Solar panel etching process for preventing EL pollution

Abstract

The invention relates to the technical field of battery piece etching, and particularly relates to a solar panel etching process for preventing the EL pollution. The process comprises the steps that in step 1, plating film is prepared, a layer of aluminum film is plated on both the upper and lower surfaces of the to-be-etched silicon wafer; in step 2, primary removal of impurities is conducted; in step 3, secondary removal of impurities is conducted, then the film is soaked in a primary etching liquid; in step 4, the remaining aluminum film is removed; in step 5, etching is prepared; and in step 6, etching is conducted. Through the effect of aluminum film, and oxygen and variable temperature heating at the primary removal of impurities, the removal of impurities on silicon wafer is achieved, then through the reaction role of the primary etching liquid and aluminum film at the secondary removal of impurities, the aluminum film is made to further adsorb the impurities inside the silicon wafer, to better achieve the function of removing impurities for silicon wafer, in the wafer etching process, through the function of the primary removal of impurities and the secondary removal of impurities, EL pollution is effectively prevented while etching, the producing of electric leakage battery boards and hidden crack battery boards is reduced and very effective.

Description

technical field [0001] The invention relates to the technical field of cell sheet etching, in particular to a solar cell panel etching process for preventing EL pollution. Background technique [0002] The cell diffusion process adopts the back-to-back single-sided diffusion technology of two cells. After diffusion, phosphorus atoms will be diffused on the upper surface and edge of the silicon wafer to form a PN junction, which can form a photovoltaic effect under the action of light. However, the electrons generated by it will be conducted to the lower surface of the cell along the edge PN junction, causing a short circuit of the cell. Therefore, another important process in the production of solar cells - etching, its main purpose is to remove the PN junction at the edge of the cell to avoid leakage failure of the cell. [0003] After the solar panel has been processed by the etching process, it is often necessary to perform EL testing. For the EL testing results, a large...

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Problems solved by technology

[0003] After the solar panel has been processed by the etching process, it is often necessary to perform EL testing. For the EL testing results, a large number of leaky panels and cracked panels often appear, causing very large economic losses.

[0004] In the prior art, the main reason for this kind of EL detection pollution is that the impurity content in the battery panel is too much or the distribution is uneven, resulting in a decrease in the minority carrier content in the battery panel, which in turn affects the efficiency of the battery panel, so it is necessary to remove impurities from the battery panel , but it is very troublesome to remove impurities on the battery board, and after the removal of impurities is completed, it is easy to be polluted again, so we combine the removal of impurities with the etching process to propose an etching process that can prevent EL pollution