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Glass dust for back silver paste of solar battery and preparation method of glass dust

A technology for solar cells and glass powder, which is applied in the field of glass powder for silver paste on the back of solar cells and its preparation field, can solve problems such as waste of silver powder, and achieve the effects of reducing paste cost, large pull-off force and high adhesion.

Active Publication Date: 2014-05-07
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, there are three-stage, five-stage, and seven-stage back electrodes of solar cells on the market. The electrode pull-off force ranges from 3.0-5N, and a patent application reaches 5.5N; the content of glass powder in the paste is usually 3-8wt%. , or even higher, in order to provide sufficient pull-off force for the electrode; the silver powder content in the slurry is ≥ 58wt%, which causes a lot of waste of silver powder, so there is an urgent need for a solar energy that can meet the pull-off force and reduce the silver powder content in the glass powder Glass powder for battery back silver paste and preparation method thereof

Method used

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  • Glass dust for back silver paste of solar battery and preparation method of glass dust
  • Glass dust for back silver paste of solar battery and preparation method of glass dust
  • Glass dust for back silver paste of solar battery and preparation method of glass dust

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preparation example Construction

[0021] The preparation method of glass powder for silver paste on the back side of solar cell of the present invention comprises the following steps:

[0022]1) Raw material preparation, prepare glass powder A and glass powder B according to the ratio, put the uniformly mixed glass powder A and glass powder B into the crucible respectively, heat in a muffle furnace to 1100-1300°C, and keep warm for 30-60 minutes Finally, clamp out the crucible and pour the glass liquid into deionized water, quench the water into glass slag, filter out the glass slag and dry it for later use, the water content of the glass slag (wt%)<1%;

[0023] 2) get the glass powder A, glass powder B and inorganic additive that step 1) makes, mix by following weight percentage: glass powder A40-99, glass powder B0-60, inorganic additive 0-10; Medium=1:2-5 weight ratio weighing, add deionized water to 2 / 3 of the volume of the ball mill tank, use horizontal, vertical, planetary ball mill or high-efficiency je...

example

[0025] On March 10, 201, Zhejiang Guangda Electronic Technology Co., Ltd. made the silver paste on the back of the solar cell according to the formula in Table 1-3 below. The pull-off force test data of the solar back electrode is shown in Table 4.

[0026] Table 1 Glass 1 Composition (mol%)

[0027]

[0028] Table 2 Glass 2 Composition (mol%)

[0029]

[0030]

[0031] Table 3 Mixed glass powder composition

[0032]

[0033] Table 4 uses the pull-off force test data of the back electrode prepared by the slurry containing mixed glass frit

[0034]

[0035] In the slurry example of the present invention, a 156*156mm standard single crystal / polycrystalline silicon wafer is used, and the back electrode adopts a three-stage type; the slurry is printed on the silicon wafer by screen printing, and the printing wet weight is 0.025-0.0258g; sintering adopts Despatch infrared Sintering furnace, the sintering temperature is 750-850°C.

[0036] The pull-off force test u...

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Abstract

The invention relates to glass dust for the back silver paste of a solar battery. The glass dust is prepared by grinding and mixing the following raw materials in percentage by weight: 40-99 percent of glass dust A, 0-60 percent of glass dust B and 0-10 percent of inorganic addition agents. According to the invention, when the mixed glass dust is used for preparing solar energy back electrode paste, small amounts of glass dust is used, and the cost of the paste is reduced; the solar energy back electrode paste has large pulling-out force after being sintered, and the photoelectric conversion efficiency of the battery is high.

Description

technical field [0001] The invention relates to a glass powder for silver paste on the back of a solar cell and a preparation method thereof. Background technique [0002] The electron-hole pair current generated by the solar cell after sunlight irradiation needs to be introduced into the external circuit by the positive and rear electrodes of the cell. The reliability and resistivity of the electrodes are directly related to the stability and photoelectric conversion efficiency of the solar cell. The influencing factors are the adhesion of the electrode to the silicon wafer and the contact resistance between the electrode and the silicon wafer. [0003] The adhesion of the electrode to the silicon wafer is formed by the physical and chemical reaction between the glass powder in the slurry and the silicon wafer after melting at high temperature sintering. During the sintering process, the glass powder melts into glass liquid and then wets the silicon wafer, and redox reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
Inventor 安艳奉向东韦富荣江志坚
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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