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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 391-392Electrolysis Process for Preparation of Solar...

Electrolysis Process for Preparation of Solar Grade Silicon

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Abstract:

Studied on electrorefining metallurgical grade silicon to prepare solar grade silicon(SOG-Si) with electrochemical method in molten KCl and NaF mixture salt. Molten KCl and NaF mixture salt as electrolyte, the metallurgical grade silicon as anode and little metal nickel crucible for collecting silicon powder as cathode, electrorefining experiments were performed at 800 and 2.0V for 14h under dry argon atmosphere. The results showed that the metallurgical grade silicon could be dissolved and deposited on the cathode through molten potassium chloride (KCl) and sodium fluoride (NaF) mixture salt electrolyte. The nickel crucible was full of deposit, which was pure silicon by XRD and EDS. Purity of refined silicon was close to 99.99%, most of impurities like B and P were reduced significantly. Impurity level of silicon was reduced to the desired range for SOG-Si by advancement of the materials for the cell components.

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Periodical:

Advanced Materials Research (Volumes 391-392)

Pages:

697-702

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.391-392.697

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Online since:

December 2011

Authors:

Xiang Yu Zou, Hong Wei Xie, Yu Chun Zhai, Xiao Chuan Lang, Jun Zhang

Keywords:

Electrorefining, KCl-NaF, Metallurgical Grade Silicon, Solar Grade Silicon

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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