Preparation method for flaky rhombic silver powder slurry on back of solar cell

A solar cell and silver powder paste technology, which is applied to conductive materials dispersed in non-conductive inorganic materials, circuits, photovoltaic power generation, etc., can solve the problems of reducing contact resistivity, affecting the uniformity of silver powder, and high photoelectric conversion rate. The effect of contact resistivity, improved photoelectric conversion rate, and simple preparation steps

Inactive Publication Date: 2016-04-20
CHANGZHOU QINGFA IND GAS CO LTD
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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 particle size of the silver powder in the current silver paste is too small, and the silver powder will agglomerate, which affects the uniformity of the distribution of the silver powder, a rhombus-shaped silver paste is provided, which can be automatically arranged. To solve the problem that the small particle size of the silver powder affects the uniformity of the distribution, the flaky diamond-shaped silver powder slurry on the back of the solar cell prepared by the present invention has good dispersion performance, high specific surface performance, reduced contact resistivity, and high photoelectric conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First, according to the mass ratio of 1:20, silver nitrate and deionized water were stirred and mixed to prepare silver nitrate solution, and then according to the mass ratio of anhydrous sodium carbonate and silver nitrate solution of 1:21, anhydrous sodium carbonate was added to the nitric acid prepared above In the silver solution, stop stirring after stirring until no precipitation occurs; after the stirring is completed, place it under 300W for ultrasonic dispersion treatment for 15 minutes to completely disperse the precipitate and adjust the pH to 8.0 with 0.8mol / L sodium hydroxide solution to prepare Obtain a dispersion suspension; then according to the mass ratio of hydrazine hydrate and deionized water at 1:5, stir and mix the hydrazine hydrate and deionized water to prepare a hydrazine hydrate solution, and then press the mass ratio of hydrazine hydrate solution to the dispersion suspension at 1:10 , at a rotational speed of 400r / min, slowly dropwise add the h...

example 2

[0023] First, according to the mass ratio of 1:20, silver nitrate and deionized water were stirred and mixed to prepare silver nitrate solution, and then according to the mass ratio of anhydrous sodium carbonate and silver nitrate solution of 1:21, anhydrous sodium carbonate was added to the nitric acid prepared above In the silver solution, stop stirring until no precipitation occurs; after the stirring is completed, place it at 200W for ultrasonic dispersion treatment for 10 minutes to completely disperse the precipitation and adjust the pH to 7.5 with 0.8mol / L sodium hydroxide solution to prepare Obtain a dispersion suspension; then according to the mass ratio of hydrazine hydrate and deionized water at 1:5, stir and mix the hydrazine hydrate and deionized water to prepare a hydrazine hydrate solution, and then press the mass ratio of hydrazine hydrate solution to the dispersion suspension at 1:10 , at a rotational speed of 350r / min, slowly dropwise add the hydrazine hydrate...

example 3

[0026] First, according to the mass ratio of 1:20, silver nitrate and deionized water were stirred and mixed to prepare silver nitrate solution, and then according to the mass ratio of anhydrous sodium carbonate and silver nitrate solution of 1:21, anhydrous sodium carbonate was added to the nitric acid prepared above In the silver solution, stop stirring after stirring until no precipitation occurs; after the stirring is completed, place it under 250W for ultrasonic dispersion treatment for 12min to completely disperse the precipitate and adjust the pH to 7.7 with 0.8mol / L sodium hydroxide solution to prepare Obtain a dispersion suspension; then according to the mass ratio of hydrazine hydrate and deionized water at 1:5, stir and mix the hydrazine hydrate and deionized water to prepare a hydrazine hydrate solution, and then press the mass ratio of hydrazine hydrate solution to the dispersion suspension at 1:10 , at a speed of 370r / min, slowly add the hydrazine hydrate solution...

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PUM

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Abstract

The invention relates to a preparation method for flaky rhombic silver powder slurry on the back of a solar cell and belongs to the technical field of silver slurry preparation. The method includes the steps that firstly, anhydrous sodium carbonate and a silver nitrate solution are mixed and subjected to ultrasonic dispersion processing, after the pH value is adjusted through a sodium hydroxide solution, a hydrazine hydrate solution is dropwise added to the mixture, the mixture is subjected to suction filtration, washed with deionized water and dried, and rhombic stereoscopic super-fine silver powder is obtained; the rhombic stereoscopic super-fine silver powder is placed in a plane die, oscillates and is ground, ground flaky rhombic silver sheets are collected, and the ground flaky rhombic silver sheets, a prepared carrier solvent and other matter are ground and rolled. The prepared flaky rhombic silver powder slurry can be automatically ranked in order, the dispersion performance of the slurry is improved, and the slurry is evenly distributed. The contact resistivity is reduced, the photoelectric conversion rate is increased and ranges from 17.561% to 17.824%, the silver content is smaller than 45%, and the cost of the slurry is reduced.

Description

technical field [0001] The invention relates to a method for preparing sheet-shaped diamond-shaped silver powder paste on the back of a solar cell, and belongs to the technical field of silver paste preparation. Background technique [0002] The solar cell back silver paste is the main component of the solar cell electronic paste. It 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. The silver paste on the back of the solar cell is mainly composed of silver powder, organic binder, inorganic binder, solvent and additives. [0003] Reducing the cost of silver paste is an important part of reducing the cost of solar cells, and it can also make solar cells have more market advantages; in addition, the particle size of silver powder used in the existing silver paste is basically the same, so if the silver powder If the particle size is too large, there will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 陈蓉蓉薛红娟高力群
Owner CHANGZHOU QINGFA IND GAS CO LTD
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