Method for preparing solar cell

Abstract

The invention provides a method for preparing a solar cell, comprising cleaning the surface of a silicon wafer; successively texturing the silicon wafer for the first time and the second time to formthree textured surfaces, wherein one textured surface is located on one side of the silicon wafer, and the other two textured surfaces are located on the other side of the silicon wafer; subjecting the silicon wafer to phosphorus diffusion by using a quartz boat to form three PN junctions, wherein the quartz boat is provided with a plurality of fences arranged at intervals; etching the silicon wafer to remove phosphosilicate glass on the surface of the silicon wafer; forming an antireflection film on the surface of the silicon wafer; producing top and bottom electrodes on the surface of the silicon wafer; sintering the silicon wafer in a sintering furnace; and testing the performance of the sintered solar cell. The method, by increasing the PN junctions, can improve the collection of carriers, and greatly improve the conversion efficiency of the solar cell.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a solar cell. Background technique [0002] As the greenhouse effect becomes more and more obvious, people pay more and more attention to the ecological environment. As one of the clean energy industries, the solar energy industry is developing rapidly at this stage, among which silicon cells are the most widely used, so the improvement of its efficiency has always attracted people's attention. [0003] At present, the practice of traditional silicon wafer solar cells is to dope one side of a silicon semiconductor into a P-type semiconductor and the other side into an N-type semiconductor, and a single special thin layer will be formed at the interface of the two semiconductors. That is to form a PN junction to realize the conversion of solar energy. [0004] However, the working process of silicon wafer solar cells is mainly that electrons absorb lig...

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Problems solved by technology

[0004] However, the working process of silicon wafer solar cells is mainly that electrons absorb light energy to form free electrons, which are back-transmitted to the negative electrode through the electrode to form current or be collected. In traditional silicon wafer solar cells, the cell diffusion layer is relatively thin and forms a single PN junction. The sunlight is a mixed spectrum, therefore, the solar cells prepared by the traditional method will cause part of the light not to be fully utilized, so that part of the sunlight directly penetrates the battery and is wasted, thus affecting the conversion efficiency of solar energy

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