The effects of ACRT on melt undercooling during the growth of CZT via the traveling heater method: Ekman versus Taylor-Görtler flows

Jeff H Peterson; Jeffrey J. Derby

doi:10.1016/j.jcrysgro.2021.126409

The effects of ACRT on melt undercooling during the growth of CZT via the traveling heater method: Ekman versus Taylor-Görtler flows

Jeff H Peterson, Jeffrey J. Derby

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

For the first time, a comprehensive model for the traveling heater method, including detailed species transport and phase-change thermodynamics, is applied to understand the effects of accelerated crucible rotation (ACRT) on the growth of cadmium zinc telluride. A rotation schedule that is designed from classical considerations does not completely mix the melt, rather undercooled regions of localized melt are swept periodically across the growth interface. Even without melt homogenization, these ACRT-driven flows disrupt the persistent undercooling that occurs during THM growth without rotation. An ACRT schedule designed to promote Ekman flows results in lower levels of melt undercooling than a schedule designed to promote Taylor-Görtler flows and greater mixing.

Original language	English (US)
Article number	126409
Journal	Journal of Crystal Growth
Volume	577
DOIs	https://doi.org/10.1016/j.jcrysgro.2021.126409
State	Published - Jan 1 2022

Bibliographical note

Funding Information:
This work was supported by the U.S. National Science Foundation NSF DMR-10007885, the content of which does not necessarily reflect the position or policy of the United States Government, and no official endorsement should be inferred. The authors would like to thank A. Yeckel, who developed and provided support for the Cats2D code at the University of Minnesota.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

A1. Computer simulation
A1. Fluid flows
A1. Morphological stability
A2. Accelerated crucible rotation technique
A2. Traveling heater method growth
B2. Semiconducting II-VI materials

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10.1016/j.jcrysgro.2021.126409

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title = "The effects of ACRT on melt undercooling during the growth of CZT via the traveling heater method: Ekman versus Taylor-G{\"o}rtler flows",

abstract = "For the first time, a comprehensive model for the traveling heater method, including detailed species transport and phase-change thermodynamics, is applied to understand the effects of accelerated crucible rotation (ACRT) on the growth of cadmium zinc telluride. A rotation schedule that is designed from classical considerations does not completely mix the melt, rather undercooled regions of localized melt are swept periodically across the growth interface. Even without melt homogenization, these ACRT-driven flows disrupt the persistent undercooling that occurs during THM growth without rotation. An ACRT schedule designed to promote Ekman flows results in lower levels of melt undercooling than a schedule designed to promote Taylor-G{\"o}rtler flows and greater mixing.",

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note = "Funding Information: This work was supported by the U.S. National Science Foundation NSF DMR-10007885, the content of which does not necessarily reflect the position or policy of the United States Government, and no official endorsement should be inferred. The authors would like to thank A. Yeckel, who developed and provided support for the Cats2D code at the University of Minnesota. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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doi = "10.1016/j.jcrysgro.2021.126409",

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T2 - Ekman versus Taylor-Görtler flows

AU - Peterson, Jeff H

AU - Derby, Jeffrey J.

N1 - Funding Information: This work was supported by the U.S. National Science Foundation NSF DMR-10007885, the content of which does not necessarily reflect the position or policy of the United States Government, and no official endorsement should be inferred. The authors would like to thank A. Yeckel, who developed and provided support for the Cats2D code at the University of Minnesota. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2022/1/1

Y1 - 2022/1/1

N2 - For the first time, a comprehensive model for the traveling heater method, including detailed species transport and phase-change thermodynamics, is applied to understand the effects of accelerated crucible rotation (ACRT) on the growth of cadmium zinc telluride. A rotation schedule that is designed from classical considerations does not completely mix the melt, rather undercooled regions of localized melt are swept periodically across the growth interface. Even without melt homogenization, these ACRT-driven flows disrupt the persistent undercooling that occurs during THM growth without rotation. An ACRT schedule designed to promote Ekman flows results in lower levels of melt undercooling than a schedule designed to promote Taylor-Görtler flows and greater mixing.

AB - For the first time, a comprehensive model for the traveling heater method, including detailed species transport and phase-change thermodynamics, is applied to understand the effects of accelerated crucible rotation (ACRT) on the growth of cadmium zinc telluride. A rotation schedule that is designed from classical considerations does not completely mix the melt, rather undercooled regions of localized melt are swept periodically across the growth interface. Even without melt homogenization, these ACRT-driven flows disrupt the persistent undercooling that occurs during THM growth without rotation. An ACRT schedule designed to promote Ekman flows results in lower levels of melt undercooling than a schedule designed to promote Taylor-Görtler flows and greater mixing.

KW - A1. Computer simulation

KW - A1. Fluid flows

KW - A1. Morphological stability

KW - A2. Accelerated crucible rotation technique

KW - A2. Traveling heater method growth

KW - B2. Semiconducting II-VI materials

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DO - 10.1016/j.jcrysgro.2021.126409

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ER -

The effects of ACRT on melt undercooling during the growth of CZT via the traveling heater method: Ekman versus Taylor-Görtler flows

Abstract

Bibliographical note

Keywords

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