Solar cell and preparation method thereof

Abstract

The invention discloses a preparation method of a solar cell. The preparation method comprises the steps of S1, preparing RIE (Reactive Ion Etching) silicon wafer; S2, carrying out PN diffusion on the surface of the RIE silicon wafer to form a PN diffusion layer and printing a secondary gate pattern on the surface of the PN diffusion layer; S3, covering the secondary gate pattern to evaporate an antireflection film, and preparing a back electrode on the surface of the RIE silicon wafer; and S4, printing a primary gate pattern on the antireflection film, and forming the solar cell after sintering, wherein the primary gate line in the primary gate pattern is vertical to the secondary gate line in the secondary gate pattern. The aspect ratio of the primary thin gate line is improved due to two-time printing, the capacity of collecting carriers can be improved, the ohm contact between the battery electrode and the silicon wafer and the collecting and converging function of the primary gate are enhanced, and the conversion efficiency of the battery electric performance is accordingly improved. The invention also provides the solar cell having the beneficial effect abovementioned.

Description

technical field [0001] The present invention relates to the field of photovoltaic technology, and more specifically, to a solar cell and a method for preparing the solar cell. Background technique [0002] Solar energy is one of the energy sources developed at home and abroad. Using solar cells to absorb solar energy and convert it into electrical energy has great potential and prospects to replace traditional energy sources. Among various solar cells, silicon-based solar cells account for 90% of the total market share. In the preparation process of silicon-based solar cells, the conventional cell preparation process is texturing-diffusion-etching-anti-reflection coating-screen printing-sintering, however, higher production costs and low efficiency have always plagued silicon-based solar cells Factors of development, improving the conversion efficiency of solar cells and reducing production costs are the great challenges we face. [0003] Therefore, how to increase the con...

AI Technical Summary

Problems solved by technology

In the preparation process of silicon-based solar cells, the conventional cell preparation process is texturing-diffusion-etching-anti-reflection coating-screen printing-sintering, however, higher production costs and low efficiency have always plagued silicon-based solar cells Factors of development, improving the conversion efficiency of solar cells and reducing production costs are the great challenges we face

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