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Absorption of light in InP nanowire arrays

Anttu, Nicklas LU ; Abrand, Alireza; Asoli, Damir; Heurlin, Magnus LU ; Aberg, Ingvar; Samuelson, Lars LU and Borgström, Magnus LU (2014) In Nano Reseach 7(6). p.816-823
Abstract
An understanding of the absorption of light is essential for efficient photovoltaic and photodetection applications with III-V nanowire arrays. Here, we correlate experiments with modeling and verify experimentally the predicted absorption of light in InP nanowire arrays for varying nanowire diameter and length. We find that 2,000 nm long nanowires in a pitch of 400 nm can absorb 94% of the incident light with energy above the band gap and, as a consequence, light which in a simple ray-optics description would be travelling between the nanowires can be efficiently absorbed by the nanowires. Our measurements demonstrate that the absorption for long nanowires is limited by insertion reflection losses when light is coupled from the air... (More)
An understanding of the absorption of light is essential for efficient photovoltaic and photodetection applications with III-V nanowire arrays. Here, we correlate experiments with modeling and verify experimentally the predicted absorption of light in InP nanowire arrays for varying nanowire diameter and length. We find that 2,000 nm long nanowires in a pitch of 400 nm can absorb 94% of the incident light with energy above the band gap and, as a consequence, light which in a simple ray-optics description would be travelling between the nanowires can be efficiently absorbed by the nanowires. Our measurements demonstrate that the absorption for long nanowires is limited by insertion reflection losses when light is coupled from the air top-region into the array. These reflection losses can be reduced by introducing a smaller diameter to the nanowire-part closest to the air top-region. For nanowire arrays with such a nanowire morphology modulation, we find that the absorptance increases monotonously with increasing diameter of the rest of the nanowire. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
indium phosphide, semiconductor, nanowire, absorption of light
in
Nano Reseach
volume
7
issue
6
pages
816 - 823
publisher
Springer
external identifiers
  • wos:000339892000002
  • scopus:84902331188
ISSN
1998-0124
DOI
10.1007/s12274-014-0442-y
language
English
LU publication?
yes
id
6739f346-373f-469e-b972-661de15d3412 (old id 4667904)
date added to LUP
2014-09-25 14:27:56
date last changed
2017-11-19 03:22:03
@article{6739f346-373f-469e-b972-661de15d3412,
  abstract     = {An understanding of the absorption of light is essential for efficient photovoltaic and photodetection applications with III-V nanowire arrays. Here, we correlate experiments with modeling and verify experimentally the predicted absorption of light in InP nanowire arrays for varying nanowire diameter and length. We find that 2,000 nm long nanowires in a pitch of 400 nm can absorb 94% of the incident light with energy above the band gap and, as a consequence, light which in a simple ray-optics description would be travelling between the nanowires can be efficiently absorbed by the nanowires. Our measurements demonstrate that the absorption for long nanowires is limited by insertion reflection losses when light is coupled from the air top-region into the array. These reflection losses can be reduced by introducing a smaller diameter to the nanowire-part closest to the air top-region. For nanowire arrays with such a nanowire morphology modulation, we find that the absorptance increases monotonously with increasing diameter of the rest of the nanowire.},
  author       = {Anttu, Nicklas and Abrand, Alireza and Asoli, Damir and Heurlin, Magnus and Aberg, Ingvar and Samuelson, Lars and Borgström, Magnus},
  issn         = {1998-0124},
  keyword      = {indium phosphide,semiconductor,nanowire,absorption of light},
  language     = {eng},
  number       = {6},
  pages        = {816--823},
  publisher    = {Springer},
  series       = {Nano Reseach},
  title        = {Absorption of light in InP nanowire arrays},
  url          = {http://dx.doi.org/10.1007/s12274-014-0442-y},
  volume       = {7},
  year         = {2014},
}