A novel, bell-curve furnace temperature profile is presented and predicted to achieve macroscopically convex solid-liquid interface shapes during melt growth of CZT in an EDG furnace. A strategy is also presented to dynamically adapt this furnace profile so that uniform, convex interface shapes are maintained through an entire growth run. This approach represents a significant advance over traditional gradient-freeze profiles, which always yield concave interface shapes, and static heat transfer designs, such as pedestal design, that achieve convex interfaces over only a small portion of the growth run. Importantly, this strategy may be applied to any Bridgman configuration that utilizes multiple, controllable heating zones. Realizing a convex solidification interface via this adaptive bell-curve furnace profile is postulated to result in better crystallinity and higher yields than conventional CZT growth techniques.
Bibliographical noteFunding Information:
This work was conducted at the University of Minnesota and supported in part by the Department of Energy, National Nuclear Security Administration , under Award DE-FG52-08NA28768 . The content of the work does not necessarily reflect the position or policy of the United States Government, and no official endorsement should be inferred. Computational resources were provided by the Minnesota Supercomputer Institute.
- A1. Computer simulation
- A1. Convection
- A1. Heat transfer
- A1. Segregation
- A2. Bridgman technique
- B2. Semiconducting II-VI materials