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Removal of inclusions from silicon

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Abstract

The removal of inclusions from molten silicon is necessary to satisfy the purity requirements for solar grade silicon. This paper summarizes two methods that are investigated: (i) settling of the inclusions followed by subsequent directional solidification and (infiltration by ceramic foam filters. Settling of inclusions followed by directional solidification is of industrial importance for production of low-cost solar grade silicon. Filtration is reported as the most efficient method for removal of inclusions from the top-cut silicon scrap.

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Authors and Affiliations

  1. Department of Metallurgy, SINTEF Materials and Chemistry, Alfred Getz Vei 2B, Trondheim, NO-7465, Norway

    Arjan Ciftja, Anne Kvithyld & Eivind Johannes Øvrelid

  2. Department of Material Sciences and Engineering, Norwegian University of Science and Technology, Alfred Getz Vei 2B, Trondheim, NO-7491, Norway

    Thorvald Abel Engh & Merete Tangstad

Authors
  1. Arjan Ciftja
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  2. Thorvald Abel Engh
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  3. Merete Tangstad
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  4. Anne Kvithyld
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  5. Eivind Johannes Øvrelid
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Correspondence to Arjan Ciftja.

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Ciftja, A., Engh, T.A., Tangstad, M. et al. Removal of inclusions from silicon. JOM 61, 56–61 (2009). https://doi.org/10.1007/s11837-009-0168-6

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  • DOI: https://doi.org/10.1007/s11837-009-0168-6

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