TY - JOUR
T1 - Analysis of the accelerated crucible rotation technique applied to the gradient freeze growth of cadmium zinc telluride
AU - Divecha, Mia S.
AU - Derby, Jeffrey J.
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/6/15
Y1 - 2017/6/15
N2 - 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.
AB - 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.
KW - A1. Computer simulation
KW - A1. Convection
KW - A1. Crystal morphology
KW - A1. Heat transfer
KW - A1. Mass transfer
KW - B1. Semiconducting II-VI materials
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U2 - 10.1016/j.jcrysgro.2016.09.068
DO - 10.1016/j.jcrysgro.2016.09.068
M3 - Article
AN - SCOPUS:84995380636
SN - 0022-0248
VL - 468
SP - 630
EP - 634
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -