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Electrode silver paste for front surface of crystalline silicon solar cell

A technology of solar cells and crystalline silicon, applied in conductive materials, circuits, photovoltaic power generation and other directions dispersed in non-conductive inorganic materials, can solve the problem of incomplete coating of silver powder particles, decreased EL yield of paste, and incomplete coating of silver powder. and other problems, to achieve the effect of improving the selection range, high photoelectric conversion efficiency, and stable EL yield.

Pending Publication Date: 2021-12-31
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the resin and solvent are dissolved at a certain temperature and then mixed with other raw materials such as silver powder, glass powder and other raw materials. It is common that the coating of the silver powder by the resin is not complete, or the surface of some silver powder is not covered by resin due to uneven mixing. Partial silver particles are separated from the system during long-term use, resulting in technical problems such as EL yield decline
[0003] In view of the above technical defects, the present invention provides a silver paste for electrodes (fine grid and printing) on ​​the front side of crystalline silicon solar cells and a preparation method thereof, which can effectively solve the problem of incomplete coating of silver powder particles by organic resins; solve the problem of conventional organic manufacturing systems For the problem of EL yield drop during the long-term use of the paste, and the problem of poor aspect ratio in the process of fine line printing

Method used

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  • Electrode silver paste for front surface of crystalline silicon solar cell
  • Electrode silver paste for front surface of crystalline silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Resin dissolution:

[0057] Dissolve the acrylic resin in an ethanol solvent (100L), control the concentration of the resin to 0.1%, heat the temperature at 100°C, stir for 60 minutes, and stir at a speed of 2000r / min to obtain the dissolved resin;

[0058] 2. Silver powder package:

[0059] After the resin is fully dissolved, add silver powder to the solution. The ratio of silver powder to resin is 200:1. Set the temperature at 80°C and stir at 2000r / min for 60 minutes. During this process, the resin will fully wrap the surface of the silver powder.

[0060] 3. Resin shaping:

[0061] After the coating is completed, set the temperature at 300°C and continue stirring to volatilize the solvent in the mixture, stir for 40 minutes (when about 80% of the volatilization is completed), and stop stirring. The slurry of silver powder, resin and solvent was placed in a tray, dried in a vacuum oven at 80° C. for 1 hour, and then cooled to room temperature to set the resin. ...

Embodiment 2

[0068] Embodiment 2 (ratio of silver powder and resin)

[0069] 1. Resin dissolution:

[0070] Dissolve the acrylic resin in an ethanol solvent (100L), control the resin concentration to 0.1%, heat at 100°C, stir for 60 minutes, and stir at a speed of 2000r / min to obtain the dissolved resin;

[0071] 2. Silver powder package:

[0072] After the resin is fully dissolved, add silver powder to the solution. The ratio of silver powder to resin is 100:1. Set the temperature at 80°C and stir at 2000r / min for 60 minutes. During this process, the resin will fully wrap the surface of the silver powder.

[0073] 3. Resin shaping:

[0074] After the coating is completed, set the temperature at 300°C and continue stirring to volatilize the solvent in the mixture, stir for 40 minutes (when about 80% of the volatilization is completed), and stop stirring. The slurry of silver powder, resin and solvent was placed in a tray, dried in a vacuum oven at 80° C. for 1 hour, and then cooled to r...

Embodiment 3

[0080] According to the method of Example 1, the difference is only in step 1: dissolving methyl cellulose in alcohol ester twelve solvent (100L), controlling the concentration of resin to 0.1%, heating temperature 100°C, stirring time 60 minutes, stirring speed 2000r / min, obtain the resin of dissolving; Other steps are identical with embodiment 1.

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Abstract

The invention provides electrode silver paste for the front surface of a crystalline silicon solar cell, the raw material components comprise organic resin, silver powder, glass powder, a solvent and an organic additive, and the preparation method comprises the following steps: resin dissolution, silver powder wrapping, resin shaping, secondary dispersion and silver paste preparation. According to the preparation method of the coated silver powder by firstly dissolving the resin, an obtained positive silver paste system of the silver powder and the resin is wider in selection range of the resin, any resin capable of being dissolved in a solvent can be used for coating the silver powder through the method, and the selection range of the coated resin is greatly widened. And some resins which cannot be well dissolved in a solvent can also be used in an organic system of the slurry, so that the application range of the resins is expanded, and greater possibility is provided for better adaptation to fine line printing.

Description

technical field [0001] The invention relates to a front fine grid of a crystalline silicon solar cell and a printing electrode silver paste and a preparation method thereof, and belongs to the field of solar photovoltaic silver paste and solar crystalline silicon cells. Background technique [0002] At present, the resin and solvent are dissolved at a certain temperature and then mixed with other raw materials such as silver powder, glass powder and other raw materials. It is common that the coating of the silver powder by the resin is not complete, or the surface of some silver powder is not covered by resin due to uneven mixing. Partial silver particles are separated from the system during long-term use, resulting in technical problems such as a decrease in EL yield. [0003] In view of the above technical defects, the present invention provides a silver paste for electrodes (fine grid and printing) on ​​the front side of crystalline silicon solar cells and a preparation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 张海旺赵北平李彪
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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