Two-Dimensional Molybdenum Tungsten Diselenide Alloys: Photoluminescence, Raman Scattering, and Electrical Transport
Citations Over TimeTop 10% of 2014 papers
Abstract
Two-dimensional transition-metal dichalcogenide alloys have attracted intense attention due to their tunable band gaps. In the present work, photoluminescence, Raman scattering, and electrical transport properties of monolayer and few-layer molybdenum tungsten diselenide alloys (Mo1-xWxSe2, 0 ≤ x ≤ 1) are systematically investigated. The strong photoluminescence emissions from Mo1-xWxSe2 monolayers indicate composition-tunable direct band gaps (from 1.56 to 1.65 eV), while weak and broad emissions from the bilayers indicate indirect band gaps. The first-order Raman modes are assigned by polarized Raman spectroscopy. Second-order Raman modes are assigned according to its frequencies. As composition changes in Mo1-xWxSe2 monolayers and few layers, the out-of-plane A1g mode showed one-mode behavior, while B2g(1) (only observed in few layers), in-plane E2g(1), and all observed second-order Raman modes showed two-mode behaviors. Electrical transport measurement revealed n-type semiconducting transport behavior with a high on/off ratio (>10(5)) for Mo1-xWxSe2 monolayers.
Related Papers
- → Tungsten's redox potential is more temperature sensitive than that of molybdenum(2010)36 cited
- Thermodynamic analysis for separation of tungsten and molybdenum in W-Mo-H_2O system(2013)
- Remove of Molybdenum from Tungsten Solution by Ion Exchange(2003)
- → High-temperature mobility of atoms of the components in the system molybdenum-tungsten(1966)1 cited
- → ChemInform Abstract: PREPARATION AND PROPERTIES OF MOLYBDENUM AND TUNGSTEN DINITROGEN COMPLEXES. 8. IAZOALKANE COMPLEXES OF MOLYBDENUM AND TUNGSTEN(1978)