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Tip enhanced Raman spectroscopy vs. micro-Raman spectroscopy of InP/InGaP axially heterostructured nanowires for tandem solar cells

Mediavilla, I. ; Anaya, J. ; Pura, J. L. ; Hrachowina, L. LU ; Borgström, M. T. LU orcid and Jimenez, J. (2025) Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIV 2025 In Proceedings of SPIE - The International Society for Optical Engineering 13361.
Abstract

We present a Raman study of axially heterostructured InP/InGaP nanowires (NWs) for tandem solar cells. The study is carried out using both microRaman spectroscopy (µ-Raman), and tip enhanced Raman spectroscopy (TERS). The results obtained by both methods are compared. The results obtained with each one is supported by the simulation of the light/NW interaction using finite element methods. This simulation reveals the electromagnetic distribution in both cases and the regions of the NWs that are excited. We show that µ-Raman is detected in single NWs because of the diameter resonances, and resonances at the heterojunctions. Meanwhile, TERS is due to resonant local electromagnetic field generated by the AFM tip in contact with the NW,... (More)

We present a Raman study of axially heterostructured InP/InGaP nanowires (NWs) for tandem solar cells. The study is carried out using both microRaman spectroscopy (µ-Raman), and tip enhanced Raman spectroscopy (TERS). The results obtained by both methods are compared. The results obtained with each one is supported by the simulation of the light/NW interaction using finite element methods. This simulation reveals the electromagnetic distribution in both cases and the regions of the NWs that are excited. We show that µ-Raman is detected in single NWs because of the diameter resonances, and resonances at the heterojunctions. Meanwhile, TERS is due to resonant local electromagnetic field generated by the AFM tip in contact with the NW, providing the Raman signal arising from a region close to the NW surface. The advantage of TERS is its high lateral resolution as compared to the µ-Raman measurement, which has a poor lateral resolution. Even if the axial heterostructures can be resolved because of the associated resonances, only TERS gives a lateral resolution allowing 2-D Raman maps of the NWs.

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author
; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Finite element method, InP/InGaP NWs, Light/NW interaction, Micro Raman, Tandem solar cells, Tip enhanced Raman spectroscopy (TERS), Tunnel junction
host publication
Proceedings. Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIV
series title
Proceedings of SPIE - The International Society for Optical Engineering
editor
Freundlich, Alexandre ; Hinzer, Karin ; Sellers, Ian R. and Helmers, Henning
volume
13361
article number
133610A
publisher
SPIE
conference name
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIV 2025
conference location
San Francisco, United States
conference dates
2025-01-28 - 2025-01-30
external identifiers
  • scopus:105005944629
ISSN
0277-786X
1996-756X
ISBN
9781510684706
DOI
10.1117/12.3041849
language
English
LU publication?
yes
id
cea84f6b-318f-48b9-8ccd-32e6e74e8877
date added to LUP
2025-09-15 15:30:07
date last changed
2025-10-14 13:03:16
@inproceedings{cea84f6b-318f-48b9-8ccd-32e6e74e8877,
  abstract     = {{<p>We present a Raman study of axially heterostructured InP/InGaP nanowires (NWs) for tandem solar cells. The study is carried out using both microRaman spectroscopy (µ-Raman), and tip enhanced Raman spectroscopy (TERS). The results obtained by both methods are compared. The results obtained with each one is supported by the simulation of the light/NW interaction using finite element methods. This simulation reveals the electromagnetic distribution in both cases and the regions of the NWs that are excited. We show that µ-Raman is detected in single NWs because of the diameter resonances, and resonances at the heterojunctions. Meanwhile, TERS is due to resonant local electromagnetic field generated by the AFM tip in contact with the NW, providing the Raman signal arising from a region close to the NW surface. The advantage of TERS is its high lateral resolution as compared to the µ-Raman measurement, which has a poor lateral resolution. Even if the axial heterostructures can be resolved because of the associated resonances, only TERS gives a lateral resolution allowing 2-D Raman maps of the NWs.</p>}},
  author       = {{Mediavilla, I. and Anaya, J. and Pura, J. L. and Hrachowina, L. and Borgström, M. T. and Jimenez, J.}},
  booktitle    = {{Proceedings. Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIV}},
  editor       = {{Freundlich, Alexandre and Hinzer, Karin and Sellers, Ian R. and Helmers, Henning}},
  isbn         = {{9781510684706}},
  issn         = {{0277-786X}},
  keywords     = {{Finite element method; InP/InGaP NWs; Light/NW interaction; Micro Raman; Tandem solar cells; Tip enhanced Raman spectroscopy (TERS); Tunnel junction}},
  language     = {{eng}},
  publisher    = {{SPIE}},
  series       = {{Proceedings of SPIE - The International Society for Optical Engineering}},
  title        = {{Tip enhanced Raman spectroscopy vs. micro-Raman spectroscopy of InP/InGaP axially heterostructured nanowires for tandem solar cells}},
  url          = {{http://dx.doi.org/10.1117/12.3041849}},
  doi          = {{10.1117/12.3041849}},
  volume       = {{13361}},
  year         = {{2025}},
}