Abstract
Directional solidification is one of the key technologies of multi-crystalline silicon ingots in commercial photovoltaic market. During the directional solidification process, the changes of technologic parameters will influence the temperature gradient and the shape of the solid-liquid interface, which determine the qualities of polycrystalline ingots. In this paper, the relationship between the crucible lower rates with the temperature gradient and the shape of the solid-liquid interface were studied by numerical simulations. The results showed that when the crucible lower rate is less than 60mm/h , the temperature gradient is getting larger with the increase of crucible lower rate, and the shape of solid-liquid interface remains convex. But when the crucible lower rate is higher than 60mm/h, the shape of solid-liquid interface changes into concave.
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