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Bias-dependent spectral tuning in InP nanowire-based photodetectors

Jain, Vishal LU ; Heurlin, Magnus LU ; Karimi, Mohammad LU ; Hussain, Laiq LU ; Aghaeipour, Mahtab LU ; Nowzari, Ali LU ; Berg, Alexander LU ; Nylund, Gustav LU ; Capasso, Federico and Samuelson, Lars LU , et al. (2017) In Nanotechnology 28(11).
Abstract

Nanowire array ensembles contacted in a vertical geometry are extensively studied and considered strong candidates for next generations of industrial scale optoelectronics. Key challenges in this development deal with optimization of the doping profile of the nanowires and the interface between nanowires and transparent top contact. Here we report on photodetection characteristics associated with doping profile variations in InP nanowire array photodetectors. Bias-dependent tuning of the spectral shape of the responsivity is observed which is attributed to a Schottky-like contact at the nanowire-ITO interface. Angular dependent responsivity measurements, compared with simulated absorption spectra, support this conclusion. Furthermore,... (More)

Nanowire array ensembles contacted in a vertical geometry are extensively studied and considered strong candidates for next generations of industrial scale optoelectronics. Key challenges in this development deal with optimization of the doping profile of the nanowires and the interface between nanowires and transparent top contact. Here we report on photodetection characteristics associated with doping profile variations in InP nanowire array photodetectors. Bias-dependent tuning of the spectral shape of the responsivity is observed which is attributed to a Schottky-like contact at the nanowire-ITO interface. Angular dependent responsivity measurements, compared with simulated absorption spectra, support this conclusion. Furthermore, electrical simulations unravel the role of possible self-gating effects in the nanowires induced by the ITO/SiO x wrap-gate geometry. Finally, we discuss possible reasons for the observed low saturation current at large forward biases.

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Contribution to journal
publication status
published
subject
keywords
IR photodetectors, nanophotonics, nanowire arrays, nanowires, solar cells
in
Nanotechnology
volume
28
issue
11
publisher
IOP Publishing
external identifiers
  • scopus:85014564717
  • wos:000395937500001
ISSN
0957-4484
DOI
10.1088/1361-6528/aa5236
language
English
LU publication?
yes
id
3724b34f-ca0d-4ae4-b163-cadf5657a5a8
date added to LUP
2017-03-15 08:43:39
date last changed
2018-06-10 05:17:07
@article{3724b34f-ca0d-4ae4-b163-cadf5657a5a8,
  abstract     = {<p>Nanowire array ensembles contacted in a vertical geometry are extensively studied and considered strong candidates for next generations of industrial scale optoelectronics. Key challenges in this development deal with optimization of the doping profile of the nanowires and the interface between nanowires and transparent top contact. Here we report on photodetection characteristics associated with doping profile variations in InP nanowire array photodetectors. Bias-dependent tuning of the spectral shape of the responsivity is observed which is attributed to a Schottky-like contact at the nanowire-ITO interface. Angular dependent responsivity measurements, compared with simulated absorption spectra, support this conclusion. Furthermore, electrical simulations unravel the role of possible self-gating effects in the nanowires induced by the ITO/SiO <sub>x</sub> wrap-gate geometry. Finally, we discuss possible reasons for the observed low saturation current at large forward biases.</p>},
  articleno    = {114006},
  author       = {Jain, Vishal and Heurlin, Magnus and Karimi, Mohammad and Hussain, Laiq and Aghaeipour, Mahtab and Nowzari, Ali and Berg, Alexander and Nylund, Gustav and Capasso, Federico and Samuelson, Lars and Borgström, Magnus T. and Pettersson, Håkan},
  issn         = {0957-4484},
  keyword      = {IR photodetectors,nanophotonics,nanowire arrays,nanowires,solar cells},
  language     = {eng},
  month        = {02},
  number       = {11},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Bias-dependent spectral tuning in InP nanowire-based photodetectors},
  url          = {http://dx.doi.org/10.1088/1361-6528/aa5236},
  volume       = {28},
  year         = {2017},
}