Dewetting application to CdTe single crystal growth on earth

Chevalier, Nicolas; Dusserre, P; Garandet, J.P.; Duffar, T.

doi:10.1016/j.jcrysgro.2003.10.094

Cited by 23 publications

(34 citation statements)

References 4 publications

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“…We carry out detailed heat transfer computations for two configurations like those employed in prior experimental studies of the detached growth of germanium by Palosz et al [9] and cadmium telluride by Chevalier et al [5]. Our analyses reinforce the notion that favorable thermal conditions may prevent reattachment during detached growth.…”

Section: Introductionsupporting

confidence: 58%

“…The dewetting phenomenon was observed for the first time in microgravity experiments [1,2] then successfully reproduced in earth experiments [3][4][5][6][7][8][9][10]. The prevailing wisdom for conducting detached growth on earth is to establish a liquid meniscus between the crystal and the crucible wall and maintain it by controlling the pressure difference between the gas space above the melt and the gap.…”

Section: Introductionmentioning

confidence: 87%

“…We next consider an idealized vertical gradient freeze (VGF) configuration with three heaters, shown in Figure 6 and representative of that used for the detached growth of CdTe by Chevalier et al [5]. As in the prior model, the geometry is considered to be axisymmetric, and the system centerline is drawn on the left side of the schematic.…”

Section: Three-heater Vertical Gradient Freeze Furnacementioning

confidence: 99%

“…Chevalier et al [5] attained successful detached growth only for an optimized thermal field in the furnace. The CdTe charge, with dimensions 1.4 x 8 cm, was contained in a silica crucible contained by an outer silica ampoule.…”

Section: Three-heater Vertical Gradient Freeze Furnacementioning

confidence: 99%

“…The temperature inside the furnace was measured by using thermocouples placed in the space between the crucible and ampoule. According to Chevalier et al [5], the optimal set of temperatures measured in the experiment at the beginning of the growth process was T 1 = 1, 163 K, T 2 = 1, 188 K, and T 3 = 1, 373 K. This set of temperatures has been imposed at three control points (see Figure 6), and the power supplied in the furnaces has been computed by using inverse simulation.…”

Section: Three-heater Vertical Gradient Freeze Furnacementioning

confidence: 99%

See 4 more Smart Citations

On favorable thermal fields for detached Bridgman growth

Stelian

Volz

Derby

2009

Journal of Crystal Growth

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The thermal fields of two Bridgman-like configurations, representative of real systems used in prior experiments for the detached growth of CdTe and Ge crystals, are studied. These detailed heat transfer computations are performed using the CrysMAS code and expand upon our previous analyses [14] that posited a new mechanism involving the thermal field and meniscus position to explain stable conditions for dewetted Bridgman growth. Computational results indicate that heat transfer conditions that led to successful detached growth in both of these systems are in accordance with our prior assertion, namely that the prevention of crystal reattachment to the crucible wall requires the avoidance of any undercooling of the melt meniscus during the growth run. Significantly, relatively simple process modifications that promote favorable thermal conditions for detached growth may overcome detrimental factors associated with meniscus shape and crucible wetting. Thus, these ideas may be important to advance the practice of detached growth for many materials.

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Section: Introductionsupporting

confidence: 58%