Preparation method of textured structure of crystalline silicon solar cell

Abstract

The invention discloses a preparation method for texture structure of crystalline silicon solar cell, comprising the following steps: 1) placing a silicon wafer into an alkaline solution and removing the damage layer on the silicon wafer surface; 2) placing the silicon wafer in an acidic solution and reducing the structural differences between the different crystal grains; 3) forming a porous layer structure on the surface of the silicon wafer obtained from step 2; and 4) conducting surface etching with a first chemical etching solution for the texture structure of crystalline silicon solar cell. According to the method of the invention, the surface of the silicon wafer undergoes a pretreatment first, that is, the removal of the damage layer in alkali solution, and then proceeds to the homogeneous corrosion in the acid solution. The cooperated use of the two finally forms the surface structure suitable for preparing the nanometer texture, which is obviously advantageous in terms of photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a method for preparing a textured surface structure of a crystalline silicon solar cell, belonging to the technical field of solar cells. Background technique [0002] With the wide application of solar cell components, photovoltaic power generation occupies an increasingly important proportion in new energy and has achieved rapid development. Among the current commercialized solar cell products, crystalline silicon (monocrystalline and polycrystalline) solar cells have the largest market share, maintaining a market share of more than 85%. [0003] At present, in the production process of solar cells, the textured structure on the surface of silicon wafers can effectively reduce the surface reflectance of solar cells, which is one of the important factors affecting the photoelectric conversion efficiency of solar cells. In order to obtain a good textured structure on the surface of crystalline silicon solar cells to achieve a ...

AI Technical Summary

Problems solved by technology

[0005] However, for the currently popular metal-catalyzed corrosion texturing method, there are few pre-treatment procedures for silicon wafers. Generally, it is only cleaning, and there is also a process of using a mixture of lye and additives to remove damage.

However, in practical applications, it is found that: (1) After treatment with lye, a micro-protrusion structure will be formed on the surface of the silicon wafer, which is not conducive to the subsequent attachment of nano-metal particles or poor adhesion uniformity, affecting the metal Catalytic corrosion texturing method; (2) After alkali treatment, the surface appearance of the silicon wafer is more obvious, which is not conducive to the subsequent coating process, and eventually causes the appearance of the silicon wafer to be poor; (3) It is necessary to use additives to control the alkali reaction, The additives are macromolecular chemicals, which will inevitably increase the cost of texturing on the one hand, and will also increase the pressure on environmental protection