Production of Solar-Grade Silicon by the SiF4 and Mg Reaction View Full Text


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Article Info

DATE

2016-12

AUTHORS

Xiaobing Xie, Jianer Bao, Angel Sanjurjo

ABSTRACT

Over 90 pct of the solar cells currently produced and installed are Si based, and this industrial dominance is expected to persist for the foreseeable future. The crystalline Si substrate accounts for a significant portion of the total cost of solar cells. In order to further reduce the cost of solar panels, there has been significant effort in producing inexpensive solar-grade Si, mainly through three paths: (1) modification of the Siemens process to lower production costs, (2) upgrading metallurgical-grade Si to reach solar-grade purity, and (3) by means of new metallurgical processes such as the reduction of a silicon halide, e.g., SiF4 or SiCl4, by a reactive metal such as Na or Zn. In this paper, we describe an alternative path that uses Mg to react with SiF4 to produce low-cost solar grade Si. Experimental conditions for complete reaction and separation of the products, Si and MgF2, as well as aspects of the reaction mechanism are described. The reaction involves both a heterogeneous liquid-gas phase reaction and a homogeneous gas-gas phase reaction. When pure Mg was used, the Si product obtained had sub-ppm levels of B and P impurities and is expected to be suitable for solar cell applications. More... »

PAGES

299-307

References to SciGraph publications

  • 1984-12. The Mg−Si (Magnesium-Silicon) system in BULLETIN OF ALLOY PHASE DIAGRAMS
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s40553-016-0095-8

    DOI

    http://dx.doi.org/10.1007/s40553-016-0095-8

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