Takeshi YOSHIKAWA, Kazuki MORITA
The production of polycrystalline silicon (poly-Si) for solar cells has faced significant challenges due to resource shortages from the semiconductor industry. This study aims to develop a novel metallurgical refining process for solar grade silicon (SOG-Si) using metallurgical grade silicon (MG-Si) as the primary material. The methodology involves a low-temperature solidification process that incorporates silicon-aluminum (Si–Al) melt, focusing on leveraging the thermodynamic properties of impurities in solid silicon. Key steps include alloying MG-Si with aluminum to create a Si–Al solvent, followed by solidification and the subsequent collection of silicon crystals through acid leaching. Critical to the process is controlling the solidification of silicon, which was initially hampered by kinetic limitations. Advances were made in agglomerating needle-like silicon crystals under a fixed alternating magnetic field, significantly reducing losses during acid leaching. Results indicate a minimal required aluminum content for effective solidification, demonstrating economic potential for refining processes in silicon production. This research offers insights into improving the cost-effectiveness and efficiency of solar cell production methods.
@article{e1b5f526-c3b7-4efa-a011-136b4244f4a2,
title={Continuous Solidification of Si from Si},
author={Takeshi YOSHIKAWA and Kazuki MORITA},
year={2026},
language={en}
}TY - JOUR TI - Continuous Solidification of Si from Si AU - Takeshi YOSHIKAWA AU - Kazuki MORITA PY - 2026 LA - en ER -
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