Telluride-Based Atomically Thin Layers of Ternary Two-Dimensional Transition Metal Dichalcogenide Alloys
| Autor: | Aiichiro Nakano, Amey Apte, Jordan A. Hachtel, Aravind Krishnamoorthy, Priya Vashishta, Chandra Sekhar Tiwary, Sandhya Susarla, Rajiv K. Kalia, Pulickel M. Ajayan, Juan Carlos Idrobo |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Thin layers Band gap Chalcogenide General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chalcogen chemistry.chemical_compound chemistry Transition metal Chemical physics Telluride Selenide Monolayer Materials Chemistry 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 30:7262-7268 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Alloying in two-dimensional (2D) transition metal dichalcogenides (TMDCs) has allowed band gap engineering and phase transformation, as well as modulation of electronic properties. However, most of the efforts have been focused on alloying between transition metal cations. Among those that emphasize alloying between chalcogenide anions, the sulfide–selenide combinations are popular with a few reports on selenide–telluride combinations. In this work, we show a facile chemical vapor deposition method to obtain stable alloying between selenide and telluride anions in monolayer MoSe2(1–x)Te2x alloy. These alloys retain the monolayer 2H symmetry and show good photoluminescence and band gap tunability in the near-infrared region. The nature and percentage of alloying is further confirmed and quantified via AFM, XPS, and HAADF-STEM imaging and polarized Raman spectroscopy. The stability of the two chalcogens in the monolayer 2H lattice is also consistent with thermodynamic phase mixing via DFT simulations. The w... |
| Databáze: | OpenAIRE |
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