Silver powder for printing size for solar cell electrodes and preparation process thereof

A technology of solar cells and silver powder, applied in the field of solar cells, can solve the problems of difficult effective transmission of current and low photoelectric conversion efficiency

Active Publication Date: 2013-02-13
昆明高聚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the sintering process of the silver paste prepared by the silver powder in the prior art, the electrodes and the grid lines form breakpoints and broken lines, which makes it difficult to effectively transmit the current generated by the battery sheet. , and finally make the photoelectric conversion ef

Method used

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  • Silver powder for printing size for solar cell electrodes and preparation process thereof
  • Silver powder for printing size for solar cell electrodes and preparation process thereof
  • Silver powder for printing size for solar cell electrodes and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A. Prepare respectively the silver nitrate solution that is 0.5mol / L and the ascorbic acid solution that concentration is 0.5mol / L with deionized water;

[0025] B. Get 1% polyvinylpyrrolidone of the silver nitrate quality, add in the silver nitrate solution obtained in step A, and disperse for 5 minutes with a rotating speed of 450r / min under ultrasonic conditions, then adjust the pH of the mixed solution with dilute nitric acid to be 2, and obtain Silver precursor solution;

[0026] C. Get 1% polyvinylpyrrolidone of reducing agent quality, add in the reducing agent solution obtained in step A, obtain reducing mixed solution;

[0027] D. According to the molar ratio of reducing agent:silver nitrate=1:1, the silver precursor solution obtained in step B is gradually added dropwise to the reduction mixed solution obtained in step C for reaction, then left to stand, and then the liquid and solid are separated, and then the The solid was washed three times with deioniz...

Embodiment 2

[0029] A. Prepare respectively the silver nitrate solution that concentration is 1.5mol / L and the glucose solution that concentration is 0.6mol / L with deionized water;

[0030] B. Get 2.5% Tween of the silver nitrate mass, add it in the silver nitrate solution obtained in step A, and disperse for 5 minutes with a rotating speed of 500r / min under ultrasonic conditions, then adjust the pH of the mixed solution with dilute nitric acid to be 4 to obtain silver nitrate Precursor solution;

[0031] C. Take 2.5% Tween of reducing agent quality, add in the reducing agent solution obtained in step A, obtain reducing mixed solution;

[0032] D. According to the molar ratio of reducing agent:silver nitrate=2:1, the silver precursor solution obtained in step B is gradually added dropwise to the reduction mixed solution obtained in step C for reaction, then left to stand, and then the liquid and solid are separated, and then The solid matter was washed 3 times with deionized water and...

Embodiment 3

[0034] A. Prepare the silver nitrate solution that is 2mol / L and the triethanolamine solution that concentration is 0.7mol / L with deionized water respectively;

[0035] B. Get the polyethylene glycol of 5% of silver nitrate quality, add in the silver nitrate solution gained in step A, and under the condition of ultrasonic wave with rotating speed be that 600r / min carry out disperse for 5 minutes, then adjust the pH of mixed solution with dilute nitric acid to be 6, Obtain silver precursor solution;

[0036] C. Get 5% polyethylene glycol of reducing agent quality, add in the reducing agent solution obtained in step A, obtain reducing mixed solution;

[0037] D. According to the molar ratio of reducing agent: silver nitrate = 4: 1, the silver precursor solution obtained in step B is gradually added dropwise to the reduction mixed solution obtained in step C for reaction, then left to stand, and then the liquid and solid are separated, and then the The solid matter was washe...

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Abstract

The invention provides silver powder for printing size for solar cell electrodes and a preparation process thereof. The silver powder is composed of spherical, dendritic and random shaped silver powder bodies, the tap density is 3.96-5.21g/mL, the mean particle size is 0.6-3.5 microns, and the apparent density is 2.35-2.72g/mL. The preparation process includes preparing a silver nitrate solution and a reducing agent solution; respectively adding in a dispersing agent for dispersion; adding a silver precursor solution dropwise into a reducing mixed solution for reaction and standing; separating out liquid and solids; washing the solids with deionized water and ethanol respectively; and soaking in a protective agent and drying to obtain the silver powder for the printing size for the solar cell electrodes. The silver powder prepared through the process has a good crystallization surface and high dispersibility, a single particle size is large, the silver powder in various particle forms is mixed and can achieve high photoelectric converting efficiency when used on conductive fillers of conductive paste required by forming of front silver electrodes of crystalline silicon solar cells, and better filling and electric properties are provided compared with commonly used silver powder.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a method for preparing silver powders in various forms by a chemical reduction method, in particular to a novel silver powder for printing paste for solar cell electrodes and a preparation method thereof. Background technique [0002] Solar energy is a kind of green energy. People pay more and more attention to it because of its advantages of no pollution, inexhaustibility, and no limitation of geographical resources. Therefore, solar cells have emerged 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. The front electrodes and grid lines of solar cells are made of conductive silver paste through high-speed and high-precision screen printing, low-temperature drying, and high-temper...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24
Inventor 黄惠
Owner 昆明高聚科技有限公司
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