Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors

By Thomas Mueller, E. Malic. npj 2D Materials and Applications, 2018

860 citations recorded by the source corpus.

Two-dimensional group-VI transition metal dichalcogenide semiconductors, such as MoS2, WSe2, and others, exhibit strong light-matter coupling and possess direct band gaps in the infrared and visible spectral regimes, making them potentially interesting candidates for various applications in optics and optoelectronics. Here, we review their optical and optoelectronic properties with emphasis on exciton physics and devices. As excitons are tightly bound in these materials and dominate the optical response even at room-temperature, their properties are examined in depth in the first part of this article. We discuss the remarkably versatile excitonic landscape, including bright, dark, localized and interlayer excitons. In the second part, we provide an overview on the progress in optoelectronic device applications, such as electrically driven light emitters, photovoltaic solar cells, photodetectors, and opto-valleytronic devices, again bearing in mind the prominent role of excitonic effects. We conclude with a brief discussion on challenges that remain to be addressed to exploit the full potential of transition metal dichalcogenide semiconductors in possible exciton-based applications.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/634549fe483890c3e39c391492bbaf13595cbf0e

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In Electronic, Optical and Magnetic Materials

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Citations in the corpus

Broadband optical properties of monolayer and bulk MoS2 (2020, methodology): “The ellipsometry data for monolayer MoS2 samples were analyzed as follows: (1) In this step, the number of layers is set.”
WSe 2 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications (2020, background): “…these 2D crystals is shown in Figure 1A. 28-30 The emergence of semiconducting TMDC materials have enlightened the conventional semiconductor physics including transistors, 31-33 photodetectors 34-39 and light-emitting diodes 40 as well as quantum physics, that is, exciton physics 41 and photonics.”
Low-loss composite photonic platform based on 2D semiconductor monolayers (2019, background): “The phase change is expected to be especially strong in direct bandgap 2D materials compared to their bulk counterparts, since the weak dielectric screening of monolayer TMDs result in enhanced coulombic interactions and strong exciton binding energy [37], [38].”