Purification Efficiency and B Removal of Polysilicon during its Solidification from a Si-Al-Sn Melt

Abstract:

Solar grade silicon (SoG-Si) is the basic material of photovoltaic industry. Metallurgical method as a way of purification isconsidered to reduce the cost of polysilicon production unanimously based on its low cost, short production cycle, relatively simple process, lowpollution and controllable scale size, and it has become a hot topic in the subject research around the world.In this paper Al-Si-Sn alloy is used to purifypolysiliconand influence on the purification efficiency of polysilicon with different compositions of Al-Si-Sn alloy is analyzed. In order to study the segregation of impurity B in purification process, we introduce final segregation coefficient k_B,final and analyze the relation between k_B,final and the content of Al,Snin Al-Si-Sn alloy thermodynamically.

• Periodical: Advanced Materials Research (Volume 772)
• Pages: 68-71
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.772.68
• Online since: September 2013
• Authors: Shen Rui Wu, Fu Min Xu, Jia Yan Li, Yi Tan, Ya Qiong Li
• Keywords: Al-Si-Sn Alloy, Polysilicon, Purification Efficiency, Segregationcoefficient

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