Texturing method for pretreating surface of monocrystalline silicon wafer by adopting electrochemical method

Abstract

The invention relates to a texturing method for pretreating the surface of a monocrystalline silicon wafer by adopting an electrochemical method, which comprises the following steps of: immersing the monocrystalline silicon wafer with a damaged layer removed in an electrolyte solution, taking the monocrystalline silicon wafer as an anode, taking graphite or stainless steel as a cathode, applying direct current voltage between the anode silicon wafer and the cathode, taking the anode silicon wafer as a voltage anode, taking a cathode of a counter electrode as a voltage cathode, and performing electrochemical pretreatment on the surface of the silicon wafer, and then putting the monocrystalline silicon wafer into a texturing solution for texturing to obtain a textured surface with a pyramid structure. According to the method, the growth time of the silicon wafer textured pyramid can be shortened, and the pyramid size distribution is more uniform, so that the uniform and fine high-quality textured surface is obtained. The low-voltage electrolysis method is adopted, the process investment is low, the energy consumption is small, and the high-efficiency and low-cost requirements of photovoltaic power generation at the present stage are met. The low-voltage electrolysis method is adopted, reaction conditions are mild, reaction can be carried out at normal temperature, no harm is caused to human bodies and the environment, the structure is simple, operation is convenient, and control is easy.

Description

technical field [0001] The invention belongs to the technical field of solar cell surface treatment, and in particular relates to a texturing method for pretreating the surface of a single crystal silicon wafer by an electrochemical method. Background technique [0002] The process of texturing the surface of solar cells to form an effective anti-reflection effect is called texturing, which is one of the important means to increase the efficiency of solar cells. At present, the corrosion method using cheap alkaline solution system has been widely used in industry. Single crystal silicon wafers can form a pyramid-like texture structure on the surface through anisotropic corrosion in alkaline solution, and the incident light passes through the silicon wafer surface. Multiple reflections increase the absorption of light by solar cells, thereby reducing the reflectivity of the silicon wafer surface. However, the size of the pyramid structure obtained by this process is not unif...

AI Technical Summary

Problems solved by technology

[0003] However, hydrogen peroxide is a dangerous corrosive drug, chemically unstable and easily decomposed, and can react with combustibles to release a large amount of heat and oxygen, causing fire and explosion

In the actual solar cell manufacturing process, the consumption of hydrogen peroxide used for texturing is relatively large. The concentration of hydrogen peroxide on the market is mostly 30%-35% high-concentration products, which are highly corrosive and have a high risk factor. If not leaked or handled improperly It will cause great harm to the environment, which also leads to high requirements for its transportation and storage, resulting in a significant increase in the cost of battery preparation, so it is very necessary to replace hydrogen peroxide

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