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Proceedings Paper

Producibility improvements suggested by a validated process model of seeded CdZnTe vertical Bridgman growth
Author(s): David J. Larson Jr.; Louis G. Casagrande; Don Di Marzio; Alan Levy; Frederick M. Carlson; Taipao Lee; David R. Black; Jun Wu; Michael Dudley
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Paper Abstract

We have successfully validated theoretical models of seeded vertical Bridgman-Stockbarger CdZnTe crystal growth and post-solidification processing, using in-situ thermal monitoring and innovative material characterization techniques. The models predict the thermal gradients, interface shape, fluid flow and solute redistribution during solidification, as well as the distributions of accumulated excess stress that causes defect generation and redistribution. Data from the furnace and ampoule wall have validated predictions from the thermal model. Results are compared to predictions of the thermal and thermo-solutal models. We explain the measured initial, change-of-rate, and terminal compositional transients as well as the macrosegregation. Macro and micro-defect distributions have been imaged on CdZnTe wafers from 40 mm diameter boules. Superposition of topographic defect images and predicted excess stress patterns suggests the origin of some frequently encountered defects, particularly on a macro scale, to result from the applied and accumulated stress fields and the anisotropic nature of the CdZnTe crystal. Implications of these findings with respect to producibility are discussed.

Paper Details

Date Published: 13 July 1994
PDF: 10 pages
Proc. SPIE 2228, Producibility of II-VI Materials and Devices, (13 July 1994); doi: 10.1117/12.179670
Show Author Affiliations
David J. Larson Jr., Grumman Corporate Research Ctr. (United States)
Louis G. Casagrande, Grumman Corporate Research Ctr. (United States)
Don Di Marzio, Grumman Corporate Research Ctr. (United States)
Alan Levy, Grumman Corporate Research Ctr. (United States)
Frederick M. Carlson, Clarkson Univ. (United States)
Taipao Lee, Clarkson Univ. (United States)
David R. Black, National Institute of Standards and Technology (United States)
Jun Wu, SUNY/Stony Brook (United States)
Michael Dudley, SUNY/Stony Brook (United States)

Published in SPIE Proceedings Vol. 2228:
Producibility of II-VI Materials and Devices
Herbert K. Pollehn; Raymond S. Balcerak, Editor(s)

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