A kind of texturing process of solar cell silicon wafer

Abstract

The invention provides a texturing process for silicon wafers of solar cells, which belongs to the technical field of solar cells, and specifically includes: 1) surface pretreatment: pretreating silicon wafers of solar cells with a pretreatment liquid; The cleaned solar cell silicon wafers are etched and textured, and the texturizing liquid used is the texturing liquid prepared by the aforementioned method; 3) Surface cleaning: the solar cell silicon wafers after texturing are cleaned with an alkaline solution. During the texturing process, adding xylan esterified derivatives to the texturing liquid can not only obtain a finely uniform microstructured textured surface, but also effectively reduce the reflectivity of polycrystalline silicon solar cells to sunlight, improve the photoelectric conversion efficiency, and improve the efficiency of silicon wafers. Less loss.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a texturing process for silicon wafers of solar cells. Background technique [0002] With the massive burning of fossil fuels, environmental pollution is becoming more and more serious, and clean and pollution-free energy has attracted more and more attention from all over the world. As a new type of clean and pollution-free energy, solar cells are used more and more widely. A solar cell is a semiconductor device that converts solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy will be output through the electrodes. Solar cells can be manufactured from a variety of semiconductors, and one of the commonly used semiconductor materials is crystalline silicon, but silicon wafers for solar cells have the problem of high surface reflectivity. In order to solve th...

AI Technical Summary

Problems solved by technology

At present, in the industrial production of polycrystalline silicon solar cells, the acid solution system is generally used to prepare polycrystalline suede. Generally, a mixed solution of hydrofluoric acid and nitric acid is used to etch the surface of silicon wafers, and the isotropy of polycrystalline silicon in hydrofluoric acid and nitric acid solutions is used. Corrosion, forming similar pit-like suede on the surface of different grains of the silicon wafer, but the texturing effect of this acid solution is not very ideal, there are large suede size and poor uniformity, and color difference between different grains Obvious, macroscopic appearance such as black line-like deep corrosion pits, high surface reflectivity, poor texture stability, etc.

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