Journal article
Anomalous segregation during electrodynamic gradient freeze growth of cadmium zinc telluride
Journal of crystal growth, Vol.325(1), pp.10-19
2011
Handle:
https://hdl.handle.net/2376/117200
Abstract
A transient, coupled model has been developed to analyze the segregation of zinc in cadmium zinc telluride (CZT) grown in an electrodynamic gradient freeze (EDG) furnace. The coupled model consists of a local model that solves for time-dependent melt flow, heat transfer, melt–crystal interface position, and zinc distribution in both melt and solid phases and a quasi-steady-state global model that features realistic furnace heat transfer. After verification and validation tests, the model is applied to predict composition patterns in a large-scale CZT EDG growth system previously analyzed by Gasperino et al. [On crucible effects during the growth of cadmium zinc telluride in an electrodynamic gradient freeze furnace, J. Crys. Growth 311 (2009) 2327–2335]. Surprisingly, anomalous zinc segregation is predicted, featuring a non-monotonic axial concentration profile and several local minima and maxima across the boule. A mechanistic explanation is put forth based on the cumulative effect of changes in multi-cellular melt flow structures, a particularly susceptible occurrence for CZT systems. Additional effects of furnace translation rate and solid state diffusion are probed.
► A realistic, one-way coupling model has been developed to analyze segregation. ► Model verification and validation were demonstrated. ► Surprising, non-classical zinc segregation is predicted for EDG growth.
Metrics
6 Record Views
Details
- Title
- Anomalous segregation during electrodynamic gradient freeze growth of cadmium zinc telluride
- Creators
- Nan Zhang - Department of Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, 421 Washington Avenue SE, Minneapolis, MN 55455-0132, USAAndrew Yeckel - Department of Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, 421 Washington Avenue SE, Minneapolis, MN 55455-0132, USAArnold Burger - Department of Life and Physical Sciences, Center for Physics and Chemistry of Materials, Fisk University, 1000 17th Ave. N., Nashville, TN 37208-3051, USAYunlong Cui - Department of Life and Physical Sciences, Center for Physics and Chemistry of Materials, Fisk University, 1000 17th Ave. N., Nashville, TN 37208-3051, USAKelvin G Lynn - School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USAJeffrey J Derby - Department of Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, 421 Washington Avenue SE, Minneapolis, MN 55455-0132, USA
- Publication Details
- Journal of crystal growth, Vol.325(1), pp.10-19
- Publisher
- Elsevier B.V
- Identifiers
- 99900548175901842
- Language
- English
- Resource Type
- Journal article