Development of model-based control for Bridgman crystal growth

Computer simulations are performed to assess the feasibility of a submerged heater system for growth of cadmium zinc telluride (CZT). Adding a submerged heater to the vertical Bridgman configuration in the manner of the submerged heater method (SHM) and axial-heat-flux-close-to-the-phase-interface (AHP) systems allows superior control of the growth interface shape and significant reduction in thermal stress. Simulations demonstrate that maintaining a constant gap width between heater and growth interface is critical to achieving uniform axial segregation when using zone leveling. Radial segregation remains somewhat nonuniform, however, because of the poor mixing in the interface region.

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“…We also desire to apply the model-based control ideas presented in Ref. 48 to achieve optimal outcomes.…”

Section: Discussionmentioning

confidence: 99%

Feasibility study of cadmium zinc telluride growth using a submerged heater in a vertical bridgman system

Yeckel

Derby

2004

Journal of Elec Materi

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“…In Refs [157,158] Sonda, Yeckel, and Derby present a model-based approach for controlling the melt flow. In their system, the meridional melt speed S is used as the controlled variable.…”

Section: Flow Speed Controlmentioning

confidence: 99%

Automation of Crystal Growth from Melt

Winkler

Neubert

2015

Handbook of Crystal Growth

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“…The end result is that typical yields of useable material from a crystalline boule remain at 10% or lower, resulting in very high materials costs. Our modeling efforts have been directed to better understand the difficulties of CZT growth and suggest improvements [66][67][68][69][70][71][72][73][74][75][76][77][78].…”

Section: Examples Of Numerical Modeling: Growth Of Cztmentioning

confidence: 99%

Modeling and bulk crystal growth processes: What is to be learned?

Derby¹,

Wang²,

Tsukamoto³

et al. 2010

AIP Conference Proceedings

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Modeling is an important tool to better understand crystal growth. This assertion is discussed via examples of classical models that have proven to be enlightening. The discussion continues with a brief primer on the mathematical governing equations of continuum and interfacial phenomena important in crystal growth processes and several techniques that can be applied to these equations for analysis, including scaling and numerical methods. Finally, some examples of modeling a melt growth system are presented to illustrate modern applications.

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Development of model-based control for Bridgman crystal growth

Cited by 10 publications

References 17 publications

Feasibility study of cadmium zinc telluride growth using a submerged heater in a vertical bridgman system

Feasibility study of cadmium zinc telluride growth using a submerged heater in a vertical bridgman system

Automation of Crystal Growth from Melt

Modeling and bulk crystal growth processes: What is to be learned?

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