| Control Of Phase Transition Interface Shape Of Cadmium Zinc Telluride In An Electrodynamic Gradient Furnace | ||
| Lisa Lun1, Andrew Yeckel2, Jeffrey J. Derby3 and Prodromos Daoutidis1, (1)Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, Minneapolis, MN 55455, (2)Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, Minneapolis, MN 55455-0132, (3)Chemical Eningeering and Materials Science, University of Minnesota, 151 Amundson Hall, Minneapolis, MN 55455-0132 We consider the feasibility of closed-loop control to control the interface shape of cadmium zinc telluride (CZT) grown via an electrodynamic gradient (EDG) furnace developed by eV Products, Inc. The model employed is based on a self-consistent, multi-scale simulation of the EDG system that includes both the furnace and the growing crystal. A simple proportional control algorithm is applied to a quasi-steady-state model to control the interface shape by adjusting the thermal gradient of the furnace temperatures. Three scenarios are enacted: actuation along the entire external boundary, along the solid portion only, and along the melt portion only. Actuation along the solid portion proved to be the most successful of the three scenarios, as predicted by our open-loop calculations. Furthermore, with this control scenario, we were able to produce the unexpected benefit of a favorable interface shape that is convex toward the melt. Extended Abstract Status: Not Uploaded | ||