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Indexed by:期刊论文

Date of Publication:2011-08-01

Journal:Gongneng Cailiao/Journal of Functional Materials

Included Journals:EI、PKU、ISTIC、Scopus

Volume:42

Issue:SUPPL. 4

Page Number:674-676+680

ISSN No.:10019731

Abstract: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.