Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 128, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2021.105754
Keywords
Si?Fe alloy; Purification; Directional-solidification; Bulk Si
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Funding
- National Science Foundation of China [51604023]
- Fundamental Research Funds for the Central Universities [FRFBD2004A]
- High Steel Center (HSC) at Yanshan University
- Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM)
- Beijing Key Laboratory of Green Recycling and Extraction of Metals
- High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing (USTB) , China
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The study found that when growing bulk Si from Si-Fe alloy, metal and oxide impurity particles form in the melt, which are captured by bubbles and ultimately aggregate or float as a slag layer. Some impurities segregate at the solid Si/liquid Si-Fe interface and enrich in the alloy phase. Based on these characteristics, a potential production technology is proposed.
Bulk Si was grown from Si?Fe alloy using the directional-solidification technique. Some metal and oxide impurity particles, such as Fe?Si?Al and Si?Al?Ca?O, formed in the Si?Fe melts. These particles were captured by the bubbles in the melt and finally aggregated in the bubbles or/and floated as a slag layer. Some impurities with a low segregation coefficient segregated in the solid Si/liquid Si?Fe interface and were finally enriched in the alloy phase. According to the distribution characteristics of impurity and impurity particles, a potential production technology for bulk Si based on purifying alloy melts and growing bulk Si is proposed. This technology mainly consists of two steps: a pre-purification treatment of Si?Fe alloy and a directional-solidification treatment of bulk
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