Segregation and interface shape control during EDG growth of CZT crystals

Jeffrey J. Derby; Nan Zhang; Andrew Yeckel

doi:10.1117/12.896542

27 September 2011 Segregation and interface shape control during EDG growth of CZT crystals

Jeffrey J. Derby, Nan Zhang, Andrew Yeckel

Proceedings Volume 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII; 814216 (2011) https://doi.org/10.1117/12.896542
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

Jeffrey J. Derby, Nan Zhang, and Andrew Yeckel "Segregation and interface shape control during EDG growth of CZT crystals", Proc. SPIE 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII, 814216 (27 September 2011); https://doi.org/10.1117/12.896542

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