论文名称：Separation of boron from silicon by steam-added electron beam melting
论文类型：期刊论文
发表刊物：SEPARATION AND PURIFICATION TECHNOLOGY
收录刊物：EI、SCIE
卷号：215
页面范围：242-248
ISSN号：1383-5866
关键字：Solar-grade silicon; Boron removal; Electron beam melting; Oxygen self-circulating path; Photovoltaic
摘要：Removal of boron from silicon is a tough task by traditional directional solidification and vacuum refining techniques, due to its large and inappropriate segregation coefficient and low saturated vapor pressure. At high temperature boron react with oxygen to form volatile boron oxides which can be evaporated. So, the removal procedure of boron from silicon melt is investigated by incorporating a small amount of water vapor above the melted surface. The results show that boron is oxidized to mainly form BO and evaporated with 28% removal efficiency by average. It is considered that oxygen atoms experience a series of physical and chemical processes, such as a chemical reaction in the bulk of the melt, evaporation from the melt surface, transportation across the gas phase and ionization due the electron beam, which is conducive to the continuous removal of boron.
发表时间：2019-05-15