| Research and development of clean, renewable energy are effective solutions to these challenges. Solar cells can convert sunlight to electrical energy, this is very significant to promoting environmental protection. Monocrystalline silicon solar cells holds a central position in the solar cell industry, and its silicon surface texturing technology is an important part of the solar cell preparation process. Pyramid structure was formed on the silicon surface through chemical reaction with alkaline solution and silicon. This will result in multiple reflections of light and increase of absorption efficiency.Monocrystalline silicon texturization with K3PO4/K2SiO3 was an attractive etching solution for reducing the reflectivity on silicon. We investigated that silicon topography and reflectivity changing with K3PO4 concentration, K2SiO3 concentration, texturing time, texturing temperature. The optimum concentration, temperature, texturing time for pyramid and reflectance have also been studied. We found that the increase of K3PO4 concentration resulted in the reduction of the pyramid size and then becoming larger. A small quantity of K2SiO3 solution is conducive to formation of pyramid. The increase in temperature resulted in the reduction of pyramid size and density, but the density increase with high temperature. The increase in texturing time resulted in the reduction of the pyramid size and density.The average reflectivity obtained in an optimal condition(0.5wt% K3PO4, 0.5wt% K2SiO3, 85℃, and 20 min) was close to 11.36%, and in an optimal condition(1wt% K3PO4, 1wt% K2SiO3, 60℃, and 40 min) was close to 10.48%. The pyramid size and density obtained with an optimal condition(25wt% K3PO4, 2wt% K2SiO3, 92℃, 20min) were close to 0.32μm and 90.0%. With the condition(25wt% K3PO4, 2wt% K2 Si O3, 92℃, 40min) The pyramid size and density were 0.3μm and 100%. This technique provides an alternative way for producting high-efficiency silicon solar cells. |
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