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Silver-aluminum paste easy to sinter for solar cell

A technology of conductive silver paste and silver powder, which is applied in the field of conductive material precursors, silver-aluminum paste for solar cells, and consumable materials in the electronic field. Warping and other problems, to avoid warping and falling off, reduce the difference in shrinkage coefficient, and improve the effect of easy sintering

Inactive Publication Date: 2016-07-27
江阴市天邦涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with aluminum paste, silver paste has the disadvantage of high sintering temperature
Because the crystalline silicon used in solar cells is extremely sensitive to temperature, an increase in the sintering temperature will lead to a substantial increase in the degree of deterioration of the properties of crystalline silicon during the sintering process, resulting in a decrease in the yield of solar cells and an increase in low-efficiency chips
Moreover, too high a sintering temperature will cause the stress between the electrode and the substrate to increase, which will eventually cause warping of the solar cell or electrode, reducing the quality and photoelectric conversion efficiency of the solar cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0038] Preparation of glass powder

[0039] The glass powder is taken in the following proportions and comprises the following components: SiO 2 3-17%, TiO 2 1-2%, Bi 2 o 3 35-55%, Al 2 o 3 4-8%, SrCl 2 1-7%, B 2 o 3 15-38%, SnO 2 2 to 5%, CaO 0.1 to 2%, 100% powder in total, mixed evenly, sintered at 950-1160°C, quenched, ball milled, dried, and passed through a 400-mesh sieve to obtain glass powder.

[0040] Table 1 glass powder raw material composition ratio

[0041]

Embodiment 6-10

[0043] Preparation of conductive silver paste

[0044] Get silver powder, glass powder, methyl cellulose, ethyl cellulose, butyl carbitol, isophthalic acid alkyd resin, petroleum resin, terpineol and polyamide wax according to the ratio in Table 2, and remove isophthalic acid Mix ingredients other than alkyd resin and petroleum resin, heat to 90°C, stir evenly to obtain a premixed solution, add silver powder, graphite powder, ceramic micropowder and glass powder, stir vigorously for 0.5-3 hours, add isophthalic acid alkyd Resin and petroleum resin, continue to stir for 0.5-1 hour, finally add polyamide wax, mix evenly, and obtain conductive silver paste. Among them, the glass frit prepared in Example 2 was used in Examples 6-10, and the specific raw material ratios for preparing the silver paste are shown in the table below.

[0045] Table 2 Conductive silver paste composition ratio

[0046]

[0047] In Example 6, no graphite powder or ceramic micropowder was used,...

Embodiment 11-13

[0049] Each component was weighed according to the corresponding ratio in Table 3, wherein the glass powder prepared in Example 4 was used as the glass powder. Mix the ingredients except isophthalic alkyd resin and petroleum resin, heat to 100°C, melt completely, stir and mix evenly to obtain a premixed solution. Add silver powder, graphite powder, ceramic powder and glass powder, stir vigorously for 1 hour, add isophthalic acid alkyd resin and petroleum resin, continue stirring for 0.5 hour, finally add polyamide wax, mix evenly, and obtain conductive silver paste.

[0050] Table 3 Conductive Silver Paste Component Ratio

[0051]

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PUM

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Abstract

The invention discloses a conductive silver paste, which comprises the following components in weight percentage: 60-70% of silver powder, 1-2% of graphite powder, 2-5% of ceramic micropowder, 11-17% of glass powder, and 9% of organic binder ‑18%, auxiliary agent 1‑2%, total 100%; the silver powder is 61‑90nm silver powder; the graphite powder is 200‑400 mesh graphite powder; the glass powder contains the following components: SiO 2 3‑17%, TiO 2 1‑2%, Bi 2 o 3 35‑55%, Al 2 o 3 4-8%, SrCl 2 1‑7%, B 2 o 3 15‑38%, SnO 2 2-5%, CaO 0.1-2%, 100% in total.

Description

technical field [0001] The invention relates to a conductive paste, in particular to a silver-aluminum paste for solar cells, which belongs to consumable materials in the field of electronics and is a conductive material precursor. Background technique [0002] Solar cells are semiconductor devices that convert solar energy into electrical energy. Solar cells are a new type of green energy, which can effectively use solar energy to replace traditional energy sources, reduce carbon dioxide emissions, protect the natural environment, and achieve sustainable development. [0003] During the manufacture of solar cells, electrodes must be introduced on the front and back of the panel. The method of introducing electrodes in the prior art is generally to use silver paste to screen-print to form electrode blanks with specific patterns, and then sinter them at high temperature. [0004] Silver paste is mostly used in the prior art, because silver paste has the advantages of low el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425
Inventor 吴立新
Owner 江阴市天邦涂料股份有限公司
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