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

Sandeep Kumar, Gregório B. Corrêa, Chandni Devi, Daniel Jacobsson, Andreas Johannes, Carsten Ronning, Waldeci Paraguassu, Waldomiro Paschoal, Hakan Pettersson

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

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 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.

Original languageEnglish
Article number205705
JournalNanotechnology
Volume31
Issue number20
DOIs
Publication statusPublished - 2020

Subject classification (UKÄ)

  • Nano Technology
  • Condensed Matter Physics

Keywords

  • Dilute magnetic semiconductors
  • Nanowires
  • Raman spectroscopy

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