Interfaces and flow regimes in ACRT grown CdxHg1−xTe crystals

Effects of accelerated crucible rotation on segregation and interface morphology for vertical Bridgman crystal growth: Visualization and simulation

“…Since both the thermal and solutal gradients in Eq. (1) are greatly affected by convection, ACRT has been shown effective in the control of the morphological stability as well [2,3]. To investigate the effect of ACRT on the morphological instability, a transparent growth system should be useful in that respect.…”

“…Because of a lack of control over the stirring condition, the introduction of forced convection by external forces for obtaining a favorable growth condition is often necessary. The accelerated crucible rotation technique (ACRT) proposed by Scheel and Schulz-DuBois [1] has been a useful means because of its simplicity and versatility [2,3]. By controlling the acceleration cycle patterns and the interactions with the buoyancy-driven convection, one could control the melt mixing at either an enhanced mixing or diffusion-limited mode [3][4][5][6].…”

Flow and segregation control by accelerated rotation for vertical Bridgman growth of cadmium zinc telluride: ACRT versus vibration

“…Scheel and Schulz-DuBois proposed an accelerated crucible rotation technique (ACRT) to control the melt mixing [1]. By controlling the acceleration cycle, it is possible to control the melt mixing at either an enhanced mixing [2][3][4] or diffusion-limited mode [5]. The effects of ACRT also depend on the ratio of the melt depth to the size of Ekman cells, on the buoyancy convection, and on the vortices that sometimes form due to the Taylor-Go¨rtler instability near the ampoule wall [6][7][8] ACRT is believed to be useful for the vertical Bridgman growth of cadmium zinc telluride (ZnCdTe), and has attracted extensive discussion recently [7][8][9][10].…”

Simulating Interface Growth and Defect Generation in CZT – Simulation State of the Art and Known Gaps

“…Accelerated crucible rotation technique (ACRT) [16,17,[77][78][79][80] has been used in crystal growth for many years; the purpose of acceleration being to maximize convective flow by generating Ekman boundary layers at solid surfaces [81]. A series of experimental studies of ACRT has been conducted by Caper and coworkers [77][78][79][80], and they observed Ekman flow and a sidewall instability, which is identified as a Couette instability.…”

“…A series of experimental studies of ACRT has been conducted by Caper and coworkers [77][78][79][80], and they observed Ekman flow and a sidewall instability, which is identified as a Couette instability. A. Yeckel and J. J. Derby [54] used continuum crystal growth models to numerically simulated the ACRT applied to the vertical solidification system, and sidewall instability was shown in their results and identified as a Taylor-Görtler boundary layer instability [82].…”