Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires

Marvinney, Claire E.; Shen, Xiao; McBride, James R.; Critchlow, Dominic; Li, Zhineng; Mayo, Daniel C.; Mu, Richard R.; Pantelides, Sokrates T.; Haglund, Richard F.

doi:10.1002/cnma.201700313

Effect of Material Structure on Photoluminescence of ZnO/MgO Core-Shell Nanowires

Journal Article · Fri Jan 19 00:00:00 EST 2018 · ChemNanoMat

DOI:https://doi.org/10.1002/cnma.201700313· OSTI ID:1597869

Marvinney, Claire E. ^[1]; Shen, Xiao ^[2]; McBride, James R. ^[3]; Critchlow, Dominic ^[4]; Li, Zhineng ^[5]; Mayo, Daniel C. ^[6]; Mu, Richard R. ^[7]; Pantelides, Sokrates T. ^[3]; Haglund, Richard F. ^[3]

Vanderbilt Univ., Nashville, TN (United States); Vanderbilt University
Vanderbilt Univ., Nashville, TN (United States); Univ. of Memphis, TN (United States)
Vanderbilt Univ., Nashville, 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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-01ER45916; FG02-09ER46554

OSTI ID:: 1597869

Alternate ID(s):: OSTI ID: 1423703

Journal Information:: ChemNanoMat, Journal Name: ChemNanoMat Journal Issue: 3 Vol. 4; ISSN 2199-692X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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