Aluminum conductive paste for silicon solar cell back surface field and preparation method thereof

A technology of silicon solar cells and conductive paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of accelerating the decline of silicon solar cells, bending of silicon wafers, and affecting the conductivity of aluminum paste sexual issues

Inactive Publication Date: 2010-01-06
付天恩
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AI Technical Summary

Problems solved by technology

[0003] At present, glass powder is added or has glass powder components after sintering in the existing technologies, such as patents with application numbers 200580018265. Powder and silicon wafer, and glass powder will affect the conductivity of aluminum paste, and glass powder contains a variety of metal ions, some metal ions diffuse in silicon much higher than aluminum, destroying the PN junction of silicon wafers, and accelerating the development of silicon solar cells At the same time, the glass powder is brittle, and it is easier to bend and strain the silicon wafer

Method used

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Embodiment 1

[0026] Dissolve 20 grams of ethyl cellulose in 80 grams of terpineol, and heat to 100°C during the dissolving process to fully dissolve to form a transparent glue for later use. Mix 20 grams of magnesium powder with 80 grams of aluminum powder, add 6 grams of zinc stearate, put them into a grinding tank after mixing, the mass ratio of ball milling medium to powder is 10:1, and form magnesium aluminum alloy powder after grinding for 10 hours. Take 20 grams of the above transparent glue, add 16 grams of diethylene glycol methyl ether, 6 grams of dibutyl phthalate, 2 grams of ethylene glycol methyl ether, and 1 gram of lecithin, mix well, then add 8 grams of tin powder, 2 grams of gallium, 2 grams of antimony powder, 20 grams of magnesium-aluminum alloy powder, and 123 grams of aluminum powder were fully stirred and wetted, and then rolled with a three-roll mill for 4 hours to form a paste slurry. The prepared aluminum conductive paste is screen-printed, dried, and rapidly sinter...

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Abstract

The invention relates to aluminum conductive paste for a silicon solar cell back surface field and a preparation method thereof. The paste is prepared by dissolving ethyl cellulose into terpineol, adding organic solvent and additive into the mixture, then stirring the solution, adding aluminum powder, stannum powder, gallium powder, stibium powder and magnalium alloy powder, stirring the solution and rolling by a three-roller muller. A silicon solar cell prepared by the paste has high photoelectric conversion efficiency, good conductivity of an aluminum film, smooth surface, no aluminum pills, no foaming and firm attachment of an aluminum sheet. In the invention, the stannum powder is used as inorganic binder and has extremely little pollution to silicon sheet heavy metal ions accordingly, and a manufactured solar cell has slower declination during using. The invention solves the problems of poor conductivity, bend silicon sheet, heavy metal pollution and the like existing in an aluminum film made of aluminum paste in the prior silicon solar cell. The aluminum conductive paste is especially suitable for fast sintering process in the prior silicon solar cell production line.

Description

technical field [0001] The invention relates to a conductive paste and a preparation method thereof, more specifically, the present invention relates to an aluminum conductive paste for the back field of a silicon solar cell and a preparation method thereof. Background technique [0002] Silicon solar cell is a kind of clean and environment-friendly renewable energy. With the consumption of non-renewable energy, the utilization of renewable energy has been paid more and more attention by various countries. It is a hotspot of international research. What everyone pursues is to improve the photoelectric conversion efficiency. The aluminum conductive paste is used to make the back field of silicon solar cells, which affects the photoelectric conversion efficiency of silicon solar cells. The sintered aluminum film must be firmly attached, the silicon wafer should not be bent, dust free, aluminum beads should not be free, and the surface should be smooth. It is also necessary to...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18H01B1/22H01B13/00
CPCY02P70/50
Inventor 付天恩
Owner 付天恩
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