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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.21: Poster
Wednesday, March 29, 2023, 17:00–19:00, P3
In-situ formation of Mo6Te6 nanowire in single-layer 2H-MoTe2 by annealing and electron irradiation — •Janis Köster1, Silvan Kretschmer2, Michael K. Kinyanjui1, Alexander Storm1, Fabian Rasper1, Arkady V. Krasheninnikov2, and Ute Kaiser1 — 1Electron Microscopy of Materials Science, Ulm University, Albert Einstein Allee 11, 89081 Ulm, Germany — 2Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Up to now, the fundamental understanding of transformations in 2D materials at the atomic scale are not fully characterized. Here, we demonstrate a route to locally transform freestanding single-layer (1H-) MoTe2 [1] into 1D-Mo6Te6 nanowires [2] under electron beam irradiation and by heating. (HR)TEM at the Cc/Cs-corrected SALVE [3] microscope at 80 kV is used to analyse structural changes in the material. Combining the experimental data with the results of first-principles calculations, we explain energetics and stabilities of MoTe2 monolayers and Mo6Te6 nanowires due to an interplay of electron-beam-induced energy input, atom ejection, and oxygen absorption. A detailed understanding of high-temperature solid-to-solid phase transformation in the 2D limit provides insights into the material’s applicability for future device fabrication.
[1] J. Köster, et al. The Journal of Physical Chemistry C 125.24 (2021): 13601-13609.
[2] H. Kim, et al. Small 16.47 (2020): 2002849
[3] M. Linck, et al. Physical review letters 117.7 (2016): 076101