The role of accelerated crucible rotation in the growth of Hg1−xCdxTe and CdTe/CdZnTe

Capper, P.

doi:10.1016/0960-8974(94)90012-4

Cited by 52 publications

(30 citation statements)

References 119 publications

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“…The first period of each sequence is shown in Figure 3. Changes of the transport phenomena during the first half of one period are almost the same as those during the second half, except the spiral shearing flow, which has little effect on the axial or radial transfer of the solute [19]. Distributions of the convections and the concentration were very sensitive to the ACRT sequences, and regular periodic changes of the convections and the concentration could be quickly obtained just half a period after the ACRT began.…”

Section: Computational Strategymentioning

confidence: 59%

“…In this model, we employ the trapezoid-wave ACRT sequence, which includes acceleration stage, constant rotation stage, deceleration stage, and the stop stage in every half period. To determine the main parameters of the ACRT, i.e., the maximum rotation rate, the constant rotation time, and the stop time, we first obtained the probable value ranges according to the general theoretical study by Capper et al [16,19] on ACRT parameters, applied them to our numerical model on ZnTe growth, and made necessary modifications to ensure that the solution in front of the growth interface could be well mixed, and that the run and stop times were comparable to the duration of the Ekman flow.…”

Section: Computational Strategymentioning

confidence: 99%

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The Effects of ACRT on the Growth of ZnTe Crystal by the Temperature Gradient Solution Growth Technique

Yin

Wang

et al. 2017

Crystals

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Abstract:A finite element method is used here to simulate the temperature field, the thermosolutal convection, the solute segregation, and the non-isothermal phase transformation during the growth of ZnTe crystal via the temperature gradient solution growth technique (TGSG) with an accelerated crucible rotation technique (ACRT). Three different trapezoid-wave ACRT sequences are proposed, and their effects are examined from the views of the constitutional supercooling and the mixing of the solution. The solution in front of the growth interface can be fully mixed only during the constant rotation stage of the ACRT when there is a clockwise Ekman flow. An inappropriate ACRT can produce excessively strong clockwise and counterclockwise Ekman flows, and this results in constitutional supercooling in front of the central part of the growth interface at the beginning of the stop stage and in front of the peripheral part at the end of the constant rotation stage. By adjusting the acceleration rate of the ampoule rotation, the appropriate Ekman flows can be obtained to well mix the solution and avoid the constitutional supercooling. An appropriate ACRT sequence is provided, which can facilitate the mixing of the solution, avoid constitutional supercooling, and improve the growth interface morphology.

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Section: Computational Strategymentioning

confidence: 59%

Section: Computational Strategymentioning

confidence: 99%

The Effects of ACRT on the Growth of ZnTe Crystal by the Temperature Gradient Solution Growth Technique

Yin

Wang

et al. 2017

Crystals

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“…Although rapid progress has taken place in the epitaxial growth techniques for CMT, material grown by several bulk methods is still in use for infrared detection, particularly for photoconductive detectors. Several historical reviews of the development of bulk CMT have been published [3][4][5][6][7][8]. Micklethwaite [3] and Kruse [4] gave comprehensive information on the growth techniques used prior to 1980.…”

Section: Crystal Growthmentioning

confidence: 99%

“…They concluded that the electrical performance had only recently (at that time) been matched by LPE but pointed to the problems of structural defects and size limitations for use in second-generation infrared detectors. This chapter continues with reviews of the three basic bulk-growth techniques, mainly using the more recent reviews of Tregilgas [10], Triboulet [11] and Capper [7,8], although updates on developments in these basic techniques are also given, where applicable.…”

Section: Crystal Growthmentioning

confidence: 99%

Bulk Growth of Cadmium Mercury Telluride (CMT)

Capper¹

2010

Bulk Crystal Growth of Electronic, Optical &Amp; Optoelectronic Materials

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“…Lee et al [5] maintained a constant zinc content in the melt in the front of the interface by adjusting the temperature (800~840°C) of the (Cd, Te) alloy source to improve axial segregation. Furthermore, the low temperature gradient method [6], the horizontal Bridgman method [7], vibration and stirring [8], the high-pressure Bridgman method [9], and the accelerated crucible rotation technique [10] are used to decrease the solute zinc segregation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of control parameters of cadmium zinc telluride Bridgman single crystal growth

Liu

Song

Zhang

et al. 2007

Cryst. Res. Technol.

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The temperature gradient within a furnace chamber and the crucible pull rate are the key control parameters for cadmium zinc telluride Bridgman single crystal growth. Their effects on the heat and mass transfer in front of the solid-liquid interface and the solute segregation in the grown crystal were investigated with numerical modeling. With an increase of the temperature gradient, the convection intensity in the melt in front of the solid-liquid interface increases almost proportionally to the temperature gradient. The interface concavity decreases rapidly at faster crucible pull rates, while it increases at slow pull rates. Moreover, the solute concentration gradient in the melt in front of the solid-liquid interface decreases significantly, as does the radial solute segregation in the grown crystal. In general, a decrease of the pull rate leads to a strong decrease of the concavity of the solid-liquid interface and of the radial solute segregation in the grown crystal, while the axial solute segregation in the grown crystal increases slightly. A combination of a low crucible pull rate with a medium temperature gradient within the furnace chamber will make the radial solute segregation of the grown crystal vanish.

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The role of accelerated crucible rotation in the growth of Hg1−xCdxTe and CdTe/CdZnTe

Cited by 52 publications

References 119 publications

The Effects of ACRT on the Growth of ZnTe Crystal by the Temperature Gradient Solution Growth Technique

The Effects of ACRT on the Growth of ZnTe Crystal by the Temperature Gradient Solution Growth Technique

Bulk Growth of Cadmium Mercury Telluride (CMT)

Optimization of control parameters of cadmium zinc telluride Bridgman single crystal growth

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