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为了去除工业硅中的杂质制备太阳能级硅,根据工业硅凝固过程中铝在固相和液相中溶解度的差异,采用定向凝固法去除工业硅中的杂质铝.实验结果表明,铝的去除效率可达98%,说明利用定向凝固法去除工业硅中的铝是可行的.但由于在结晶过程中晶界上会富集部分铝元素,因而定向凝固法并不能除去这一部分杂质.结合金相实验中样品腐蚀前后晶界上的变化,可以知道利用酸浸可以除去晶界上的杂质铝.还研究了先酸浸后定向凝固法相结合除铝,实验结果表明铝的含量可以降到1.6×10-5,铝的去除率达98.6%.

参考文献

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