Analysis of the accelerated crucible rotation technique applied to the gradient freeze growth of cadmium zinc telluride

Mia S. Divecha, Jeffrey J. Derby

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)630-634
Number of pages5
JournalJournal of Crystal Growth
Volume468
DOIs
StatePublished - Jun 15 2017

Keywords

  • A1. Computer simulation
  • A1. Convection
  • A1. Crystal morphology
  • A1. Heat transfer
  • A1. Mass transfer
  • B1. Semiconducting II-VI materials

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