No abstract

A B S T R A C TRibbons of silicon were grown from a supercooled melt and examined by various techniques. From the morphology of the ribbons, dislocation patterns, twin structures, and microsegregation traces, it was shown that the basic growth sequence is similar to that given for germanium.Some differences are found, however, and these are described. Microsegregation traces were used to elucidate the growth sequence of degenerate ribbons.

The dynamics of ``web'' growth have been investigated, with particular emphasis on the meniscus. The meniscus deflections have been expressed as a function of surface tension, and pulling force. An effort is being made to describe the parameters which influence surface tension, and its reflection on the process of web growth, and the properties of the material. The degree of supercooling, crucible design, and the control of thermal gradients have profound effects on the quality of the crystal and its physical dimensions.