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Issue 46, 2018
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Orientation-dependent optical characterization of atomically thin transition metal ditellurides

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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.

Graphical abstract: Orientation-dependent optical characterization of atomically thin transition metal ditellurides

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Publication details

The article was received on 18 Sep 2018, accepted on 22 Oct 2018 and first published on 19 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07592A
Nanoscale, 2018,10, 21978-21984

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    Orientation-dependent optical characterization of atomically thin transition metal ditellurides

    A. T. Hoang, S. M. Shinde, A. K. Katiyar, K. P. Dhakal, X. Chen, H. Kim, S. W. Lee, Z. Lee and J. Ahn, Nanoscale, 2018, 10, 21978
    DOI: 10.1039/C8NR07592A

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