Orientation-dependent optical characterization of atomically thin transition metal ditellurides

Anh Tuan Hoang, Sachin M. Shinde, Ajit K. Katiyar, Krishna P. Dhakal, Xiang Chen, Hyunmin Kim, Suk Woo Lee, Zonghoon Lee, Jong Hyun Ahn

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4 Citations (Scopus)

Abstract

Molybdenum ditellurides (MoTe2) have recently attracted attention owing to their excellent structurally tunable nature between 1T′(metallic)- and 2H(semiconducting)-phases; thus, the controllable fabrication and critical identification of MoTe2 are highly desired. Here, we semi-controllably synthesized 1T′- and 2H-MoTe2 crystals using the atmospheric pressure chemical vapor deposition (APCVD) technique and studied their grain-orientation dependency using polarization-sensitive optical microscopy, Raman scattering, and second-harmonic generation (SHG) microspectroscopy. The polycrystalline 1T′-MoTe2 phase with quasi-1D "Mo-Mo" zigzag chains showed anisotropic optical absorption, leading to a clear visualization of the lattice domains. On the other hand, 2H-MoTe2 lattice grains did not exhibit any discernible difference under polarized light illumination. The combined aforementioned microscopy techniques could be used as an easy-to-access and non-destructive tool for a quick and solid identification of intended lattice orientation development in industry-scale MoTe2 crystal manufacturing.

Original languageEnglish
Pages (from-to)21978-21984
Number of pages7
JournalNanoscale
Volume10
Issue number46
DOIs
Publication statusPublished - 2018 Dec 14

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Hoang, A. T., Shinde, S. M., Katiyar, A. K., Dhakal, K. P., Chen, X., Kim, H., Lee, S. W., Lee, Z., & Ahn, J. H. (2018). Orientation-dependent optical characterization of atomically thin transition metal ditellurides. Nanoscale, 10(46), 21978-21984. https://doi.org/10.1039/c8nr07592a