Cleaning liquid for solar polycrystalline silicon wafer

Abstract

The invention discloses cleaning liquid for cleaning a solar polycrystalline silicon wafer of which the surface is provided with dark spots or dark stains. The cleaning liquid is prepared by mixing an alcohol auxiliary agent, a complexing agent, a polyether surfactant, a dispersing agent, an anti-settling agent and pure water; and the cleaning liquid comprises the following raw materials in percentage by mass: 3 to 40 percent of the alcohol auxiliary agent, 1 to 10 percent of fatty alcohol polyoxyethylene polyoxypropylene ether, 1 to 5 percent of inorganic auxiliary agent, 1 to 5 percent of the complexing agent, 0.5 to 5 percent of the anti-settling agent, and 1 to 80 percent of the pure water. The cleaning liquid has the characteristic of high cleaning efficiency, is simple in preparation, improves the silicon wafer yield, and is favorable for reducing enterprise cost.

Description

technical field [0001] The invention relates to a solar polysilicon chip cleaning solution, in particular to a polysilicon chip cleaning solution with black spots or spots caused by oxidation. Background technique [0002] With the continuous aggravation of energy crisis and environmental problems, countries around the world have conducted a lot of research on renewable energy. Solar energy has become the focus of everyone's attention due to its environmental protection, high storage capacity, safety and potential economy. Since Bell Laboratories in the United States successfully developed a practical silicon single crystal solar cell with a photoelectric conversion efficiency of 6% in 1954, silicon solar cells have become the solar cells in the photovoltaic market because of their high reliability, long life, and ability to withstand various environmental changes. main species. At present, more than 50% of solar cells in the world are made of polysilicon materials. Obviou...

AI Technical Summary

Problems solved by technology

However, during the cleaning process, due to the pollutants remaining on the surface of the silicon wafer for too long, due to the strong adsorption of oxidized pollutants on the surface of the silicon wafer, there are too many chemicals, metal impurities, acid and alkali residues, etc. on the surface of the solar silicon wafer. It cannot be cleaned by the current cleaning method, so black spots and black spots will be formed on the surface of the silicon wafer, which will cause white spots when the solar silicon wafer is textured, resulting in chromatic aberration, affecting the yield and product quality