Advanced

Absorption and transmission of light in III-V nanowire arrays for tandem solar cell applications

Anttu, Nicklas LU ; Dagyte, Vilgaile LU ; Zeng, Xulu LU ; Otnes, Gaute LU and Borgström, Magnus LU (2017) In Nanotechnology 28(20).
Abstract

III-V semiconductor nanowires are a platform for next-generation photovoltaics. An interesting research direction is to embed a nanowire array in a transparent polymer, either to act as a stand-alone flexible solar cell, or to be stacked on top of a conventional Si bottom cell to create a tandem structure. To optimize the tandem cell performance, high energy photons should be absorbed in the nanowires whereas low energy photons should be transmitted to and absorbed in the Si cell. Here, through optical measurements on 1.95 eV bandgap GaInP nanowire arrays embedded in a polymer membrane, we identify two mechanisms that could be detrimental for the performance of the tandem cell. First, the Au particles used in the nanowire synthesis can... (More)

III-V semiconductor nanowires are a platform for next-generation photovoltaics. An interesting research direction is to embed a nanowire array in a transparent polymer, either to act as a stand-alone flexible solar cell, or to be stacked on top of a conventional Si bottom cell to create a tandem structure. To optimize the tandem cell performance, high energy photons should be absorbed in the nanowires whereas low energy photons should be transmitted to and absorbed in the Si cell. Here, through optical measurements on 1.95 eV bandgap GaInP nanowire arrays embedded in a polymer membrane, we identify two mechanisms that could be detrimental for the performance of the tandem cell. First, the Au particles used in the nanowire synthesis can absorb >50% of the low-energy photons, leading to a <40% transmittance, even though the Au particles cover <15% of the surface area. The removal of the Au particles can recover the transmission of low energy photons to >80%. Second, after the removal of the Au particles, a 40% reflectance peak shows up due to resonant back-scattering of light from in-plane waveguide modes. To avoid the excitation of these optical modes in the nanowire array, we propose to limit the pitch of the nanowire array.

(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
absorption, III-V nanowires, photovoltaics, transmission
in
Nanotechnology
volume
28
issue
20
publisher
IOP Publishing
external identifiers
  • scopus:85019005584
  • wos:000400096300001
ISSN
0957-4484
DOI
10.1088/1361-6528/aa6aee
language
English
LU publication?
yes
id
d3317d79-1b14-4a07-9de6-5e35598bc619
date added to LUP
2017-06-01 09:08:27
date last changed
2018-06-10 05:19:20
@article{d3317d79-1b14-4a07-9de6-5e35598bc619,
  abstract     = {<p>III-V semiconductor nanowires are a platform for next-generation photovoltaics. An interesting research direction is to embed a nanowire array in a transparent polymer, either to act as a stand-alone flexible solar cell, or to be stacked on top of a conventional Si bottom cell to create a tandem structure. To optimize the tandem cell performance, high energy photons should be absorbed in the nanowires whereas low energy photons should be transmitted to and absorbed in the Si cell. Here, through optical measurements on 1.95 eV bandgap GaInP nanowire arrays embedded in a polymer membrane, we identify two mechanisms that could be detrimental for the performance of the tandem cell. First, the Au particles used in the nanowire synthesis can absorb &gt;50% of the low-energy photons, leading to a &lt;40% transmittance, even though the Au particles cover &lt;15% of the surface area. The removal of the Au particles can recover the transmission of low energy photons to &gt;80%. Second, after the removal of the Au particles, a 40% reflectance peak shows up due to resonant back-scattering of light from in-plane waveguide modes. To avoid the excitation of these optical modes in the nanowire array, we propose to limit the pitch of the nanowire array.</p>},
  articleno    = {205203},
  author       = {Anttu, Nicklas and Dagyte, Vilgaile and Zeng, Xulu and Otnes, Gaute and Borgström, Magnus},
  issn         = {0957-4484},
  keyword      = {absorption,III-V nanowires,photovoltaics,transmission},
  language     = {eng},
  month        = {04},
  number       = {20},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Absorption and transmission of light in III-V nanowire arrays for tandem solar cell applications},
  url          = {http://dx.doi.org/10.1088/1361-6528/aa6aee},
  volume       = {28},
  year         = {2017},
}