V2O5: A 2D van der Waals Oxide with Strong In-Plane Electrical and Optical Anisotropy

Sukrit Sucharitakul, Gaihua Ye, Walter R.L. Lambrecht, Churna Bhandari, Axel Gross, Rui He, Hilde Poelman, Xuan P.A. Gao

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

V2O5 with a layered van der Waals (vdW) structure has been widely studied because of the material's potential in applications such as battery electrodes. In this work, microelectronic devices were fabricated to study the electrical and optical properties of mechanically exfoliated multilayered V2O5 flakes. Raman spectroscopy was used to determine the crystal structure axes of the nanoflakes and revealed that the intensities of the Raman modes depend strongly on the relative orientation between the crystal axes and the polarization directions of incident/scattered light. Angular dependence of four-probe resistance measured in the van der Pauw (vdP) configuration revealed an in-plane anisotropic resistance ratio of ∼100 between the a and b crystal axes, the largest in-plane transport anisotropy effect experimentally reported for two-dimensional (2D) materials to date. This very large resistance anisotropic ratio is explained by the nonuniform current flow in the vdP measurement and an intrinsic mobility anisotropy ratio of 10 between the a and b crystal axes. Room-temperature electron Hall mobility up to 7 cm2/(V s) along the high-mobility direction was obtained. This work demonstrates V2O5 as a layered 2D vdW oxide material with strongly anisotropic optical and electronic properties for novel applications.

Original languageEnglish
Pages (from-to)23949-23956
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number28
DOIs
StatePublished - Jul 19 2017

Keywords

  • 2D material
  • Raman
  • anisotropy
  • transport
  • vanadium pentoxide

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