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The effect of an improved density functional on the thermodynamics and adsorption-controlled growth windows of chalcogenide perovskites

Published online by Cambridge University Press:  26 June 2018

Stephen A. Filippone ,
Yi-Yang Sun  and
R. Jaramillo
Stephen A. Filippone
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
Yi-Yang Sun
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
R. Jaramillo*
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
*
*(Email: rjaramil@mit.edu)
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Abstract

Ternary sulfides and selenides in the distorted-perovskite structure (“chalcogenide perovskites”) are predicted by theory to be semiconductors with band gap in the visible-to-infrared and may be useful for optical, electronic, and energy conversion technologies. Density functional theory can be used in combination with computational thermodynamics to predict the pressure-temperature phase diagrams for chalcogenide perovskites. We report results using the Strongly Constrained and Appropriately Normed (SCAN) and the rVV10 density functionals, and compare to previously-published results using the PBEsol functional. We highlight the windows of thermodynamic equilibrium between solid chalcogenide perovskites and the vapor phase at high temperature and very low pressure. These phase diagrams can guide adsorption-limited growth of ternary chalcogenides by molecular beam epitaxy (MBE).

Keywords

thermodynamicsmolecular beam epitaxy (MBE)perovskitesphysical vapor deposition (PVD)phase equilibria
Type
Articles
Information
MRS Advances , Volume 3 , Issue 55: Energy Materials and Technologies , 2018 , pp. 3249 - 3254
Copyright
Copyright © Materials Research Society 2018 

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