近些年来由于低成本、低耗能和少污染等特点，铸造多晶硅已成为主要的光伏材料之一，越来越受到人们的广泛关注。但通过定向凝固工艺获得的粗大的晶体中存在大量的孪晶，认为孪晶就有可能对晶体生长起着主导作用。采用自行设计的真空电磁感应熔炼炉及定向凝固炉对冶金级多晶硅进行了真空条件下的定向凝固实验，通过对定向凝固铸锭的观察和分析并结合国内外其它研究机构在此方面的研究，对铸造多晶硅中平行孪晶的生长机制和小平面枝晶的生长机制进行了详细的分析和讨论。
In recent years,cast polycrystalline silicon had become a one of major photovoltaic because of its low cost,low energy consumption and less pollution and other advantages and it received wide attention.However, there were a lot of twins in the coarse columnar grain obtained by directional solidification process.We believed that twin was likely to play a leading role on the crystal growth.The vacuum melting furnace and directional so-lidification furnace which were designed by us were used to refine metallurgical grade silicon (MG-Si)under vacuum conditions.The growth mechanism of parallel twins and small plane dendritic growth mechanisms in casting polycrystalline silicon were analyzed and discussed in detail based on the observation and analysis of di-rectional solidification test of our group and the research in this area of other research institutions at home and abroad.
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