Coupling of Metallurgical Method to Remove Impurities in Solar Grade Polysilicon

【Author】

LI Peng-Ting;WANG Kai;JIANG Da-Chuan;REN Shi-Qiang;TAN Yi;AN Guang-Ye;ZHANG Lei;GUO Xiao-Liang;WANG Feng

【Institution】

School of Materials Science and Engineering, Dalian University of Technology;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province;School of Materials Science and Engineering, Dalian University of Technology;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province;School of Materials Science and Engineering, Dalian University of Technology;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province;School of Materials Science and Engineering, Dalian University of Technology;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province;School of Materials Science and Engineering, Dalian University of Technology;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province;New Energy Materials and Technology Institute Co., Ltd. of Dalian University of Technology (Qingdao);New Energy Materials and Technology Institute Co., Ltd. of Dalian University of Technology (Qingdao);New Energy Materials and Technology Institute Co., Ltd. of Dalian University of Technology (Qingdao);New Energy Materials and Technology Institute Co., Ltd. of Dalian University of Technology (Qingdao)

【Abstract】

Preparation of 6N grade polysilicon materials using raw materials of industrial silicon was explored by medium smelting, directional solidification and electron beam smelting. The content of impurities B and P in the samples are both lower than 0.20 ppmw, while the total content of metal impurity (TM) is less than 0.23 ppmw. During the process of removing B by medium smelting, a large proportion of Al and Ca is simultaneously removed through the redox reaction. During the process of electron beam smelting, volatile impurities including P, Al and Ca are further effectively removed by using saturated vapor pressure. Meanwhile, other metal impurities are removed by decreasing beam power, which induces the occurrence of directional solidification. Coupling of metallurgical methods reduces the purification process of polysilicon, and provides the technical support for continuous and large-scale production.

【Keywords】

industrial silicon;medium smelting;directional solidification;electron beam smelting

References

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Total: 25 articles

  • [1] MEI Xiang-yang1,2,MA Wen-hui1,2,DAI Yongnian1,2,WEI Kui-xian1,2,WANG Jing-fu1,2 (1.Faculty of Materials and metallurgical Engineering,Kunming University of Science and Technology,Kunming 650093,China;2.National Engineering Laboratory of Vacuum Metallurgy,Kunming 650093,China), Development and application in preparating solar grade silicon material of directional solidification technology, Light Metals,
  • [2] CAI Jing1,LI Jin-tang1,CHEN Wen-hui1,CHEN Chao2,LUO Xue-tao1 1.Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,China;2.Department of Physics,College of Physics and Mechanical Electronic Engineering,Xiamen University,X iamen 361005,China, Boron removal from metallurgical silicon using CaO-SiO_2-CaF_2 slags, Transactions of Nonferrous Metals Society of China,
  • [3] CAI Jing1,LU Cheng-hao1,LI Jin-tang1,MA Wen-hui2,LUO Xue-tao1(1.College of Materials,Xiamen University,Xiamen 361005,China;2.National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China), Boron removal from metallurgical silicon by plasma melting using electromagnetic induction, The Chinese Journal of Nonferrous Metals,
  • [4] WU Ji-jun1,2,3,MA Wen-hui1,2,3,XIE Ke-qiang1,2,3,WEI Kui-xian1,2,3, ZHOU Yang1,2,3,YANG Bin1,2,DAI Yong-nian1,2,3(1.The National Engineering Laboratory for Vacuum Metallurgy,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093,China;2.Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province,Kunming 650093,China;3.Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities,Kunming 650093,China), Research Progress on Preparation of Solar Grade Silicon Using Metallurgical Route, Journal of Kunming University of Science and Technology(Natural Science Edition),

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