Method for cleaning solar cell silicon wafer after polishing

A technology for polishing solar cells and silicon wafers, which is applied in the direction of cleaning methods using liquids, cleaning methods and utensils, chemical instruments and methods, etc., which can solve problems such as efficiency reduction and leakage, and achieve good texturing effects and a wide process control window , The effect of increasing the open circuit voltage
CN103441187AInactive Publication Date: 2013-12-11昊诚光电(太仓)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
昊诚光电(太仓)有限公司
Publication Date
2013-12-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for cleaning a solar cell silicon wafer after polishing. The method includes the following steps that (1) the solar cell silicon wafer after polishing is subjected to acid cleaning, and (2) the solar cell silicon wafer after acid cleaning is subjected to mixed acid cleaning, alkali cleaning and acid cleaning. In the step (2), mixed acid of hydrofluoric acid and nitric acid is used for the mixed acid cleaning, sodium hydroxide solutions or potassium hydroxide solutions are used for the alkali cleaning, and mixed acid of hydrofluoric acid and hydrochloric acid is used for the acid cleaning. The method is simple and convenient to operate, capable of efficiently eliminating various pollutions, generated in the polishing process, of the solar cell silicon wafer, and capable of obviously improving open-circuit voltages of silicon wafer products, and good technological support is provided for mass production of back polishing cells and back passivating cells.
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Description

technical field

[0001] The invention relates to a method for preparing a silicon wafer of a battery, and more particularly to a method for cleaning a silicon wafer of a solar battery after polishing. Background technique

[0002] Solar cells have developed from the initial immaturity to the current mature crystalline silicon cell technology. With the continuous emergence of various high-efficiency cells, not only the technology and materials are constantly being innovated, but also the technology is constantly innovating. Compared with the production process, the preparation process of the crystalline silicon solar cell structure in the back electric field area in the laboratory is not only high in production cost, but also complicated and cumbersome, and has not yet been applied to commercial production on a large scale. The main difference between the crystalline silicon battery in contact with the back electric field area and the ordinary crystalline silicon battery is th...

Claims

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