Experimental study on the effect of crystal and crucible rotations on the thermal and velocity field in a low Prandtl number melt in a large crucible

3-D time-dependent numerical model of flow patterns within a large-scale Czochralski system

“…In addition, an experimental system with an 800 mm diameter crucible was developed to verify the results of the numerical model. Wood's metal was used for the melt in the experimental system [7,8]. The size of the crystal and the crucible diameter are 300 and 800 mm, respectively.…”

“…In order to overcome this obstacle, other groups have attempted using melts with low melting temperatures and a similar Pr number to silicon melt. Gorbunov et al [4] presented the temperature field using InGaSn (Tm ¼ 10.5 1C, Dc ¼ 500 mm, Pr ¼ 0.015-0.025), Lee and Chun [5,6] measured oscillatory convection using mercury (Tm=13$À8 1C, Dc= 160 mm, Pr=0.025) and Son et al [7,8] reported the effect of crystal and crucible rotation and thermal fluctuation using Wood's metal (Tm=70 1C, Dc=800 mm, Pr=0.019).…”

Instability of forced flow in a rotating cylindrical pool with a differentially rotating disk on the free surface

“…The unstable flow resembles baroclinic instability [24]. For both rotation of the crystal and the crucible, Son et al [25,26] found that the azimuthal velocity of the oscillatory wave decreased when the crystal counterrotated with crucible. Furthermore, as the crucible rotation rate increases, the time for the transition decreases and the maximum thermal fluctuation region migrates toward the crucible sidewall.…”

The effect of crystal rotation direction on the thermal and velocity fields of a Czochralski system with a low Prandtl number melt

“…The calibration equipment is annular in shape, with a 200 mm diameter. The coefficient between voltage and velocity is determined by 2:2 mV=ðcm=sÞ [11].…”

“…In our study, physical modeling of the Cz system using Wood's metal, which has a Pr number similar to that of silicon melt, in order to measure the thermal and velocity fields in Cz melt. The velocity field was measured empirically in a large crucible, and we reported that crystal rotation is the dominant factor influencing thermal fluctuation on the crystal-melt interface [11,12]. In general, crystal rotation during Cz growth is mainly used to provide a symmetric temperature profile, to suppress an angular variation of impurities, and to control the crystal-melt interface shape.…”