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Evaluation of carrier density and mobility in Mn ion-implanted GaAs:Zn nanowires by Raman spectroscopy

Kumar, Sandeep LU ; Corrêa, Gregório B. ; Devi, Chandni ; Jacobsson, Daniel LU ; Johannes, Andreas ; Ronning, Carsten ; Paraguassu, Waldeci ; Paschoal, Waldomiro LU and Pettersson, Hakan LU (2020) In Nanotechnology 31(20).
Abstract

The fabrication of complex nanoscale electronics with reduced dimensions poses challenges on novel techniques to accurately determine fundamental electronic parameters. In this article, we present a universal contactless method based on Raman scattering for measuring the mobility and hole concentration independently in GaAs:Zn and Mn ion-implanted GaAs:Zn nanowires, potentially of great interest for spintronics applications. Clear coupled longitudinal optical phonon-plasmon modes were recorded and fitted with a dielectric function, based on the Drude model, which includes contributions from both plasmons and phonons. From the fitting, we extract accurate values of the plasma frequency and plasma damping constant from which we directly... (More)

The fabrication of complex nanoscale electronics with reduced dimensions poses challenges on novel techniques to accurately determine fundamental electronic parameters. In this article, we present a universal contactless method based on Raman scattering for measuring the mobility and hole concentration independently in GaAs:Zn and Mn ion-implanted GaAs:Zn nanowires, potentially of great interest for spintronics applications. Clear coupled longitudinal optical phonon-plasmon modes were recorded and fitted with a dielectric function, based on the Drude model, which includes contributions from both plasmons and phonons. From the fitting, we extract accurate values of the plasma frequency and plasma damping constant from which we directly calculate the hole density and mobility, respectively. The extracted mobilities were also used as input data for analysis of complementary four-probe transport measurements, where the corresponding hole concentrations could be calculated and found to be in good agreement with those extracted directly from the Raman data. We also investigated the influence of annealing of the GaAs:Zn nanowires on the hole concentration and mobility and found strong indications of thermally activated defects related to a formed crystalline As/oxide shell around the nanowires. The method proposed here is extremely powerful for the characterization of nanoelectronics in general, and nanospintronics in particular for which Hall measurements are difficult to pursue due to problems related to contact formation, as well as to inherent magnetic properties of the devices.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dilute magnetic semiconductors, Nanowires, Raman spectroscopy
in
Nanotechnology
volume
31
issue
20
article number
205705
publisher
IOP Publishing
external identifiers
  • scopus:85082297722
  • pmid:31995520
ISSN
0957-4484
DOI
10.1088/1361-6528/ab70fa
language
English
LU publication?
yes
id
65177e5f-b062-408b-a673-c65bb51dcc69
date added to LUP
2020-04-02 14:17:35
date last changed
2021-01-06 05:29:26
@article{65177e5f-b062-408b-a673-c65bb51dcc69,
  abstract     = {<p>The fabrication of complex nanoscale electronics with reduced dimensions poses challenges on novel techniques to accurately determine fundamental electronic parameters. In this article, we present a universal contactless method based on Raman scattering for measuring the mobility and hole concentration independently in GaAs:Zn and Mn ion-implanted GaAs:Zn nanowires, potentially of great interest for spintronics applications. Clear coupled longitudinal optical phonon-plasmon modes were recorded and fitted with a dielectric function, based on the Drude model, which includes contributions from both plasmons and phonons. From the fitting, we extract accurate values of the plasma frequency and plasma damping constant from which we directly calculate the hole density and mobility, respectively. The extracted mobilities were also used as input data for analysis of complementary four-probe transport measurements, where the corresponding hole concentrations could be calculated and found to be in good agreement with those extracted directly from the Raman data. We also investigated the influence of annealing of the GaAs:Zn nanowires on the hole concentration and mobility and found strong indications of thermally activated defects related to a formed crystalline As/oxide shell around the nanowires. The method proposed here is extremely powerful for the characterization of nanoelectronics in general, and nanospintronics in particular for which Hall measurements are difficult to pursue due to problems related to contact formation, as well as to inherent magnetic properties of the devices.</p>},
  author       = {Kumar, Sandeep and Corrêa, Gregório B. and Devi, Chandni and Jacobsson, Daniel and Johannes, Andreas and Ronning, Carsten and Paraguassu, Waldeci and Paschoal, Waldomiro and Pettersson, Hakan},
  issn         = {0957-4484},
  language     = {eng},
  number       = {20},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Evaluation of carrier density and mobility in Mn ion-implanted GaAs:Zn nanowires by Raman spectroscopy},
  url          = {http://dx.doi.org/10.1088/1361-6528/ab70fa},
  doi          = {10.1088/1361-6528/ab70fa},
  volume       = {31},
  year         = {2020},
}