A method of using laser rotary cutting to make texture on the surface of crystalline silicon solar cells

Abstract

The invention provides a method for making texture on the surface of crystalline silicon solar cells by laser rotary cutting. Through a series of process experiments and test verifications, laser rotary cutting process parameters, micropore structure parameters of crystalline silicon velvet surface, and crystalline silicon velvet are obtained. The control law between the three surface reflectances, so that the optimized laser rotary cutting process parameter values ​​can be selected from the preset target value of the reflectivity of the crystal silicon texture, so that the measured value of the reflectivity of the crystal silicon texture is greater than or equal to the preset value. target value, and from the crystalline silicon samples that meet the preset reflectivity of the textured surface, find the microporous structure parameters of the textured surface corresponding to all samples that do not affect the deposition quality of the subsequent anti-reflection film, and finally determine the corresponding microporous structure parameters of these textured surfaces The laser rotary cutting process parameters. The invention is based on the surface texture technology of laser rotary cutting, which is green and safe, has no pollution to the environment, and the height of the surface microstructure unit is controllable, which can greatly reduce the reflectivity of the texture surface and improve the conversion efficiency of solar cells.

Description

technical field [0001] The invention belongs to the field of solar cell preparation, and in particular relates to a method for making texture on the surface of a crystalline silicon solar cell by laser rotary cutting. Background technique [0002] With the increasing shortage of non-renewable energy such as coal and oil, the problem of "smog" is becoming more and more serious, and the demand for clean and renewable energy is becoming more and 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 among many solar energy utilization methods. It is an important part of the material revolution and energy revolution in the 20th century. Renewable energy will account for one-third of the total consumption, and solar photovoltaic power generation will account for more tha...

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%.