Explanation

It is a method for preparing single crystal by lifting seed crystal from melt in a vertical direction. The specific process is as follows: the raw material is melted in a crucible, the temperature is stabilized, the seed crystal is immersed in the melt, and the process of pulling a single crystal ingot is completed through the steps of crystal introduction, shoulder placing, shoulder turning, equal diameter, tail off, etc. Advantages: the whole process of crystal growth can be directly observed, which is convenient to control the growth conditions; The crystal does not contact the crucible wall, and there is no parasitic nucleation of the crucible wall; The "necking" technology of seed crystal can reduce or even eliminate dislocation, and obtain single crystal with few dislocation or even no dislocation; High quality single crystal can be obtained at a faster speed.

Classification