Transition Metal Dichalcogenides: Synthesis and Application
A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".
Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 252
Special Issue Editor
Interests: extreme scattering engineering; nanoantennas; advanced optoelectronic devices; optics of 2D TMDC; valleytronics; low-loss high-index dielectric nanostructures; novel coherent effects in photonics
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Special Issue Information
Dear Colleagues,
Single layered (2D) transition metal dichalcogenides (TMDCs), like MoS2, MoSe2, WS2, and WSe2, are a prominent example of new materials with unique optical and electronic properties. Such materials behave as 2D semiconductors with bandgaps lying in the visible and IR ranges. In the monolayer limit, TMDCs are of particular interest, as their bandgaps become direct, which enables an enhanced strong light–matter interaction. As a result, the resonant excitonic absorption of a single TMD monolayer can be as large as 5%–20%. Strong excitonic resonances govern the optical properties of 2D TMDCs because of their reduced dielectric screening and strong Coulomb interactions between the charged particles (electrons and holes). As a result, such excitons have large binding energies of 0.2–0.8 eV. Moreover, charged excitons (trions) and excitonic molecules have also been demonstrated at low temperatures.
Because of the monolayer nature of 2D-TMDCs, their high oscillator strength, high charge mobility, and the potential for tuning, these materials have become a unique class of 2D materials for optoelectronic applications. Today, they are used for photodetection and light harvesting, phototransistors, and light-emitting diodes. The emission quantum yield of these materials depends on many factors, including fabrication techniques (mechanical exfoliation or chemical vapor deposition), type of substrate, defects, and so on. Typically, as-prepared 2D-TMDCs have a relatively low quantum yield of ~0.1%–10%. It has been shown that such low values of the quantum yield can be significantly improved by coupling to specifically tailored resonant optical nanocavities and metasurfaces. All of this makes 2D-TMDCs up-and-coming candidates for modern optoelectronics and photonics applications.
The Special Issue of the journal of Applied Sciences, “Transition Metal Dichalcogenides: Synthesis and Application”, aims to cover the recent research progress in the areas of 2D TMDC materials fabrication, and advanced optoelectronics and photonics applications.
Prof. Dr. Alex Krasnok
Guest Editor
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Keywords
- 2D transition metal dichalcogenides
- Excitonic resonances
- Strong light–matter interaction
- Emission quantum yield
- Strong coupling
- Purcell effect
- Nanoantennas
- Metasurfaces
- Photonics
- Optoelectronics
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