Preparation method of novel composite textured structure of crystalline silicon solar cell

Abstract

The invention provides a preparation method of a novel composite textured structure of a crystalline silicon solar cell. The method is a method for preparing a high-quality anti-reflection composite textured structure based on multiple reflection and absorption on the surface of crystalline silicon by using laser etching and a spin coater. Compared with other single laser texturing means, the method can form an optical fiber type composite textured structure. The ultralow-reflectivity composite textured structure is obtained by regulating and controlling geometric parameters of a microstructure array and selecting a thin film material. According to the method, AutoCAD is used for simulating and calculating the influence of the bottom corner of the microstructure on the number of times of reflection in the composite textured structure, meanwhile, a crystalline silicon surface micro-unit model is established through a finite difference time domain method, the light absorption effect of the microstructure under the condition of vertical incidence is simulated and calculated, and the optimal parameter of the size of the microstructure is obtained. The method provided by the invention is efficient and controllable, has no pollution to the environment, and can further greatly reduce the surface reflectivity of the crystalline silicon and improve the conversion efficiency of the solar cell.

Description

technical field [0001] The invention belongs to the field of solar cell preparation, and in particular relates to a method for preparing a composite suede structure with low reflectivity by combining laser etching and film deposition to improve the photoelectric conversion efficiency of solar cells. Background technique [0002] With the rapid development of the global economy, the increase of the population base, and the higher and higher living demands, energy consumption and environmental pollution are becoming more and more serious, resulting in less and less resource reserves. Traditional oil, coal, natural gas, etc. Non-renewable energy sources are increasingly depleted. It is imperative to optimize the energy structure and vigorously develop clean and green renewable new energy, and solar energy is favored by people because of its extensiveness, abundance, safety and cleanliness. "inexhaustible" resource and become the most potential renewable energy source. It is e...

AI Technical Summary

Problems solved by technology

Although the cost of this method is low and the process is relatively mature, there are not only problems such as the need for high-cost reaction solutions, the potential explosiveness of waste gas and waste agents, and the safety threats to personnel during chemical treatment.

Moreover, due to the bubbles generated during the reaction process, the chemical etching solution cannot completely contact the wafer surface, resulting in incomplete and uneven etching, and the surface tension of the liquid is not conducive to etching very fine lines, so the reflectance of the textured surface is generally biased. High, the reflectivity of monocrystalline silicon pyramidal textured surface at 300-1100nm wavelength is generally above 10%