Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires
Abstract
Zinc oxide (ZnO) nanowires are widely studied for use in ultraviolet optoelectronic devices, such as nanolasers and sensors. Nanowires (NWs) with an MgO shell exhibit enhanced band-edge photoluminescence (PL), a result previously attributed to passivation of ZnO defects. However, we find that processing the ZnO NWs under low oxygen partial pressure leads to an MgO-thickness-dependent PL enhancement owing to the formation of optical cavity modes. Conversely, processing under higher oxygen partial pressure leads to NWs that support neither mode formation nor band-edge PL enhancement. High-resolution electron microscopy and density-functional calculations implicate the ZnO m-plane surface morphology as the key determinant of core-shell structure and cavity-mode optics. A ZnO surface with atomic steps along the m-plane in the c-axis direction stimulates the growth of a smooth MgO shell that supports guided-wave optical modes and enhanced UV PL. On the other hand, a smoother ZnO surface leads to nucleation of a rough cladding layer which supports neither enhanced UV PL nor optical cavity modes. Finite-element analysis shows a clear correlation between allowed Fabry-Perot and whispering gallery modes and enhanced UV-PL. Finally, these results point the way to fabricating ZnO/MgO core-shell nanowires for more efficient UV nanolasers, scintillators, and sensors.
- Authors:
-
- Vanderbilt Univ., Nashville, TN (United States)
- Vanderbilt Univ., Nashville, TN (United States); Univ. of Memphis, TN (United States)
- Austin Peay State Univ., Clarksville, TN (United States)
- Stony Brook Univ., NY (United States)
- Vanderbilt Univ., Nashville, TN (United States); Austin Peay State Univ., Clarksville, TN (United States)
- Fisk Univ., Nashville, TN (United States); Tennessee State Univ., Nashville, TN (United States)
- Publication Date:
- Research Org.:
- Vanderbilt Univ., Nashville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1597869
- Alternate Identifier(s):
- OSTI ID: 1423703
- Grant/Contract Number:
- FG02-09ER46554; FG02-01ER45916; ACI-1053572; PHY-1263045; EPS-1004083; ACI-1053575; HRD-0420516
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ChemNanoMat
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2199-692X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; density functional calculations; zinc oxide; nanostructures; nanowires; photolumminescence
Citation Formats
Marvinney, Claire E., Shen, Xiao, McBride, James R., Critchlow, Dominic, Li, Zhineng, Mayo, Daniel C., Mu, Richard R., Pantelides, Sokrates T., and Haglund, Richard F. Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires. United States: N. p., 2018.
Web. doi:10.1002/cnma.201700313.
Marvinney, Claire E., Shen, Xiao, McBride, James R., Critchlow, Dominic, Li, Zhineng, Mayo, Daniel C., Mu, Richard R., Pantelides, Sokrates T., & Haglund, Richard F. Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires. United States. https://doi.org/10.1002/cnma.201700313
Marvinney, Claire E., Shen, Xiao, McBride, James R., Critchlow, Dominic, Li, Zhineng, Mayo, Daniel C., Mu, Richard R., Pantelides, Sokrates T., and Haglund, Richard F. Fri .
"Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires". United States. https://doi.org/10.1002/cnma.201700313. https://www.osti.gov/servlets/purl/1597869.
@article{osti_1597869,
title = {Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires},
author = {Marvinney, Claire E. and Shen, Xiao and McBride, James R. and Critchlow, Dominic and Li, Zhineng and Mayo, Daniel C. and Mu, Richard R. and Pantelides, Sokrates T. and Haglund, Richard F.},
abstractNote = {Zinc oxide (ZnO) nanowires are widely studied for use in ultraviolet optoelectronic devices, such as nanolasers and sensors. Nanowires (NWs) with an MgO shell exhibit enhanced band-edge photoluminescence (PL), a result previously attributed to passivation of ZnO defects. However, we find that processing the ZnO NWs under low oxygen partial pressure leads to an MgO-thickness-dependent PL enhancement owing to the formation of optical cavity modes. Conversely, processing under higher oxygen partial pressure leads to NWs that support neither mode formation nor band-edge PL enhancement. High-resolution electron microscopy and density-functional calculations implicate the ZnO m-plane surface morphology as the key determinant of core-shell structure and cavity-mode optics. A ZnO surface with atomic steps along the m-plane in the c-axis direction stimulates the growth of a smooth MgO shell that supports guided-wave optical modes and enhanced UV PL. On the other hand, a smoother ZnO surface leads to nucleation of a rough cladding layer which supports neither enhanced UV PL nor optical cavity modes. Finite-element analysis shows a clear correlation between allowed Fabry-Perot and whispering gallery modes and enhanced UV-PL. Finally, these results point the way to fabricating ZnO/MgO core-shell nanowires for more efficient UV nanolasers, scintillators, and sensors.},
doi = {10.1002/cnma.201700313},
journal = {ChemNanoMat},
number = 3,
volume = 4,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2018},
month = {Fri Jan 19 00:00:00 EST 2018}
}
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