Production process of crystalline silicon double-sided solar battery

Abstract

The invention relates to a production process of a crystalline silicon double-sided solar battery, comprising the following steps of: etching to enable a silicon substrate to have an etched face; manufacturing a window which accords with an electrode pattern on a backlight face of the silicon substrate; carrying out heat treatment on the silicon substrate to form a PN junction in the window; washing the silicon substrate; plating at least two layers of antireflection films on a light reflective face of the silicon substrate; plating the antireflection film on a backlight face of the silicon substrate; printing electrode slurry on a silk screen; and sintering to obtain a metal electrode so as to finish the manufacturing of a battery cell. The production process disclosed by the invention is ingenious in concept, is compatible with a conventional industrial battery production line and is easy for industrial manufacture; compared with the conventional solar battery, an electrode grid line is not arranged on the light reflective face of the double-sided solar battery so as to prevent the electrode grid line of the light reflective face from shielding sunlight; the backlight face is provided with a light trapping structure and an antireflection film layer so that the backlight face of the battery also can absorb and utilize the sunlight; and the antireflection films of the light reflective face and the backlight face can passivate the solar battery, so as to be good for improving the efficiency of the battery.

Description

technical field [0001] The invention relates to a production process of a crystalline silicon double-sided solar cell, which belongs to the field of photovoltaics. Background technique [0002] Solar cells are the core components of photoelectric conversion. As far as the applicant knows, the solar cells currently produced in domestic industrialization are conventional P-type solar cells (the base silicon wafer is doped with Group III elements) or N-type solar cells (the base silicon wafer is doped with Group V elements) , are solar cells with double-sided electrodes, that is, the front side (light-facing side) of the solar cell has a grid electrode and the back side (backlight side) of the solar cell has an aluminum back field. There are grid wire electrodes on the front of the conventional battery, which will block part of the incident light, and there is a dead layer in the front (toward the light) diffusion of the solar cell, which is not conducive to the short-wave res...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing crystalline silicon double-sided solar cells such as complex manufacturing process and large equipment investment, and to provide a crystalline silicon double-sided solar cell production process, which is easy for industrial realization and eliminates the need for existing conventional solar cells. Liquid phosphorus source, boron source thermal diffusion step and etching step, improve production efficiency, reduce cost, reduce environmental pollution, and the realization of this process is compatible with industrial conventional solar cell production lines

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