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Growth of Quadratic FZ Crystals qFZ

In contrast to the majority opinion, a growing FZ crystal need not necessarily has to rotate. It is clear that then the temperature field is no longer rotation-ally averaged and the cross section of the crystal can differ from a circular one. The temperature field caused by the induction coil as well as the surface tension dominate the cross section of the crystal [11]. [Pg.50]

Such an inductor generates a temperature field of almost square symmetry. The main slit in the inductor, which forms the current loop, however, is not completely equivalent to the other three slits as seen in Fig. 3.9b. Furthermore, the surface tension surrounds the corners by minimizing the melt surface, which is not desired because the goal are quadratic wafers directly cut from the crystals. Additionally, on the straight sides, where the horizontal curvature is almost zero, growth instabilities can occur. Regarding the application for the solar industry, which would save material loss and the costs of cutting the round crystal into a square one, it is essential to get a stable [Pg.50]

Numerical modelling can support process development. Also for this application, calculations were made [12] to find out, whether a symmetric cross section is possible. [Pg.51]

Even with a rather simple inductor, the numerical calculation shows that it should be possible to form a useful crystal shape (Fig. 3.9). [Pg.51]


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