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Photoluminescence study of as-grown vertically standing wurtzite InP nanowire ensembles.

Iqbal, Azhar LU ; Beech, Jason LU ; Anttu, Nicklas LU ; Pistol, Mats-Erik LU ; Samuelson, Lars LU ; Borgström, Magnus LU and Yartsev, Arkady LU (2013) In Nanotechnology 24(11).
Abstract
We demonstrate a method that enables the study of photoluminescence of as-grown nanowires on a native substrate by non-destructively suppressing the contribution of substrate photoluminescence. This is achieved by using polarized photo-excitation and photoluminescence and by making an appropriate choice of incident angle of both excitation beam and photoluminescence collection direction. Using T-polarized excitation at a wavelength of 488 nm at an incident angle of ∼70° we suppress the InP substrate photoluminescence relative to that of the InP nanowires by about 80 times. Consequently, the photoluminescence originating from the nanowires becomes comparable to and easily distinguishable from the substrate photoluminescence. The measured... (More)
We demonstrate a method that enables the study of photoluminescence of as-grown nanowires on a native substrate by non-destructively suppressing the contribution of substrate photoluminescence. This is achieved by using polarized photo-excitation and photoluminescence and by making an appropriate choice of incident angle of both excitation beam and photoluminescence collection direction. Using T-polarized excitation at a wavelength of 488 nm at an incident angle of ∼70° we suppress the InP substrate photoluminescence relative to that of the InP nanowires by about 80 times. Consequently, the photoluminescence originating from the nanowires becomes comparable to and easily distinguishable from the substrate photoluminescence. The measured photoluminescence, which peaks at photon energies of ∼1.35 eV and ∼1.49 eV, corresponds to the InP substrate with zinc-blende crystal structure and to the InP nanowires with wurtzite crystal structure, respectively. The photoluminescence quantum yield of the nanowires was found to be ∼20 times lower than that of the InP substrate. The nanowires, grown vertically in a random ensemble, neither exhibit substantial emission polarization selectivity to the axis of the nanowires nor follow excitation polarization preferences observed previously for a single nanowire. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanotechnology
volume
24
issue
11
publisher
IOP Publishing
external identifiers
  • wos:000315715300021
  • pmid:23455456
  • scopus:84874876358
ISSN
0957-4484
DOI
10.1088/0957-4484/24/11/115706
language
English
LU publication?
yes
id
e3bb2511-5c1a-481a-a06c-e28bae49773f (old id 3628690)
date added to LUP
2013-04-15 12:42:18
date last changed
2019-02-20 01:55:35
@article{e3bb2511-5c1a-481a-a06c-e28bae49773f,
  abstract     = {We demonstrate a method that enables the study of photoluminescence of as-grown nanowires on a native substrate by non-destructively suppressing the contribution of substrate photoluminescence. This is achieved by using polarized photo-excitation and photoluminescence and by making an appropriate choice of incident angle of both excitation beam and photoluminescence collection direction. Using T-polarized excitation at a wavelength of 488 nm at an incident angle of ∼70° we suppress the InP substrate photoluminescence relative to that of the InP nanowires by about 80 times. Consequently, the photoluminescence originating from the nanowires becomes comparable to and easily distinguishable from the substrate photoluminescence. The measured photoluminescence, which peaks at photon energies of ∼1.35 eV and ∼1.49 eV, corresponds to the InP substrate with zinc-blende crystal structure and to the InP nanowires with wurtzite crystal structure, respectively. The photoluminescence quantum yield of the nanowires was found to be ∼20 times lower than that of the InP substrate. The nanowires, grown vertically in a random ensemble, neither exhibit substantial emission polarization selectivity to the axis of the nanowires nor follow excitation polarization preferences observed previously for a single nanowire.},
  articleno    = {115706},
  author       = {Iqbal, Azhar and Beech, Jason and Anttu, Nicklas and Pistol, Mats-Erik and Samuelson, Lars and Borgström, Magnus and Yartsev, Arkady},
  issn         = {0957-4484},
  language     = {eng},
  number       = {11},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Photoluminescence study of as-grown vertically standing wurtzite InP nanowire ensembles.},
  url          = {http://dx.doi.org/10.1088/0957-4484/24/11/115706},
  volume       = {24},
  year         = {2013},
}