Industrialized production process of crystalline silicon solar battery

Abstract

The invention discloses an industrialized production process of a crystalline silicon solar battery, which comprises the following steps of: selecting a silicon chip; performing front surface matte making, phosphorous diffusion, the removal of phosphorosilicate glass formed on the surface during the phosphorous diffusion, and the deposition of silicon nitride on the front surface through PECVD inturn, and then putting an anti-reflecting film protected silicon ship provided with the front surface silicon nitride into heated alkali liquor to perform back polishing so as to remove a diffusion layer on the back surface; and washing and drying the silicon chip, and printing and sintering the silicon chip by adopting a bending-resistant aluminum paste silk screen. The process adopts a chemicalmethod to replace a plasma etching process, realizes non-contact of a matte surface of the silicon chip in the whole production flow, avoids matte surface damages caused by silicon chip friction, so the probability of electric leakage after facade silver paste sintering is reduced; the flat and clean back surface is favorable for the reaction of aluminum and silicon during the sintering to form amore uniform aluminum back surface field; and a polished surface has a stronger reflex action compared with an irregular matte surface, and can increase the absorption of incident light, improve the spectral response of the long-wavelength of a battery chip, and significantly improve a short-circuit current and an open-circuit voltage.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to an industrialized production process of crystalline silicon solar cells. Background technique [0002] With the decrease of fossil energy reserves and various environmental problems caused by the greenhouse effect, people's demand for new energy is getting stronger and stronger. As a photoelectric conversion device, solar cells are the most direct way to obtain solar energy. In recent years, the world output of solar cells has been growing at a high rate of 30% to 40% per year, becoming one of the fastest growing industries. [0003] At present, crystalline silicon solar cells are the mainstream of photovoltaic products, accounting for about 90% of the market share. Domestic crystalline silicon production lines are basically designed according to the battery production process of texturing, diffusion, plasma etching, phosphosilicate glass cleaning, silicon nitri...

AI Technical Summary

Problems solved by technology

[0008] Although the above-mentioned methods can reduce the adverse effects of the double chemical etching of the silicon wafer, control the curvature of the battery, and reduce the generation of debris, it is still necessary to stack the silicon wafers together for edge etching, which cannot directly avoid the damage of the suede surface. possibility

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