurry.

[0047] The resulting slurry was printed on ...

Embodiment 3

[0049] 1) Accurately weigh 20g SiO2, 5g B2O3, 40g Bi2O3, 5g Al2O3, 10g TiO2, 20g ZnO six oxide powders, put them into an alumina crucible for melting, the melting temperature is 1400°C, and the holding time is 30min. Ball milling after water quenching, drying and sieving to obtain glass powder with a particle size of 5 μm;

[0050] 2) Mix 85g of silver powder, 2.5g of glass powder, and 0.8g of zinc resinate in a mixer for 50 minutes, wherein the particle size D50 of silver powder is about 1 μm, and the particle size of zinc resinate is about 5 μm.

[0051] 3) Accurately weigh 17g of organic solvent and various additives, mix them, and fully stir in a constant temperature water bath to form an organic carrier. The temperature of the water bath is 70°C, and the stirring time is 60 minutes;

[0052] 4) The mixed solid powder is mixed with an organic carrier, and fully ground with a three-roll mill to obtain the desired slurry.

[0053] The resulting slurry was printed on a singl...

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Abstract

The invention provides a lead-free silver conductive paste used for positive electrode of solar battery and a preparation technique thereof. The paste comprises the following materials by weight percentage: 65 to 85 percent of silver powder, 2 to 8 percent of lead-free glass powder, 10 to 25 percent of organic carrier and 0.1 to 3 percent of additive. The paste adopts the lead-free glass powder of Si-B-Bi-Al-Ti-Zn-O series to replace the traditional lead-bearing glass powder; and the series glass powder has lower softening point, can lead the silver electrode to have good adhesive force aftersintering, and ensures the silver electrode to be well contacted with a silicon substrate. In addition, zinc resinate is used as the additive in the invention, not only can well improve the printing performance of the paste, but also can improve the electrical property of the electrode.

Description

technical field [0001] The invention relates to a lead-free silver conductor paste for a front electrode of a solar cell and a preparation process thereof. Background technique [0002] Solar energy is an inexhaustible clean energy source. With the depletion of non-renewable energy sources such as coal and oil, the development and utilization of solar energy has become a hot spot in recent years. A solar cell is a semiconductor device that converts solar energy into electrical energy, and it will become one of the important means of utilizing solar energy. [0003] Solar cells can be divided into many different types according to different materials, such as crystalline silicon solar cells, thin-film solar cells, compound semiconductor thin-film solar cells, and photoelectrochemical solar cells. At present, crystalline silicon solar cells are the leading products in the market, and their photoelectric conversion efficiency is relatively high. The basic structure of a cryst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/18H01B1/00H01B1/02H01B1/16H01B1/22
CPCY02P70/50
Inventor 甘卫平张金玲向锋周华郭桂全刘欢
Owner CENT SOUTH UNIV
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