Pore ​​filling slurry and its preparation method and use

Abstract

The invention relates to a pore-filling slurry and its preparation method and application. The pore-filling slurry consists of 75-85% of special glass powder and 10-25% of an organic carrier. The composition (percentage by weight) of described glass powder: Bi 2 o 3 75%~85%, SiO 2 2~10%, Al 2 o 3 1~5%, B 2 o 3 5~20%, other additives 2~8%. Using the hole-filling paste of the present invention, after printing the front grid electrode, use special equipment to point the hole-filling paste into the pinholes of the battery sheet, which can be used for hole-filling of solar silicon pinhole sheets, and the batteries with pinholes Tablets are used effectively.

Description

technical field [0001] The invention relates to the technical field of preparation of crystalline silicon solar cells, in particular to a hole filling slurry for solar silicon pinhole sheets and a preparation method thereof. Background technique [0002] In the process of silicon wafer production, due to the small impurities mixed in the crystal pulling material, these impurities enter the crystal during the crystal pulling process, which will lead to the generation of pinhole chips. Under the same cell production process, the presence of pinhole sheets not only has a huge impact on the electrical properties of the cell itself, but also has an adverse effect on normal cells during the production process. For example, when printing the aluminum back field, the aluminum paste will contaminate the printing table through the pinhole position, causing pollution to the subsequent normal film. [0003] In view of the extremely low sales price of pinhole cells in normal production ...

AI Technical Summary

Problems solved by technology

Under the same cell production process, the existence of pinhole sheets not only has a huge impact on the electrical properties of the cell itself, but also has an adverse effect on normal cells during the production process.

For example, when printing the aluminum back field, the aluminum paste will contaminate the printing table through the pinhole position, causing pollution to the subsequent normal film

[0003] In view of the extremely low sales price of pinhole cells in normal production and the adverse effects on normal cells, silicon chips with pinholes are generally isolated from the production line and are basically useless

However, the purchase price of silicon wafers with pinholes is about 3 / 4 lower than that of silicon wafers without pinholes. can be effectively utilized, then the cost of battery production will be greatly reduced

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