Single nanometer pile face preparation method of crystalline silicon solar cell

Abstract

Disclosed in the invention is a single nanometer pile face preparation method of a crystalline silicon solar cell. The preparation method comprises the following steps: S1, cleaning and corroding silicon wafers to remove damage layers, thereby forming micron-order pile faces; S2, overlaying each two silicon wafers and then inserting the silicon wafers into a silicon wafer basket, and placing the silicon wafer basket into deionized water to enable the deionized water to enter the space the two silicon wafers completely; S3, lifting the silicon wafer basket out of the deionized water surface to enable the water between the overlaid two silicon wafers to flow out of the space and keeping a water membrane for bonding with the silicon wafers between the two overlaid silicon wafers, thereby forming a composite structure with the silicon wafer, the water membrane, and the silicon wafer successively; S4, carrying out a nanometer pile preparing process on the composite structure with the silicon wafer, the water membrane, and the silicon wafer in the silicon wafer basket to obtain nanometer pile faces at the two sides of the composite structure; and S5, separating the composite structure to obtain a silicon wafer with a single nanometer pile face. According to the invention, the half of the catalysis metal consumption can be reduced and thus the production cost is substantially lowered; the wafer installation amount is double in one basket and the production efficiency is doubled.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a single-sided nano-velvet surface of a crystalline silicon solar cell. Background technique [0002] Photovoltaic power generation is an important component of new energy, and has achieved rapid development in recent years. Among the current commercialized solar cell products, crystalline silicon (monocrystalline and polycrystalline) solar cells have the largest market share, and have maintained a market share close to 90%. [0003] At present, in the production process of crystalline silicon solar cells, the purpose of the textured process is to reduce the surface reflectance of the solar cell, thereby improving the photoelectric conversion efficiency of the solar cell. In order to obtain a textured structure with excellent performance on the surface of crystalline silicon wafers, the photovoltaic industry has tried many methods, such as mechanical g...

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Problems solved by technology

[0011] In the existing catalytic metal-assisted wet chemical etching method, the consumption of catalytic metal accounts for a

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