摘要
采用太阳能级硅(6 N)为原料,铝以及硼作为合金中的杂质研究对象,实验过程中保持硅硼浓度比为常数,改变过程温度及硅铝浓度比.结果显示,杂质硼是从硅固相中迁移至硅铝合金相,从而达到了去除杂质硼的目的.当温度是1 623 K,硅铝质量比为5:4的条件下除硼的效果最好,此时硼的去除率达到了 87.8％;这表明温度和硅铝质量比是影响除硼效果的重要因素,在更低的温度和硅铝质量比条件下,可以更有效地去除硅中的硼杂质.另外,也对硅固相中硼的活度进行了研究,得出了硅固相中硼的活度的表达式.结果显示,硅固相中硼的活度与温度成反比,与硅固相中硼的含量成正比.
Abstract
Solar grade silicon(6 N)was adopted as raw material,aluminum and boron as impurity research objects in Si-Al Alloy.Concentration ratio of silicon to boron was kept constant during the experiment,then changed the process temperature and the ratio of Si to Al concentration.The result shows that impurity Boron moves from solid Si phase to Si-Al alloy phase,and thus the purpose of Boron removal is achieved.The most obvious effect of Boron removal are under the condition of temperature at 1 623 K and the condition of mass ratio of silicon to aluminum at 5∶4,the removal rate of Boron has reached 87.8％.It infers that temperature and mass ratio of silicon to aluminum are important factors affecting the boron removal efficiency.Under lower temperature and mass ratio of silicon to a-luminum conditions,boron impurities can be removed more effectively from silicon.What's more,the activity of Boron in solid Si phase is also studied,the expression of the activity of Boron has been obtained.It is found that the activity of Boron in solid Si phase is inversely proportional to the temperature and proportional to the content of Bo-ron in solid Si phase.
基金项目
广东省智能光伏产品工程技术开发中心(2019GGCZX003)
广东省绿色低碳新能源电源技术产教融合创新平台(2023CJPT014)
NETL
NSTL
万方数据