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论文类型：期刊论文

发表时间：2011-08-01

发表刊物：Gongneng Cailiao/Journal of Functional Materials

收录刊物：EI、PKU、ISTIC、Scopus

卷号：42

期号：SUPPL. 4

页面范围：674-676+680

ISSN号：10019731

摘要：Today polysilicon has become the most important PV materials. The production of casting polysilicon ingot by directional solidification process has become a widely used method, but polycrystalline silicon ingots which are got by this process still have some defects. For example, low materials utilization, heterogeneous organization and so on. In order to further optimize the casting process, in this paper, self-designed vacuum induction melting furnace and directional solidification furnace were used for directional solidification experiments. The effect of quartz crucible and quartz ceramics crucible on ingot quality was investigated. The results showed that ingot with better surface quality and relatively well-developed coarse columnar grain structure can be obtained by use of silica ceramic crucibles coated high-purity silicon nitride. The average grain size of ingot is 3-4mm. Meantime, nitride coatings can also effectively reduce the oxygen impurity content in silicon ingot.