Buoyant and Rotational Flows During ACRT Vertical Bridgman Crystal Growth

Mapping Intimacies ◽

10.1115/imece2000-2071 ◽

2000 ◽

Author(s):

Jeffrey J. Derby ◽

Andrew Yeckel

Keyword(s):

Crystal Growth ◽

Large Diameter ◽

Growth Dynamics ◽

Liquid Interface ◽

Melt Mixing ◽

Rotational Flows ◽

Vertical Bridgman ◽

Solid Liquid Interface ◽

Crucible Rotation ◽

Solid Liquid

Abstract Axisymmetric, time-dependent simulations of the high-pressure vertical Bridgman growth of large-diameter cadmium zinc telluride are performed to study the effect of accelerated crucible rotation (ACRT) on crystal growth dynamics. The model includes details of heat transfer, melt convection, solid-liquid interface shape, and dilute zinc segregation. Application of ACRT greatly improves mixing in the melt, but causes an overall increased deflection of the solid-liquid interface. The flow exhibits a Taylor-Görtler instability at the crucible sidewall, which further enhances melt mixing.

Download Full-text

The Numerical Analyses of the Solid-Liquid Interface Shape during Crystal Growth by the Czochralski Method. Part II. Effects of the Crucible Rotation

Japanese Journal of Applied Physics ◽

10.1143/jjap.9.1255 ◽

1970 ◽

Vol 9 (10) ◽

pp. 1255-1259 ◽

Cited By ~ 28

Author(s):

Nobuyuki Kobayashi ◽

Tetsuya Arizumi

Keyword(s):

Crystal Growth ◽

Czochralski Method ◽

Liquid Interface ◽

Numerical Analyses ◽

Interface Shape ◽

Solid Liquid Interface ◽

Crucible Rotation ◽

Solid Liquid

Download Full-text

Numerical Analysis of Difficulties of Growing Large-Size Bulk β-Ga2O3 Single Crystals with the Czochralski Method

Crystals ◽

10.3390/cryst11010025 ◽

2020 ◽

Vol 11 (1) ◽

pp. 25

Author(s):

Xia Tang ◽

Botao Liu ◽

Yue Yu ◽

Sheng Liu ◽

Bing Gao

Keyword(s):

Crystal Growth ◽

Single Crystals ◽

Czochralski Method ◽

Liquid Interface ◽

Spiral Growth ◽

Growth Time ◽

Large Size ◽

Crystal Diameter ◽

Solid Liquid Interface ◽

Solid Liquid

The difficulties in growing large-size bulk β-Ga2O3 single crystals with the Czochralski method were numerically analyzed. The flow and temperature fields for crystals that were four and six inches in diameter were studied. When the crystal diameter is large and the crucible space becomes small, the flow field near the crystal edge becomes poorly controlled, which results in an unreasonable temperature field, which makes the interface velocity very sensitive to the phase boundary shape. The effect of seed rotation with increasing crystal diameter was also studied. With the increase in crystal diameter, the effect of seed rotation causes more uneven temperature distribution. The difficulty of growing large-size bulk β-Ga2O3 single crystals with the Czochralski method is caused by spiral growth. By using dynamic mesh technology to update the crystal growth interface, the calculation results show that the solid–liquid interface of the four-inch crystal is slightly convex and the center is slightly concave. With the increase of crystal growth time, the symmetry of cylindrical crystal will be broken, which will lead to spiral growth. The numerical results of the six-inch crystal show that the whole solid–liquid interface is concave and unstable, which is not conducive to crystal growth.

Download Full-text