Ordered growth of hexagonal and monoclinic phases of MoTe2 on a sapphire substrate

Literature Information

Publication Date 2023-09-07
DOI 10.1039/D3CE00378G
Impact Factor 3.545
Authors

Edmund Dobročka, Tatiana Vojteková, Yuriy Halahovets, Michaela Sojková, Jana Hrdá, Marián Precner, Zhuo Chen, Yong Huang, Sergej Ražnjević, Zaoli Zhang, Martin Hulman


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Abstract

The transition metal dichalcogenides have been studied for various applications in electronics, sensing, or spintronics. Molybdenum ditelluride, MoTe2, occurs in 3 crystal systems: hexagonal (2H), monoclinic (1T′), and orthorhombic (Td). Here we report on tellurisation of Mo and MoO3 thin films to 2H-MoTe2 and 1T′-MoTe2 thin layers on sapphire substrates, respectively. To study the phases, we employed diffraction patterns using grazing-incidence wide-angle X-ray scattering, conventional X-ray diffraction and transmission electron microscopy (TEM). Measurements of pole figures confirmed the presence of a biaxial texture of both 1T′ and 2H phases. In the hexagonal phase, we found two ensembles of biaxially oriented crystallites offset by 30 degrees between the two groups. On the other hand, in the monoclinic layer, the crystallites follow the six-fold symmetry of the (0001) sapphire surface.

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CrystEngComm

CrystEngComm
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