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Silver powder used for crystalline silicon solar PERC cell silver paste and preparation method thereof

A solar energy and crystalline silicon technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of destroying passivation films, reducing the effect of passivation and improving efficiency of PERC cells, etc., to meet process requirements, morphology and particle size The effect of high diameter uniformity and simple preparation method

Active Publication Date: 2020-08-18
河南金渠银通金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the conventional back silver paste on the market is applied to PERC cells, some of them can indeed obtain high tensile force, but basically destroy the passivation film, which makes the effect of passivation and efficiency improvement of PERC cells discounted.

Method used

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  • Silver powder used for crystalline silicon solar PERC cell silver paste and preparation method thereof
  • Silver powder used for crystalline silicon solar PERC cell silver paste and preparation method thereof
  • Silver powder used for crystalline silicon solar PERC cell silver paste and preparation method thereof

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preparation example Construction

[0020] The method for preparing the silver powder used for the silver paste of crystalline silicon solar PERC battery provided by the invention comprises:

[0021] Step 1, prepare solution A: add gum arabic powder or gelatin to the reaction kettle, then add deionized water, stir and dissolve evenly, and then set aside; step 2, prepare solution B: add deionized water to the reaction kettle, and then add iso Ascorbic acid and sodium erythorbate, stir to dissolve evenly and set aside; step 3, prepare C solution: add deionized water to the reaction kettle, then add gum arabic powder or gelatin, fully stir to dissolve, then add silver nitrate, stir to dissolve evenly and set aside Step 4, reduction reaction: first add solution B to solution A, then add solution C to solution A, stir after completion, and prepare silver powder; step 5, heat up, add sodium hydroxide or ammonia solution, and heat up again Keep, and then discharge and wash the powder; step 6, wash and filter with a fil...

Embodiment 1

[0033] A method for preparing silver powder for crystalline silicon solar PERC cell silver paste, comprising:

[0034] Step 1, prepare solution A: add 6g of gum arabic powder or gelatin to the reaction kettle, then add 550g of deionized water, stir to dissolve evenly and set aside; keep the temperature range at 46°C during this process.

[0035] Step 2, prepare solution B: add 240g of deionized water to the reaction kettle, then add 40g of erythorbic acid and 15g of sodium erythorbate in sequence, stir and dissolve evenly, and set aside; keep the temperature range at 47°C during the process.

[0036]Step 3, prepare solution C: add 600g of deionized water to the reaction kettle, then add 2.5g of gum arabic powder or gelatin, fully stir to dissolve, then add 100g of silver nitrate, stir to dissolve evenly and set aside; keep the temperature range in the process 42°C.

[0037] Step 4, reduction reaction: first add solution B to solution A at a flow rate of 26ml / min, then add sol...

Embodiment 2

[0043] A method for preparing silver powder for crystalline silicon solar PERC cell silver paste, comprising:

[0044] Step 1, prepare solution A: add 6g of gum arabic powder or gelatin to the reaction kettle, then add 500g of deionized water, stir to dissolve evenly and set aside; keep the temperature range at 45°C during this process.

[0045] Step 2, prepare solution B: add 220g of deionized water to the reaction kettle, then add 40g of erythorbic acid and 15g of sodium erythorbate in sequence, stir and dissolve evenly and set aside; keep the temperature range at 45°C during the process.

[0046] Step 3, prepare solution C: add 600g of deionized water to the reaction kettle, then add 2.5g of gum arabic powder or gelatin, fully stir to dissolve, then add 100g of silver nitrate, stir to dissolve evenly and set aside; keep the temperature range in the process 40°C.

[0047] Step 4, reduction reaction: first add solution B to solution A at a flow rate of 26ml / min, then add sol...

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Abstract

The invention discloses a silver powder used for crystalline silicon solar PERC cell silver paste and a preparation method thereof. The method comprises the steps that: step 1: a solution A is prepared; step 2: a solution B is prepared; step 3: a solution C is prepared; step 4: the solution B is added into the solution A, the solution C is then added into the solution A, and then an obtained solution is stirred; step 5: temperature rise is realized, a sodium hydroxide or ammonium hydroxide solution is added, temperature rise is realized again, and material discharging and powder washing are conducted; step 6: a filter plate is used for washing and filtering, extra water is removed, the washing process is repeated for a plurality of times, silver powder is deposited, and silver powder bodyis obtained after washing and drying; and step 7: a surfactant is added to the dried silver powder, and air flow classification is conducted after evenly mixing. The invention further provides the silver powder prepared in the method. The silver powder and the preparation method can achieve high efficiency and provide the silver powder for high-tensile-strength back silver paste for preparing a back electrode; and the preparation method is simple, the cost is low and the yield is high.

Description

technical field [0001] The present invention relates to a silver powder used for solar battery silver paste and a preparation method thereof, in particular to a silver powder used for crystalline silicon solar PERC battery silver paste and a preparation method thereof. Background technique [0002] With the increasing shortage of global energy, the development and utilization of more efficient clean energy is more urgent. And because solar cells are non-polluting and have a large market space and other advantages, crystalline silicon solar cells that directly use solar radiation to generate electricity are currently the mainstream. With the development of science and technology and the demand of the market, it has become the goal of major manufacturers to develop more efficient solar cells at a lower cost. Back-purified PERC (passivated emitter and rear cell) batteries, as the current mainstream high-efficiency solar cells, have been favored by major manufacturers in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00H01L31/0224
CPCB22F1/0003B22F9/24H01L31/022425Y02E10/50
Inventor 沈仙林周斌
Owner 河南金渠银通金属材料有限公司
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