Detached crystal growth from melt by the axial heat processing technique

Balikci, Ercan; Deal, Andrew; Abbaschian, R.

doi:10.1016/j.jcrysgro.2004.07.062

Cited by 11 publications

(17 citation statements)

References 40 publications

(119 reference statements)

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“…Detached growth on earth, however, is more difficult to achieve because the hydrostatic pressure of the melt counteracts the effect of detachment. Unless detachment arises from oxide formation as reported recently for the growth in a pressure-balanced environment [9], an adequate overpressure in the gap below the meniscus is necessary to balance the hydrostatic pressure during growth. Several techniques to establish this gap pressure have been proposed.…”

Section: Introductionmentioning

confidence: 84%

“…In the last decade, the contactless or detached variant of the well-known vertical Bridgman/ vertical gradient freeze (VB/VGF) method has attracted considerable interest [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. It has been recognised as a promising technique to optimise the crystal quality and the growth yield because it combines a nominally crucible-based process with the features of the growth without wall contact.…”

Section: Introductionmentioning

confidence: 99%

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Detached growth behaviour of 2-in germanium crystals

Pätzold

Jenkner

Scholz

et al. 2005

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Detached growth behaviour of 2-in germanium crystals

Pätzold

Jenkner

Scholz

et al. 2005

Journal of Crystal Growth

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“…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%

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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“…When growth was completed, the furnace was allowed to slowly cool to room temperature and the crystal was removed from the crucible. Note that all of the crystals presented in this study grew detached from the crucible, as discussed elsewhere, [36] and were easily removable.…”

Section: Ahp Experimentsmentioning

confidence: 70%

Enhanced Morphological Stability in Sb-Doped Ge

Deal

Balikci

Abbaschian

2007

Metall Mater Trans A

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The axial heat processing (AHP) crystal growth technique was used to investigate the morphological stability of faceted solid/liquid (s/l) interfaces. Six Sb-doped Ge single crystals containing 2.3 · 10 )2 to 2.3 · 10 )1 at. pct Sb were grown at pulling rates of 10 to 20 mm/h. These include two bicrystals specifically designed to investigate the effect of slight misorientation on stability. Faceted growth with a kinetic supercooling on the order of 0.15 K was achieved, and a characteristic two-dimensional W instability boundary, an inverted crater in three dimensions, was observed. The crystals exhibited enhanced morphological stability over the predictions of the constitutional supercooling (CS) criterion and the Mullins and Sekerka (MS) stability criterion, with the highest stability in the center of the W. These results are examined with current analytical stability theories accounting for convection and kinetics. An alternate model is proposed based on anisotropic kinetics and the competition between lateral spreading on a faceted interface and the amplification rate of an interfacial perturbation.

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Detached crystal growth from melt by the axial heat processing technique

Cited by 11 publications

References 40 publications

Detached growth behaviour of 2-in germanium crystals

Detached growth behaviour of 2-in germanium crystals

On favorable thermal fields for detached Bridgman growth

Enhanced Morphological Stability in Sb-Doped Ge

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