Method for texturing surface of crystalline silicon solar cell by laser rotary cutting

Abstract

The invention provides a method for texturing the surface of a crystalline silicon solar cell by using laser rotary cutting. A control rule among laser rotary cutting process parameters, crystalline silicon textured surface micropore structure parameters and crystalline silicon textured surface reflectivity is obtained through a series of process experiments and test verification, so that optimized laser rotary cutting process parameter values can selected by starting from a preset crystalline silicon textured surface reflectivity target value, the measured value of the crystalline silicon textured surface reflectivity is enabled to be greater than or equal to the preset target value, textured surface micropore structure parameters corresponding to all samples which do not influence the deposition quality of the subsequent antireflection film are found from the crystalline silicon samples meeting the preset textured surface reflectivity, and finally laser rotary cutting process parameters corresponding to the textured surface micropore structure parameters are determined. The method is a surface texturing technology based on laser rotary cutting and is green, safe and free of pollution to the environment, the height of the surface microstructure unit is controllable, the textured surface reflectivity can be greatly reduced, and the conversion efficiency of the solar cell is improved.

Description

Technical field [0001] The invention belongs to the field of solar cell preparation, and specifically relates to a method for making texturing on the surface of a crystalline silicon solar cell by laser rotary cutting. Background technique [0002] With the increasing shortage of non-renewable energy sources such as coal and petroleum, the "smog" problem has become more and more serious, and the demand for clean and renewable energy has become more urgent. It has become an inevitable trend to seek clean energy that can replace traditional fossil fuels. Since the discovery of the photoelectric effect in 1839, solar photovoltaic power generation has become one of the most important and promising technologies in many solar energy utilization methods. It is an important part of the material revolution and energy revolution in the 20th century. It is expected that by 2030, the global energy Renewable energy will account for one-third of the total consumption, while solar photovoltaic ...

AI Technical Summary

Problems solved by technology

Although the cost of wet chemical texturing technology is low and the process is relatively mature, the chemical reaction process is relatively complicated, and there are many intermediate products in the reaction, accompanied by gas generation, and the prepared microstructure units are randomly distributed, and the size of the units is not easy to control. The process is highly customized, so the reflectance of the textured surface is generally high. The reflectivity of the monocrystalline silicon pyramid textured surface at 300-1100nm wavelength is generally above 10%, and the polycrystalline silicon porous textured surface is generally above 15%.