Segregation and interface shape control during EDG growth of CZT crystals

Jeffrey J Derby, Nan Zhang, Andrew Yeckel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Computational models are applied to analyze the segregation of zinc and the shape of the solid-liquid interface during the growth of Cadmium Zinc Telluride (CZT) via an electrodynamic gradient freeze (EDG) process. Validation of the computational model is presented via a comparison between predicted and experimentally measured zinc distributions. Analysis of a large-scale CZT EDG growth system, previously analyzed by Gasperino et al. (JCG 311, 2327-2335, 2009), shows anomalous zinc segregation that features anomalous, non-monotonic axial concentrations and several local minima and maxima radially across the boule. A mechanistic explanation is put forth for this effect based on the evolution of multi-cellular melt flow structures, a particularly common feature of CZT growth. Optimized EDG furnace profiles are presented that promote the growth of CZT crystals with a uniformly convex interface shape. Such interface shapes are expected to improve the single-crystalline yield of this material.

Original languageEnglish (US)
Title of host publicationHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII
DOIs
StatePublished - Nov 2 2011
EventHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII - San Diego, CA, United States
Duration: Aug 22 2011Aug 24 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8142
ISSN (Print)0277-786X

Conference

ConferenceHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII
CountryUnited States
CitySan Diego, CA
Period8/22/118/24/11

Keywords

  • CZT
  • Crystal growth
  • computational modeling
  • furnace thermal profile
  • interface shape
  • zinc segregation

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