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.

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.

CN106825544AInactive Publication Date: 2017-06-13ENVIRONMENTAL NATURAL CHEM JIANGSU
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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

Examples

Experimental program
Comparison scheme
Effect test

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

Patent Timeline
13 Jun 2017
Publication
CN106825544A
IPC
B22F1/00; B22F9/24
CPC
B22F9/24; B22F1/065
Inventors
何靳安; 白海赞