Silver powder of crystalline silicon solar perc battery silver paste and preparation method thereof

A technology of solar energy and crystalline silicon, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as poor dispersion, low controllability of flake nano-silver, easy stacking and agglomeration of flake silver powder, etc. Excellent controllability, improve battery efficiency, and prevent agglomeration

Active Publication Date: 2022-03-15
山东建邦胶体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above-mentioned methods for preparing flaky nano-silver are not highly controllable, and the prepared flaky silver powder is prone to stacking and agglomeration, and the dispersibility is not good.

Method used

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  • Silver powder of crystalline silicon solar perc battery silver paste and preparation method thereof
  • Silver powder of crystalline silicon solar perc battery silver paste and preparation method thereof
  • Silver powder of crystalline silicon solar perc battery silver paste and preparation method thereof

Examples

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preparation example Construction

[0032] The preparation method of the silver powder of the silver paste of the crystalline silicon solar energy PERC battery provided by the invention comprises the following steps:

[0033] S1. Prepare silver salt solution, organic ligand solution and reducing agent solution respectively, and ferrous sulfate is included in the described reducing agent solution; Wherein, at least one of the three groups of solutions of the silver salt solution, organic ligand solution and reducing agent solution The solvent of the group solution is an organic salt ionic liquid;

[0034] S2. adding an acid solution to the silver salt solution to regulate the pH value of the silver salt solution to 5-7;

[0035] S3. Add the medium strong reductant solution of preset molar ratio in described silver salt solution, stirring reaction preset time; Then be (1~2):1 by the mol ratio of ferrous sulfate and silver salt, to step S2 The organic ligand solution and the reducing agent solution are synchronous...

Embodiment 1

[0048] A preparation method of silver powder of crystalline silicon solar PERC cell silver paste, comprising the following steps:

[0049] S1. prepare the silver nitrate solution of 5mg / mL, the glycine solution of 5mg / mL and the ferrous sulfate solution of 10mg / mL respectively; The solvent of ferrous sulfate solution is 1-methyl-3-butyltetrafluoroboric acid bromide salt ionic liquid.

[0050] S2. adding an acid solution to the silver nitrate solution to regulate its pH value to 5.5.

[0051] S3. be 0.1:1 by the mol ratio of ascorbic acid and silver nitrate, add ascorbic acid in the described silver nitrate solution that step S2 obtains, react 30min; Be 1.5:1 then by the mol ratio of ferrous sulfate and silver nitrate, glycine and Ferrous sulfate mol ratio is 0.6:1, in the described silver nitrate solution that step S2 obtains, synchronously drip described glycine solution and ferrous sulfate solution, the rate of addition of ferrous sulfate solution is 3 times of glycine solu...

Embodiment 2

[0053] A method for preparing silver powder of crystalline silicon solar PERC battery silver paste, compared with Example 1, the difference is that in step S1, the solvent of glycine solution is also 1-methyl-3-butyl tetrabromide Fluoroborate ionic liquids. Others are substantially the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a silver powder of the silver paste of a crystalline silicon solar PERC battery and a preparation method thereof. The method comprises: respectively preparing silver salt solution, organic ligand solution and reducing agent solution, wherein the reducing agent solution contains ferrous sulfate; at least one group of solutions has an organic salt ionic liquid as a solvent. Add acid solution to the silver salt solution, and control its pH value to be 5~7; Then add the medium-strong reducing agent solution of preset molar ratio, stir and react preset time; Then press the molar ratio of ferrous sulfate and silver salt to be ( 1~2): 1, synchronously drop the organic ligand solution and the reducing agent solution into the silver salt solution, after the dropwise addition, stir and react for a preset time, then separate, wash and dry to obtain a crystalline silicon solar PERC battery Silver powder of silver paste. The invention can effectively adjust the silver salt reduction rate, and the obtained ferrous ion chelate can also be coated on the surface of the silver powder, so as to obtain highly dispersible silver powder and improve battery efficiency.

Description

technical field [0001] The invention relates to the technical field of silver powder preparation, in particular to a silver powder for crystalline silicon solar PERC cell silver paste and a preparation method thereof. Background technique [0002] PERC (Passivated Emitter and Rear Contact) solar cell is a special type of conventional solar cell. Its main feature is that it has a passivation film structure on both the front emitter and the back of the solar cell. The passivation film on the front emitter is used as an anti-reflection layer, and the passivation film on the back is contacted through perforation, which is used to reduce the recombination rate of the back and improve the conversion efficiency of the solar cell. Compared with conventional solar cells, the conversion efficiency of PERC solar cells can be increased by 0.5-1%, which is a solar cell structure with great development potential. [0003] Like conventional solar cell structures, PERC solar cells also hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/107H01L31/0224
CPCB22F9/24H01L31/022425Y02E10/50
Inventor 周勇刘小勇赵庆亮
Owner 山东建邦胶体材料有限公司
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