| Surface texturization for single crystalline silicon solar cells is an important step in the fabrication process of solar cells.“Pyramid” textured structure can be achieved in the solar cell surface by chemical etching method in alkaline environment,thus the refractive index of the light irradiation on the surface of “Pyramid” textured surface can be greatly reduced.The texturing process of single crystalline silicon solar cells during industrial mass production is primarily using anisotropic etching of each face of single crystalline silicon in sodium hydroxide solution,so that the “Pyramid” structure is formed on the surface of single crystalline silicon.In this paper,the surface texturization for single crystalline silicon solar cells is made in sodium hydroxide solution,and its main characteristics is to form “Pyramid” structure on the surface of silicon chip by the reaction of silicon with sodium hydroxide in the process of surface texturization,thus to control the “Pyramid” structure in a proper range2.5-4?m with interaction of isopropanol and additives.When the incident light reaches the surface of Pyramid structure,the spread of the incident light reflects two times on the silicon surface,thereby reduce the reflectivity,and improve the photocarrierdensity,so as to improve the energy conversion efficiency and to reduce the cost of production.This paper studies the influences of several experimental parameters,such as alkali concentration,reaction temperature and reaction time to the formation of “Pyramid” textured structure in the process of surface texturization for single crystalline silicon solar cells.Through observing the size of the "Pyramid" textured structure and the reflectivity,concentration control in 1.25%,temperature 78 ?,time 20 min,form of single crystal size of "pyramid" is 2.5-4?m,can achieve thebest lower reflectivity of light 11.987%.The conversion efficiency of the cell was increased by 0.07% and the economic efficiency was expected to increase by 0.2%. |
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