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Preparation method for back silver paste of solar cell

A technology for solar cells and back silver paste, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problem of reducing contact resistivity, reducing silver content, high silver content, etc. problem, achieve the effect of improving photoelectric conversion rate, reducing contact resistivity, and simple preparation steps

Inactive Publication Date: 2016-07-06
JIANGSU SHIKONG COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problem that the paste silver layer using the mixture of granular silver powder and flake silver powder as the conductor has low solder resistance and conductivity, and high silver content, which increases the production cost, it provides One is mainly to mix silica and sodium silicate and other substances with deionized water, and add silver nitrate and other substances, mix and heat to prepare spherical silver mixed powder, and then add ammonia water to the silver nitrate solution to form a silver ammonia complex Combined ion solution, then add binder to it, stir and heat, separate, mix the collected centrifuge with spherical silver mixed powder, and mix with urea aqueous solution, pass formaldehyde gas into it when it is heated, make it react, and finally carry out Grinding and rolling can be used to prepare the solar cell back silver paste. The solar cell back silver paste prepared by the present invention reduces the contact resistivity, improves the photoelectric conversion rate, and reduces the silver content to only 27-35 %

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First, weigh 150g of silicon dioxide powder, 55g of sodium silicate and 30g of dolomite powder, stir and mix to obtain a mixture. According to the solid-to-liquid ratio of 1:3, mix the mixture with deionized water evenly, and place it in a 250W ultrasonic disperser Ultrasonic dispersion treatment for 2 hours in a medium to obtain a suspension; then mix the silver nitrate powder and the suspension prepared above according to the solid-to-liquid ratio of 1:2, put them in a beaker, and heat the beaker to 90 ° C, and then heat At the same time, add silver nitrate powder mass 7% sodium methoxide, stir while heating, react for 2 hours, after the reaction is finished, filter, put the filtrate in an oven at 80°C to dry for 3 hours, put it in a pulverizer, pulverize and pass through a 200-mesh sieve , to obtain spherical silver mixed powder, set aside; then measure 250mL mass fraction of 25% silver nitrate solution and place it in a 1L beaker, then slowly add 120mL of mass fracti...

example 2

[0022] First, weigh 100g of silica powder, 40g of sodium silicate and 20g of dolomite powder, stir and mix to obtain a mixture. According to the solid-to-liquid ratio of 1:3, mix the mixture with deionized water evenly, and place it in a 200W ultrasonic disperser Ultrasonic dispersion treatment for 1 hour in the medium to obtain a suspension; then mix the silver nitrate powder and the suspension prepared above according to the solid-to-liquid ratio of 1:2, put them in a beaker, and heat the beaker to 85 ° C, and then heat At the same time, add silver nitrate powder mass 5% sodium methoxide, stir while heating, react for 1h, after the reaction is finished, filter, put the filtrate in a 70°C oven to dry for 2h, put it in a pulverizer, pulverize and pass through a 200-mesh sieve , to obtain spherical silver mixed powder, set aside; then measure 200mL mass fraction of 25% silver nitrate solution and place it in a 1L beaker, then slowly add 100mL of mass fraction of 17% ammonia wate...

example 3

[0025]First, weigh 120g of silicon dioxide powder, 50g of sodium silicate and 25g of dolomite powder, stir and mix to obtain a mixture. According to the solid-to-liquid ratio of 1:3, mix the mixture with deionized water evenly, and place it in a 220W ultrasonic disperser Ultrasonic dispersion treatment for 1 h in the medium to obtain a suspension; then mix the silver nitrate powder and the suspension prepared above according to the solid-to-liquid ratio of 1:2, put them in a beaker, and heat the beaker to 87 ° C, and then heat At the same time, add silver nitrate powder mass 6% sodium methoxide, stir while heating, react for 1h, after the reaction is finished, filter, put the filtrate in a 75°C oven for 2h, put it in a pulverizer, pulverize and pass through a 200-mesh sieve , to obtain spherical silver mixed powder, set aside; then measure 220mL mass fraction of 25% silver nitrate solution and place it in a 1L beaker, then slowly add 110mL of mass fraction of 17% ammonia water ...

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Abstract

The invention relates to a preparation method for back silver paste of a solar cell, and belongs to the technical field of preparation of the solar cell. The preparation method comprises the following steps of firstly, mixing substances such as silicon dioxide and sodium silicate, mixing the substances with deionized water, adding substances such as silver nitrate, mixing and heating the mixture, preparing spherical silver mixed powder, and dropwise adding ammonia water into a silver nitrate solution to form a silver-ammino complex ion solution; secondly, adding a binding agent into the silver-ammino complex ion solution, stirring, heating and separating the product, mixing the collected centrifugal substance with the spherical silver mixed powder, mixing the obtained product with an urea aqueous solution, and introducing a formaldehyde gas during heating the obtained product to allow reaction; and finally, grinding and rolling the obtained product, thereby obtaining the back silver paste of the solar cell. With the back silver paste of the solar cell, prepared according to the method, the contact resistivity is reduced, the photoelectric conversion rate is improved, and moreover, the silver content is reduced and only reaches 27-35%.

Description

technical field [0001] The invention relates to a method for preparing solar cell back silver paste, and belongs to the technical field of solar cell preparation. Background technique [0002] Solar energy is a kind of green energy. People pay more and more attention to it because of its advantages of non-pollution, inexhaustibility, and not limited by geographical resources, so solar cells emerge as the times require. A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, the solar cell will generate current, collect and transmit electricity through grid lines and electrodes. Among them, the solar cell back silver paste is the main component of the solar cell electronic paste, which is mainly used to make the back busbar in the production of solar cells, and plays the role of converging and exporting the current collected by the aluminum back field. [0003] The silver paste uses a mixture of granular silv...

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 陈明生薛培龙
Owner JIANGSU SHIKONG COATING
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