High specific surface area silver powder improving conductivity of solar battery electrode and preparation method

A solar cell, high specific surface area technology, used in metal processing equipment, transportation and packaging to achieve uniform particle size, improved photoelectric conversion efficiency, and high dispersion.

Inactive Publication Date: 2017-06-13
ENVIRONMENTAL NATURAL CHEM JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the limitations of the existing spherical silver powder and flake silver powder in the front silver paste of solar cells, in order to solve the above technical problems, the present invention provides a silver powder with high specific surface area and a preparation method for improving the conductivity of solar cell electrodes , using the positive electrode paste prepared by the high specific surface area silver powder of the present invention, the conductivity of the positive electrode grid line is optimized and improved, that is, the construction of the internal conductive network of the grid line is more dense and perfect, so more excellent crystalline silicon solar cells can be obtained

Method used

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  • High specific surface area silver powder improving conductivity of solar battery electrode and preparation method
  • High specific surface area silver powder improving conductivity of solar battery electrode and preparation method
  • High specific surface area silver powder improving conductivity of solar battery electrode and preparation method

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Embodiment 1

[0028] Such as figure 1 Shown, the preparation method of the described high specific surface area silver powder that improves solar cell electrode conductivity, specifically carries out through following steps:

[0029] S01. the ascorbic acid solution that is the silver nitrate of 1.45mol / L and the ascorbic acid solution that concentration is 1.2mol / L is prepared respectively with deionized water;

[0030] S02. get the 1.5% gelatin of silver nitrate quality, add in the silver nitrate solution of step S01 gained, and in ultrasonic instrument, combine with 400r / min rotating speed stirring to disperse, stirring time 10min, then add the solution that regulates pH value, Make the adjusted pH value 2 to obtain a silver precursor solution;

[0031] S03. Take 1.5% gelatin of the mass of the ascorbic acid solution, add it to the reducing agent solution obtained in step S01, stir at a speed of 400 r / min to disperse, and stir for 10 minutes to obtain a reducing agent mixed solution;

...

Embodiment 2

[0037] The preparation method of the described high specific surface area silver powder that improves solar cell electrode conductivity, specifically carries out through the following steps:

[0038] S01. the ascorbic acid solution that is the silver nitrate of 0.6mol / L and the ascorbic acid solution that concentration is 0.4mol / L is prepared respectively with deionized water;

[0039] S02. Get 6.25% sodium citrate and 6.25% polyvinyl alcohol of the silver nitrate quality, add in the silver nitrate solution gained in step S01, and in the ultrasonic instrument, combine with 400r / min rotating speed to disperse, stirring time 10min, then add adjusting the pH value of the solution so that the adjusted pH value is 2.5 to obtain a silver precursor solution;

[0040] S03. Take 6.25% sodium citrate and 6.25% polyvinyl alcohol of the quality of the ascorbic acid solution, add them to the reducing agent solution obtained in step S01, stir at a speed of 400 r / min for dispersion, and stir...

Embodiment 3

[0045] Embodiment 3: Others are the same as in Embodiment 1, except that the amount added in "secondary parallel flow" is changed to be 0.5 times of the amount added in step S04.

[0046] Such as Figure 4 As shown, the silver powder is spherical particles covered with rod-shaped protrusions on the surface, the average particle size is 2.5-4.0 μm, the bulk density is 3.0 g / mL, the tap density is 6.65 g / mL, and the specific surface area is 0.60 m 2 / g.

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Abstract

The invention discloses high specific surface area silver powder improving conductivity of a solar battery electrode and a preparation method. The silver powder has an average particle size of 0.6-0.75 micrometers, an apparent density of 2.5-5.0g/mL, a tap density of 4.15-6.95g/mL and specific surface area of 0.45-0.75m<2>/g. The method comprises the steps of preparing a silver nitrate solution and a reducer solution, adding a dispersing agent, performing parallel flow addition of various reaction system solutions into a reaction vessel by twice in a twice addition manner, uniformly mixing the reaction system solutions for the first time, keeping a PH value and temperature of reaction liquid as 2-5 and 25-60 DEG C, continuing stirring for 10-30min after feeding, and adding a mixed reaction solution in a parallel flow addition manner with the addition volume of 0.25-0.75 time of the total addition volume of the first time. The silver powder is a spheroid covered with bulges on the surface, is uniform in particle size and has a good crystal surface and high dispersity; the photoelectric conversion efficiency can be improved when the silver powder is used as front silver electrode slurry of crystalline silicon solar battery; the silver powder particularly has excellent characteristics in aspects of short-circuit current, contact resistance, fill factor and the like.

Description

technical field [0001] The invention belongs to the technical field of crystalline silicon solar cells, and relates to a method for preparing silver powder with a high specific surface area by a chemical reduction method, in particular to a silver powder with a high specific surface area for improving the conductivity of solar cell electrodes and a preparation method. Background technique [0002] Crystalline silicon solar cells are devices that convert light energy into electrical energy through the photoelectric effect. Radiation of a suitable wavelength incident on a P-N junction of a semiconductor acts as an external energy source for the generation of hole-electron pairs in the semiconductor. Due to the potential difference at the P-N junction, holes and electrons move across the P-N junction in opposite directions driven by the internal potential difference. Electrons move to the negative contact and holes move to the positive contact, creating a current that delivers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24
CPCB22F9/24B22F1/065
Inventor 何靳安白海赞杨晶孙超
Owner ENVIRONMENTAL NATURAL CHEM JIANGSU
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