Cleaning agent used after texturing of solar silicon wafer and cleaning process thereof

Abstract

The invention discloses a cleaning agent used after texturing of a solar silicon wafer and a cleaning process thereof, the cleaning agent comprises a surfactant, a chelating agent, a solvent, a wetting agent, an organic salt and deionized water according to a certain weight percentage, and the surfactant, the chelating agent, the solvent, the wetting agent, the organic salt and the deionized water are mixed to prepare the cleaning agent used after texturing of the solar silicon wafer. Alkali is added into deionized water to prepare an alkali solution with the concentration of 0.002-0.06 wt%, hydrogen peroxide with the concentration of 0.005-0.5 wt% is added into the alkali solution, the cleaning agent for the solar cell after texturing is put into the alkali solution to prepare a cleaning solution for the solar cell after texturing, a silicon wafer is put into the cleaning solution for cleaning the solar cell after texturing, the cleaning agent does not volatilize and has no pungent smell, and the cleaning agent can be used for cleaning the silicon wafer after texturing. The cleaning effect is not weaker than that of an original hydrogen peroxide process, the use amount of hydrogen peroxide can be effectively reduced, inorganic particles and organic stains on the surface of the silicon wafer can be effectively removed, and the cost of chemicals and the danger in the using process are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a cleaning agent and a cleaning process for solar silicon chips after texturing. Background technique [0002] With the depletion of conventional energy sources and the increasingly prominent environmental problems, new energy sources with environmental protection and renewable characteristics have been paid more and more attention by governments of various countries. The development and utilization of new energy sources have become the focus of global attention. Pollution, renewable, non-regional and other advantages are favored by people, and the solar photovoltaic industry has also developed rapidly. [0003] In the solar cell manufacturing process, the texturing process is an extremely important link. The texturing process mainly includes: (1) Pre-cleaning: the purpose is to remove the mechanically damaged layer on the surface of the original silicon wafer and the impurit...

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Problems solved by technology

[0004] It is inevitable to introduce impurities such as organic and inorganic substances during the manufacturing process of solar cells. These impurities will form recombination centers when they remain on the surface of silicon wafers, which will inevitably cause losses to the open circuit voltage and short-circuit current of the solar cells, and eventually lead to a decrease in the efficiency of solar cells.

However, in the traditional cell manufacturing process, hydrogen peroxide is used for cleaning after texturing. This cleaning process has the following disadvantages: (1) hydrogen peroxide is a strong oxidizing substance, and there is danger in the use process; (2) hydrogen peroxide Unstable and easily consumed during use, so this cleaning process consumes a large amount of hydrogen peroxide, resulting in high chemical costs

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