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Tunable absorption resonances in the ultraviolet for InP nanowire arrays

Aghaeipour, Mahtab; Anttu, Nicklas LU ; Nylund, Gustav; Samuelson, Lars; Lehmann, Sebastian and Pistol, Mats-Erik (2014) In Optics Express 22(23). p.29204-29212
Abstract
The ability to tune the photon absorptance spectrum is an attracting way of tailoring the response of devices like photodetectors and solar cells. Here, we measure the reflectance spectra of InP substrates patterned with arrays of vertically standing InP nanowires. Using the reflectance spectra, we calculate and analyze the corresponding absorptance spectra of the nanowires. We show that we can tune absorption resonances for the nanowire arrays into the ultraviolet by decreasing the diameter of the nanowires. When we compare our measurements with electromagnetic modeling, we generally find good agreement. Interestingly, the remaining differences between modeled and measured spectra are attributed to a crystal-phase dependence in the... (More)
The ability to tune the photon absorptance spectrum is an attracting way of tailoring the response of devices like photodetectors and solar cells. Here, we measure the reflectance spectra of InP substrates patterned with arrays of vertically standing InP nanowires. Using the reflectance spectra, we calculate and analyze the corresponding absorptance spectra of the nanowires. We show that we can tune absorption resonances for the nanowire arrays into the ultraviolet by decreasing the diameter of the nanowires. When we compare our measurements with electromagnetic modeling, we generally find good agreement. Interestingly, the remaining differences between modeled and measured spectra are attributed to a crystal-phase dependence in the refractive index of InP. Specifically, we find indication of significant differences in the refractive index between the modeled zinc-blende InP nanowires and the measured wurtzite InP nanowires in the ultraviolet. We believe that such crystal-phase dependent differences in the refractive index affect the possibility to excite optical resonances in the large wavelength range of 345 < lambda < 390 nm. To support this claim, we investigated how resonances in nanostructures can be shifted in wavelength by geometrical tuning. We find that dispersion in the refractive index can dominate over geometrical tuning and stop the possibility for such shifting. Our results open the door for using crystal-phase engineering to optimize the absorption in InP nanowire-based solar cells and photodetectors. (C) 2014 Optical Society of America (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
22
issue
23
pages
29204 - 29212
publisher
OSA
external identifiers
  • wos:000345268500140
  • scopus:84913580335
ISSN
1094-4087
DOI
10.1364/OE.22.029204
language
English
LU publication?
yes
id
11dfe46b-f812-4afe-bfba-154569c5e3d3 (old id 4982987)
date added to LUP
2015-01-27 09:38:15
date last changed
2017-11-12 03:43:01
@article{11dfe46b-f812-4afe-bfba-154569c5e3d3,
  abstract     = {The ability to tune the photon absorptance spectrum is an attracting way of tailoring the response of devices like photodetectors and solar cells. Here, we measure the reflectance spectra of InP substrates patterned with arrays of vertically standing InP nanowires. Using the reflectance spectra, we calculate and analyze the corresponding absorptance spectra of the nanowires. We show that we can tune absorption resonances for the nanowire arrays into the ultraviolet by decreasing the diameter of the nanowires. When we compare our measurements with electromagnetic modeling, we generally find good agreement. Interestingly, the remaining differences between modeled and measured spectra are attributed to a crystal-phase dependence in the refractive index of InP. Specifically, we find indication of significant differences in the refractive index between the modeled zinc-blende InP nanowires and the measured wurtzite InP nanowires in the ultraviolet. We believe that such crystal-phase dependent differences in the refractive index affect the possibility to excite optical resonances in the large wavelength range of 345 &lt; lambda &lt; 390 nm. To support this claim, we investigated how resonances in nanostructures can be shifted in wavelength by geometrical tuning. We find that dispersion in the refractive index can dominate over geometrical tuning and stop the possibility for such shifting. Our results open the door for using crystal-phase engineering to optimize the absorption in InP nanowire-based solar cells and photodetectors. (C) 2014 Optical Society of America},
  author       = {Aghaeipour, Mahtab and Anttu, Nicklas and Nylund, Gustav and Samuelson, Lars and Lehmann, Sebastian and Pistol, Mats-Erik},
  issn         = {1094-4087},
  language     = {eng},
  number       = {23},
  pages        = {29204--29212},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Tunable absorption resonances in the ultraviolet for InP nanowire arrays},
  url          = {http://dx.doi.org/10.1364/OE.22.029204},
  volume       = {22},
  year         = {2014},
}