Method for preparing solar cell front silver paste slurry

A solar cell and silver paste technology, which is applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of silver powder performance, batch consistency, batch stability and production scale that cannot meet customer needs and other problems, to achieve the effect of good leveling and thixotropy, strong thick film adhesion, and suitable viscosity

Inactive Publication Date: 2018-01-05
扬中市润宇电力设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, there is still a big gap between the technical level of front silver packaging and related materials of solar cells in my country and the international level, especially in terms o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1, the preparation of silver powder: accurately weigh and dissolve a certain amount of silver nitrate with ultrapure water, add gelatin, adjust the pH value to 4 with the ammoniacal liquor of 28wt%, then dilute to certain volume, make silver nitrate concentration be 0.2mol L -1 , The gelatin concentration is 5wt%. Accurately weigh and dissolve a certain amount of ascorbic acid with ultrapure water, adjust the pH value to 4 with 28wt% ammonia water, and then dilute to a certain volume so that the concentration of ascorbic acid is 1.8mol L -1 . Add the silver nitrate solution dropwise to the stirring reducing agent solution while stirring at 200rpm, the dropping rate is 0.7mL·s -1 , continue to stir, keep the temperature at 50°C, and continue to stir for 3 minutes after the dripping is completed. Separate the solid and liquid with a centrifuge, stir and wash the precipitate with ultrapure water three times, and wash the precipitate with absolute ethanol three times, put...

Embodiment 2

[0040] I, the preparation of silver powder: accurately weigh and dissolve a certain amount of silver nitrate with ultrapure water, add gelatin, adjust the pH value to 3 with concentrated nitric acid, then dilute to a certain volume, so that the concentration of silver nitrate is 0.3mol L -1 , The gelatin concentration is 10wt%. Accurately weigh and dissolve a certain amount of ascorbic acid with ultrapure water, adjust the pH value to 3 with 28wt% concentrated nitric acid, and then dilute to a certain volume so that the concentration of ascorbic acid is 1.2mol L -1 . Add the silver nitrate solution dropwise to the stirring reducing agent solution while stirring at 250rpm, the dropping rate is 0.6mL·s -1 , continue to stir, the temperature is maintained at 45 ° C, and continue to stir for 4 minutes after the drop is completed. Separate the solid and liquid with a centrifuge, stir and wash the precipitate with ultrapure water three times, and wash the precipitate with absolute...

Embodiment 3

[0047] 1, the preparation of silver powder: accurately weigh and dissolve a certain amount of silver nitrate with ultrapure water, add gelatin, adjust pH value to 5 with 28wt% ammoniacal liquor, then dilute to certain volume, make silver nitrate concentration be 0.4mol L -1 , The gelatin concentration is 8wt%. Accurately weigh and dissolve a certain amount of ascorbic acid with ultrapure water, adjust the pH value to 5 with 28wt% ammonia water, and then dilute to a certain volume so that the concentration of ascorbic acid is 1.1mol L -1 . Add the silver nitrate solution dropwise to the stirring reducing agent solution while stirring at 150rpm, the dropping rate is 0.7mL·s -1 , continue to stir, keep the temperature at 55°C, and continue to stir for 5 minutes after the dripping is completed. Separate the solid and liquid with a centrifuge, stir and wash the precipitate with ultrapure water three times, and wash the precipitate with absolute ethanol three times, put it in a va...

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Abstract

The present invention relates to a kind of method of preparing solar cell positive silver paste slurry: 1, the preparation of silver powder: (1) ultrapure water dissolves silver nitrate, adds dispersant, adjusts pH to 3-5; (2) ultrapure water dissolves Reductant, adjust the pH to 3-5; (3) Add silver nitrate solution to the reducing agent solution for reaction at a temperature of 45-55°C, centrifuge to collect the precipitate after fully reacting; (4) Wash and dry the precipitate to obtain silver powder; II, Preparation of organic vehicle: Mix solvent, thickener and thixotropic agent, heat in a water bath at 75-85°C, stir to dissolve, let stand and cool to room temperature; III. Preparation of front silver paste: Now mix silver powder and glass powder evenly , then add the organic vehicle and mix evenly, and grind until the fineness reaches the required value. The slurry prepared by the invention has suitable viscosity, good leveling and thixotropy, good chemical stability, and long storage period. The prepared slurry has strong ability to penetrate the anti-reflection film, and the formed thick film has strong adhesion and good ohmic contact. , the resulting battery sheet should have good electrical properties.

Description

technical field [0001] The invention belongs to the field of solar cell manufacturing, and in particular relates to a method for preparing a front silver paste of a solar cell. Background technique [0002] For the silver powder used for the front silver packaging of solar cells, the particle size of micron or submicron is generally required. The research on ultra-fine silver powder at home and abroad has been relatively in-depth. There are a large number of literature reports. Nano is less used. Although nano-silver powder is rarely used in solar cells due to its easy agglomeration, its preparation method has great reference value for the preparation of micron / submicron silver powder. Foreign research on silver powder for solar cells has been relatively mature; while domestically produced silver powders have a certain range of sizes and shapes, but most of them have poor dispersion, severe agglomeration, and low tap density. There is still a considerable distance from th...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 司剑
Owner 扬中市润宇电力设备有限公司
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