Hyperpure silver powder for solar cell conductive silver paste and preparing method of hyperpure silver powder

A technology for solar cells and conductive silver paste, which is applied in the field of ultra-pure silver powder for conductive silver paste of solar cells and its preparation, ultra-pure silver powder and its preparation, and can solve the problem of affecting the conductive effect of electrodes, not obtaining pure silver powder, and reducing the cost of solar cells. Photoelectric conversion efficiency and other issues, to achieve the effect of simple plasma post-treatment process, conducive to large-scale production, and improve photoelectric conversion efficiency

Active Publication Date: 2014-01-29
QINGDAO CUP NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this also lays a hidden danger for the purification of silver powder. If the amount of dispersant is too small, it will not be enough to completely cover the silver powder, and it will not be able to disperse. If it is too much, it will bring difficulties to washing.
In order to obtain the higher silver powder of purity, most methods are to carry out a large number of times of water washing and alcohol washing to the silver powder, which not only causes waste, but also cannot obtain the higher silver powder of purity; In the method for preparing spherical ultrafine silver powder, in order to obtain silver powder with higher purity, the method of heat preservation and heat treatment at 350 ° C is used to remove impurities. Although relatively pure silver powder is obtained, the silver powder is very easy to agglomerate during high-tempera

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ① Weigh 102g of silver nitrate and dissolve in 300ml of pure water, adjust the pH to 10 with ammonia water, weigh 4.08g of polyvinyl alcohol and dissolve in 500ml of pure water, mix well, and set the volume to 1000ml of mixed reaction solution A;

[0028] ② Weigh 250g of ascorbic acid and dissolve it in 300ml of pure water, adjust the pH to 10 with ammonia water, and set the volume to 1000ml of ascorbic acid-ammonia water mixed reduction solution B;

[0029] ③Use a constant temperature water bath to heat the mixed reaction solution A and the mixed reduction solution B to the set temperature of 50°C;

[0030] ④ Stir and mix the reduction solution B under magnetic stirring in a constant temperature water bath, the stirring speed is 1000r / min, after the speed is stable, add the mixed reaction solution A at a dropping rate of 5ml / s;

[0031] ⑤ After the dropwise addition, continue to stir for 10 minutes, filter the obtained silver powder with suction, wash twice with water ...

Embodiment 2

[0033] ① Weigh 51g of silver nitrate and dissolve in 300ml of pure water, adjust the pH to 7 with ammonia water, weigh 4.08g of polyvinyl alcohol and dissolve in 500ml of pure water, mix well, and dilute to 1000ml of mixed solution A;

[0034] ② Weigh 211g of ascorbic acid and dissolve it in 300ml of pure water, adjust the pH to 7 with ammonia water, and set the volume to 1000ml of ascorbic acid-ammonia water mixed solution B;

[0035] ③Use a constant temperature water bath to heat the mixed solution A and B to the set temperature of 50°C;

[0036] ④ Stir the mixed solution B under magnetic stirring in a constant temperature water bath. The stirring speed is 2000r / min. After the rotational speed is stable, add the mixed solution A at a dropping rate of 5ml / s;

[0037] ⑤ After the dropwise addition, continue to stir for 30min, the gained silver powder is suction filtered, washed twice with water, washed twice with ethanol, dried at 60°C for 3 hours, passed through a 250 mesh si...

Embodiment 3

[0039] ① Weigh 51g of silver nitrate and dissolve in 300ml of pure water, adjust the pH to 5 with ammonia water, weigh 8.16g of gelatin and dissolve in 500ml of pure water, mix well, and dilute to 1000ml of mixed solution A;

[0040] ②Weigh 300g of ascorbic acid and dissolve it in 300ml of pure water, adjust the pH to 5 with ammonia water, and set the volume to 1000ml of ascorbic acid-ammonia water mixed solution B;

[0041] ③Use a constant temperature water bath to heat the mixed solutions A and B to the set temperature of 30°C;

[0042]④ Stir the mixed solution B under magnetic stirring in a constant temperature water bath. The stirring speed is 1500r / min. After the speed is stable, add the mixed solution A at a dropping rate of 1ml / s;

[0043] ⑤After the dropwise addition, continue to stir for 30min, the gained silver powder is suction filtered, washed twice with water, washed twice with ethanol, dried at 60°C for 3 hours, passed through a 250 mesh sieve, treated with argon...

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Abstract

The invention relates to a hyperpure silver powder for solar cell conductive silver paste and a preparing method of the hyperpure silver powder. The preparing method comprises the steps that a mixed reaction solution A of silver nitrate and a dispersing agent and an ascorbic acid mixed reducing solution B are prepared; the solution A and the solution B are preheated at a constant temperature in a water bath kettle, the solution A and the solution B are stirred in a magnetic mode and then mixed for conducting reduction reaction; aftertreatment and a plasma process are conducted on obtained silver powder to obtain the hyperpure silver powder which meets the demand of the solar cell conductive silver paste. A plasma technology is applied so that the prepared silver powder is high in purity, the purity is larger than or equal to 99.99%, the ohmic contact of the silver powder and a silicon substrate can be facilitated when the silver paste is sintered, and a dense membrane is formed. Under the premises that the purity is improved and the characteristics of the silver powder are not changed, the prepared silver powder is made to have the average grain diameter of 0.1-5 micrometers, grain diameter distribution is narrow, dispersity is good, tap density is larger than or equal to 4.5g/cm<3>, and the photoelectric converting efficiency of solar cells can be better improved. A plasma aftertreatment process is simple, and mass production is facilitated.

Description

technical field [0001] The invention relates to an ultrapure silver powder and a preparation method thereof, in particular to an ultrapure silver powder for solar cell conductive silver paste and a preparation method thereof, belonging to the technical field of electronic materials. Background technique [0002] With the depletion of global resources and the deterioration of the environment, the future solar photovoltaic technology and industry have strong competitiveness. Driven by the huge potential of the international photovoltaic market, the solar cell manufacturing industries of various countries are scrambling to invest huge sums of money and expand production in order to compete for a place. my country has become the largest producer and exporter of silicon solar cells. [0003] Silver powder has become an important material in the electrical and electronic industries due to its excellent electrical conductivity and application properties. It is the most widely used ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
Inventor 郭大为孙洪亮陈晓光谭小英
Owner QINGDAO CUP NEW MATERIALS CO LTD
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