Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors
Abstract
II–IV–V2 materials, ternary analogs to III–V materials, are emerging for their potential applications in devices such as LEDs and solar cells. Controlling cation ordering in II–IV–V2 materials offers the potential to tune properties at nearly fixed compositions and lattice parameters. While tuning properties at a fixed lattice constant through ordering has the potential to be a powerful tool used in device fabrication, cation ordering also creates challenges with characterization and quantification of ordering. In this work, we investigate two different methods to quantify cation ordering in ZnGeP2 thin films: a stretching parameter calculated from lattice constants , and an order parameter determined from the cation site occupancies (S). We use high resolution X-ray diffraction (HRXRD) to determine and resonant energy X-ray diffraction (REXD) to extract S. REXD is critical to distinguish between elements with similar Z-number (e.g. Zn and Ge). We found that samples with a corresponding to the ordered chalcopyrite structure had only partially ordered S values. The optical absorption onset for these films occurred at lower energy than expected for fully ordered ZnGeP2, indicating that S is a more accurate descriptor of cation order than the stretching parameter. Since disorder is complex and can occur on many lengthmore »
- Authors:
-
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Colorado School of Mines, Golden, CO (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1633721
- Alternate Identifier(s):
- OSTI ID: 1604243; OSTI ID: 1606128
- Report Number(s):
- NREL/JA-5K00-75485
Journal ID: ISSN 2050-7526; JMCCCX; TRN: US2201223
- Grant/Contract Number:
- AC02-76SF00515; 1646713; DGE-114747; 1729594; AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry C
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 13; Journal ID: ISSN 2050-7526
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; cation ordering; thin films; semiconductors
Citation Formats
Schnepf, Rekha R., Levy-Wendt, Ben L., Tellekamp, M. Brooks, Ortiz, Brenden R., Melamed, Celeste L., Schelhas, Laura T., Stone, Kevin H., Toney, Michael F., Toberer, Eric S., and Tamboli, Adele C. Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors. United States: N. p., 2020.
Web. doi:10.1039/c9tc06699c.
Schnepf, Rekha R., Levy-Wendt, Ben L., Tellekamp, M. Brooks, Ortiz, Brenden R., Melamed, Celeste L., Schelhas, Laura T., Stone, Kevin H., Toney, Michael F., Toberer, Eric S., & Tamboli, Adele C. Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors. United States. https://doi.org/10.1039/c9tc06699c
Schnepf, Rekha R., Levy-Wendt, Ben L., Tellekamp, M. Brooks, Ortiz, Brenden R., Melamed, Celeste L., Schelhas, Laura T., Stone, Kevin H., Toney, Michael F., Toberer, Eric S., and Tamboli, Adele C. Thu .
"Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors". United States. https://doi.org/10.1039/c9tc06699c. https://www.osti.gov/servlets/purl/1633721.
@article{osti_1633721,
title = {Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors},
author = {Schnepf, Rekha R. and Levy-Wendt, Ben L. and Tellekamp, M. Brooks and Ortiz, Brenden R. and Melamed, Celeste L. and Schelhas, Laura T. and Stone, Kevin H. and Toney, Michael F. and Toberer, Eric S. and Tamboli, Adele C.},
abstractNote = {II–IV–V2 materials, ternary analogs to III–V materials, are emerging for their potential applications in devices such as LEDs and solar cells. Controlling cation ordering in II–IV–V2 materials offers the potential to tune properties at nearly fixed compositions and lattice parameters. While tuning properties at a fixed lattice constant through ordering has the potential to be a powerful tool used in device fabrication, cation ordering also creates challenges with characterization and quantification of ordering. In this work, we investigate two different methods to quantify cation ordering in ZnGeP2 thin films: a stretching parameter calculated from lattice constants , and an order parameter determined from the cation site occupancies (S). We use high resolution X-ray diffraction (HRXRD) to determine and resonant energy X-ray diffraction (REXD) to extract S. REXD is critical to distinguish between elements with similar Z-number (e.g. Zn and Ge). We found that samples with a corresponding to the ordered chalcopyrite structure had only partially ordered S values. The optical absorption onset for these films occurred at lower energy than expected for fully ordered ZnGeP2, indicating that S is a more accurate descriptor of cation order than the stretching parameter. Since disorder is complex and can occur on many length scales, metrics for quantifying disorder should be chosen that most accurately reflect the physical properties of interest.},
doi = {10.1039/c9tc06699c},
journal = {Journal of Materials Chemistry C},
number = 13,
volume = 8,
place = {United States},
year = {Thu Mar 12 00:00:00 EDT 2020},
month = {Thu Mar 12 00:00:00 EDT 2020}
}
Web of Science
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