Analysis of the accelerated crucible rotation technique applied to the gradient freeze growth of cadmium zinc telluride
- University of Minnesota, Minneapolis, MN (United States)
Here we employ finite-element modeling to assess the effects of the accelerated crucible rotation technique (ACRT) on cadmium zinc telluride (CZT) crystals grown from a gradient freeze system. Via consideration of tellurium segregation and transport, we show, for the first time, that steady growth from a tellurium-rich melt produces persistent undercooling in front of the growth interface, likely leading to morphological instability. The application of ACRT rearranges melt flows and tellurium transport but, in contrast to conventional wisdom, does not altogether eliminate undercooling of the melt. Rather, a much more complicated picture arises, where spatio-temporal realignment of undercooled melt may act to locally suppress instability. A better understanding of these mechanisms and quantification of their overall effects will allow for future growth optimization.
- Research Organization:
- Washington State Univ., Pullman, WA (United States); Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); Washington State University
- Grant/Contract Number:
- NA0002565; 118717-G003369
- OSTI ID:
- 1533971
- Alternate ID(s):
- OSTI ID: 1396409
- Journal Information:
- Journal of Crystal Growth, Vol. 468, Issue C; ISSN 0022-0248
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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