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Silver powder production method capable of controlling sintering activity

A production method and sintering activity technology, which is applied in the field of solar cells, can solve the problems of unfavorable slurry rapid sintering process and high powder sintering temperature, and achieve the effect of easy operation, simple process and convenient operation

Inactive Publication Date: 2020-03-24
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly used to prepare nano-scale silver powder. The prepared silver powder has high purity, good crystallinity and uniform particle size, but the sintering temperature of the existing powder is high, which is not conducive to the rapid sintering process of the slurry.

Method used

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  • Silver powder production method capable of controlling sintering activity
  • Silver powder production method capable of controlling sintering activity
  • Silver powder production method capable of controlling sintering activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Prepare 15% dilute sulfuric acid solution.

[0031] 2. Activation of silver powder: Take 60g of 0.5μm silver powder in a 500ml beaker, add 300ml of 5% dilute sulfuric acid solution, stir ultrasonically for 25 minutes, let it stand, pour off the supernatant, wash it once with 300ml of deionized water, and then Wash once with 300ml dilute sulfuric acid solution, and finally wash with deionized water until neutral.

[0032] 3. Preparation of reducing solution: Weigh 0.57g of ascorbic acid and 2g of potassium borohydride into a 500ml beaker, add 300ml of deionized water to dissolve, and boil for 5-10min.

[0033] 4. Prepare silver ammonia solution: Weigh 21g of silver nitrate into a 500ml beaker, add 400ml of deionized water to dissolve, add ammonia water dropwise until the solution is transparent. Weigh 8g of sodium hydroxide and dissolve it in 200ml of deionized water, slowly add the sodium hydroxide solution into the silver ammonia solution, if precipitation occurs, ...

Embodiment 2

[0037] 1. Prepare 5% dilute sulfuric acid solution.

[0038] 2. Activation of silver powder: Take 60g of 5.0μm silver powder in a 500ml beaker, add 300ml of a mixed solution of 5% dilute sulfuric acid and OP-10, stir ultrasonically for 25 minutes, let it stand, pour off the supernatant, and then use 300ml of deionized water Wash to neutral.

[0039] 3. Preparation of reducing solution: Weigh 7g of potassium borohydride into a 500ml beaker, add 300ml of deionized water to dissolve, and boil for 5-10min.

[0040] 4. Preparation of silver ammonia solution: Weigh 4.71g of silver nitrate into a 250ml beaker, add 90ml of deionized water to dissolve, add ammonia water dropwise until the solution is transparent. Weigh 2g of sodium hydroxide and dissolve it in 70ml of deionized water, slowly add the sodium hydroxide solution into the silver ammonia solution, if precipitation occurs, add ammonia water to dissolve.

[0041] 5. Preparation of silver-coated powder: add the activated silv...

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Abstract

The invention relates to a silver powder production method capable of controlling sintering activity. In particular, on the basis of the silver powder obtained by physical condensation, a layer of silver grains with controllable grain size is deposited on the surface by adopting a chemical plating mode. According to the method, the grain size of silver particles generated on the surface can be controlled according to the concentration and the reaction time of silver nitrate, the silver powder treated through the process is good in dispersity, uniform in particle and high in sintering activity,the method can be used for industrial production, and the silver powder prepared through the method can be better applied to the field of solar cells.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for producing silver powder with controllable sintering activity. Background technique [0002] Solar front silver paste is the key material for making the front grid electrode of silicon solar cells, which directly affects the conversion efficiency (η), series resistance (Rs), open circuit voltage (V∝) and other properties of solar cells. Front silver paste is mainly composed of superfine metal silver powder, glass frit, organic vehicle and inorganic additives. Front-side silver paste is screen-printed and sintered to form a grid electrode on the front of the cell. The quality of the Ag-Si ohmic contact of the grid electrode directly affects the conversion efficiency of the cell. There are two key points and difficulties in the front silver electrode. First, the front silver paste needs to have a high solid content (usually requiring a mass fraction greater than 90...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F1/00B22F9/12C23C18/44
CPCB22F9/12C23C18/44C23C18/1637B22F1/05B22F1/17
Inventor 王翠霞宋书清王锴尧
Owner JIANGSU BOQIAN NEW MATERIALS
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