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Probing strain in wurtzite InP-InAs core-shell nanowires with Raman spectroscopy

Zhao, Yongqian ; Xue, Mengfei ; Göransson, D. J.O. LU ; Borgström, M. T. LU ; Xu, H. Q. LU and Chen, Jianing LU (2021) In Physical Review B 104(23).
Abstract

We used Raman spectroscopy to investigate phonon modes of single InP-InAs core-shell nanowire with a pure wurtzite phase to reveal the embedded strained state. Raman spectra show that the InP core exhibits tensile strain and the InAs shell exhibits compressive strain due to the radial heterostructure growth. Using different polarization excitation configurations, we identified distinct A1 (TO) and E1 (TO) modes, atomic vibrations along and perpendicular to the [0001] direction, respectively. We also identified E2h phonon modes in wurtzite InP and InAs, lattice vibration along with the [0001] direction, a fingerprint to distinguish a wurtzite phase from a zinc-blende phase. The Raman spectra changes reveal the resonance effects of InP... (More)

We used Raman spectroscopy to investigate phonon modes of single InP-InAs core-shell nanowire with a pure wurtzite phase to reveal the embedded strained state. Raman spectra show that the InP core exhibits tensile strain and the InAs shell exhibits compressive strain due to the radial heterostructure growth. Using different polarization excitation configurations, we identified distinct A1 (TO) and E1 (TO) modes, atomic vibrations along and perpendicular to the [0001] direction, respectively. We also identified E2h phonon modes in wurtzite InP and InAs, lattice vibration along with the [0001] direction, a fingerprint to distinguish a wurtzite phase from a zinc-blende phase. The Raman spectra changes reveal the resonance effects of InP and InAs between the E0+Δ0 energy level and the E1 gap by varying excitation energy, which indicates Γ7c-Γ6v transition consists of a split-off valence band and a band-gap transition along [0001] directions of the Brillouin zone. The polar patterns show the Raman A1 (TO) mode of InP only predominates in the x(yy)x¯ configuration, indicating the InP A1 (TO) phonon is sensitive to excitation polarization, suggesting the resonant Raman spectroscopy with specific polarization offers a direct way for characterizing wurtzite InP. Our findings deepen the understanding of strain in wurtzite-phase core-shell nanowire, providing a significant reference for engineering strain in core-shell nanowire to control optical and electric properties.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
104
issue
23
article number
235309
publisher
American Physical Society
external identifiers
  • scopus:85122523403
ISSN
2469-9950
DOI
10.1103/PhysRevB.104.235309
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 American Physical Society.
id
5e34dd54-8a8e-4f40-a495-dead1979a682
date added to LUP
2022-02-06 12:13:53
date last changed
2023-11-02 01:46:11
@article{5e34dd54-8a8e-4f40-a495-dead1979a682,
  abstract     = {{<p>We used Raman spectroscopy to investigate phonon modes of single InP-InAs core-shell nanowire with a pure wurtzite phase to reveal the embedded strained state. Raman spectra show that the InP core exhibits tensile strain and the InAs shell exhibits compressive strain due to the radial heterostructure growth. Using different polarization excitation configurations, we identified distinct A1 (TO) and E1 (TO) modes, atomic vibrations along and perpendicular to the [0001] direction, respectively. We also identified E2h phonon modes in wurtzite InP and InAs, lattice vibration along with the [0001] direction, a fingerprint to distinguish a wurtzite phase from a zinc-blende phase. The Raman spectra changes reveal the resonance effects of InP and InAs between the E0+Δ0 energy level and the E1 gap by varying excitation energy, which indicates Γ7c-Γ6v transition consists of a split-off valence band and a band-gap transition along [0001] directions of the Brillouin zone. The polar patterns show the Raman A1 (TO) mode of InP only predominates in the x(yy)x¯ configuration, indicating the InP A1 (TO) phonon is sensitive to excitation polarization, suggesting the resonant Raman spectroscopy with specific polarization offers a direct way for characterizing wurtzite InP. Our findings deepen the understanding of strain in wurtzite-phase core-shell nanowire, providing a significant reference for engineering strain in core-shell nanowire to control optical and electric properties.</p>}},
  author       = {{Zhao, Yongqian and Xue, Mengfei and Göransson, D. J.O. and Borgström, M. T. and Xu, H. Q. and Chen, Jianing}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{23}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Probing strain in wurtzite InP-InAs core-shell nanowires with Raman spectroscopy}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.104.235309}},
  doi          = {{10.1103/PhysRevB.104.235309}},
  volume       = {{104}},
  year         = {{2021}},
}