Purification of metallurgical-grade silicon up to solar grade

N. Yuge, M. Abe, K. Hanazawa, H. Baba, N. Nakamura, Y. Kato, Y. Sakaguchi, S. Hiwasa, F. Aratani

Research output: Contribution to journalArticlepeer-review

143 Citations (Scopus)


An estimate has been made of the feasibility of a metallurgical purification process, the NEDO (New Energy and Industrial Technology Development Organization) melt-purification process, for manufacturing solar-grade silicon from metallurgical-grade silicon. Equipment has been developed to pilot manufacturing plant scale. The system comprises an electron-beam furnace for phosphorus removal and a plasma furnace for boron removal Each furnace has a mold for directional solidification to remove metallic impurities. The concentration of each impurity in the silicon ingot purified through the whole process satisfied the solar-grade level The Solar-grade silicon produced showed p-type polarity and resistivity within the range 0.5-1.5 Ωcm.

Original languageEnglish
Pages (from-to)203-209
Number of pages7
JournalProgress in Photovoltaics: Research and Applications
Issue number3
Publication statusPublished - May 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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